WO2024065574A1 - 调节显示模组的伽马电压的方法 - Google Patents

调节显示模组的伽马电压的方法 Download PDF

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Publication number
WO2024065574A1
WO2024065574A1 PCT/CN2022/123005 CN2022123005W WO2024065574A1 WO 2024065574 A1 WO2024065574 A1 WO 2024065574A1 CN 2022123005 W CN2022123005 W CN 2022123005W WO 2024065574 A1 WO2024065574 A1 WO 2024065574A1
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Prior art keywords
gamma
gamma voltage
basic
display module
refresh
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PCT/CN2022/123005
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English (en)
French (fr)
Inventor
张家祥
陈功
方远�
向炼
孔亚坤
傅晓亮
吴承龙
张斌
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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BOE Technology Group Co Ltd
Chengdu BOE Optoelectronics Technology Co Ltd
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Priority to CN202280003386.4A priority Critical patent/CN118119996A/zh
Priority to EP22960206.5A priority patent/EP4481721A4/en
Priority to US18/271,944 priority patent/US12272287B2/en
Priority to PCT/CN2022/123005 priority patent/WO2024065574A1/zh
Priority to JP2024540976A priority patent/JP2025530941A/ja
Publication of WO2024065574A1 publication Critical patent/WO2024065574A1/zh
Anticipated expiration legal-status Critical
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/2007—Display of intermediate tones
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0247—Flicker reduction other than flicker reduction circuits used for single beam cathode-ray tubes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0693—Calibration of display systems
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2340/00—Aspects of display data processing
    • G09G2340/04—Changes in size, position or resolution of an image
    • G09G2340/0407—Resolution change, inclusive of the use of different resolutions for different screen areas
    • G09G2340/0435—Change or adaptation of the frame rate of the video stream
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix

Definitions

  • the present disclosure relates to the field of display technology, and in particular, to a method for adjusting a gamma voltage of a display module and a corresponding display module.
  • LTPO Low-temperature polycrystalline oxide
  • the existing LTPO display module only performs gamma tuning (Gamma Tuning) in the refresh frame (high frequency), and borrows the gamma voltage of the refresh frame in the hold frame (low frequency), and reduces the difference in image quality under different frequencies by adjusting the relevant voltage of the hold frame.
  • gamma Tuning gamma tuning
  • the voltage settings of different grayscales at the same display brightness value (DBV) of the display module are the same, which causes different brightness differences between the high grayscale and the low grayscale of the display module during the frequency switching process, which causes flicker.
  • a display module with a stroboscopic defect When a display module with a stroboscopic defect is used in electronic devices that are commonly used in daily life and include display screens, it will affect the user's experience.
  • the stroboscopic display screen of an electronic device may also affect the health of the user. For example, if the human eye is exposed to low-frequency stroboscopic stimulation for a long time, it will cause eye muscle fatigue, causing discomfort to the eyes or even the body.
  • the present application proposes a gamma voltage adjustment method for improving the multi-frequency switching (VRR) effect of LTPO display modules, wherein different gamma voltages can be used according to different frequencies.
  • the method can effectively improve the VRR effect of different grayscales under the same DBV during frequency switching without occupying a large storage space of the IC and without increasing the gamma tuning time.
  • At least one embodiment of the present application provides a method for adjusting the gamma voltage of a display module, comprising: obtaining the gamma voltage of the display module at a basic refresh frequency; obtaining the correlation between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage at a target refresh frequency; and determining the gamma voltage of the display module at the target refresh frequency based on the gamma voltage of the display module at the basic refresh frequency and the correlation.
  • the association relationship corresponds to the display brightness value of the display module, and different display brightness values have corresponding association relationships therewith.
  • it also includes: determining a current display brightness value of the display module; wherein, obtaining the gamma voltage of the display module at the basic refresh frequency includes: obtaining the gamma voltage of the display module at the basic refresh frequency at the current display brightness value, and wherein, obtaining the correlation between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage at the target refresh frequency includes: obtaining the correlation between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage at the target refresh frequency at the current display brightness value.
  • the association relationship includes a proportional relationship
  • obtaining the association relationship between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage at the target refresh frequency at the current display brightness value includes: for each gray scale among multiple gray scales, obtaining the proportional relationship between the gamma voltage of the gray scale at the basic refresh frequency at the current display brightness value and the gamma voltage of the gray scale at the target refresh frequency.
  • the proportional relationship is a gamma ratio
  • the proportional relationship between the gamma voltage of the grayscale of the display module at the basic refresh frequency under the current display brightness value and the gamma voltage of the grayscale at the target refresh frequency is obtained, including: obtaining the gamma ratio of at least two specific grayscales among multiple grayscales, wherein the gamma ratio indicates the ratio between the gamma voltage of the grayscale of the display module at the basic refresh frequency under the current display brightness value and the gamma voltage of the corresponding grayscale at the target refresh frequency; and interpolating based on the gamma ratios of at least two specific grayscales to obtain the gamma ratio of each grayscale among the multiple grayscales.
  • the proportional relationship is a gamma ratio
  • the proportional relationship between the gamma voltage of the grayscale at the basic refresh frequency under the current display brightness value and the gamma voltage of the grayscale at the target refresh frequency is obtained, including: for each grayscale among multiple grayscales, among the basic refresh frequency and multiple non-basic refresh frequencies, at least two non-basic refresh frequencies close to the target refresh frequency are determined; for each non-basic refresh frequency among the at least two non-basic refresh frequencies, the gamma ratio of the non-basic refresh frequency is obtained, wherein the gamma ratio indicates the ratio between the gamma voltage of the grayscale of the display module at the basic refresh frequency under the current display brightness value and the gamma voltage of the corresponding grayscale at the non-basic refresh frequency; and interpolation is performed based on the gamma ratio of each non-basic refresh frequency among the at least two non-basic refresh frequencies to obtain the gamm
  • the gamma voltage of the display module at a target refresh frequency is determined based on the gamma voltage of the display module at a basic refresh frequency and an associated relationship, including: under the current display brightness value of the display module, for each of a plurality of gray scales, determining the gamma voltage of the gray scale at the target refresh frequency based on the product of the gamma voltage of the gray scale at the basic refresh frequency and the proportional relationship between the gamma voltage of the gray scale at the basic refresh frequency and the gamma voltage of the gray scale at the target refresh frequency.
  • the association relationship includes a polynomial relationship
  • obtaining the association relationship between the gamma voltage of the display module at the basic refresh frequency and the gamma voltage at the target refresh frequency at the current display brightness value includes: obtaining multiple coefficients of a polynomial for characterizing a voltage relationship curve between the gamma voltage of each gray scale of the display module at the basic refresh frequency at the current display brightness value and the gamma voltage of each corresponding gray scale at the target refresh frequency.
  • the gamma voltage of the display module at the target refresh frequency is determined based on the gamma voltage of the display module at the basic refresh frequency and the associated relationship, including: under the current display brightness value of the display module, based on the gamma voltage of each gray scale in multiple gray scales at the basic refresh frequency and multiple coefficients, determining the gamma voltage of each gray scale at the target refresh frequency.
  • At least one embodiment of the present application provides a method for determining the correlation between the gamma voltages of a display module, comprising: measuring the gamma voltage of the display module at a basic refresh frequency; measuring the gamma voltage of the display module at one or more non-basic refresh frequencies; and determining the correlation between the gamma voltages of the display module based on the gamma voltage of the display module at the basic refresh frequency and the gamma voltage at one or more non-basic refresh frequencies.
  • the association relationship corresponds to the display brightness value of the display module, and different display brightness values have corresponding association relationships therewith.
  • measuring the gamma voltage of the display module at the basic refresh frequency includes: measuring the gamma voltage of multiple grayscales of the display module at the basic refresh frequency under the current display brightness value
  • measuring the gamma voltage of the display module at one or more non-basic refresh frequencies includes: for each non-basic refresh frequency of one or more non-basic refresh frequencies, measuring the gamma voltage of multiple grayscales of the display module at the non-basic refresh frequency under the current display brightness value.
  • the association relationship includes a proportional relationship
  • determining the association relationship between the gamma voltages of the display module based on the gamma voltages of the display module at a basic refresh frequency and the gamma voltages at one or more non-basic refresh frequencies includes: for each of the one or more non-basic refresh frequencies, determining a gamma ratio indicating the ratio between the gamma voltages of multiple gray levels at the basic refresh frequency and the gamma voltages of each corresponding gray level at the non-basic refresh frequency at a current display brightness value.
  • the association relationship includes a proportional relationship
  • determining the association relationship between the gamma voltages of the display module based on the gamma voltages of the display module at a basic refresh frequency and the gamma voltages at one or more non-basic refresh frequencies includes: for each gray scale among multiple gray scales, determining a gamma ratio indicating the ratio between the gamma voltage of the gray scale at the basic refresh frequency and the gamma voltage of the gray scale at one or more non-basic refresh frequencies at a current display brightness value.
  • the association relationship includes a polynomial relationship
  • determining the relationship between the gamma voltage of each of a plurality of grayscales at a basic refresh frequency at a current display brightness value and the gamma voltage of each of a plurality of grayscales at one or more non-basic refresh frequencies includes: determining a plurality of coefficients of a polynomial for characterizing a voltage relationship curve between the gamma voltages of a plurality of grayscales of a display module at a basic refresh frequency at a current display brightness value and the gamma voltages of a plurality of corresponding grayscales at one or more non-basic refresh frequencies.
  • At least one embodiment of the present application provides a display device, which includes a memory and a processor coupled to the memory, and the processor is configured to: obtain a gamma voltage of the display device at a basic refresh frequency; obtain an association relationship between the gamma voltage of the display device at the basic refresh frequency and the gamma voltage at a target refresh frequency; and determine the gamma voltage of the display device at the target refresh frequency based on the gamma voltage of the display device at the basic refresh frequency and the association relationship.
  • FIG1A is a timing diagram of an LTPO display module driven by a low refresh rate
  • FIG1B is a schematic diagram showing the difference in brightness of different grayscales of an LTPO display module at high refresh rates and low refresh rates;
  • FIG1C is a measured diagram of the brightness difference of different grayscales of the LTPO module at high refresh rate and low refresh rate;
  • FIG. 2 is a schematic diagram of a method for storing gamma voltages of various grayscales at different refresh frequencies under different DBVs;
  • FIG3 is a flow chart of a method for adjusting the gamma voltage of an LTPO display module to improve VRR effect according to an embodiment of the present disclosure
  • FIG. 4A is a schematic diagram showing a proportional relationship between a gamma voltage of a grayscale at a non-basic refresh frequency and a gamma voltage of a corresponding grayscale at a basic refresh frequency under the same DBV according to an embodiment of the present disclosure
  • FIG. 4B is a schematic diagram showing a method for determining gamma voltages of various grayscales at a non-basic refresh frequency using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure
  • FIG. 4C is a schematic diagram showing another method for determining the gamma voltages of each gray scale at a non-basic refresh frequency by using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure
  • FIG. 5 is a schematic diagram of a relationship between differences between gamma voltages of different gray scales at a non-basic refresh rate and gamma voltages of different gray scales at a basic refresh rate according to an embodiment of the present disclosure
  • FIG. 6 is a flowchart of a method for determining an association relationship between gamma voltages of each gray scale at a basic refresh rate and gamma voltages of each gray scale at a non-basic refresh rate according to an embodiment of the present disclosure
  • FIGS. 7A and 7B are schematic diagrams of a method for determining a proportional relationship between gamma voltages of each gray scale at a basic refresh frequency and gamma voltages of each gray scale at a non-basic refresh frequency according to an embodiment of the present disclosure
  • FIG8A is a display device implementing the method for adjusting the gamma voltage of the LTPO display module according to an embodiment of the present disclosure
  • FIG8B is a display device implementing the method for adjusting the gamma voltage of the LTPO display module according to an embodiment of the present disclosure.
  • FIG. 9 is a diagram showing the measured effect of applying the method for adjusting the gamma voltage of the LTPO display module according to an embodiment of the present disclosure to improve the VRR effect.
  • Words such as “include” or “comprise” and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.
  • Words such as “connect” or “connected” and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up”, “down”, “left”, “right” and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
  • Figure 1A is a timing diagram of an LTPO display module driven by a low refresh frequency.
  • the LTPO display module can be driven with a combination of a refresh frame and a hold frame.
  • a refresh frame refers to a frame in which pixel data is updated
  • a hold frame refers to a frame in which pixel data is not updated (i.e., only held).
  • the reference frequency i.e., the basic refresh frequency
  • one cycle can include 1 refresh frame and 11 hold frames.
  • TE-sync is a frame synchronization signal
  • TE-test indicates a refresh frame
  • the GOA signal indicates an action switch.
  • Figure 1B is a schematic diagram showing the brightness difference of different grayscales of the LTPO display module at high refresh rate and low refresh rate.
  • high refresh rate refers to a refresh rate higher than 80Hz
  • low refresh rate refers to a refresh rate lower than 60Hz.
  • the data voltage Data(n) is updated, the source voltage of the transistor T2 (as shown in the figure at node N3) is refreshed, and Gate-N(n) turns on the transistor T2 to write the data voltage to the capacitor Cst ; in the hold frame, the data voltage Data(n) is not updated, and Gate-N(n) turns off the transistor T2 and does not write the data voltage to CST.
  • the voltage of the node N3 is different between the refresh frame and the hold frame.
  • the voltage of the node N3 is higher in the hold frame, causing the transistor T6 to turn on in advance to precharge the node N4, so that the voltage of the node N4 becomes higher in the hold frame, resulting in a brightness difference between the LTPO display module and the hold frame. Therefore, if the source voltage does not change during the refresh frequency switching process, the difference between the voltages of the nodes N3 and N4 in the refresh frame and the hold frame will cause the screen flickering at a low refresh frequency and the screen flickering during the switching process between the high refresh frequency and the low refresh frequency.
  • EM(n) is a light emitting control signal and is provided to the gates of transistors T5 and T6
  • Reset_N(n) is a reset signal
  • Gate-P(n) is a gate control signal of transistors T4 and T7
  • node N1 is connected to the gate of transistor T3
  • Vinit1 and Vinit2 are initial setting signals.
  • Figure 1C is a measured graph of the brightness difference of different grayscales of the LTPO module at high refresh rates and low refresh rates. As shown in Figure 1C, there is a brightness difference between different grayscales at a refresh rate of 120Hz and a refresh rate of 10Hz at the same DBV, where the horizontal axis is the grayscale and the vertical axis is the brightness difference. Specifically, as the grayscale gradually increases, the brightness difference between the grayscales at 120Hz and 10Hz gradually decreases.
  • the pixel circuit of the LTPO display module will generate a certain disturbance current ⁇ I.
  • the brightness of the high grayscale is higher, and the current I1 is larger, while the brightness of the low grayscale is lower, and the current I2 is smaller, that is, I1>I2.
  • the impact of the disturbance current ⁇ I on high and low grayscales is ⁇ I/I1 ⁇ I/I2, that is, the disturbance current has a smaller impact on high grayscale and a greater impact on low grayscale. Therefore, when the refresh frequency is switched under the same DBV, there will be a large difference in brightness and color between high grayscale and low grayscale.
  • the driving voltages of different nodes are consistent except for the source voltages of different grayscales under the same DBV.
  • this driving method cannot meet the requirement of smaller brightness and chromaticity differences for both high and low grayscales when switching the refresh rate under the same DBV. Reducing the difference in voltage of node N4 between high refresh rate and low refresh rate is an effective way to improve the brightness difference of different grayscales when switching the refresh rate under the same DBV.
  • Applying different gamma voltages for different grayscales at different refresh frequencies can change the voltages of high grayscale and low grayscale at node N4, thereby changing the difference in the voltage at point N4 between high refresh frequency and low refresh frequency, thereby improving the brightness difference between high grayscale and low grayscale during the refresh frequency switching process at the same DBV.
  • gamma voltages of different grayscales at different refresh frequencies under different DBVs can be stored, and the gamma voltages can be read when needed according to actual usage.
  • FIG2 shows a schematic diagram of a method for storing gamma voltages of various grayscales at different refresh frequencies under different DBVs. Specifically, gamma tuning is performed at different refresh frequencies for different DBVs, gamma voltages of different grayscales at different refresh frequencies under different DBVs are determined, and the determined gamma voltages are stored in a chip IC.
  • the LTPO display module switches from a current refresh frequency to another refresh frequency at a certain DBV
  • the stored gamma voltages of various grayscales at the other refresh frequency are read from the IC and applied to improve the VRR effect during the switch from the current refresh frequency to another refresh frequency.
  • the IC may store gamma voltages of multiple grayscales at multiple different refresh rates corresponding to multiple DBVs.
  • the gamma voltages of different grayscales at a refresh rate of 30 Hz corresponding to the current DBV of the LTPO display module may be read from the IC and the multiple gamma voltages read may be applied.
  • the brightness difference of different grayscales at the same DBV during the refresh frequency switching process can be effectively improved, thereby effectively improving the picture quality of the LTPO display module and improving the VRR effect of the LTPO display module.
  • the LTPO display module needs to switch between multiple refresh frequencies, if gamma tuning is performed for each refresh frequency, a lot of gamma tuning time is required, and additional storage space must be added to the IC to store related data, such as gamma voltages of different grayscales at different refresh frequencies obtained through gamma tuning, which will greatly increase the manufacturing cost of the LTPO display module. Therefore, it is necessary to find an effective and reasonable method to solve the problem of gamma tuning of multiple refresh frequencies and related data storage.
  • the present disclosure proposes an adjustment method for optimizing the VRR effect of an LTPO display module, which can use different gamma voltages for different grayscales at different refresh frequencies, while not occupying a large storage space of the IC and not requiring too much gamma tuning time.
  • This method can effectively improve the VRR effect of different grayscales when the refresh frequency is switched under the same DBV, by balancing the voltage change of the node N4 of the pixel circuit between the high grayscale and the low grayscale, thereby effectively reducing the brightness difference between the high grayscale and the low grayscale between the refresh frame and the hold frame.
  • FIG. 3 is a flow chart of a method for adjusting the gamma voltage of an LTPO display module to improve VRR effect according to an embodiment of the present disclosure.
  • the gamma voltage of each grayscale of the LTPO display module at the basic refresh frequency is obtained.
  • the LTPO display module may have multiple different DBVs, and multiple grayscales at different refresh frequencies under different DBVs have different gamma voltages.
  • the gamma voltage of each grayscale of the LTPO display module at the basic refresh frequency under different DBVs is stored in the IC.
  • the current DBV of the LTPO display module is first determined, and then the gamma voltage of each grayscale at the basic refresh frequency corresponding to the current DBV is obtained from the IC.
  • a correlation relationship between the gamma voltages of each gray scale at a basic refresh rate and the gamma voltages of each gray scale at a target refresh rate of the LTPO display module is obtained.
  • the association relationship may be a proportional relationship.
  • the proportional relationship may represent the proportional relationship between the gamma voltage of the grayscale at the basic refresh frequency and the gamma voltage of the grayscale at the non-basic refresh frequency under the same DBV.
  • the association relationship may be a polynomial relationship.
  • the polynomial relationship may represent the difference between the gamma voltage of the grayscale at the base refresh frequency and the gamma voltage of the grayscale at the non-base refresh frequency under the same DBV.
  • the gamma voltages of the various gray scales at the target refresh frequency are determined based on the gamma voltages of the various gray scales at the basic refresh frequency and the association relationship.
  • the gamma voltage of each gray scale at the target refresh rate may be a product of the gamma voltage of each gray scale at the basic refresh rate and the gamma ratio.
  • FIG. 4A is a schematic diagram showing a proportional relationship between the gamma voltage of a grayscale at a non-basic refresh frequency and the gamma voltage of a corresponding grayscale at a basic refresh frequency under the same DBV according to an embodiment of the present disclosure.
  • the proportional relationship can be represented by the following equation:
  • y represents the gamma voltage of different grayscales at the basic refresh frequency
  • Y represents the gamma voltage of the corresponding grayscale at the non-basic refresh frequency
  • ⁇ represents the ratio between the gamma voltage of different grayscales at the basic refresh frequency and the gamma voltage of the corresponding grayscale at the target refresh frequency, that is, the gamma ratio.
  • the gamma voltage of a grayscale under the basic refresh frequency of 120 Hz under the same DBV is gamma 1
  • the gamma ratio between the gamma voltage of the grayscale under the non-basic refresh frequency 1 of 60 Hz and the gamma voltage of the grayscale under the basic refresh frequency of 120 Hz is gamma ratio 1
  • the gamma ratio between the gamma voltage of the grayscale under the non-basic refresh frequency 2 of 30 Hz and the gamma voltage of the grayscale under the basic refresh frequency of 120 Hz is gamma ratio 2
  • the gamma ratio between the gamma voltage of the grayscale under the non-basic refresh frequency 3 of 10 Hz and the gamma voltage of the grayscale under the basic refresh frequency of 120 Hz is gamma ratio 3
  • FIG. 4B is a schematic diagram showing a method for determining gamma voltages of various grayscales at a non-basic refresh frequency by using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure.
  • the horizontal axis represents the gamma ratio and the vertical axis represents the gamma voltage.
  • the same gray scale has different gamma ratios.
  • the current DBV of the LTPO display module is first determined, and then the gamma voltage of the grayscale at the basic refresh frequency and the gamma ratio of multiple binding point grayscales at the target refresh frequency under the current DBV stored in the IC are obtained, and the gamma ratio corresponding to the non-binding point grayscale is obtained by linear interpolation, and the gamma voltage of multiple grayscales at the target refresh frequency is determined by multiplying the gamma voltages of multiple grayscales at the basic refresh frequency and the gamma ratios of the corresponding grayscales obtained by the interpolation operation.
  • a non-basic refresh frequency i.e., a target refresh frequency
  • the current refresh rate of the LTPO display module is 120Hz, and the target refresh rate is 30Hz.
  • determine the current DBV of the LTPO display module and obtain the gamma ratio of the tie point grayscale at a refresh rate of 30Hz corresponding to the current DBV stored in the IC.
  • the tie point grayscale can be 0, 16, 32, 64, 128 and 255, that is, the gamma ratios of these grayscales can be obtained.
  • the gamma ratios of non-tie point grayscales that are not stored in the IC they can be obtained by linear interpolation.
  • the gamma ratio of tie point grayscale 0 is gamma ratio 1
  • the gamma ratio of tie point grayscale 16 is gamma ratio 2
  • the gamma ratios of other grayscales between grayscale 0 and grayscale 16 can be obtained by linear interpolation.
  • the gamma ratio of grayscale 4 can be calculated by the following equation:
  • gamma ratio represents the gamma ratio
  • gamma ratio1 represents the gamma ratio 1
  • gamma ratio2 represents the gamma ratio 2.
  • the gamma ratios of other non-bound point grayscales can also be obtained by linear interpolation in this way.
  • the gamma voltage of grayscale 0 at the base refresh frequency is gamma1
  • the gamma ratio of grayscale 0 at the target refresh frequency is gamma ratio 1
  • the gamma voltage of grayscale 0 at the target refresh frequency is gamma ratio 1 ⁇ gamma1.
  • FIG. 4C is a schematic diagram showing another method for determining the gamma voltages of each gray scale at a non-basic refresh frequency by using the proportional relationship of FIG. 4A according to an embodiment of the present disclosure.
  • the horizontal axis represents the gray scale
  • the vertical axis represents the gamma ratio.
  • different gray scales have different gamma ratios.
  • the LTPO display module when the LTPO display module is to switch to a non-basic refresh frequency, that is, a target refresh frequency, if the gamma ratio corresponding to the target refresh frequency has been stored in the IC (that is, the target refresh frequency is one of several tie point non-basic refresh frequencies), the stored gamma ratio can be directly called to determine the gamma voltage of the grayscale at the target refresh frequency.
  • the current DBV of the LTPO display module is first determined, and then the gamma voltage of the grayscale at the basic refresh frequency under the current DBV and the gamma ratio corresponding to the target refresh frequency stored in the IC can be directly obtained, and the gamma voltage of the grayscale at the target refresh frequency is determined by multiplying the gamma voltage of the grayscale at the basic refresh frequency and the gamma ratio.
  • the gamma ratios of grayscale at refresh rates of 10Hz, 30Hz, 60Hz, and 90Hz under different DBVs are stored in the IC
  • the current refresh rate of the LTPO display module is 120Hz
  • the target refresh rate is 30Hz. Because the gamma ratios of grayscale at a refresh rate of 30Hz under different DBVs have been stored in the IC, the gamma ratios can be directly obtained and the corresponding gamma voltages can be calculated.
  • a linear interpolation operation can be used to obtain the gamma ratio corresponding to the target refresh frequency to determine the gamma voltage of the grayscale at the target refresh frequency.
  • the current DBV of the LTPO display module is first determined, and then the gamma voltage of the grayscale at the basic refresh frequency under the current DBV and the gamma ratios corresponding to several tie-point non-basic refresh frequencies stored in the DC can be obtained, the gamma ratio corresponding to the target refresh frequency is obtained by linear interpolation, and the gamma voltage of the grayscale at the target refresh frequency is determined by multiplying the gamma voltage of the grayscale at the basic refresh frequency and the gamma ratio obtained by the interpolation operation.
  • the gamma ratios of grayscale at refresh rates of 10 Hz, 30 Hz, 60 Hz, and 90 Hz under different DBVs are stored in the IC
  • the current refresh rate of the LTPO display module is 120 Hz
  • the target refresh rate is 50 Hz. Because the gamma ratios of grayscale at a refresh rate of 50 Hz under different DBVs are not stored in the IC, linear interpolation is required to obtain the gamma voltage of the grayscale at a refresh rate of 50 Hz.
  • the gamma ratio of the grayscale at a refresh rate of 30 Hz is a gamma ratio of 3
  • the gamma ratio of the grayscale at a refresh rate of 60 Hz is a gamma ratio of 4
  • the gamma voltage of the corresponding grayscale at a refresh rate of 50 Hz can be calculated by the following equation:
  • gamma ratio represents the gamma ratio
  • gamma ratio3 represents the gamma ratio 3
  • gamma ratio4 represents the gamma ratio 4.
  • FIG. 5 is a schematic diagram illustrating a relationship between differences between gamma voltages of different gray scales at a non-basic refresh frequency and gamma voltages of different gray scales at a basic refresh frequency according to an embodiment of the present disclosure.
  • ⁇ y represents the difference between the gamma voltages of different grayscales at the basic refresh rate and the gamma voltages of different grayscales at the non-basic refresh rate
  • x represents the grayscale
  • a, b, and c are coefficients of the polynomial, respectively.
  • the coefficients a, b, c of the polynomial at refresh frequencies of 10 Hz, 30 Hz, 60 Hz, and 90 Hz are stored in the IC, respectively.
  • the current refresh frequency of the LTPO display module is 120 Hz
  • the coefficients a, b, c of the polynomial at refresh frequencies of 10 Hz, 30 Hz, 60 Hz, and 90 Hz are stored in the IC, respectively.
  • the current refresh frequency of the LTPO display module is 120 Hz
  • the target refresh frequency is 50 Hz. Because the coefficients a, b, c of the polynomial at the target refresh frequency of 50 Hz are not stored in the IC, linear interpolation is required to obtain the coefficients a, b, c of the polynomial at the refresh frequency of 50 Hz.
  • the coefficients a1, b1, c1 of the polynomial at a refresh frequency of 30 Hz and the coefficients a2, b2, c2 of the polynomial at a refresh frequency of 60 Hz.
  • the coefficient a3 of the polynomial at the target refresh frequency of 50 Hz can be calculated by the following equation:
  • the coefficients b3 and c3 of the polynomial at a target refresh rate of 50 Hz can be calculated as and
  • FIG. 6 is a flowchart of a method for determining an association relationship between gamma voltages of each gray scale at a basic refresh frequency and gamma voltages of each gray scale at a non-basic refresh frequency according to an embodiment of the present disclosure.
  • the gamma voltage of each grayscale of the LTPO display module at the basic refresh frequency is measured.
  • the LTPO display module may have multiple different DBVs, and multiple grayscales at different refresh frequencies under different DBVs have different gamma voltages. Specifically, for different DBVs, gamma tuning is performed at the basic refresh frequency to obtain the gamma voltage of each grayscale at the basic refresh frequency under different DBVs.
  • the gamma voltage of each gray scale of the LTPO display module at one or more non-basic refresh frequencies is measured. Specifically, for each of the one or more non-basic refresh frequencies, gamma tuning is performed at the non-basic refresh frequency at different DBVs to obtain the gamma voltage of each gray scale at the non-basic refresh frequency at different DBVs.
  • a correlation relationship between gamma voltages of the display module is determined based on gamma voltages of each grayscale of the LTPO display module at a basic refresh rate and gamma voltages of corresponding grayscales at one or more non-basic refresh rates.
  • the difference between the gamma voltage of each grayscale at the basic refresh frequency and the gamma voltage of the corresponding grayscale at the non-basic refresh frequency conforms to a polynomial relationship.
  • FIGS. 7A and 7B are schematic diagrams of a method for determining a proportional relationship between gamma voltages of each gray scale at a basic refresh frequency and gamma voltages of each gray scale at one or more non-basic refresh frequencies according to an embodiment of the present disclosure.
  • FIG. 7A is a schematic diagram showing a proportional relationship between a gamma voltage of each grayscale at a basic refresh frequency and a gamma voltage of a corresponding grayscale at the non-basic refresh frequency under the same DBV for each non-basic refresh frequency among one or more non-basic refresh frequencies.
  • gamma tuning is performed at a base refresh frequency to determine a gamma voltage of a plurality of grayscales at the base refresh frequency under the DBV.
  • gamma tuning is performed at the non-base refresh frequency to determine a gamma voltage of a corresponding grayscale at the non-base refresh frequency under the DBV.
  • a proportional relationship between a gamma voltage of each grayscale at the base refresh frequency and a gamma voltage of a corresponding grayscale at the non-base refresh frequency is determined.
  • the proportional relationship can be characterized by the following equation:
  • y represents the gamma voltage of different grayscales at the basic refresh frequency
  • Y represents the gamma voltage of the corresponding grayscale at the non-basic refresh frequency
  • ⁇ represents the ratio between the gamma voltage of different grayscales at the basic refresh frequency and the gamma voltage of the corresponding grayscale at the non-basic refresh frequency, that is, the gamma ratio.
  • the LTPO display module can have multiple different DBVs and can switch between multiple different refresh frequencies, a large amount of storage space will be required if the gamma ratios of each grayscale at different refresh frequencies under different DBVs are stored in the IC.
  • the base refresh frequency is 120 Hz
  • one of the one or more non-base refresh frequencies is 30 Hz.
  • the tie point for the non-base refresh frequency of 30 Hz can be determined as follows: gamma tuning is performed at the base refresh frequency of 120 Hz to determine the gamma voltages gamma 120 0, gamma 120 1, ..., gamma 120 255 of each gray scale at 120 Hz; gamma tuning is performed at the non-base refresh frequency of 30 Hz at the same DBV to determine the gamma voltages gamma 30 0, gamma 30 1, ..., gamma 30 255 of the corresponding gray scale at 30 Hz; and the gamma ratios 0, gamma ratios 1, ..., gamma ratios 255 between the gamma voltages of each gray scale at 30 Hz and the gamma voltages of the corresponding gray scale at 120 Hz are calculated.
  • the tie point gray scale is selected from the plurality of gray scales so that the gamma ratios of the tie point gray scales can be characterized by a piecewise linear function.
  • the points on the linear function determined by gamma ratio 0 and gamma ratio 15 can better cover gamma ratio 1 to gamma ratio 14. Therefore, grayscales 0 and 15 corresponding to gamma ratio 0 and gamma ratio 15 can be selected as tie point grayscales. In this way, other tie point grayscales at 30Hz can be determined. Tie point grayscales at other non-basic refresh frequencies can also be determined in a similar manner.
  • 7B is a schematic diagram showing a proportional relationship between a gamma voltage of each gray scale at a basic refresh rate and a gamma voltage of the gray scale at one or more non-basic refresh rates under the same DBV for each gray scale.
  • gamma tuning is performed at the base refresh frequency to determine the gamma voltages of multiple grayscales at the base refresh frequency under the DBV.
  • different gamma voltages are provided at different non-base refresh frequencies under the same DBV.
  • a proportional relationship between the gamma voltage of the grayscale at the base refresh frequency and the gamma voltage of the grayscale at one or more non-base refresh frequencies is determined.
  • the proportional relationship can also be characterized by the following equation:
  • y represents the gamma voltage of the grayscale at the basic refresh frequency
  • Y represents the gamma voltage of the grayscale at one or more non-basic refresh frequencies
  • ⁇ represents the ratio between the gamma voltage of the grayscale at the basic refresh frequency and the gamma voltage of the grayscale at one or more non-basic refresh frequencies, that is, the gamma ratio.
  • the LTPO display module can have multiple different DBVs and can switch between multiple different refresh frequencies, a large amount of storage space will be required if the gamma ratios of each grayscale at different refresh frequencies under different DBVs are stored in the IC.
  • the gamma ratio of the grayscale at several specific non-basic refresh frequencies in one or more non-basic refresh frequencies can be stored in the IC.
  • the several specific non-basic refresh frequencies from the one or more non-basic refresh frequencies can be called the binding points of the non-basic refresh frequencies, and the several specific non-basic refresh frequencies can be called the non-basic refresh frequency binding points.
  • the basic refresh frequency is 120 Hz
  • the multiple non-basic refresh frequencies may include 5 Hz, 10 Hz, 15 Hz, ..., 105 Hz, 110 Hz and 115 Hz.
  • the binding point non-basic refresh frequencies of multiple non-basic refresh frequencies can be determined as follows: gamma tuning is performed at a basic refresh frequency of 120 Hz to determine the gamma voltages gamma 120 0, gamma 120 1, ..., gamma 120 255 of each grayscale at 120 Hz, wherein the gamma voltage of grayscale 128 is gamma 120 128; under the same DBV, gamma tuning is performed at 5 Hz, 10 Hz, 15 Hz, ..., 105 Hz, 110 Hz and 115 Hz respectively, and the gamma voltages of each grayscale at multiple non-basic refresh frequencies have been determined, wherein the gamma voltages of grayscale 128 at multiple non-basic refresh
  • the points on the linear function determined by the gamma ratio 10 128 and the gamma ratio 30 128 can better cover the gamma ratio of grayscale 128 at each non-basic refresh frequency between the gamma ratio 10 128 and the gamma ratio 30 128. Therefore, the non-basic refresh frequencies 10 Hz and 30 Hz corresponding to the gamma ratio 10 128 and the gamma ratio 30 128 can be selected as the tie point non-basic refresh frequencies.
  • an interpolation polynomial relationship can be established between the gamma voltages of different gray scales at a basic refresh frequency and the gamma voltages of different gray scales at a non-basic refresh frequency, and the gamma voltages of different gray scales at a non-basic refresh frequency can be determined based on the established polynomial relationship.
  • Gamma tuning is performed at the basic refresh frequency and the non-basic refresh frequency respectively to determine the gamma voltage of different grayscales at the basic refresh frequency and the gamma voltage of different grayscales at the non-basic refresh frequency and calculate the difference ⁇ y between them.
  • Each pixel on the LTPO display module is a combination of red (R), green (G), and blue (B) components at different brightness levels, that is, the color change of each pixel on the screen is caused by the grayscale change of the three RGB sub-pixels that constitute the pixel. Therefore, the difference ⁇ y on the R component, G component, and B component can be calculated separately.
  • the graph on the left side of Figure 5A shows the difference between the gamma voltage of the R component of different grayscales at a basic refresh frequency of 120Hz under different DBVs (DBV1, DBV2, DBV3) and the gamma voltage of the R component of the corresponding grayscale at a non-basic refresh frequency of 30Hz;
  • the middle graph shows the difference between the gamma voltage of the G component of different grayscales at 120Hz under different DBVs and the gamma voltage of the G component of different grayscales at 30Hz;
  • the graph on the right side shows the difference between the gamma voltage of the B component of different grayscales at 120Hz under different DBVs and the gamma voltage of the B component of different grayscales at 30Hz.
  • ⁇ y represents the difference between the gamma voltages of different grayscales at the basic refresh rate and the gamma voltages of different grayscales at the non-basic refresh rate
  • x represents the grayscale
  • a, b, and c are coefficients of the polynomial, respectively.
  • the established polynomial relationship and the corresponding polynomial coefficients may be pre-stored in the IC.
  • the gamma voltages of different grayscales at the basic refresh rate of 120 Hz may also be pre-stored in the IC.
  • y represents the gamma voltage of different gray scales at the basic refresh frequency
  • Y represents the gamma voltage of the corresponding gray scale at the non-basic refresh frequency
  • the polynomial coefficients of multiple non-basic refresh frequencies can be tied and the tied point coefficients can be stored in the IC, wherein the multiple tied point coefficients can be represented by a piecewise linear function.
  • the polynomial coefficients a, b, and c of multiple non-basic refresh frequencies can be determined respectively and multiple coefficients can be selected from them for binding points.
  • coefficient a as an example, firstly, multiple coefficients a1, a2, ..., a20 of multiple non-basic refresh frequencies are obtained.
  • the multiple coefficients a1, a2, ..., a6 are obtained.
  • the points on the linear function determined by a1 and a5 can better cover the coefficients a between a1 and a5, so a1 and a5 can be selected as the tie point coefficients a. Similarly, several other tie point coefficients a can be determined in the same way.
  • FIG. 8A is a display device that implements the method for adjusting the gamma voltage of the LTPO display module according to an embodiment of the present disclosure.
  • the display device includes a memory and a processor coupled to the memory, and the processor is configured to: obtain a gamma voltage of the display device at a basic refresh frequency; obtain a correlation between the gamma voltage of the display device at the basic refresh frequency and the gamma voltage at a target refresh frequency; and determine the gamma voltage of the display device at the target refresh frequency based on the gamma voltage of the display device at the basic refresh frequency and the correlation.
  • FIG. 8B is a display device that implements the method of adjusting the gamma voltage of the LTPO display module according to an embodiment of the present disclosure.
  • the display device includes a storage part, an acquisition part, and a gamma voltage determination part.
  • the storage component is configured to store a gamma voltage of the display device at a basic refresh frequency and an associated relationship between the gamma voltage of the display device at the basic refresh frequency and the gamma voltage at a target basic refresh frequency.
  • the acquisition component is configured to acquire the gamma voltage of the display device at the basic refresh rate and the association relationship between the gamma voltage of the display device at the basic refresh rate and the gamma voltage at the target basic refresh rate stored in the storage component.
  • the gamma voltage determining component is configured to determine the gamma voltage of the display device at the target basic refresh frequency based on the acquired gamma voltage of the display device at the basic refresh frequency and the associated relationship.
  • FIG9 is a diagram of the measured effect of applying the method for adjusting the gamma voltage of the LTPO display module according to an embodiment of the present disclosure to improve the VRR effect.
  • FIG9 shows the gamma curves at different refresh frequencies under different DBVs.
  • the figure on the left side of FIG9 shows the gamma curves at different refresh frequencies (120Hz, 60Hz, 30Hz, and 10Hz) when the DBV is 500 nits; the figure in the middle shows the gamma curves at different refresh frequencies (120Hz, 60Hz, 30Hz, and 10Hz) when the DBV is 80 nits; and the figure on the right side shows the gamma curves at different refresh frequencies (120Hz, 60Hz, 30Hz, and 10Hz) when the DBV is 25 nits.
  • nits is the unit of brightness, nits.

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Abstract

一种用于调节显示模组的伽马电压的方法，包括：获得该显示模组在基础刷新频率下的伽马电压，获得该显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系，并且基于该显示模组在基础刷新频率下的伽马电压和该关联关系来确定该显示模组在目标刷新频率下的伽马电压。该调节方法实现了根据不同的刷新频率来采用不同的伽马电压，在不占用集成电路芯片较大的存储空间并且可以不增加伽马调谐的时间的情况下有效改善相同显示亮度值下不同灰阶在频率切换过程中的多频切换效果。

Description

调节显示模组的伽马电压的方法 技术领域
本公开涉及显示技术领域，并且具体地，涉及用于调整显示模组的伽马电压的方法及对应的显示模组。
背景技术
低温多晶氧化物(LTPO)技术是智能时代显示模组设计的核心技术之一。自适应刷新频率，即根据使用场景自适应切换不同的刷新频率且画质不发生变化，是LTPO显示模组实现的重要功能之一。
现有的LTPO显示模组仅在刷新帧(高频)进行伽马调谐(Gamma Tuning)，而在保持帧(低频)则借用刷新帧的伽马电压，并通过调节保持帧的相关电压来降低不同频率下的画质差异，然而根据当前集成电路芯片(IC)的设计，显示模组的同一显示亮度值(DBV)下不同灰阶的电压设定是相同的，这造成了显示模组的高灰阶与低灰阶在频率切换过程中的亮度差异不同，即造成频闪。
当具有频闪缺陷的显示模组被应用于日常生活中常见的包括显示屏幕的电子设备时，将影响用户的使用体验。此外，电子设备的显示屏幕的频闪还可能对用户的健康造成影响。例如，如果人眼长时间接受低频的频闪刺激，则会产生眼部肌肉疲劳，引起眼睛甚至身体的不适。
发明内容
本申请提出一种改善LTPO显示模组多频切换(VRR)效果的伽马电压调节方式，其中，可以根据不同的频率来采用不同的伽马电压。该方法可以在不占用IC较大的存储空间并且可以不增加伽马调谐的时间的情况下有效改善相同DBV下不同灰阶在频率切换过程中的VRR效果。
本申请至少一个实施例提供一种用于调节显示模组的伽马电压的方法，包括：获取显示模组在基础刷新频率下的伽马电压；获取显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系；以及基于显示模组在基础刷新频率下的伽马电压和关联关系来确定显示模组在目 标刷新频率下的伽马电压。
例如，在本申请的一个实施例提供的调节方法中，关联关系与显示模组的显示亮度值相对应，并且不同显示亮度值具有与其相对应的关联关系。
例如，在本申请的一个实施例提供的调节方法中，还包括：确定显示模组的当前显示亮度值；其中，获取显示模组在基础刷新频率下的伽马电压包括：获取在当前显示亮度值下显示模组在基础刷新频率下的伽马电压，以及其中，获取显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系包括：获取在当前显示亮度值下显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系。
例如，在本申请的一个实施例提供的调节方法中，关联关系包括比例关系，并且获取在当前显示亮度值下显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系包括：对于多个灰阶中的每个灰阶，获取在当前显示亮度值下在基础刷新频率下该灰阶的伽马电压与在目标刷新频率下该灰阶的伽马电压之间的比例关系。
例如，在本申请的一个实施例提供的调节方法中，比例关系由Y＝αy表征，并且其中，Y表示在目标刷新频率下的一个灰阶的伽马电压，y表示在基础刷新频率下的该灰阶的伽马电压，以及α表示伽马比率。
例如，在本申请的一个实施例提供的调节方法中，比例关系为伽马比率，获取在当前显示亮度值下显示模组在基础刷新频率下该灰阶的伽马电压与在目标刷新频率下该灰阶的伽马电压之间的比例关系，包括：获取多个灰阶中的至少两个特定灰阶的伽马比率，其中，伽马比率指示在当前显示亮度值下显示模组在基础刷新频率下灰阶的伽马电压与在目标刷新频率下对应灰阶的伽马电压之间的比率；以及基于至少两个特定灰阶的伽马比率进行插值，以获得多个灰阶中的每个灰阶的伽马比率。
例如，在本申请的一个实施例提供的调节方法中，比例关系为伽马比率，获取在当前显示亮度值下在基础刷新频率下该灰阶的伽马电压与在目标刷新频率下该灰阶的伽马电压之间的比例关系，包括：对于多个灰阶中的每个灰阶，在基础刷新频率和多个非基础刷新频率中，确定与目标刷新频率接近的至少两个非基础刷新频率，对于至少两个非基础刷新频率中的每个非基础刷新频率，获得该非基础刷新频率的伽马比率，其中，伽马比率指示在当前显示亮度值下所述显示模组在基础刷新频率下该灰阶的伽马电压与在该非 基础刷新频率下对应灰阶的伽马电压之间的比率；以及基于至少两个非基础刷新频率中的各非基础刷新频率的伽马比率进行插值，以获得目标刷新频率的伽马比率。
例如，在本申请的一个实施例提供的调节方法中，基于显示模组在基础刷新频率下的伽马电压和关联关系来确定显示模组在目标刷新频率下的伽马电压，包括：在显示模组的当前显示亮度值下，对于多个灰阶中的每个灰阶，基于在基础刷新频率下所述灰阶的伽马电压和在基础刷新频率下该灰阶的伽马电压与在目标刷新频率下该灰阶的伽马电压之间的比例关系的乘积，确定目标刷新频率下该灰阶的伽马电压。
例如，在本申请的一个实施例提供的调节方法中，关联关系包括多项式关系，并且获取在当前显示亮度值下显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系包括：获取用于表征在当前显示亮度值下显示模组在基础刷新频率下各灰阶的伽马电压和在目标刷新频率下各对应灰阶的伽马电压之间的电压关系曲线的多项式的多个系数。
例如，在本申请的一个实施例提供的调节方法中，多项式关系由Δy＝ax 2+bx+c表征，并且其中，Δy表示在基础刷新频率下一个灰阶的伽马电压和在目标刷新频率下该灰阶的伽马电压之间的差值，x表示灰阶，并且a、b和c为多项式系数。
例如，在本申请的一个实施例提供的调节方法中，基于显示模组在基础刷新频率下的伽马电压和关联关系来确定显示模组在目标刷新频率下的伽马电压，包括：在显示模组的当前显示亮度值下，基于基础刷新频率下多个灰阶中各灰阶的伽马电压和多个系数，确定在目标刷新频率下各灰阶的伽马电压。
本申请至少一个实施例提供一种用于确定显示模组的伽马电压之间的关联关系的方法，包括：测量显示模组在基础刷新频率下的伽马电压；测量显示模组在一个或多个非基础刷新频率下的伽马电压；以及基于显示模组在基础刷新频率下的伽马电压和在一个或多个非基础刷新频率下的伽马电压来确定显示模组的伽马电压之间的关联关系。
例如，在本申请的一个实施例提供的确定方法中，关联关系与显示模组的显示亮度值相对应，不同显示亮度值具有与其相对应的关联关系。
例如，在本申请的一个实施例提供的确定方法中，还包括：测量显示模 组的当前显示亮度值；其中，测量显示模组在基础刷新频率下的伽马电压包括：测量在当前显示亮度值下显示模组在基础刷新频率下的多个灰阶的伽马电压，以及其中，测量显示模组在一个或多个非基础刷新频率下的伽马电压包括：对于一个或多个非基础刷新频率中的每个非基础刷新频率，测量在当前显示亮度值下显示模组在该非基础刷新频率下的多个灰阶的伽马电压。
例如，在本申请的一个实施例提供的确定方法中，关联关系包括比例关系，并且基于显示模组在基础刷新频率下的伽马电压和在一个或多个非基础刷新频率下的伽马电压来确定显示模组的伽马电压之间的关联关系包括：对于一个或多个非基础刷新频率中的每个非基础刷新频率，确定指示在当前显示亮度值下在基础刷新频率下多个灰阶的伽马电压与在非基础刷新频率下各对应灰阶的伽马电压之间的比率的伽马比率。
例如，在本申请的一个实施例提供的确定方法中，关联关系包括比例关系，基于显示模组在基础刷新频率下的伽马电压和在一个或多个非基础刷新频率下的伽马电压来确定显示模组的伽马电压之间的关联关系包括：对于多个灰阶中的每个灰阶，确定指示在当前显示亮度值下在基础刷新频率下该灰阶的伽马电压与在一个或多个非基础刷新频率下该灰阶的伽马电压之间的比率的伽马比率。
例如，在本申请的一个实施例提供的确定方法中，关联关系包括多项式关系，并且确定在当前显示亮度值下在基础刷新频率下多个灰阶中的每个灰阶的伽马电压与在一个或多个非基础刷新频率下多个灰阶中的每个灰阶的伽马电压之间包括：确定用于表征在当前显示亮度值下显示模组在基础刷新频率下多个灰阶的伽马电压和在一个或多个非基础刷新频率下多个对应灰阶的伽马电压之间的电压关系曲线的多项式的多个系数。
本申请至少一个实施例提供一种显示装置，该显示装置包括存储器以及与该存储器耦合的处理器，该处理器被配置为：获取显示装置在基础刷新频率下的伽马电压；获取显示装置在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系；以及基于显示装置在基础刷新频率下的伽马电压和关联关系来确定所述显示装置在目标刷新频率下的伽马电压。
附图说明
为了更清楚地说明本公开实施例的技术方案，下面将对实施例的附图作简单地介绍，显而易见地，下面描述中的附图仅仅涉及本公开的一些实施例，而非对本公开的限制，其中：
图1A是LTPO显示模组由低刷新频率驱动的时序示意图；
图1B是LTPO显示模组在高刷新频率下和低刷新频率下不同灰阶存在亮度差异的原理图；
图1C是LTPO模组在高刷新频率下和低刷新频率下的不同灰阶的亮度差异的实测图；
图2是存储不同DBV下在不同刷新频率下的各个灰阶的伽马电压的方法的示意图；
图3是根据本公开实施例的一种调节LTPO显示模组的伽马电压以改善VRR效果的方法的流程图；
图4A示出了根据本公开的实施例的相同DBV下在非基础刷新频率下的灰阶的伽马电压与基础刷新频率下的对应灰阶的伽马电压存在比例关系的示意图；
图4B示出了根据本公开的实施例的利用图4A的比例关系确定非基础刷新频率下的各个灰阶的伽马电压的方法的示意图；
图4C示出了根据本公开的实施例的利用图4A的比例关系确定非基础刷新频率下的各个灰阶的伽马电压的另一方法的示意图；
图5是根据本公开实施例的在非基础刷新频率下的不同灰阶的伽马电压和在基础刷新频率下的不同灰阶的伽马电压之间的差值的关系的示意图；
图6是根据本公开实施例的确定在基础刷新频率下的各个灰阶的伽马电压和在非基础刷新频率下的各个灰阶的伽马电压之间的关联关系的方法的流程图；
图7A和图7B是根据本公开实施例的确定在基础刷新频率下的各个灰阶的伽马电压和在非基础刷新频率下的各个灰阶的伽马电压之间的比例关系的方法的示意图；
图8A是实现根据本公开实施例的调节LTPO显示模组的伽马电压的方法的显示装置；
图8B是实现根据本公开实施例的调节LTPO显示模组的伽马电压的方法的显示设备；以及
图9是应用根据本公开实施例的调节LTPO显示模组的伽马电压的方法以改善VRR效果的实测效果图。
具体实施方式
为使本公开实施例的目的、技术方案和优点更加清楚，下面将结合本公开实施例的附图，对本公开实施例的技术方案进行清楚、完整地描述。显然，所描述的实施例是本公开的一部分实施例，而不是全部的实施例。基于所描述的本公开的实施例，本领域普通技术人员在无需创造性劳动的前提下所获得的所有其他实施例，都属于本公开保护的范围。
除非另外定义，本公开使用的技术术语或者科学术语应当为本公开所属领域内具有一般技能的人士所理解的通常意义。本公开中使用的“第一”、
“第二”以及类似的词语并不表示任何顺序、数量或者重要性，而只是用来区分不同的组成部分。同样，“一个”、“一”或者“该”等类似词语也不表示数量限制，而是表示存在至少一个。“包括”或者“包含”等类似的词语意指出现该词前面的元件或者物件涵盖出现在该词后面列举的元件或者物件及其等同，而不排除其他元件或者物件。“连接”或者“相连”等类似的词语并非限定于物理的或者机械的连接，而是可以包括电性的连接，不管是直接的还是间接的。“上”、“下”、“左”、“右”等仅用于表示相对位置关系，当被描述对象的绝对位置改变后，则该相对位置关系也可能相应地改变。
图1A是LTPO显示模组由低刷新频率驱动的时序示意图。如图1A所示，LTPO显示模组可以以刷新帧和保持帧的组合来驱动。刷新帧指代在其中更新像素数据的帧，并且保持帧指代在其中未更新(即仅保持)像素数据的帧。在图1A中，以10Hz低刷新频率模式为例，参考频率(即基础刷新频率)为120Hz，一个周期可以包括1个刷新帧和11个保持帧。在图1A中，TE-sync为帧同步信号，TE-test指示刷新帧，GOA信号指示动作切换。
图1B是LTPO显示模组在高刷新频率下和低刷新频率下不同灰阶存在亮度差异的原理图。通常，高刷新频率是指高于80Hz的刷新频率，低刷新频率是指低于60Hz的刷新频率。
如图1B所示，在刷新帧，数据电压Data(n)更新，晶体管T2的源极电压(如图中节点N3所示)被刷新，并且Gate-N(n)使晶体管T2导通以向电 容器C st写入数据电压；在保持帧，数据电压Data(n)不更新，且Gate-N(n)使晶体管T2关闭且不向CST写入数据电压。然而，由于在保持帧Gate-N(n)关闭且不刷新源极电压Data(n)，导致节点N3的电压在刷新帧和保持帧之间存在差异。具体地，节点N3的电压在保持帧更高，导致晶体管T6提前打开对节点N4进行预充电，从而节点N4的电压在保持帧变高，导致LTPO显示模组在保持帧与刷新帧之间存在亮度差异。因此，如果在刷新频率切换过程中源极电压不发生变化，则节点N3和节点N4的电压在刷新帧和保持帧之间的差异将造成在低刷新频率下的画面闪烁和高刷新频率和低刷新频率切换过程的画面闪烁。在图1B中，EM(n)为发光控制信号且提供至晶体管T5和T6的栅极，Reset_N(n)为复位信号，Gate-P(n)为晶体管T4和T7的栅极控制信号，节点N1连接晶体管T3的栅极，Vinit1和Vinit2为初始设置信号。
图1C是LTPO模组在高刷新频率下和低刷新频率下的不同灰阶的亮度差异的实测图。如图1C所示，在同一DBV下在120Hz的刷新频率下和10Hz的刷新频率下的不同灰阶存在亮度差异，其中横轴为灰阶，纵轴为亮度差异，具体地，随着灰阶逐渐升高，在120Hz下和10Hz下的灰阶的亮度差异逐渐减小。
因为不可避免地会受到TFT制作工艺的影响，LTPO显示模组的像素电路会产生一定的扰动电流△I。高灰阶的亮度较高，电流I1较大，而低灰阶的亮度较低，电流I2较小，即I1>I2。扰动电流△I对高低灰阶的影响分别为△I/I1<△I/I2，即扰动电流对高灰阶的影响较小而对低灰阶的影响较大。因此，在同一DBV下进行刷新频率切换时，高灰阶和低灰阶之间会存在较大的亮度及颜色差异。
根据现有的LTPO驱动方式，同一DBV下的不同灰阶除了源极电压不同之外，其它节点的驱动电压都是一致的。然而，这种驱动方式无法满足在同一DBV下进行刷新频率切换时高灰阶和低灰阶都要满足较小的亮度和色度差异需求。减小节点N4的电压在高刷新频率和低刷新频率之间的差异是改善同一DBV下进行刷新频率切换时不同灰阶存在亮度差异的有效方法。
对于不同刷新频率下的不同灰阶应用不同的伽马电压可以改变高灰阶和低灰阶在节点N4的电压，从而改变的N4点电压在高刷新频率和低刷新频率之间的差异，从而改善在同一DBV下高灰阶和低灰阶在刷新频率切换过 程中的亮度差异。
在一些实施例可以存储不同DBV下在不同刷新频率下的不同灰阶的伽马电压，并根据实际使用情况在需要时读取该伽马电压。图2示出了存储不同DBV下在不同刷新频率下的各个灰阶的伽马电压的方法的示意图。具体地，针对不同DBV，在不同刷新频率下进行伽马调谐，确定不同DBV下在不同刷新频率下的不同灰阶的伽马电压，并且将确定的伽马电压存储在芯片IC中。当LTPO显示模组在某一DBV下从当前刷新频率切换到另一刷新频率时，从IC中读取并应用存储的在该另一刷新频率下的各个灰阶的伽马电压，以改善从当前刷新频率切换到另一刷新频率过程中的VRR效果。
IC中可以存储与多个DBV相对应的在多个不同刷新频率下的多个灰阶的伽马电压。在一个示例中，LTPO显示模组的当前刷新频率为120Hz，当该显示模组要切换到30Hz的刷新频率时，可以从IC中读取与LTPO显示模组的当前DBV相对应的在30Hz的刷新频率下的不同灰阶的伽马电压并应用读取的多个伽马电压。
通过在不同刷新频率下调用各自刷新频率下的不同灰阶的伽马电压，可以有效的改善刷新频率切换过程中相同DBV下不同灰阶的亮度差异，从而有效提升LTPO显示模组的画质水平，改善LTPO显示模组的VRR效果。
然而，由于LTPO显示模组需要实现多个刷新频率之间的切换，如果针对每个刷新频率都进行伽马调谐则需要大量的伽马调谐时间，并且IC中也要增加额外的存储空间去存储相关的数据，例如，通过伽马调谐得到的在不同刷新频率下的不同灰阶的伽马电压，这将大幅提高LTPO显示模组的制造成本。因此，需要寻找有效合理的方法来解决多个刷新频率的伽马调谐以及相关数据存储的问题。
为此，本公开提出一种LTPO显示模组的VRR效果优化的调节方式，能够对在不同刷新频率下的不同灰阶采用不同的伽马电压，同时不占用IC较大的存储空间并且不需要过多的伽马调谐时间。该方法可以有效地改善相同DBV下进行刷新频率切换时不同灰阶的VRR效果，通过使像素电路的节点N4的电压的变化在高灰阶和低灰阶之间达到平衡，从而使高灰阶和低灰阶在刷新帧与保持帧之间的亮度差异有效减小。
图3是根据本公开实施例的一种调节LTPO显示模组的伽马电压以改善VRR效果的方法的流程图。
如图3所示，在301，获取LTPO显示模组的在基础刷新频率下的各个灰阶的伽马电压。LTPO显示模组可以具有多个不同的DBV，并且不同DBV下在不同刷新频率下的多个灰阶具有不同的伽马电压。具体地，不同DBV下LTPO显示模组在基础刷新频率下的各个灰阶的伽马电压被存储在IC中，当需要获取LTPO显示模组的基础刷新频率下的各个灰阶的伽马电压时，首先确定LTPO显示模组的当前DBV，然后从IC中获取与当前DBV相对应的基础刷新频率下的各个灰阶的伽马电压。
在303，获取LTPO显示模组的在基础刷新频率下的各个灰阶的伽马电压和在目标刷新频率下的各个灰阶的伽马电压之间的关联关系。
在一些实施例中，该关联关系可以是比例关系。在一个示例中，比例关系可以表示相同DBV下在基础刷新频率下的灰阶的伽马电压与在非基础刷新频率下的该灰阶的伽马电压之间的比例关系。例如，比例关系可以由Y＝αy表征，其中，y表示在基础刷新频率下的不同灰阶的伽马电压，Y表示在非基础刷新频率下的对应灰阶的伽马电压，α表示在基础刷新频率下的不同灰阶的伽马电压和在目标刷新频率下的对应灰阶的伽马电压之间的比率，即伽马比率。
在另一些实施例中，该关联关系可以是多项式关系。在一个示例中，多项式关系可以表示相同DBV下在基础刷新频率下的灰阶的伽马电压与在非基础刷新频率下的该灰阶的伽马电压之间的差值。多项式关系可以由Δy＝ax 2+bx+c表征，其中Δy表示目标刷新频率与基础刷新频率下伽马电压之间的差值，x表示灰阶，a、b和c为多项式系数。
然后，在305，基于在基础刷新频率下的各个灰阶的伽马电压和该关联关系来确定在目标刷新频率下的各个灰阶的伽马电压。
当关联关系为比例关系时，目标刷新频率下的各个灰阶的伽马电压可以是基础刷新频率下的各个灰阶的伽马电压与伽马比率的乘积。
当关联关系为多项式关系时，可以首先通过Δy＝ax 2+bx+c得到相同DBV下在基础刷新频率下的各个灰阶的伽马电压与在非基础刷新频率下的对应灰阶的伽马电压之间的差值Δy，然后通过Y＝y+Δy得到在非基础刷新频率下的各个灰阶的伽马电压。
下面，将参考附图4-5详细地说明本公开的一些实施例。应当注意的是，不同的附图中相同或相似的附图标记将用于指代已描述的相同的元件。
图4A示出了根据本公开的实施例的相同DBV下在非基础刷新频率下的灰阶的伽马电压与基础刷新频率下的对应灰阶的伽马电压存在比例关系的示意图。该比例关系可以由如下等式表征：
Y＝αy
其中，y表示在基础刷新频率下的不同灰阶的伽马电压，Y表示在非基础刷新频率下的对应灰阶的伽马电压，α表示在基础刷新频率下的不同灰阶的伽马电压和在目标刷新频率下的对应灰阶的伽马电压之间的比率，即伽马比率(gamma ratio)。
对于相同DBV下的相同灰阶，其在不同的非基础刷新频率下具有不同的伽马比率。如图4A所示，相同DBV下在120Hz的基础刷新频率下的某一灰阶的伽马电压为gamma 1，在60Hz的非基础刷新频率1下的该灰阶的伽马电压与在基础刷新频率120Hz下的该灰阶的伽马电压之间的伽马比率为伽马比率1；在30Hz的非基础刷新频率2下的该灰阶的伽马电压与在基础刷新频率120Hz下的该灰阶的伽马电压之间的伽马比率为伽马比率2；在10Hz的非基础刷新频率3下的该灰阶的伽马电压与在基础刷新频率120Hz下的该灰阶的伽马电压之间的伽马比率为伽马比率3，以此类推，在x Hz的非基础刷新频率n下的该灰阶的伽马电压与在基础刷新频率120Hz下的该灰阶的伽马电压之间的伽马比率为伽马比率n。
图4B示出了根据本公开的实施例的利用图4A的比例关系确定非基础刷新频率下的各个灰阶的伽马电压的方法的示意图。
在图4B中，横轴表示伽马比率，纵轴表示伽马电压。如图4B所示，相同DBV下在不同非基础刷新频率下，相同灰阶具有不同的伽马比率。
在一些实施例中，当LTPO显示模组要切换到非基础刷新频率，即目标刷新频率时，首先确定LTPO显示模组的当前DBV，随后获取存储在IC中的当前DBV下在基础刷新频率下的灰阶的伽马电压和在目标刷新频率下的多个绑点灰阶的伽马比率，通过线性插值获得与非绑点灰阶相对应的伽马比率，并通过在基础刷新频率下的多个灰阶的伽马电压和通过插值运算获得的对应灰阶的伽马比率的乘积来确定在目标刷新频率下的多个灰阶的伽马电压。
在一个示例中，LTPO显示模组的当前刷新频率为120Hz，并且目标刷新频率为30Hz。首先，确定LTPO显示模组的当前DBV，从存储在IC中的 与当前DBV相对应的在30Hz的刷新频率下的绑点灰阶的伽马比率。例如，绑点灰阶可以是0、16、32、64、128和255，即可以获得这些灰阶的伽马比率。而对于IC中未存储的、非绑点灰阶的伽马比率，则可以通过线性插值来获得。例如，绑点灰阶0的伽马比率为伽马比率1，并且绑点灰阶16的伽马比率为伽马比率2，那么灰阶0和灰阶16之间的其他灰阶的伽马比率则可以通过线性插值来获得。具体地，灰阶4的伽马比率可以通过如下等式计算：
Figure PCTCN2022123005-appb-000001
其中，gamma ratio表示伽马比率，gamma ratio1表示伽马比率1，gamma ratio2表示伽马比率2。类似的，其他非绑点灰阶的伽马比率也可以通过这种方式进行线性插值来得到。
当获得在目标刷新频率下的各个灰阶的伽马比率后，通过等式Y＝αy可以计算得到在目标刷新频率下的各个灰阶的伽马电压。例如，在基础刷新频率下的灰阶0的伽马电压为gamma1，并且在目标刷新频率下的灰阶0的伽马比率为伽马比率1，那个在目标刷新频率下的灰阶0的伽马电压即为gamma ratio 1×gamma1。
图4C示出了根据本公开的实施例的利用图4A的比例关系确定非基础刷新频率下的各个灰阶的伽马电压的另一方法的示意图。
在图4C中，横轴表示灰阶，纵轴表示伽马比率。如图4C所示，相同DBV下在相同非基础刷新频率下，不同灰阶具有不同的伽马比率。
在一些实施例中，当LTPO显示模组要切换到非基础刷新频率，即目标刷新频率时，如果与该目标刷新频率相对应的伽马比率已经被存储在IC中(即，该目标刷新频率是若干绑点非基础刷新频率中的一个)，则可以直接调用存储的伽马比率来确定在该目标刷新频率下的灰阶的伽马电压。具体地，首先确定LTPO显示模组的当前DBV，随后可以直接获取存储在IC中的在当前DBV下在基础刷新频率下的灰阶的伽马电压和与该目标刷新频率相对应的伽马比率，通过在基础刷新频率下的灰阶的伽马电压和该伽马比率的乘积来确定在目标刷新频率下的该灰阶的伽马电压。
在一个示例中，IC中存储了不同DBV下在10Hz、30Hz、60Hz和90Hz的刷新频率下灰阶的伽马比率，LTPO显示模组的当前刷新频率为120Hz，并且目标刷新频率为30Hz。因为不同DBV下在30Hz的刷新频率 下的灰阶的伽马比率已经被存储在IC中，所以可以直接获得该伽马比率并计算对应的伽马电压。首先，确定LTPO显示模组的当前DBV，从存储在IC中的与当前DBV相对应的在30Hz的目标刷新频率下的灰阶的伽马比率和基础刷新频率下的灰阶的伽马电压。然后，可以通过等式Y＝αy可以计算得到在目标刷新频率下的灰阶的伽马电压。
在另一些实施例中，当LTPO显示模组要切换到非基础刷新频率，即目标刷新频率时，如果与该目标刷新频率相对应的伽马比率没有经被存储在IC中(即，该目标刷新频率不是绑点非基础刷新频率)，则可以通过线性插值运算来获得与该目标刷新频率相对应的伽马比率，以确定在该目标刷新频率下的灰阶的伽马电压。具体地，首先确定LTPO显示模组的当前DBV，随后可以获取存储在DC中的在当前DBV下在基础刷新频率下的灰阶的伽马电压和与若干绑点非基础刷新频率相对应的伽马比率，通过线性插值获得与该目标刷新频率相对应的伽马比率，并通过在基础刷新频率下的灰阶的伽马电压和通过插值运算获得的伽马比率的乘积来确定在该目标刷新频率下的该灰阶的伽马电压。
在一个示例中，在一个示例中，IC中存储了不同DBV下在10Hz、30Hz、60Hz和90Hz的刷新频率下灰阶的伽马比率，LTPO显示模组的当前刷新频率为120Hz，并且目标刷新频率为50Hz。因为不同DBV下在50Hz的刷新频率下的灰阶的伽马比率没有被存储在IC中，所以需要通过线性插值来获得50Hz的刷新频率下的灰阶的伽马电压。例如，30Hz的刷新频率下的灰阶的伽马比率为伽马比率3，并且60Hz的刷新频率下的灰阶的伽马比率为伽马比率4，那么50Hz的刷新频率下的对应灰阶的伽马电压可以通过如下等式计算：
Figure PCTCN2022123005-appb-000002
其中，gamma ratio表示伽马比率，gamma ratio3表示伽马比率3，gamma ratio4表示伽马比率4。当获得在目标刷新频率下的该灰阶的伽马比率后，通过等式Y＝αy可以计算得到在目标刷新频率下的该灰阶的伽马电压。
图5是根据本公开实施例的在非基础刷新频率下的不同灰阶的伽马电压和在基础刷新频率下的不同灰阶的伽马电压之间的差值的关系的示意图。
图5中所示的关系可以由如下多项式表征：
Δy＝ax 2+bx+c
其中，Δy表示在基础刷新频率下的不同灰阶的伽马电压与非基础刷新频率下的不同灰阶的伽马电压之间的差值，x表示灰阶，a、b、c分别为多项式的系数。
在一些实施例中，当LTPO显示模组要切换到非基础刷新频率，即目标刷新频率时，可以通过调用多项式Δy＝ax 2+bx+c和与目标刷新频率相对应的多项式系数a、b、c来计算在该目标刷新频率下的多个灰阶的伽马电压与在基础刷新频率下的对应灰阶的伽马电压之间的差值Δy。然后，从IC获取在基础刷新频率下的对应灰阶的伽马电压，并通过公式Y＝y+Δy来确定在该目标刷新频率下的多个灰阶的伽马电压。
在一个示例中，IC中分别存储了在10Hz、30Hz、60Hz和90Hz的刷新频率下多项式的系数a、b、c。LTPO显示模组的当前刷新频率为120Hz，并且目标刷新频率为30Hz。因为在30Hz的目标刷新频率下的多项式的系数a、b、c已经被存储在IC中，所以可以直接获得该系数并通过Δy＝ax 2+bx+c来计算在目标刷新频率下的各个灰阶的伽马电压与在基础刷新频率下的对应灰阶的伽马电压之间的差值。然后，可以通过Y＝y+Δy来确定在目标刷新频率下的各个灰阶的伽马电压。
在另一示例中，IC中分别存储了在10Hz、30Hz、60Hz和90Hz的刷新频率下多项式的系数a、b、c。LTPO显示模组的当前刷新频率为120Hz，并且目标刷新频率为50Hz。因为在50Hz的目标刷新频率下的多项式的系数a、b、c没有被存储在IC中，则需要通过线性插值来获得50Hz的刷新频率下的多项式的系数a、b、c。具体地，首先获得在30Hz的刷新频率下的多项式的系数a1、b1、c1，和在60Hz的刷新频率下的多项式的系数a2、b2、c2。通过线性插值，在50Hz的目标刷新频率下的多项式的系数a3可以通过如下等式计算：
Figure PCTCN2022123005-appb-000003
类似地，在50Hz的目标刷新频率下的多项式的系数b3和c3可以分别被计算为
Figure PCTCN2022123005-appb-000004
和
Figure PCTCN2022123005-appb-000005
下面，将基于图6-7来说明根据本公开的以上实施例中的关联关系的确定。
图6是根据本公开实施例的确定在基础刷新频率下的各个灰阶的伽马电压和在非基础刷新频率下的各个灰阶的伽马电压之间的关联关系的方法的流程图。
如图6所示，在601，测量LTPO显示模组在基础刷新频率下的各个灰阶的伽马电压。LTPO显示模组可以具有多个不同的DBV，并且不同DBV下在不同刷新频率下的多个灰阶具有不同的伽马电压。具体地，对于不同DBV下，在基础刷新频率下进行伽马调谐，以获得不同DBV下在基础刷新频率下各个灰阶的伽马电压。
在603，测量LTPO显示模组在一个或多个非基础刷新频率下的各个灰阶的伽马电压。具体地，对于一个或多个非基础刷新频率中的每一个，在不同DBV下，在该非基础刷新频率下进行伽马调谐，以获得不同DBV下在该非基础刷新频率下的各个灰阶的伽马电压。
在605，基于LTPO显示模组在基础刷新频率下的各个灰阶的伽马电压和一个或多个非基础刷新频率下的对应灰阶的伽马电压来确定该显示模组的伽马电压之间的关联关系。
在一些实施例中，对于一个或多个非基础刷新频率中的每个非基础刷新频率，可以确定相同DBV下在基础刷新频率下的各个灰阶的伽马电压和在该非基础刷新频率下的对应灰阶的伽马电压之间存在比例关系。可替换地，对于各个灰阶中的每个灰阶，可以确定相同DBV下在基础刷新频率下的该灰阶的伽马电压和在一个或多个非基础刷新频率下的该灰阶的伽马电压之间存在比例关系。比例关系可以由Y＝αy表征，确定该比例关系包括确定比率α，该比率也可以被称为伽马比率。
在另一些实施例中，对于一个或多个非基础刷新频率中的每个非基础刷新频率，可以确定对于不同DBV，在基础刷新频率下的各个灰阶的伽马电压与在该非基础刷新频率下的对应灰阶的伽马电压之间的差值符合多项式关系。多项式关系可以由Δy＝ax 2+bx+c表征，确定该多项式关系包括确定多项式的系数a、b、c。
图7A和图7B是根据本公开实施例的确定在基础刷新频率下的各个灰阶的伽马电压和在一个或多个非基础刷新频率下的各个灰阶的伽马电压之间的比例关系的方法的示意图。
图7A示出了对于一个或多个非基础刷新频率中的每个非基础刷新频率 确定相同DBV下在基础刷新频率下的各个灰阶的伽马电压和在该非基础刷新频率下的对应灰阶的伽马电压之间的比例关系的示意图。
参考图7A，对于多个DBV中的每个DBV，在基础刷新频率下进行伽马调谐以确定该DBV下在基础刷新频率下的多个灰阶的伽马电压。对于一个或多个非基础刷新频率中的每一个，在该非基础刷新频率下进行伽马调谐以确定该DBV下在该非基础刷新频率下的对应灰阶的伽马电压。相同DBV下，对于一个或多个非基础刷新频率中的每个非基础刷新频率，确定在基础刷新频率下的各个灰阶的伽马电压和在该非基础刷新频率下的对应灰阶的伽马电压之间的比例关系。该比例关系可以由如下等式表征：
Y＝αy
其中，y表示在基础刷新频率下的不同灰阶的伽马电压，Y表示在非基础刷新频率下的对应灰阶的伽马电压，α表示在基础刷新频率下的不同灰阶的伽马电压和在非基础刷新频率下的对应灰阶的伽马电压之间的比率，即伽马比率。
由于LTPO显示模组可以具有多个不同DBV，并且可以在多个不同刷新频率间切换，如果针对不同DBV下的不同刷新频率下的各个灰阶的伽马比率都被存储在IC则会需要大量存储空间。
在实际制造过程中，为了减少每台设备的伽马调谐的时间并且降低IC中需要的存储空间，在某一DBV下，对于一个或多个非基础刷新频率中的每个非基础刷新频率，可以只在IC中存储在该非基础刷新频率下的各个灰阶中的若干特定灰阶的伽马比率。从各个灰阶中选择该若干特定灰阶可以被称为灰阶的绑点，该若干特定灰阶可以被称为灰阶绑点。
在一些实施例中，基础刷新频率为120Hz，一个或多个非基础刷新频率中的一个非基础刷新频率为30Hz。对于30Hz的非基础刷新频率的绑点可以被如下确定：在120Hz的基础刷新频率下进行伽马调谐，以确定在120Hz下的各个灰阶的伽马电压gamma 120 0、gamma 120 1、…、gamma 120 255；在相同DBV下，在30Hz的非基础刷新频率下进行伽马调谐，以确定在30Hz下的对应灰阶的伽马电压gamma 30 0、gamma 30 1、…、gamma 30 255；计算在30Hz下的各个灰阶的伽马电压与在120Hz下的对应灰阶的伽马电压之间的伽马比率0、伽马比率1、…、伽马比率255。从多个灰阶中选择绑点灰阶，使得绑点灰阶的伽马比率可以由分段线性函数表征。例如，由伽马比率 0和伽马比率15确定的线性函数上的点可以较好地覆盖伽马比率1至伽马比率14。因此，与伽马比率0和伽马比率15相对应的灰阶0和15可以被选择为绑点灰阶。以这种方式，可以确定在30Hz下的其他绑点灰阶。其他非基础刷新频率下的绑点灰阶也可以以类似的方式确定。
图7B示出了对于各个灰阶中的每个灰阶确定相同DBV下在基础刷新频率下的该灰阶的伽马电压和在一个或多个非基础刷新频率下的该灰阶的伽马电压之间的比例关系的示意图。
参考图7B，对于多个DBV中的每个DBV，在基础刷新频率下进行伽马调谐以确定该DBV下在基础刷新频率下的多个灰阶的伽马电压。对于多个灰阶中的每个灰阶，相同DBV下在不同非基础刷新频率下具有不同的伽马电压。相同DBV下，对于多个灰阶中的每个灰阶，确定在基础刷新频率下的该灰阶的伽马电压和在一个或多个非基础刷新频率下的该灰阶的伽马电压之间的比例关系。该比例关系也可以由如下等式表征：
Y＝αy
其中，y表示在基础刷新频率下的该灰阶的伽马电压，Y表示在一个或多个非基础刷新频率下的该灰阶的伽马电压，α表示在基础刷新频率下的该灰阶的伽马电压和在一个或多个非基础刷新频率下的该灰阶的伽马电压之间的比率，即伽马比率。
由于LTPO显示模组可以具有多个不同DBV，并且可以在多个不同刷新频率间切换，如果针对不同DBV下在不同刷新频率下的各个灰阶的伽马比率都被存储在IC则会需要大量存储空间。
在实际制造过程中，为了减少伽马调谐的时间并且降低IC中需要的存储空间，在某一DBV下，对于各个灰阶中的每个灰阶，可以只在IC中存储在一个或多个非基础刷新频率中的若干特定非基础刷新频率下的该灰阶的伽马比率。从一个或多个非基础刷新频率该若干特定非基础刷新频率可以被称为非基础刷新频率的绑点，该若干特定非基础刷新频率可以被称为非基础刷新频率绑点。
在一些实施例中，基础刷新频率为120Hz，多个非基础刷新频率中可以包括5Hz、10Hz、15Hz、…、105Hz、110Hz和115Hz。以灰阶128为例，多个非基础刷新频率的绑点非基础刷新频率可以被如下确定：在120Hz的基础刷新频率下进行伽马调谐，以确定在120Hz下的各个灰阶的伽马电压 gamma 120 0、gamma 120 1、…、gamma 120 255，其中，灰阶128的伽马电压为gamma 120 128；在相同DBV下，分别在5Hz、10Hz、15Hz、…、105Hz、110Hz和115Hz下进行伽马调谐，已确定在多个非基础刷新频率下的各个灰阶的伽马电压，其中，在多个非基础刷新频率下的灰阶128的伽马电压可以分别为gamma 5 128、gamma 10 128、gamma 15 128、…、gamma 105 128、gamma 110 128和gamma 115 128；计算在各个非基础刷新频率下的灰阶128的伽马电压与在120Hz下的灰阶128的伽马电压之间的伽马比率 5 128、伽马比率 10 128、…、伽马比率 115128。从多个非基础刷新频率中选择绑点非基础刷新频率，使得绑点非基础刷新频率的伽马比率可以由分段线性函数表征。例如，由伽马比率 10 128和伽马比率 30 128确定的线性函数上的点可以较好地覆盖伽马比率 10 128和伽马比率 30 128之间的各个非基础刷新频率下的灰阶128的伽马比率。因此，与伽马比率 10 128和伽马比率 30 128相对应的非基础刷新频率10Hz和30Hz可以被选择为绑点非基础刷新频率。
回到图5，接下来将参考图5来描述确定在基础刷新频率下的各个灰阶的伽马电压和在非基础刷新频率下的各个灰阶的伽马电压之间的多项式关系的方法。
为了能够对于在不同刷新频率下的不同灰阶采用不同的伽马电压，同时不占用IC较大的存储空间并且不需要大量伽马调谐时间，可以建立在基础刷新频率下的不同灰阶的伽马电压和在非基础刷新频率下的不同灰阶的伽马电压之间的插值的多项式关系，并基于所建立的多项式关系来确定非基础刷新频率下的不同灰阶的伽马电压。
在基础刷新频率下和非基础刷新频率下分别进行伽马调谐，以确定在基础刷新频率下的不同灰阶的伽马电压和非基础刷新频率下的不同灰阶的伽马电压并计算它们之间的差值Δy。LTPO显示模组上的每个像素，均由不同亮度层次的红色(R)分量、绿色(G)分量、蓝色(B)分量组合得到，即屏幕上每一个像素点的色彩变化都是由构成该像素点的三个RGB子像素的灰阶变化造成。因此，可以分别计算在R分量、G分量和B分量上的差值Δy。
如图5所示，在120Hz的基础刷新频率下和30Hz的非基础刷新频率下的不同灰阶的伽马电压值差异存在关联关系。在图5中，横轴表示灰阶，纵轴表示在120Hz的基础刷新频率下的不同灰阶的伽马电压值与在30Hz的非 基础刷新频率下的对应灰阶的伽马电压值之间的差异Δy，并且三条曲线分别表示不同的DBV。具体地，图5A左侧的图示出了在不同DBV(DBV1、DBV2、DBV3)下在120Hz的基础刷新频率下的不同灰阶的R分量的伽马电压和30Hz的非基础刷新频率下的对应灰阶的R分量的伽马电压之间的差值；中间的图示出了在不同DBV下在120Hz下的不同灰阶的G分量的伽马电压和30Hz下的不同灰阶的G分量的伽马电压之间的差值；以及右侧的图示出了在不同DBV下在120Hz下的不同灰阶的B分量的伽马电压和30Hz下的不同灰阶的B分量的伽马电压之间的差值。
参考图5可以看出，在不同DBV下在120Hz的基础刷新频率下的不同灰阶的R、G、B分量的伽马电压和30Hz的非基础刷新频率下的不同灰阶的R、G、B分量的伽马电压之间的差值具有明显的数学关系，其可以由如下多项式表征：
Δy＝ax 2+bx+c
其中，Δy表示在基础刷新频率下的不同灰阶的伽马电压与非基础刷新频率下的不同灰阶的伽马电压之间的差值，x表示灰阶，a、b、c分别为多项式的系数。
所建立的多项式关系和相应的多项式系数可以被预先存储在IC中。此外，在基础刷新频率120Hz下的不同灰阶的伽马电压也可以被预先存储在IC中。通过调用多项式关系和与基础刷新频率的不同灰阶的伽马电压有关的数据，可以计算得到非基础刷新频率下的不同灰阶的伽马电压，计算公式如下：
Y＝y+Δy
其中，y表示在基础刷新频率下的不同灰阶的伽马电压，Y表示在非基础刷新频率下的对应灰阶的伽马电压。
然而，为了节省IC中的存储空间，并非与所有非基础刷新频率的多项式系数a、b、c都被存储在IC中。在一些实施例中，可以对多个非基础刷新频率的多项式系数进行绑点，并将绑点系数存储到IC中，其中，多个绑点系数可以由分段线性函数表征。
在一个示例中，可以分别确定多个非基础刷新频率的多项式系数a、b、c并从中选择多个系数进行绑点。以系数a为例，首先获得多个非基础刷新频率的多个系数a1、a2、…、a20。在多个系数a1、a2、…、a6中，由
a1和a5确定的线性函数上的点可以较好地覆盖a1和a5中间的各个系数a，因此，a1和a5可以被选择为绑点系数a。类似地，可以以同样的方式确定出其他若干个绑点系数a。
图8A是实现根据本公开实施例的调节LTPO显示模组的伽马电压的方法的显示装置。
如图8A所示，该显示装置包括存储器和与存储器耦合的处理器，该处理器被配置为：获取显示装置在基础刷新频率下的伽马电压；获取显示装置在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系；以及基于显示装置在基础刷新频率下的伽马电压和关联关系来确定所述显示装置在目标刷新频率下的伽马电压。
在一些实施例中，该关联关系是比例关系，该比例关系可以由Y＝αy表征，并且其中，Y表示在目标刷新频率下的一个灰阶的伽马电压，y表示在基础刷新频率下的该灰阶的伽马电压，以及α表示伽马比率。
在一些实施例中，该关联关系是多项式关系，该多项式关系可以由Δy＝ax 2+bx+c表征，其中，Δy表示在基础刷新频率下一个灰阶的伽马电压和在目标刷新频率下该灰阶的伽马电压之间的差值，x表示灰阶，并且a、b和c为多项式系数。
图8B是实现根据本公开实施例的调节LTPO显示模组的伽马电压的方法的显示设备。
如图8B所示，该显示设备包括存储部件、获取部件和伽马电压确定部件。
存储部件被配置为存储显示设备在基础刷新频率下的伽马电压和显示设备在基础刷新频率下的伽马电压和在目标基础刷新频率下的伽马电压之间的关联关系。
获取部件被配置为获取存储在存储部件中的显示设备在在基础刷新频率下的伽马电压以及显示设备在基础刷新频率下的伽马电压和在目标基础刷新频率下的伽马电压之间的关联关系。
伽马电压确定部件被配置为基于获取的显示设备在基础刷新频率下的伽马电压和关联关系来确定显示设备在目标基础刷新频率下的伽马电压。
图9是应用根据本公开实施例的调节LTPO显示模组的伽马电压的方法以改善VRR效果的实测效果图。在图9中分别示出了不同DBV下在不同刷 新频率下的伽马曲线。具体地，图9左侧的图示出了DBV为500尼特时在不同刷新频率(120Hz、60Hz、30Hz和10Hz)下的伽马曲线；中间的图示出了DBV为80尼特时在不同刷新频率(120Hz、60Hz、30Hz和10Hz)下的伽马曲线；并且右侧的图示出了DBV为25尼特时在不同刷新频率(120Hz、60Hz、30Hz和10Hz)下的伽马曲线。
参考图9，相同DBV下在不同刷新频率(120Hz、60Hz、30Hz和10Hz)下的伽马曲线几乎重合，这表明对于相同DBV，每个灰阶在不同刷新频率下的实际发光亮度保持不变。在图9中，nits为亮度单位尼特。
通过实施本发明提供的方法，能够实现为LTPO显示模组的在不同刷新频率下的不同灰阶分配不同的伽马电压，从而有效改善不同灰阶在不同DBV下在高刷新频率和低刷新频率之间切换过程中的亮度及色度差异。
以上所述，仅为本发明的具体实施方式，但本发明的保护范围并不局限于此，任何熟悉本技术领域的技术人员在本发明揭露的技术范围内，可轻易想到变化或替换，都应涵盖在本发明的保护范围之内。因此，本发明的保护范围应所述以权利要求的保护范围为准。

Claims (18)

  1. 一种用于调节显示模组的伽马电压的方法，包括：
    获取所述显示模组在基础刷新频率下的伽马电压；
    获取所述显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系；以及
    基于所述显示模组在基础刷新频率下的伽马电压和所述关联关系来确定所述显示模组在目标刷新频率下的伽马电压。
  2. 根据权利要求1所述的方法，其中，所述关联关系与所述显示模组的显示亮度值相对应，不同显示亮度值具有与其相对应的关联关系。
  3. 根据权利要求2所述的方法，还包括：确定所述显示模组的当前显示亮度值；
    其中，所述获取所述显示模组在基础刷新频率下的伽马电压包括：
    获取在当前显示亮度值下所述显示模组在基础刷新频率下的伽马电压，以及
    其中，所述获取所述显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系包括：
    获取在当前显示亮度值下所述显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系。
  4. 根据权利要求3所述的方法，其中，所述关联关系包括比例关系，并且所述获取在当前显示亮度值下所述显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系包括：对于多个灰阶中的每个灰阶，
    获取在当前显示亮度值下在基础刷新频率下所述灰阶的伽马电压与在目标刷新频率下所述灰阶的伽马电压之间的比例关系。
  5. 根据权利要求4所述的方法，其中，所述比例关系由Y＝αy表征，并且其中，Y表示在目标刷新频率下的一个灰阶的伽马电压，y表示在基础刷新频率下的该灰阶的伽马电压，以及α表示伽马比率。
  6. 根据权利要求4所述的方法，其中，所述比例关系为伽马比率，所述获取在当前显示亮度值下所述显示模组在基础刷新频率下所述灰阶的伽马电压与在目标刷新频率下所述灰阶的伽马电压之间的比例关系，包括：
    获取多个灰阶中的至少两个特定灰阶的伽马比率，其中，所述伽马比率指示在当前显示亮度值下所述显示模组在基础刷新频率下灰阶的伽马电压与在目标刷新频率下对应灰阶的伽马电压之间的比率；以及
    基于所述至少两个特定灰阶的伽马比率进行插值，以获得多个灰阶中的每个灰阶的伽马比率。
  7. 根据权利要求4所述的方法，其中，所述比例关系为伽马比率，并且所述获取在当前显示亮度值下在基础刷新频率下所述灰阶的伽马电压与在目标刷新频率下所述灰阶的伽马电压之间的比例关系，包括：对于多个灰阶中的每个灰阶，
    在所述基础刷新频率和多个非基础刷新频率中，确定与所述目标刷新频率接近的至少两个非基础刷新频率，
    对于所述至少两个非基础刷新频率中的每个非基础刷新频率，获得该非基础刷新频率的伽马比率，其中，所述伽马比率指示在当前显示亮度值下所述显示模组在基础刷新频率下该灰阶的伽马电压与在该非基础刷新频率下对应灰阶的伽马电压之间的比率；以及
    基于所述至少两个非基础刷新频率中的各非基础刷新频率的伽马比率进行插值，以获得所述目标刷新频率的伽马比率。
  8. 根据权利要求4所述的方法，其中，基于所述显示模组在基础刷新频率下的伽马电压和所述关联关系来确定所述显示模组在目标刷新频率下的伽马电压，包括：
    在显示模组的当前显示亮度值下，对于多个灰阶中的每个灰阶，基于在基础刷新频率下所述灰阶的伽马电压和在基础刷新频率下所述灰阶的伽马电压与在目标刷新频率下所述灰阶的伽马电压之间的比例关系的乘积，确定所述目标刷新频率下所述灰阶的伽马电压。
  9. 根据权利要求3所述的方法，其中，所述关联关系包括多项式关系，并且所述获取在当前显示亮度值下所述显示模组在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系包括：
    获取用于表征在当前显示亮度值下所述显示模组在基础刷新频率下各灰阶的伽马电压和在目标刷新频率下各对应灰阶的伽马电压之间的电压关系曲线的多项式的多个系数。
  10. 根据权利要求9所述的方法，其中，所述多项式关系由Δy＝ax 2+ bx+c表征，并且其中，Δy表示在基础刷新频率下一个灰阶的伽马电压和在目标刷新频率下该灰阶的伽马电压之间的差值，x表示灰阶，并且a、b和c为多项式系数。
  11. 根据权利要求9所述的方法，其中，基于所述显示模组在基础刷新频率下的伽马电压和所述关联关系来确定所述显示模组在目标刷新频率下的伽马电压，包括：
    在显示模组的当前显示亮度值下，基于基础刷新频率下多个灰阶中各灰阶的伽马电压和所述多个系数，确定在目标刷新频率下各灰阶的伽马电压。
  12. 一种用于确定显示模组的伽马电压之间的关联关系的方法，包括：
    测量所述显示模组在基础刷新频率下的伽马电压；
    测量所述显示模组在一个或多个非基础刷新频率下的伽马电压；以及
    基于所述显示模组在基础刷新频率下的伽马电压和在一个或多个非基础刷新频率下的伽马电压来确定所述显示模组的伽马电压之间的关联关系。
  13. 根据权利要求12所述的方法，其中，所述关联关系与所述显示模组的显示亮度值相对应，不同显示亮度值具有与其相对应的关联关系。
  14. 根据权利要求13所述的方法，还包括：测量所述显示模组的当前显示亮度值；
    其中，所述测量所述显示模组在基础刷新频率下的伽马电压包括：
    测量在当前显示亮度值下所述显示模组在基础刷新频率下的多个灰阶的伽马电压，以及
    其中，所述测量所述显示模组在一个或多个非基础刷新频率下的伽马电压包括：对于一个或多个非基础刷新频率中的每个非基础刷新频率，
    测量在当前显示亮度值下所述显示模组在该非基础刷新频率下的多个灰阶的伽马电压。
  15. 根据权利要求14所述的方法，其中，所述关联关系包括比例关系，并且基于所述显示模组在基础刷新频率下的伽马电压和在一个或多个非基础刷新频率下的伽马电压来确定所述显示模组的伽马电压之间的关联关系包括：对于一个或多个非基础刷新频率中的每个非基础刷新频率；
    确定指示在当前显示亮度值下在基础刷新频率下多个灰阶的伽马电压与在所述非基础刷新频率下各对应灰阶的伽马电压之间的比率的伽马比率。
  16. 根据权利要求14所述的方法，其中，所述关联关系包括比例关系， 基于所述显示模组在基础刷新频率下的伽马电压和在一个或多个非基础刷新频率下的伽马电压来确定所述显示模组的伽马电压之间的关联关系包括：对于多个灰阶中的每个灰阶，
    确定指示在当前显示亮度值下在基础刷新频率下所述灰阶的伽马电压与在一个或多个非基础刷新频率下所述灰阶的伽马电压之间的比率的伽马比率。
  17. 根据权利要求13所述的方法，其中，所述关联关系包括多项式关系，并且确定在当前显示亮度值下在基础刷新频率下多个灰阶中的每个灰阶的伽马电压与在一个或多个非基础刷新频率下多个灰阶中的每个灰阶的伽马电压之间包括：
    确定用于表征在当前显示亮度值下所述显示模组在基础刷新频率下多个灰阶的伽马电压和在一个或多个非基础刷新频率下多个对应灰阶的伽马电压之间的电压关系曲线的多项式的多个系数。
  18. 一种显示装置，包括：
    存储器；以及
    处理器，与所述存储器耦合并且被配置为：
    获取所述显示装置在基础刷新频率下的伽马电压；
    获取所述显示装置在基础刷新频率下的伽马电压和在目标刷新频率下的伽马电压之间的关联关系；以及
    基于所述显示装置在基础刷新频率下的伽马电压和所述关联关系来确定所述显示装置在目标刷新频率下的伽马电压。
PCT/CN2022/123005 2022-09-30 2022-09-30 调节显示模组的伽马电压的方法 Ceased WO2024065574A1 (zh)

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