EP1624438A1 - Procédé et appareil pour contrôle du niveau de puissance et/ou du contraste d'un dispositif d'affichage - Google Patents

Procédé et appareil pour contrôle du niveau de puissance et/ou du contraste d'un dispositif d'affichage Download PDF

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Publication number
EP1624438A1
EP1624438A1 EP05106877A EP05106877A EP1624438A1 EP 1624438 A1 EP1624438 A1 EP 1624438A1 EP 05106877 A EP05106877 A EP 05106877A EP 05106877 A EP05106877 A EP 05106877A EP 1624438 A1 EP1624438 A1 EP 1624438A1
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EP
European Patent Office
Prior art keywords
picture
signal
display device
intensity
reference signals
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Granted
Application number
EP05106877A
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German (de)
English (en)
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EP1624438B1 (fr
Inventor
Sebastien Weitbruch
Dennis Cota
Philippe Le Roy
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Thomson Licensing SAS
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Thomson Licensing SAS
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Priority claimed from EP04291945A external-priority patent/EP1622119A1/fr
Application filed by Thomson Licensing SAS filed Critical Thomson Licensing SAS
Priority to EP05106877A priority Critical patent/EP1624438B1/fr
Publication of EP1624438A1 publication Critical patent/EP1624438A1/fr
Application granted granted Critical
Publication of EP1624438B1 publication Critical patent/EP1624438B1/fr
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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
    • G09G3/22—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
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • 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
    • G09G2320/066—Adjustment of display parameters for control of contrast
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to a method and an apparatus for controlling the power level and/or the contrast in a display device having a plurality of luminous elements corresponding to the colour components of the pixels of a picture, wherein the luminance generated by each of said luminous element is based on the intensity of the signal supplied to the luminous element.
  • the invention is closely related to organic light emitting displays (OLED).
  • a high peak-white luminance is always required to achieve a good contrast ratio in every display technologies even with ambient light conditions and, for every kind of active displays, more peak white luminance corresponds to a higher power that flows in the electronic of the display. Therefore, if no specific management is done, the enhancement of the peak luminance for a given electronic efficacy will introduce an increase of the power consumption.
  • the power management is based on a so called ABL function (Average Beam-current Limiter), which is implemented by analog means and which decreases video gain as a function of the average luminance of the pictures.
  • ABL function Average Beam-current Limiter
  • OLED display In the case of an organic light-emitting diode display, also called OLED display, the luminance as well as the power consumption is directly linked to the current that flows through each cell. Currently, there is no power level control means for stabilizing the power consumption to a target value.
  • the contrast is adjusted by a video scaler acting on the video signal. If the video signal is coded on 8 bits and if the contrast should be reduced by 50%, the video signal is rescaled leading to a video signal with only a 7 bit resolution. So, there is a loss of video resolution.
  • the present invention proposes a new method and apparatus for controlling the power level and/or the contrast in display devices having a plurality of luminous elements, wherein the luminance generated by each of said luminous element is based on the intensity of the signal supplied to the luminous element and the power level and/or contrast for each picture is controlled by adjusting the intensity of the signal to be supplied to each luminous element.
  • the basic idea of this invention is to supply the luminous elements of the display device with a signal whose intensity is based on reference signals and to modify the level of these reference signals for adjusting the intensity of the signals supplied to the luminous elements.
  • the invention relates to a method for controlling the power level and/or the contrast in a display device having a plurality of luminous elements corresponding to the colour components of the pixels of a picture, wherein the luminance generated by each of said luminous elements is based on the intensity of the signal supplied to the luminous element and the power level and/or contrast for each picture is controlled by adjusting the intensity of the signal to be supplied to each luminous element, characterized in that the intensity of the signal to be supplied to each luminous element is based on reference signals and in that the adjustment of the signal intensity is made by adjusting the level of the reference signals.
  • the method further comprises the two following steps :
  • the method further comprises the following steps :
  • the apparatus further comprises calculation means for calculating, for each picture received by the display device, a parameter representative of the power needed by the display device for displaying said picture, and in that the adjustment means adjusts the level of the reference signals in order that the power needed by the display device for displaying each picture is lower than a target value.
  • the calculation means calculates for example, for each picture received by the display device, the average power level of said picture.
  • the apparatus further comprises calculation means for calculating an adjustment factor to be applied to the intensity of the signal supplied to the luminous elements in order that the resulting contrast is equal to a required contrast, and in that the adjustment means applies said adjustment factor to said reference signals.
  • the apparatus comprises a frame memory for storing a picture before transmitting it to the display device.
  • the adjustment means of the apparatus comprises means for applying a non linear transformation to reference signals in order to increase the amplitude of the low-amplitude reference signals and the apparatus comprises means for applying the inverse transformation to the picture signal.
  • the invention concerns also a display device comprising
  • the invention is described in relation to a OLED display with an active matrix where each luminous element of the display is controlled via an association of several thin-film transistors (TFTs).
  • TFTs thin-film transistors
  • the column driver 3 represents, with the digital processing and driving unit 4, the real active part of the electronic and can be considered as a high-level digital to analog converter.
  • the row driver 2 has a quite simple function since it only has to apply a selection line by line. It is more or less a shift register.
  • the input video signal is forwarded to the digital processing and driving unit 4 that delivers, after internal processing, a timing signal for row selection to the row driver 2 synchronized with the data sent to the column driver 3.
  • the data are sent either in a parallel way or in a serial way.
  • the column driver 3 is equipped with a reference signaling device 5 for delivering reference signals. More precisely, this device delivers a set of reference voltages in case of voltage driven circuitry or a set of reference currents in case of current driven circuitry, the highest reference being used for the highest gray level (white) and the lowest for the smallest gray level. These reference signals are used by the column driver 3 for generating the signal to be supplied to the OLED element.
  • the different gray levels can be defined as given by the following table.
  • the whole table is given by the annex 1.
  • gray level gray level voltage Gray level voltage 0 V7 0.00V 1 V7+(V6-V7)x9/1175 0.001V 2 V7+(V6-V7)x32/1175 0.005V 3 V7+(V6-V7)x76/1175 0.011V 4 V7+(V6-V7)x141/1175 0.02V 5 V7+(V6-V7)x224/1175 0.032V 6 V7+(V6-V7)x321/1175 0.045V 7 V7+(V6-V7)x425/1175 0.06V 8 V7+(V6-V7)x529/1175 0.074V 9 V7+(V6-V7)x630/1175 0.089V 10 V7+(V6-V7)x727/1175 0.102V 11 V7+(V6-V7)x820/1175 0.115V 12 V7+(V6-V7)x
  • This current value can be considered as too high. For example, it is sought a maximum current value of 80mA.
  • the luminance of the display panel is adjusted in order that the current value necessary for displaying the picture is lower than a maximum current value.
  • the power of the incoming picture is first evaluated and the luminance of the panel is then adjusted in order to limit the power consumption of the panel to the maximum current value.
  • a first step of the inventive method consists in evaluating the power of the incoming picture to decide which luminance should be used for a white level.
  • the APL value of a picture will be expressed as a percentage of white surface in the picture for clarity and simplicity reasons.
  • the maximal luminance of the screen is determined for different percentages of white surface as shown in the following table.
  • the power consumption for the picture with a white surface percentage inferior to 22 % is inferior to 80 mA.
  • the maximal contrast ratio is obtained for a 22% white surface percentage and is equal to 4.5.
  • the luminance of the screen is adjusted by modifying the value of the reference levels Vn, n ⁇ [0,...,7] defined above.
  • Vn ( APL ) V 0 ( APL ) ⁇ Vn ( 0 % ) V 0 ( 0 % )
  • Figure 3 shows curves illustrating this table and showing the variations of the reference voltages for the percentages of white surface 5%, 10%, 30%, 40%, 50%, 60%, 70%, 80%, 90% and 100%.
  • the voltage values below 0.16V can create a precision error.
  • the voltage values for the reference voltage V0 is kept constant while the other ones are modified by a non-linear mathematical transformation f(x,y,z) as followed:
  • Vn ( APL ) f ( V 0 ( APL ) ; Vn ( 0 % ) ; V 0 ( 0 % ) ) .
  • Figure 4 to be compared with Figure 3, illustrates these new variations of voltage references V0 to V7 by curves. After this transformation, there are almost no more differences for the reference voltages V6 and V7 between the different APL values.
  • This non linear transformation f applied to the reference voltages V1 to V7 should be compensated by an inverse transformation f -1 in the video signal processing chain of the device.
  • f and f -1 it is possible to obtain an optimized power management without introducing too much difficulties in the low level gradations (low voltages/low currents).
  • a circuit implementation of the digital processing and driving unit 4 to be used the power level control method of the invention is given at figure 5.
  • An input picture is forwarded to a power evaluation block 41 that performs the computation of the APL level of the input picture.
  • the APL value is transmitted to a power management block 42. Since the result of this computation can be only made after a complete frame, the input picture should be then stored in a frame memory 43, for example a DDRAM, in order to dispose of one frame delay.
  • This memory can be inside or outside the unit 4.
  • an appropriate set of reference signals Refn is chosen for instance from a Look Up Table and sent to the Reference Signaling Unit 5 via a programming bus.
  • a non-linear transformation f is integrated in these signals.
  • these reference signals can be reference voltages or reference currents. This programming should occur during the vertical blanking in order not to disturb the displayed picture.
  • a non-linear transfer function f -1 (it can be a mathematical function or a Look Up Table) which is the inverse of the transformation integrated in the chosen set of reference signals Refn is chosen and is applied to the delayed picture by a block 44.
  • the picture after processing is sent to a standard OLED processing block 45 and then to a standard OLED driving block 46 for finally driving the display with the current picture information.
  • the method of the invention can be used for controlling the contrast of the pictures displayed by the display device.
  • the method consists in calculating an adjustment factor that is to be applied to the intensity of the signal supplied to the luminous elements in order to make the contrast go from a present value to a required value. This adjustment factor is then applied to the reference signals.
  • the reference signals are decreased from 50%.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
EP05106877A 2004-07-29 2005-07-26 Procédé et appareil pour contrôle du niveau de puissance et/ou du contraste d'un dispositif d'affichage Expired - Lifetime EP1624438B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP05106877A EP1624438B1 (fr) 2004-07-29 2005-07-26 Procédé et appareil pour contrôle du niveau de puissance et/ou du contraste d'un dispositif d'affichage

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP04291945A EP1622119A1 (fr) 2004-07-29 2004-07-29 Procédé et appareil pour contrôle du niveau de puissance et/ou du contraste d'un dispositif d'affichage
EP05106877A EP1624438B1 (fr) 2004-07-29 2005-07-26 Procédé et appareil pour contrôle du niveau de puissance et/ou du contraste d'un dispositif d'affichage

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EP1624438A1 true EP1624438A1 (fr) 2006-02-08
EP1624438B1 EP1624438B1 (fr) 2010-09-22

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1895495A1 (fr) * 2006-08-31 2008-03-05 Samsung SDI Co., Ltd. Dispositif d'affichage électroluminescent organique et son procédé de commande

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1164562A2 (fr) * 2000-03-08 2001-12-19 Fujitsu Hitachi Plasma Display Limited Procédé et appareil pour la correction de l'équilibre du blanc pour dispositif d'affichage
JP2002182612A (ja) * 2000-12-11 2002-06-26 Sony Corp 画像表示装置
EP1310935A2 (fr) * 2001-11-08 2003-05-14 Canon Kabushiki Kaisha Méthode et appareil de commande d'affichage d'image
US20030218583A1 (en) * 2002-02-04 2003-11-27 Hiroshi Hasagawa Organic EL display apparatus and method of controlling the same

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4423848B2 (ja) * 2002-10-31 2010-03-03 ソニー株式会社 画像表示装置、および、その色バランス調整方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1164562A2 (fr) * 2000-03-08 2001-12-19 Fujitsu Hitachi Plasma Display Limited Procédé et appareil pour la correction de l'équilibre du blanc pour dispositif d'affichage
JP2002182612A (ja) * 2000-12-11 2002-06-26 Sony Corp 画像表示装置
EP1310935A2 (fr) * 2001-11-08 2003-05-14 Canon Kabushiki Kaisha Méthode et appareil de commande d'affichage d'image
US20030218583A1 (en) * 2002-02-04 2003-11-27 Hiroshi Hasagawa Organic EL display apparatus and method of controlling the same

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2002, no. 10 10 October 2002 (2002-10-10) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1895495A1 (fr) * 2006-08-31 2008-03-05 Samsung SDI Co., Ltd. Dispositif d'affichage électroluminescent organique et son procédé de commande

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EP1624438B1 (fr) 2010-09-22

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