WO2017113678A1 - 一种驱动装置、驱动方法和显示装置 - Google Patents

一种驱动装置、驱动方法和显示装置 Download PDF

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Publication number
WO2017113678A1
WO2017113678A1 PCT/CN2016/088370 CN2016088370W WO2017113678A1 WO 2017113678 A1 WO2017113678 A1 WO 2017113678A1 CN 2016088370 W CN2016088370 W CN 2016088370W WO 2017113678 A1 WO2017113678 A1 WO 2017113678A1
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Prior art keywords
driving
level
signal
emitting element
voltage
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PCT/CN2016/088370
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English (en)
French (fr)
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殷新社
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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Priority to US15/502,274 priority Critical patent/US10319295B2/en
Priority to EP23158393.1A priority patent/EP4213140A1/en
Priority to EP16831883.0A priority patent/EP3208794B1/en
Publication of WO2017113678A1 publication Critical patent/WO2017113678A1/zh
Anticipated expiration legal-status Critical
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    • 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]
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Definitions

  • the present invention relates to display technology, and more particularly to a driving device, a driving method, and a display device capable of controlling ON/OFF of a light-emitting element by using a multi-level control signal to improve accuracy of a driving current, thereby improving display quality.
  • AMOLED Active Matrix Organic Light Emitting Diode
  • LCD liquid crystal display
  • OLED Organic Light Emitting Diode
  • OLED displays in mobile phones, PDAs, digital cameras and other display fields have begun to replace traditional LCD displays.
  • pixel driving is the core technical content of AMOLED display, which has important research significance.
  • the conventional AMOLED pixel driving circuit uses a 2T1C pixel driving circuit.
  • the circuit consists of only one driving thin film transistor DTFT, one switching thin film transistor T1 and one storage capacitor C.
  • the organic light emitting diode OLED is connected in series with the DTFT to the driving power supply voltage ELVDD, and the gate of the DTFT is connected to the data line supplying the data signal Vdata through the switching thin film transistor T1.
  • a scan line is connected to the gate of the switching thin film transistor T1 to gate the row.
  • Fig. 2 is a timing chart showing the operation of the pixel driving circuit shown in Fig. 1, showing the timing relationship of the scanning signal supplied from the scanning line and the data signal supplied from the data line.
  • the scan signal Gate(n) is a low level signal, T1 is turned on, and the data signal Vdata is written to the storage capacitor C.
  • the gate voltage stored on the storage capacitor C drives the DTFT to generate a current to drive the OLED to cause the OLED to emit light.
  • the current through the DTFT is
  • V GS is the gate-source voltage of the DTFT
  • V TH is the threshold voltage of the DTFT
  • C OX is the capacitance of the DTFT oxide layer
  • W and L are the channel width and length of the DTFT, respectively
  • ⁇ is the mobility
  • V GS V data -ELV DD .
  • FIG. 3 shows the relationship between the driving current and the luminance of the organic light emitting diode. As can be seen from FIG. 3, the luminance of the organic light emitting diode increases as the current density increases, and becomes darker as the current density decreases.
  • the current range provided to the OLED is 0 ⁇ 20000cd / m2 display
  • the drive current range is 0 ⁇ 37mA / cm2
  • the drive current is required to be reduced, and the power consumption is reduced.
  • the same gray scale level (8 bits is 256 gray scale level)
  • the present disclosure proposes a driving device, a driving method, and a display device capable of dividing a light emitting element light emitting phase into at least two sub-phases, that is, providing a two-level driving level in a light emitting phase of the light emitting element, one level making The illuminating element emits light normally, while the other level causes the illuminating element to not emit light.
  • the drive current of the light-emitting element at the time of light emission is increased by reducing the duty ratio of the two levels, thereby improving the accuracy of the drive current.
  • a driving apparatus for driving a light emitting element, comprising: a source driving circuit for generating a line scan signal and a data signal required to drive the light emitting element, wherein during the period when the line scan signal is valid, Writing a data signal to the driving control circuit of the light emitting element; driving the control circuit to write the parameter of the driving element of the light emitting element while writing the data signal while the line scanning signal is active; wherein the driving control circuit further receives the level Controlling a signal, and providing a driving voltage to the driving element according to a data signal, a parameter of the driving element, and a level control signal in a light emitting phase of the light emitting element; and driving the component to convert a driving voltage provided by the driving control circuit into a driving current And provided to the light emitting element such that the light emitting element emits light under the driving current provided by the driving element.
  • the level control signal is configured to include a high level and a low level, one of the high level and the low level such that the driving voltage is insufficient to drive the driving element, and the high level and the low level Another level in the level causes the drive control circuit to provide a drive voltage to the drive element based on the data signal and the parameters of the drive element to cause the light-emitting element to illuminate.
  • the level control signal is a power signal of the light emitting element
  • the driving control circuit supplies a driving voltage to the driving element according to the data signal and the parameter of the driving element when the level control signal is at a high level, and drives the light emitting element by the driving element
  • the light-emitting element is caused to emit light; the driving voltage supplied when the level control signal is at a low level cannot drive the driving element, so that the light-emitting element does not emit light.
  • a high-level power supply signal and a low-level power supply signal are generated by a voltage selector; wherein the voltage selector includes a high-level voltage power supply that outputs a high-level power supply signal and a low-level power supply a low-level voltage power supply of the signal; the voltage selector receives the selection signal, and selects a power supply signal that outputs one of a high level and a low level according to the selection signal.
  • a power supply signal that causes the light emitting element to normally emit light is set to one of the high level power supply signal and the low level power supply signal; the high level power supply signal and the low level power supply signal The other is set such that when the power signal is applied, the drive elements are in an off state under all data signals.
  • the selection signal is generated by the source drive circuit or an external circuit.
  • the voltage selector is included in the source drive circuit.
  • the level control signal is input to a control terminal of the driving element, wherein a level control signal of one of a high level and a low level causes the driving element to be normally driven; a high level and a low level Another level of the level control signal in the drive element is in an off state or in a microconduction state.
  • the level control signal is generated by an active drive circuit or an external circuit.
  • the level control signal is synchronized with the line scan signal.
  • the duty ratio of the high and low levels of the level control signal is adjustable.
  • the voltage selector includes: a first transistor, a gate receiving a selection signal of the driving voltage control circuit, a source receiving the high-level power signal, and a drain connected to a gate of the second transistor; a second transistor, the source receives the high-level power signal, and the drain is connected to the output terminal; the first resistor has one end connected to the gate of the second transistor and the other end grounded; the third transistor is connected to the fourth terminal a source of the transistor, the source receives the low-level power signal, and the drain is connected to the output terminal; the fourth transistor receives a selection signal of the driving voltage control circuit, and the drain is grounded; and the second resistor is connected at one end To the source of the third transistor, the other end is connected to the gate of the third transistor.
  • a driving method of a light emitting element for driving a device comprising: providing a line scan signal on a line scan line; providing a data signal on the data line; providing level control a signal; during the period in which the line scan signal is valid, the parameters of the driving element of the light emitting element are written into the driving control circuit while the data signal is being written; in the lighting stage of the light emitting element, according to the data signal, the parameters and level control of the driving element a signal that provides a drive voltage to the drive element.
  • the level control signal is configured to include a high level and a low level, one of the high level and the low level such that the driving voltage is insufficient to drive the driving element, and the high level and the low level Another level in the level is such that a driving voltage is supplied to the driving element in accordance with the data signal and the parameters of the driving element to cause the light emitting element to emit light.
  • the level control signal is a power signal of the light emitting element.
  • the level control signal is applied to a control terminal of the driving element, wherein a level control signal of one of a high level and a low level causes the driving element to be normally driven; in the high level and the low level Another level of level control signal causes the drive element to be in an off state or in a microconduction state.
  • the level control signal is synchronized with the line scan signal.
  • a display device comprising a driving device according to the present disclosure; And the light-emitting element emits light according to a driving current supplied from the driving device.
  • FIG. 1 is a schematic structural view of a pixel driving circuit in the prior art
  • FIG. 3 is a view showing a relationship between driving current and brightness of an OLED
  • FIG. 4 is a schematic structural view of a conventional display device
  • FIG. 5 is an operation timing chart of a driving device in a conventional display device
  • FIG. 6 is a schematic structural view of a driving device according to an embodiment of the present invention.
  • FIG. 7 is a schematic structural diagram of a display device according to an embodiment of the present invention.
  • FIG. 8 is an operation timing chart of a driving device in a display device according to an embodiment of the present invention.
  • Figure 9 shows a schematic diagram of a voltage selector in accordance with an embodiment of the present invention.
  • FIG. 10 is a block diagram showing the structure of a display device according to still another embodiment of the present invention.
  • Figure 11 is a view showing the structure of a display device of an 8.4-inch flat panel
  • FIG. 12 is a timing chart showing the operation of the driving device in the display device shown in FIG. 11;
  • FIG. 13 is a schematic structural diagram of a display device according to an embodiment of the present invention.
  • FIG. 14 is an operation timing chart of a driving device in a display device according to an embodiment of the present invention.
  • FIG. 15 is a block diagram showing the structure of a display device according to still another embodiment of the present invention.
  • Fig. 16 is a timing chart showing the operation of the driving device in the display device shown in Fig. 15.
  • Fig. 17 is a flow chart showing a driving method of a driving device according to an embodiment of the present invention.
  • the display device includes a source driving circuit 400, a driving control circuit, a driving element, and a light emitting element arranged in a row b row * a column.
  • Fig. 5 is a timing chart showing the operation of the driving device in the conventional display device.
  • a PMOS transistor will be described as an example. That is, the low level is an active level.
  • the m-th row scanning signal Gm is low, the light-emitting elements of the entire row of m rows are selected, and at this time, a data signals S1-Sa are respectively written in the drive control circuits of the a-th light-emitting elements of m rows.
  • the m+1th row is turned on, and the same a data signals S1-Sa are respectively written into the drive control circuits of the a-th light-emitting elements of the m+1th row, and so on.
  • the drive control circuit supplies a drive voltage corresponding to the data signal to the drive element, and the drive element converts the drive voltage into a drive current to drive the light-emitting element.
  • ELV DD is a constant voltage.
  • FIG. 6 is a schematic structural view of a driving device 600 according to an embodiment of the present invention.
  • the driving device 600 includes: a source driving circuit 610 for generating a line scan signal and a data signal according to an input video signal; and a driving control circuit 620 for validating the line scanning signal During the writing of the data signal, the parameters of the driving element of the light emitting element are written; wherein the driving control circuit further receives the level control signal, and in the lighting stage of the light emitting element, according to the line scanning signal and data of the source driving circuit a signal and a level control signal to generate a driving voltage; and a driving element 630 for converting a driving voltage supplied from the driving control circuit into a driving current.
  • the 6 also shows a light-emitting element 640 that emits light according to a drive current provided by the drive device 600, specifically, according to a drive current provided by the drive element 630.
  • the level control signal is configured to include a high level and a low level, one of the high level and the low level such that the driving voltage is insufficient to drive the driving element, and the high level and the low level
  • Another level in the drive control circuit provides a drive voltage to the drive element based on the data signal and the parameters of the drive element, the drive voltage being capable of compensating for the parameters of the drive element and causing the illumination element to normally illuminate.
  • FIG. 7 is a schematic structural view of a display device according to an embodiment of the present invention.
  • the display device shown in Fig. 7 utilizes the drive device 600 according to the embodiment of the present invention as described in Fig. 6.
  • FIG. 8 is an operation timing chart of a driving device in a display device according to an embodiment of the present invention.
  • the display device is supplied with a high level voltage ELVH and a low level voltage ELVL, and a voltage selector is provided to the display device. That is, the level control signal is a power supply signal of the light emitting element.
  • the voltage selector receives a two-level signal, that is, a high-level power supply signal and a low-level power supply signal.
  • the source driving circuit 600 outputs a selection signal EL C to the voltage selector such that the voltage selector selectively outputs one of a high-level power supply signal and a low-level power supply signal.
  • the driving control circuit supplies a driving voltage to the driving element according to the data signal and the parameter of the driving element when the level control signal is a power signal of a high level, and drives the light emitting element by the driving element to cause the light emitting element to emit light; the level control signal is low
  • the driving voltage supplied at the level of the power signal cannot drive the driving element, so that the light emitting element does not emit light.
  • the selection signal EL C outputted by the source driving circuit is a pulse control signal having a duty ratio D, and the period of the pulse coincides with the period of the line scanning signal of the display device, and is within a period of one line scanning signal. It is divided into a high level and a low level, so that the voltage ELV DD of the power signal output by the voltage selector is also divided into a high level and a low level, respectively, which are represented as a light-emitting sub-phase and a non-light-emitting sub-phase of the light-emitting element.
  • the line scan signal Gm is adjusted such that its gate time is the same as the duration of the power signal of the high level. That is, the level control signal is synchronized with the line scan signal. Accordingly, the duty cycle of the high and low levels of EL C can be adjusted to achieve the desired drive current density, but the minimum duty cycle of EL C needs to ensure data write time.
  • the voltage selector is arranged outside of the source drive circuit.
  • a voltage selector can be included within the source drive circuit.
  • the voltage selector includes a high-level voltage power supply that outputs a high-level power supply signal and a low-level voltage power supply that outputs a low-level power supply signal.
  • the selection signal EL C is generated by the source drive circuit or an external circuit.
  • FIG. 9 shows a schematic diagram of a voltage selector in accordance with an embodiment of the present invention.
  • the voltage selector 900 includes: a first transistor T1, a gate receiving a selection signal of the driving voltage control circuit, a source receiving the power signal of the high level, and a drain connected to the second transistor T2.
  • a second transistor T2 the source receives the high-level power signal, and the drain is connected to the output terminal;
  • the first resistor R1 has one end connected to the gate of the second transistor T2 and one end grounded;
  • the third transistor T3, the gate is connected to the source of the fourth transistor T4, the source receives the low-level power signal, and the drain is connected to the output terminal;
  • the fourth transistor T4, the gate receives the selection signal of the driving voltage control circuit, and the drain
  • the second resistor R2 has one end connected to the source of the third transistor T3 and one end connected to the gate of the third transistor T3.
  • the selection signal EL C selects the high level signal EL VDDH , the transistors T1 and T4 are turned on, T3 is turned off, and T2 is turned on. Therefore, the output power signal voltage EL VDD is equal to the turn-on voltage of the EL VDDH -T1, and thus the output The voltage is approximately equal to the power signal of EL VDDH .
  • the selection signal EL C selects the low-level signal EL VDDL , T1 and T4 are turned off, T2 is turned off, T3 is turned on, and the output power signal voltage EL VDD is equal to the turn-on voltage of EL VDDL -T3, so the output voltage is approximately equal to EL VDDL power signal. Therefore, by controlling the selection signal EL C , it is possible to selectively output a power signal of a high level and a low level.
  • FIG. 10 is a block diagram showing the structure of a display device according to still another embodiment of the present invention.
  • a source driving circuit receives a power signal of a high level and a power signal of a low level, and selectively outputs a power signal of a high level to a driving element during a scan of each row.
  • One of the low-level power signals, the high-level power signal drives the light-emitting element to emit light, and the low-level power signal cannot drive the light-emitting element to emit light.
  • the density of the driving current can be adjusted, thereby improving the display quality.
  • Fig. 11 is a view showing the structure of a display device of an 8.4-inch flat panel.
  • Fig. 12 is a timing chart showing the operation of the driving device in the display device shown in Fig. 11.
  • the operation timing of the display device shown in FIG. 11 is as follows:
  • the drive control signal EM and the scan signal Gate are at a high level
  • the transistor T5 and the transistor T6 are turned off
  • the transistor T3 and the transistor T4 are also turned off
  • the reset signal Reset signal is at a low level
  • the capacitor C1 is passed through the transistor T7.
  • the transistor T1 is reset, that is, the voltage across the capacitor C1 is ELV DD and Vint, respectively.
  • the reset signal Reset and the scan signal Gate are both high level, T1, T7, T2 and T4 are turned off, and the driving control signal EM signal is low level, then T5 and T6 are turned on, and T3 is also turned on.
  • the ELV DD ' level is clamped to the N1 terminal of C1 through T5, and the N2 level becomes ELV DD '+ELV DD -V th -V data .
  • ELV DD 'function is to reduce the influence of the resistance drop, which is used as a reference level.
  • ELV DD is a single-level signal.
  • FIG. 13 is a schematic structural view of a display device according to an embodiment of the present invention.
  • the driving device of the display device according to an embodiment of the present invention further includes a reference voltage control circuit configured to generate a reference voltage of a high level and a reference voltage of a low level.
  • the reference voltage control circuit of the driving device is configured to generate a reference voltage of a high level and a reference voltage of a low level.
  • the drive control circuit is configured to provide a high/low level signal to the control terminal of the drive element based on the reference voltage.
  • a signal of one of the high level and the low level causes the driving element to be normally driven; the signal of the other level of the high level and the low level causes the driving element to be in an off state or in a micro conduction state.
  • a reference voltage of a high level and a reference voltage of a low level are generated by the reference voltage control circuit.
  • the general voltage amplitude can be adjusted by programming.
  • FIG. 14 is an operation timing chart of a driving device in a display device according to an embodiment of the present invention.
  • the drive control signal EM and the scan signal Gate are at a high level
  • the transistor T5 and the transistor T6 are turned off
  • the transistor T3 and the transistor T4 are also turned off
  • the reset signal Reset signal is at a low level
  • the capacitor C1 is passed through the transistor T7.
  • the transistor T1 is reset, that is, the voltage across the capacitor C1 is ELV DD and Vint, respectively.
  • the illuminating phase t3 includes an alternating illuminating sub-phase t4 and a non-illuminating sub-phase t5.
  • the reset signal Reset and the scan signal Gate are both high level, T1, T7, T2 and T4 are turned off, and the drive control signal EM signal is low level, then T5 and T6 are turned on, T3 is also turned on, and the level of Vref is passed.
  • T5 is clamped to the N1 terminal of C1, and the N2 level becomes Vref+ELV DD -V th -V data .
  • Vref is a low-level reference voltage VrefL, that is, a level at which T3 is normally turned on to cause the light-emitting element to emit light.
  • Vref becomes the reference voltage VrefH of the high level, and since the Vref level rises, the level of the N2 terminal of C also rises, so that T3 is turned off, and the light-emitting element does not emit light.
  • the luminance of the light-emitting element that is, the current density of the light-emitting element
  • the luminance of the light-emitting element can be adjusted by adjusting the duty ratios of VrefL and VrefH.
  • FIG. 15 is a block diagram showing the structure of a display device according to still another embodiment of the present invention.
  • a reference voltage of a high level and a reference voltage of a low level are generated by an external circuit.
  • a driving device includes a source driving circuit, a driving control circuit, a driving element, and a light emitting element.
  • the source driving circuit outputs a selection signal to a reference voltage control circuit that receives the reference voltage of the high level and the reference voltage of the low level, so that the reference voltage control circuit selectively outputs the reference voltage of the high level and the reference voltage of the low level One of them is to supply a driving voltage of a high level and a driving voltage of a low level by the driving control circuit.
  • Fig. 16 is a timing chart showing the operation of the driving device in the display device shown in Fig. 15.
  • the reference voltage selection circuit selectively outputs VrefH or VrefL according to the selection signal E on output from the source driving circuit.
  • FIG. 6 a driving device is shown in FIG. 6, a display device is shown in FIGS. 7, 10, 13, and 15, and a voltage selector is shown in FIG. 9, those skilled in the art can understand that these circuits,
  • the device can take on other configurations.
  • the driving device according to an embodiment of the present invention can be applied to a display device having other structures
  • the voltage selector according to an embodiment of the present invention can be applied to a driving device having other structures.
  • FIG. 9 shows that the structure of the voltage selector may not be limited to the illustrated structure.
  • Fig. 17 is a flow chart showing a driving method of a driving device according to an embodiment of the present invention.
  • a driving method of a driving apparatus includes: step S1710, providing a line scan signal on a line scan line; step S1720, providing a data signal on the data line; and step S1730, providing level control a signal; in step S1740, while the line scan signal is active, the parameter of the driving element of the light emitting element is written into the driving control circuit while the data signal is being written; in step S1750, in the light emitting stage of the light emitting element, according to the data signal, the driving element Parameters and level control signals to the drive element Provide drive voltage.
  • the level control signal is configured to include a high level and a low level, one of the high level and the low level such that the driving voltage is insufficient to drive the driving element, and the high level and the low level Another level in the level is such that a driving voltage is supplied to the driving element in accordance with the data signal and the parameters of the driving element to cause the light emitting element to emit light.
  • Steps S1710 to S1730 can be performed in parallel.
  • the row scan line is connected to the line scan signal source in advance
  • the data line is connected to the data source
  • the source of the level control signal is connected to the line of the level control signal.
  • steps S1710 to S1730 are performed to cause the display device to enter the data writing phase, that is, the line scan signal is valid while the data signal is written.
  • the parameters of the driving elements of the light-emitting elements are written to the drive control circuit.
  • the driving voltage is supplied to the driving element in accordance with the written data signal, the parameters of the driving element, and the level control signal in step S1750.
  • the level control signal may be a power signal of the light emitting element. That is, the drive control circuit supplies a drive voltage to the drive element according to the data signal and the parameters of the drive element when the level control signal is at a high level, and drives the light-emitting element through the drive element to cause the light-emitting element to emit light; when the level control signal is at a low level The provided driving voltage cannot drive the driving element, so that the light emitting element does not emit light.
  • a level control signal can be applied to the control terminal of the drive element.
  • the level control signal of one of the high level and the low level causes the driving element to drive normally; the level control signal of the other level of the high level and the low level causes the driving element to be in the off state or in the micro On state.
  • the level control signal is synchronized with the line scan signal. That is, the gate time of the line scan signal is the same as the duration of the power signal of the high level, so that the data signal is not written when the power signal is low.

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Abstract

一种驱动装置，用于驱动发光元件。通过将发光元件的发光阶段分为至少两个子阶段，即，增加一个两电平的电平控制信号，其中一个电平使发光元件（640）正常发光，另一个电平使发光元件（640）关断或者在极小电流下工作。通过调整该两个电平控制信号的占空比，可以调整发光元件（640）在发光时的驱动电流，实现对发光元件（640）的驱动电流的准确控制。以及驱动装置的驱动方法和包括驱动装置的显示装置。

Description

一种驱动装置、驱动方法和显示装置
本申请要求于2015年12月31日提交的、申请号为201511021518.4的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及显示技术，更具体地，涉及一种驱动装置、驱动方法和显示装置，能够利用多电平的控制信号控制发光元件的开/关，提高驱动电流的精度，从而提高显示质量。
背景技术
有源矩阵有机发光显示器(Active MatrixOrganic Light Emitting Diode，AMOLED)是当今平板显示器研究领域的热点之一，与液晶显示器(LCD)相比，有机发光二极管(Organic Light Emitting Diode，OLED)具有低能耗、生产成本低、自发光、宽视角及响应速度快等优点，目前，在手机、PDA、数码相机等显示领域OLED显示屏已经开始取代传统的LCD显示屏。其中，像素驱动是AMOLED显示器的核心技术内容，具有重要的研究意义。
与薄膜晶体管液晶显示器(Thin Film Transistor-Liquid Crystal Display，TFT-LCD)利用稳定的电压控制亮度不同，OLED属于电流驱动，需要稳定的电流来控制发光。如图1所示，传统的AMOLED像素驱动电路采用2T1C像素驱动电路。该电路只由1个驱动薄膜晶体管DTFT、一个开关薄膜晶体管T1和一个存储电容器C组成。有机发光二极管OLED与DTFT串联连接到驱动电源电压ELVDD，DTFT的栅极通过开关薄膜晶体管T1连接到提供数据信号Vdata的数据线。扫描线连接到开关薄膜晶体管T1的栅极，以对该行进行选通。图2示出了如图1所示的像素驱动电路的操作时序图，示出了扫描线提供的扫描信号和数据线提供的数据信号的时序关系。
当扫描线选通(即扫描)某一行时，在t1阶段，扫描信号Gate(n)为低电平信号，T1导通，数据信号Vdata写入存储电容器C。当该行扫描结束后，在t2阶段，Gate(n)转变为高电平信号，T1截止，存储在存储电容器C上的栅极电压驱动DTFT，使其产生电流来驱动OLED，使OLED发光。
根据驱动薄膜晶体管DTFT的特性，通过DTFT的电流为
Figure PCTCN2016088370-appb-000001
其中VGS是DTFT的栅-源电压，VTH是DTFT的阈值电压，COX是DTFT氧化层电容，W和L分别是DTFT的沟道宽度和长度，μ是迁移率，VGS＝Vdata-ELVDD。将VGS代入得到
Figure PCTCN2016088370-appb-000002
因此，在OLED的驱动电路中，驱动电流和源驱动电路输出的数据信号Vdata呈现二次函数关系。
图3示出了有机发光二极管的驱动电流与亮度之间的关系。从图3可以看出，有机发光二极管的亮度随着电流密度的增加而增加，并随着电流密度的减小而变暗。
对于一定亮度的OLED显示器，这就决定了向OLED提供的电流范围，如图3所示，亮度范围为0～20000cd/m2的显示器，采用EFF50EL材料时，驱动电流的范围为0～37mA/cm2，如果采用高效率的EFF80EL材料时只需要0～24mA/cm2。由此可见，随着材料效率提高，也就要求驱动电流降低，降低了功耗同时，同样灰阶等级(8比特为256灰阶等级)下，必须提高驱动电流的精度。
根据DTFT的驱动电流
Figure PCTCN2016088370-appb-000003
可知，驱动电流范围降低时，在DTFT的W/L比不变时要求Vdata的电压范围降低，这就要求源驱动电路输出的Vdata的电压精度提高。现在源驱动电路的电压输出的精度可以达到5mV/灰度等级。如果效率再提高一倍，需要达到3mV/灰度等级，这已经超过了源驱动电路的工艺能力。当然也可以通过减小DTFT的W/L值来降低Vdata的精度。但是随着分辨率的提高，像素空间有限的情况下，很难进一步增加DTFT的沟道长度。
因此，需要一种能够提高驱动电流的精度，从而提高显示质量的装置和方法。
发明内容
本公开提出了一种驱动装置、驱动方法和显示装置，能够通过将发光元件发光阶段分为至少两个子阶段，即在发光元件的发光阶段提供一个两电平的驱动电平，一个电平使得发光元件正常发光，而另一个电平使得发光元件不发光。在确保亮度不变的情况下，通过减少两个电平相对的占空比，提升发光元件在发光时的驱动电流，从而提高驱动电流的精度。
根据本发明的第一方面，提出了一种驱动装置，用于驱动发光元件，包括：源驱动电路，产生驱动发光元件所需的行扫描信号、数据信号，其中，在行扫描信号有效期间，向发光元件的驱动控制电路写入数据信号；驱动控制电路，在行扫描信号有效期间，在写入数据信号的同时，写入发光元件的驱动元件的参数；其中，驱动控制电路还接收电平控制信号，并在发光元件的发光阶段，根据数据信号、驱动元件的参数和电平控制信号，向所述驱动元件提供驱动电压；以及驱动元件，将驱动控制电路提供的驱动电压转变成驱动电流，并提供给发光元件，使得发光元件在驱动元件提供的驱动电流的驱动下发光。其中，所述电平控制信号被配置为包含高电平和低电平，所述高电平和低电平中的一个电平使得驱动电压不足以驱动所述驱动元件，而所述高电平和低电平中的另一个电平使得驱动控制电路根据数据信号和驱动元件的参数来向驱动元件提供驱动电压，使所述发光元件发光。
优选地，所述电平控制信号是发光元件的电源信号，其中驱动控制电路在电平控制信号为高电平时根据数据信号和驱动元件的参数向驱动元件提供驱动电压，通过驱动元件驱动发光元件，使发光元件发光；在电平控制信号为低电平时提供的驱动电压无法驱动所述驱动元件，从而发光元件不发光。
优选地，由电压选择器产生高电平的电源信号和低电平的电源信号；其中，所述电压选择器包含输出高电平的电源信号的高电平电压电源和输出低电平的电源信号的低电平电压电源；所述电压选择器接收选择信号，根据选择信号来选择输出高电平和低电平之一的电源信号。
优选地，将使得发光元件正常发光的电源信号设置为所述高电平的电源信号和低电平的电源信号中的一个；所述高电平的电源信号和低电平的电源信号中的另一个被设置为当施加该电源信号时，在所有数据信号下，驱动元件都处于截止状态。
优选地，所述选择信号由所述源驱动电路或外部电路产生。
优选地，所述电压选择器被包括在所述源驱动电路中。
优选地，所述电平控制信号被输入到所述驱动元件的控制端，其中，高电平和低电平中的一个电平的电平控制信号使得驱动元件正常驱动；高电平和低电平中的另一个电平的电平控制信号使得驱动元件处于截止状态或处于微导通状态。
优选地，所述电平控制信号由有源驱动电路或外部电路产生。
优选地，所述电平控制信号与行扫描信号同步。
优选地，所述电平控制信号的高低电平的占空比可调。
优选地，所述电压选择器包括：第一晶体管，栅极接收所述驱动电压控制电路的选择信号，源极接收所述高电平的电源信号，漏极连接第二晶体管的栅极；第二晶体管，源极接收所述高电平的电源信号，漏极连接输出端；第一电阻，一端与所述第二晶体管的栅极相连，另一端接地；第三晶体管，栅极连接第四晶体管的源极，源极接收所述低电平的电源信号，漏极连接输出端；第四晶体管，栅极接收所述驱动电压控制电路的选择信号，漏极接地；第二电阻，一端连接到所述第三晶体管的源极，另一端连接到所述第三晶体管的栅极。
根据本公开的第二方面，提供一种发光元件的驱动方法，用于根据本公开的驱动装置，包括：在行扫描线上提供行扫描信号；在数据线上提供数据信号；提供电平控制信号；在行扫描信号有效期间，在写入数据信号的同时，将发光元件的驱动元件的参数写入驱动控制电路；在发光元件的发光阶段，根据数据信号、驱动元件的参数和电平控制信号，向所述驱动元件提供驱动电压。其中，所述电平控制信号被配置为包含高电平和低电平，所述高电平和低电平中的一个电平使得驱动电压不足以驱动所述驱动元件，而所述高电平和低电平中的另一个电平使得根据数据信号和驱动元件的参数来向驱动元件提供驱动电压，使所述发光元件发光。
优选地，所述电平控制信号是所述发光元件的电源信号。
优选地，所述电平控制信号施加于所述驱动元件的控制端，其中，高电平和低电平中的一个电平的电平控制信号使得驱动元件正常驱动；高电平和低电平中的另一个电平的电平控制信号使得驱动元件处于截止状态或处于微导通状态。
优选地，所述电平控制信号与行扫描信号同步。
根据本公开的第三方面，提供一种显示装置，包括根据本公开的驱动装置； 以及发光元件，根据驱动装置提供的驱动电流来发光。
附图说明
通过下面结合附图说明本发明的优选实施例，将使本发明的上述及其它目的、特征和优点更加清楚，其中：
图1是现有技术中像素驱动电路的结构示意图；
图2是现有技术中的像素驱动电路的操作时序图；
图3是示出了OLED的驱动电流与亮度之间的关系的图；
图4是传统的显示装置的结构示意图；
图5是传统的显示装置中的驱动装置的操作时序图；
图6是根据本发明实施例的驱动装置的结构示意图；
图7是根据本发明实施例的显示装置的结构示意图；
图8是根据本发明实施例的显示装置中的驱动装置的操作时序图；
图9示出了根据本发明实施例的电压选择器的示意图；
图10示出了根据本发明又一实施例的显示装置的结构示意图。
图11示出了8.4英寸的平板的显示装置的结构示意图；
图12示出了图11所示的显示装置中的驱动装置的操作时序图；
图13是根据本发明实施例的显示装置的结构示意图；
图14是根据本发明实施例的显示装置中的驱动装置的操作时序图；
图15示出了根据本发明又一实施例的显示装置的结构示意图。
图16示出了图15所示的显示装置中的驱动装置的操作时序图。
图17示出了根据本发明实施例的驱动装置的驱动方法的流程图。
具体实施方式
以下参照附图，对本发明的示例实施例进行详细描述。在以下描述中，一些具体实施例仅用于描述目的，而不应该理解为对本发明有任何限制，而只是本发明的示例。在可能导致对本发明的理解造成混淆时，将省略常规结构或构造。
图4是传统的显示装置的结构示意图。如图4所示，显示装置包括源驱动电路400、驱动控制电路、驱动元件和布置成b行*a列的发光元件。源驱动电路400提供行扫描信号G1-Gb并提供数据信号S1-Sa。需要注意的是，虽然图4中仅示 出源驱动电路提供数据信号S1-Sa，但是源驱动电路也提供扫描信号G1-Gb。这对于下面示出的图示也是适用的。对于8比特的显示器，可以提供28＝256个灰阶电压。对于10比特的显示器，需要提供210＝1024个灰阶电压。ELVDD表示电源信号的电压。
图5是传统的显示装置中的驱动装置的操作时序图。在此，以PMOS晶体管为例进行说明。即，低电平为有效电平。当第m行扫描信号Gm为低时，m行整个一行的发光元件被选择，这时a个数据信号S1-Sa分别写入到m行的a个发光元件的驱动控制电路中。第m行扫描信号结束时，第m+1行打开，同样a个数据信号S1-Sa分别写入到第m+1行的a个发光元件的驱动控制电路中，以此类推。第m行的数据信号写入到相应的驱动控制电路中之后，驱动控制电路向驱动元件提供与数据信号相对应的驱动电压，由驱动元件将驱动电压转变成驱动电流来驱动发光元件。一般情况下ELVDD是一个恒定电压。
图6是根据本发明实施例的驱动装置600的结构示意图。
如图6所示，根据本发明实施例，驱动装置600包括：源驱动电路610，用于根据输入的视频信号来产生行扫描信号和数据信号；驱动控制电路620，用于在行扫描信号有效期间，在写入数据信号的同时，写入发光元件的驱动元件的参数；其中，驱动控制电路还接收电平控制信号，并在发光元件的发光阶段，根据源驱动电路的行扫描信号、数据信号以及电平控制信号，产生驱动电压；以及驱动元件630，用于将驱动控制电路提供的驱动电压转变成驱动电流。图6还示出了发光元件640，根据驱动装置600提供的驱动电流，具体地，根据驱动元件630提供的驱动电流来发光。所述电平控制信号被配置为包含高电平和低电平，所述高电平和低电平中的一个电平使得驱动电压不足以驱动所述驱动元件，而所述高电平和低电平中的另一个电平使得驱动控制电路根据数据信号和驱动元件的参数来向驱动元件提供驱动电压，该驱动电压能够对驱动元件的参数进行补偿并使得发光元件正常发光。
图7是根据本发明实施例的显示装置的结构示意图。图7所示的显示装置利用图6所述的根据本发明实施例的驱动装置600。图8是根据本发明实施例的显示装置中的驱动装置的操作时序图。
如图7所示，给显示装置提供高电平的电压ELVH和低电平的电压ELVL，并且给显示装置提供电压选择器。即，所述电平控制信号是发光元件的电源信号。
如图7所述，电压选择器接收两电平的信号，即高电平的电源信号和低电平的电源信号。源驱动电路600向电压选择器输出选择信号ELC，以使得电压选择器选择性地输出高电平的电源信号和低电平的电源信号之一。驱动控制电路在电平控制信号为高电平的电源信号时根据数据信号和驱动元件的参数向驱动元件提供驱动电压，通过驱动元件驱动发光元件，使发光元件发光；在电平控制信号为低电平的电源信号时提供的驱动电压无法驱动所述驱动元件，从而发光元件不发光。
如图8所示，源驱动电路输出的选择信号ELC为占空比为D的脉冲控制信号，该脉冲的周期和显示装置的行扫描信号的周期一致，且在一个行扫描信号的周期内分为高电平和低电平，从而使得电压选择器输出的电源信号的电压ELVDD也相应地分为高电平和低电平，分别表示为发光元件的发光子阶段和不发光子阶段。
在提供的电源信号的电压ELVDD为交替的高电平和低电平时，在电源信号的电压为低电平时不能够写入数据信号，因为这时写入的信号不再是对应于数据信号的数据电压。因此，相应地，调整行扫描信号Gm，使其选通时间与高电平的电源信号的持续时间相同。即电平控制信号与行扫描信号同步。相应地，可以调整ELC的高低电平的占空比，以实现所需的驱动电流密度，但是，ELC的最小占空比需要确保数据写入时间。
根据本发明的实施例，所述电压选择器设置在源驱动电路外部。根据另一个实施例，电压选择器可被包括在源驱动电路内。电压选择器包含输出高电平的电源信号的高电平电压电源和输出低电平的电源信号的低电平电压电源。根据一个实施例，所述选择信号ELC由所述源驱动电路或外部电路产生。
图9示出了根据本发明实施例的电压选择器的示意图。如图9所示，电压选择器900包括：第一晶体管T1，栅极接收所述驱动电压控制电路的选择信号，源极接收所述高电平的电源信号，漏极连接第二晶体管T2的栅极；第二晶体管T2，源极接收所述高电平的电源信号，漏极连接输出端；第一电阻R1，一端与所述第二晶体管T2的栅极相连，一端接地；第三晶体管T3，栅极连接第四晶体管T4的源极，源极接收所述低电平的电源信号，漏极连接输出端；第四晶体管T4，栅极接收所述驱动电压控制电路的选择信号，漏极接地；第二电阻R2，一端连接到所述第三晶体管T3的源极，一端连接到所述第三晶体管T3的栅极。
在选择信号ELC选择高电平信号ELVDDH时，晶体管T1、T4导通，T3截止， T2导通，因此，输出的电源信号的电压ELVDD等于ELVDDH-T1的导通电压，因此输出电压近似等于ELVDDH的电源信号。在选择信号ELC选择低电平信号ELVDDL时，T1、T4截止，T2截止，T3导通，输出的电源信号的电压ELVDD等于ELVDDL-T3的导通电压，因此输出电压近似等于ELVDDL的电源信号。因此，通过控制选择信号ELC，可以选择性地输出高电平和低电平的电源信号。
显然在图9所示的电压选择器中，以PMOS晶体管为例进行了说明。但是，需要注意的是，也可以使用NMOS晶体管或其他晶体管，甚至其他连接方式，只要输入高电平信号ELVDDH和低电平信号ELVDDL，输出的电源信号根据选择信号而选择性地输出高电平和低电平的电源信号。
根据本发明的实施例，电压选择器也可以集成到源驱动电路中。图10示出了根据本发明又一实施例的显示装置的结构示意图。在根据本发明实施例的显示装置中，源驱动电路接收高电平的电源信号和低电平的电源信号，在每一行的扫描期间，选择性地向驱动元件输出高电平的电源信号和低电平的电源信号之一，高电平的电源信号驱动发光元件发光，而低电平的电源信号无法驱动发光元件发光。
在上述实施例中，通过调整在发光元件的发光阶段提供的驱动电压，可以调整驱动电流的密度，从而提高显示质量。
图11示出了8.4英寸的平板的显示装置的一个结构示意图。图12示出了图11所示的显示装置中的驱动装置的操作时序图。
如图12所示，图11所示的显示装置的操作时序如下：
1)复位阶段t1，驱动控制信号EM和扫描信号Gate为高电平，晶体管T5和晶体管T6断开，晶体管T3和晶体管T4也断开，复位信号Reset信号为低电平，电容C1通过晶体管T7和晶体管T1复位，即电容C1两端的电压分别是ELVDD和Vint。
2)数据写入阶段t2，驱动控制信号EM和复位信号Reset信号为高电平，T5、T6、T1和T7断开，扫描信号Gate信号为低电平，T4和T2导通。由于复位阶段向电容C1的N2点写入Vint负电位，T3导通，所以T3通过T2向N2写入ELVDD-Vth电平，而数据data通过T4向C1的N1点写入数据信号data。C1两端的电压就是ELVDD-Vth-Vdata。
3)发光阶段t3，复位信号Reset和扫描信号Gate都是高电平，T1、T7、T2和T4关断，驱动控制信号EM信号为低电平，则T5和T6导通，T3也导通，ELVDD’ 电平通过T5钳位到C1的N1端，N2点电平就变成ELVDD’+ELVDD-Vth-Vdata。
在发光阶段t3，T3的驱动电流为
Figure PCTCN2016088370-appb-000004
ELVDD’的功能是降低电阻压降的影响，其用作参考电平。
可以看出，驱动电流与电源信号的电压ELVDD没有关系。一般情况下ELVDD’是单电平信号。
图13是根据本发明实施例的显示装置的结构示意图。如图13所示，根据本发明实施例的显示装置的驱动装置还包括参考电压控制电路，被配置为产生高电平的参考电压和低电平的参考电压。
具体地，根据本发明实施例的驱动装置的参考电压控制电路被配置为产生高电平的参考电压和低电平的参考电压。所述驱动控制电路被配置为根据参考电压，向驱动元件的控制端提供高/低电平的信号。高电平和低电平中的一个电平的信号使得驱动元件正常驱动；高电平和低电平中的另一个电平的信号使得驱动元件处于截止状态或处于微导通状态。
由参考电压控制电路产生高电平的参考电压和低电平的参考电压。一般电压幅度可通过编程进行调整。
图14是根据本发明实施例的显示装置中的驱动装置的操作时序图。
结合图11、图13和图14，图13所示的显示装置中的驱动装置的操作时序如下：
1)复位阶段t1，驱动控制信号EM和扫描信号Gate为高电平，晶体管T5和晶体管T6断开，晶体管T3和晶体管T4也断开，复位信号Reset信号为低电平，电容C1通过晶体管T7和晶体管T1复位，即电容C1两端的电压分别是ELVDD和Vint。
2)数据写入阶段t2，驱动控制信号EM和复位信号Reset信号为高电平，T5、T6、T1和T7断开，扫描信号Gate信号为低电平，T4和T2导通。由于复位阶段向电容C1的N2点写入Vint负电位，T3导通，所以T3通过T2向N2写入ELVDD-Vth电平，而数据data通过T4向C1的N1点写入数据信号data。C1两端的电压就是ELVDD-Vth-Vdata。
3)发光阶段t3，包括交替的发光子阶段t4和不发光子阶段t5。复位信号Reset和扫描信号Gate都是高电平，T1、T7、T2和T4关断，驱动控制信号EM信号为低电平，则T5和T6导通，T3也导通，Vref的电平通过T5钳位到C1的N1端，N2点电平就变成Vref+ELVDD-Vth-Vdata。在t4阶段，Vref为低电平的参考电压VrefL，即，可以控制T3正常导通而使得发光元件发光的电平。在t5阶段，Vref变为高电平的参考电压VrefH，由于Vref电平升高，C的N2端的电平也升高，使得T3截止，发光元件不发光。
在该实施例中，可以通过调整VrefL和VrefH的占空比，调整发光元件的发光亮度，即发光元件的电流密度。
图15示出了根据本发明又一实施例的显示装置的结构示意图。
根据本发明的实施例，由外部电路产生高电平的参考电压和低电平的参考电压。根据本发明的实施例，驱动装置包括源驱动电路、驱动控制电路、驱动元件和发光元件。源驱动电路向接收高电平的参考电压和低电平的参考电压的参考电压控制电路输出选择信号，以使得参考电压控制电路选择性地输出高电平的参考电压和低电平的参考电压之一，以便由所述驱动控制电路提供高电平的驱动电压和低电平的驱动电压。
图16示出了图15所示的显示装置中的驱动装置的操作时序图。参考电压选择电路根据源驱动电路输出的选择信号Eon，选择性地输出VrefH或VrefL。
虽然在图6中示出了驱动装置，在图7、图10、图13和图15示出了显示装置，在图9示出了电压选择器，但是本领域技术人员可以明了，这些电路、装置可以采用其他结构。例如，根据本发明实施例的驱动装置可以应用于具有其他结构的显示装置，根据本发明实施例的电压选择器可以应用于具有其他结构的驱动装置。这些图仅作为示例示出。例如，图9示出了电压选择器的结构可以不局限于所示出的结构。
图17示出了根据本发明实施例的驱动装置的驱动方法的流程图。
如图17所示，根据本发明实施例的驱动装置的驱动方法包括：步骤S1710，在行扫描线上提供行扫描信号；步骤S1720，在数据线上提供数据信号；步骤S1730，提供电平控制信号；步骤S1740，在行扫描信号有效期间，在写入数据信号的同时，将发光元件的驱动元件的参数写入驱动控制电路；步骤S1750，在发光元件的发光阶段，根据数据信号、驱动元件的参数和电平控制信号，向所述驱动元件 提供驱动电压。其中，所述电平控制信号被配置为包含高电平和低电平，所述高电平和低电平中的一个电平使得驱动电压不足以驱动所述驱动元件，而所述高电平和低电平中的另一个电平使得根据数据信号和驱动元件的参数来向驱动元件提供驱动电压，使所述发光元件发光。
步骤S1710～S1730可以并行地执行。换言之，预先将行扫描线与行扫描信号源相连，将数据线与数据源相连，将电平控制信号的源与电平控制信号的线相连。然后，执行步骤S1710～S1730，使得显示装置进入数据写入阶段，即行扫描信号有效，同时写入数据信号。此时，在步骤S1740中，将发光元件的驱动元件的参数写入驱动控制电路。然后，在显示装置进入发光元件的发光阶段时，在步骤S1750中，根据写入的数据信号、驱动元件的参数和电平控制信号，向所述驱动元件提供驱动电压。
根据本发明的实施例，电平控制信号可以是发光元件的电源信号。即，驱动控制电路在电平控制信号为高电平时根据数据信号和驱动元件的参数向驱动元件提供驱动电压，通过驱动元件驱动发光元件，使发光元件发光；在电平控制信号为低电平时提供的驱动电压无法驱动所述驱动元件，从而发光元件不发光。
根据本发明的实施例，电平控制信号可以施加于驱动元件的控制端。其中，高电平和低电平中的一个电平的电平控制信号使得驱动元件正常驱动；高电平和低电平中的另一个电平的电平控制信号使得驱动元件处于截止状态或处于微导通状态。
根据本发明的实施例，电平控制信号与行扫描信号同步。即，行扫描信号的选通时间与高电平的电源信号的持续时间相同，以使得在电源信号为低电压时不写入数据信号。
应当注意的是，在以上的描述中，仅以示例的方式，示出了本公开的技术方案，但并不意味着本公开局限于上述步骤和结构。在可能的情形下，可以根据需要对步骤和结构进行调整和取舍。因此，某些步骤和单元并非实施本公开的总体发明思想所必需的元素。因此，本公开所必需的技术特征仅受限于能够实现本公开的总体发明思想的最低要求，而不受以上具体实例的限制。
至此已经结合优选实施例对本公开进行了描述。应该理解，本领域技术人员在不脱离本公开的精神和范围的情况下，可以进行各种其它的改变、替换和添加。因此，本公开的范围不局限于上述特定实施例，而应由所附权利要求所限定。

Claims (16)

  1. 一种驱动装置，用于驱动发光元件，包括：
    源驱动电路，产生驱动发光元件所需的行扫描信号、数据信号，其中，在行扫描信号有效期间，向发光元件的驱动控制电路写入数据信号；
    驱动控制电路，在行扫描信号有效期间，在写入数据信号的同时，写入发光元件的驱动元件的参数；其中，驱动控制电路还接收电平控制信号，并在发光元件的发光阶段，根据数据信号、驱动元件的参数和电平控制信号，向所述驱动元件提供驱动电压；以及
    驱动元件，将驱动控制电路提供的驱动电压转变成驱动电流，并提供给发光元件，使得发光元件在驱动元件提供的驱动电流的驱动下发光；
    其中，所述电平控制信号被配置为包含高电平和低电平，所述高电平和低电平中的一个电平使得驱动电压不足以驱动所述驱动元件，而所述高电平和低电平中的另一个电平使得驱动控制电路根据数据信号和驱动元件的参数来向驱动元件提供驱动电压，使所述发光元件发光。
  2. 根据权利要求1所述的驱动装置，其中，所述电平控制信号是发光元件的电源信号，其中驱动控制电路在电平控制信号为高电平时根据数据信号和驱动元件的参数向驱动元件提供驱动电压，通过驱动元件驱动发光元件，使发光元件发光；在电平控制信号为低电平时提供的驱动电压无法驱动所述驱动元件，从而发光元件不发光。
  3. 根据权利要求2所述的驱动装置，其中，由电压选择器产生高电平的电源信号和低电平的电源信号；其中，所述电压选择器包含输出高电平的电源信号的高电平电压电源和输出低电平的电源信号的低电平电压电源；所述电压选择器接收选择信号，根据选择信号来选择输出高电平和低电平之一的电源信号。
  4. 根据权利要求3所述的驱动装置，其中，将使得发光元件正常发光的电源信号设置为所述高电平的电源信号和低电平的电源信号中的一个；所述高电平的电源信号和低电平的电源信号中的另一个被设置为当施加该电源信号时，在所有数据信号下，驱动元件都处于截止状态。
  5. 根据权利要求3所述的驱动装置，其中，所述选择信号由所述源驱动电路或外部电路产生。
  6. 根据权利要求3所述的驱动装置，其中，所述电压选择器被包括在所述源驱动电路 中。
  7. 根据权利要求1所述的驱动装置，其中，所述电平控制信号被输入到所述驱动元件的控制端，其中，高电平和低电平中的一个电平的电平控制信号使得驱动元件正常驱动；高电平和低电平中的另一个电平的电平控制信号使得驱动元件处于截止状态或处于微导通状态。
  8. 根据权利要求7所述的驱动装置，其中，所述电平控制信号由有源驱动电路或外部电路产生。
  9. 根据权利要求1-8之一所述的驱动装置，其中，所述电平控制信号与行扫描信号同步。
  10. 根据权利要求1-8之一所述的驱动装置，其中，所述电平控制信号的高低电平的占空比可调。
  11. 根据权利要求3所述的驱动装置，其中，所述电压选择器包括：第一晶体管，栅极接收所述驱动电压控制电路的选择信号，源极接收所述高电平的电源信号，漏极连接第二晶体管的栅极；第二晶体管，源极接收所述高电平的电源信号，漏极连接输出端；第一电阻，一端与所述第二晶体管的栅极相连，另一端接地；第三晶体管，栅极连接第四晶体管的源极，源极接收所述低电平的电源信号，漏极连接输出端；第四晶体管，栅极接收所述驱动电压控制电路的选择信号，漏极接地；第二电阻，一端连接到所述第三晶体管的源极，另一端连接到所述第三晶体管的栅极。
  12. 一种发光元件的驱动方法，用于根据权利要求1-11之一所述的驱动装置，包括：
    在行扫描线上提供行扫描信号；
    在数据线上提供数据信号；
    提供电平控制信号；
    在行扫描信号有效期间，在写入数据信号的同时，将发光元件的驱动元件的参数写入驱动控制电路；
    在发光元件的发光阶段，根据数据信号、驱动元件的参数和电平控制信号，向所述驱动元件提供驱动电压，
    其中，所述电平控制信号被配置为包含高电平和低电平，所述高电平和低电平中的一个电平使得驱动电压不足以驱动所述驱动元件，而所述高电平和低电平中的另一个电平使得根据数据信号和驱动元件的参数来向驱动元件提供驱动电压，使所述发光元件发光。
  13. 根据权利要求12所述的驱动方法，其中，
    所述电平控制信号是所述发光元件的电源信号。
  14. 根据权利要求12所述的驱动方法，其中，
    所述电平控制信号施加于所述驱动元件的控制端，
    其中，高电平和低电平中的一个电平的电平控制信号使得驱动元件正常驱动；高电平和低电平中的另一个电平的电平控制信号使得驱动元件处于截止状态或处于微导通状态。
  15. 根据权利要求12-14之一所述的驱动方法，其中，
    所述电平控制信号与行扫描信号同步。
  16. 一种显示装置，其特征在于，包括：
    如权利要求1至11中的任一项所述的驱动装置；以及
    发光元件，根据驱动装置提供的驱动电流来发光。
PCT/CN2016/088370 2015-12-31 2016-07-04 一种驱动装置、驱动方法和显示装置 Ceased WO2017113678A1 (zh)

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