WO2017045235A1 - 一种显示装置的驱动系统及适用于oled的驱动电路 - Google Patents

一种显示装置的驱动系统及适用于oled的驱动电路 Download PDF

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Publication number
WO2017045235A1
WO2017045235A1 PCT/CN2015/091673 CN2015091673W WO2017045235A1 WO 2017045235 A1 WO2017045235 A1 WO 2017045235A1 CN 2015091673 W CN2015091673 W CN 2015091673W WO 2017045235 A1 WO2017045235 A1 WO 2017045235A1
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Prior art keywords
transistor
signal
oled
driving
level
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English (en)
French (fr)
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王振岭
黄泰钧
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Priority to US14/897,696 priority Critical patent/US10319292B2/en
Publication of WO2017045235A1 publication Critical patent/WO2017045235A1/zh
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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
    • 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
    • G09G3/3233—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 with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0243—Details of the generation of driving signals
    • G09G2310/0251—Precharge or discharge of pixel before applying new pixel voltage
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/0204—Compensation of DC component across the pixels in flat panels
    • 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
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • 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
    • G09G2320/0238—Improving the black level
    • 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
    • G09G2320/04—Maintaining the quality of display appearance
    • G09G2320/043—Preventing or counteracting the effects of ageing
    • G09G2320/045—Compensation of drifts in the characteristics of light emitting or modulating elements
    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular to a driving system for a display device and a driving circuit suitable for an OLED.
  • the electric field of the DC driving voltage applied for a long time causes the internal ions of the OLED to be polarized to form a built-in electric field, thereby The OLED threshold voltage is increased, which greatly reduces the luminous efficiency of the OLED and shortens the lifetime of the OLED.
  • the existing 2T1C pixel unit driving circuit includes an input transistor T 1 , a storage capacitor C S and a driving transistor T 2 , and T 1 and T 2 used in FIG. 1 are n-type transistors, and V SCAN is a scanning voltage.
  • V DATA is the data voltage
  • T 2 is used to drive the OLED
  • V DD is high
  • V SS is low.
  • V SCAN When the 2T1C pixel unit driving circuit shown in FIG. 1 is in operation, when V SCAN is at a high level, the data voltage V DATA is output to T 2 through T 1 , and T 2 is turned on, and the potential of the anode of the OLED is (V).
  • V DATA - V th -V OLED where V th is the threshold voltage of T 2 , V OLED is the voltage difference between the anode and cathode of the OLED; and when V SCAN is low, the voltage stored in C S is still It can make T 2 in a conducting state.
  • the 2T1C pixel unit driving circuit shown in FIG. 1 is always illuminated after being added to the data voltage V DATA through the data line.
  • the OLED is in a DC-biased state for a long time, and the polarization of the organic material is accelerated, which causes the built-in electric field of the OLED to be enhanced, and the threshold voltage of the OLED is increased, which greatly reduces the luminous efficiency of the OLED and shortens the lifetime of the OLED.
  • An object of the present invention is to provide a driving system for a display device and a driving circuit suitable for the OLED, which can be modified.
  • Good OLEDs are in a DC-biased state for a long time, resulting in a shortened lifetime of OLEDs.
  • a first aspect of the present invention provides a driving circuit suitable for an OLED, comprising: a driving unit for driving an OLED connected to a scan line and a data line, and a reverse bias unit connected to the OLED, the The biasing unit is configured to control the OLED to be reverse biased when a black picture is inserted between two frames of images.
  • the driving unit includes a first transistor, a second transistor, and a storage capacitor, and an output end of the first transistor is connected to the first end of the storage capacitor and the control end of the second transistor, the storing The second end of the capacitor is coupled to the first drive signal, the output of the second transistor is coupled to the anode of the OLED, and the cathode of the OLED is coupled to the cathode drive signal.
  • the cathode driving signal is switched between a first level and a second level, the first level being equal to a high level of the first driving signal, the first level being higher than Said second level.
  • the reverse bias unit includes a third transistor and a fourth transistor, wherein a control end of the third transistor is connected to a first control signal, and an input end of the third transistor is connected to the storage capacitor
  • the second end of the third transistor is connected to the input end of the second transistor
  • the control end of the fourth transistor is connected to the second control signal
  • the input end of the fourth transistor is connected to the OLED
  • the anode of the fourth transistor is connected to the second driving signal, the amplitude of the second driving signal is smaller than the amplitude of the first driving signal, and the amplitude of the second driving signal is greater than The amplitude of the signal accessed by the control terminal of the two transistors;
  • the second transistor and the OLED are reverse biased when the third transistor is turned off, the fourth transistor is turned on, and the cathode driving signal is at a second level.
  • the reverse bias unit controls the OLED to perform reverse bias when inserting a black image between two frames of images, thereby not only eliminating residual charges in the OLED, but also eliminating the residual charge in the OLED. To extend the life of the OLED, it can also ensure that the display of the display device is not affected when the OLED is reverse biased.
  • a second aspect of the present invention provides a driving system for a display device, including the above driving circuit, further comprising:
  • the processing unit buffers the data signal from the signal source, performs a double frame processing on the data signal by inserting a black picture between the adjacent two frames of data signals, and outputs the data signal after the double frame processing to the display panel;
  • control unit when the processing unit outputs a data signal corresponding to a black screen, outputting a reverse bias signal
  • the reverse bias unit of the driving circuit is configured to control the OLED and the driving transistor to be reverse biased according to the reverse bias signal.
  • the reverse bias signal includes a first control signal and a second control signal, and the first control signal is sent to a control end of the third transistor in the reverse bias unit, the second A control signal is supplied to the control terminal of the fourth transistor.
  • the first control signal and the second control signal are in the same frequency and opposite in phase.
  • the reverse bias signal further includes a cathode driving signal, and the cathode driving signal is switched between a first level and a second level, the first level being higher than the second level,
  • the cathode driving signal is at a high level.
  • the drive system further includes:
  • An analysis unit that analyzes the average image level frame by frame
  • a gamma voltage unit when the average image level output by the analysis unit is greater than a preset value, outputting a first gamma voltage, and vice versa, outputting a second gamma voltage, wherein the first gamma voltage is less than the first Two gamma voltage.
  • FIG. 1 is a schematic structural view of a driving circuit in the prior art
  • FIG. 2 is a schematic structural diagram of a driving circuit in an embodiment of the present invention.
  • FIG. 3 is a detailed schematic diagram of a driving circuit in an embodiment of the present invention.
  • Figure 4 is an equivalent schematic view of Figure 3;
  • FIG. 5 is a schematic structural diagram of a driving system in an embodiment of the present invention.
  • Figure 6 is a schematic diagram of signals in an embodiment of the present invention.
  • An embodiment of the present invention provides a driving circuit suitable for an OLED.
  • the driving unit for driving an OLED connected to a scan line and a data line further includes a reverse bias unit connected to the OLED.
  • the OLED is always in a DC biased light state, that is, the anode of the OLED has a high potential.
  • the potential of the cathode tends to increase the built-in electric field of the OLED, and the threshold voltage of the OLED increases, which greatly reduces the luminous efficiency of the OLED and shortens the lifetime of the OLED.
  • the reverse bias unit controls the OLED to perform reverse bias when a black frame is inserted between two frames of images, thereby ensuring that the display effect of the display device is not affected when the OLED is reverse biased.
  • the driving unit includes a first transistor T 1 , a second transistor T 2 , and a storage capacitor C S .
  • the output end of the first transistor T 1 is connected to the first end of the storage capacitor C S and the control end of the second transistor T 2 , and the second end of the storage capacitor C S is connected to the first driving signal V 1 , and the second transistor T 2
  • the output is connected to the anode of the OLED, and the cathode of the OLED is connected to the cathode drive signal V 2 .
  • the reverse bias unit includes a third transistor T 3 and a fourth transistor T 4 .
  • the control terminal of the third transistor T 3 is connected to the first control signal Ctrl1, the input end of the third transistor T 3 is connected to the second end of the storage capacitor C S , and the output terminal of the third transistor T 3 is connected to the second transistor T 2 .
  • the input end of the fourth transistor T 4 is connected to the second control signal Ctrl2, the input end of the fourth transistor T 4 is connected to the anode of the OLED, and the output end of the fourth transistor T 4 is connected to the second driving signal V 2 .
  • the amplitude of the second driving signal V 2 is smaller than the amplitude of the first driving signal V 1 , while the amplitude of the second driving signal is greater than the amplitude of the signal accessed by the control terminal of the second transistor T 2 .
  • the high level of the first driving signal V 1 in FIG. 3 is equal to the high level V DD in the prior art.
  • the cathode drive signal V 2 is switched between a first level and a second level, the first level being higher than the second level.
  • the first level of volts is equal to the prior art high level V DD
  • the second level of volts is equal to the prior art low level V SS .
  • the first control signal Ctrl1 is used to drive the third transistor T 3
  • the second control signal Ctrl2 is used to drive the fourth transistor T 4
  • the third transistor T 3 is arranged to be able to disconnect the input terminal of the second transistor T 2 from the first driving signal V 1
  • the fourth transistor T 4 is arranged to turn off the second transistor in the third transistor T 3 .
  • the connection of the fourth transistor T 4 and the OLED must be disconnected, otherwise the OLED will not be able to normally emit light, which affects the display device. display effect.
  • the third transistor T 3 and the fourth transistor T 4 are in a state in which one of them is turned off and the other is turned on, the first control signal Ctrl1 and the second control signal of the third transistor T 3 and the fourth transistor T 4 are respectively driven.
  • Ctrl2 should be the same frequency and opposite phase, as shown in Figure 6.
  • the OLED does not emit light at this time, and is in a reverse bias state together with the second transistor T 2 , which can eliminate the residual charge in the second transistor T 2 and the OLED, and suppress the threshold voltage in the second transistor T 2 . Offset, while extending the life of the OLED.
  • the embodiment provides a driving system for a display device, as shown in FIG. 5, including the driving circuit shown in FIG. 2, and further includes:
  • the processing unit buffers the data signal from the signal source, performs a double frame processing on the data signal by inserting a black picture between the adjacent two frame data signals, and outputs the data signal after the double frame processing to the display panel.
  • the principle of the frequency multiplication technology is to insert a black frame between the traditional two frames of images to increase the 60Hz refresh rate of the ordinary display device to 120Hz.
  • the display signal of the display device is raised from the original 60 frames per second to the current 120 frames per second, which effectively solves the problems of image sticking and smearing which occur when the display device plays the moving picture, and is beneficial for clearing the image of the previous frame.
  • the effect of residual image and improved dynamic definition reduces the image tail to a level that is difficult for the human eye to perceive.
  • the processing unit includes a singular frame storage module and a double frame storage module.
  • the signal source When the display device starts to work, the signal source outputs a first frame picture signal, and the processing unit receives the first frame picture signal and stores it in the singular frame storage module.
  • the processing unit receives the second frame picture signal and stores it in the double frame storage module.
  • the singular frame storage module and the double frame storage module alternately output picture signals.
  • the processing unit further includes a black screen generating module for generating a black screen signal.
  • the drive system further includes a control unit that outputs a control signal to control whether the processor outputs a picture signal or a black picture, and outputs a reverse bias signal when the control processing unit outputs a data signal corresponding to the black picture.
  • a reverse biasing unit in the driving circuit is used to control the reverse biasing of the OLED and the driving transistor according to the reverse bias signal.
  • the reverse bias signal includes a first control signal and a second control signal, the first control signal is supplied to the control terminal of the third transistor in the reverse bias unit, and the second control The signal is supplied to the control terminal of the fourth transistor.
  • the reverse bias signal also includes a cathode drive signal, the cathode drive signal is at a first level and The two levels are switched, the first level is higher than the second level, and when the processing unit outputs the data signal corresponding to the black picture, the cathode driving signal is at a high level.
  • the processing unit when the control unit output control signal Frame_ctrl is at a high level, the processing unit outputs a picture signal, the first control signal Ctrl1 is at a high level, and the second control signal Ctrl2 is at a low level, the first driving The signal V 1 is at a high level, the cathode drive signal V 2 is equal to V SS , V 3 is at a high level, and the second drive signal V 4 is at a constant value.
  • Each device is displayed as G 1 in the gate lines G n to progressive scan start, the processing unit outputs a display screen on the display device.
  • the black picture signal processing unit When the control unit outputs a control signal Frame_ctrl is low, the black picture signal processing unit outputs the first control signal is low Ctrl1, Ctrl2 the second control signal is high, a first driving signal at a low level V 1
  • the cathode driving signal V 2 is equal to V DD , V 3 is a low level, and the second driving signal V 4 is a constant value.
  • Each device is displayed as G 1 in the gate lines G n to progressive scan start, the processing unit outputs a black screen is displayed on the display device, and drives the second transistor T 2 and the OLED circuit enters a reverse bias state.
  • the double frame processing is implemented by inserting a black frame, which may reduce the brightness of the picture.
  • the driving module provided in this embodiment further includes an analyzing unit and a gamma voltage unit.
  • the analyzing unit is configured to analyze an average picture level (APL) on a frame-by-frame basis; the gamma voltage unit outputs the first gamma when the average image level output by the analyzing unit is greater than a preset value (for example, 0.3)
  • the horse voltage in contrast, outputs a second gamma voltage, wherein the first gamma voltage is less than the second gamma voltage.

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  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

一种显示装置的驱动系统及适用于OLED的驱动电路，属于显示技术领域，可改善OLED长期处于直流偏置发光状态，导致OLED的寿命缩短的现象。

Description

一种显示装置的驱动系统及适用于OLED的驱动电路
本申请要求享有2015年9月15日提交的名称为“一种显示装置的驱动系统及适用于OLED的驱动电路”的中国专利申请CN201510583321.3的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，具体地说，涉及一种显示装置的驱动系统及适用于OLED的驱动电路。
背景技术
在现有技术中，由于有机发光二极管(Organic Light-Emitting Diode，简称OLED)显示器在显示过程中，长时间加载的直流驱动电压的电场造成OLED内部离子极性化，形成内建电场，从而使OLED阈值电压增大，大大降低了OLED的发光效率，缩短了OLED寿命。
如图1所示，现有的2T1C像素单元驱动电路包括输入晶体管T1、存储电容CS和驱动晶体管T2，图1采用的T1和T2为n型晶体管，VSCAN为扫描电压，VDATA为数据电压，T2用于驱动OLED，VDD为高电平，VSS为低电平。
如图1所示的2T1C像素单元驱动电路在工作时，当VSCAN为高电平时，数据电压VDATA通过T1输给T2，T2导通，此时OLED的阳极的电位为(VDATA-Vth-VOLED)，其中Vth为T2的阈值电压，VOLED为OLED的阳极和阴极之间的电压差；而当VSCAN为低电平时，存储在CS中的电压仍能使得T2处于导通状态。
由上可知，图1所示的2T1C像素单元驱动电路通过数据线加入数据电压VDATA之后，就在一帧的时间内一直发光显示。OLED长期处于直流偏置发光状态，有机材料的极性化加速，造成OLED的内建电场增强，OLED阈值电压增大，大大降低了OLED的发光效率，缩短了OLED的寿命。
发明内容
本发明的目的在于提供一种显示装置的驱动系统及适用于OLED的驱动电路，可改 善OLED长期处于直流偏置发光状态，导致OLED的寿命缩短的现象。
本发明第一方面提供了一种适用于OLED的驱动电路，包括与扫描线、数据线连接的用于驱动OLED的驱动单元，还包括与所述OLED连接的反向偏置单元，所述反向偏置单元用于在两帧图像之间插入黑画面时，控制所述OLED进行反向偏置。
可选的，所述驱动单元包括第一晶体管、第二晶体管和存储电容，所述第一晶体管的输出端连接所述存储电容的第一端和所述第二晶体管的控制端，所述存储电容的第二端接入第一驱动信号，所述第二晶体管的输出端连接所述OLED的阳极，所述OLED的阴极接入阴极驱动信号。
可选的，所述阴极驱动信号在第一电平和第二电平之间转换，所述第一电平与所述第一驱动信号的高电平相等，所述第一电平高于所述第二电平。
可选的，所述反向偏置单元包括第三晶体管和第四晶体管，其中，所述第三晶体管的控制端接入第一控制信号，所述第三晶体管的输入端连接所述存储电容的第二端，所述第三晶体管的输出端连接所述第二晶体管的输入端，所述第四晶体管的控制端接入第二控制信号，所述第四晶体管的输入端连接所述OLED的阳极，所述第四晶体管的输出端接入第二驱动信号，所述第二驱动信号的幅值小于所述第一驱动信号的幅值，同时所述第二驱动信号的幅值大于第二晶体管的控制端接入的信号的幅值；
所述第三晶体管断开、所述第四晶体管开启，且所述阴极驱动信号为第二电平时，所述第二晶体管和所述OLED反向偏置。
本发明带来了以下有益效果：本发明实施例中，反向偏置单元是在两帧图像之间插入黑画面时，才控制OLED进行反向偏置，不仅可消除OLED内残留的电荷，起到延长OLED的寿命的作用，还可保证OLED反向偏置时不影响显示装置的显示效果。
本发明第二方面提供了一种显示装置的驱动系统，包括上述的驱动电路，还包括：
处理单元，缓存来自信号源的数据信号，通过在相邻两帧数据信号之间插入黑画面对数据信号进行倍帧处理，并向所述显示面板输出倍帧处理后的数据信号；
控制单元，在所述处理单元输出对应黑画面的数据信号时，输出反向偏置信号；
其中，所述驱动电路的反向偏置单元，用于根据所述反向偏置信号控制所述OLED和所述驱动晶体管反向偏置。
可选的，所述反向偏置信号包括第一控制信号和第二控制信号，所述第一控制信号输送给所述反向偏置单元中的第三晶体管的控制端，所述第二控制信号输送给所述第四晶体管的控制端。
可选的，所述第一控制信号和所述第二控制信号同频、相位相反。
可选的，所述反向偏置信号还包括阴极驱动信号，所述阴极驱动信号在第一电平和第二电平之间转换，所述第一电平高于所述第二电平，当所述处理单元输出对应黑画面的数据信号时，所述阴极驱动信号为高电平。
可选的，该驱动系统还包括：
分析单元，逐帧分析平均图像电平；
伽马电压单元，当所述分析单元输出的平均图像电平大于预设值时，输出第一伽马电压，反之，输出第二伽马电压，其中所述第一伽马电压小于所述第二伽马电压。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要的附图做简单的介绍：
图1是现有技术中的驱动电路的结构示意图；
图2是本发明实施例中的驱动电路的结构示意图；
图3是本发明实施例中的驱动电路的具体示意图；
图4是图3的等效示意图；
图5本发明实施例中的驱动系统的结构示意图；
图6是本发明实施例中的信号示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
实施例一
本发明实施例提供了一种适用于OLED的驱动电路，如图2所示，包括与扫描线、数据线连接的用于驱动OLED的驱动单元，还包括与OLED连接的反向偏置单元。
由于在现有技术中，OLED始终处于直流偏置发光状态，即OLED的阳极的电势高 于阴极的电势，易导致OLED的内建电场增强，OLED阈值电压增大，大大降低了OLED的发光效率，缩短了OLED的寿命。
为了消除OLED的内建电场，需要将OLED处于反向偏置状态，但是若OLED处于反向偏置状态，则无法顺利发光，整个显示装置的显示屏将进入黑屏状态。因此，本发明实施例中，反向偏置单元是在两帧图像之间插入黑画面时，才控制OLED进行反向偏置，从而可保证OLED反向偏置时不影响显示装置的显示效果。
具体的，如图3所示，驱动单元包括第一晶体管T1、第二晶体管T2和存储电容CS。第一晶体管T1的输出端连接存储电容CS的第一端和第二晶体管T2的控制端，存储电容CS的第二端接入第一驱动信号V1，第二晶体管T2的输出端连接OLED的阳极，OLED的阴极接入阴极驱动信号V2。
而反向偏置单元包括第三晶体管T3和第四晶体管T4。其中，第三晶体管T3的控制端接入第一控制信号Ctrl1，第三晶体管T3的输入端连接存储电容CS的第二端，第三晶体管T3的输出端连接第二晶体管T2的输入端；第四晶体管T4的控制端接入第二控制信号Ctrl2，第四晶体管T4的输入端连接OLED的阳极，第四晶体管T4的输出端接入第二驱动信号V2。
进一步的，第二驱动信号V2的幅值小于第一驱动信号V1的幅值，同时第二驱动信号的幅值大于第二晶体管T2的控制端接入的信号的幅值。
需要说明的是，图3中的第一驱动信号V1的高电平与现有技术中的高电平VDD相等。而阴极驱动信号V2在第一电平和第二电平之间转换，第一电平高于第二电平。具体的，第一电平的伏值与现有技术中的高电平VDD相等，而第二电平的伏值与现有技术中的低电平VSS相等。
本发明实施例中，第一控制信号Ctrl1用于驱动第三晶体管T3，而第二控制信号Ctrl2用于驱动第四晶体管T4。第三晶体管T3的设置是为了能够断开第二晶体管T2的输入端与第一驱动信号V1的连接，第四晶体管T4的设置是为了在第三晶体管T3断开第二晶体管T2的输入端与第一驱动信号V1的连接时，将OLED处于反向偏置的状态。而当第三晶体管T3将第二晶体管T2的输入端与第一驱动信号V1连接时，必须断开第四晶体管T4与OLED的连接，否则OLED将无法正常发光，影响显示装置的显示效果。
由于第三晶体管T3和第四晶体管T4处于其中一个断开、另一个导通的状态，因此分别驱动第三晶体管T3和第四晶体管T4的第一控制信号Ctrl1和第二控制信号Ctrl2应同频、相位相反，如图6所示。
具体的，当第一控制信号Ctrl1为高电平时，第三晶体管T3导通；同时第二控制信号Ctrl2为低电平信号，第四晶体管T4断开；并且此时的阴极驱动信号V2为低电平，因此显 示装置显示正常画面。此时图3所示的驱动电路的等效电路与图1所示的相同。
而当第一控制信号Ctrl1为低电平时，第三晶体管T3断开；同时第二控制信号Ctrl2为高电平信号，第四晶体管T4导通；并且此时的阴极驱动信号V2为高电平。显然，此时图3的等效电路如图4所示。由于第三晶体管T3断开，并且阴极驱动信号V2的电平高于第二驱动信号V4，同时第二驱动信号V4的伏值高于第二晶体管T2的控制端的电压V3，因此此时OLED不发光，与第二晶体管T2一同均处于反向偏置状态，可消除第二晶体管T2和OLED内残留的电荷，起到抑制第二晶体管T2内的阈值电压的偏移、同时延长OLED的寿命的作用。
实施例二
本实施例提供了一种显示装置的驱动系统，如图5所示，包括如图2所示的驱动电路，另外还包括：
处理单元，缓存来自信号源的数据信号，通过在相邻两帧数据信号之间插入黑画面对数据信号进行倍帧处理，并向显示面板输出倍帧处理后的数据信号。
倍频技术的原理就是在传统的两帧图像之间加插一帧黑色画面，将普通显示装置的60Hz刷新率提升至120Hz。将显示装置的显示信号从原来每秒60帧提升到现在的每秒120帧，有效地解决了显示装置播放运动画面时出现的残影、拖尾等问题，有利于达到清除上一帧图像的残影、提高动态清晰度的效果，将影像拖尾降至人眼难以感知的程度。
具体的，处理单元包括单数帧存储模块和双数帧存储模块。在显示装置开始工作时，信号源输出第一帧画面信号，处理单元接收第一帧画面信号并存储在单数帧存储模块中。而在信号源输出第二帧画面信号时，处理单元接收第二帧画面信号并存储在双数帧存储模块中。单数帧存储模块和双数帧存储模块轮流输出画面信号。
同时处理单元还包括黑画面生成模块，用于生成黑画面信号。
如图5所示，该驱动系统还包括控制单元，控制单元输出控制信号控制处理器输出画面信号还是黑画面，并且在控制处理单元输出对应黑画面的数据信号时，输出反向偏置信号。
进一步的，驱动电路中的反向偏置单元用于根据反向偏置信号控制OLED和驱动晶体管反向偏置。
为了实现对反向偏置单元的驱动，反向偏置信号包括第一控制信号和第二控制信号，第一控制信号输送给反向偏置单元中的第三晶体管的控制端，第二控制信号输送给第四晶体管的控制端。另外，反向偏置信号还包括阴极驱动信号，阴极驱动信号在第一电平和第 二电平之间转换，第一电平高于第二电平，当处理单元输出对应黑画面的数据信号时，阴极驱动信号为高电平。
具体的，如图6所示，当控制单元输出控制信号Frame_ctrl为高电平时，处理单元输出画面信号，第一控制信号Ctrl1为高电平，第二控制信号Ctrl2为低电平，第一驱动信号V1为高电平，阴极驱动信号V2等于VSS，V3为高电平，第二驱动信号V4为恒定值不变。则显示装置的各栅线G1至Gn开始逐行扫描，在显示装置上显示处理单元输出的画面。
而当控制单元输出控制信号Frame_ctrl为低电平时，处理单元输出黑画面信号，第一控制信号Ctrl1为低电平，第二控制信号Ctrl2为高电平，第一驱动信号V1为低电平，阴极驱动信号V2等于VDD，V3为低电平，第二驱动信号V4为恒定值不变。则显示装置的各栅线G1至Gn开始逐行扫描，在显示装置上显示处理单元输出的黑画面，并且驱动电路中的第二晶体管T2和OLED进入反向偏置状态。
进一步的，由于本实施例中，通过插黑帧实现了倍帧处理，有可能会使画面亮度降低。为了保证显示装置的亮度合适，显示效果理想，如图5所示，本实施例提供的驱动模块还包括分析单元和伽马电压单元。其中，分析单元用于逐帧分析平均图像电平(Average Picture Level，简称APL)；伽马电压单元，当分析单元输出的平均图像电平大于预设值(例如0.3)时，输出第一伽马电压，反之，输出第二伽马电压，其中第一伽马电压小于第二伽马电压。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (9)

  1. 一种适用于OLED的驱动电路，包括与扫描线、数据线连接的用于驱动OLED的驱动单元，还包括与所述OLED连接的反向偏置单元，
    所述反向偏置单元用于在两帧图像之间插入黑画面时，控制所述OLED进行反向偏置。
  2. 根据权利要求1所述的驱动电路，其中，所述驱动单元包括第一晶体管、第二晶体管和存储电容，所述第一晶体管的输出端连接所述存储电容的第一端和所述第二晶体管的控制端，所述存储电容的第二端接入第一驱动信号，所述第二晶体管的输出端连接所述OLED的阳极，所述OLED的阴极接入阴极驱动信号。
  3. 根据权利要求2所述的驱动电路，其中，所述阴极驱动信号在第一电平和第二电平之间转换，所述第一电平与所述第一驱动信号的高电平相等，所述第一电平高于所述第二电平。
  4. 根据权利要求3所述的驱动电路，其中，所述反向偏置单元包括第三晶体管和第四晶体管，其中，所述第三晶体管的控制端接入第一控制信号，所述第三晶体管的输入端连接所述存储电容的第二端，所述第三晶体管的输出端连接所述第二晶体管的输入端，所述第四晶体管的控制端接入第二控制信号，所述第四晶体管的输入端连接所述OLED的阳极，所述第四晶体管的输出端接入第二驱动信号，所述第二驱动信号的幅值小于所述第一驱动信号的幅值，同时所述第二驱动信号的幅值大于第二晶体管的控制端接入的信号的幅值；
    所述第三晶体管断开、所述第四晶体管开启，且所述阴极驱动信号为第二电平时，所述第二晶体管和所述OLED反向偏置。
  5. 一种显示装置的驱动系统，包括驱动电路，该驱动电路包括与扫描线、数据线连接的用于驱动OLED的驱动单元，还包括与所述OLED连接的反向偏置单元，所述反向偏置单元用于在两帧图像之间插入黑画面时，控制所述OLED进行反向偏置；所述驱动系统还包括：
    处理单元，缓存来自信号源的数据信号，通过在相邻两帧数据信号之间插入黑画面对数据信号进行倍帧处理，并向所述显示面板输出倍帧处理后的数据信号；
    控制单元，在所述处理单元输出对应黑画面的数据信号时，输出反向偏置信号；
    其中，所述驱动电路的反向偏置单元，用于根据所述反向偏置信号控制所述OLED和所述驱动晶体管反向偏置。
  6. 根据权利要求5所述的驱动系统，其中，所述反向偏置信号包括第一控制信号和 第二控制信号，所述第一控制信号输送给所述反向偏置单元中的第三晶体管的控制端，所述第二控制信号输送给所述第四晶体管的控制端。
  7. 根据权利要求6所述的驱动系统，其中，所述第一控制信号和所述第二控制信号同频、相位相反。
  8. 根据权利要求5所述的驱动系统，其中，所述反向偏置信号还包括阴极驱动信号，所述阴极驱动信号在第一电平和第二电平之间转换，所述第一电平高于所述第二电平，当所述处理单元输出对应黑画面的数据信号时，所述阴极驱动信号为高电平。
  9. 根据权利要求5所述的驱动系统，其中，还包括：
    分析单元，逐帧分析平均图像电平；
    伽马电压单元，当所述分析单元输出的平均图像电平大于预设值时，输出第一伽马电压，反之，输出第二伽马电压，其中所述第一伽马电压小于所述第二伽马电压。
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