WO2018201544A1 - 像素补偿电路、扫描驱动电路及显示装置 - Google Patents

像素补偿电路、扫描驱动电路及显示装置 Download PDF

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Publication number
WO2018201544A1
WO2018201544A1 PCT/CN2017/086302 CN2017086302W WO2018201544A1 WO 2018201544 A1 WO2018201544 A1 WO 2018201544A1 CN 2017086302 W CN2017086302 W CN 2017086302W WO 2018201544 A1 WO2018201544 A1 WO 2018201544A1
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controllable switch
switch
control
driving
controllable
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PCT/CN2017/086302
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English (en)
French (fr)
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李光
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深圳市华星光电技术有限公司
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Priority to US15/541,369 priority Critical patent/US10460664B2/en
Publication of WO2018201544A1 publication Critical patent/WO2018201544A1/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
    • G09G3/3258—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 voltage across the light-emitting element

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a pixel compensation circuit, a scan driving circuit, and a display device.
  • OLED display devices Due to its excellent color gamut, high contrast ratio, and solid-state devices, OLED display devices have been widely developed in recent years and are becoming more and more competitive in the display field.
  • the current OLED display device basically adopts an active driving mode. Since the organic light emitting diode is a current type device, how to accurately control the current becomes an important consideration.
  • the existing pixel compensation circuit is composed of two thin film transistors and a storage capacitor (shown in FIG. 1).
  • the pixel compensation circuit includes a controllable switch T1, a drive switch T2 and a storage capacitor C1.
  • Vth is the threshold voltage of the drive switch T2. Since the threshold voltage Vth of the driving switch T2 is easily drifted, the organic light emitting diode D1 drives the current fluctuation, so that the brightness display of the OLED display device is uneven, which affects the picture quality.
  • the technical problem to be solved by the present invention is to provide a pixel compensation circuit, a scan driving circuit and a display device to improve the panel brightness display unevenness caused by the deviation of the threshold voltage.
  • a technical solution adopted by the present invention is to provide a pixel compensation circuit, including:
  • the first controllable switch includes a control end, a first end and a second end, the control end of the first controllable switch is connected to the scan line, and the first end of the first controllable switch Connecting the reference voltage terminal;
  • the second controllable switch includes a control end, a first end and a second end, wherein the control end of the second controllable switch is connected to the illumination control end, and the second controllable switch is first Connecting the second end of the first controllable switch;
  • the third controllable switch comprising a control end, a first end and a second end, wherein the a control end of the three controllable switch is connected to the scan line, a first end of the third controllable switch is connected to the data line, and a second end of the third controllable switch is connected to the second end of the second controllable switch end;
  • the driving switch includes a control end, a first end and a second end, and the control end of the driving switch is connected to the second end of the second controllable switch and the second end of the third controllable switch ;
  • An organic light emitting diode comprising an anode and a cathode, an anode of the organic light emitting diode is connected to a second end of the driving switch, and a cathode of the organic light emitting diode is grounded;
  • the fourth controllable switch includes a control end, a first end, and a second end, wherein a control end of the fourth controllable switch is connected to the illumination control end, and the fourth controllable switch is The first end is connected to the first voltage end, and the second end of the fourth controllable switch is connected to the first end of the driving switch;
  • the storage capacitor includes a first end and a second end, the first end of the storage capacitor is connected to the second end of the first controllable switch and the first end of the second controllable switch The second end of the storage capacitor is connected to the second end of the fourth controllable switch and the first end of the drive switch.
  • a technical solution adopted by the present invention is to provide a scan driving circuit, the scan driving circuit includes a pixel compensation circuit, and the pixel compensation circuit includes:
  • the first controllable switch includes a control end, a first end and a second end, the control end of the first controllable switch is connected to the scan line, and the first end of the first controllable switch Connecting the reference voltage terminal;
  • the second controllable switch includes a control end, a first end and a second end, wherein the control end of the second controllable switch is connected to the illumination control end, and the second controllable switch is first Connecting the second end of the first controllable switch;
  • the third controllable switch includes a control end, a first end and a second end, the control end of the third controllable switch is connected to the scan line, and the third controllable switch is One end is connected to the data line, and the second end of the third controllable switch is connected to the second end of the second controllable switch;
  • the driving switch includes a control end, a first end and a second end, and the control end of the driving switch is connected to the second end of the second controllable switch and the second end of the third controllable switch ;
  • An organic light emitting diode comprising an anode and a cathode, an anode of the organic light emitting diode is connected to a second end of the driving switch, and a cathode of the organic light emitting diode is grounded;
  • the fourth controllable switch includes a control end, a first end, and a second end, wherein a control end of the fourth controllable switch is connected to the illumination control end, and the fourth controllable switch is The first end is connected to the first voltage end, and the second end of the fourth controllable switch is connected to the first end of the driving switch;
  • the storage capacitor includes a first end and a second end, the first end of the storage capacitor is connected to the second end of the first controllable switch and the first end of the second controllable switch Storage capacitor The second end is connected to the second end of the fourth controllable switch and the first end of the drive switch.
  • the present invention adopts a technical solution to provide a display device, the display device includes a scan driving circuit, the scan driving circuit includes a pixel compensation circuit, and the pixel compensation circuit includes:
  • the first controllable switch includes a control end, a first end and a second end, the control end of the first controllable switch is connected to the scan line, and the first end of the first controllable switch Connecting the reference voltage terminal;
  • the second controllable switch includes a control end, a first end and a second end, wherein the control end of the second controllable switch is connected to the illumination control end, and the second controllable switch is first Connecting the second end of the first controllable switch;
  • the third controllable switch includes a control end, a first end and a second end, the control end of the third controllable switch is connected to the scan line, and the third controllable switch is One end is connected to the data line, and the second end of the third controllable switch is connected to the second end of the second controllable switch;
  • the driving switch includes a control end, a first end and a second end, and the control end of the driving switch is connected to the second end of the second controllable switch and the second end of the third controllable switch ;
  • An organic light emitting diode comprising an anode and a cathode, an anode of the organic light emitting diode is connected to a second end of the driving switch, and a cathode of the organic light emitting diode is grounded;
  • the fourth controllable switch includes a control end, a first end, and a second end, wherein a control end of the fourth controllable switch is connected to the illumination control end, and the fourth controllable switch is The first end is connected to the first voltage end, and the second end of the fourth controllable switch is connected to the first end of the driving switch;
  • the storage capacitor includes a first end and a second end, the first end of the storage capacitor is connected to the second end of the first controllable switch and the first end of the second controllable switch The second end of the storage capacitor is connected to the second end of the fourth controllable switch and the first end of the drive switch.
  • the beneficial effects of the present invention are: different from the prior art, the pixel compensation circuit, the scan driving circuit and the display device of the present invention use thresholds of the control switch and the organic light emitting diode by using a plurality of controllable switches The voltage deviation is improved to achieve uniform panel brightness display.
  • 1 is a circuit diagram of a conventional pixel compensation circuit.
  • FIG. 2 is a circuit diagram of a first embodiment of a pixel compensation circuit of the present invention.
  • FIG. 3 is a circuit diagram of a second embodiment of a pixel compensation circuit of the present invention.
  • Figure 4 is a timing waveform diagram of Figure 3.
  • Figure 5 is a schematic diagram of the simulation waveform of Figure 3.
  • Figure 6 is a schematic structural view of a scan driving circuit of the present invention.
  • Figure 7 is a schematic view showing the structure of a display device of the present invention.
  • FIG. 2 is a circuit diagram of a first embodiment of the pixel compensation circuit of the present invention.
  • the pixel compensation circuit includes a first controllable switch T1, the first controllable switch T1 includes a control end, a first end, and a second end, and the control end of the first controllable switch T1 is connected to the scan line Scan.
  • the first end of the first controllable switch T1 is connected to the reference voltage terminal Vref;
  • the second controllable switch T2 includes a control end, a first end and a second end, and a control end of the second controllable switch T2 is connected to the illumination control end EM, and the second controllable The first end of the switch T2 is connected to the second end of the first controllable switch T1;
  • the third controllable switch T3 includes a control end, a first end and a second end, and a control end of the third controllable switch T3 is connected to the scan line Scan, the third The first end of the control switch T3 is connected to the data line Data, and the second end of the third controllable switch T3 is connected to the second end of the second controllable switch T2;
  • the driving switch T0 includes a control end, a first end and a second end, the control end of the driving switch T0 is connected to the second end of the second controllable switch T2 and the third controllable switch The second end of T3;
  • An organic light emitting diode D1 the organic light emitting diode D1 includes an anode and a cathode, an anode of the organic light emitting diode D1 is connected to a second end of the driving switch T0, and a cathode of the organic light emitting diode D1 is grounded;
  • the fourth controllable switch T4 includes a control end, a first end and a second end, and a control end of the fourth controllable switch T4 is connected to the illumination control end EM, the fourth The first end of the controllable switch T4 is connected to the first voltage terminal VDD, and the second end of the fourth controllable switch T4 is connected to the first end of the driving switch T0;
  • the storage capacitor C1 includes a first end and a second end, and the first end of the storage capacitor C1 is connected to the second end of the first controllable switch T1 and the second controllable switch T2 The first end of the storage capacitor C1 is connected to the second end of the fourth controllable switch T4 and the first end of the drive switch T0.
  • the switch T4 is a PMOS type thin film transistor, and the control terminal, the first end and the second end of the driving switch T0, the first controllable switch T1 to the fourth controllable switch T4 respectively correspond to the gate of the thin film transistor , drain and source.
  • the drive switch, the first controllable switch to the fourth controllable switch may also be other types of switches as long as the object of the present invention can be achieved.
  • the working principle of the pixel compensation circuit is as follows:
  • the light-emitting control terminal EM and the scan line Scan both output a low-level signal, and the first controllable switch T1 to the fourth controllable switch T4 are both turned on, and the data line Data outputs a low level.
  • point C is low, because the fourth controllable switch T4 is turned on, the point A is the high potential of the first voltage terminal VDD output;
  • the C point is still low, and the point A is still high.
  • the driving switch T0 is turned on.
  • the light emitting control terminal EM outputs a high level signal.
  • the second controllable switch T2 and the fourth controllable switch T4 are both turned off, the scan line Scan outputs a low level signal, and the first controllable switch T1 and the third controllable switch T3 are both turned on, B
  • the point is a high level outputted by the reference voltage terminal Vref
  • the point C is a low level of the data line Data output.
  • VData-Vth Vth ⁇ 0
  • Vth a threshold voltage
  • the threshold voltage Vth of the driving switch T0 is compensated for completion
  • the potentials of the B point and the C point are the same, and the potential of the point A changes from the original VData-Vth to the output voltage of the first voltage terminal VDD, and finally the
  • the voltage Vgs between the gate and source of the driving switch T0 is (Vref - VData + Vth) + VDD, and the final saturation region current is proportional to the square of (Vref - VData), thereby eliminating the deviation of the threshold voltage Vth, resulting in a uniform current , so that the panel brightness is displayed evenly.
  • FIG. 3 is a circuit diagram of a second embodiment of the pixel compensation circuit of the present invention.
  • the second embodiment of the pixel compensation circuit is different from the first embodiment in that the pixel compensation circuit further includes a fifth controllable switch T5, and the fifth controllable switch T5 includes a control end and a first The second end of the fifth controllable switch T5 is connected to the reset signal end Reset, and the first end of the fifth controllable switch T5 is connected to the second end of the driving switch T0 and the organic light emitting The anode of the diode D1, the second end of the fifth controllable switch T5 is connected to the second voltage terminal Vi.
  • the driving switch T0, the first controllable switch T1 to the fifth controllable switch T5 are all PMOS type thin film transistors, the driving switch T0, the first controllable switch T1 to the The control terminal, the first end, and the second end of the fifth controllable switch T5 respectively correspond to the gate of the thin film transistor, Drain and source.
  • the drive switch, the first controllable switch to the fifth controllable switch may also be other types of switches as long as the object of the present invention can be achieved.
  • the working principle of the pixel compensation circuit can be obtained as follows:
  • the light-emitting control terminal EM and the scan line Scan both output a low-level signal, and the first controllable switch T1 to the fourth controllable switch T4 are both turned on, and the data line Data outputs a low level.
  • point C is low, because the fourth controllable switch T4 is turned on, the point A is the high potential of the first voltage terminal VDD output;
  • the driving switch T0 is turned on.
  • the light emitting control terminal EM outputs a high level signal.
  • the second controllable switch T2 and the fourth controllable switch T4 are both turned off, the scan line Scan outputs a low level signal, and the first controllable switch T1 and the third controllable switch T3 are both turned on, B a point is a high level outputted by the reference voltage terminal Vref, and a point C is a low level of the data line Data output.
  • the driving switch T0 is turned on, and the reset signal end is outputting a low level signal.
  • the fifth controllable switch T5 is turned on, and the point A is leaked to the second voltage terminal Vi through the driving switch T0 and the fifth controllable switch T5, and the potential of the final point A is VData-Vth (Vth ⁇ 0), Where Vth is the threshold voltage;
  • the threshold voltage Vth of the driving switch T0 is compensated for completion
  • the potentials of the B point and the C point are the same, and the potential of the point A changes from the original VData-Vth to the output voltage of the first voltage terminal VDD, and finally the
  • the voltage Vgs between the gate and source of the driving switch T0 is (Vref - VData + Vth) + VDD, and the final saturation region current is proportional to the square of (Vref - VData), thereby eliminating the deviation of the threshold voltage Vth, resulting in a uniform current , so that the panel brightness is displayed evenly.
  • FIG. 5 is a schematic diagram of a simulation waveform of a second embodiment of the pixel compensation circuit of the present invention.
  • the potential at point A in the pixel compensation circuit shown in Fig. 3 has a significant threshold voltage Vth capture process.
  • FIG. 6 is a schematic structural diagram of a scan driving circuit of the present invention.
  • the scan driving circuit 2 includes any one of the pixel compensation circuits 1 described above for improving the threshold voltage deviation caused by the scan driving circuit 2, thereby achieving uniform display of panel brightness.
  • Other components and functions of the scan driving circuit are the same as those of the conventional scan driving circuit, and are not described herein again.
  • FIG. 7 is a schematic structural view of a display device of the present invention.
  • the display device 3 can be, for example, an OLED, which includes any one of the foregoing scan driving circuit 2 and a pixel compensation circuit 1
  • the scan driving circuit 2 of the compensation circuit is disposed around the display device 3, for example, at both ends of the display device 3.
  • Other devices and functions in the display device are the same as those of the existing display device, and are not described herein again.
  • the pixel compensation circuit, the scan driving circuit and the display device improve the threshold voltage deviation of the driving switch and the organic light emitting diode by using a plurality of controllable switches, thereby achieving uniform display of panel brightness.

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Abstract

一种像素补偿电路、扫描驱动电路及显示装置。第一及第三开关（T1、T3）的控制端连扫描线（Scan），第一开关（T1）的第一端连参考电压端（Vref），第二端连第二开关（T2）的第一端，第二及第四开关（T2、T4）的控制端连发光控制端（EM），第三开关（T3）的第一端连数据线（Data），第二端连第二开关（T2）的第二端及驱动开关（T0）的控制端，二极管（D1）的阳极连驱动开关（T1）的第二端，第四开关（T4）的第一端连第一电压端（VDD），第二端连驱动开关（T0）的第一端，存储电容（C1）的第一端连第一开关（T1）的第二端，第二端连驱动开关（T0）的第一端。

Description

像素补偿电路、扫描驱动电路及显示装置 【技术领域】
本发明涉及显示技术领域，特别是涉及一种像素补偿电路、扫描驱动电路及显示装置。
【背景技术】
OLED显示装置由于其色域广、对比度高、固态器件等诸多优秀的特性，最近几年得到广泛的发展，在显示领域越来越有竞争力。现在的OLED显示装置基本上采用有源驱动方式，由于有机发光二极管是电流型器件，因此如何精准的控制电流成为重要的考虑方向。
现有的像素补偿电路是由两个薄膜晶体管及一个存储电容(如图1所示)组成，所述像素补偿电路包括一个可控开关T1、一个驱动开关T2和一个存储电容C1。有机发光二极管D1的驱动电流由驱动开关T2控制，其电流大小为：IOLED＝k(Vgs-Vth)2，其中，k为驱动开关T2的电流放大系数，由驱动开关T2本身特性决定，Vth为驱动开关T2的阈值电压。由于驱动开关T2的阈值电压Vth容易漂移，导致有机发光二极管D1驱动电流变动，使得OLED显示装置的亮度显示不均匀，影响画面质量。
【发明内容】
本发明主要解决的技术问题是提供一种像素补偿电路、扫描驱动电路及显示装置，以改善阈值电压的偏差引起的面板亮度显示不均匀问题。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种像素补偿电路，包括：
第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接扫描线，所述第一可控开关的第一端连接参考电压端；
第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接发光控制端，所述第二可控开关的第一端连接所述第一可控开关的第二端；
第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第 三可控开关的控制端连接所述扫描线，所述第三可控开关的第一端连接数据线，所述第三可控开关的第二端连接所述第二可控开关的第二端；
驱动开关，所述驱动开关包括控制端、第一端及第二端，所述驱动开关的控制端连接所述第二可控开关的第二端及所述第三可控开关的第二端；
有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述驱动开关的第二端，所述有机发光二极管的阴极接地；
第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述发光控制端，所述第四可控开关的第一端连接第一电压端，所述第四可控开关的第二端连接所述驱动开关的第一端；及
存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述第一可控开关的第二端及所述第二可控开关的第一端，所述存储电容的第二端连接所述第四可控开关的第二端及所述驱动开关的第一端。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种扫描驱动电路，所述扫描驱动电路包括像素补偿电路，所述像素补偿电路包括：
第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接扫描线，所述第一可控开关的第一端连接参考电压端；
第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接发光控制端，所述第二可控开关的第一端连接所述第一可控开关的第二端；
第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接所述扫描线，所述第三可控开关的第一端连接数据线，所述第三可控开关的第二端连接所述第二可控开关的第二端；
驱动开关，所述驱动开关包括控制端、第一端及第二端，所述驱动开关的控制端连接所述第二可控开关的第二端及所述第三可控开关的第二端；
有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述驱动开关的第二端，所述有机发光二极管的阴极接地；
第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述发光控制端，所述第四可控开关的第一端连接第一电压端，所述第四可控开关的第二端连接所述驱动开关的第一端；及
存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述第一可控开关的第二端及所述第二可控开关的第一端，所述存储电容的 第二端连接所述第四可控开关的第二端及所述驱动开关的第一端。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种显示装置，所述显示装置包括扫描驱动电路，所述扫描驱动电路包括像素补偿电路，所述像素补偿电路包括：
第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接扫描线，所述第一可控开关的第一端连接参考电压端；
第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接发光控制端，所述第二可控开关的第一端连接所述第一可控开关的第二端；
第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接所述扫描线，所述第三可控开关的第一端连接数据线，所述第三可控开关的第二端连接所述第二可控开关的第二端；
驱动开关，所述驱动开关包括控制端、第一端及第二端，所述驱动开关的控制端连接所述第二可控开关的第二端及所述第三可控开关的第二端；
有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述驱动开关的第二端，所述有机发光二极管的阴极接地；
第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述发光控制端，所述第四可控开关的第一端连接第一电压端，所述第四可控开关的第二端连接所述驱动开关的第一端；及
存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述第一可控开关的第二端及所述第二可控开关的第一端，所述存储电容的第二端连接所述第四可控开关的第二端及所述驱动开关的第一端。
本发明的有益效果是：区别于现有技术的情况，本发明的所述像素补偿电路、扫描驱动电路及显示装置通过使用多个可控开关对所述驱动开关及所述有机发光二极管的阈值电压偏差进行改善，以此实现面板亮度显示均匀。
【附图说明】
图1是现有的像素补偿电路的电路示意图。
图2是本发明的像素补偿电路的第一实施例的电路示意图；
图3是本发明的像素补偿电路的第二实施例的电路示意图；
图4是图3的时序波形示意图；
图5是图3的仿真波形示意图；
图6是本发明的扫描驱动电路的结构示意图；
图7本发明的显示装置的结构示意图。
【具体实施方式】
请参阅图2，是本发明的像素补偿电路的第一实施例的电路示意图。所述像素补偿电路包括第一可控开关T1，所述第一可控开关T1包括控制端、第一端及第二端，所述第一可控开关T1的控制端连接扫描线Scan，所述第一可控开关T1的第一端连接参考电压端Vref；
第二可控开关T2，所述第二可控开关T2包括控制端、第一端及第二端，所述第二可控开关T2的控制端连接发光控制端EM，所述第二可控开关T2的第一端连接所述第一可控开关T1的第二端；
第三可控开关T3，所述第三可控开关T3包括控制端、第一端及第二端，所述第三可控开关T3的控制端连接所述扫描线Scan，所述第三可控开关T3的第一端连接数据线Data，所述第三可控开关T3的第二端连接所述第二可控开关T2的第二端；
驱动开关T0，所述驱动开关T0包括控制端、第一端及第二端，所述驱动开关T0的控制端连接所述第二可控开关T2的第二端及所述第三可控开关T3的第二端；
有机发光二极管D1，所述有机发光二极管D1包括阳极及阴极，所述有机发光二极管D1的阳极连接所述驱动开关T0的第二端，所述有机发光二极管D1的阴极接地；
第四可控开关T4，所述第四可控开关T4包括控制端、第一端及第二端，所述第四可控开关T4的控制端连接所述发光控制端EM，所述第四可控开关T4的第一端连接第一电压端VDD，所述第四可控开关T4的第二端连接所述驱动开关T0的第一端；
存储电容C1，所述存储电容C1包括第一端及第二端，所述存储电容C1的第一端连接所述第一可控开关T1的第二端及所述第二可控开关T2的第一端，所述存储电容C1的第二端连接所述第四可控开关T4的第二端及所述驱动开关T0的第一端。
在本实施例中，所述驱动开关T0、所述第一可控开关T1至所述第四可控 开关T4均为PMOS型薄膜晶体管，所述驱动开关T0、第一可控开关T1至所述第四可控开关T4的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。在其他实施例中，所述驱动开关、第一可控开关至所述第四可控开关也可为其他类型的开关，只要能实现本发明的目的即可。
本实施例中，所述像素补偿电路的工作原理如下：
在t1时间段，所述发光控制端EM和扫描线Scan均输出低电平信号，所述第一可控开关T1至第四可控开关T4均导通，数据线Data输出低电平，此时C点为低电位，因为第四可控开关T4导通，所以A点为第一电压端VDD输出的高电位；
在t1阶段完成后，C点依然为低电位，A点依然为高电位，此时驱动开关T0导通，在t2时间段，所述发光控制端EM输出高电平信号，此时所述第二可控开关T2及所述第四可控开关T4均截止，所述扫描线Scan输出低电平信号，所述第一可控开关T1及所述第三可控开关T3均导通，B点为所述参考电压端Vref输出的高电平，C点为所述数据线Data输出的低电平，此时所述驱动开关T0导通，A点通过所述驱动开关T0及所述有机发光二极管D1放电，最终A点电位为VData-Vth(Vth＜0)，其中Vth为阈值电压；
在t2阶段完成后，所述驱动开关T0的阈值电压Vth补偿完成；
最后，所述发光控制端EM再次输出低电平信号后，B点及C点电位相同，同时A点电位由原来的VData-Vth变成所述第一电压端VDD的输出电压，最终所述驱动开关T0的栅源之间的电压Vgs为(Vref-VData+Vth)+VDD，最终饱和区电流正比于(Vref-VData)的平方，从而将阈值电压Vth的偏差消除，产生了均匀的电流，使得面板亮度显示均匀。
请参阅图3，是本发明的像素补偿电路的第二实施例的电路示意图。所述像素补偿电路的第二实施例与上述第一实施例的区别之处在于：所述像素补偿电路还包括第五可控开关T5，所述第五可控开关T5包括控制端、第一端及第二端，所述第五可控开关T5的控制端连接复位信号端Reset，所述第五可控开关T5的第一端连接所述驱动开关T0的第二端及所述有机发光二极管D1的阳极，所述第五可控开关T5的第二端连接第二电压端Vi。
在本实施例中，所述驱动开关T0、所述第一可控开关T1至所述第五可控开关T5均为PMOS型薄膜晶体管，所述驱动开关T0、第一可控开关T1至所述第五可控开关T5的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、 漏极及源极。在其他实施例中，所述驱动开关、所述第一可控开关至所述第五可控开关也可为其他类型的开关，只要能实现本发明的目的即可。
根据图3的像素补偿电路的电路示意图及图4所述的像素补偿电路的时序波形示意图可以获得所述像素补偿电路的工作原理如下：
在t1时间段，所述发光控制端EM和扫描线Scan均输出低电平信号，所述第一可控开关T1至第四可控开关T4均导通，数据线Data输出低电平，此时C点为低电位，因为第四可控开关T4导通，所以A点为第一电压端VDD输出的高电位；
在t1阶段完成后，C点依然为低电位，A点依然为高电位，此时驱动开关T0导通，在t2时间段，所述发光控制端EM输出高电平信号，此时所述第二可控开关T2及所述第四可控开关T4均截止，所述扫描线Scan输出低电平信号，所述第一可控开关T1及所述第三可控开关T3均导通，B点为所述参考电压端Vref输出的高电平，C点为所述数据线Data输出的低电平，此时所述驱动开关T0导通，复位信号端Reset输出低电平信号，所述第五可控开关T5导通，A点通过所述驱动开关T0及所述第五可控开关T5向所述第二电压端Vi漏电，最终A点电位为VData-Vth(Vth＜0)，其中Vth为阈值电压；
在t2阶段完成后，所述驱动开关T0的阈值电压Vth补偿完成；
最后，所述发光控制端EM再次输出低电平信号后，B点及C点电位相同，同时A点电位由原来的VData-Vth变成所述第一电压端VDD的输出电压，最终所述驱动开关T0的栅源之间的电压Vgs为(Vref-VData+Vth)+VDD，最终饱和区电流正比于(Vref-VData)的平方，从而将阈值电压Vth的偏差消除，产生了均匀的电流，使得面板亮度显示均匀。
请参阅图5，是本发明的像素补偿电路的第二实施例的仿真波形示意图。从图5中可以看出，在图3所示的像素补偿电路中的A点的电位有明显的阈值电压Vth抓取的过程。
请参阅图6，是本发明的扫描驱动电路的结构示意图。所述扫描驱动电路2中包括上述像素补偿电路1中的任何一个，用于对所述扫描驱动电路2中造成的阈值电压偏差进行改善，实现面板亮度显示均匀。所述扫描驱动电路的其他元件及功能与现有扫描驱动电路的元件及功能相同，在此不再赘述。
请参阅图7，是本发明的显示装置的结构示意图。所述显示装置3例如可为OLED，其包括前述任一个扫描驱动电路2及像素补偿电路1，所述具有像素补 偿电路的扫描驱动电路2设置在所述显示装置3的周边，例如设置在显示装置3的两端。所述显示装置中的其他器件及功能与现有显示装置的器件及功能相同，在此不再赘述。
所述像素补偿电路、扫描驱动电路及显示装置通过使用多个可控开关对所述驱动开关及所述有机发光二极管的阈值电压偏差进行改善，以此实现面板亮度显示均匀。
以上仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (13)

  1. 一种像素补偿电路，其中，所述像素补偿电路包括：
    第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接扫描线，所述第一可控开关的第一端连接参考电压端；
    第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接发光控制端，所述第二可控开关的第一端连接所述第一可控开关的第二端；
    第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接所述扫描线，所述第三可控开关的第一端连接数据线，所述第三可控开关的第二端连接所述第二可控开关的第二端；
    驱动开关，所述驱动开关包括控制端、第一端及第二端，所述驱动开关的控制端连接所述第二可控开关的第二端及所述第三可控开关的第二端；
    有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述驱动开关的第二端，所述有机发光二极管的阴极接地；
    第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述发光控制端，所述第四可控开关的第一端连接第一电压端，所述第四可控开关的第二端连接所述驱动开关的第一端；及
    存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述第一可控开关的第二端及所述第二可控开关的第一端，所述存储电容的第二端连接所述第四可控开关的第二端及所述驱动开关的第一端。
  2. 根据权利要求1所述的像素补偿电路，其中，所述驱动开关、所述第一可控开关至所述第四可控开关均为PMOS型薄膜晶体管，所述驱动开关、第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。
  3. 根据权利要求1所述的像素补偿电路，其中，所述像素补偿电路还包括第五可控开关，所述第五可控开关包括控制端、第一端及第二端，所述第五可控开关的控制端连接复位信号端，所述第五可控开关的第一端连接所述驱动开关的第二端及所述有机发光二极管的阳极，所述第五可控开关的第二端连接第二电压端。
  4. 根据权利要求3所述的像素补偿电路，其中，所述驱动开关、所述第一 可控开关至所述第五可控开关均为PMOS型薄膜晶体管，所述驱动开关、第一可控开关至所述第五可控开关的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。
  5. 一种扫描驱动电路，其中，所述扫描驱动电路包括像素补偿电路，所述像素补偿电路包括：
    第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接扫描线，所述第一可控开关的第一端连接参考电压端；
    第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接发光控制端，所述第二可控开关的第一端连接所述第一可控开关的第二端；
    第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接所述扫描线，所述第三可控开关的第一端连接数据线，所述第三可控开关的第二端连接所述第二可控开关的第二端；
    驱动开关，所述驱动开关包括控制端、第一端及第二端，所述驱动开关的控制端连接所述第二可控开关的第二端及所述第三可控开关的第二端；
    有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述驱动开关的第二端，所述有机发光二极管的阴极接地；
    第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述发光控制端，所述第四可控开关的第一端连接第一电压端，所述第四可控开关的第二端连接所述驱动开关的第一端；及
    存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述第一可控开关的第二端及所述第二可控开关的第一端，所述存储电容的第二端连接所述第四可控开关的第二端及所述驱动开关的第一端。
  6. 根据权利要求5所述的扫描驱动电路，其中，所述驱动开关、所述第一可控开关至所述第四可控开关均为PMOS型薄膜晶体管，所述驱动开关、第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。
  7. 根据权利要求5所述的扫描驱动电路，其中，所述像素补偿电路还包括第五可控开关，所述第五可控开关包括控制端、第一端及第二端，所述第五可控开关的控制端连接复位信号端，所述第五可控开关的第一端连接所述驱动开关的第二端及所述有机发光二极管的阳极，所述第五可控开关的第二端连接第 二电压端。
  8. 根据权利要求7所述的扫描驱动电路，其中，所述驱动开关、所述第一可控开关至所述第五可控开关均为PMOS型薄膜晶体管，所述驱动开关、第一可控开关至所述第五可控开关的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。
  9. 一种显示装置，其中，所述显示装置包括扫描驱动电路，所述扫描驱动电路包括像素补偿电路，所述像素补偿电路包括：
    第一可控开关，所述第一可控开关包括控制端、第一端及第二端，所述第一可控开关的控制端连接扫描线，所述第一可控开关的第一端连接参考电压端；
    第二可控开关，所述第二可控开关包括控制端、第一端及第二端，所述第二可控开关的控制端连接发光控制端，所述第二可控开关的第一端连接所述第一可控开关的第二端；
    第三可控开关，所述第三可控开关包括控制端、第一端及第二端，所述第三可控开关的控制端连接所述扫描线，所述第三可控开关的第一端连接数据线，所述第三可控开关的第二端连接所述第二可控开关的第二端；
    驱动开关，所述驱动开关包括控制端、第一端及第二端，所述驱动开关的控制端连接所述第二可控开关的第二端及所述第三可控开关的第二端；
    有机发光二极管，所述有机发光二极管包括阳极及阴极，所述有机发光二极管的阳极连接所述驱动开关的第二端，所述有机发光二极管的阴极接地；
    第四可控开关，所述第四可控开关包括控制端、第一端及第二端，所述第四可控开关的控制端连接所述发光控制端，所述第四可控开关的第一端连接第一电压端，所述第四可控开关的第二端连接所述驱动开关的第一端；及
    存储电容，所述存储电容包括第一端及第二端，所述存储电容的第一端连接所述第一可控开关的第二端及所述第二可控开关的第一端，所述存储电容的第二端连接所述第四可控开关的第二端及所述驱动开关的第一端。
  10. 根据权利要求9所述的显示装置，其中，所述驱动开关、所述第一可控开关至所述第四可控开关均为PMOS型薄膜晶体管，所述驱动开关、第一可控开关至所述第四可控开关的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。
  11. 根据权利要求9所述的显示装置，其中，所述像素补偿电路还包括第五可控开关，所述第五可控开关包括控制端、第一端及第二端，所述第五可控开 关的控制端连接复位信号端，所述第五可控开关的第一端连接所述驱动开关的第二端及所述有机发光二极管的阳极，所述第五可控开关的第二端连接第二电压端。
  12. 根据权利要求11所述的显示装置，其中，所述驱动开关、所述第一可控开关至所述第五可控开关均为PMOS型薄膜晶体管，所述驱动开关、第一可控开关至所述第五可控开关的控制端、第一端及第二端分别对应所述薄膜晶体管的栅极、漏极及源极。
  13. 根据权利要求9所述的显示装置，其中，所述显示装置为OLED。
PCT/CN2017/086302 2017-05-02 2017-05-27 像素补偿电路、扫描驱动电路及显示装置 WO2018201544A1 (zh)

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