WO2015168954A1 - 一种像素驱动电路及其驱动方法、显示面板 - Google Patents

一种像素驱动电路及其驱动方法、显示面板 Download PDF

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Publication number
WO2015168954A1
WO2015168954A1 PCT/CN2014/077380 CN2014077380W WO2015168954A1 WO 2015168954 A1 WO2015168954 A1 WO 2015168954A1 CN 2014077380 W CN2014077380 W CN 2014077380W WO 2015168954 A1 WO2015168954 A1 WO 2015168954A1
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Prior art keywords
transistor
light emitting
emitting diode
organic light
turning
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Ceased
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PCT/CN2014/077380
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English (en)
French (fr)
Inventor
徐向阳
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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 claimed from CN201410193937.5A external-priority patent/CN103985351B/zh
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/384,475 priority Critical patent/US9626910B2/en
Publication of WO2015168954A1 publication Critical patent/WO2015168954A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • 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
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    • 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]
    • G09G3/3266—Details of drivers for scan electrodes
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    • 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]
    • G09G3/3275—Details of drivers for data electrodes
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Definitions

  • the present invention relates to the field of organic light emitting display technologies, and in particular, to a pixel driving circuit, a driving method thereof, and a display panel.
  • AMOLED Active Matrix Organic Type Light Emitting Diode
  • many effects can cause panel uniformity to deteriorate. Since the brightness of the AMOLED display panel is proportional to the current of the organic light emitting diode, the current level affects the display uniformity of the AMOLED display panel. If the unevenness is controlled within a range of about ⁇ 1%, the AMOLED display panel is required. The current is controlled within ⁇ 1%. Since most integrated circuits only transmit voltage signals instead of current signals, it is difficult to control the brightness of the pixel to ⁇ 1% in the AMOLED display panel, which needs to convert the voltage signal into a current signal and then transform The result is stored in pixels within one frame period. In fact, since the threshold voltage and mobility of the transistors of the AMOLED display panel are shifted with time, these disadvantages may cause unevenness in brightness of the display panel.
  • FIG. 1 is a circuit diagram of a pixel driving circuit of a conventional AMOLED display panel.
  • the pixel driving circuit 10 of the AMOLED display panel mainly includes a first transistor (TFT1) 102, a second transistor (TFT2) 104, a control capacitor (C) 106, and a scan line (Gate). n) 108 and data line (Data n) 110.
  • the pixel driving circuit 10 of the conventional AMOLED display panel does not include a compensation circuit. If the components of the AMOLED display panel are mutated, the driving voltage and the carrier mobility change together, and the pixels of the AMOLED display panel are changed. The drive circuit 10 cannot compensate for variations in the carrier mobility.
  • An object of the present invention is to design a pixel driving circuit of an AMOLED, so that the current flowing through the organic light emitting diode is independent of the threshold voltage, thereby improving the uniformity and stability of the brightness of the display panel.
  • the present invention constructs a pixel driving circuit including a first transistor, a second transistor, a third transistor, a first capacitor, a second capacitor, and an organic light emitting diode, wherein the first transistor is the scan line
  • the second transistor is a driving switch of the organic light emitting diode
  • the first capacitor is configured to store a data signal gray scale voltage transmitted by the data line, thereby controlling the second transistor to the organic light emitting a driving current of the diode
  • the compensation circuit comprising: a third transistor having a source connected to the first capacitor and the second capacitor, a drain connected to a source of the second transistor; a fourth transistor having a source The ground is connected to the drain of the second transistor and the drain of the third transistor, and the gate of the third transistor and the gate of the fourth transistor are used to receive a compensation control voltage.
  • the third transistor is an N-channel field effect transistor
  • the fourth transistor is a P-channel field effect transistor
  • Another object of the present invention is to design a compensation method for a pixel driving circuit of an active matrix organic light emitting diode display panel, so that the uniformity and stability of the luminance of the display panel are controlled within an allowable range.
  • the present invention constructs a driving method of a pixel driving circuit, comprising: turning off the first transistor, turning on the third transistor, turning off the fourth transistor, and compensating the first a threshold voltage of the two transistors; turning on the first transistor, turning off the third transistor, turning on the fourth transistor, charging the first capacitor; turning off the first transistor and the third transistor And turning on the second transistor, the fourth transistor, and the organic light emitting diode to cause the organic light emitting diode to emit light.
  • turning off the first transistor, turning on the third transistor, turning off the fourth transistor, and compensating for a threshold voltage of the second transistor specifically includes: inputting a low voltage level Up to the scan line, the compensation control voltage is at a high voltage level to turn off the first transistor, turn on the third transistor, turn off the fourth transistor, and compensate the second transistor Threshold voltage.
  • turning on the first transistor, turning off the third transistor, turning on the fourth transistor, and charging the first capacitor specifically includes: inputting a high voltage level to the a scan line, inputting a high voltage level to the data line, causing the compensation control voltage to be a low voltage level to turn on the first transistor, turn off the third transistor, and turn on the fourth transistor , charging the first capacitor.
  • turning off the first transistor and the third transistor, turning on the second transistor, the fourth transistor, and the organic light emitting diode, and causing the organic light emitting diode to emit light specifically includes: inputting low voltage electricity Up to the scan line, inputting a high voltage level to the power line, causing the compensation control voltage to be a low voltage level to turn off the first transistor and the third transistor, and turn on the second transistor And a fourth transistor and an organic light emitting diode to cause the organic light emitting diode to emit light.
  • the present invention constructs a display panel including the above-described pixel driving circuit.
  • the pixel driving circuit is formed on an array substrate, wherein the array substrate is provided with a plurality of data lines and gate lines, and the plurality of data lines and gate lines define a plurality of
  • the pixel driving circuit further includes a driving chip configured to provide a timing signal for the data line, the gate line, and the compensation control voltage, and provide a power signal for the power line.
  • the display panel is an active matrix organic light emitting diode display panel.
  • the brightness of the display panel is determined by the current flowing through the organic light emitting diode.
  • the drift of the threshold voltage of the AMOLED is compensated, thereby improving the gray scale of the organic light emitting diode and the uniformity of the picture.
  • FIG. 1 is a circuit diagram showing a pixel driving circuit of a conventional AMOLED display panel
  • FIG. 2 is a circuit diagram showing a pixel driving circuit of an AMOLED display panel according to an embodiment of the present invention
  • FIG. 3 is a timing diagram of a pixel driving circuit of an AMOLED display panel according to an embodiment of the present invention.
  • 4A to 4C are diagrams showing the conduction of the pixel driving circuit of the present invention.
  • FIG. 5 is a flow chart showing a method of compensating driving of a pixel driving circuit of an AMOLED display panel of the present invention.
  • FIG. 2 is a circuit diagram showing a pixel driving circuit of an AMOLED display panel according to an embodiment of the present invention.
  • the pixel driving circuit is formed on the array substrate.
  • the array substrate is provided with a plurality of data lines and gate lines, and the plurality of data lines and the plurality of gate lines define a plurality of pixel driving circuits.
  • the array substrate further includes a driving chip for providing timing signals for the data lines, the gate lines, and the compensation control voltage, and providing power signals for the power lines. As shown in FIG.
  • the pixel driving circuit 20 of the AMOLED display panel of the present invention is 4T2C (four transistors (Thin Film Transistor (TFT) and two capacitors, which mainly include a first transistor (TFT1) 202, a second transistor (TFT2) 204, a first capacitor (C1) 206, a second capacitor (C2) 207, and a scan line (Gate).
  • Line 208, data line (Data Line) 210, an organic light emitting diode (OLED) 212 and a compensation circuit 214.
  • the first transistor 202 is a switch of the scan line 208, the gate of the first transistor 202 is connected to the scan line 208, the drain is connected to the data line 210, and the source is connected to one end of the first capacitor 206.
  • the second transistor 204 is a driving switch of the organic light emitting diode 212, the drain of the second transistor 204 is connected to the cathode of the organic light emitting diode 212, and the gate thereof is connected to the other end of the first capacitor 206.
  • the anode of the organic light emitting diode 212 is connected to a power supply line.
  • the first capacitor 206 is used to store the data signal gray scale voltage transmitted by the data line 210, thereby controlling the driving current of the second transistor 204 to the organic light emitting diode 212.
  • the scan line 208 is used to transmit a scan signal to the transistor to control the turning on and off of the first transistor 202.
  • Data line 210 is used to transmit a data signal to second transistor 204.
  • the compensation circuit 214 includes a third transistor 2142 and a fourth transistor 2144. The source of the second transistor 204 is connected to the drains of the third transistor 2142 and the fourth transistor 2144, respectively.
  • the source of the third transistor 2142 is connected to the drain of the second transistor 204, and the gate of the third transistor 2142 is connected to the gate of the fourth transistor 2144 to receive the compensation control voltage Ctl. n, the source of the fourth transistor 2144 is grounded.
  • the first transistor 202, the second transistor 204, and the third transistor 2142 are N-channel field effect transistor (NMOS) transistors, and the fourth transistor 2144 is a P-channel field effect.
  • NMOS N-channel field effect transistor
  • PMOS Transistor
  • the NMOS transistor in the embodiment can also be changed to a PMOS transistor, and the PMOS transistor is changed to an NMOS transistor, which is not limited herein.
  • FIG. 3 is a timing diagram of a pixel driving circuit of an AMOLED display panel according to an embodiment of the present invention.
  • this time phase is also referred to as a compensation phase of the threshold voltage Vth, and a low voltage level is input to the scan line 208, and the compensation control voltage Ctl is n is a high voltage level to turn off the first transistor 204, turn on the third transistor 2142, turn off the fourth transistor 2144, and at this time, the gate voltage of the second transistor 204 is the threshold voltage Vth, so that in the first stage t1
  • the threshold voltage Vth of the second transistor 204 can be compensated as shown in FIG. 4A.
  • this phase is the charging period of the first capacitor.
  • the signal of the data line 210 will pass to the gate of the second transistor 204 and begin to charge the first capacitor 206, as shown in FIG. 4B.
  • the gate voltage of the second transistor 204 is (Vdd - Vdata) * C1/(C1 + C2) + Vth, where Vdd is the driving voltage, Vdata is the signal voltage of the data line 210, and the second transistor 204 is turned on. status.
  • the current I flowing through the organic light emitting diode 212 is independent of the threshold voltage Vth, so that the uniformity of the brightness of the display panel is stabilized and does not deviate from the threshold voltage. Moved and unstable.
  • a low voltage level is input to the scan line 208, a high voltage level is input to the power line, and the compensation control voltage Ctl is input.
  • n is a low voltage level, turning off the first transistor 204, turning off the third transistor 2142, turning on the fourth transistor 2144, and at this stage, the organic light emitting diode 212 in the pixel driving circuit 20 starts to emit light.
  • the uniformity of the display panel is improved.
  • FIG. 5 is a flow chart showing a method of compensating a pixel driving circuit of an AMOLED display panel of the present invention.
  • the pixel driving circuit 20 of the AMOLED also includes a first transistor (TFT1) 202, a second transistor 204, a first capacitor (C1) 206, a second capacitor (C2) 207, and a scan line (Gate). Line) 208, Data Line 210, Organic Light Emitting Diode, OLED) 212 and compensation circuit 214.
  • the compensation circuit 214 includes a third transistor 2142 and a fourth transistor 2144. As shown in FIG.
  • step S502 the first transistor 202 is turned off, the third transistor 2142 is turned on, and the fourth transistor 2144 is turned off to compensate the threshold voltage of the second transistor 204.
  • This phase is also known as the threshold voltage compensation time.
  • a low voltage level is input to the scan line 208 such that the compensation control voltage is at a high voltage level and the gate voltage value of the second transistor 204 is a threshold voltage Vth.
  • step S504 the first transistor 202 is turned on, the third transistor 2142 is turned off, and the fourth transistor 2144 is turned on to charge the first capacitor 206.
  • Input a high voltage level to the scan line 208, input a high voltage level to the data line 210, and make the compensation control voltage Ctl n is a low voltage level, so the signal of the data line 210 will be transmitted to the gate of the second transistor 204, and the current flowing through the organic light emitting diode 212 is I 1/2*Cx*(u*W/L) *((Vdd-Vdata)*C1/(C1+C2))2.
  • the current I flowing through the organic light emitting diode 212 is independent of the threshold voltage Vth.
  • the current I flowing through the organic light emitting diode 212 is made independent of the threshold voltage Vth, and therefore the current I flowing through the organic light emitting diode 212 is not due to the valve.
  • the drift of the value voltage Vth causes the luminance of the AMOLED display panel to be uneven.
  • step S506 a low voltage level is input to the scan line 208, and a high voltage level is input to the power line to make the compensation control voltage Ctl.
  • n is a low voltage level, turning off the first transistor 204 and the third transistor 2142, and turning on the second transistor 207, the fourth transistor 2144, and the organic light emitting diode 212.
  • the organic light emitting diode 212 is caused to start to emit light.
  • the uniformity of the display panel is improved.
  • the threshold voltage Vth of the second transistor is compensated, and the current flowing through the organic light emitting diode 212 is independent of the threshold voltage Vth.
  • the invention has the beneficial effects that the drift of the threshold voltage of the AMOLED is compensated from the driving design of the AMOLED display panel, thereby improving the uniformity of the gray scale and the picture of the organic light emitting diode.

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Abstract

一种像素驱动电路（20），其包括第一晶体管（202）、第二晶体管（204）、第三晶体管（2142）、第四晶体管（2144）、第一电容（206）、第二电容（207）和有机发光二极管（212），第一晶体管（202）的栅极连接扫描线（208），第一晶体管（202）的漏极连接数据线（210），第一晶体管（202）的源级连接第一电容（206）的一端，第一电容（206）的另一端连接第二晶体管（204）的栅极，第二晶体管（204）的漏极连接有机发光二极管（212）的阴极，有机发光二极管（212）的阳极用于连接电源线，第二晶体管（204）的源极分别连接第三晶体管（2142）的漏极和第四晶体管（2144）的漏极，第三晶体管（2142）的源极连接第二晶体管（204）的栅极，第三晶体管（2142）的栅极和第四晶体管（2144）的栅极用于接收补偿控制电压，第四晶体管（2144）的源极接地。该像素驱动电路可补偿有机发光二极管（212）的阀值电压的漂移，进而提高有机发光二极管（212）灰阶和画面的均一性。

Description

一种像素驱动电路及其驱动方法、显示面板 技术领域
本发明涉及有机发光显示技术领域，具体地，涉及一种像素驱动电路及其驱动方法、显示面板。
 背景技术
在主动矩阵式有机发光二极管(Active Matrix Organic Type Light Emitting Diode, AMOLED)显示面板中，许多效应会造成面板的均匀性变差。因为AMOLED显示面板的亮度与有机发光二极管的电流成正比，电流的准位会影响AMOLED显示面板的显示均匀度，若要将不均匀性控制在约±1％的范围内，需要将AMOLED显示面板的电流控制在±1％的范围内。由于大部分的集成电路都只传输电压信号，而不是电流信号，所以在AMOLED显示面板中，要控制像素的亮度在±1％是困难的，其需将电压信号转变成电流信号，然后将转变结果在一帧周期内储存在像素内。事实上，由于AMOLED显示面板的晶体管的阀值电压和迁移率会随着时间偏移，这些缺点会造成显示面板亮度的不均匀性。
图1为传统的AMOLED显示面板的像素驱动电路图。AMOLED显示面板的像素驱动电路10主要包括第一晶体管(TFT1)102、第二晶体管(TFT2)104、控制电容(C)106、扫描线(Gate n)108与数据线(Data n)110。如图1所示，传统的AMOLED显示面板的像素驱动电路10中并没有包括补偿电路，若AMOLED显示面板的组件发生变异时，驱动电压与载子移动率会一起改变，而AMOLED显示面板的像素驱动电路10并无法补偿载子移动率的变化。
因此，如上所述，存在一种需求，设计一种AMOLED显示面板的像素驱动电路的补偿电路，使显示屏发光亮度的均匀性和稳定性控制在可容许的范围内。
 技术问题
本发明的一个目的在于设计一种AMOLED的像素驱动电路，使流过有机发光二极管的电流与阀值电压无关，进而改善显示面板亮度的均匀性与稳定性。
 技术解决方案
本发明构造了一种像素驱动电路，所述像素驱动电路包括第一晶体管、第二晶体管、第三晶体管、第一电容、第二电容和有机发光二极管，所述第一晶体管为所述扫描线的开关，所述第二晶体管为所述有机发光二极管的驱动开关，所述第一电容用于储存所述数据线传输的数据信号灰阶电压，进而控制所述第二晶体管对所述有机发光二极管的驱动电流，所述补偿电路包括：第三晶体管，其源极连接所述第一电容与所述第二电容，漏极连接所述第二晶体管的源极；第四晶体管，其源极接地，漏极连接所述第二晶体管的所述源极与所述第三晶体管的漏极，而所述第三晶体管的栅极与所述第四晶体管的栅极用于接收补偿控制电压。
在本发明一实施例中，所述第三晶体管为N沟道场效应晶体管，所述第四晶体管为P沟道场效应晶体管。
本发明的另一个目的在于设计一种主动矩阵式有机发光二极管显示面板的像素驱动电路的补偿方法，使显示面板发光亮度的均匀性和稳定性控制在可容许的范围内。
为解决上述技术问题，本发明构造了一种像素驱动电路的驱动方法，其包括：关断所述第一晶体管，导通所述第三晶体管，关断所述第四晶体管，补偿所述第二晶体管的阀值电压；导通所述第一晶体管，关断所述第三晶体管，导通所述第四晶体管，为所述第一电容充电；关断所述第一晶体管和第三晶体管，导通所述第二晶体管、第四晶体管和有机发光二极管，使所述有机发光二极管发光。
在本发明一实施例中，关断所述第一晶体管，导通所述第三晶体管，关断所述第四晶体管，补偿所述第二晶体管的阀值电压具体包括：输入低电压电平至所述扫描线，使所述补偿控制电压为高电压电平，以关断所述第一晶体管，导通所述第三晶体管，关断所述第四晶体管，补偿所述第二晶体管的阀值电压。
在本发明一实施例中，导通所述第一晶体管，关断所述第三晶体管，导通所述第四晶体管，为所述第一电容充电具体包括：输入高电压电平至所述扫描线，输入高电压电平至所述数据线，使所述补偿控制电压为低电压电平，以导通所述第一晶体管，关断所述第三晶体管，导通所述第四晶体管，为所述第一电容充电。
在本发明一实施例中，关断所述第一晶体管和第三晶体管，导通所述第二晶体管、第四晶体管和有机发光二极管，使所述有机发光二极管发光具体包括：输入低电压电平至所述扫描线，输入高电压电平至所述电源线，使所述补偿控制电压为低电压电平，以关断所述第一晶体管和第三晶体管，导通所述第二晶体管、第四晶体管和有机发光二极管，使所述有机发光二极管发光。
为解决上述技术问题，本发明构造了一种显示面板，包括上述的像素驱动电路。
在本发明一实施例中，所述像素驱动电路形成于阵列基板上，所述阵列基板上设置有多条数据线和栅极线，所述多条数据线和栅极线限定了多个所述像素驱动电路；所述阵列基板还包括驱动芯片，用于为所述数据线、栅极线和补偿控制电压提供时序信号，为所述电源线提供电源信号。
在本发明一实施例中，所述显示面板为主动矩阵式有机发光二极管显示面板。
在本发明一实施例中，所述显示面板的亮度由流过所述有机发光二极管的电流决定。
 有益效果
从设计一种AMOLED显示面板的驱动设计上，补偿了AMOLED的阀值电压的漂移，进而提高有机发光二极管灰阶和画面的均一性。
 附图说明
图1显示传统AMOLED显示面板的像素驱动电路的电路图；
图2显示本发明实施例的AMOLED显示面板的像素驱动电路的电路图；
图3为本发明实施例的AMOLED显示面板的像素驱动电路的时序图；
图4A至图4C显示本发明的像素驱动电路的导通示意图；
图5显示本发明的AMOLED显示面板的像素驱动电路的补偿驱动方法的流程图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
图2显示本发明实施例的AMOLED显示面板的像素驱动电路图。像素驱动电路形成于阵列基板上，阵列基板上设置有多条数据线和栅极线，多条数据线和多条栅极线限定了多个像素驱动电路。另外，阵列基板还包括驱动芯片，用于为数据线、栅极线和补偿控制电压提供时序信号，为电源线提供电源信号。如图2所示，本发明的AMOLED显示面板的像素驱动电路20为4T2C(四个晶体管(Thin Film Transistor，TFT)以及二个电容)电路，其主要包括第一晶体管(TFT1)202、第二晶体管(TFT2)204、第一电容(C1)206、第二电容(C2)207、扫描线(Gate Line)208、数据线(Data Line)210、有机发光二极管(OLED)212与补偿电路214。第一晶体管202为扫描线208的开关，第一晶体管202的栅极连接扫描线208，漏极连接数据线210，而源极连接第一电容206的一端。第二晶体管204为有机发光二极管212的驱动开关，第二晶体管204的漏极连接到有机发光二极管212的阴极，而其栅极连接到第一电容206的另一端。有机发光二极管212的阳极连接电源线。第一电容206用于储存数据线210传输的数据信号灰阶电压，进而控制第二晶体管204对有机发光二极管212的驱动电流。扫描线208用于传送扫描信号至晶体管，控制第一晶体管202的开启与关闭。数据线210用于传送数据信号给第二晶体管204。而补偿电路214包括第三晶体管2142与第四晶体管2144，第二晶体管204的源极分别连接第三晶体管2142与第四晶体管2144的漏极。第三晶体管2142的源极连接第二晶体管204的漏极，第三晶体管2142的栅极连接第四晶体管2144的栅极以接收补偿控制电压Ctl n，第四晶体管2144的源极接地。藉由补偿控制电压Ctl n控制第三晶体管2142与第四晶体管2144的开启与关闭，让流过有机发光二极管212的电流与第二晶体管204的阀值电压Vth无关，达到改善AMOLED显示面板的亮度问题，显示面板的均匀度将可以有效提升。另外，在此需要说明的是，在此实施例中，第一晶体管202、第二晶体管204与第三晶体管2142为N沟道场效应晶体管(NMOS)晶体管，而第四晶体管2144为P沟道场效应晶体管(PMOS)晶体管，但是在不同实施例中，也可以将实施例中的NMOS晶体管改为PMOS晶体管，而PMOS晶体管改为NMOS晶体管，在此并不局限。
图3为本发明实施例的AMOLED显示面板的像素驱动电路的时序图。如图3所示，在第一阶段t1，此时间阶段又称为阀值电压Vth的补偿阶段，输入低电压电平至扫描线208，而补偿控制电压Ctl n为高电压电平，以关断第一晶体管204，导通第三晶体管2142，关断第四晶体管2144，此时第二晶体管204的栅极电压为阈值电压Vth，从而在第一阶段t1可补偿第二晶体管204的阀值电压Vth，如图4A所示。在第二阶段t2，在此阶段为第一电容的充电期间。输入高电压电平至扫描线208，输入高电压电平至数据线210，使补偿控制电压Ctl n为低电压电平，导通第一晶体管204，关断第三晶体管2142，导通第四晶体管2144。当第一晶体管202为导通状态，数据线210的信号将会传递至第二晶体管204的栅极，且开始为第一电容206充电，如图4B所示。而此时第二晶体管204的栅极电压为(Vdd-Vdata)*C1/(C1+C2)+Vth，其中Vdd为驱动电压，Vdata为数据线210的信号电压，第二晶体管204为导通的状态。根据晶体管的电流公式：I=1/2*Cx*(u*W/L)*(Vg-Vth)2，其中，Cx为晶体管的栅氧层单位面积电容，u为晶体管的电子迁移率，W为晶体管的宽度，L为晶体管的长度，可以得知流过有机发光二极管212的电流为I=1/2*Cx*(u*W/L)*((Vdd-Vdata)*C1/(C1+C2))2，由电流公式中可以得知，通过有机发光二极管212的电流I与阀值电压Vth无关。藉由第三晶体管2142与第四晶体管2144的设计，让流过有机发光二极管212的电流I与阀值电压Vth无关，使显示面板发光亮度的均匀性稳定，不会随着阀值电压的偏移而不稳定。接着，在第三阶段t3，输入低电压电平至扫描线208，输入高电压电平至电源线，而补偿控制电压Ctl n为低电压电平，关断第一晶体管204，关断第三晶体管2142，导通第四晶体管2144，在此阶段，像素驱动电路20中的有机发光二极管212开始发光。透过上述的驱动方法，改善显示面板的均匀度。
图5显示本发明的AMOLED显示面板的像素驱动电路的补偿方法的流程图。下列的叙述是配合图3的组件符号作说明。此AMOLED的像素驱动电路20同样包括第一晶体管(TFT1)202、第二晶体管204、第一电容(C1)206、第二电容(C2)207、扫描线(Gate Line)208、数据线(Data Line)210、有机发光二极管(Organic Light Emitting Diode，OLED)212与补偿电路214。而补偿电路214包括第三晶体管2142与第四晶体管2144。如图5所示，在步骤S502中，关断第一晶体管202，导通第三晶体管2142，关断第四晶体管2144，补偿第二晶体管204的阀值电压。此阶段又称为阀值电压补偿时间。在此阶段，输入低电压电平至扫描线208，使补偿控制电压为高电压电平，第二晶体管204的栅极电压值为阀值电压Vth。在步骤S504中，导通第一晶体管202，关断第三晶体管2142，导通第四晶体管2144，为第一电容206充电。输入高电压电平至扫描线208，输入高电压电平至数据线210，使补偿控制电压Ctl n为低电压电平，因此数据线210的信号将会传递至第二晶体管204的栅极，而流过有机发光二极管212的电流为I=1/2*Cx*(u*W/L)*((Vdd-Vdata)*C1/(C1+C2))2。由上述的电流公式可以明显看出，在公式中并没有阀值电压Vth，流过有机发光二极管212的电流I与阀值电压Vth无关。透过上述的补偿驱动方法，在AMOLED显示面板的像素驱动电路20中，让流过有机发光二极管212的电流I与阀值电压Vth无关，因此流过有机发光二极管212的电流I不会因为阀值电压Vth的漂移，造成AMOLED显示面板发光亮度不均匀。接着，在步骤S506中，输入低电压电平至扫描线208，输入高电压电平至电源线，使补偿控制电压Ctl n为低电压电平，关断第一晶体管204与第三晶体管2142，导通第二晶体管207、第四晶体管2144与有机发光二极管212。在此阶段，使有机发光二极管212开始发光。透过上述的驱动方法，改善显示面板的均匀度。
如上所述，透过在AMOLED显示面板的像素驱动电路中加入第三晶体管与第四晶体管，补偿第二晶体管的阀值电压Vth，让流过有机发光二极管212的电流与阀值电压Vth无关。本发明的有益效果为：从AMOLED显示面板的驱动设计上，补偿了AMOLED的阀值电压的漂移，从而提高有机发光二极管灰阶与画面的均一性。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。
 本发明的实施方式
工业实用性
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  1. 一种像素驱动电路，包括第一晶体管、第二晶体管、第三晶体管、第四晶体管、第一电容、第二电容和有机发光二极管，所述第一晶体管的栅极连接扫描线,所述第一晶体管的漏极连接数据线,所述第一晶体管的源级连接所述第一电容的一端,所述第一电容的另一端连接所述第二晶体管的栅极,所述第二晶体管的漏极连接所述有机发光二极管的阴极,所述有机发光二极管的阳极用于连接电源线,所述第二晶体管的源极分别连接所述第三晶体管的漏极和所述第四晶体管的漏极，所述第三晶体管的源极连接所述第二晶体管的栅极，所述第三晶体管的栅极和所述第四晶体管的栅极用于接收补偿控制电压，所述第四晶体管的源极接地，其中所述补偿控制电压用于控制所述第三晶体管与所述第四晶体管的开启与关闭，让流过所述有机发光二极管的电流与所述第二晶体管的阀值电压无关。
  2. 根据权利要求1所述的像素驱动电路，其中所述第三晶体管为N沟道场效应晶体管，所述第四晶体管为P沟道场效应晶体管。
  3. 根据权利要求1所述的像素驱动电路，其中当所述第一晶体管关断、所述第三晶体管导通、及所述第四晶体管关断时，所述第二晶体管的阀值电压被补偿。
  4. 根据权利要求1所述的像素驱动电路，其中当所述第一晶体管导通、所述第三晶体管关断、及所述第四晶体管导通时，所述第一电容被充电。
  5. 根据权利要求1所述的像素驱动电路，其中当所述第一晶体管和第三晶体管关断，所述第二晶体管、第四晶体管和有机发光二极管导通时，所述有机发光二极管发光。
  6. 一种如权利要求1或2所述的像素驱动电路的驱动方法，其中所述驱动方法包括：
    关断所述第一晶体管，导通所述第三晶体管，关断所述第四晶体管，补偿所述第二晶体管的阀值电压；
    导通所述第一晶体管，关断所述第三晶体管，导通所述第四晶体管，为所述第一电容充电；
    关断所述第一晶体管和第三晶体管，导通所述第二晶体管、第四晶体管和有机发光二极管，使所述有机发光二极管发光。
  7. 根据权利要求6所述的驱动方法，其中所述关断所述第一晶体管，导通所述第三晶体管，关断所述第四晶体管，补偿所述第二晶体管的阀值电压具体包括：
    输入低电压电平至所述扫描线，使所述补偿控制电压为高电压电平，以关断所述第一晶体管，导通所述第三晶体管，关断所述第四晶体管，补偿所述第二晶体管的阀值电压。
  8. 根据权利要求7所述的驱动方法，其中所述导通所述第一晶体管，关断所述第三晶体管，导通所述第四晶体管，为所述第一电容充电具体包括：
    输入高电压电平至所述扫描线，输入高电压电平至所述数据线，使所述补偿控制电压为低电压电平，以导通所述第一晶体管，关断所述第三晶体管，导通所述第四晶体管，为所述第一电容充电。
  9. 根据权利要求8所述的驱动方法，其中所述关断所述第一晶体管和第三晶体管，导通所述第二晶体管、第四晶体管和有机发光二极管，使所述有机发光二极管发光具体包括：
    输入低电压电平至所述扫描线，输入高电压电平至所述电源线，使所述补偿控制电压为低电压电平，以关断所述第一晶体管和第三晶体管，导通所述第二晶体管、第四晶体管和有机发光二极管，使所述有机发光二极管发光。
  10. 一种显示面板，包括权利要求1~2中任一项所述的像素驱动电路。
  11. 根据权利要求10所述的显示面板，其中所述像素驱动电路形成于阵列基板上，所述阵列基板上设置有多条数据线和栅极线，所述多条数据线和栅极线限定了多个所述像素驱动电路；所述阵列基板还包括驱动芯片，用于为所述数据线、栅极线和补偿控制电压提供时序信号，为所述电源线提供电源信号。
  12. 根据权利要求10所述的显示面板，其中所述显示面板为主动矩阵式有机发光二极管显示面板。
  13. 根据权利要求10所述的显示面板，其中所述显示面板的亮度由流过所述有机发光二极管的电流决定。
  14. 根据权利要求10所述的显示面板，其中当所述第一晶体管关断、所述第三晶体管导通、及所述第四晶体管关断时，所述第二晶体管的阀值电压被补偿；当所述第一晶体管导通、所述第三晶体管关断、及所述第四晶体管导通时，所述第一电容被充电。
  15. 根据权利要求10所述的显示面板，其中当所述第一晶体管和第三晶体管关断，所述第二晶体管、第四晶体管和有机发光二极管导通时，所述有机发光二极管发光。
PCT/CN2014/077380 2014-05-09 2014-05-13 一种像素驱动电路及其驱动方法、显示面板 Ceased WO2015168954A1 (zh)

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