WO2016101394A1 - Amoled像素电路 - Google Patents

Amoled像素电路 Download PDF

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Publication number
WO2016101394A1
WO2016101394A1 PCT/CN2015/072549 CN2015072549W WO2016101394A1 WO 2016101394 A1 WO2016101394 A1 WO 2016101394A1 CN 2015072549 W CN2015072549 W CN 2015072549W WO 2016101394 A1 WO2016101394 A1 WO 2016101394A1
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WIPO (PCT)
Prior art keywords
thin film
film transistor
electrically connected
signal voltage
circuit
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PCT/CN2015/072549
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English (en)
French (fr)
Inventor
李文辉
曾志远
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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 US14/424,429 priority Critical patent/US9728125B2/en
Publication of WO2016101394A1 publication Critical patent/WO2016101394A1/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
    • G09G3/3233—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
    • 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]

Definitions

  • the present invention relates to the field of display technologies, and in particular, to an AMOLED pixel circuit.
  • the flat display device has many advantages such as thin body, power saving, no radiation, and has been widely used.
  • the conventional flat display device mainly includes a liquid crystal display (LCD) and an organic light emitting display (OLED).
  • the organic light-emitting diode display device has the advantages of self-illumination, high backlight, high contrast, thin thickness, wide viewing angle, fast response speed, flexible panel, wide temperature range, simple structure and simple process.
  • “Dream Display” it has been favored by major display manufacturers and has become the main force of the third generation of display devices in the display technology field.
  • OLED can be divided into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), namely direct addressing and thin film transistor (TFT).
  • PMOLED passive matrix OLED
  • AMOLED active matrix OLED
  • TFT thin film transistor
  • matrix addressing There are two types of matrix addressing. Among them, PMOLED has high power consumption, which hinders its application in large-size display devices, so PMOLED is generally used as a small-sized display device.
  • AMOLEDs are commonly used as high-definition large-size display devices due to their high luminous efficacy.
  • FIG. 1 is a circuit diagram of a conventional AMOLED pixel circuit.
  • the pixels are arranged in a matrix including a plurality of rows and columns, and each pixel is usually driven by a pixel circuit composed of two thin film transistors and a capacitor (Capacitor), that is, using 2T1C Drive mode.
  • Capacitor Capacitor
  • the gate of the first thin film transistor T1 is electrically connected to the scan line Scan, the source is electrically connected to the signal line Data, the drain is electrically connected to the gate of the second thin film transistor T2, and one end of the capacitor C; the second thin film transistor T2
  • the source is electrically connected to the power line VDD, the drain is electrically connected to the anode of the organic light-emitting diode D; the cathode of the organic light-emitting diode D is electrically connected to the common ground electrode VSS; one end of the capacitor C is electrically connected to the first film
  • the drain of the transistor T1 is electrically connected to the source of the second thin film transistor T2.
  • the scan line Scan controls the first thin film transistor T1 to be turned on, and the signal voltage of the signal line Data passes through the first thin film transistor T1 to enter the gate of the second thin film transistor T2 and the capacitor C, and then the first thin film transistor T1 is closed due to the capacitance.
  • the gate voltage of the second thin film transistor T2 can continue to maintain the signal voltage, so that the second thin film transistor T2 is in an on state, and the driving current corresponding to the signal voltage of the power supply line VDD and the signal voltage enters the organic light emitting through the second thin film transistor T2.
  • Stage tube D driving organic light level Tube D is illuminated.
  • the above-mentioned AMOLED display device belongs to a current drive. Since the lifetime of the organic light-emitting diode D is unstable, its characteristics change with time and temperature, so that the current passing through the organic light-emitting diode D changes, causing a change in the luminance of the light-emitting. Moreover, the situation in which each pixel changes is different, thereby causing display unevenness.
  • An object of the present invention is to provide an AMOLED pixel circuit capable of correcting a driving current entering an organic light emitting diode in each pixel, and solving the problem that the brightness of the organic light emitting diode changes with time and temperature, and the brightness of the light is unstable. And the problem of uneven display.
  • an AMOLED pixel circuit including:
  • a gate of the first thin film transistor is electrically connected to the scan line, a source is electrically connected to the signal line, and a drain is electrically connected to a source of the third thin film transistor and one end of the capacitor;
  • the gate of the third thin film transistor is electrically connected to the control line, the source is electrically connected to the drain of the first thin film transistor, and the drain is electrically connected to the gate of the second thin film transistor;
  • the gate of the second thin film transistor is electrically connected to the drain of the third thin film transistor, the source is electrically connected to the power line, and the drain is electrically connected to the anode of the organic light emitting diode;
  • one end of the capacitor is electrically connected to the drain of the first thin film transistor, and the other end is electrically connected to the source of the second thin film transistor;
  • An organic light emitting diode the anode of the organic light emitting diode is electrically connected to the drain of the second thin film transistor, and the cathode is electrically connected to the common ground electrode;
  • one end of the current measuring circuit is electrically connected to the power line, and the other end is electrically connected to the signal voltage driving circuit;
  • a signal voltage driving circuit one end of the signal voltage driving circuit is electrically connected to the current measuring circuit, and the other end is electrically connected to the signal line.
  • the scan line is used to input a scan signal to control opening and closing of the first thin film transistor.
  • the signal line is used to input a signal voltage to control the magnitude of the drive current entering the organic light emitting diode.
  • the control line is used for inputting a control signal, controlling opening and closing of the third thin film transistor, thereby controlling the AMOLED pixel circuit to perform driving current measurement and signal voltage correction or display.
  • the current measuring circuit is configured to measure the driving current and feed back the measurement result to the signal voltage driving circuit.
  • the signal voltage driving circuit is configured to correct the signal voltage according to the measurement result of the driving current received from the current measuring circuit, and transmit the corrected signal voltage to the signal line.
  • the signal voltage driving circuit When the driving current is smaller than the normal value, the signal voltage driving circuit correspondingly corrects and increases the signal voltage; when the driving current is larger than the normal value, the signal voltage driving circuit correspondingly corrects and reduces the signal voltage.
  • the measurement of the driving current and the correction of the signal voltage by the AMOLED pixel circuit are performed once before or after each frame, or one or more times in each picture display period, or once at the time of turning on, Or once every fixed time interval.
  • the AMOLED pixel circuit measures the drive current line by line and corrects the signal voltage.
  • Each column of pixels corresponds to a current measuring circuit.
  • the invention also provides an AMOLED pixel circuit, comprising:
  • a gate of the first thin film transistor is electrically connected to the scan line, a source is electrically connected to the signal line, and a drain is electrically connected to a source of the third thin film transistor and one end of the capacitor;
  • the gate of the third thin film transistor is electrically connected to a control line, the source is electrically connected to the drain of the first thin film transistor, and the drain is electrically connected to the gate of the second thin film transistor pole;
  • the gate of the second thin film transistor is electrically connected to the drain of the third thin film transistor, the source is electrically connected to the power line, and the drain is electrically connected to the anode of the organic light emitting diode;
  • one end of the capacitor is electrically connected to the drain of the first thin film transistor, and the other end is electrically connected to the source of the second thin film transistor;
  • An organic light emitting diode the anode of the organic light emitting diode is electrically connected to the drain of the second thin film transistor, and the cathode is electrically connected to the common ground electrode;
  • one end of the current measuring circuit is electrically connected to the power line, and the other end is electrically connected to the signal voltage driving circuit;
  • a signal voltage driving circuit one end of the signal voltage driving circuit is electrically connected to the current measuring circuit, and the other end is electrically connected to the signal line;
  • the scan line is used to input a scan signal to control opening and closing of the first thin film transistor
  • the signal line is used for input signal voltage, and controls driving into the organic light emitting diode The magnitude of the moving current
  • the control line is used for inputting a control signal, controlling opening and closing of the third thin film transistor, thereby controlling the AMOLED pixel circuit to perform driving current measurement and signal voltage correction or display;
  • the current measuring circuit is configured to measure the driving current, and feed back the measurement result to the signal voltage driving circuit;
  • the signal voltage driving circuit is configured to correct the signal voltage according to the measurement result of the driving current received from the current measuring circuit, and transmit the corrected signal voltage to the signal line.
  • the present invention provides an AMOLED pixel circuit in which a third thin film transistor is disposed between the first and second thin film transistors, and the third thin film transistor is controlled to be turned on and off by a control line input control signal, thereby Controlling the AMOLED pixel circuit to perform driving current measurement through the current measuring circuit and correcting the signal voltage through the signal voltage driving circuit, or performing normal display, can correct the driving current entering the organic light emitting diode in each pixel, and solve the problem of organic light emission
  • the characteristics of the diode change with time and temperature, the brightness of the light is unstable, and the display is uneven, and the display effect is improved.
  • FIG. 1 is a circuit diagram of a conventional AMOLED pixel circuit
  • FIG. 2 is a circuit diagram of an AMOLED pixel circuit of the present invention.
  • the present invention provides an AMOLED pixel circuit, including:
  • a first thin film transistor T1 a gate of the first thin film transistor T1 is electrically connected to the scan line Scan, a source is electrically connected to the signal line Data, and a drain is electrically connected to a source of the third thin film transistor T3, and One end of the capacitor C;
  • the third thin film transistor T3 has a gate electrically connected to the control line Control, a source electrically connected to the drain of the first thin film transistor T1, and a drain electrically connected to the second thin film transistor T2.
  • the gate of the second thin film transistor T2 is electrically connected to the drain of the third thin film transistor T3, the source is electrically connected to the power line VDD, and the drain is electrically connected to the organic light emitting diode D. anode;
  • capacitor C one end of the capacitor C is electrically connected to the drain of the first thin film transistor T1, and the other end is electrically connected to the source of the second thin film transistor T2;
  • the organic light emitting diode D the anode of the organic light emitting diode D is electrically connected to the drain of the second thin film transistor T2, the cathode is electrically connected to the common ground electrode VSS;
  • the current measuring circuit 1 one end of the current measuring circuit 1 is electrically connected to the power line VDD, the other end is electrically connected to the signal voltage driving circuit 2;
  • a signal voltage driving circuit 2 one end of the signal voltage driving circuit 2 is electrically connected to the current measuring circuit 1, and the other end is electrically connected to the signal line Data.
  • the scan line Scan is used to input a scan signal to control opening and closing of the first thin film transistor T1.
  • the signal line Data is used to input a signal voltage to control the magnitude of the drive current entering the organic light emitting diode D.
  • the control line Control is used to input a control signal, and controls the opening and closing of the third thin film transistor T3, thereby controlling the AMOLED pixel circuit to perform driving current measurement and signal voltage correction or display.
  • the current measuring circuit 1 is used to measure the driving current and feed back the measurement result to the signal voltage driving circuit 2.
  • the signal voltage driving circuit 2 is for correcting the signal voltage based on the measurement result of the driving current received from the current measuring circuit 1, and transmitting the corrected signal voltage to the signal line Data.
  • the working process of the AMOLED pixel circuit of the present invention includes the following stages:
  • the scan line Scan inputs a high potential to the gate of the first thin film transistor T1, controls the first thin film transistor T1 to be turned on, and the control line control inputs a low potential to the gate of the third thin film transistor T3 to control the third thin film transistor.
  • T3 is turned off, and the signal voltage of the signal line Data enters the capacitor C through the first thin film transistor T1.
  • the scan line Scan inputs a low potential to the gate of the first thin film transistor T1, and controls the first thin film transistor T1 to be turned off.
  • control line Control quickly inputs a high potential and a low potential to the gate of the third thin film transistor T3, and controls the third thin film transistor T3 to be turned on and off rapidly; when the third thin film transistor T3 is turned on, the second The thin film transistor T2 is also controlled by the control of the third thin film transistor T3, and the driving current is entered by the power line VDD.
  • the current measuring circuit 1 electrically connected to the power line VDD measures the driving current, and feeds back the measurement result to the signal voltage driving circuit 2; the signal voltage driving circuit 2 according to the amount of current
  • the measurement result of the driving current received by the measuring circuit 1 corrects the signal voltage, and when the equivalent measured driving current is smaller than the normal value, the corresponding correction increases the signal voltage, and the equivalent measured driving current is larger than the normal value.
  • the signal voltage is corrected corresponding to the correction, and the corrected signal voltage is transmitted to the signal line Data by the signal voltage driving circuit 2.
  • the scan line Scan inputs a high potential to the gate of the first thin film transistor T1, controls the first thin film transistor T1 to be turned on, and the control line control inputs a high potential to the gate of the third thin film transistor T3 to control the third thin film transistor.
  • T3 is turned on, the corrected signal voltage enters the gate of the second thin film transistor T2 and the capacitor C from the signal line Data, the second thin film transistor T2 remains open, the driving current enters the organic light emitting diode D from the power line VDD, and the organic light emitting diode D emits light.
  • the signal voltage is corrected, that is, the gate voltage of the second thin film transistor T2 is corrected
  • the driving current entering the organic light emitting diode D through the second thin film transistor T2 is corrected, so that the luminance of the organic light emitting diode D is corrected, and the solution is solved.
  • the display effect is improved by the problem that the luminance of the organic light-emitting diode D changes with time and temperature, and the luminance of the light is unstable and the display is uneven.
  • the entire AMOLED display panel may include a plurality of current measuring circuits 1 each corresponding to one current.
  • the measuring circuit 1 that is, the AMOLED pixel circuits in the same column are electrically connected to one current measuring circuit 1.
  • the first line to the nth (n is a positive integer greater than 1) row scan line Scan sequentially provides scan signals, and the first to nth control lines are sequentially provided.
  • Control provides control signals in sequence, driving current measurement and signal voltage correction line by line.
  • the AMOLED pixel circuit measures the driving current and corrects the signal voltage once before or after each frame, or one or more times in each picture display period, or at the time of power on. Perform once or at regular intervals. Since the drive current measurement and signal voltage correction are performed row by row, the organic light-emitting diode D in each pixel emits light only at the moment of measurement, and does not emit light for the rest of the time. The measurement time is short, and the whole picture gives the human eye a black screen that does not affect the display quality.
  • a third thin film transistor is disposed between the first and second thin film transistors, and the third thin film transistor is controlled to be turned on and off by a control line input control signal, thereby controlling the AMOLED pixel.
  • the circuit performs driving current measurement through the current measuring circuit and performs signal voltage correction through the signal voltage driving circuit, or performs normal display.
  • the driving current entering the organic light-emitting diode in each pixel can be corrected, and the problem that the brightness of the organic light-emitting diode changes with time and temperature is unstable, and display unevenness is solved, and the display effect is improved.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Electroluminescent Light Sources (AREA)
  • Control Of El Displays (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)

Abstract

一种AMOLED像素电路，在第一、第二薄膜晶体管（T1、T2）之间设置第三薄膜晶体管（T3），通过控制线（Control）输入控制信号来控制第三薄膜晶体管（T3）的打开与关闭，从而控制该AMOLED像素电路通过电流量测电路（1）进行驱动电流量测及通过信号电压驱动电路（2）进行信号电压修正，或进行正常显示，能够修正各个像素内进入有机发光二级管（D）的驱动电流，解决由有机发光二级管（D）的特性随时间及温度发生变化所导致的发光亮度不稳定、及显示不均的问题，改善显示效果。

Description

AMOLED像素电路 技术领域
本发明涉及显示技术领域，尤其涉及一种AMOLED像素电路。
背景技术
平面显示装置具有机身薄、省电、无辐射等众多优点，得到了广泛的应用。现有的平面显示装置主要包括液晶显示装置(Liquid Crystal Display，LCD)及有机发光二极管显示装置(Organic Light Emitting Display，OLED)。
有机发光二极管显示装置由于同时具备自发光，不需背光源、对比度高、厚度薄、视角广、反应速度快、可用于挠曲性面板、使用温度范围广、构造及制程较简单等优异特性，被誉为“梦幻显示器”，得到了各大显示器厂家的青睐，已成为显示技术领域中第三代显示器件的主力军。
OLED按照驱动方式可以分为无源矩阵型OLED(Passive Matrix OLED，PMOLED)和有源矩阵型OLED(Active Matrix OLED，AMOLED)两大类，即直接寻址和薄膜晶体管(Thin Film Transistor，TFT)矩阵寻址两类。其中，PMOLED的功耗较高，阻碍了其在大尺寸显示装置中的应用，所以PMOLED通常用作小尺寸的显示装置。而AMOLED因其高发光效能，通常用作高清晰度的大尺寸显示装置。
图1所示为现有的AMOLED像素电路的电路图。在AMOLED显示装置的显示区域内，像素被设置成包括多行、多列的矩阵状，每一像素通常采用由两个薄膜晶体管与一个电容(Capacitor)组成的像素电路进行驱动，即采用2T1C的驱动方式。第一薄膜晶体管T1的栅极电性连接扫描线Scan，源极电性连接信号线Data，漏极与第二薄膜晶体管T2的栅极、及电容C的一端电性连接；第二薄膜晶体管T2的源极电性连接电源线VDD，漏极电性连接有机发光二级管D的阳极；有机发光二级管D的阴极电性连接公共接地电极VSS；电容C的一端电性连接第一薄膜晶体管T1的漏极，另一端电性连接第二薄膜晶体管T2的源极。显示时，扫描线Scan控制第一薄膜晶体管T1打开，信号线Data的信号电压经过第一薄膜晶体管T1进入到第二薄膜晶体管T2的栅极及电容C，然后第一薄膜晶体管T1闭合，由于电容C作用，第二薄膜晶体管T2的栅极电压仍可继续保持信号电压，使得第二薄膜晶体管T2处于导通状态，电源线VDD与信号电压对应的驱动电流通过第二薄膜晶体管T2进入有机发光二级管D，驱动有机发光二级 管D发光。
上述AMOLED显示装置属于电流驱动，由于有机发光二级管D的寿命不稳定，其特性会随时间及温度发生变化，使得通过该有机发光二级管D的电流发生变化，引起发光亮度发生变化，且各个像素变化的情况不同，从而造成显示不均等问题。
发明内容
本发明的目的在于提供一种AMOLED像素电路，能够修正各个像素内进入有机发光二级管的驱动电流，解决由有机发光二级管的特性随时间及温度发生变化所导致的发光亮度不稳定、及显示不均的问题。
为实现上述目的，本发明提供一种AMOLED像素电路，包括：
第一薄膜晶体管，所述第一薄膜晶体管的栅极电性连接于扫描线，源极电性连接于信号线，漏极电性连接于第三薄膜晶体管的源极、及电容的一端；
第三薄膜晶体管，所述第三薄膜晶体管的栅极电性连接于控制线，源极电性连接于第一薄膜晶体管的漏极，漏极电性连接于第二薄膜晶体管的栅极；
第二薄膜晶体管，所述第二薄膜晶体管的栅极电性连接于第三薄膜晶体管的漏极，源极电性连接于电源线，漏极电性连接于有机发光二极管的阳极；
电容，所述电容的一端电性连接于第一薄膜晶体管的漏极，另一端电性连接于第二薄膜晶体管的源极；
有机发光二极管，所述有机发光二极管的阳极电性连接于第二薄膜晶体管的漏极，阴极电性连接于公共接地电极；
电流量测电路，所述电流量测电路的一端电性连接于电源线，另一端电性连接于信号电压驱动电路；
以及信号电压驱动电路，所述信号电压驱动电路的一端电性连接于电流量测电路，另一端电性连接于信号线。
所述扫描线用于输入扫描信号，控制第一薄膜晶体管的打开与关闭。
所述信号线用于输入信号电压，控制进入有机发光二极管的驱动电流的大小。
所述控制线用于输入控制信号，控制第三薄膜晶体管的打开与关闭，从而控制该AMOLED像素电路进行驱动电流量测及信号电压修正或进行显示。
所述电流量测电路用于量测驱动电流，并将量测结果反馈到信号电压驱动电路。
所述信号电压驱动电路用于根据从电流量测电路接收到的驱动电流的量测结果对信号电压进行修正，并将修正后的信号电压传递到信号线。
所述驱动电流相比正常值偏小时，则信号电压驱动电路对应修正提高信号电压；所述驱动电流相比正常值偏大时，则信号电压驱动电路对应修正降低信号电压。
该AMOLED像素电路对驱动电流的量测及对信号电压的修正在每一帧前或每一帧后进行一次，或在每个画面显示周期内进行一次或多次，或在开机时进行一次，或每隔固定时间间隔进行一次。
所述的AMOLED像素电路逐行对驱动电流进行量测及对信号电压进行修正。
每一列像素对应一个电流量测电路。
本发明还提供一种AMOLED像素电路，包括：
第一薄膜晶体管，所述第一薄膜晶体管的栅极电性连接于扫描线，源极电性连接于信号线，漏极电性连接于第三薄膜晶体管的源极、及电容的一端；
第三薄膜晶体管，所述第三薄膜晶体管的栅极电性连接于控制线(Control)，源极电性连接于第一薄膜晶体管的漏极，漏极电性连接于第二薄膜晶体管的栅极；
第二薄膜晶体管，所述第二薄膜晶体管的栅极电性连接于第三薄膜晶体管的漏极，源极电性连接于电源线，漏极电性连接于有机发光二极管的阳极；
电容，所述电容的一端电性连接于第一薄膜晶体管的漏极，另一端电性连接于第二薄膜晶体管的源极；
有机发光二极管，所述有机发光二极管的阳极电性连接于第二薄膜晶体管的漏极，阴极电性连接于公共接地电极；
电流量测电路，所述电流量测电路的一端电性连接于电源线，另一端电性连接于信号电压驱动电路；
以及信号电压驱动电路，所述信号电压驱动电路的一端电性连接于电流量测电路，另一端电性连接于信号线；
其中，所述扫描线用于输入扫描信号，控制第一薄膜晶体管的打开与关闭；
其中，所述信号线用于输入信号电压，控制进入有机发光二极管的驱 动电流的大小；
其中，所述控制线用于输入控制信号，控制第三薄膜晶体管的打开与关闭，从而控制该AMOLED像素电路进行驱动电流量测及信号电压修正或进行显示；
其中，所述电流量测电路用于量测驱动电流，并将量测结果反馈到信号电压驱动电路；
其中，所述信号电压驱动电路用于根据从电流量测电路接收到的驱动电流的量测结果对信号电压进行修正，并将修正后的信号电压传递到信号线。
本发明的有益效果：本发明提供的一种AMOLED像素电路，在第一、第二薄膜晶体管之间设置第三薄膜晶体管，通过控制线输入控制信号来控制第三薄膜晶体管的打开与关闭，从而控制该AMOLED像素电路通过电流量测电路进行驱动电流量测及通过信号电压驱动电路进行信号电压修正，或进行正常显示，能够修正各个像素内进入有机发光二级管的驱动电流，解决由有机发光二级管的特性随时间及温度发生变化所导致的发光亮度不稳定、及显示不均的问题，改善显示效果。
为了能更进一步了解本发明的特征以及技术内容，请参阅以下有关本发明的详细说明与附图，然而附图仅提供参考与说明用，并非用来对本发明加以限制。
附图说明
下面结合附图，通过对本发明的具体实施方式详细描述，将使本发明的技术方案及其它有益效果显而易见。
附图中，
图1为现有的AMOLED像素电路的电路图；
图2为本发明的AMOLED像素电路的电路图。
具体实施方式
为更进一步阐述本发明所采取的技术手段及其效果，以下结合本发明的优选实施例及其附图进行详细描述。
请参阅图2，本发明提供一种AMOLED像素电路，包括：
第一薄膜晶体管T1，所述第一薄膜晶体管T1的栅极电性连接于扫描线Scan，源极电性连接于信号线Data，漏极电性连接于第三薄膜晶体管T3的源极、及电容C的一端；
第三薄膜晶体管T3，所述第三薄膜晶体管T3的栅极电性连接于控制线Control，源极电性连接于第一薄膜晶体管T1的漏极，漏极电性连接于第二薄膜晶体管T2的栅极；
第二薄膜晶体管T2，所述第二薄膜晶体管T2的栅极电性连接于第三薄膜晶体管T3的漏极，源极电性连接于电源线VDD，漏极电性连接于有机发光二极管D的阳极；
电容C，所述电容C的一端电性连接于第一薄膜晶体管T1的漏极，另一端电性连接于第二薄膜晶体管T2的源极；
有机发光二极管D，所述有机发光二极管D的阳极电性连接于第二薄膜晶体管T2的漏极，阴极电性连接于公共接地电极VSS；
电流量测电路1，所述电流量测电路1的一端电性连接于电源线VDD，另一端电性连接于信号电压驱动电路2；
以及信号电压驱动电路2，所述信号电压驱动电路2的一端电性连接于电流量测电路1，另一端电性连接于信号线Data。
进一步的，所述扫描线Scan用于输入扫描信号，控制第一薄膜晶体管T1的打开与关闭。所述信号线Data用于输入信号电压，控制进入有机发光二极管D的驱动电流的大小。所述控制线Control用于输入控制信号，控制第三薄膜晶体管T3的打开与关闭，从而控制该AMOLED像素电路进行驱动电流量测及信号电压修正或进行显示。所述电流量测电路1用于量测驱动电流，并将量测结果反馈到信号电压驱动电路2。所述信号电压驱动电路2用于根据从电流量测电路1接收到的驱动电流的量测结果对信号电压进行修正，并将修正后的信号电压传递到信号线Data。
具体的，本发明的AMOLED像素电路的工作过程包括如下阶段：
(一)、对驱动电流量测及对信号电压修正阶段
首先，扫描线Scan向第一薄膜晶体管T1的栅极输入高电位，控制第一薄膜晶体管T1打开，同步的，控制线Control向第三薄膜晶体管T3的栅极输入低电位，控制第三薄膜晶体管T3关闭，信号线Data的信号电压通过第一薄膜晶体管T1进入电容C存储，此时，由于第三薄膜晶体管T3不导通，则第二薄膜晶体管T2不导通，有机发光二极管D无电流通过，不发光。接下来，扫描线Scan向第一薄膜晶体管T1的栅极输入低电位，控制第一薄膜晶体管T1关闭。然后，控制线Control快速的先后向第三薄膜晶体管T3的栅极输入高电位、低电位，控制第三薄膜晶体管T3快速的先后打开、关闭；当所述第三薄膜晶体管T3打开时，第二薄膜晶体管T2受第三薄膜晶体管T3的控制也随之打开，驱动电流由电源线VDD进入有机发 光二极管D，与此同时，与电源线VDD电性连接的电流量测电路1对驱动电流进行量测，并将量测结果反馈到信号电压驱动电路2；信号电压驱动电路2根据从电流量测电路1接收到的驱动电流的量测结果对信号电压进行修正，当量测到驱动电流相比正常值偏小时，则对应修正提高信号电压，当量测到驱动电流相比正常值偏大时，则对应修正降低信号电压，修正后的的信号电压再由信号电压驱动电路2传递到信号线Data。
(二)、显示阶段
随后，扫描线Scan向第一薄膜晶体管T1的栅极输入高电位，控制第一薄膜晶体管T1打开，同步的，控制线Control向第三薄膜晶体管T3的栅极输入高电位，控制第三薄膜晶体管T3打开，修正后的信号电压由信号线Data进入第二薄膜晶体管T2的栅极和电容C，第二薄膜晶体管T2保持打开，驱动电流由电源线VDD进入有机发光二极管D，有机发光二极管D发光。由于信号电压经过修正，即第二薄膜晶体管T2的栅极电压经过修正，使得通过第二薄膜晶体管T2进入有机发光二极管D的驱动电流得到修正，从而有机发光二极管D的发光亮度得到修正，解决了由有机发光二级管D的特性随时间及温度发生变化所导致的发光亮度不稳定、及显示不均的问题，改善了显示效果。
值得一提的是，对于整个AMOLED显示面板而言，多个像素被设置成包括多行、多列的矩阵状，整个AMOLED显示面板可以包括多个电流量测电路1，每一列像素对应一个电流量测电路1，即位于同一列的AMOLED像素电路共同电性连接于一个电流量测电路1。对整个AMOLED显示面板进行驱动电流量测及信号电压修正时，第一行到第n(n为大于1的正整数)行扫描线Scan依序提供扫描信号，第一行到第n行控制线Control依序提供控制信号，逐行进行驱动电流量测及信号电压修正。进一步的，该AMOLED像素电路对驱动电流的量测及对信号电压的修正在每一帧前或每一帧后进行一次，或在每个画面显示周期内进行一次或多次，或在开机时进行一次，或每隔固定时间间隔进行一次，由于进行驱动电流量测及信号电压修正是逐行进行，各个像素内的有机发光二极管D仅在量测的瞬间发光，其余时间不发光，且量测时间较短，整个画面给人眼的感觉是黑画面，不影响显示质量。
综上所述，本发明的AMOLED像素电路，在第一、第二薄膜晶体管之间设置第三薄膜晶体管，通过控制线输入控制信号来控制第三薄膜晶体管的打开与关闭，从而控制该AMOLED像素电路通过电流量测电路进行驱动电流量测及通过信号电压驱动电路进行信号电压修正，或进行正常显示， 能够修正各个像素内进入有机发光二级管的驱动电流，解决由有机发光二级管的特性随时间及温度发生变化所导致的发光亮度不稳定、及显示不均的问题，改善显示效果。
以上所述，对于本领域的普通技术人员来说，可以根据本发明的技术方案和技术构思作出其他各种相应的改变和变形，而所有这些改变和变形都应属于本发明权利要求的保护范围。

Claims (15)

  1. 一种AMOLED像素电路，包括：
    第一薄膜晶体管，所述第一薄膜晶体管的栅极电性连接于扫描线，源极电性连接于信号线，漏极电性连接于第三薄膜晶体管的源极、及电容的一端；
    第三薄膜晶体管，所述第三薄膜晶体管的栅极电性连接于控制线(Control)，源极电性连接于第一薄膜晶体管的漏极，漏极电性连接于第二薄膜晶体管的栅极；
    第二薄膜晶体管，所述第二薄膜晶体管的栅极电性连接于第三薄膜晶体管的漏极，源极电性连接于电源线，漏极电性连接于有机发光二极管的阳极；
    电容，所述电容的一端电性连接于第一薄膜晶体管的漏极，另一端电性连接于第二薄膜晶体管的源极；
    有机发光二极管，所述有机发光二极管的阳极电性连接于第二薄膜晶体管的漏极，阴极电性连接于公共接地电极；
    电流量测电路，所述电流量测电路的一端电性连接于电源线，另一端电性连接于信号电压驱动电路；
    以及信号电压驱动电路，所述信号电压驱动电路的一端电性连接于电流量测电路，另一端电性连接于信号线。
  2. 如权利要求1所述的AMOLED像素电路，其中，所述扫描线用于输入扫描信号，控制第一薄膜晶体管的打开与关闭。
  3. 如权利要求1所述的AMOLED像素电路，其中，所述信号线用于输入信号电压，控制进入有机发光二极管的驱动电流的大小。
  4. 如权利要求1所述AMOLED像素电路，其中，所述控制线用于输入控制信号，控制第三薄膜晶体管的打开与关闭，从而控制该AMOLED像素电路进行驱动电流量测及信号电压修正或进行显示。
  5. 如权利要求1所述AMOLED像素电路，其中，所述电流量测电路用于量测驱动电流，并将量测结果反馈到信号电压驱动电路。
  6. 如权利要求1所述AMOLED像素电路，其中，所述信号电压驱动电路用于根据从电流量测电路接收到的驱动电流的量测结果对信号电压进行修正，并将修正后的信号电压传递到信号线。
  7. 如权利要求6所述的AMOLED像素电路，其中，所述驱动电流相 比正常值偏小时，则信号电压驱动电路对应修正提高信号电压；所述驱动电流相比正常值偏大时，则信号电压驱动电路对应修正降低信号电压。
  8. 如权利要求7所述的AMOLED像素电路，其中，该AMOLED像素电路对驱动电流的量测及对信号电压的修正在每一帧前或每一帧后进行一次，或在每个画面显示周期内进行一次或多次，或在开机时进行一次，或每隔固定时间间隔进行一次。
  9. 如权利要求8所述的AMOLED像素电路，其中，所述AMOLED像素电路逐行对驱动电流进行量测及对信号电压进行修正。
  10. 如权利要求1所述的AMOLED像素电路，其中，每一列像素对应一个电流量测电路。
  11. 一种AMOLED像素电路，包括：
    第一薄膜晶体管，所述第一薄膜晶体管的栅极电性连接于扫描线，源极电性连接于信号线，漏极电性连接于第三薄膜晶体管的源极、及电容的一端；
    第三薄膜晶体管，所述第三薄膜晶体管的栅极电性连接于控制线(Control)，源极电性连接于第一薄膜晶体管的漏极，漏极电性连接于第二薄膜晶体管的栅极；
    第二薄膜晶体管，所述第二薄膜晶体管的栅极电性连接于第三薄膜晶体管的漏极，源极电性连接于电源线，漏极电性连接于有机发光二极管的阳极；
    电容，所述电容的一端电性连接于第一薄膜晶体管的漏极，另一端电性连接于第二薄膜晶体管的源极；
    有机发光二极管，所述有机发光二极管的阳极电性连接于第二薄膜晶体管的漏极，阴极电性连接于公共接地电极；
    电流量测电路，所述电流量测电路的一端电性连接于电源线，另一端电性连接于信号电压驱动电路；
    以及信号电压驱动电路，所述信号电压驱动电路的一端电性连接于电流量测电路，另一端电性连接于信号线；
    其中，所述扫描线用于输入扫描信号，控制第一薄膜晶体管的打开与关闭；
    其中，所述信号线用于输入信号电压，控制进入有机发光二极管的驱动电流的大小；
    其中，所述控制线用于输入控制信号，控制第三薄膜晶体管的打开与关闭，从而控制该AMOLED像素电路进行驱动电流量测及信号电压修正或 进行显示；
    其中，所述电流量测电路用于量测驱动电流，并将量测结果反馈到信号电压驱动电路；
    其中，所述信号电压驱动电路用于根据从电流量测电路接收到的驱动电流的量测结果对信号电压进行修正，并将修正后的信号电压传递到信号线。
  12. 如权利要求11所述的AMOLED像素电路，其中，所述驱动电流相比正常值偏小时，则信号电压驱动电路对应修正提高信号电压；所述驱动电流相比正常值偏大时，则信号电压驱动电路对应修正降低信号电压。
  13. 如权利要求11所述的AMOLED像素电路，其中，该AMOLED像素电路对驱动电流的量测及对信号电压的修正在每一帧前或每一帧后进行一次，或在每个画面显示周期内进行一次或多次，或在开机时进行一次，或每隔固定时间间隔进行一次。
  14. 如权利要求11所述的AMOLED像素电路，其中，所述AMOLED像素电路逐行对驱动电流进行量测及对信号电压进行修正。
  15. 如权利要求11所述的AMOLED像素电路，其中，每一列像素对应一个电流量测电路。
PCT/CN2015/072549 2014-12-22 2015-02-09 Amoled像素电路 Ceased WO2016101394A1 (zh)

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