WO2017161650A1 - 感测amoled像素驱动特性的系统及amoled显示装置 - Google Patents

感测amoled像素驱动特性的系统及amoled显示装置 Download PDF

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Publication number
WO2017161650A1
WO2017161650A1 PCT/CN2016/081937 CN2016081937W WO2017161650A1 WO 2017161650 A1 WO2017161650 A1 WO 2017161650A1 CN 2016081937 W CN2016081937 W CN 2016081937W WO 2017161650 A1 WO2017161650 A1 WO 2017161650A1
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Prior art keywords
voltage
sensing
emitting diode
organic light
light emitting
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English (en)
French (fr)
Inventor
付舰航
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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 US15/106,833 priority Critical patent/US10297181B2/en
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    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/006—Electronic inspection or testing of displays and display drivers, e.g. of LED or LCD displays
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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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    • G09G3/00—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
    • G09G3/3291—Details of drivers for data electrodes in which the data driver supplies a variable data voltage for setting the current through, or the voltage across, the light-emitting elements
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Definitions

  • the present invention relates to the field of display technologies, and in particular, to a system for sensing AMOLED pixel driving characteristics and an AMOLED display device.
  • OLED Organic Light Emitting Display
  • OLED Organic Light Emitting Display
  • the OLED display device can be divided into two types: passive matrix OLED (PMOLED) and active matrix OLED (AMOLED), namely direct addressing and thin film transistor (Thin Film Transistor, according to the driving method). TFT) matrix addressing two types.
  • the AMOLED has pixels arranged in an array, belongs to an active display type, has high luminous efficiency, and is generally used as a high-definition large-sized display device.
  • the AMOLED is a current driving device. When a current flows through the organic light emitting diode, the organic light emitting diode emits light, and the luminance of the light is determined by the current flowing through the organic light emitting diode itself.
  • the driving circuit of each pixel in the conventional AMOLED display device is usually a 2T1C structure, that is, a structure in which two thin film transistors are added with one capacitor.
  • the scan signal Scan controls the switching thin film transistor ST to be turned on
  • the data signal Data is transmitted to the gate of the driving thin film transistor T1
  • the capacitor C is charged
  • the driving thin film transistor DT is turned on to drive the thin film.
  • the source of the transistor DT is connected to the anode of the organic light emitting diode OLED, and the current flows from the driving thin film transistor DT into the organic light emitting diode OLED to emit light. Under the action of the capacitor C, the potential of the gate of the driving thin film transistor DT is maintained until the next frame. Switch.
  • the driving characteristics of the AMOLED pixels must be identical to each other at all positions of the display panel.
  • the actual situation is that the driving characteristics of the respective AMOLED pixels are not completely the same due to various reasons such as process variation, usage environment change, and aging, which may result in the same
  • the data signal is input into the AMOLED pixel, the brightness of the organic light emitting diode OLED is different, which affects the display effect. Therefore, it is necessary to sense the driving characteristics of the AMOLED pixel and compensate the data signal accordingly.
  • ADC analog to digital converter
  • the anode voltage of the OLED OLED will rise, possibly exceeding the input voltage range of the analog-to-digital converter, resulting in failure
  • the anode voltage of the organic light emitting diode is accurately sensed, which affects the compensation effect on the data signal.
  • An object of the present invention is to provide a system for sensing the driving characteristics of an AMOLED pixel, which can accurately measure the anode voltage of the organic light emitting diode within the sensing range of the input analog-to-digital converter, and ensure the driving characteristic of the AMOLED pixel.
  • the accuracy of the measurement ensures the compensation effect on the data signal and improves the image quality of the AMOLED display device.
  • Another object of the present invention is to provide an AMOLED display device that accurately senses the driving characteristics of the AMOLED pixel, can ensure the compensation effect on the data signal, and improve the image quality.
  • the present invention firstly provides a system for sensing the driving characteristics of an AMOLED pixel, comprising: an AMOLED display panel having an array of AMOLED pixels arranged in an array, the working process of the AMOLED display panel being divided into a driving stage and a sense During the measurement phase, each AMOLED pixel has a pixel driving circuit, and the pixel driving circuit is configured to receive the compensated data signal to drive the organic light emitting diode in the driving phase during the driving phase;
  • a sensing module electrically connected to the pixel driving circuit during a sensing phase, configured to sense an anode voltage of the organic light emitting diode
  • a data compensation module electrically connected to the sensing module, configured to compensate the original data signal according to the sensing result output by the sensing module;
  • a digital-to-analog converter electrically connected to the data compensation module and the pixel driving circuit, configured to perform digital-to-analog conversion and transmit the compensated data signal output by the data compensation module to the pixel driving circuit;
  • the sensing module comprises: a switch, a variable negative voltage source, a voltage adding circuit, an analog-to-digital converter, and an offset compensation unit; one end of the switch is connected to an anode of the organic light emitting diode in the pixel driving circuit, and the other end is connected to the voltage a first input end of the adding circuit; one end of the variable negative voltage source is grounded, and the other end is connected to a second input end of the voltage adding circuit; an output end of the voltage adding circuit is connected to an input end of the analog to digital converter; The other input end of the analog-to-digital converter is connected to a constant reference voltage, and the output end is connected to the input end of the offset compensation unit; The output end outputs a sensing result of the anode voltage of the organic light emitting diode to the data compensation module;
  • variable negative voltage source adjusts a voltage value outputted to the voltage adding circuit according to a change in an anode voltage of the organic light emitting diode; the variable negative voltage source and the voltage adding circuit cooperate to adjust an input voltage of the analog to digital converter, This input voltage is always within the sensing range of the analog to digital converter.
  • the offset compensation unit obtains an anode voltage of the organic light emitting diode by adding a digital quantity corresponding to an output value of the analog to digital converter and an absolute value of a voltage value output by the variable negative voltage source.
  • the pixel driving circuit comprises: a switching thin film transistor, a driving thin film transistor, a capacitor, and an organic light emitting diode; the gate of the switching thin film transistor is connected to the scan signal, the source is connected to the compensated data signal, and the drain is electrically connected to the drain Driving the gate of the thin film transistor; the source of the driving thin film transistor is electrically connected to the anode of the organic light emitting diode, and the drain is connected to the positive power supply voltage; the two ends of the capacitor are electrically connected to the gate and the source of the driving thin film transistor respectively; The cathode of the LED is grounded.
  • the switch is disconnected in a driving phase so that the sensing module does not work, and the pixel driving circuit receives the compensated data signal to drive the organic light emitting diode to emit light;
  • the switch is closed during the sensing phase such that the sensing module senses the anode voltage of the organic light emitting diode.
  • variable negative voltage source in the sensing module outputs different voltage values for different regions of the AMOLED display panel for the pixel driving circuit.
  • the voltage value of the variable negative voltage source output in the sensing module gradually decreases as the use time of the AMOLED display panel increases.
  • the sensing phase is set within a vertical blanking period of the AMOLED display panel.
  • the present invention also provides an AMOLED display device comprising the above-described system for sensing the driving characteristics of an AMOLED pixel.
  • the invention also provides a system for sensing the driving characteristics of an AMOLED pixel, comprising:
  • An AMOLED display panel having arrayed AMOLED pixels the working process of the AMOLED display panel is divided into a driving phase and a sensing phase, each AMOLED pixel has a pixel driving circuit, and the pixel driving circuit is used in a driving phase Receiving the compensated data signal to drive the organic light emitting diode therein to emit light;
  • a sensing module electrically connected to the pixel driving circuit during a sensing phase, configured to sense an anode voltage of the organic light emitting diode
  • a data compensation module electrically connected to the sensing module, configured to output according to the sensing module The sensing result compensates for the original data signal
  • a digital-to-analog converter electrically connected to the data compensation module and the pixel driving circuit, configured to perform digital-to-analog conversion and transmit the compensated data signal output by the data compensation module to the pixel driving circuit;
  • the sensing module comprises: a switch, a variable negative voltage source, a voltage adding circuit, an analog-to-digital converter, and an offset compensation unit; one end of the switch is connected to an anode of the organic light emitting diode in the pixel driving circuit, and the other end is connected to the voltage a first input end of the adding circuit; one end of the variable negative voltage source is grounded, and the other end is connected to a second input end of the voltage adding circuit; an output end of the voltage adding circuit is connected to an input end of the analog to digital converter; The other input end of the analog-to-digital converter is connected to a constant reference voltage, and the output end is connected to the input end of the offset compensation unit; the output end of the offset compensation unit outputs the anode voltage to the organic light emitting diode to the data compensation module Sensing result;
  • variable negative voltage source adjusts a voltage value outputted to the voltage adding circuit according to a change in an anode voltage of the organic light emitting diode; the variable negative voltage source and the voltage adding circuit cooperate to adjust an input voltage of the analog to digital converter, Making the input voltage always within the sensing range of the analog to digital converter;
  • the offset compensation unit obtains an anode voltage of the organic light emitting diode by adding a digital quantity corresponding to an output value of the analog to digital converter and an absolute value of a voltage value output by the variable negative voltage source;
  • the pixel driving circuit comprises: a switching thin film transistor, a driving thin film transistor, a capacitor, and an organic light emitting diode; a gate of the switching thin film transistor is connected to the scan signal, and the source is connected to the compensated data signal, and the drain is electrically Connected to the gate of the driving thin film transistor; the source of the driving thin film transistor is electrically connected to the anode of the organic light emitting diode, and the drain is connected to the positive power supply voltage; the two ends of the capacitor are electrically connected to the gate and the source of the driving thin film transistor respectively The cathode of the organic light emitting diode is grounded.
  • the system for sensing the driving characteristics of an AMOLED pixel and the AMOLED display device provided by the present invention, the anode voltage of the organic light emitting diode in the pixel driving circuit and the output voltage of the variable negative voltage source are connected to the voltage during the sensing phase
  • An adding circuit the voltage adding circuit inputs the addition result to the analog-to-digital converter
  • the variable negative voltage source adjusts the voltage value outputted to the voltage adding circuit according to the change of the anode voltage of the organic light emitting diode, and passes the variable negative voltage
  • the interaction between the source and the voltage adding circuit can adjust the input voltage of the analog-to-digital converter so that the input voltage is always within the sensing range of the analog-to-digital converter, and then the output of the analog-to-digital converter is compensated by the offset compensation unit.
  • the digital quantity corresponding to the absolute value of the voltage value outputted by the negative voltage source is added to obtain the anode voltage of the organic light emitting diode, thereby realizing accurate measurement of the organic light emitting diode.
  • the anode voltage ensures the accuracy of sensing the driving characteristics of the AMOLED pixel, thereby ensuring the compensation effect on the data signal and improving the image quality of the AMOLED display device.
  • FIG. 1 is a circuit diagram of a driving circuit of each pixel in a conventional AMOLED display device
  • FIG. 2 is a structural block diagram of a system for sensing a pixel driving characteristic of an AMOLED according to the present invention
  • FIG. 3 is a display timing waveform diagram of a system for sensing AMOLED pixel driving characteristics shown in FIG. 2 based on Video Electronics Standards Association (VESA);
  • VESA Video Electronics Standards Association
  • FIG. 4 is a schematic diagram of a variable negative voltage source in a system for sensing AMOLED pixel driving characteristics according to an anode voltage change of an organic light emitting diode, such that an output result of the voltage adding circuit is within a sensing range of the analog to digital converter;
  • FIG. 5 is a schematic diagram of a variable negative voltage source outputting different voltage values for different regions of an AMOLED display panel in a system for sensing AMOLED pixel driving characteristics according to the present invention
  • FIG. 6 is a schematic diagram showing the voltage value of the variable negative voltage source output in the system for sensing the pixel driving characteristics of the present invention gradually decreasing as the use time of the AMOLED display panel increases.
  • the present invention first provides a system for sensing the driving characteristics of an AMOLED pixel, including:
  • An AMOLED display panel a sensing module 20, a data compensation module 30, and a digital to analog converter 40 having AMOLED pixels arranged in an array.
  • the working process of the AMOLED display panel is divided into a driving phase and a sensing phase, and each AMOLED pixel has a pixel driving circuit 10.
  • the pixel driving circuit 10 is configured to receive, during the driving phase, the compensated data signal Data to drive the organic light emitting diode OLED to emit light therein.
  • the pixel driving circuit 10 can be selected from, but not limited to, a 2T1C structure, and specifically includes a switching thin film transistor ST, a driving thin film transistor DT, a capacitor C, and an organic light emitting diode OLED.
  • the gate of the switching thin film transistor ST is connected to the scan signal Scan, the source is connected to the compensated data signal Data, and the drain is electrically connected to the gate of the driving thin film transistor DT;
  • the source of the film transistor DT is electrically connected to the anode of the organic light emitting diode OLED, and the drain is connected to the positive power supply voltage VDD;
  • the two ends of the capacitor C are electrically connected to the gate and the source of the driving thin film transistor DT, respectively;
  • the organic light emitting diode OLED The cathode is grounded.
  • the sensing module 20 is electrically connected to the pixel driving circuit 10 during a sensing phase for sensing an anode voltage of the organic light emitting diode OLED, and sensing driving characteristics of the AMOLED pixel based on an anode voltage of the organic light emitting diode OLED.
  • the sensing module 20 includes a switch S, a variable negative voltage source 21, a voltage adding circuit 22, an analog to digital converter 23, and an offset compensation unit 24.
  • One end of the switch S is connected to the anode of the organic light emitting diode OLED in the pixel driving circuit 10, and the other end is connected to the first input end of the voltage adding circuit 22; one end of the variable negative voltage source 21 is grounded, and the other end is connected with a voltage adding circuit.
  • the second input terminal of the voltage adding circuit 22 is connected to one input terminal of the analog-to-digital converter 23; the other input terminal of the analog-to-digital converter 23 is connected to a constant reference voltage Vref, and the output terminal is connected with offset compensation.
  • the input of the unit 24; the output of the offset compensation unit 24 outputs a sensing result to the data compensation module 30 for the anode voltage of the organic light emitting diode OLED.
  • the data compensation module 30 is electrically connected to the output end of the offset compensation unit 24 of the sensing module 20, and simultaneously accesses the original data signal Data for the original data signal according to the sensing result output by the sensing module 20. Make compensation.
  • the digital-to-analog converter 40 is electrically connected to the data compensation module 30 and the pixel driving circuit 10 for digital-to-analog conversion and transmission of the compensated data signal Data outputted by the data compensation module 30 to the pixel driving circuit 10.
  • variable negative voltage source 21 adjusts its voltage value outputted to the voltage adding circuit 22 according to a change in the anode voltage of the organic light emitting diode OLED; the variable negative voltage The source 21 cooperates with the voltage addition circuit 22 to adjust the input voltage of the analog to digital converter 23 such that the input voltage is always within the sensing range of the analog to digital converter 23.
  • the switch S is disconnected in the driving phase so that the sensing module 20 does not work, the pixel driving circuit 10 receives the compensated data signal Data, and drives the organic light emitting diode OLED to emit light; the switch S Closing during the sensing phase causes the sensing module 20 to sense the anode voltage of the organic light emitting diode OLED.
  • the sensing phase is set in a vertical blanking period VB of the AMOLED display panel.
  • the data enable signal is invalid, so there is no image data input during the sensing phase.
  • the switch S is closed, at which time the anode voltage of the organic light emitting diode OLED enters the first input terminal of the voltage adding circuit 22 through the closed switch S, and the voltage is applied.
  • the second input end of the circuit 22 is connected to the voltage value output by the variable negative voltage source 21, and the voltage adding circuit 22 adds the anode voltage of the organic light emitting diode OLED and the voltage value outputted by the variable negative voltage source 21, and transmits the result.
  • the voltage adding circuit 22 To an input terminal of the analog-to-digital converter 23, by adjusting the output voltage value of the variable negative voltage source 21, the voltage of the anode of the organic light-emitting diode OLED and the output of the variable negative voltage source 21 can be ensured by the voltage adding circuit 22.
  • the analog-to-digital converter 23 can sense the voltage in the range of 1 to 3V when the organic light emitting diode OLED The anode voltage is raised to 3.5V, which has exceeded the sensing range of the analog-to-digital converter 23. At this time, if the variable negative voltage source 21 is adjusted to output a voltage of -2V, the voltage adding circuit 22 is applied to the organic light emitting diode OLED.
  • anode voltage of 3.5V is added to the voltage -2V outputted from the variable negative voltage source 21
  • a voltage of 1.5V which is within the sensing range of the analog-to-digital converter 23 is input to the analog-to-digital converter 23, an analog-to-digital converter.
  • the analog-to-digital conversion of the result of 1.5 V is output to the offset compensating unit 24, and the offset compensating unit 24 passes the output of the analog-to-digital converter 23 and the absolute value of the voltage value output from the variable negative voltage source 21. That is, the digital quantity corresponding to 2V is summed to obtain an accurate anode voltage of 3.5V of the organic light emitting diode OLED at this time.
  • variable negative voltage source 21 in the system for sensing the AMOLED pixel driving characteristics of the present invention can be adjusted according to actual needs.
  • the variable negative voltage source 21 outputs different voltage values for the pixel driving circuit 10 in different regions of the AMOLED display panel, that is, when a certain driving area of the pixel driving circuit 10 is organic.
  • the variable negative voltage source 21 in this region outputs a lower negative voltage to ensure that the analog to digital converter 23 operates within its sensing range;
  • the variable negative voltage source 21 in this area outputs a higher negative voltage to ensure that the analog to digital converter 23 is within its sensing range.
  • variable negative voltage source 21 outputs a GND voltage, that is, the voltage value. 0.
  • the anode voltage of a general organic light emitting diode increases as its use time increases, so the voltage value output by the variable negative voltage source 21 follows the AMOLED display panel.
  • the use time is gradually lowered to ensure that the input voltage of the analog-to-digital converter 23 is within its sensing range.
  • the present invention also provides an AMOLED display device including the above-described system for sensing AMOLED pixel driving characteristics as shown in FIG. 2, which accurately senses the driving characteristics of the AMOLED pixel and can ensure compensation for the data signal. The effect is to improve the image quality.
  • the system for sensing the pixel driving characteristics of the AMOLED is not described again here.
  • the system for sensing the driving characteristics of the AMOLED pixel and the AMOLED display device of the present invention connect the anode voltage of the organic light emitting diode and the output voltage of the variable negative voltage source in the pixel driving circuit to the voltage adding circuit in the sensing stage.
  • the voltage adding circuit inputs the addition result into the analog-to-digital converter, and the variable negative voltage source adjusts the voltage value outputted to the voltage adding circuit according to the change of the anode voltage of the organic light emitting diode, and the variable negative voltage source
  • the voltage adding circuit can adjust the input voltage of the analog-to-digital converter so that the input voltage is always within the sensing range of the analog-to-digital converter, and then the output of the analog-to-digital converter and the variable negative are utilized by the offset compensation unit.
  • the digital voltage corresponding to the absolute value of the voltage value outputted by the voltage source is summed to obtain the anode voltage of the organic light emitting diode, thereby accurately measuring the anode voltage of the organic light emitting diode, and ensuring the accuracy of sensing the driving characteristics of the AMOLED pixel. Thereby, the compensation effect on the data signal is ensured, and the image quality of the AMOLED display device is improved.

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Abstract

一种感测AMOLED像素驱动特性的系统及AMOLED显示装置，在感测阶段将像素驱动电路(10)中有机发光二极管的阳极电压与可变负电压源(21)的输出电压接入电压加法电路(22)，电压加法电路(22)将相加结果输入模数转换器(23)，由于所述可变负电压源(21)根据有机发光二极管的阳极电压的变化而调整，通过可变负电压源(21)与电压加法电路(22)的共同作用能够调整模数转换器(23)的输入电压，使得该输入电压始终处于模数转换器(23)的感测范围内，实现了准确测量有机发光二极管的阳极电压，保证了对AMOLED像素驱动特性感测的准确性，从而保证了对数据信号的补偿效果，提升了AMOLED显示装置的图像质量。

Description

感测AMOLED像素驱动特性的系统及AMOLED显示装置 技术领域
本发明涉及显示技术领域，尤其涉及一种感测AMOLED像素驱动特性的系统及AMOLED显示装置。
背景技术
有机发光二极管(Organic Light Emitting Display，OLED)显示装置具有自发光、驱动电压低、发光效率高、响应时间短、清晰度与对比度高、近180°视角、使用温度范围宽，可实现柔性显示与大面积全色显示等诸多优点，被业界公认为是最有发展潜力的显示装置。
OLED显示装置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，AMOLED具有呈阵列式排布的像素，属于主动显示类型，发光效能高，通常用作高清晰度的大尺寸显示装置。
AMOLED是电流驱动器件，当有电流流经有机发光二极管时，有机发光二极管发光，且发光亮度由流经有机发光二极管自身的电流决定。
如图1所示，现有的AMOLED显示装置中各个像素的驱动电路通常为2T1C结构，即两个薄膜晶体管加一个电容的结构。当这种AMOLED像素驱动电路工作时，扫描信号Scan控制开关薄膜晶体管ST导通，数据信号Data传输至驱动薄膜晶体管T1的栅极，并对电容C进行充电，驱动薄膜晶体管DT导通，驱动薄膜晶体管DT的源极连接有机发光二极管OLED的阳极，电流自驱动薄膜晶体管DT流入有机发光二极管OLED使其发光，在电容C的作用下，驱动薄膜晶体管DT的栅极的电位保持至下一帧画面切换。
AMOLED像素的驱动特性必须在显示面板的所有位置处彼此相同，然而实际的情况是由于工艺偏差、使用环境改变、及老化等多种原因，各个AMOLED像素驱动特性都不完全相同，这会导致同样的数据信号输入AMOLED像素时有机发光二极管OLED的亮度不同，影响显示的效果，因此需要对AMOLED像素的驱动特性进行感测并相应对数据信号进行补偿。
用于感测AMOLED像素驱动特性并利用显示面板的外部驱动电路进行补偿以提高显示面板的图像质量和寿命的外部补偿技术已经出现。现有 的外部补偿技术利用模数转换器(Analog to Digital Converter，ADC)基于感测有机发光二级管OLED的阳极电压的改变或驱动薄膜晶体管DT的源极电压的改变来感测AMOLED像素的驱动特性，以对输入的数据信号进行补偿，但随着有机发光二极管OLED的老化或者驱动环境改变等原因，有机发光二极管OLED的阳极电压会升高，可能超过模数转换器的输入电压范围，导致无法准确感测出有机发光二极管的阳极电压，影响对数据信号的补偿效果。
发明内容
本发明的目的在于提供一种感测AMOLED像素驱动特性的系统，能够使得输入模数转换器的电压值在其感测范围内，准确测量有机发光二极管的阳极电压，保证对AMOLED像素驱动特性感测的准确性，从而保证对数据信号的补偿效果，提升AMOLED显示装置的图像质量。
本发明的另一目的在于提供一种AMOLED显示装置，其对AMOLED像素驱动特性的感测准确，能够保证对数据信号的补偿效果，提升图像质量。
为实现上述目的，本发明首先提供一种感测AMOLED像素驱动特性的系统，包括：具有呈阵列式排布的AMOLED像素的AMOLED显示面板，该AMOLED显示面板的工作过程分为驱动阶段、和感测阶段，每一AMOLED像素具有像素驱动电路，所述像素驱动电路用于在驱动阶段接收经补偿过的数据信号驱动其内的有机发光二极管发光；
在感测阶段与所述像素驱动电路电性连接的感测模块，用于感测有机发光二极管的阳极电压；
与所述感测模块电性连接的数据补偿模块，用于根据感测模块输出的感测结果对原始的数据信号进行补偿；
以及电性连接所述数据补偿模块和像素驱动电路的数模转换器，用于将数据补偿模块输出的补偿后的数据信号进行数模转换并传送给像素驱动电路；
所述感测模块包括：开关、可变负电压源、电压加法电路、模数转换器、及偏移补偿单元；所述开关的一端连接像素驱动电路内有机发光二极管的阳极，另一端连接电压加法电路的第一输入端；所述可变负电压源的一端接地，另一端连接电压加法电路的第二输入端；所述电压加法电路的输出端连接模数转换器的一个输入端；所述模数转换器的另一输入端接入一恒定的参考电压，输出端连接偏移补偿单元的输入端；偏移补偿单元的 输出端向所述数据补偿模块输出对有机发光二极管的阳极电压的感测结果；
所述可变负电压源根据有机发光二极管的阳极电压的变化调整其向电压加法电路输出的电压值；所述可变负电压源与电压加法电路共同作用来调整模数转换器的输入电压，使得该输入电压始终处于模数转换器的感测范围内。
所述偏移补偿单元通过对模数转换器的输出结果与可变负电压源输出的电压值的绝对值所对应的数字量做加和得到有机发光二极管的阳极电压。
所述像素驱动电路包括：开关薄膜晶体管、驱动薄膜晶体管、电容、及有机发光二极管；开关薄膜晶体管的栅极接入扫描信号，源极接入经补偿过的数据信号，漏极电性连接于驱动薄膜晶体管的栅极；驱动薄膜晶体管的源极电性连接有机发光二极管的阳极，漏极接入正电源电压；电容的两端分别电性连接于驱动薄膜晶体管的栅极与源极；有机发光二极管的阴极接地。
所述开关在驱动阶段断开使得感测模块不工作，所述像素驱动电路接收经补偿过的数据信号，驱动有机发光二极管发光；
所述开关在感测阶段闭合使得感测模块对有机发光二极管的阳极电压进行感测。
所述感测模块中的可变负电压源针对像素驱动电路处于AMOLED显示面板的不同区域而输出不同的电压值。
所述感测模块中的可变负电压源输出的电压值随着AMOLED显示面板使用时间的增长而逐渐降低。
所述感测阶段设在AMOLED显示面板的垂直消隐周期内。
本发明还提供一种AMOLED显示装置，包括上述的感测AMOLED像素驱动特性的系统。
本发明还提供一种感测AMOLED像素驱动特性的系统，包括：
具有呈阵列式排布的AMOLED像素的AMOLED显示面板，该AMOLED显示面板的工作过程分为驱动阶段、和感测阶段，每一AMOLED像素具有像素驱动电路，所述像素驱动电路用于在驱动阶段接收经补偿过的数据信号驱动其内的有机发光二极管发光；
在感测阶段与所述像素驱动电路电性连接的感测模块，用于感测有机发光二极管的阳极电压；
与所述感测模块电性连接的数据补偿模块，用于根据感测模块输出的 感测结果对原始的数据信号进行补偿；
以及电性连接所述数据补偿模块和像素驱动电路的数模转换器，用于将数据补偿模块输出的补偿后的数据信号进行数模转换并传送给像素驱动电路；
所述感测模块包括：开关、可变负电压源、电压加法电路、模数转换器、及偏移补偿单元；所述开关的一端连接像素驱动电路内有机发光二极管的阳极，另一端连接电压加法电路的第一输入端；所述可变负电压源的一端接地，另一端连接电压加法电路的第二输入端；所述电压加法电路的输出端连接模数转换器的一个输入端；所述模数转换器的另一输入端接入一恒定的参考电压，输出端连接偏移补偿单元的输入端；偏移补偿单元的输出端向所述数据补偿模块输出对有机发光二极管的阳极电压的感测结果；
所述可变负电压源根据有机发光二极管的阳极电压的变化调整其向电压加法电路输出的电压值；所述可变负电压源与电压加法电路共同作用来调整模数转换器的输入电压，使得该输入电压始终处于模数转换器的感测范围内；
其中，所述偏移补偿单元通过对模数转换器的输出结果与可变负电压源输出的电压值的绝对值所对应的数字量做加和得到有机发光二极管的阳极电压；
其中，所述像素驱动电路包括：开关薄膜晶体管、驱动薄膜晶体管、电容、及有机发光二极管；开关薄膜晶体管的栅极接入扫描信号，源极接入经补偿过的数据信号，漏极电性连接于驱动薄膜晶体管的栅极；驱动薄膜晶体管的源极电性连接有机发光二极管的阳极，漏极接入正电源电压；电容的两端分别电性连接于驱动薄膜晶体管的栅极与源极；有机发光二极管的阴极接地。
本发明的有益效果：本发明提供的感测AMOLED像素驱动特性的系统及AMOLED显示装置，在感测阶段将像素驱动电路中有机发光二极管的阳极电压与可变负电压源的输出电压接入电压加法电路，电压加法电路将相加结果输入模数转换器，由于所述可变负电压源根据有机发光二极管的阳极电压的变化而调整其向电压加法电路输出的电压值，通过可变负电压源与电压加法电路的共同作用能够调整模数转换器的输入电压，使得该输入电压始终处于模数转换器的感测范围内，再利用偏移补偿单元对模数转换器的输出结果与可变负电压源输出的电压值的绝对值所对应的数字量做加和即得到有机发光二极管的阳极电压，实现了准确测量有机发光二极管的 阳极电压，保证了对AMOLED像素驱动特性感测的准确性，从而保证了对数据信号的补偿效果，提升AMOLED显示装置的图像质量。
附图说明
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。
附图中，
图1为现有的AMOLED显示装置中各个像素的驱动电路的电路图；
图2为本发明的感测AMOLED像素驱动特性的系统的结构框图；
图3为图2所示的感测AMOLED像素驱动特性的系统基于视频电子标准协会(VESA)的显示时序波形图；
图4为本发明的感测AMOLED像素驱动特性的系统中可变负电压源根据有机发光二极管的阳极电压变化进行调整使得电压加法电路的输出结果在模数转换器感测范围内的示意图；
图5为本发明的感测AMOLED像素驱动特性的系统中可变负电压源针对AMOLED显示面板的不同区域而输出不同的电压值的示意图；
图6为本发明的感测AMOLED像素驱动特性的系统中可变负电压源输出的电压值随着AMOLED显示面板使用时间的增长而逐渐降低的示意图。
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，本发明首先提供一种感测AMOLED像素驱动特性的系统，包括：
具有呈阵列式排布的AMOLED像素的AMOLED显示面板、感测模块20、数据补偿模块30、及数模转换器40。
其中，所述AMOLED显示面板的工作过程分为驱动阶段、和感测阶段，每一AMOLED像素具有像素驱动电路10。所述像素驱动电路10用于在驱动阶段接收经补偿过的数据信号Data驱动其内的有机发光二极管OLED发光。所述像素驱动电路10可选择但不限于为2T1C结构，具体包括：开关薄膜晶体管ST、驱动薄膜晶体管DT、电容C、及有机发光二极管OLED。开关薄膜晶体管ST的栅极接入扫描信号Scan，源极接入经补偿过的数据信号Data，漏极电性连接于驱动薄膜晶体管DT的栅极；驱动薄 膜晶体管DT的源极电性连接有机发光二极管OLED的阳极，漏极接入正电源电压VDD；电容C的两端分别电性连接于驱动薄膜晶体管DT的栅极与源极；有机发光二极管OLED的阴极接地。
所述感测模块20在感测阶段与所述像素驱动电路10电性连接，用于感测有机发光二极管OLED的阳极电压，基于有机发光二极管OLED的阳极电压来感测AMOLED像素的驱动特性。具体地，所述感测模块20包括：开关S、可变负电压源21、电压加法电路22、模数转换器23、及偏移补偿单元24。所述开关S的一端连接像素驱动电路10内有机发光二极管OLED的阳极，另一端连接电压加法电路22的第一输入端；所述可变负电压源21的一端接地，另一端连接电压加法电路22的第二输入端；电压加法电路22的输出端连接模数转换器23的一个输入端；模数转换器23的另一输入端接入一恒定的参考电压Vref，输出端连接偏移补偿单元24的输入端；偏移补偿单元24的输出端向所述数据补偿模块30输出对有机发光二极管OLED的阳极电压的感测结果。
数据补偿模块30电性连接所述感测模块20中偏移补偿单元24的输出端，同时接入原始的数据信号Data，用于根据感测模块20输出的感测结果对原始的数据信号Data进行补偿。
数模转换器40电性连接数据补偿模块30和像素驱动电路10，用于将数据补偿模块30输出的补偿后的数据信号Data进行数模转换并传送给像素驱动电路10。
在本发明的感测AMOLED像素驱动特性的系统中，所述可变负电压源21根据有机发光二极管OLED的阳极电压的变化调整其向电压加法电路22输出的电压值；所述可变负电压源21与电压加法电路22共同作用来调整模数转换器23的输入电压，使得该输入电压始终处于模数转换器23的感测范围内。
结合图3与图2，所述开关S在驱动阶段断开使得感测模块20不工作，所述像素驱动电路10接收经补偿过的数据信号Data，驱动有机发光二极管OLED发光；所述开关S在感测阶段闭合使得感测模块20对有机发光二极管OLED的阳极电压进行感测。
具体地，所述感测阶段设在AMOLED显示面板的垂直消隐周期VB内。在该垂直消隐周期VB内，数据使能信号无效，所以在感测阶段无图像数据输入。
进一步地，在感测阶段，开关S闭合，这时有机发光二极管OLED的阳极电压会通过闭合的开关S进入电压加法电路22的第一输入端，电压加 法电路22的第二输入端接入可变负电压源21输出的电压值，电压加法电路22将有机发光二极管OLED的阳极电压与可变负电压源21输出的电压值相加后将结果传送到模数转换器23的一个输入端，此时通过调整可变负电压源21的输出电压值，能够确保电压加法电路22对有机发光二极管OLED的阳极电压与可变负电压源21输出的电压值的相加结果即模数转换器23的输入电压始终处于模数转换器23的感测范围内，模数转换器23同时接收电压加法电路22的输出电压以及所述恒定的参考电压Vref，经模数转换后输出结果至偏移补偿单元24，所述偏移补偿单元24通过对模数转换器23的输出结果与可变负电压源21输出的电压值的绝对值所对应的数字量做加和得到有机发光二极管OLED的阳极电压。例如，如图4所示，设模数转换器23的感测范围为2V，恒定的参考电压为1V，则模数转换器23可以感测1～3V范围内的电压，当有机发光二极管OLED的阳极电压升高至3.5V，已经超出了模数转换器23的感测范围，此时若调整可变负电压源21输出-2V的电压，那么经电压加法电路22对有机发光二极管OLED的阳极电压3.5V与可变负电压源21输出的电压-2V进行相加后，将处于模数转换器23的感测范围之内的1.5V的电压输入模数转换器23，模数转换器23将1.5V的结果经模数转换后输出至偏移补偿单元24，所述偏移补偿单元24通过对模数转换器23的输出结果与可变负电压源21输出的电压值的绝对值即2V所对应的数字量做加和即得到此时有机发光二极管OLED的准确的阳极电压3.5V。
值得一提的是，本发明的感测AMOLED像素驱动特性的系统中可变负电压源21的输出电压值可以根据实际需要进行调整。
具体地，请参阅图5，所述可变负电压源21针对像素驱动电路10处于AMOLED显示面板的不同区域而输出不同的电压值，即当像素驱动电路10所处的某一显示区域内有机发光二极管OLED的阳极电压提升值较高时，此区域内的可变负电压源21输出较低的负电压，以保证模数转换器23在其感测范围内工作；当像素驱动电路10所处的某一显示区域的有机发光二极管OLED的阳极电压提升值较低时，此区域内的可变负电压源21输出较高的负电压，以保证模数转换器23在其感测范围内工作；如果像素驱动电路10所处的某一显示区域的有机发光二极管OLED的阳极电压本身没有超过模数转换器23的感测范围，则可变负电压源21输出GND电压，即电压值为0。
请参阅图6，一般的有机发光二极管的阳极电压都会随着其使用时间的增加而升高，因此可变负电压源21输出的电压值随着AMOLED显示面板 使用时间的增长而逐渐降低，以此保证模数转换器23的输入电压在其感测范围内。
基于同一发明构思，本发明还提供一种包括上述如图2所示的感测AMOLED像素驱动特性的系统的AMOLED显示装置，其对AMOLED像素驱动特性的感测准确，能够保证对数据信号的补偿效果，提升图像质量。此处不再对感测AMOLED像素驱动特性的系统，进行重复描述。
综上所述，本发明的感测AMOLED像素驱动特性的系统及AMOLED显示装置，在感测阶段将像素驱动电路中有机发光二极管的阳极电压与可变负电压源的输出电压接入电压加法电路，电压加法电路将相加结果输入模数转换器，由于所述可变负电压源根据有机发光二极管的阳极电压的变化而调整其向电压加法电路输出的电压值，通过可变负电压源与电压加法电路的共同作用能够调整模数转换器的输入电压，使得该输入电压始终处于模数转换器的感测范围内，再利用偏移补偿单元对模数转换器的输出结果与可变负电压源输出的电压值的绝对值所对应的数字量做加和即得到有机发光二极管的阳极电压，实现了准确测量有机发光二极管的阳极电压，保证了对AMOLED像素驱动特性感测的准确性，从而保证了对数据信号的补偿效果，提升了AMOLED显示装置的图像质量。
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后附的权利要求的保护范围。

Claims (13)

  1. 一种感测AMOLED像素驱动特性的系统，包括：
    具有呈阵列式排布的AMOLED像素的AMOLED显示面板，该AMOLED显示面板的工作过程分为驱动阶段、和感测阶段，每一AMOLED像素具有像素驱动电路，所述像素驱动电路用于在驱动阶段接收经补偿过的数据信号驱动其内的有机发光二极管发光；
    在感测阶段与所述像素驱动电路电性连接的感测模块，用于感测有机发光二极管的阳极电压；
    与所述感测模块电性连接的数据补偿模块，用于根据感测模块输出的感测结果对原始的数据信号进行补偿；
    以及电性连接所述数据补偿模块和像素驱动电路的数模转换器，用于将数据补偿模块输出的补偿后的数据信号进行数模转换并传送给像素驱动电路；
    所述感测模块包括：开关、可变负电压源、电压加法电路、模数转换器、及偏移补偿单元；所述开关的一端连接像素驱动电路内有机发光二极管的阳极，另一端连接电压加法电路的第一输入端；所述可变负电压源的一端接地，另一端连接电压加法电路的第二输入端；所述电压加法电路的输出端连接模数转换器的一个输入端；所述模数转换器的另一输入端接入一恒定的参考电压，输出端连接偏移补偿单元的输入端；偏移补偿单元的输出端向所述数据补偿模块输出对有机发光二极管的阳极电压的感测结果；
    所述可变负电压源根据有机发光二极管的阳极电压的变化调整其向电压加法电路输出的电压值；所述可变负电压源与电压加法电路共同作用来调整模数转换器的输入电压，使得该输入电压始终处于模数转换器的感测范围内。
  2. 如权利要求1所述的感测AMOLED像素驱动特性的系统，其中，所述偏移补偿单元通过对模数转换器的输出结果与可变负电压源输出的电压值的绝对值所对应的数字量做加和得到有机发光二极管的阳极电压。
  3. 如权利要求1所述的感测AMOLED像素驱动特性的系统，其中，所述像素驱动电路包括：开关薄膜晶体管、驱动薄膜晶体管、电容、及有机发光二极管；开关薄膜晶体管的栅极接入扫描信号，源极接入经补偿过的数据信号，漏极电性连接于驱动薄膜晶体管的栅极；驱动薄膜晶体管的 源极电性连接有机发光二极管的阳极，漏极接入正电源电压；电容的两端分别电性连接于驱动薄膜晶体管的栅极与源极；有机发光二极管的阴极接地。
  4. 如权利要求1所述的感测AMOLED像素驱动特性的系统，其中，所述开关在驱动阶段断开使得感测模块不工作，所述像素驱动电路接收经补偿过的数据信号，驱动有机发光二极管发光；
    所述开关在感测阶段闭合使得感测模块对有机发光二极管的阳极电压进行感测。
  5. 如权利要求4所述的感测AMOLED像素驱动特性的系统，其中，所述感测模块中的可变负电压源针对像素驱动电路处于AMOLED显示面板的不同区域而输出不同的电压值。
  6. 如权利要求4所述的感测AMOLED像素驱动特性的系统，其中，所述感测模块中的可变负电压源输出的电压值随着AMOLED显示面板使用时间的增长而逐渐降低。
  7. 如权利要求4所述的感测AMOLED像素驱动特性的系统，其中，所述感测阶段设在AMOLED显示面板的垂直消隐周期内。
  8. 一种AMOLED显示装置，包括如权利要求1所述的感测AMOLED像素驱动特性的系统。
  9. 一种感测AMOLED像素驱动特性的系统，包括：
    具有呈阵列式排布的AMOLED像素的AMOLED显示面板，该AMOLED显示面板的工作过程分为驱动阶段、和感测阶段，每一AMOLED像素具有像素驱动电路，所述像素驱动电路用于在驱动阶段接收经补偿过的数据信号驱动其内的有机发光二极管发光；
    在感测阶段与所述像素驱动电路电性连接的感测模块，用于感测有机发光二极管的阳极电压；
    与所述感测模块电性连接的数据补偿模块，用于根据感测模块输出的感测结果对原始的数据信号进行补偿；
    以及电性连接所述数据补偿模块和像素驱动电路的数模转换器，用于将数据补偿模块输出的补偿后的数据信号进行数模转换并传送给像素驱动电路；
    所述感测模块包括：开关、可变负电压源、电压加法电路、模数转换器、及偏移补偿单元；所述开关的一端连接像素驱动电路内有机发光二极管的阳极，另一端连接电压加法电路的第一输入端；所述可变负电压源的一端接地，另一端连接电压加法电路的第二输入端；所述电压加法电路的 输出端连接模数转换器的一个输入端；所述模数转换器的另一输入端接入一恒定的参考电压，输出端连接偏移补偿单元的输入端；偏移补偿单元的输出端向所述数据补偿模块输出对有机发光二极管的阳极电压的感测结果；
    所述可变负电压源根据有机发光二极管的阳极电压的变化调整其向电压加法电路输出的电压值；所述可变负电压源与电压加法电路共同作用来调整模数转换器的输入电压，使得该输入电压始终处于模数转换器的感测范围内；
    其中，所述偏移补偿单元通过对模数转换器的输出结果与可变负电压源输出的电压值的绝对值所对应的数字量做加和得到有机发光二极管的阳极电压；
    其中，所述像素驱动电路包括：开关薄膜晶体管、驱动薄膜晶体管、电容、及有机发光二极管；开关薄膜晶体管的栅极接入扫描信号，源极接入经补偿过的数据信号，漏极电性连接于驱动薄膜晶体管的栅极；驱动薄膜晶体管的源极电性连接有机发光二极管的阳极，漏极接入正电源电压；电容的两端分别电性连接于驱动薄膜晶体管的栅极与源极；有机发光二极管的阴极接地。
  10. 如权利要求9所述的感测AMOLED像素驱动特性的系统，其中，所述开关在驱动阶段断开使得感测模块不工作，所述像素驱动电路接收经补偿过的数据信号，驱动有机发光二极管发光；
    所述开关在感测阶段闭合使得感测模块对有机发光二极管的阳极电压进行感测。
  11. 如权利要求10所述的感测AMOLED像素驱动特性的系统，其中，所述感测模块中的可变负电压源针对像素驱动电路处于AMOLED显示面板的不同区域而输出不同的电压值。
  12. 如权利要求10所述的感测AMOLED像素驱动特性的系统，其中，所述感测模块中的可变负电压源输出的电压值随着AMOLED显示面板使用时间的增长而逐渐降低。
  13. 如权利要求10所述的感测AMOLED像素驱动特性的系统，其中，所述感测阶段设在AMOLED显示面板的垂直消隐周期内。
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