WO2016115752A1 - 一种有机发光显示面板及其压降补偿方法 - Google Patents

一种有机发光显示面板及其压降补偿方法 Download PDF

Info

Publication number
WO2016115752A1
WO2016115752A1 PCT/CN2015/071842 CN2015071842W WO2016115752A1 WO 2016115752 A1 WO2016115752 A1 WO 2016115752A1 CN 2015071842 W CN2015071842 W CN 2015071842W WO 2016115752 A1 WO2016115752 A1 WO 2016115752A1
Authority
WO
WIPO (PCT)
Prior art keywords
voltage
data
pixel unit
power supply
unit
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/CN2015/071842
Other languages
English (en)
French (fr)
Inventor
郭平昇
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TCL China Star Optoelectronics Technology Co Ltd
Original Assignee
Shenzhen China Star Optoelectronics Technology Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US14/778,104 priority Critical patent/US9812064B2/en
Publication of WO2016115752A1 publication Critical patent/WO2016115752A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Images

Classifications

    • 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]
    • 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
    • G09G3/3283—Details of drivers for data electrodes in which the data driver supplies a variable data current for setting the current through, or the voltage across, the light-emitting elements
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0223—Compensation for problems related to R-C delay and attenuation in electrodes of matrix panels, e.g. in gate electrodes or on-substrate video signal electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0233—Improving the luminance or brightness uniformity across the screen
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2360/00—Aspects of the architecture of display systems
    • G09G2360/16—Calculation or use of calculated indices related to luminance levels in display data

Definitions

  • the present invention relates to display panel technology, and more particularly to an organic light emitting display panel and a voltage drop compensation method thereof.
  • organic light-emitting display panels have become the most popular products on the market after thin film transistor liquid crystal display panels due to their advantages of ultra-thin, self-luminous, low power consumption, high efficiency, high contrast and fast response.
  • an organic light emitting display panel outputs a picture in a progressive scan manner. That is, the switching transistor (labeled T1 in the figure) in the pixel cell is turned on row by row by transmitting a scan signal such that the driving transistor (labeled T2 in the figure) in the pixel cell receives the data voltage characterizing the image information. Under the joint action of the data voltage and the power supply voltage, the driving transistor is turned on to generate a corresponding driving current, and is supplied to the organic light emitting diode (labeled as OLED) to drive the organic light emitting diode to emit light.
  • OLED organic light emitting diode
  • the luminance of the organic light-emitting diode depends on the magnitude of the current I OLED flowing therethrough, and the current I OLED is equal to the drain-source current I ds (also called the drive current) of the driving transistor T2.
  • the driving current I ds is determined by the following equation:
  • I ds K ⁇ (V gs -V th ) 2
  • K is the drive transistor electrical parameter
  • V gs is the drive transistor gate-to-source voltage
  • V th is the threshold voltage of the drive transistor
  • OV dd is the supply voltage
  • V data is the data voltage
  • the magnitude of the drive current is closely related to the power supply voltage and the data voltage, as well as the electrical parameters of the drive transistor (eg, channel size, threshold voltage, etc.).
  • the driving current flowing through the organic light emitting diodes in each pixel unit should be the same, so that the luminance of the organic light emitting diodes in each pixel unit remains sexuality in time and spatial uniformity.
  • this is not the case. Due to various factors such as process conditions, especially the influence of the voltage division of the power supply wiring itself, the driving current flowing through the LEDs in each pixel unit may be different, resulting in distortion of the brightness of each pixel unit of the display panel, and brightness may not occur. The problem of both.
  • the present invention proposes a new pressure drop compensation method for improving brightness unevenness of an organic light emitting display panel, and an organic light emitting display panel using the same.
  • the pressure drop compensation method comprises the following steps:
  • Equal to the power supply voltage OV dd combined with the data voltage output by the data driving unit to each pixel unit
  • V data,i to solve the driving current I ds,i in each pixel unit in this case by the following formula:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • V th represents a threshold voltage of a driving transistor in the pixel unit
  • K is an electrical parameter of a driving transistor in the pixel unit
  • n is a number of pixel units on the power supply wiring
  • R is the parasitic resistance of a section of the power supply wiring between two adjacent pixel units
  • step S300 Determine whether the result of step S200 meets the requirements:
  • the voltage OV dd,i at the junction of each pixel unit and the power supply wiring obtained by S200 is used to solve the driving current I ds,i in each pixel unit by the following formula:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • step S500 calculating a voltage difference between the power supply voltage and the voltage at the connection between each pixel unit and the power supply wiring obtained in step S200;
  • S600 Compensating for a data voltage output by the data driving unit to each pixel unit according to the voltage difference, and providing the compensated data voltage to the corresponding pixel unit.
  • step S300 it is determined whether the number of executions of step S200 is less than a threshold value. If yes, the process proceeds to step S400, and if no, the process proceeds to step S500.
  • step S300 it is determined whether the result of the following formula is less than the threshold, and if so, proceeds to step S400, and if not, proceeds to step S500;
  • (OV dd, i ) k represents the voltage at the k-th execution of the connection of each pixel unit and the power supply wiring obtained in step S200.
  • the corresponding compensation voltage may be calculated according to a given functional relationship according to the voltage difference, and the compensation voltage and the data voltage are superimposed and then provided to the corresponding pixel unit.
  • the compensation voltage is equal to the original data voltage plus the voltage difference.
  • the corresponding voltage data may be searched according to a given relationship table according to the voltage difference, and the data voltage outputted by the data driving unit is replaced by the voltage data, and then provided to the corresponding Pixel unit.
  • an organic light emitting display panel including:
  • a power supply unit that supplies a power supply voltage to each of the pixel units through a power supply wiring
  • a scan driving unit that outputs a scan signal to each of the pixel units through a scan line
  • a data driving unit that outputs a data voltage to each of the pixel units through a data line
  • a voltage drop compensation unit connected to the data driving unit for estimating a voltage at a connection between each pixel unit and a power supply line according to a data voltage output by the data driving unit to each of the pixel units, and then according to the voltage and The voltage difference between the power supply voltages compensates the data voltage output by the data driving unit to each of the pixel units, and supplies the compensated data voltage to each of the pixel units.
  • the voltage drop compensation unit estimates the voltage at the connection of each pixel unit and the power supply wiring by an iterative algorithm, and the algorithm includes:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • V th represents a threshold voltage of a driving transistor in the pixel unit
  • K is an electrical parameter of a driving transistor in the pixel unit
  • n is a number of pixel units on the power supply wiring
  • R is the parasitic resistance of a section of the power supply wiring between two adjacent pixel units
  • step S300 Determine whether the calculation result of step S200 meets the requirements:
  • the voltage O Vdd,i at the junction of each pixel unit and the power supply wiring obtained by S200 is used to solve the driving current I ds,i in each pixel unit by the following formula:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • step S500 calculating a power supply voltage and the connection between each pixel unit and the power supply wiring obtained in step S200 The voltage difference between the voltages.
  • step S300 it is determined whether the result of the following formula is less than a preset threshold, and if so, proceeds to step S400, and if not, proceeds to step S500;
  • (OV dd, i ) k represents the voltage at the k-th execution of the connection of each pixel unit and the power supply wiring obtained in step S200.
  • the above compensation voltage may be equal to the original data voltage plus the voltage difference.
  • the invention simulates the pressure drop of the OLED display panel by means of a nonlinear mathematical model, solves the nonlinear model by an iterative method, estimates the panel pressure drop, and compensates the data voltage in real time based on the estimation result, which can effectively improve the panel brightness unevenness.
  • the phenomenon is a nonlinear mathematical model, solves the nonlinear model by an iterative method, estimates the panel pressure drop, and compensates the data voltage in real time based on the estimation result, which can effectively improve the panel brightness unevenness.
  • the estimation accuracy of the panel pressure drop can be up to 99% by using the pressure drop compensation method of the invention, and the uniformity of the compensated rear panel can be increased by about 26.7%, effectively solving the pressure drop caused by the display panel in the prior art.
  • Technical problem of uneven brightness can be used.
  • FIG. 1 is a schematic diagram of an organic light emitting display panel and a pixel unit thereof in the prior art
  • FIG. 2 is a schematic diagram of a one-dimensional large-size organic light-emitting display panel according to Embodiment 1 of the present invention.
  • FIG. 3 is a schematic circuit diagram of a pixel unit on the panel shown in FIG. 2;
  • FIG. 4 is an equivalent circuit diagram of a pixel unit in the same column and connected to the same power supply line on the panel shown in FIG. 2;
  • FIG. 5 is a schematic block diagram of a voltage drop compensation unit according to Embodiment 1 of the present invention.
  • FIG. 6 is a working flow chart of a pressure drop compensation method according to Embodiment 1 of the present invention.
  • FIG. 7 is a working flow chart of a pressure drop compensation method according to Embodiment 2 of the present invention.
  • FIG. 8 is a schematic diagram of a two-dimensional large-size organic light-emitting display panel according to Embodiment 2 of the present invention.
  • FIG. 2 is a schematic diagram of a one-dimensional large-size organic light-emitting display panel according to Embodiment 1 of the present invention. Similar to the thin film transistor liquid crystal display panel, the organic light emitting display panel is arranged in a matrix form with M x N pixel units. Wherein: the N pixel units in the same row are electrically connected to the same scan line to receive the scan signal from the scan driving unit, for example, the pixel unit (i, 1), (i, 2) of the i-th row. ..
  • each pixel unit is also electrically connected to the power supply unit through the power supply wiring I, To receive the power supply voltage (indicated by OV dd in the figure).
  • the pixel unit of each column is provided with a power supply line I parallel to the data line, but it is not limited thereto.
  • FIG. 3 is a schematic diagram showing the circuit structure of a pixel unit on the panel shown in FIG.
  • the pixel unit is a common 2T1C structure, and is composed of a switching transistor T1, a driving transistor T2, a light emitting diode OLED, and a charging capacitor C.
  • the control end of the switching transistor T1 is connected to the corresponding scan line Gate_i
  • the first end is connected to the corresponding data line Data_j
  • the second end is connected to the control end of the driving transistor T2, and is driven.
  • the first end of the transistor T2 is connected to the power supply line I
  • the second end of the driving transistor T2 is connected to the anode of the LED OLED
  • the cathode of the LED OLED is electrically grounded (indicated by OV ss in the figure)
  • the first electrode of the charging capacitor C is And a second electrode is respectively connected to the control end and the first end of the driving transistor T2 for maintaining the voltage difference between the two ends.
  • the driving transistor T2 Since there is a voltage difference between the control terminal of the driving transistor T2 and the first terminal (the theoretical difference between the data voltage and the power supply voltage), the driving transistor T2 is turned on to output a corresponding driving current I ds .
  • the driving current flows through the light emitting diode OLED to drive it to emit light.
  • the luminance of the light emitting diode OLED is proportional to the magnitude of the driving current.
  • the magnitude of the driving current I ds is determined by the following equation:
  • I ds K ⁇ (V gs -V th ) 2
  • K is the drive transistor electrical parameter
  • V gs is the voltage difference between the control transistor control terminal and the first terminal
  • V th is the threshold voltage of the drive transistor
  • OV dd is the supply voltage
  • V data is the data voltage
  • the power supply wiring I has a parasitic resistance, there is a certain voltage drop on the power supply wiring when a drive current flows. This causes the voltage actually obtained along each pixel cell on the power supply wiring to be not equal to the power supply voltage OV dd .
  • the actual voltage at the junction of each pixel unit and the power supply wiring 1 ie, the first end of the driving transistor of each pixel unit
  • OV dd the actual voltage at the junction of each pixel unit and the power supply wiring 1 (ie, the first end of the driving transistor of each pixel unit) is OV dd,i .
  • FIG. 4 shows pixel units (1, j), (2, j), ... (n-1, j), (n, which are located in the jth column on the display panel and connected to the same power supply line I. j) equivalent circuit diagram.
  • the voltages at which the respective pixel units are connected to the power supply wiring I are OV dd, 1 , OV dd, 2 ... OV dd, n-1 , OV dd, n , and driving of each pixel unit.
  • the data voltage received by the control terminal of the transistor is V data, 1 , V data, 2 ...
  • V data, n-1 , V data, n , and the driving current flowing through the driving transistor to the light emitting diode in each pixel unit They are I ds,1 , I ds,2 ... I ds,n-1 , I ds,n . Further, the parasitic resistance of a section of the power supply wiring 1 between two adjacent pixel units is R.
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • the voltage at which each pixel unit is connected to the power supply line I is determined by the drive current flowing through the drive transistor to the light-emitting diode in each pixel unit. Further, it is known from the equation (2) that the voltage at which the respective pixel unit is connected to the power supply wiring I is determined by the data voltage received by the control terminal of the driving transistor in each pixel unit.
  • the inventors of the present invention have proposed to add a voltage drop compensation unit to the existing organic light-emitting display panel for compensating for the voltage drop caused by the resistance of the power supply wiring itself to improve the brightness unevenness of the display panel.
  • the voltage drop compensation unit can be divided into functions according to functions:
  • An iterative calculation module 110 is connected to the data driving unit of the display panel for iteratively estimating the voltage at the connection of each pixel unit and the power supply wiring I according to the data voltage output by the data driving unit;
  • the voltage compensation module 120 is connected to the calculation module 110 for compensating the data voltage output by the data driving unit according to the difference between the voltage provided by the calculation module 110 and the power supply voltage, and providing the compensated data voltage to the corresponding data. Pixel unit.
  • the above-mentioned voltage drop compensation unit may further include a data storage module 130 connected to the iterative calculation module 110 for storing intermediate results calculated by the iterative calculation module 110, for example, I ds, 1 , I ds, 2 ?? .Id s,n-1 , I ds,n .
  • the workflow of implementing the voltage drop compensation of the organic light emitting display panel provided with the above voltage drop compensation unit is as follows:
  • Equal to the power supply voltage OV dd combined with the data voltage output by the data driving unit to each pixel unit
  • V data,i to solve the driving current I ds,i in each pixel unit in this case by the following formula:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • K is the electrical parameter of the drive transistor in the pixel cell and Vth represents the threshold voltage of the drive transistor in the pixel cell.
  • R is the parasitic resistance of a section of the power supply wiring 1 between two adjacent pixel units.
  • step S300 Determine whether the number of executions of step S200 is less than a set threshold:
  • the voltage OV dd,i at the junction of each pixel unit and the power supply wiring obtained by S200 is used to solve the driving current I ds,i in each pixel unit by the following formula:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • the size of the threshold may be modified according to the brightness adjustment result.
  • the corresponding compensation voltage may be calculated according to a given functional relationship according to the voltage difference, and the compensation voltage and the data voltage are superimposed and then provided to the corresponding pixel unit.
  • the corresponding voltage data is searched according to the given relationship table according to the voltage difference, and the data voltage outputted by the data driving unit is replaced with the voltage data, and then supplied to the corresponding pixel unit.
  • the simplest functional relationship is to make the compensation voltage equal to the original data voltage plus the voltage difference. That is, how much the data voltage is lowered by the voltage drop (for the p-type driving transistor), so that the voltage between the control terminal and the first terminal of the driving transistor of each pixel unit remains unchanged, thereby making the brightness of the display panel It may remain evenly.
  • the first embodiment determines whether to continue the iterative calculation according to whether the number of executions of step S200 satisfies a certain requirement.
  • it can be far from being limited to this.
  • it is also possible to determine whether to continue the iterative calculation by judging whether the voltage OV dd,i at the connection of each pixel unit and the power supply wiring obtained in step S200 satisfies a certain requirement.
  • FIG. 7 is a flow chart showing the operation of the panel voltage drop compensation method according to Embodiment 2 of the present invention.
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • K is the electrical parameter of the drive transistor in the pixel cell and Vth represents the threshold voltage of the drive transistor in the pixel cell.
  • R is the parasitic resistance of a section of the power supply wiring 1 between two adjacent pixel units.
  • the voltage OV dd,i at the junction of each pixel unit and the power supply wiring obtained by S200 is used to solve the driving current I ds,i in each pixel unit by the following formula:
  • I ds,i K ⁇ (OV dd,i -V data,i -
  • R is the parasitic resistance of a section of the power supply wiring 1 between two adjacent pixel units.
  • step S500 determining whether the result of the following formula is less than a preset threshold according to the voltage OV dd,i of each pixel unit and the power wiring connection obtained in step S300, and if yes, proceeding to step S600, and if not, returning to step S300 to continue the iterative calculation.
  • (OV dd, i ) k represents the voltage at the k-th execution of the connection of each pixel unit and the power supply wiring obtained in step S200. That is, it is checked whether the voltage at the connection of each pixel unit and the power supply wiring obtained in the last execution of step S200 with respect to the voltage at the connection of each pixel unit and the power supply wiring obtained in the previous execution of step S200 satisfies a certain value. Claim.
  • step S600 according to the voltage difference ⁇ OV dd,i between the power supply voltage OV dd and the voltage OV dd,i at the connection between each pixel unit and the power supply wiring obtained in step S200, the data voltage output to the respective pixel unit by the data driving unit Compensation is performed to supply the compensated data voltage to the corresponding pixel unit.
  • the size of the threshold may be modified according to the brightness adjustment result.
  • the determining step of whether to continue the iterative calculation can be flexibly set. Therefore, the method of the present invention should not be limited to the specific order of program execution, and should not be a technical solution capable of achieving the object of the present invention. It is excluded from the scope of protection of the present invention.
  • the organic light emitting display panel adopting the above voltage drop compensation method may also be a two-dimensional display panel.
  • FIG. 8 is a schematic diagram of a two-dimensional large-size organic light-emitting display panel provided by the present invention.
  • each row/column of pixel cells is provided with a power supply wiring I parallel to the scan line/data line.
  • the inventors of the present invention proposed to use two pressure drop compensation units to separately calculate two sets of voltage difference values, and respectively perform compensation operations in the X direction and the Y direction. That is, when the compensation is calculated based on OV dd in the X direction in the X direction, the Y direction OV dd considered GND. Conversely, when the compensation is calculated based on OV dd direction Y in the Y direction, the X direction OV dd considered GND. Finally, the compensation calculation results in the two directions are superposition.

Landscapes

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

Abstract

一种有机发光显示面板及其压降补偿方法。该有机发光显示面板增设有一压降补偿单元，其连接数据驱动单元，用于根据所述数据驱动单元输出的数据电压（Vdata1-Vdatan）通过内置的迭代算法推算各个像素单元与电源配线（I）连接处的电压（OVdd1-OVDDn），然后根据所述电压（OVdd1-OVDDn）与电源电压（OVdd）之间的电压差值对所述数据驱动单元输出的数据电压（Vdata1-Vdatan）进行补偿。

Description

一种有机发光显示面板及其压降补偿方法
本申请要求享有2015年01月19日提交的名称为“一种有机发光显示面板及其压降补偿方法”的中国专利申请为CN201510025858.8的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示面板技术，尤其是一种有机发光显示面板及其压降补偿方法。
背景技术
近年来，有机发光显示面板以其超轻薄、自发光、低功耗、高效率、高对比度和响应速度快等优点成为了继薄膜晶体管液晶显示面板之后市场上最受欢迎的产品。
图1是现有技术中一个有机发光显示面板及其像素单元的示意图。通常，有机发光显示面板以逐行扫描的方式输出画面。即，通过发送扫描信号逐行开启像素单元中的开关晶体管(图中标示为T1)，使得像素单元中的驱动晶体管(图中标示为T2)接收表征图像信息的数据电压。在数据电压和电源电压的共同作用下，驱动晶体管导通而产生相应的驱动电流，提供给有机发光二级管(图中标示为OLED)，驱动有机发光二级管发光工作。有机发光二级管的发光亮度取决于其流经的电流IOLED的大小，而该电流IOLED等于驱动晶体管T2的漏源极电流Ids(也称驱动电流)。对于驱动晶体管T2而言，驱动电流Ids通过下式决定：
Ids＝K·(Vgs-Vth)2
＝K·(OVdd-Vdata-|Vth|)2
式中，K是驱动晶体管电性参数，Vgs是驱动晶体管栅源极电压，Vth是驱动晶体管的阈值电压，OVdd是电源电压，Vdata是数据电压。
由上式可知，驱动电流的大小与电源电压和数据电压，以及驱动晶体管的电性参数(例如沟道尺寸、阈值电压等)密切相关。
理论上，由于一个显示面板上所有的像素单元会采用同一种驱动晶体管，且 在相同的电压电源的作用下工作，因此当向所有的像素单元输入相同的数据电压时，各个像素单元中流经有机发光二极管的驱动电流应当相同，使得各个像素单元中有机发光二极管的发光亮度保持时间上的同一性和空间上的均匀性。然而实际情况并非如此。由于工艺条件等多种因素的影响，特别是电源配线自身电阻分压的影响，各个像素单元中流经发光二极管的驱动电流会有差异，导致显示面板各个像素单元的亮度失真，会出现亮度不均的问题。特别是，近年来随着显示技术的不断发展，显示面板的尺寸越来越大，相应地，为各个像素单元提供电源电压的电源配线也越来越长。这就使得显示面板亮度不均的问题更加严重，成为了业内相关技术人员亟待解决的一项课题。
发明内容
针对上述问题，本发明提出一种新的用于改善有机发光显示面板亮度不均的压降补偿方法，以及采用该方法的有机发光显示面板。
该压降补偿方法，包括以下步骤：
S100，假设沿著电源配线上的各个像素单元与电源配线连接处的电压OVdd，i
均等于电源电压OVdd，结合数据驱动单元向各个像素单元输出的数据电压
Vdata，i，通过下式求解在此情况下各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
OVdd，1＝OVdd，2＝...＝OVdd，i＝OVdd
其中，i＝1，2......n
式中，Vth表示像素单元中驱动晶体管的阈值电压；K是像素单元中驱动晶体管的电性参数，n是电源配线上的像素单元的个数；
S200，将各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
Figure PCTCN2015071842-appb-000001
其中，i＝1，2......n
式中，R是相邻两个像素单元之间的一段电源配线的寄生电阻；
S300，判断步骤S200的结果是否满足要求：
是，进入步骤S400；
否，进入步骤S500；
S400，根据数据驱动单元输出给各个像素单元的数据电压Vdata，i，以及步骤
S200获得的各个像素单元与电源配线连接处的电压OVdd，i，通过下式求解各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
其中，i＝1，2......n
返回步骤S200；
S500，计算电源电压与步骤S200获得的各个像素单元与电源配线连接处的电压之间的电压差值；
S600，根据电压差值对数据驱动单元输出给各个像素单元的数据电压进行补偿，将补偿后的数据电压提供给对应的像素单元。
根据本发明的一个实施例，上述步骤S300中，判断步骤S200的执行次数是否小于阈值，若是，进入步骤S400，若否，进入步骤S500。
根据本发明的另一个实施例，上述步骤S300中，判断下式结果是否小于阈值，若是，进入步骤S400，若否，进入步骤S500；
Figure PCTCN2015071842-appb-000002
式中，(OVdd，i)k表示第k次执行步骤S200所获得的各个像素单元与电源配线连接处的电压。
此外，还可以根据亮度调节结果设定或修改所述步骤S300中的阈值。
根据本发明的一个实施例，上述步骤S600中，可以根据电压差值按照给定的函数关系计算相应的补偿电压，将补偿电压与数据电压叠加后，提供给对应的像素单元。
进一步地，上述步骤S600中，补偿电压等于原始的数据电压加上电压差值。
根据本发明的另一个实施例，上述步骤S600中，可以根据电压差值按照给定的关系表查找相应的电压数据，将数据驱动单元输出的数据电压置换为此电压数据后，提供给对应的像素单元。
此外，本发明还提供一种有机发光显示面板，其包括：
若干像素单元；
电源供电单元，其通过电源配线向各所述像素单元提供电源电压；
扫描驱动单元，其通过扫描线向各所述像素单元输出扫描信号；
数据驱动单元，其通过数据线向各所述像素单元输出数据电压；
压降补偿单元，其连接所述数据驱动单元，用于根据所述数据驱动单元向各所述像素单元输出的数据电压推算各个像素单元与电源配线连接处的电压，然后根据所述电压与电源电压之间的电压差值对所述数据驱动单元向各所述像素单元输出的数据电压进行补偿，将补偿后的数据电压提供给各所述像素单元。
根据本发明的实施例，上述压降补偿单元通过迭代算法推算各个像素单元与电源配线连接处的电压，所述算法包括：
S100，假设沿著电源配线上的各个像素单元与电源配线连接处的电压OVdd，i均等于电源电压OVdd，结合数据驱动单元向各个像素单元输出的数据电压Vdata，i，通过下式求解在此情况下各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
OVdd，1＝OVdd，2＝...＝OVdd，i＝OVdd
其中，i＝1，2......n
式中，Vth表示像素单元中驱动晶体管的阈值电压；K是像素单元中驱动晶体管的电性参数，n是电源配线上的像素单元的个数；
S200，将各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
Figure PCTCN2015071842-appb-000003
其中，i＝1，2......n
式中，R是相邻两个像素单元之间的一段电源配线的寄生电阻；
S300，判断步骤S200的计算结果是否满足要求：
是，进入步骤S400；
否，进入步骤S500；
S400，根据数据驱动单元输出给各个像素单元的数据电压Vdata，i，以及步骤
S200获得的各个像素单元与电源配线连接处的电压OVdd，i，通过下式求解各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
其中，i＝1，2......n
返回步骤S200；
S500，计算电源电压与步骤S200获得的各个像素单元与电源配线连接处的 电压之间的电压差值。
具体地，根据本发明的实施例，上述步骤S300中，判断下式结果是否小于预设的阈值，若是，进入步骤S400，若否，进入步骤S500；
Figure PCTCN2015071842-appb-000004
式中，(OVdd，i)k表示第k次执行步骤S200所获得的各个像素单元与电源配线连接处的电压。
根据本发明的实施例，上述补偿电压可以等于原始的数据电压加上电压差值。
与现有技术相比，本发明的一个或多个实施例具有以下优点：
本发明借助非线性数学模型来模拟有机发光二极管显示面板的压降，利用迭代法求解此非线性模型，对面板压降进行估算，并基于估算结果实时补偿数据电压，能够有效改善面板亮度不均的现象。
通过模拟验证，利用本发明的压降补偿方法对面板压降的估测精度可以高達99％以上，补偿后面板均勻度可以大约提升26.7％，有效解决了现有技术中显示面板因压降导致亮度不均的技术问题。
附图说明
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例共同用于解释本发明，并不构成对本发明的限制。在附图中：
图1是现有技术中一个有机发光显示面板及其像素单元的示意图；
图2是本发明实施例一提供的一维大尺寸有机发光显示面板的示意图；
图3是图2所示面板上的像素单元的电路结构示意图；
图4是图2所示面板上位于同一列且连接同一根电源配线的像素单元的等效电路图；
图5是本发明实施例一提供的压降补偿单元的组成模块示意图；
图6是本发明实施例一提供的压降补偿方法的工作流程图；
图7是本发明实施例二提供的压降补偿方法的工作流程图；
图8是本发明实施例二提供的二维大尺寸有机发光显示面板的示意图。
具体实施方式
为使本发明的上述目的、特征和优点能够更加明显易懂，下面结合附图和实施例对本发明的技术方案作进一步的描述。需要注意的是，虽然在下面的描述中阐述了很多细节以便于充分理解本发明，但是本发明还可以采用不同于在此描述的其它方式来实施，因此本发明不受下面公开的具体实施例的限制。
实施例一
图2是本发明实施例一提供的一维大尺寸有机发光显示面板的示意图。与薄膜晶体管液晶显示面板类似，该有机发光显示面板以矩阵形式排布有M×N个像素单元。其中：位于同一行的N个像素单元电性连接同一根扫描线，以接收来自扫描驱动单元的扫描信号，例如第i行的像素单元(i，1)、(i，2)......(i，N)电性连接第i根扫描线Gate_i；位于同一列的M个像素单元电性连接同一根数据线，以接收来自数据驱动单元的数据电压，例如第j列像素单元(1，j)、(2，j)......(M，j)电性连接第j根数据线Data_j；同时，每一个像素单元还通过电源配线I电性连接电源供电单元，以接收电源电压(图中以OVdd标示)。对于图2所示的一维显示面板，每一列的像素单元配置有一根平行于数据线的电源配线I，当然也可不限于此。
图3是图2所示面板上的像素单元的电路结构示意图。从图3可知，像素单元为常见的2T1C结构，由开关晶体管T1、驱动晶体管T2、发光二极管OLED和充电电容C构成。以第i行第j列的像素单元为例，其中：开关晶体管T1的控制端连接对应的扫描线Gate_i，第一端连接对应的数据线Data_j，第二端连接驱动晶体管T2的控制端，驱动晶体管T2的第一端连接电源配线I，驱动晶体管T2的第二端连接发光二极管OLED的正极，发光二极管OLED的负极电性接地(图中以OVss标示)，充电电容C的第一电极和第二电极分别连接驱动晶体管T2的控制端和第一端，用于维持这两端的压差。当扫描线Gate_i上收到扫描信号时，开关晶体管T1导通，数据线Data_j上的数据电压传至驱动晶体管T2的控制端。由于驱动晶体管T2的控制端与第一端之间存在电压差(理论上是数据电压与电源电压的差值)，驱动晶体管T2导通而输出相应的驱动电流Ids。驱动电流流经发光二极管OLED，驱使其发光工作。发光二极管OLED的发光亮度与该驱动电流的大小成正比。对于驱动晶体管T2而言，驱动电流Ids的大小通过下式决定：
Ids＝K·(Vgs-Vth)2
＝K·(OVdd-Vdata-|Vth|)2
式中，K是驱动晶体管电性参数，Vgs是驱动晶体管控制端与第一端之间的电压差，Vth是驱动晶体管的阈值电压，OVdd是电源电压，Vdata是数据电压。
正如背景技术介绍的那样，在实际应用中，由于电源配线I具有寄生电阻，当有驱动电流流过时，电源配线上会有一定的压降。这导致沿著电源配线上的各个像素单元实际获得的电压不等于电源电压OVdd。为与电源电压OVdd区别，以下将各个像素单元与电源配线I的连接处(即各个像素单元的驱动晶体管的第一端)的实际电压标记为OVdd，i。
图4显示了显示面板上位于第j列且连接同一根电源配线I的像素单元(1，j)、(2，j)......(n-1，j)、(n，j)的等效电路图。图4中，各个像素单元与电源配线I连接处的电压分别为OVdd，1、OVdd，2......OVdd，n-1、OVdd，n，各个像素单元的驱动晶体管的控制端接收的数据电压分别为Vdata，1、Vdata，2......Vdata，n-1、Vdata，n，各个像素单元中经驱动晶体管流向发光二极管的驱动电流分别为Ids，1、Ids，2......Ids，n-1、Ids，n。此外，相邻两个像素单元之间的一段电源配线I的寄生电阻为R。
其中，对于像素单元(n，j)，有以下关系：
Figure PCTCN2015071842-appb-000005
依次递推，有：
Figure PCTCN2015071842-appb-000006
因此，对于像素单元(i，j)，有以下关系：
Figure PCTCN2015071842-appb-000007
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2).....(2)
其中，i＝1，2......n
由式(1)可知，各个像素单元与电源配线I连接处的电压由各个像素单元中经驱动晶体管流向发光二极管的驱动电流共同决定。进一步地，由式(2)可知，各个像素单元与电源配线I连接处的电压由各个像素单元中驱动晶体管的控制端接收的数据电压共同决定。
对此，本发明的发明人提出在现有的有机发光显示面板中增加一个压降补偿单元，用于对由电源配线自身电阻导致的压降进行补偿，以改善显示面板亮度不均的现象。如图5所示，该压降补偿单元按照功能可以划分为：
迭代计算模块110，其连接显示面板的数据驱动单元，用于根据数据驱动单元输出的数据电压迭代推算各个像素单元与电源配线I连接处的电压；
电压补偿模块120，其连接计算模块110，用于根据计算模块110提供的电压与电源电压之间的差值，对数据驱动单元输出的数据电压进行补偿，将补偿后的数据电压提供给对应的像素单元。
当然，上述压降补偿单元还可以包括与迭代计算模块110连接的数据存储模块130，用于存储迭代计算模块110计算的中间结果，例如，Ids，1、Ids，2......Ids，n-1、Ids，n。
如图6所示，设置有上述压降补偿单元的有机发光显示面板实施压降补偿的工作流程如下：
S100，假设沿著电源配线上的各个像素单元与电源配线连接处的电压OVdd，i
均等于电源电压OVdd，结合数据驱动单元向各个像素单元输出的数据电压
Vdata，i，通过下式求解在此情况下各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
OVdd，1＝OVdd，2＝...＝OVdd，i＝OVdd
其中，i＝1，2......n
式中，K是像素单元中驱动晶体管的电性参数，Vth表示像素单元中驱动晶体管的阈值电压。
S200，将各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
Figure PCTCN2015071842-appb-000008
其中，i＝1，2......n
式中，R是相邻两个像素单元之间的一段电源配线I的寄生电阻。
S300，判断步骤S200执行次数是否小于设定的阈值：
是，进入步骤S400；
否，进入步骤S500。
S400，根据数据驱动单元输出给各个像素单元的数据电压Vdata，i，以及步骤
S200获得的各个像素单元与电源配线连接处的电压OVdd，i，通过下式求解各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
其中，i＝1，2......n
返回步骤S200。
S500，计算电源电压OVdd与步骤S200获得的各个像素单元与电源配线连接处的电压OVdd，i之间的电压差值ΔOVdd，i。
S600，根据电压差值ΔOVdd，i对数据驱动单元输出给各个像素单元的数据电压进行补偿，将补偿后的数据电压提供给对应的像素单元。
在具体实施时，上述步骤S300中，所述阈值的大小可以根据亮度调节结果修改。
在具体实施时，上述步骤S600中，可以根据电压差值按照给定的函数关系计算相应的补偿电压，将补偿电压与数据电压叠加后，提供给对应的像素单元。又或者，根据电压差值按照给定的关系表查找相应的电压数据，将数据驱动单元输出的数据电压置换为此电压数据后，提供给对应的像素单元。
对于前一种方式，最简单的函数关系是令补偿电压等于原始的数据电压加上电压差值。即，电压下降多少就降低多少数据电压(对p型驱动晶体管而言)，使得各个像素单元的驱动晶体管的控制端与第一端之间的电压保持不变，从而使显示面板的发光亮度尽可能地保持均匀。
实施例二
实施例一是根据步骤S200的执行次数是否满足一定的要求来判断是否继续进行迭代计算。当然在实际应用中，可以远不限于此。例如还可以通过判断步骤S200获得的各个像素单元与电源配线连接处的电压OVdd，i是否满足一定的要求来判断是否继续进行迭代计算。
图7显示了本发明实施例二提供的面板压降补偿方法的工作流程图。
S100，假设沿著电源配线上的各个像素单元与电源配线连接处的电压OVdd，i均等于电源电压OVdd，结合数据驱动单元向各个像素单元输出的数据电压Vdata，i，通过下式求解在此情况下各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
OVdd，1＝OVdd，2＝...＝OVdd，i＝OVdd
其中，i＝1，2......n
式中，K是像素单元中驱动晶体管的电性参数，Vth表示像素单元中驱动晶体管的阈值电压。
S200，将各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
Figure PCTCN2015071842-appb-000009
其中，i＝1，2......n
式中，R是相邻两个像素单元之间的一段电源配线I的寄生电阻。
S300，根据数据驱动单元输出给各个像素单元的数据电压Vdata，i，以及步骤
S200获得的各个像素单元与电源配线连接处的电压OVdd，i，通过下式求解各个像素单元中的驱动电流Ids，i：
Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
其中，i＝1，2......n
S400，将步骤S300获得的各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
Figure PCTCN2015071842-appb-000010
其中，i＝1，2......n
式中，R是相邻两个像素单元之间的一段电源配线I的寄生电阻。
S500，根据步骤S300获得的各个像素单元与电源配线连接处的电压OVdd，i判断下式结果是否小于预设的阈值，若是，进入步骤S600，若否，返回步骤S300继续迭代计算。
Figure PCTCN2015071842-appb-000011
式中，(OVdd，i)k表示第k次执行步骤S200所获得的各个像素单元与电源配线连接处的电压。也即，考察最近一次执行步骤S200所获得的各个像素单元与电源配线连接处的电压相对于前一次执行步骤S200所获得的各个像素单元与电源配线连接处的电压的变化是否满足一定的要求。
S600，根据电源电压OVdd与步骤S200获得的各个像素单元与电源配线连接处的电压OVdd，i之间的电压差值ΔOVdd，i，对数据驱动单元输出给各个像素单元的数据电压进行补偿，将补偿后的数据电压提供给对应的像素单元。
在具体实施时，上述步骤S500中，所述阈值的大小可以根据亮度调节结果修改。
由上述两个实施例可知，是否继续进行迭代计算的判断步骤可以灵活地设置，因此本发明的方法不应当局限于程序执行的具体顺序，只要是能够实现本发明目的的技术方案，均不应排除在本发明的保护范围之外。
需要说明的是，采用上述压降补偿方法的有机发光显示面板还可以是二维显示面板。图8是本发明提供的一种二维大尺寸有机发光显示面板的示意图。对于二维显示面板，每一行/列的像素单元配置有一根平行于扫描线/数据线的电源配线I。对此，本发明的发明人提出采用两个压降补偿单元分别计算两组电压差值，分别完成X方向上和Y方向上的补偿操作。即，当基于X方向上的OVdd进行X方向的补偿计算时，将Y方向上的OVdd视为GND。反之，当基于Y方向上的OVdd进行Y方向的补偿计算时，将X方向上的OVdd视为GND。最后将两个方向的补偿计算结果做叠加(superposition)。
虽然本发明所披露的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用于限定本发明。例如，像素单元的结构不限于2T1C。任何本发明所属技术领域内的技术人员，在不脱离本发明所揭露的精神和范围的前提下，在实施的形式上及细节上所作的任何修改与变化，都应该在本发明的专利保护范围内。

Claims (20)

  1. 一种有机发光显示面板的压降补偿方法，包括以下步骤：
    S100，假设沿著电源配线上的各个像素单元与电源配线连接处的电压OVdd，i均等于电源电压OVdd，结合数据驱动单元向各个像素单元输出的数据电压Vdata，i，通过下式求解在此情况下各个像素单元中的驱动电流Ids，i：
    Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
    OVdd，1＝OVdd，2＝...＝OVdd，i＝OVdd
    其中，i＝1，2......n
    式中，Vth表示像素单元中驱动晶体管的阈值电压；K是像素单元中驱动晶体管的电性参数，n是电源配线上的像素单元的个数；
    S200，将各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
    Figure PCTCN2015071842-appb-100001
    其中，i＝1，2......n
    式中，R是相邻两个像素单元之间的一段电源配线的寄生电阻；
    S300，判断步骤S200的结果是否满足要求：
    是，进入步骤S400；
    否，进入步骤S500；
    S400，根据数据驱动单元输出给各个像素单元的数据电压Vdata，i，以及步骤S200获得的各个像素单元与电源配线连接处的电压OVdd，i，通过下式求解各个像素单元中的驱动电流Ids，i：
    Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
    其中，i＝1，2......n
    返回步骤S200；
    S500，计算电源电压与步骤S200获得的各个像素单元与电源配线连接处的电压之间的电压差值；
    S600，根据电压差值对数据驱动单元输出给各个像素单元的数据电压进行补偿，将补偿后的数据电压提供给对应的像素单元。
  2. 如权利要求1所述的压降补偿方法，其中：
    所述步骤S300中，判断步骤S200的执行次数是否小于阈值，若是，进入步 骤S400，若否，进入步骤S500。
  3. 如权利要求1所述的压降补偿方法，其中：
    所述步骤S300中，判断下式结果是否小于阈值，若是，进入步骤S400，若否，进入步骤S500；
    Figure PCTCN2015071842-appb-100002
    式中，(OVdd，i)k表示第k次执行步骤S200所获得的各个像素单元与电源配线连接处的电压。
  4. 如权利要求2所述的压降补偿方法，其中：
    根据亮度调节结果设定或修改所述阈值。
  5. 如权利要求3所述的压降补偿方法，其中：
    根据亮度调节结果设定或修改所述阈值。
  6. 如权利要求1所述的压降补偿方法，其中：
    所述步骤S600中，根据电压差值按照给定的函数关系计算相应的补偿电压，将补偿电压与数据电压叠加后，提供给对应的像素单元。
  7. 如权利要求2所述的压降补偿方法，其中：
    所述步骤S600中，根据电压差值按照给定的函数关系计算相应的补偿电压，将补偿电压与数据电压叠加后，提供给对应的像素单元。
  8. 如权利要求3所述的压降补偿方法，其中：
    所述步骤S600中，根据电压差值按照给定的函数关系计算相应的补偿电压，将补偿电压与数据电压叠加后，提供给对应的像素单元。
  9. 如权利要求6所述的压降补偿方法，其中：
    所述步骤S600中，补偿电压等于原始的数据电压加上电压差值。
  10. 如权利要求7所述的压降补偿方法，其中：
    所述步骤S600中，补偿电压等于原始的数据电压加上电压差值。
  11. 如权利要求8所述的压降补偿方法，其中：
    所述步骤S600中，补偿电压等于原始的数据电压加上电压差值。
  12. 如权利要求1所述的压降补偿方法，其中：
    所述步骤S600中，根据电压差值按照给定的关系表查找相应的电压数据，将数据驱动单元输出的数据电压置换为此电压数据后，提供给对应的像素单元。
  13. 如权利要求2所述的压降补偿方法，其中：
    所述步骤S600中，根据电压差值按照给定的关系表查找相应的电压数据，将数据驱动单元输出的数据电压置换为此电压数据后，提供给对应的像素单元。
  14. 如权利要求3所述的压降补偿方法，其中：
    所述步骤S600中，根据电压差值按照给定的关系表查找相应的电压数据，将数据驱动单元输出的数据电压置换为此电压数据后，提供给对应的像素单元。
  15. 一种有机发光显示面板，其中，包括：
    若干像素单元；
    电源供电单元，其通过电源配线向各所述像素单元提供电源电压；
    扫描驱动单元，其通过扫描线向各所述像素单元输出扫描信号；
    数据驱动单元，其通过数据线向各所述像素单元输出数据电压；
    压降补偿单元，其连接所述数据驱动单元，用于根据所述数据驱动单元向各所述像素单元输出的数据电压推算各个像素单元与电源配线连接处的电压，然后根据所述电压与电源电压之间的电压差值对所述数据驱动单元向各所述像素单元输出的数据电压进行补偿，将补偿后的数据电压提供给各所述像素单元。
  16. 如权利要求15所述的有机发光显示面板，其中，所述压降补偿单元通过迭代算法推算各个像素单元与电源配线连接处的电压，所述算法包括：
    S100，假设沿著电源配线上的各个像素单元与电源配线连接处的电压OVdd，i均等于电源电压OVdd，结合数据驱动单元向各个像素单元输出的数据电压Vdata，i，通过下式求解在此情况下各个像素单元中的驱动电流Ids，i：
    Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
    OVdd，1＝OVdd，2＝...＝OVdd，i＝OVdd
    其中，i＝1，2......n
    式中，Vth表示像素单元中驱动晶体管的阈值电压；K是像素单元中驱动晶体管的电性参数，n是电源配线上的像素单元的个数；
    S200，将各个像素单元中的驱动电流Ids，i代入下式，求解所对应的各个像素单元与电源配线连接处的电压OVdd，i：
    Figure PCTCN2015071842-appb-100003
    其中，i＝1，2......n
    式中，R是相邻两个像素单元之间的一段电源配线的寄生电阻；
    S300，判断步骤S200的计算结果是否满足要求：
    是，进入步骤S400；
    否，进入步骤S500；
    S400，根据数据驱动单元输出给各个像素单元的数据电压Vdata，i，以及步骤S200获得的各个像素单元与电源配线连接处的电压OVdd，i，通过下式求解各个像素单元中的驱动电流Ids，i：
    Ids，i＝K·(OVdd，i-Vdata，i-|Vth|2)
    其中，i＝1，2......n
    返回步骤S200；
    S500，计算电源电压与步骤S200获得的各个像素单元与电源配线连接处的电压之间的电压差值。
  17. 如权利要求15所述的有机发光显示面板，其中：
    所述步骤S300中，判断下式结果是否小于预设的阈值，若是，进入步骤S400，若否，进入步骤S500；
    Figure PCTCN2015071842-appb-100004
    式中，(OVdd，i)k表示第k次执行步骤S200所获得的各个像素单元与电源配线连接处的电压。
  18. 如权利要求16所述的有机发光显示面板，其中：
    所述步骤S300中，判断下式结果是否小于预设的阈值，若是，进入步骤S400，若否，进入步骤S500；
    Figure PCTCN2015071842-appb-100005
    式中，(OVdd，i)k表示第k次执行步骤S200所获得的各个像素单元与电源配线连接处的电压。
  19. 如权利要求15所述的有机发光显示面板，其中：
    补偿电压等于原始的数据电压加上电压差值。
  20. 如权利要求16所述的有机发光显示面板，其中：
    补偿电压等于原始的数据电压加上电压差值。
PCT/CN2015/071842 2015-01-19 2015-01-29 一种有机发光显示面板及其压降补偿方法 Ceased WO2016115752A1 (zh)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US14/778,104 US9812064B2 (en) 2015-01-19 2015-01-29 Organic light-emitting display panel and method for compensating voltage drop thereof

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201510025858.8A CN104537985B (zh) 2015-01-19 2015-01-19 一种有机发光显示面板及其压降补偿方法
CN201510025858.8 2015-01-19

Publications (1)

Publication Number Publication Date
WO2016115752A1 true WO2016115752A1 (zh) 2016-07-28

Family

ID=52853502

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2015/071842 Ceased WO2016115752A1 (zh) 2015-01-19 2015-01-29 一种有机发光显示面板及其压降补偿方法

Country Status (3)

Country Link
US (1) US9812064B2 (zh)
CN (1) CN104537985B (zh)
WO (1) WO2016115752A1 (zh)

Families Citing this family (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104821152B (zh) * 2015-05-28 2017-09-01 深圳市华星光电技术有限公司 补偿amoled电压降的方法及系统
CN105405405B (zh) * 2016-01-04 2018-06-08 京东方科技集团股份有限公司 电压降补偿方法及装置、显示装置
CN106128359A (zh) * 2016-09-06 2016-11-16 昆山国显光电有限公司 Oled 显示装置及其亮度补偿方法
CN106409232A (zh) * 2016-10-31 2017-02-15 昆山国显光电有限公司 补偿电压确定方法、装置、补偿方法、系统及驱动芯片
CN106409231B (zh) * 2016-10-31 2018-10-12 昆山国显光电有限公司 一种亮度补偿方法、装置及显示设备
CN106847175B (zh) * 2017-03-01 2018-12-28 京东方科技集团股份有限公司 电致发光显示屏及其亮度均匀性补偿方法、系统
CN107180613B (zh) * 2017-05-26 2019-03-12 京东方科技集团股份有限公司 有机发光二极管显示面板及其驱动方法
CN107103879B (zh) * 2017-06-07 2019-08-06 京东方科技集团股份有限公司 一种有机发光显示面板的补偿方法及装置
CN108510431A (zh) * 2018-03-20 2018-09-07 福建华佳彩有限公司 AMOLED节省硬件存储空间的IR drop补偿方法
CN108510940B (zh) * 2018-05-10 2020-04-07 昆山国显光电有限公司 显示屏、显示屏亮度的补偿方法及补偿装置
CN111862891B (zh) * 2019-04-25 2021-10-01 上海和辉光电股份有限公司 一种有机发光显示器
CN110767178B (zh) * 2019-11-08 2021-01-22 京东方科技集团股份有限公司 一种有机发光二极管的电压补偿方法
CN110782835A (zh) * 2019-11-29 2020-02-11 深圳市华星光电半导体显示技术有限公司 Oled显示面板ovss电压降的改善方法及oled显示面板
CN112017595A (zh) * 2020-09-02 2020-12-01 Tcl华星光电技术有限公司 显示面板及电子设备
US11348528B2 (en) 2020-09-02 2022-05-31 Tcl China Star Optoelectronics Technology Co., Ltd. Display panel for outputting different setting voltage based on equivalent resistance
TWI772888B (zh) * 2020-09-11 2022-08-01 友達光電股份有限公司 顯示面板及拼接面板
CN112599098B (zh) * 2021-01-07 2021-11-02 深圳市华星光电半导体显示技术有限公司 改善oled显示装置亮度均一性的系统
CN113241038B (zh) * 2021-05-14 2022-10-04 深圳市华星光电半导体显示技术有限公司 显示面板及电子装置
CN113554984B (zh) * 2021-09-18 2022-10-21 苇创微电子(上海)有限公司 一种显示器IR-Drop的全局统计校准方法
WO2023159544A1 (zh) * 2022-02-28 2023-08-31 京东方科技集团股份有限公司 数据驱动方法、源极驱动器和显示装置
CN115662353B (zh) * 2022-12-26 2023-03-17 惠科股份有限公司 像素驱动电路、电阻补偿方法以及显示面板
CN117116204A (zh) * 2023-08-28 2023-11-24 合肥工业大学 一种显示面板电压降的补偿方法、系统、设备及介质
CN116884350B (zh) * 2023-09-07 2024-01-16 惠科股份有限公司 像素驱动电路、显示面板及显示装置
CN119863980B (zh) * 2025-02-27 2025-10-03 长沙惠科光电有限公司 显示面板驱动方法、显示面板驱动电路及显示设备

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100923347B1 (ko) * 2007-02-12 2009-10-22 엘지디스플레이 주식회사 유기발광표시장치
US20120236041A1 (en) * 2011-03-14 2012-09-20 Oh Choon-Yul Active matrix display and method of driving the same
US20120249514A1 (en) * 2011-04-01 2012-10-04 Jung-Keun Ahn Organic light emitting display device, data driving apparatus for organic light emitting display device, and driving method thereof
CN103268756A (zh) * 2013-05-29 2013-08-28 上海中科高等研究院 Amoled电压外部补偿方法及系统
CN103996374A (zh) * 2014-05-12 2014-08-20 京东方科技集团股份有限公司 外部动态补偿显示屏有源区直流电压降的装置及方法

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3629867B2 (ja) * 1997-01-10 2005-03-16 ソニー株式会社 プラズマアドレス表示装置
JP3741199B2 (ja) * 2000-09-13 2006-02-01 セイコーエプソン株式会社 電気光学装置およびその駆動方法、並びに電子機器
KR100365693B1 (ko) * 2000-09-26 2002-12-26 삼성에스디아이 주식회사 교류 플라즈마 디스플레이 패널의 유지방전 회로
US7071635B2 (en) * 2001-09-26 2006-07-04 Sanyo Electric Co., Ltd. Planar display apparatus
JP2003167551A (ja) * 2001-11-28 2003-06-13 Internatl Business Mach Corp <Ibm> 画素回路の駆動方法、画素回路及びこれを用いたｅｌ表示装置並びに駆動制御装置
KR100438966B1 (ko) * 2001-12-28 2004-07-03 엘지.필립스 엘시디 주식회사 다른 위상을 갖는 공통전압이 인가되는 액정표시소자 및액정표시소자의 구동방법
US7030842B2 (en) * 2002-12-27 2006-04-18 Lg.Philips Lcd Co., Ltd. Electro-luminescence display device and driving method thereof
JP2004341267A (ja) * 2003-05-16 2004-12-02 Casio Comput Co Ltd 表示駆動装置及び表示装置並びにその駆動制御方法
TWI371018B (en) * 2006-05-09 2012-08-21 Chimei Innolux Corp System for displaying image and driving display element method
TW201232519A (en) * 2011-01-28 2012-08-01 Chunghwa Picture Tubes Ltd Compensation circuit for a liquid crystal panel
CN103366706B (zh) * 2013-07-19 2016-03-30 深圳市华星光电技术有限公司 一种栅极驱动器的电压补偿电路和方法以及液晶显示装置
CN103730091A (zh) * 2014-01-23 2014-04-16 友达光电股份有限公司 一种像素补偿电路

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100923347B1 (ko) * 2007-02-12 2009-10-22 엘지디스플레이 주식회사 유기발광표시장치
US20120236041A1 (en) * 2011-03-14 2012-09-20 Oh Choon-Yul Active matrix display and method of driving the same
US20120249514A1 (en) * 2011-04-01 2012-10-04 Jung-Keun Ahn Organic light emitting display device, data driving apparatus for organic light emitting display device, and driving method thereof
CN103268756A (zh) * 2013-05-29 2013-08-28 上海中科高等研究院 Amoled电压外部补偿方法及系统
CN103996374A (zh) * 2014-05-12 2014-08-20 京东方科技集团股份有限公司 外部动态补偿显示屏有源区直流电压降的装置及方法

Also Published As

Publication number Publication date
CN104537985B (zh) 2017-06-30
CN104537985A (zh) 2015-04-22
US9812064B2 (en) 2017-11-07
US20170162124A1 (en) 2017-06-08

Similar Documents

Publication Publication Date Title
WO2016115752A1 (zh) 一种有机发光显示面板及其压降补偿方法
KR101382001B1 (ko) 화소 유닛 회로 및 ｏｌｅｄ 표시 장치
CN105405405B (zh) 电压降补偿方法及装置、显示装置
US10242616B2 (en) Pixel compensation circuit and active matrix organic light emitting diode display apparatus
US10276095B2 (en) Display device and method of driving display device
JP6291692B2 (ja) アクティブマトリクス表示装置およびその駆動方法
CN105139805B (zh) 一种像素驱动电路及其驱动方法、显示装置
WO2018214258A1 (zh) Oled显示装置的ovss电压降的补偿方法及像素驱动电路
KR20170042746A (ko) Amoled의 전압강하 보상방법
WO2016187919A1 (zh) 补偿amoled电压降的方法及系统
US10665171B2 (en) Method and device for compensating for image crosstalk, and display apparatus
WO2020119712A1 (zh) 显示装置的补偿方法、装置和显示设备
CN105845081A (zh) 像素电路、显示面板及驱动方法
TW200424993A (en) Electro-optical device, its driving method and electronic machine
KR20140108604A (ko) 유기 발광 표시 장치 및 그 구동 방법
US20160005354A1 (en) Display Apparatus
CN104299569A (zh) 一种阵列基板及其驱动方法、显示装置
CN109686306B (zh) 补偿因子获取方法及装置、驱动方法、显示设备
KR102024852B1 (ko) 유기 발광 표시 장치 및 그 구동 방법
CN108630147A (zh) 有源矩阵有机发光显示器及其驱动方法
TW201428720A (zh) 顯示裝置、驅動裝置、驅動方法及電子機器
CN106920516A (zh) 用于oled的补偿方法和装置、显示装置
JP6593899B2 (ja) Ｏｌｅｄ表示パネルのコントラスト比向上方法及びそのシステム
CN110767178A (zh) 一种有机发光二极管的电压补偿方法
JP2018531425A6 (ja) Ｏｌｅｄ表示パネルのコントラスト比向上方法及びそのシステム

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 15878429

Country of ref document: EP

Kind code of ref document: A1

WWE Wipo information: entry into national phase

Ref document number: 14778104

Country of ref document: US

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 15878429

Country of ref document: EP

Kind code of ref document: A1