WO2016095697A1 - 有源矩阵有机发光显示器及其控制方法 - Google Patents

有源矩阵有机发光显示器及其控制方法 Download PDF

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Publication number
WO2016095697A1
WO2016095697A1 PCT/CN2015/095918 CN2015095918W WO2016095697A1 WO 2016095697 A1 WO2016095697 A1 WO 2016095697A1 CN 2015095918 W CN2015095918 W CN 2015095918W WO 2016095697 A1 WO2016095697 A1 WO 2016095697A1
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Prior art keywords
gray scale
voltage
scale voltage
power supply
adjustment module
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PCT/CN2015/095918
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English (en)
French (fr)
Inventor
葛明伟
川岛进吾
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昆山国显光电有限公司
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Application filed by 昆山国显光电有限公司 filed Critical 昆山国显光电有限公司
Priority to US15/537,865 priority Critical patent/US10304391B2/en
Priority to JP2017532055A priority patent/JP6454016B2/ja
Priority to KR1020177019385A priority patent/KR101946503B1/ko
Priority to EP15869205.3A priority patent/EP3236461A1/en
Publication of WO2016095697A1 publication Critical patent/WO2016095697A1/zh

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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/22—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources
    • G09G3/30—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels
    • G09G3/32—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/08—Active matrix structure, i.e. with use of active elements, inclusive of non-linear two terminal elements, in the pixels together with light emitting or modulating elements
    • G09G2300/0809—Several active elements per pixel in active matrix panels
    • G09G2300/0842—Several active elements per pixel in active matrix panels forming a memory circuit, e.g. a dynamic memory with one capacitor
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/027—Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • 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
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/029—Improving the quality of display appearance by monitoring one or more pixels in the display panel, e.g. by monitoring a fixed reference pixel
    • 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
    • G09G2320/06—Adjustment of display parameters
    • G09G2320/0673—Adjustment of display parameters for control of gamma adjustment, e.g. selecting another gamma curve

Definitions

  • the present invention relates to the field of flat panel display technologies, and in particular, to an active matrix organic light emitting display and a control method thereof.
  • AMOLED Active Matrix Organic Light Emitting Display
  • TFT-LCD thin film transistor liquid crystal display
  • backlight system backlight system
  • active matrix organic light emitting displays are known as a new generation of displays that can replace thin film transistor liquid crystal displays.
  • Each pixel unit of the active matrix organic light emitting display includes a pixel circuit, and the main function of the pixel circuit is to provide a stable current for the organic light emitting diode (English name).
  • FIG. 1 for a basic structure of a pixel circuit, which is a circuit diagram of a pixel circuit in an active matrix organic light emitting display of the prior art. As shown in FIG.
  • the existing pixel circuit 10 includes: a thin film transistor (English name: Thin Film Transistor, abbreviated as TFT), an organic electroluminescent diode (English full name Organic Light Emitting Diode, OLED for short), and a storage capacitor Cs;
  • An output terminal D of the thin film transistor TFT is connected to an input end of the organic electroluminescent diode OLED, and two ends of the storage capacitor Cs are respectively connected to an input end and an output end of the organic electroluminescent diode OLED, and the pixel circuit 10
  • the pixel-side power supply positive voltage ELVdd and the pixel-side power supply negative voltage ELVss are respectively input to the first input end S of the thin film transistor TFT and the output end of the organic electroluminescent diode OLED, and the data voltage Vdata is input to the current Second of the thin film transistor TFT
  • the input terminal G, the thin film transistor TFT generates a driving current according to a voltage difference between the pixel terminal power source positive voltage E
  • the existing pixel circuit utilizes a thin film transistor as a voltage-current conversion component, and cooperates with a capacitor to store a signal to control the brightness of the organic electroluminescent diode, thereby controlling the illuminating condition and gray scale performance of the pixel.
  • the brightness of the organic electroluminescent diode is proportional to the current flowing through it, so that a normal current can be ensured as long as there is a fixed current.
  • the brightness of the organic electroluminescent diode is determined by the driving current, which is determined by the voltage difference between the pixel terminal power supply ELVdd and the data voltage Vdata.
  • An object of the present invention is to provide an active matrix organic light emitting display and a control method thereof for solving the gamma shift of the existing active matrix organic light emitting display due to the fact that the actual brightness of the organic electroluminescent diode cannot reach a predetermined brightness. problem.
  • the present invention provides an active matrix organic light emitting display, the active matrix organic light emitting display comprising: an AMOLED panel comprising a plurality of pixel circuits; and a system power chip that outputs power to the device through a power supply line a plurality of pixel circuits; and a driving chip for outputting a data voltage to the plurality of pixel circuits; wherein the driving chip is configured to detect a positive power supply voltage actually reaching the plurality of pixel circuits through a feedback trace, And based on the detected power The positive voltage compensates for the data voltage.
  • the driving chip includes a minimum gray scale voltage adjustment module for adjusting and outputting a minimum gray scale voltage; and a highest gray scale voltage adjustment module for adjusting and outputting a highest gray scale voltage; a gamma circuit coupled to the lowest gray scale voltage regulation module and the highest gray scale voltage adjustment module for generating and outputting the data voltage according to the lowest gray scale voltage and the highest gray scale voltage.
  • the data voltage output by the gamma circuit includes a voltage value corresponding to the 0th order to the 255th order of the gray scale; the lowest gray scale voltage refers to the a voltage value corresponding to the 0th order of the gray scale in the data voltage outputted by the gamma circuit, wherein the highest gray scale voltage is a voltage value corresponding to the 255th order of the gray scale in the data voltage output by the gamma circuit.
  • the driving chip further includes a detecting pin, and one end of the detecting leg is electrically connected to the plurality of pixel circuits to detect that the actual arrival is The power supply of the plurality of pixel circuits is positively connected, and the other end of the detection pin is electrically connected to the lowest gray scale voltage adjustment module and the highest gray scale voltage adjustment module for providing the detected positive power supply voltage to The lowest gray scale voltage adjustment module and the highest gray scale voltage adjustment module.
  • the driving chip further includes an operation module, the operation module and the detection pin, a minimum gray scale voltage adjustment module, and the highest gray scale voltage
  • the adjustment module is connected, and the operation module is configured to calculate a compensation value of the lowest grayscale voltage and a compensation value of the highest grayscale voltage according to the positive power supply detected by the detection pin, and the compensation value of the lowest grayscale voltage is the highest
  • the compensation values of the gray scale voltage are respectively output to the lowest gray scale voltage adjustment module and the highest gray scale voltage adjustment module, and the lowest gray scale voltage adjustment module adjusts and outputs the minimum gray according to the compensation value of the lowest gray scale voltage a step voltage, the highest gray scale voltage adjustment module adjusting and outputting the highest gray scale voltage according to the compensation value of the highest gray scale voltage.
  • the lowest gray scale voltage adjustment module and the highest gray scale voltage adjustment module are respectively provided with a minimum gray scale voltage compensation setting a compensation input terminal for determining the input end and the highest gray scale voltage, wherein the compensation value of the lowest gray scale voltage and the compensation value of the highest gray scale voltage output by the operation module respectively pass the compensation setting input terminal of the lowest gray scale voltage And the compensation setting input terminal of the highest gray scale voltage is input to the lowest gray scale voltage adjustment module and the highest gray scale voltage adjustment module.
  • the present invention also provides a control method of an active matrix organic light emitting display, and the control method of the active matrix organic light emitting display comprises:
  • the compensated data voltage is output to the plurality of pixel circuits.
  • the process of compensating for the data voltage generated by the driving chip according to the determined change of the positive power supply voltage includes:
  • the compensated data voltage is obtained according to the adjusted minimum gray scale voltage and the highest gray scale voltage.
  • the inventors have found that the reason why the actual brightness of the existing active matrix organic light emitting display is low is that the power supply trace impedance affects the positive power supply voltage actually reaching the pixel circuit, so that the difference between the positive power supply voltage and the data voltage Vdata actually reaching the pixel circuit is obtained. The value changes, causing a gamma shift.
  • the positive voltage of the power actually reaching the pixel circuit is detected by the driving chip, and the power is positively charged according to the actual power supply to the pixel circuit.
  • the minimum gray scale voltage and the highest gray scale voltage are adjusted so that the data voltage can maintain a certain difference from the positive power supply voltage actually reaching the pixel circuit, thereby eliminating the gamma shift phenomenon.
  • FIG. 1 is a circuit diagram of a pixel circuit in a prior art active matrix organic light emitting display
  • FIG. 2 is a circuit diagram of a power supply trace circuit in an active matrix organic light emitting display of the prior art
  • FIG. 3 is a schematic structural diagram of an active matrix organic light emitting display according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram showing the operation of a driving chip according to an embodiment of the present invention.
  • the present invention provides an active matrix organic light emitting display and a control method thereof in further detail with reference to the accompanying drawings and specific embodiments. Advantages and features of the present invention will be apparent from the description and appended claims. It should be noted that the drawings are in a very simplified form and all use non-precise proportions, and are only for convenience and clarity to assist the purpose of the embodiments of the present invention.
  • the actual brightness of the existing organic electroluminescent diode cannot reach a predetermined brightness, causing a gamma shift, which makes the display effect of the active matrix organic light emitting display poor.
  • the inventors conducted in-depth research and found that the reason why the organic electroluminescent diode in the existing active matrix organic light-emitting display cannot achieve the ideal brightness is that the system power chip applies a positive power supply voltage to each pixel through the power supply line. Because the power supply trace has a certain impedance, the panel current will affect the positive voltage of the power actually reaching the pixel circuit, thereby affecting the actual brightness of the organic electroluminescent diode, and thus the brightness of the pixel cannot reach the target brightness of each step of the Gamma curve. , affecting the display effect of the active matrix organic light emitting display.
  • FIG. 2 is a circuit diagram of a power trace circuit in an active matrix organic light emitting display of the prior art.
  • the power supply 11 provided by the system power supply chip is connected to the AMOLED panel 13 through a power supply line, and the power supply trace includes a power positive pressure trace and a power negative pressure trace.
  • the power source 11 applies a power source positive voltage ELVdd and a power source negative voltage ELVss to the two sides of the AMOLED panel 13 through a power positive voltage trace and a power negative voltage trace, wherein the impedance of the power supply positive voltage trace is assumed to be Rdd, the impedance of the power supply negative voltage trace is Rss. Under the influence of the impedance of the power supply line, the current I of the AMOLED panel 13 becomes small, so that the panel voltage synchronized with the current change decreases, thereby affecting the power supply positive voltage ELVdd' actually reaching the pixel circuit.
  • ELVdd' ELVdd - I ⁇ (Rdd + Rss).
  • the data voltage Vdata is the gray scale voltage of the gamma circuit output in the data driving chip.
  • the data driving chip 12 includes a gamma circuit 12a for outputting a gray scale voltage of V000 to V255, that is, a data voltage Vdata.
  • the data voltage Vdata remains unchanged when the power supply positive voltage ELVdd' actually reaching the pixel circuit changes. Therefore, the voltage difference between the power source positive voltage ELVdd' and the data voltage Vdata actually reaching the pixel circuit changes as the power source positive voltage ELVdd' actually reaches the pixel circuit. Since the voltage difference between the power supply positive voltage ELVdd' and the data voltage Vdata actually reaching the pixel circuit cannot be maintained at a constant difference, affecting the actual luminance of the organic electroluminescent diode, a gamma shift occurs.
  • the actual brightness of the existing organic electroluminescent diode cannot reach a predetermined brightness, and the gamma shift is caused by the power supply trace impedance affecting the power supply positive voltage ELVdd' actually reaching the pixel circuit, so that the actual pixel circuit is reached.
  • the voltage difference between the power supply positive voltage ELVdd' and the data voltage Vdata changes, thereby affecting the actual brightness of the organic electroluminescent diode.
  • the active matrix organic light emitting display 100 includes: a system power chip 110.
  • the AMOLED panel 130 includes a plurality of pixel circuits (not shown), and the system power chip 110 is output through the power supply line 111.
  • the power source is positively ELVdd1 to the pixel circuit, and the driving chip 120 detects the power source positive voltage ELVdd2 actually reaching the pixel circuit through the feedback trace 112, and compensates the data voltage Vdata according to the power source positive voltage ELVdd2 that actually reaches the pixel circuit.
  • the AMOLED panel 130 has a display area AA in which a plurality of pixel circuits are disposed.
  • the pixel circuit refers to a circuit included in each pixel point of the AMOLED panel 130, and the main function of the pixel circuit is to provide a stable current for the organic electroluminescent diode.
  • the pixel circuit includes an organic electroluminescent diode, a storage capacitor, and a switching transistor, and an output end of the switching transistor is connected to an input end of the organic electroluminescent diode to drive the organic electroluminescent diode.
  • the storage capacitor is connected in parallel with the organic electroluminescent diode to keep the current flowing through the organic electroluminescent diode stable, and the switching transistor uses a P-type thin film transistor.
  • the above pixel circuit is merely an example, and the configuration of the pixel circuit is not limited thereto.
  • the system power chip 110 is configured to provide positive and negative power to the pixel circuits in the display area AA. As shown in FIG. 3, the system power chip 110 is electrically connected to the pixel circuit in the display area AA through the power supply line 111, and outputs a power source positive voltage ELVdd1 to the pixel circuit. Since the power supply line 111 has a certain impedance R, the power supply positive voltage ELVdd2 actually reaching the pixel circuit is different from the power supply positive voltage ELVdd1 supplied from the system power supply chip 110.
  • the driving chip 120 is electrically connected to a pixel circuit in the display area AA through the feedback trace 112, and the feedback trace 112 inputs a power positive voltage ELVdd2 actually reaching the pixel circuit to the driving chip. 120.
  • the driving chip 120 compensates the data voltage Vdata according to the power source positive voltage ELVdd2 that actually reaches the pixel circuit.
  • the driving chip 120 includes a lowest gray scale voltage adjustment module 121, a highest gray scale voltage adjustment module 122, and a gamma circuit 123.
  • the outputs of the lowest gray scale voltage adjustment module 121 and the highest gray scale voltage adjustment module 122 are both
  • the input terminals of the gamma circuit 123 are connected, and the gamma circuit 123 is configured to generate and output gray scale voltages of V000 to V255, and the lowest gray scale voltage adjustment module 121 and the highest gray scale voltage adjustment module 122 are respectively used for adjustment.
  • the lowest gray scale voltage VREG1 and the highest gray scale voltage VGS The lowest gray scale voltage VREG1 and the highest gray scale voltage VGS.
  • the lowest gray scale voltage VREG1 refers to the V000 voltage output by the gamma circuit 123, that is, the voltage value corresponding to the 0th order (darkest state) of the gray scale.
  • the highest gray scale voltage VGS refers to the V255 voltage output by the gamma circuit 123, that is, the voltage value corresponding to the 255th order (brightest state) of the gray scale.
  • the other gray scale brightness is generated by the voltage division of the lowest order voltage VREG1 and the highest order voltage VGS as the main voltage reference.
  • the gray scale voltages V000 to V255 are also the data voltages Vdata output from the driving chip 120.
  • the driving chip 120 further includes a detecting leg 124.
  • One end of the detecting leg is electrically connected to the pixel circuit, and the other end of the detecting leg is opposite to the lowest gray scale voltage adjusting module.
  • the highest gray scale voltage regulation module is electrically connected.
  • the detecting pin 124 is connected to the pixel circuit through the feedback trace 112, and the external voltage, that is, the power supply positive voltage ELVdd2 actually reaching the pixel circuit is input to the lowest gray voltage of the driving chip 120 through the detecting pin 124.
  • the adjustment module 121 and the highest gray scale voltage adjustment module 122 are examples of the driving chip 120.
  • the driving chip 120 further includes an operation module 125, and the operation module 125 is configured to calculate a compensation value of the lowest grayscale voltage VREG1 and a compensation value of the highest grayscale voltage VGS, and the lowest grayscale voltage adjustment module.
  • 121 and the highest gray scale voltage adjustment module 122 are respectively provided with a compensation setting input terminal 206 of the lowest gray scale voltage and a compensation setting input terminal 207 of the highest gray scale voltage, and the lowest gray scale voltage VREG1 output by the operation module 125
  • the compensation value and the compensation value of the highest gray scale voltage VGS are input to the lowest gray scale voltage adjustment module 121 and the most through the compensation setting input terminal 206 of the lowest gray scale voltage and the compensation setting input terminal 207 of the highest gray scale voltage, respectively.
  • High gray scale voltage regulation module 122 is configured to calculate a compensation value of the lowest grayscale voltage VREG1 and a compensation value of the highest grayscale voltage VGS, and the lowest grayscale voltage adjustment module.
  • the output of the lowest gray scale voltage adjusting module 121 changes according to the compensation values of the external voltage ELVdd2 and the lowest gray scale voltage VREG1, and the output of the highest gray scale voltage adjusting module 122 is based on the external voltage ELVdd2 It varies with the compensation value of the highest gray scale voltage VGS.
  • the working process of the driving chip 120 includes the following steps: first, an external voltage, that is, a power supply positive voltage ELVdd2 actually reaching the pixel circuit is input to the driving chip 120 through the feedback trace 112; after that, the driving The operation module 125 in the chip 120 performs an operation according to the power supply positive voltage ELVdd2 actually reaching the pixel circuit to respectively set the compensation value of the lowest gray scale voltage VREG1 and the compensation value of the highest gray scale voltage VGS, and compensates the lowest gray scale voltage VREG1.
  • the value and the compensation value of the highest gray scale voltage VGS are input to the lowest gray scale voltage adjustment module 121 and the highest gray scale voltage adjustment module 122; then, the lowest gray scale voltage adjustment module 121 according to the compensation value of the lowest gray scale voltage VREG1 and the actual arrival pixel
  • the power supply positive voltage ELVdd2 of the circuit performs output, and the highest gray scale voltage adjustment module 122 outputs according to the compensation value of the highest gray scale voltage VGS and the power supply positive voltage ELVdd2 that actually reaches the pixel circuit; then, the gamma circuit 123 is based on the lowest
  • the output of the gray scale voltage adjustment module 121 and the highest gray scale voltage adjustment module 122 generates an adjusted gray scale voltage V000 V255, i.e., the data voltage Vdata.
  • the driving chip 120 can not only provide the data voltage Vdata for the pixel circuit, but also can detect the power supply positive voltage ELVdd2 that actually reaches the pixel circuit, and automatically adjust according to the power supply positive voltage ELVdd2 of the pixel circuit. Data voltage Vdata.
  • the lowest gray scale voltage adjustment module inside the driving chip 120 is maintained in order to keep the difference between the power supply positive voltage ELVdd2 and the data voltage Vdata that actually reaches the pixel circuit unchanged.
  • the highest gray scale voltage adjustment module 122 automatically increase or decrease the minimum gray scale voltage and the highest gray scale voltage according to the compensation value to ensure that the difference between the power source positive voltage ELVdd2 and the data voltage Vdata that actually reaches the pixel circuit can be maintained. Change, thereby eliminating gamma Offset.
  • the driving chip 120 can directly fix the IC on the glass by COG (Chip On Glass), or can fix the IC on the flexible circuit board by COF (English full name Chip On FPC), through the flexible circuit board and The AMOLED panel 130 is connected.
  • COG Chip On Glass
  • COF Edinburgh full name Chip On FPC
  • the embodiment further provides a control method of an active matrix organic light emitting display.
  • the control method of the active matrix organic light emitting display includes the following steps:
  • the system power supply chip 110 is used to supply the power supply positive voltage ELVdd1 to the pixel circuit.
  • the driving chip 120 detects the power supply positive voltage ELVdd2 actually reaching the pixel circuit.
  • the data voltage Vdata is compensated based on the change in the power source positive voltage ELVdd2 that actually reaches the pixel circuit.
  • the specific process of compensating the data voltage Vdata according to the change of the power source positive voltage ELVdd2 actually reaching the pixel circuit includes: setting the compensation value of the lowest gray scale voltage VREG1 and the highest gray scale voltage VGS according to the power source positive voltage ELVdd2 actually reaching the pixel circuit.
  • the compensation value is adjusted according to the compensation value of the lowest gray scale voltage VREG1 and the power supply positive voltage ELVdd2 actually reaching the pixel circuit
  • the highest gray scale voltage is adjusted according to the compensation value of the highest gray scale voltage VGS and the power supply positive voltage ELVdd2 actually reaching the pixel circuit.
  • Gray scale voltage; the data voltage Vdata is adjusted according to the lowest gray scale voltage and the highest gray scale voltage to obtain the compensated data voltage Vdata.
  • the compensated data voltage Vdata is output to the pixel circuit.
  • the active matrix organic light emitting display and the control method thereof provided by the present invention press the driving chip to detect the positive power supply voltage actually reaching the pixel circuit, and automatically adjust the minimum gray scale voltage according to the positive power supply voltage of the pixel circuit actually reaching the pixel circuit. And the highest gray scale voltage, and then the data voltage is compensated, so that the data voltage can maintain a certain difference from the positive voltage of the power actually reaching the pixel circuit, thereby eliminating the gamma shift phenomenon.

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

一种有源矩阵有机发光显示器（100）及其控制方法。有源矩阵有机发光显示器（100）包括系统电源芯片（110）、驱动芯片（120）、AMOLED面板（130）、电源走线（111）和反馈走线（112）。AMOLED面板（130）包括多个像素电路。系统电源芯片（110）通过电源走线（111）输出电源正压（ELVdd1）至像素电路，驱动芯片（120）通过反馈走线（112）侦测实际到达像素电路的电源正压（ELVdd2），并根据实际到达像素电路的电源正压（ELVdd2）对数据电压（Vdata）进行补偿。通过驱动芯片（120）侦测实际到达像素电路的电源正压（ELVdd2），并根据实际到达像素电路的电源正压（ELVdd2）自动调节最低灰阶电压（VREG1）和最高灰阶电压（VGS），使得数据电压（Vdata）与实际到达像素电路的电源正压（ELVdd2）能够保持一定的差值，从而消除伽马偏移现象。

Description

有源矩阵有机发光显示器及其控制方法 技术领域
本发明涉及平板显示技术领域，特别涉及一种有源矩阵有机发光显示器及其控制方法。
背景技术
有源矩阵有机发光显示器(英文全称Active Matrix Organic Light Emitting Display，简称AMOLED)能够自行发光，不像薄膜晶体管液晶显示器(英文全称Thin Film Transistor liquid crystal display，简称TFT-LCD)需要背光系统(backlight system)才能点亮，因此可视度和亮度均更高，而且更轻薄。目前，有源矩阵有机发光显示器被誉为可以取代薄膜晶体管液晶显示器的新一代显示器。
有源矩阵有机发光显示器的每个像素单元均包括一像素电路，所述像素电路的主要作用是为有机电致发光二极管(英文全称Organic Light Emitting Diode，简称OLED)提供一个稳定的电流。像素电路的基本结构请参考图1，其为现有技术的有源矩阵有机发光显示器中像素电路的电路图。如图1所示，现有的像素电路10包括：薄膜晶体管(英文全称Thin Film Transistor，简称TFT)、有机电致发光二极管(英文全称Organic Light Emitting Diode，简称OLED)和储存电容Cs；所述薄膜晶体管TFT的输出端D与有机电致发光二极管OLED的输入端相连，所述储存电容Cs的两端分别与所述有机电致发光二极管OLED的输入端和输出端相连，所述像素电路10工作时像素端电源正压ELVdd和像素端电源负压ELVss分别输入至所述薄膜晶体管TFT的第一输入端S和所述有机电致发光二极管OLED的输出端，此时数据电压Vdata输入至所述薄膜晶体管TFT的第二 输入端G，所述薄膜晶体管TFT根据像素端电源正压ELVdd和数据电压Vdata之间的电压差产生一驱动电流，所述驱动电流用以驱动所述有机电致发光二极管OLED发光，所述储存电容Cs用以稳定流经所述有机电致发光二极管的电流。
由此可见，现有的像素电路利用薄膜晶体管作为电压-电流转换的元件，并搭配电容存储信号以控制有机电致发光二极管的亮度，从而控制像素的发光情况和灰阶表现。其中，所述有机电致发光二极管的亮度与流过它的电流成正比，因此只要有固定的电流即可保证其正常发光。有机电致发光二极管的亮度决定于驱动电流，而驱动电流是由像素端电源正压ELVdd和数据电压Vdata的电压差决定的。
然而，在实际应用中发现有源矩阵有机发光显示器中有机电致发光二极管的实际亮度无法达到预定亮度，造成伽马(Gamma)偏移现象，影响显示效果。为了提高有源矩阵有机发光显示器的显示效果，本领域技术人员一直在寻找导致有源矩阵有机发光显示器出现伽马偏移的原因以及其解决方法。
发明内容
本发明的目的在于提供一种有源矩阵有机发光显示器及其控制方法，以解决现有的有源矩阵有机发光显示器因有机电致发光二极管的实际亮度无法达到预定亮度而造成伽马偏移的问题。
为解决上述问题，本发明提供一种有源矩阵有机发光显示器，所述有源矩阵有机发光显示器包括：AMOLED面板，包括多个像素电路；系统电源芯片，通过电源走线输出电源正压至所述多个像素电路；以及驱动芯片，用于向所述多个像素电路输出数据电压；其中，所述驱动芯片用于通过反馈走线侦测实际到达所述多个像素电路的电源正压，并根据侦测到的电源 正压对所述数据电压进行补偿。
可选的，在所述的有源矩阵有机发光显示器中，所述驱动芯片包括最低灰阶电压调节模块，用于调节并输出最低灰阶电压；最高灰阶电压调节模块，用于调节并输出最高灰阶电压；伽马电路，与所述最低灰阶电压调节模块和最高灰阶电压调节模块相连，用于根据所述最低灰阶电压和最高灰阶电压产生和输出所述数据电压。
可选的，在所述的有源矩阵有机发光显示器中，所述伽马电路输出的数据电压包括灰阶第0阶至第255阶对应的电压值；所述最低灰阶电压是指所述伽马电路输出的数据电压中灰阶第0阶对应的电压值，所述最高灰阶电压是指所述伽马电路输出的数据电压中灰阶第255阶对应的电压值。
可选的，在所述的有源矩阵有机发光显示器中，所述驱动芯片还包括一侦测脚，所述侦测脚的一端与所述多个像素电路电连接以侦测实际到达所述多个像素电路的电源正压，所述侦测脚的另一端与所述最低灰阶电压调节模块和所述最高灰阶电压调节模块电连接，用于将侦测到的电源正压提供给所述最低灰阶电压调节模块和所述最高灰阶电压调节模块。
可选的，在所述的有源矩阵有机发光显示器中，所述驱动芯片还包括一运算模块，所述运算模块与所述侦测脚、最低灰阶电压调节模块和所述最高灰阶电压调节模块相连，所述运算模块用于根据侦测脚侦测到的电源正压计算最低灰阶电压的补偿值和最高灰阶电压的补偿值并将所述最低灰阶电压的补偿值和最高灰阶电压的补偿值分别输出至所述最低灰阶电压调节模块和最高灰阶电压调节模块，所述最低灰阶电压调节模块根据所述最低灰阶电压的补偿值调节并输出所述最低灰阶电压，所述最高灰阶电压调节模块根据所述最高灰阶电压的补偿值调节并输出所述最高灰阶电压。
可选的，在所述的有源矩阵有机发光显示器中，所述最低灰阶电压调节模块和所述最高灰阶电压调节模块上分别设置有最低灰阶电压的补偿设 定输入端和最高灰阶电压的补偿设定输入端，所述运算模块输出的最低灰阶电压的补偿值和最高灰阶电压的补偿值分别通过所述最低灰阶电压的补偿设定输入端和所述最高灰阶电压的补偿设定输入端输入至最低灰阶电压调节模块和最高灰阶电压调节模块。
相应的，本发明还提供了一种有源矩阵有机发光显示器的控制方法，所述有源矩阵有机发光显示器的控制方法包括：
利用系统电源芯片为多个像素电路提供电源正压；
利用驱动芯片侦测实际到达所述多个像素电路的电源正压；
判断实际到达所述多个像素电路的电源正压是增大还是减小；
根据判断出的电源正压的变化对驱动芯片产生的数据电压进行补偿；以及
将补偿后的数据电压输出至所述多个像素电路。
可选的，在所述的有源矩阵有机发光显示器的控制方法中，根据判断出的电源正压的变化对驱动芯片产生的数据电压进行补偿的过程包括：
根据实际到达所述多个像素电路的电源正压分别设定最低灰阶电压的补偿值和最高灰阶电压的补偿值；
根据最低灰阶电压的补偿值和实际到达所述多个像素电路的电源正压调节最低灰阶电压，同时根据最高灰阶电压的补偿值和实际到达所述多个像素电路的电源正压调节最高灰阶电压；
根据调节后的最低灰阶电压和最高灰阶电压得到补偿后的数据电压。
发明人发现，造成现有的有源矩阵有机发光显示器实际亮度低的原因在于，电源走线阻抗影响实际到达像素电路的电源正压，使得实际到达像素电路的电源正压与数据电压Vdata的差值出现变化，造成伽马偏移。在本发明提供的有源矩阵有机发光显示器及其控制方法中，通过驱动芯片侦测实际到达像素电路的电源正压，并根据实际到达像素电路的电源正压自动 调节最低灰阶电压和最高灰阶电压，使得数据电压与实际到达像素电路的电源正压能够保持一定的差值，从而消除伽马偏移现象。
附图说明
图1是现有技术的有源矩阵有机发光显示器中像素电路的电路图；
图2是现有技术的有源矩阵有机发光显示器中电源走线回路的电路图；
图3是本发明实施例的有源矩阵有机发光显示器的结构示意图；
图4是本发明实施例的驱动芯片的工作原理图。
具体实施方式
以下结合附图和具体实施例对本发明提出一种有源矩阵有机发光显示器及其控制方法作进一步详细说明。根据下面说明和权利要求书，本发明的优点和特征将更清楚。需说明的是，附图均采用非常简化的形式且均使用非精准的比例，仅用以方便、明晰地辅助说明本发明实施例的目的。
现有的有机电致发光二极管的实际亮度无法达到预定亮度，造成伽马偏移，使得有源矩阵有机发光显示器的显示效果差。发明人对此进行了深入的研究，发现造成现有的有源矩阵有机发光显示器中有机电致发光二极管无法达到理想亮度的原因在于，系统电源芯片通过电源走线对各个像素施加电源正压时，由于电源走线存在一定的阻抗，面板电流会影响实际到达像素电路的电源正压，从而对有机电致发光二极管的实际亮度造成影响，进而导致像素的亮度无法达到Gamma曲线各阶的目标亮度，影响有源矩阵有机发光显示器的显示效果。
请参考图2，其为现有技术的有源矩阵有机发光显示器中电源走线回路的电路图。如图2所示，系统电源芯片提供的电源11通过电源走线与AMOLED面板13连接，所述电源走线包括电源正压走线和电源负压走线， 所述电源11通过电源正压走线和电源负压走线对所述AMOLED面板13的两侧分别施加电源正压ELVdd和电源负压ELVss，其中，假设所述电源正压走线的阻抗为Rdd，所述电源负压走线的阻抗为Rss。受到电源走线阻抗的影响，所述AMOLED面板13的电流I变小，使得与该电流变化同步的面板电压出现下降，进而影响实际到达像素电路的电源正压ELVdd’。
其中，实际到达像素电路的电源正压ELVdd’的计算公式为：
ELVdd’＝ELVdd–I×(Rdd+Rss)。
可见，当AMOLED面板13的电流I上升时实际到达像素电路的电源正压ELVdd’减小，当AMOLED面板13的电流I下降时实际到达像素电路的电源正压ELVdd’增大。
而数据电压Vdata是数据驱动芯片中的伽马电路输出的灰阶电压。请继续参考图2，所述数据驱动芯片12包括一伽马电路12a，所述伽马电路12a用于输出V000至V255的灰阶电压，即数据电压Vdata。所述数据电压Vdata在实际到达像素电路的电源正压ELVdd’出现变化时保持不变。因此，实际到达像素电路的电源正压ELVdd’和数据电压Vdata的电压差会随着实际到达像素电路的电源正压ELVdd’的变化而变化。由于实际到达像素电路的电源正压ELVdd’和数据电压Vdata的电压差不能维持在一个恒定的差值，影响有机电致发光二极管的实际亮度，故而出现伽马偏移。
综上，造成现有的有机电致发光二极管的实际亮度无法达到预定亮度，造成伽马偏移的原因在于，电源走线阻抗影响实际到达像素电路的电源正压ELVdd’，使得实际到达像素电路的电源正压ELVdd’和数据电压Vdata的电压差出现变化，进而影响有机电致发光二极管的实际亮度。为了解决上述问题，本申请提出了如下技术方案：
请参考图3，其为本发明实施例的有源矩阵有机发光显示器的结构示意图。如图3所示，所述有源矩阵有机发光显示器100包括：系统电源芯片 110、驱动芯片120、AMOLED面板130、电源走线111和反馈走线112；所述AMOLED面板130包括多个像素电路(图中未示出)，所述系统电源芯片110通过电源走线111输出电源正压ELVdd1至所述像素电路，所述驱动芯片120通过反馈走线112侦测实际到达像素电路的电源正压ELVdd2，并根据实际到达像素电路的电源正压ELVdd2对数据电压Vdata进行补偿。
具体的，AMOLED面板130具有一显示区域AA，所述显示区域AA中设置有多个像素电路。所述像素电路是指包含于AMOLED面板130中每一像素点的电路，所述像素电路的主要作用是为有机电致发光二极管提供一个稳定的电流。本实施例中，所述像素电路包括有机电致发光二极管、储存电容和开关晶体管，所述开关晶体管的输出端与有机电致发光二极管的输入端连接，用以驱动所述有机电致发光二极管发光，所述储存电容与有机电致发光二极管并联用以保持流经有机电致发光二极管的电流稳定，所述开关晶体管采用P型薄膜晶体管。
需要说明的是，上述像素电路仅为示例，像素电路的结构不限于此。
其中，所述系统电源芯片110用于向显示区域AA内的像素电路提供正负电源。如图3所示，所述系统电源芯片110通过所述电源走线111与显示区域AA内的像素电路电性连接，并输出电源正压ELVdd1至所述像素电路。由于电源走线111具有一定的阻抗R，实际到达像素电路的电源正压ELVdd2与所述系统电源芯片110提供的电源正压ELVdd1存在差异。
为此，需要侦测实际到达像素电路的电源正压ELVdd2。如图3所示，所述驱动芯片120通过所述反馈走线112与显示区域AA内的像素电路电性连接，所述反馈走线112将实际到达像素电路的电源正压ELVdd2输入至驱动芯片120，所述驱动芯片120根据实际到达像素电路的电源正压ELVdd2对数据电压Vdata进行补偿。
请参考图4，其为本发明实施例的驱动芯片的工作原理图。如图4所示， 所述驱动芯片120包括最低灰阶电压调节模块121、最高灰阶电压调节模块122和伽马电路123，所述最低灰阶电压调节模块121和最高灰阶电压调节模块122的输出端均与所述伽马电路123的输入端相连，所述伽马电路123用于产生和输出V000至V255的灰阶电压，所述最低灰阶电压调节模块121和最高灰阶电压调节模块122分别用于调节最低灰阶电压VREG1和最高灰阶电压VGS。
其中，最低灰阶电压VREG1是指伽马电路123输出的V000电压，即是灰阶第0阶(最暗状态)对应的电压值。最高灰阶电压VGS是指伽马电路123输出的V255电压，即是灰阶第255阶(最亮状态)对应的电压值。其他灰阶亮度是以最低阶电压VREG1和最高阶电压VGS作为主要电压参考，通过电阻分压产生的。灰阶电压V000到V255也是驱动芯片120输出的数据电压Vdata。
请继续参考图4，所述驱动芯片120还包括一侦测脚124，所述侦测脚的一端与像素电路电连接，所述侦测脚的另一端与所述最低灰阶电压调节模块和所述最高灰阶电压调节模块电连接。具体地，所述侦测脚124通过所述反馈走线112与像素电路连接，外部电压即实际到达像素电路的电源正压ELVdd2通过所述侦测脚124输入至驱动芯片120的最低灰阶电压调节模块121和最高灰阶电压调节模块122。
请继续参考图4，所述驱动芯片120还包括一运算模块125，所述运算模块125用于计算最低灰阶电压VREG1的补偿值和最高灰阶电压VGS的补偿值，最低灰阶电压调节模块121和最高灰阶电压调节模块122上分别设置有最低灰阶电压的补偿设定输入端206和最高灰阶电压的补偿设定输入端207，所述运算模块125输出的最低灰阶电压VREG1的补偿值和最高灰阶电压VGS的补偿值分别通过最低灰阶电压的补偿设定输入端206和最高灰阶电压的补偿设定输入端207输入至最低灰阶电压调节模块121和最 高灰阶电压调节模块122。
在所述驱动芯片120中，所述最低灰阶电压调节模块121的输出根据外部电压ELVdd2和最低灰阶电压VREG1的补偿值而变化，所述最高灰阶电压调节模块122的输出根据外部电压ELVdd2和最高灰阶电压VGS的补偿值而变化。
请继续参考图4，所述驱动芯片120的工作过程包括以下步骤：首先，外部电压即实际到达像素电路的电源正压ELVdd2通过所述反馈走线112输入至驱动芯片120；之后，所述驱动芯片120中的运算模块125根据实际到达像素电路的电源正压ELVdd2进行运算以分别设定最低灰阶电压VREG1的补偿值和最高灰阶电压VGS的补偿值，并将最低灰阶电压VREG1的补偿值和最高灰阶电压VGS的补偿值输入至最低灰阶电压调节模块121和最高灰阶电压调节模块122；接着，最低灰阶电压调节模块121根据最低灰阶电压VREG1的补偿值和实际到达像素电路的电源正压ELVdd2进行输出，所述最高灰阶电压调节模块122根据最高灰阶电压VGS的补偿值和实际到达像素电路的电源正压ELVdd2进行输出；然后，所述伽马电路123根据最低灰阶电压调节模块121和最高灰阶电压调节模块122的输出生成调整后的灰阶电压V000到V255，即数据电压Vdata。
在本实施例中，所述驱动芯片120不但能够为所述像素电路提供数据电压Vdata，而且能够侦测实际达到像素电路的电源正压ELVdd2，并根据实际达到像素电路的电源正压ELVdd2自动调整数据电压Vdata。当实际到达像素电路的电源正压ELVdd2增大或减小时，为了保持实际到达像素电路的电源正压ELVdd2和数据电压Vdata的差值不变，所述驱动芯片120内部的最低灰阶电压调节模块121和最高灰阶电压调节模块122会自动按照补偿值增大或减小最低灰阶电压和最高灰阶电压，以保证实际到达像素电路的电源正压ELVdd2和数据电压Vdata差值的能够维持不变，从而消除伽马 偏移。
所述驱动芯片120可以通过COG(英文全称Chip On Glass)方式直接将IC固定于玻璃上，也可以通过COF(英文全称Chip On FPC)方式将IC固定于柔性线路板上，通过柔性线路板与AMOLED面板130连接。
相应的，本实施例还提供了一种有源矩阵有机发光显示器的控制方法。请继续参考图3，所述有源矩阵有机发光显示器的控制方法包括以下步骤：
S10：利用系统电源芯片110为像素电路提供电源正压ELVdd1；
S11：利用驱动芯片120侦测实际到达像素电路的电源正压ELVdd2；
S12：判断实际到达像素电路的电源正压ELVdd2是增大还是减小；
S13：根据实际到达像素电路的电源正压ELVdd2的变化对数据电压Vdata进行补偿；
S14：将补偿后的数据电压Vdata输出至像素电路。
具体的，首先，利用系统电源芯片110为像素电路提供电源正压ELVdd1。
接着，利用驱动芯片120侦测实际到达像素电路的电源正压ELVdd2。
之后，判断实际到达像素电路的电源正压ELVdd2是增大还是减小。
然后，根据实际到达像素电路的电源正压ELVdd2的变化对数据电压Vdata进行补偿。
根据实际到达像素电路的电源正压ELVdd2的变化对数据电压Vdata进行补偿的具体过程包括：根据实际到达像素电路的电源正压ELVdd2分别设定最低灰阶电压VREG1的补偿值和最高灰阶电压VGS的补偿值；根据最低灰阶电压VREG1的补偿值和实际到达像素电路的电源正压ELVdd2调节最低灰阶电压，根据最高灰阶电压VGS的补偿值和实际到达像素电路的电源正压ELVdd2调节最高灰阶电压；根据最低灰阶电压和最高灰阶电压对数据电压Vdata进行调节，得到补偿后的数据电压Vdata。
最后，将补偿后的数据电压Vdata输出至像素电路。
综上，本发明提供的有源矩阵有机发光显示器及其控制方法压中，通过驱动芯片侦测实际到达像素电路的电源正压，并根据实际到达像素电路的电源正压自动调节最低灰阶电压和最高灰阶电压，进而对数据电压进行补偿，使得数据电压与实际到达像素电路的电源正压能够保持一定的差值，从而消除伽马偏移现象。
上述描述仅是对本发明较佳实施例的描述，并非对本发明范围的任何限定，本发明领域的普通技术人员根据上述揭示内容做的任何变更、修饰，均属于权利要求书的保护范围。

Claims (8)

  1. 一种有源矩阵有机发光显示器，其特征在于，包括：
    AMOLED面板，包括多个像素电路；
    系统电源芯片，通过电源走线输出电源正压至所述多个像素电路；以及
    驱动芯片，用于向所述多个像素电路输出数据电压；
    其中，所述驱动芯片用于通过反馈走线侦测实际到达所述多个像素电路的电源正压，并根据侦测到的电源正压对所述数据电压进行补偿。
  2. 如权利要求1所述的有源矩阵有机发光显示器，其特征在于，所述驱动芯片包括：
    最低灰阶电压调节模块，用于调节并输出最低灰阶电压；
    最高灰阶电压调节模块，用于调节并输出最高灰阶电压；
    伽马电路，与所述最低灰阶电压调节模块和最高灰阶电压调节模块相连，用于根据所述最低灰阶电压和最高灰阶电压产生和输出所述数据电压。
  3. 如权利要求2所述的有源矩阵有机发光显示器，其特征在于，所述伽马电路输出的数据电压包括灰阶第0阶至第255阶对应的电压值；所述最低灰阶电压是指所述伽马电路输出的数据电压中灰阶第0阶对应的电压值，所述最高灰阶电压是指所述伽马电路输出的数据电压中灰阶第255阶对应的电压值。
  4. 如权利要求2所述的有源矩阵有机发光显示器，其特征在于，所述驱动芯片还包括一侦测脚，所述侦测脚的一端与所述多个像素电路电连接以侦测实际到达所述多个像素电路的电源正压，所述侦测脚的另一端与所述最低灰阶电压调节模块和所述最高灰阶电压调节模块电连接，用于将侦测到的电源正压提供给所述最低灰阶电压调节模块和所述最高灰阶电压调 节模块。
  5. 如权利要求4所述的有源矩阵有机发光显示器，其特征在于，所述驱动芯片还包括一运算模块，所述运算模块与所述侦测脚、最低灰阶电压调节模块和所述最高灰阶电压调节模块相连，所述运算模块用于根据侦测脚侦测到的电源正压计算最低灰阶电压的补偿值和最高灰阶电压的补偿值并将所述最低灰阶电压的补偿值和最高灰阶电压的补偿值分别输出至所述最低灰阶电压调节模块和最高灰阶电压调节模块，所述最低灰阶电压调节模块根据所述最低灰阶电压的补偿值调节并输出所述最低灰阶电压，所述最高灰阶电压调节模块根据所述最高灰阶电压的补偿值调节并输出所述最高灰阶电压。
  6. 如权利要求5所述的有源矩阵有机发光显示器，其特征在于，所述最低灰阶电压调节模块和所述最高灰阶电压调节模块上分别设置有最低灰阶电压的补偿设定输入端和最高灰阶电压的补偿设定输入端，所述运算模块输出的最低灰阶电压的补偿值和最高灰阶电压的补偿值分别通过所述最低灰阶电压的补偿设定输入端和所述最高灰阶电压的补偿设定输入端输入至最低灰阶电压调节模块和最高灰阶电压调节模块。
  7. 一种有源矩阵有机发光显示器的控制方法，其特征在于，包括：
    利用系统电源芯片为多个像素电路提供电源正压；
    利用驱动芯片侦测实际到达所述多个像素电路的电源正压；
    判断实际到达所述多个像素电路的电源正压是增大还是减小；
    根据判断出的电源正压的变化对驱动芯片产生的数据电压进行补偿；以及
    将补偿后的数据电压输出至所述多个像素电路。
  8. 如权利要求7所述的有源矩阵有机发光显示器的控制方法，其特征在于，根据判断出的电源正压的变化对驱动芯片产生的数据电压进行补偿 的过程包括：
    根据实际到达所述多个像素电路的电源正压分别设定最低灰阶电压的补偿值和最高灰阶电压的补偿值；
    根据最低灰阶电压的补偿值和实际到达所述多个像素电路的电源正压调节最低灰阶电压，同时根据最高灰阶电压的补偿值和实际到达所述多个像素电路的电源正压调节最高灰阶电压；
    根据调节后的最低灰阶电压和最高灰阶电压得到补偿后的数据电压。
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CN104464627A (zh) 2015-03-25
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EP3236461A4 (en) 2017-10-25
US10304391B2 (en) 2019-05-28
JP2018502323A (ja) 2018-01-25
KR20170097109A (ko) 2017-08-25
US20180005587A1 (en) 2018-01-04
TW201633281A (zh) 2016-09-16
KR101946503B1 (ko) 2019-02-11
EP3236461A1 (en) 2017-10-25

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