WO2016101772A1 - 驱动芯片的Gamma电压调整电路和方法以及AMOLED显示器 - Google Patents

驱动芯片的Gamma电压调整电路和方法以及AMOLED显示器 Download PDF

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Publication number
WO2016101772A1
WO2016101772A1 PCT/CN2015/096087 CN2015096087W WO2016101772A1 WO 2016101772 A1 WO2016101772 A1 WO 2016101772A1 CN 2015096087 W CN2015096087 W CN 2015096087W WO 2016101772 A1 WO2016101772 A1 WO 2016101772A1
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Prior art keywords
voltage
gamma
unit
adjustment
driving chip
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PCT/CN2015/096087
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English (en)
French (fr)
Inventor
王龙
川岛进吾
朱修剑
葛明伟
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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 JP2017533520A priority Critical patent/JP2018509641A/ja
Priority to KR1020177020259A priority patent/KR20170097175A/ko
Priority to EP15871841.1A priority patent/EP3239970A4/en
Publication of WO2016101772A1 publication Critical patent/WO2016101772A1/zh
Priority to US15/539,589 priority patent/US20180268759A1/en

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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
    • G09G3/3258—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 voltage across 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]
    • G09G3/3225—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]
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/14—Picture signal circuitry for video frequency region
    • H04N5/20—Circuitry for controlling amplitude response
    • H04N5/202—Gamma control
    • 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
    • G09G2300/0828—Several active elements per pixel in active matrix panels forming a digital to analog [D/A] conversion circuit
    • 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
    • G09G2320/0233—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
    • G09G2320/06—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, and in particular to a Gamma voltage adjustment circuit and method for driving a chip and an active array organic light emitting display.
  • An active array organic light emitting display is an active light emitting device. Compared with the current mainstream flat panel display technology thin film transistor liquid crystal display (TFT-LCD), AMOLED display has the advantages of high contrast, wide viewing angle, low power consumption and thinner thickness.
  • the AMOLED display includes a display area 1 and a non-display area 2 surrounding the display area 1.
  • a display area 1 In the display area 1, a plurality of regularly arranged pixel units 3 are disposed.
  • a driver chip (Driver IC) 4 for supplying a driving signal to the pixel unit 3 is disposed on the non-display area 2.
  • the illumination of the AMOLED display requires two supply voltages, ELVDD and ELVSS, which are provided by a power chip 5.
  • ELVDD may change.
  • the pixel circuit includes a first thin film transistor T1, a second thin film transistor T2, a capacitor C, and a light emitting diode OLED.
  • the brightness of the OLED is controlled by the current through the OLED.
  • the second thin film transistor T2 is connected between the power supply voltage ELVDD and the anode of the OLED
  • the capacitor C is connected between the gate of the second thin film transistor T2 and the ELVDD
  • the cathode of the OLED is connected to the power supply voltage ELVSS
  • the first thin film transistor T1 is connected between the data line DL and the gate of the second thin film transistor T2
  • the gate of the first thin film transistor T1 is connected to the scan line SL
  • the scan signal transmitted by the scan line SL controls the on and off of the first thin film transistor T1.
  • the signal voltage generated by the driving chip 4 (ie, The Gamma voltage displayed under different gray scales is transmitted to the pixel circuit through the data line DL, and is applied to the gate of the second thin film transistor T2 through the first thin film transistor T1.
  • the magnitude of the current flowing through the OLED is determined by the voltage difference of the signal voltages transmitted by the power supply voltages ELVDD and DL, that is, the brightness of the OLED is controlled by the power supply voltage ELVDD and the Gamma voltage output by the driving chip 4. .
  • the fluctuation of ELVDD directly affects the current passing through the OLED, thereby affecting the brightness of the LED OLED.
  • the variation of ELVDD causes the brightness of the display to change or the display effect of each area is inconsistent.
  • the present invention provides a Gamma voltage adjustment circuit for driving a chip, the circuit including an analog-to-digital conversion unit, a logic determination unit, a voltage adjustment unit, and a gamma generation unit; the analog-to-digital conversion unit will drive the drive chip
  • the input voltage is converted into a digital signal and transmitted to the logic determining unit; the logic determining unit determines a change of the input voltage according to the digital signal, and generates an adjustment signal according to the change to be transmitted to the voltage adjusting unit
  • the voltage adjustment unit generates a corresponding adjustment voltage according to the adjustment signal, and transmits the corresponding adjustment voltage to the gamma generation unit; the gamma generation unit adjusts the output gamma voltage according to the adjustment voltage.
  • the input voltage is an ELVDD supply voltage.
  • the circuit further includes a filtering unit configured to filter noise in an input voltage of the driving chip, and transmit the filtered input voltage to the analog to digital conversion unit.
  • a filtering unit configured to filter noise in an input voltage of the driving chip, and transmit the filtered input voltage to the analog to digital conversion unit.
  • the present invention also provides a Gamma voltage adjustment method for a driving chip, the method comprising:
  • the logic determining unit determines a change of the input voltage according to the digital signal, and generates an adjustment signal according to the change to be transmitted to the voltage adjusting unit;
  • the voltage adjustment unit generates a corresponding adjustment voltage according to the adjustment signal, and transmits the same to the gamma generating unit;
  • the gamma generating unit adjusts the output gamma voltage according to the adjustment voltage.
  • the input voltage is an ELVDD supply voltage.
  • the filtering unit before the converting the input voltage by the analog-to-digital conversion unit, the filtering unit further filters the noise in the input voltage of the driving chip, and transmits the filtered input voltage to the analog-to-digital conversion unit.
  • an AMOLED display comprising:
  • the driving chip for providing a driving signal to the display panel, the driving chip being mounted on the display panel, the driving chip comprising a Gamma voltage adjusting circuit of the driving chip described above.
  • the input voltage is an ELVDD supply voltage.
  • the display panel includes a display area and a non-display area surrounding the display area, where the display area is provided with a plurality of pixel units, and the ELVDD power supply line is used to provide ELVDD to the plurality of pixel units by using a power supply chip. voltage.
  • the driving chip is connected to the ELVDD power line in a non-display area of the display panel.
  • the Gamma voltage adjustment circuit, the Gamma voltage adjustment method and the AMOLED display of the driving chip provided by the present invention have the following beneficial effects:
  • the present invention sets an analog-to-digital conversion unit in a Gamma voltage adjustment circuit of a driver chip, a logic determining unit, a voltage adjusting unit, and a gamma generating unit; the analog-to-digital converting unit converting a voltage signal of the driving chip input voltage into a digital signal, and transmitting the signal to the logic determining unit; the logic determining unit according to the The digital signal determines a change of the input voltage, and generates an adjustment signal to be transmitted to the voltage adjustment unit; the voltage adjustment unit generates a corresponding adjustment voltage and transmits to the gamma generation unit; the gamma generation unit is configured according to the adjustment voltage Adjusting the Gamma voltage reduces the effects of changes in the input voltage;
  • the present invention connects the driving chip in the AMOLED display to the ELVDD power supply line, so that the ELVDD power supply voltage is input to the driving chip, and the change of the ELVDD power supply voltage is transmitted to the Gamma generating unit through the Gamma voltage adjusting circuit of the driving chip, and the Gamma generating unit
  • the Gamma voltage is adjusted to offset the change of the ELVDD power supply voltage, which solves the phenomenon that the display brightness is changed due to the ELVDD power supply voltage variation and the display effect of each display area is uneven, thereby improving the display quality.
  • FIG. 1 is a schematic structural view of a conventional AMOLED display.
  • FIG. 2 is a schematic diagram showing the structure of a pixel circuit in a conventional AMOLED display.
  • FIG. 3 is a schematic structural diagram of a Gamma voltage adjustment circuit of a driving chip according to an embodiment of the present invention.
  • FIG. 4 is a flowchart of a method for adjusting a gamma voltage of a driving chip according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of an AMOLED display according to an embodiment of the present invention.
  • the core idea of the present invention is to provide an analog-to-digital conversion unit, a logic determination unit, a voltage adjustment unit, and a gamma generation unit in a Gamma voltage adjustment circuit of a driver chip;
  • the analog-to-digital conversion unit inputs a voltage signal of the input voltage of the driver chip Converting to a digital signal and transmitting to the logic determining unit;
  • the logic determining unit determines a change of the input voltage according to the digital signal, and generates an adjustment signal to be transmitted to the voltage adjusting unit;
  • the voltage adjusting unit generates a corresponding The voltage is adjusted and transmitted to the gamma generating unit;
  • the gamma generating unit adjusts the gamma voltage according to the regulated voltage, reducing an influence due to a change in the input voltage.
  • FIG. 3 is a schematic structural diagram of a Gamma voltage adjustment circuit of a driving chip according to Embodiment 1 of the present invention.
  • the Gamma voltage adjustment circuit of the driving chip includes: an analog-to-digital conversion unit 12, a logic determination unit 13, a voltage adjustment unit 14, and a gamma generation unit 15; the analog-to-digital conversion unit 12 will drive the drive chip
  • the voltage signal of the input voltage is converted into a digital signal, and is sent to the logic determining unit 13;
  • the logic determining unit 13 determines the change of the input voltage according to the digital signal, and generates an adjustment signal to the voltage adjusting unit 14;
  • the voltage adjustment unit 14 generates a corresponding adjustment voltage and transmits it to the gamma generation unit 15; the gamma generation unit 15 adjusts the output gamma voltage according to the adjustment voltage.
  • the gamma voltage adjustment circuit of the driving chip further includes a filtering unit 11 that filters noise in an input voltage of the driving chip and transmits the noise to the analog-to-digital conversion unit 12;
  • the filtering unit 11 is a low frequency filtering unit for filtering high frequency partial noise in the input voltage of the driving chip.
  • the input voltage is an ELVDD power supply voltage.
  • the ELVDD power supply voltage may cause a constant change of the ELVDD power supply voltage due to line impedance, power supply chip instability, temperature change, etc., and the driving chip
  • the gamma adjustment circuit transmits a change in the ELVDD supply voltage to the gamma generating unit 15, which adjusts the gamma voltage to output a stable gamma voltage, thereby reducing the influence due to variations in the ELVDD supply voltage.
  • the present invention further provides a method for adjusting a gamma voltage of a driving chip.
  • FIG. 4 it is a flowchart of a method for adjusting a gamma voltage of a driving chip according to an embodiment of the present invention, and FIG. 3 and FIG. The method includes:
  • Step S01 the analog-to-digital conversion unit 12 converts the voltage signal of the input voltage of the driving chip into a digital signal, and transmits it to the logic determining unit 13;
  • Step S02 the logic determining unit 13 determines the change of the input voltage according to the digital signal, and generates an adjustment signal is transmitted to the voltage adjusting unit 14;
  • Step S03 the voltage adjustment unit 14 generates a corresponding adjustment voltage, and is transmitted to the gamma generation unit 15;
  • Step S04 The gamma generating unit 15 adjusts the output gamma voltage according to the adjustment voltage.
  • the filtering unit 11 may further filter the noise in the input voltage of the driving chip and transmit the noise to the analog-to-digital conversion unit 12; in this embodiment, the filtering unit 11 is a low frequency filtering unit that filters high frequency partial noise in the input voltage of the driving chip.
  • the input voltage is an ELVDD power supply voltage.
  • the ELVDD power supply voltage may cause a constant change of the ELVDD power supply voltage due to line impedance, power supply chip instability, temperature change, etc., and the driving chip
  • the gamma adjustment circuit transmits a change in the ELVDD supply voltage to the Gamma generation unit 15, which generates a single Element 15 adjusts the Gamma voltage to output a stable Gamma voltage, thereby reducing the effects of changes in the ELVDD supply voltage.
  • the present invention also provides an AMOLED display.
  • FIG. 5 is a schematic structural diagram of an AMOLED display according to an embodiment of the present invention.
  • the AMOLED display includes a display panel 20 and is used for A driving chip 21 that supplies a driving signal to the display panel 20 is mounted on the display panel 20, and the driving chip 21 includes a Gamma adjusting circuit of the above-described driving chip.
  • the driving chip 21 is crimped to the terminal portion of the display panel 20 by a crimping method, and the driving chip 21 supplies a driving signal to the display panel 20 through a metal wire connected to the terminal portion. .
  • the display panel 20 includes a display area 22 and a non-display area 23 surrounding the display area 22, and the display area is provided with a plurality of pixel units 24 (for simplicity of the drawing, only two of the pixels are schematically illustrated in the figure)
  • the power chip 30 supplies the ELVDD power supply voltage to the pixel unit 24 through the ELVDD power supply line 31, and supplies the ELVSS power supply voltage to the pixel unit 24 through the ELVSS power supply line 32.
  • the driving chip 21 is connected to the ELVDD power line 31; the ELVDD power line 31 and the ELVSS power line 32 on the display panel 20 are metal lines, and It is fabricated together with any one of the metal layers in the array (TFT) substrate in the display panel 20.
  • the power chip 30 supplies the ELVDD power supply voltage to the pixel unit 24 through the ELVDD power supply line 31, and also inputs the ELVDD power supply voltage to the Gamma adjustment circuit in the drive chip 21.
  • the unit 11 filters noise in the ELVDD power supply voltage received by the driving chip 21, and transmits the noise to the analog-to-digital conversion unit 12; the analog-to-digital conversion unit 12 converts the filtered voltage signal into a digital signal and transmits it to the digital signal.
  • the logic determining unit 13 determines the change of the ELVDD power supply voltage according to the digital signal, and generates an adjustment signal to be transmitted to the voltage adjusting unit 14;
  • the node unit 14 generates a corresponding adjustment voltage and transmits it to the gamma generation unit 15;
  • the gamma generation unit 15 adjusts the gamma voltage according to the adjustment voltage, and outputs a stable gamma voltage to the display panel 30.
  • the ELVDD supply voltage is lowered by a magnitude
  • the voltage output by the Gamma adjustment circuit is synchronously reduced by the same amplitude based on the voltage corresponding to the Gamma curve, and the ELVDD supply voltage is increased by a magnitude.
  • the voltage outputted by the Gamma adjustment circuit is synchronously increased by the same amplitude based on the voltage corresponding to the Gamma curve, the change of the ELVDD power supply voltage can be cancelled, and the display brightness variation and each display caused by the ELVDD power supply voltage variation are solved.
  • the area shows uneven effects and improves display quality.
  • the driving chip 21 is connected to the ELVDD power line 31 in the non-display area 23 of the display panel 20.
  • the Gamma adjusting circuit of the driving chip can reduce the variation of the ELVDD power supply voltage.
  • the effect of the display brightness variation caused by the ELVDD power supply voltage variation and the uneven display effect of each display area is improved, and the display quality is improved; it can be understood that the Gamma adjustment circuit of the driving chip can also be used to reduce the rest.
  • the change in the input voltage such as the ELVSS supply voltage, or the voltage directly supplied to the display panel by the driver chip.
  • the present invention provides an analog-to-digital conversion unit, a logic determination unit, a voltage adjustment unit, and a gamma generation unit in a Gamma voltage adjustment circuit of a driver chip; the analog-to-digital conversion unit inputs a voltage signal of the input voltage of the driver chip.
  • the logic determining unit determines a change of the input voltage according to the digital signal, and generates an adjustment signal to be transmitted to the voltage adjusting unit;
  • the voltage adjusting unit generates a corresponding Adjusting the voltage and transmitting to the gamma generating unit;
  • the gamma generating unit adjusts the gamma voltage according to the adjusting voltage to reduce the influence due to the change of the input voltage;
  • the present invention relates the driving chip in the AMOLED display
  • the ELVDD power supply line is connected, so that the ELVDD power supply voltage is input to the driving chip, and the power is adjusted by the Gamma voltage of the driving chip.
  • the circuit transmits the change of the ELVDD power supply voltage to the Gamma generating unit, and the Gamma generating unit adjusts the Gamma voltage to cancel the change of the ELVDD power supply voltage, and solves the change of the display brightness caused by the ELVDD power supply voltage variation and the display effect of each display area is not
  • the phenomenon of uniformity improves the display quality.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Control Of El Displays (AREA)
  • Electroluminescent Light Sources (AREA)
  • Devices For Indicating Variable Information By Combining Individual Elements (AREA)

Abstract

一种驱动芯片的Gamma电压调整电路、Gamma电压调整方法以及AMOLED显示器，在驱动芯片的Gamma调整电路中设置模数转换单元（12）、逻辑判断单元（13）、电压调节单元（14）以及Gamma产生单元（15），将AMOLED显示器中的驱动芯片与ELVDD电源线相连接，使得ELVDD电源电压输入至驱动芯片，模数转换单元（12）将电压信号转换为数字信号；逻辑判断单元（13）根据数字信号判断ELVDD电源电压的变化，并生成调节信号；电压调节单元（14）生成相应的调节电压；Gamma产生单元（15）对Gamma电压做出调整，解决了因ELVDD电源电压变动造成的显示器亮度变化和各显示区域显示效果不均的现象，提高了显示品质。

Description

驱动芯片的Gamma电压调整电路和方法以及AMOLED显示器 技术领域
本发明涉及平板显示领域，具体涉及一种驱动芯片的Gamma电压调整电路和方法以及主动阵列有机发光显示器。
背景技术
主动阵列有机发光显示器(AMOLED)是主动发光器件。相比现在的主流平板显示技术薄膜晶体管液晶显示器(TFT-LCD)，AMOLED显示器具有高对比度、广视角、低功耗、厚度更薄等优点。
图1为传统的AMOLED显示器的结构示意图，如图1所示，AMOLED显示器包含显示区域1以及包围显示区域1的非显示区域2，在显示区域1内设置有若干规则排列的像素单元3，在非显示区域2上设置有驱动芯片(Driver IC)4，所述驱动芯片4用以向所述像素单元3提供驱动信号。AMOLED显示器的点亮需要ELVDD和ELVSS两个电源电压，这两个电源电压由电源芯片(power IC)5提供。然而，由于线路阻抗6、电源芯片5不稳定以及温度变化等原因，会导致ELVDD发生变化。
图2为传统的AMOLED显示器中像素电路结构示意图，该像素电路包括第一薄膜晶体管T1、第二薄膜晶体管T2、电容C和发光二极管OLED，OLED的亮度由通过OLED的电流控制。具体的，第二薄膜晶体管T2连接在电源电压ELVDD和OLED的阳极之间，电容C跨接在第二薄膜晶体管T2的栅极与ELVDD之间，OLED的阴极接电源电压ELVSS，第一薄膜晶体管T1连接在数据线DL与第二薄膜晶体管T2的栅极之间，第一薄膜晶体管T1的栅极连接扫描线SL，由扫描线SL传送的扫描信号控制第一薄膜晶体管T1的通断。请结合图1和图2，由驱动芯片4生成的信号电压(即 是在不同灰阶下显示的Gamma电压)通过数据线DL发送给像素电路，并通过第一薄膜晶体管T1施加在第二薄膜晶体管T2的栅极。当第二薄膜晶体管T2导通时，流过OLED的电流大小由电源电压ELVDD及DL传输的信号电压的电压压差决定，即OLED的亮度受控于电源电压ELVDD及驱动芯片4输出的Gamma电压。从图2中可以看出ELVDD的变动会直接影响通过OLED的电流，从而影响发光二极管OLED的亮度，可知，ELVDD的变动会造成显示器亮度变化或各区域显示效果不一致。
发明内容
本发明的目的在于提供一种驱动芯片的Gamma电压调整电路和Gamma电压调整方法以及AMOLED显示器，以解决由于ELVDD的变动造成的显示器亮度变化或各区域显示效果不一致的问题。
为实现上述目的，本发明提供一种驱动芯片的Gamma电压调整电路，所述电路包括模数转换单元、逻辑判断单元、电压调节单元以及Gamma产生单元；所述模数转换单元将所述驱动芯片的输入电压转换为数字信号，并传送至所述逻辑判断单元；所述逻辑判断单元根据所述数字信号判断所述输入电压的变化，并根据所述变化生成调节信号传送至所述电压调节单元；所述电压调节单元根据所述调节信号生成相应的调节电压，并传送至所述Gamma产生单元；所述Gamma产生单元根据所述调节电压对输出的Gamma电压做出调整。
可选的，所述输入电压为ELVDD电源电压。
可选的，所述电路还包括滤波单元，用以过滤所述驱动芯片的输入电压中的噪声，并将过滤后的输入电压传送至所述模数转换单元。
相应的，本发明还提供一种驱动芯片的Gamma电压调整方法，所述方法包括：
由模数转换单元将驱动芯片的输入电压转换为数字信号，并传送至逻辑判断单元；
所述逻辑判断单元根据所述数字信号判断输入电压的变化，并根据所述变化生成调节信号传送至电压调节单元；
所述电压调节单元根据所述调节信号生成相应的调节电压，并传送至Gamma产生单元；
所述Gamma产生单元根据所述调节电压对输出的Gamma电压做出调整。
可选的，所述输入电压为ELVDD电源电压。
可选的，在所述模数转换单元转换输入电压之前还包括：滤波单元过滤所述驱动芯片的输入电压中的噪声，并将过滤后的输入电压传送至模数转换单元。
相应的，本发明还提供一种AMOLED显示器，包括：
显示面板以及用于向所述显示面板提供驱动信号的驱动芯片，所述驱动芯片安装于所述显示面板上，所述驱动芯片包括上述的驱动芯片的Gamma电压调整电路。
可选的，所述输入电压为ELVDD电源电压。
可选的，所述显示面板包含显示区以及包围所述显示区的非显示区，所述显示区上设置有若干个像素单元，利用电源芯片通过ELVDD电源线向所述若干个像素单元提供ELVDD电源电压。
可选的，在所述显示面板的非显示区内所述驱动芯片与所述ELVDD电源线相连接。
与现有技术相比，本发明提供的驱动芯片的Gamma电压调整电路和Gamma电压调整方法以及AMOLED显示器的有益效果如下：
1、本发明在驱动芯片的Gamma电压调整电路中设置模数转换单元、 逻辑判断单元、电压调节单元以及Gamma产生单元；所述模数转换单元将所述驱动芯片输入电压的电压信号转换为数字信号，并传送至所述逻辑判断单元；所述逻辑判断单元根据所述数字信号判断输入电压的变化，并生成调节信号传送至所述电压调节单元；所述电压调节单元生成相应的调节电压，并传送至所述Gamma产生单元；所述Gamma产生单元根据所述调节电压对Gamma电压做出调整，降低了由于输入电压的变化造成的影响；
2、本发明将AMOLED显示器中的驱动芯片与ELVDD电源线相连接，使得ELVDD电源电压输入至驱动芯片，通过驱动芯片的Gamma电压调整电路将ELVDD电源电压的变化传送至Gamma产生单元，Gamma产生单元对Gamma电压做出调整，以抵消ELVDD电源电压的变化，解决了因ELVDD电源电压变动造成的显示器亮度变化和各显示区域显示效果不均的现象，提高了显示品质。
附图说明
图1为传统的AMOLED显示器的结构示意图。
图2为传统的AMOLED显示器中像素电路结构示意图。
图3为本发明一实施例提供的驱动芯片的Gamma电压调整电路的结构示意图。
图4为本发明一实施例提供的驱动芯片的Gamma电压调整方法的流程图。
图5为本发明一实施例提供的AMOLED显示器的结构示意图。
具体实施方式
为使本发明的内容更加清楚易懂，以下结合说明书附图，对本发明的内容做进一步说明。当然本发明并不局限于该具体实施例，本领域的技术 人员所熟知的一般替换也涵盖在本发明的保护范围内。
其次，本发明利用示意图进行了详细的表述，在详述本发明实例时，为了便于说明，示意图不依照一般比例局部放大，不应对此作为本发明的限定。
本发明的核心思想在于，在驱动芯片的Gamma电压调整电路中设置模数转换单元、逻辑判断单元、电压调节单元以及Gamma产生单元；所述模数转换单元将所述驱动芯片输入电压的电压信号转换为数字信号，并传送至所述逻辑判断单元；所述逻辑判断单元根据所述数字信号判断输入电压的变化，并生成调节信号传送至所述电压调节单元；所述电压调节单元生成相应的调节电压，并传送至所述Gamma产生单元；所述Gamma产生单元根据所述调节电压对Gamma电压做出调整，降低了由于输入电压的变化造成的影响。
请参考图3，其为本发明实施例一所提供的驱动芯片的Gamma电压调整电路的结构示意图。如图3所示，所述驱动芯片的Gamma电压调整电路包括：模数转换单元12、逻辑判断单元13、电压调节单元14以及Gamma产生单元15；所述模数转换单元12将所述驱动芯片输入电压的电压信号转换为数字信号，并传送至所述逻辑判断单元13；所述逻辑判断单元13根据所述数字信号判断输入电压的变化，并生成调节信号传送至所述电压调节单元14；所述电压调节单元14生成相应的调节电压，并传送至所述Gamma产生单元15；所述Gamma产生单元15根据所述调节电压对输出的Gamma电压做出调整。
可选的，所述驱动芯片的Gamma电压调整电路还包括滤波单元11，所述滤波单元11过滤所述驱动芯片的输入电压中的噪声，并传送至所述模数转换单元12；本实施例中，所述滤波单元11为低频滤波单元，用于过滤所述驱动芯片的输入电压中的高频部分噪声。
所述输入电压为ELVDD电源电压，所述ELVDD电源电压在传输至像素电路的过程中，由于线路阻抗、电源芯片不稳定、温度变化等原因会造成ELVDD电源电压的不断变化，而所述驱动芯片的Gamma调整电路将ELVDD电源电压的变化传送至Gamma产生单元15，所述Gamma产生单元15对Gamma电压做出调整，输出稳定的Gamma电压，由此降低由于ELVDD电源电压的变化造成的影响。
相应的，本发明还提供一种驱动芯片的Gamma电压调整方法，请参考图4，其为本发明一实施例所提供的驱动芯片的Gamma电压调整方法的流程图，结合图3与图4，所述的方法包括：
步骤S01：所述模数转换单元12将所述驱动芯片输入电压的电压信号转换为数字信号，并传送至逻辑判断单元13；
步骤S02：所述逻辑判断单元13根据所述数字信号判断输入电压的变化，并生成调节信号传送至电压调节单元14；
步骤S03：所述电压调节单元14生成相应的调节电压，并传送至Gamma产生单元15；
步骤S04：所述Gamma产生单元15根据所述调节电压对输出的Gamma电压做出调整。
在步骤S01中，在所述模数转换单元12转换电压信号之前还可包括：滤波单元11过滤所述驱动芯片的输入电压中的噪声，并传送至模数转换单元12；本实施例中，所述滤波单元11为低频滤波单元，过滤所述驱动芯片的输入电压中的高频部分噪声。
所述输入电压为ELVDD电源电压，所述ELVDD电源电压在传输至像素电路的过程中，由于线路阻抗、电源芯片不稳定、温度变化等原因会造成ELVDD电源电压的不断变化，而所述驱动芯片的Gamma调整电路将ELVDD电源电压的变化传送至Gamma产生单元15，所述Gamma产生单 元15对Gamma电压做出调整，输出稳定的Gamma电压，由此降低由于ELVDD电源电压的变化造成的影响。
相应的，本发明还提供一种AMOLED显示器，请参考图5，其为本发明一实施例所提供的AMOLED显示器的结构示意图，如图5所示，所述AMOLED显示器包括显示面板20以及用于向所述显示面板20提供驱动信号的驱动芯片21，所述驱动芯片21安装于所述显示面板20上，所述驱动芯片21包括上述的驱动芯片的Gamma调整电路。
本实施例中，通过压接的方法将所述驱动芯片21压接于所述显示面板20的端子部，所述驱动芯片21通过与端子部连接的金属线向所述显示面板20提供驱动信号。
所述显示面板20包含显示区22以及包围显示区22的非显示区23，所述显示区上设置有若干个像素单元24(为简化附图，图中仅示意性地画出其中两个像素单元)，电源芯片30通过ELVDD电源线31向所述像素单元24提供ELVDD电源电压，通过ELVSS电源线32向所述像素单元24提供ELVSS电源电压。在所述显示面板20的非显示区23内，所述驱动芯片21与所述ELVDD电源线31相连接；位于所述显示面板20上的ELVDD电源线31与ELVSS电源线32为金属线，可以与所述显示面板20中阵列(TFT)基板内的任意一层金属层一起制作。
电源芯片30通过ELVDD电源线31向所述像素单元24提供ELVDD电源电压的同时，也将ELVDD电源电压输入至所述驱动芯片21中的Gamma调整电路，请结合图3与图5，所述滤波单元11过滤所述驱动芯片21接收到的ELVDD电源电压中的噪声，并传送至所述模数转换单元12；所述模数转换单元12将过滤后的电压信号转换为数字信号，并传送至所述逻辑判断单元13；所述逻辑判断单元13根据所述数字信号判断ELVDD电源电压的变化，并生成调节信号传送至所述电压调节单元14；所述电压调 节单元14生成相应的调节电压，并传送至所述Gamma产生单元15；所述Gamma产生单元15根据所述调节电压对Gamma电压做出调整，向显示面板30输出稳定的Gamma电压。根据本发明的较佳实施例，当ELVDD电源电压降低一幅值时，Gamma调整电路输出的电压在Gamma曲线对应的电压基础上同步降低一相同的幅值，当ELVDD电源电压升高一幅值时，Gamma调整电路输出的电压在Gamma曲线对应的电压基础上同步升高一相同的幅值，由此可以抵消ELVDD电源电压的变化，解决了因ELVDD电源电压变动造成的显示器亮度变化和各显示区域显示效果不均的现象，提高了显示品质。
在上述实施例中，在所述显示面板20的非显示区23内所述驱动芯片21与所述ELVDD电源线31相连接，所述驱动芯片的Gamma调整电路可以降低由于ELVDD电源电压的变化造成的影响，解决了因ELVDD电源电压变动造成的显示器亮度变化和各显示区域显示效果不均的现象，提高了显示品质；可以理解的是，所述驱动芯片的Gamma调整电路也可以用来降低其余的输入电压的变化，例如ELVSS电源电压，或者直接由驱动芯片提供给显示面板的电压。
综上所述，本发明在驱动芯片的Gamma电压调整电路中设置模数转换单元、逻辑判断单元、电压调节单元以及Gamma产生单元；所述模数转换单元将所述驱动芯片输入电压的电压信号转换为数字信号，并传送至所述逻辑判断单元；所述逻辑判断单元根据所述数字信号判断输入电压的变化，并生成调节信号传送至所述电压调节单元；所述电压调节单元生成相应的调节电压，并传送至所述Gamma产生单元；所述Gamma产生单元根据所述调节电压对Gamma电压做出调整，降低了由于输入电压的变化造成的影响；本发明将AMOLED显示器中的驱动芯片与ELVDD电源线相连接，使得ELVDD电源电压输入至驱动芯片，通过驱动芯片的Gamma电压调整电 路将ELVDD电源电压的变化传送至Gamma产生单元，Gamma产生单元对Gamma电压做出调整，以抵消ELVDD电源电压的变化，解决了因ELVDD电源电压变动造成的显示器亮度变化和各显示区域显示效果不均的现象，提高了显示品质。
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 (10)

  1. 一种驱动芯片的Gamma电压调整电路，其特征在于，包括模数转换单元、逻辑判断单元、电压调节单元以及Gamma产生单元；所述模数转换单元将所述驱动芯片的输入电压转换为数字信号，并传送至所述逻辑判断单元；所述逻辑判断单元根据所述数字信号判断所述输入电压的变化，并根据所述变化生成调节信号传送至所述电压调节单元；所述电压调节单元根据所述调节信号生成相应的调节电压，并传送至所述Gamma产生单元；所述Gamma产生单元根据所述调节电压对输出的Gamma电压做出调整。
  2. 如权利要求1所述的驱动芯片的Gamma电压调整电路，其特征在于，所述输入电压为ELVDD电源电压。
  3. 如权利要求1所述的驱动芯片的Gamma电压调整电路，其特征在于，还包括滤波单元，用以过滤所述驱动芯片的输入电压中的噪声，并将过滤后的输入电压传送至所述模数转换单元。
  4. 一种驱动芯片的Gamma电压调整方法，其特征在于，所述方法包括：
    由模数转换单元将驱动芯片的输入电压转换为数字信号，并传送至逻辑判断单元；
    所述逻辑判断单元根据所述数字信号判断输入电压的变化，并根据所述变化生成调节信号传送至电压调节单元；
    所述电压调节单元根据所述调节信号生成相应的调节电压，并传送至Gamma产生单元；
    所述Gamma产生单元根据所述调节电压对输出的Gamma电压做出调整。
  5. 如权利要求4所述的驱动芯片的Gamma电压调整方法，其特征在于，所述输入电压为ELVDD电源电压。
  6. 如权利要求4所述的驱动芯片的Gamma电压调整方法，其特征在于，在所述模数转换单元转换输入电压之前还包括：
    滤波单元过滤所述驱动芯片的输入电压中的噪声，并将过滤后的输入电压传送至模数转换单元。
  7. 一种AMOLED显示器，其特征在于，所述显示器包括显示面板以及用于向所述显示面板提供驱动信号的驱动芯片，所述驱动芯片安装于所述显示面板上，所述驱动芯片包括如权利要求1-3中任一项所述的驱动芯片的Gamma电压调整电路。
  8. 如权利要求7所述的AMOLED显示器，其特征在于，所述输入电压为ELVDD电源电压。
  9. 如权利要求8所述的AMOLED显示器，其特征在于，所述显示面板包含显示区以及包围所述显示区的非显示区，所述显示区上设置有若干个像素单元，利用电源芯片通过ELVDD电源线向所述若干个像素单元提供ELVDD电源电压。
  10. 如权利要求9所述的AMOLED显示器，其特征在于，在所述显示面板的非显示区内所述驱动芯片与所述ELVDD电源线相连接。
PCT/CN2015/096087 2014-12-23 2015-12-01 驱动芯片的Gamma电压调整电路和方法以及AMOLED显示器 WO2016101772A1 (zh)

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