WO2017215035A1 - 液晶显示器驱动电路及液晶显示装置 - Google Patents

液晶显示器驱动电路及液晶显示装置 Download PDF

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Publication number
WO2017215035A1
WO2017215035A1 PCT/CN2016/087667 CN2016087667W WO2017215035A1 WO 2017215035 A1 WO2017215035 A1 WO 2017215035A1 CN 2016087667 W CN2016087667 W CN 2016087667W WO 2017215035 A1 WO2017215035 A1 WO 2017215035A1
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WIPO (PCT)
Prior art keywords
brightness
liquid crystal
crystal display
backlight
gamma voltage
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PCT/CN2016/087667
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English (en)
French (fr)
Inventor
郭星灵
杨翔
秦杰辉
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Wuhan China Star Optoelectronics Technology Co Ltd
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Wuhan China Star Optoelectronics Technology Co Ltd
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Priority to US15/118,880 priority Critical patent/US10120236B2/en
Publication of WO2017215035A1 publication Critical patent/WO2017215035A1/zh
Anticipated expiration legal-status Critical
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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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • 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
    • G09G3/34—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 by control of light from an independent source
    • G09G3/36—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 by control of light from an independent source using liquid crystals
    • G09G3/3607—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 by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F2203/00—Function characteristic
    • G02F2203/30—Gray scale
    • 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
    • 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
    • G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
    • G09G2320/0276—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping for the purpose of adaptation to the characteristics of a display device, i.e. gamma correction
    • 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
    • G09G2320/0626—Adjustment of display parameters for control of overall brightness
    • G09G2320/0646—Modulation of illumination source brightness and image signal correlated to each other
    • 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
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02—Details of power systems and of start or stop of display operation
    • G09G2330/021—Power management, e.g. power saving
    • 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
    • G09G2360/14—Detecting light within display terminals, e.g. using a single or a plurality of photosensors
    • G09G2360/145—Detecting light within display terminals, e.g. using a single or a plurality of photosensors the light originating from the display 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 the field of display, and in particular, to a liquid crystal display driving circuit and a liquid crystal display device.
  • liquid crystal display devices such as mobile phones, personal digital assistants (PDAs), notebook computers, and tablet computers are mostly oriented toward thinner, lighter, more portable, and more versatile.
  • the screen power consumption of the liquid crystal display device generally accounts for 60%-70% of the overall power consumption of the liquid crystal display device.
  • the power consumption of the backlight module accounts for 70%-80% of the total screen power consumption.
  • the thinning of these liquid crystal display devices defines the size and capacity of the battery in the liquid crystal display device. Therefore, in the case where the size and capacity of the battery are limited, it is often necessary to reduce the power consumption of the backlight module to increase the endurance of the liquid crystal display device.
  • the power consumption of the backlight module is reduced, and the brightness of the screen outputted by the liquid crystal display device is also lowered, thereby affecting the observation effect of the screen.
  • the invention provides a liquid crystal display driving circuit, the liquid crystal display driving circuit comprises a dynamic backlight control circuit and a Gamma voltage adjusting circuit, wherein the dynamic backlight control circuit is used for adjusting the brightness of the backlight module in the liquid crystal display, when the dynamic backlight When the control circuit is turned on, the dynamic backlight control circuit controls the brightness of the backlight module to change from the first backlight brightness to the second backlight brightness, wherein the brightness of the first backlight brightness is greater than the brightness of the second backlight brightness
  • the Gamma voltage adjustment circuit outputs a first gamma voltage to adjust a grayscale brightness of the liquid crystal display to a first gray level brightness, when the backlight The brightness of the module is When the second backlight brightness is described, the Gamma voltage adjustment circuit outputs a second gamma voltage to adjust the gray scale brightness of the liquid crystal display to a second gray level brightness, wherein the brightness of the second gray level brightness is greater than the first a brightness of a gray scale
  • the Gamma voltage adjustment circuit includes a Gamma curve feedback unit, a control unit, a storage unit, and a Gamma voltage output unit.
  • the Gamma curve feedback unit is configured to detect that the brightness of the backlight module is adjusted by the first backlight brightness.
  • the grayscale brightness of the liquid crystal display is the second grayscale brightness, and the second grayscale brightness is transmitted to the control unit, wherein the control unit is based on the second grayscale brightness
  • the second gamma voltage corresponding to the second gray level brightness is retrieved from the storage unit, and the second gamma voltage is outputted through the gamma control unit.
  • the Gamma voltage adjustment circuit further includes a line buffer for receiving RGB sub-pixel serial gray scale signals, and converting the RGB sub-pixel gray scale signals into RGB sub-pixels.
  • a parallel gray-scale signal wherein the RGB sub-pixel serial gray-scale signal is a serial signal, the RGB sub-pixel parallel gray-scale signal is a parallel signal, and the digital-to-analog converter is configured to be grayed out according to the RGB sub-pixel
  • the order signal converts the analog Gamma voltage generated by the Gamma voltage output unit into a digital Gamma voltage, and outputs the digital Gamma signal to a corresponding pixel electrode in the liquid crystal display.
  • the gamma voltage adjustment circuit further includes a boosting unit, configured to receive the RGB sub-pixel parallel gray-scale signal, and output the voltage of the RGB sub-pixel parallel gray-scale signal to be output to The digital to analog converter.
  • the dynamic backlight control circuit when the dynamic backlight control circuit is turned off, the brightness of the backlight module in the liquid crystal display does not change, and when the dynamic backlight control circuit is turned off, the Gamma voltage adjustment circuit does not work.
  • the present invention also provides a liquid crystal display device comprising a liquid crystal display and a liquid crystal display driving circuit, the liquid crystal display driving circuit comprising a dynamic backlight control circuit and a Gamma voltage adjusting circuit, wherein the dynamic backlight control circuit is used for adjusting Backlight mode in liquid crystal display
  • the dynamic backlight control circuit is used for adjusting Backlight mode in liquid crystal display
  • the dynamic backlight control circuit controls the brightness of the backlight module from the first backlight brightness to the second backlight brightness, wherein the brightness of the first backlight brightness
  • the brightness of the backlight module is greater than the brightness of the second backlight.
  • the Gamma voltage adjustment circuit outputs a first gamma voltage to adjust the gray level brightness of the liquid crystal display.
  • the Gamma voltage adjustment circuit outputs a second Gamma voltage to adjust the gray scale brightness of the liquid crystal display to a second gray level brightness,
  • the brightness of the second gray level brightness is greater than the brightness of the first gray level brightness, and when the gray level brightness of the liquid crystal display is the second gray level brightness and the brightness of the backlight module is the second backlight
  • the brightness of the screen output by the liquid crystal display when the brightness is equal to the gray level brightness of the liquid crystal display is the first gray level brightness and the brightness of the backlight module is the first backlight brightness Crystal display brightness of the screen output.
  • the Gamma voltage adjustment circuit includes a Gamma curve feedback unit, a control unit, a storage unit, and a Gamma voltage output unit.
  • the Gamma curve feedback unit is configured to detect that the brightness of the backlight module is adjusted by the first backlight brightness.
  • the grayscale brightness of the liquid crystal display is the second grayscale brightness, and the second grayscale brightness is transmitted to the control unit, wherein the control unit is based on the second grayscale brightness
  • the second gamma voltage corresponding to the second gray level brightness is retrieved from the storage unit, and the second gamma voltage is outputted through the gamma control unit.
  • the Gamma voltage adjustment circuit further includes a line buffer for receiving RGB sub-pixel serial gray scale signals, and converting the RGB sub-pixel gray scale signals into RGB sub-pixels.
  • a parallel gray-scale signal wherein the RGB sub-pixel serial gray-scale signal is a serial signal, the RGB sub-pixel parallel gray-scale signal is a parallel signal, and the digital-to-analog converter is configured to be grayed out according to the RGB sub-pixel
  • the order signal converts the analog Gamma voltage generated by the Gamma voltage output unit into a digital Gamma voltage, and outputs the digital Gamma signal to a corresponding pixel electrode in the liquid crystal display.
  • the gamma voltage adjustment circuit further includes a boosting unit, configured to receive the RGB sub-pixel parallel gray-scale signal, and output the voltage of the RGB sub-pixel parallel gray-scale signal to be output to The digital to analog converter.
  • the backlight module in the liquid crystal display The brightness does not change, and the Gamma voltage adjustment circuit does not operate when the dynamic backlight control circuit is turned off.
  • the dynamic backlight control circuit in the liquid crystal display driving circuit of the present invention when the dynamic backlight control circuit in the liquid crystal display driving circuit of the present invention is turned on, the brightness of the backlight module is reduced from the first backlight brightness to the second backlight brightness.
  • the Gamma voltage adjustment circuit adjusts the output gamma voltage.
  • the gamma voltage adjustment circuit When the brightness of the backlight module is the first backlight brightness, the gamma voltage adjustment circuit outputs a first gamma voltage to adjust the gray scale of the liquid crystal display. The two pairs are the first grayscale brightness.
  • the Gamma voltage adjustment circuit outputs a second gamma voltage to adjust the brightness of the liquid crystal display to a second gray level brightness.
  • the brightness of the second gray level brightness is greater than the brightness of the first gray level brightness, and when the gray level brightness of the liquid crystal display is the second gray level brightness and the brightness of the backlight module is the second backlight
  • the brightness of the screen output by the liquid crystal display at the time of brightness is equal to the brightness of the liquid crystal display output screen when the gray scale brightness of the liquid crystal display is the first gray scale brightness and the brightness of the backlight module is the first backlight brightness . Therefore, while reducing the power consumption of the backlight module, the brightness of the screen output by the liquid crystal display device is unchanged, and the viewing effect of the screen is not affected.
  • FIG. 1 is a circuit block diagram of a liquid crystal display driving circuit according to a preferred embodiment of the present invention.
  • FIG. 2 is a circuit block diagram of a Gamma voltage adjustment circuit according to a preferred embodiment of the present invention.
  • FIG. 3 is a circuit block diagram of a Gamma voltage adjustment circuit according to another preferred embodiment of the present invention.
  • FIG. 4 is a circuit block diagram of a liquid crystal display device according to a preferred embodiment of the present invention.
  • FIG. 1 is a circuit block diagram of a liquid crystal display driving circuit according to a preferred embodiment of the present invention
  • FIG. 2 is a circuit block diagram of a Gamma voltage adjusting circuit according to a preferred embodiment of the present invention
  • 3 is a circuit block diagram of a Gamma voltage adjustment circuit according to another preferred embodiment of the present invention.
  • the liquid crystal display driving circuit 10 includes a Content Adaptive Brightness Control (CABC) circuit 100 and a Gamma voltage adjusting circuit 300.
  • CABC Content Adaptive Brightness Control
  • the dynamic backlight control circuit 100 is configured to adjust the brightness of the backlight module in the liquid crystal display.
  • the dynamic backlight control circuit 100 controls the brightness of the backlight module by the brightness of the first backlight.
  • the second backlight brightness is changed, wherein the brightness of the first backlight brightness is greater than the brightness of the second backlight brightness. That is, when the dynamic backlight control circuit 100 is turned on, the dynamic backlight control circuit 100 reduces the brightness of the backlight module, that is, reduces the power consumption of the backlight module.
  • the Gamma voltage adjustment circuit 300 outputs a first gamma voltage to adjust the gray scale brightness of the liquid crystal display to a first gray level brightness.
  • the Gamma voltage adjustment circuit 300 When the brightness of the backlight module is the brightness of the second backlight, the Gamma voltage adjustment circuit 300 outputs a second gamma voltage to adjust the grayscale brightness of the liquid crystal display to a second gray level brightness.
  • the brightness of the second gray level brightness is greater than the brightness of the first gray level brightness, and when the gray level brightness of the liquid crystal display is the second gray level brightness and the brightness of the backlight module is the second backlight
  • the brightness of the screen output by the liquid crystal display at the time of brightness is equal to the brightness of the liquid crystal display output screen when the gray scale brightness of the liquid crystal display is the first gray scale brightness and the brightness of the backlight module is the first backlight brightness .
  • the Gamma voltage adjustment circuit 300 includes a Gamma curve feedback unit 310, a control unit 320, a storage unit 330, and a Gamma voltage output unit 340.
  • the gamma curve feedback unit 310 is configured to detect a grayscale brightness of the liquid crystal display when the brightness of the backlight module is changed. When the brightness of the backlight module is adjusted from a first backlight brightness to a second backlight brightness, The gamma curve feedback unit 310 detects that the gray scale brightness of the liquid crystal display is the second gray level brightness, and transmits the second gray level brightness to the control unit 320.
  • the control unit 320 retrieves the second gamma voltage corresponding to the second grayscale luminance from the storage unit 330 according to the second grayscale luminance, and passes the second gamma voltage via the gamma
  • the control unit 340 outputs.
  • Each of the storage units 330 stores in advance a grayscale brightness and a gamma corresponding to each gray scale.
  • the voltage, the respective gray scales, and the Gamma voltages corresponding to the respective gray scales may be stored in the storage unit in the form of a list, but not limited to.
  • the grayscale brightness corresponding to each gamma voltage and the brightness of the generated backlight of the current backlight module corresponding to the grayscale are fixed. changing.
  • the Gamma voltage adjustment circuit 300 further includes a line buffer 350 and a digital-to-analog converter (D/A Converter) 360.
  • the line buffer 350 is configured to receive an RGB sub-pixel serial gray-scale signal, and convert the RGB sub-pixel gray-scale signal into an RGB sub-pixel parallel gray-scale signal, wherein the RGB sub-pixel serial gray-scale signal For a serial signal, the RGB sub-pixel parallel gray-scale signals are parallel signals.
  • the digital-to-analog converter 360 is configured to convert an analog gamma voltage generated by the gamma voltage output unit into a digital gamma voltage according to the RGB sub-pixel parallel gray-scale signal, and output the digital gamma signal to the liquid crystal display Corresponding pixel electrode in .
  • the Gamma voltage adjustment circuit 300 further includes a boosting unit (Level Shifter) 370.
  • the boosting unit 370 is configured to receive the RGB sub-pixel parallel gray-scale signal, and output the voltage of the RGB sub-pixel parallel gray-scale signal to the digital-to-analog converter 360.
  • the RGB sub-pixel parallel gray-scale signal boosted by the boosting unit 370, so that the digital-to-analog converter 360 can select the gamma voltage output unit 340 according to the RGB sub-pixel parallel gray-scale signal more accurately.
  • One of the plurality of simulated Gamma voltages generated simulates a Gamma voltage signal.
  • the Gamma voltage adjustment circuit 300 further includes a buffer unit 380.
  • the buffer unit 380 is configured to buffer the digital gamma signal for a preset time and output to a corresponding pixel electrode in the liquid crystal display.
  • the dynamic backlight control circuit 100 when the dynamic backlight control circuit 100 is turned off, the brightness of the backlight module in the liquid crystal display does not change. Therefore, when the dynamic backlight control circuit is turned off, the Gamma voltage adjustment circuit 300 is It does not work, that is, the Gamma voltage output by the Gamma voltage adjustment circuit 300 does not change.
  • the dynamic backlight control circuit 100 in the liquid crystal display driving circuit 10 of the present invention when the dynamic backlight control circuit 100 in the liquid crystal display driving circuit 10 of the present invention is turned on, the brightness of the backlight module is reduced from the first backlight brightness to the second backlight brightness.
  • the Gamma voltage adjustment circuit 300 adjusts the output Gamma voltage when the backlight mode
  • the Gamma voltage adjustment circuit 300 outputs the first gamma voltage to adjust the gray level two pairs of the liquid crystal display to the first gray level brightness.
  • the Gamma voltage adjustment circuit 300 outputs a second gamma voltage to adjust the brightness of the liquid crystal display to a second gray level brightness.
  • the brightness of the second gray level brightness is greater than the brightness of the first gray level brightness, and when the gray level brightness of the liquid crystal display is the second gray level brightness and the brightness of the backlight module is the second backlight
  • the brightness of the screen output by the liquid crystal display at the time of brightness is equal to the brightness of the liquid crystal display output screen when the gray scale brightness of the liquid crystal display is the first gray scale brightness and the brightness of the backlight module is the first backlight brightness . Therefore, while reducing the power consumption of the backlight module, the brightness of the screen output by the liquid crystal display device is unchanged, and the viewing effect of the screen is not affected.
  • the present invention also provides a liquid crystal display device.
  • FIG. 4 is a circuit block diagram of a liquid crystal display device according to a preferred embodiment of the present invention.
  • the liquid crystal display device 1 includes a liquid crystal display 30 and a liquid crystal display driving circuit 10. Please refer to the foregoing description for the liquid crystal display driving circuit 10, and details are not described herein again.
  • the liquid crystal display device 1 includes but is not limited to, but not limited to, a smart phone, a mobile Internet device (MID), an e-book, a tablet computer, and a portable play station (Play Station Portable). Portable devices such as PSP) or Personal Digital Assistant (PDA).
  • MID mobile Internet device
  • PDA Personal Digital Assistant

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Computer Hardware Design (AREA)
  • Theoretical Computer Science (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Optics & Photonics (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Display Device Control (AREA)

Abstract

一种液晶显示器驱动电路（10）及液晶显示装置。液晶显示器驱动电路（10）包括动态背光控制电路（100）及Gamma电压调整电路（300），当动态背光控制电路（100）开启时，动态背光控制电路（100）控制背光模组的亮度由第一背光亮度变为第二背光亮度，当背光模组的亮度为第一背光亮度时，Gamma电压调整电路（300）输出第一Gamma电压以调整液晶显示器的灰阶亮度为第一灰阶亮度，当背光模组的亮度为第二背光亮度时，Gamma电压调整电路（300）输出第二Gamma电压以调整液晶显示器的灰阶亮度为第二灰阶亮度，当液晶显示器的灰阶亮度为第二灰阶亮度且背光模组的亮度为第二背光亮度时的液晶显示器输出的画面的亮度等于液晶显示器的灰阶亮度为第一灰阶亮度且背光模组的亮度为第一背光亮度时的液晶显示器输出画面的亮度。

Description

液晶显示器驱动电路及液晶显示装置
本发明要求2016年6月17日递交的发明名称为“液晶显示器驱动电路及液晶显示装置”的申请号201610431967.4的在先申请优先权，上述在先申请的内容以引入的方式并入本文本中。
技术领域
本发明涉及显示领域，尤其涉及一种液晶显示器驱动电路及液晶显示装置。
背景技术
随着电子产业日益发达，移动电话(Mobile Phone)、个人数字助理(Personal Digital Assistant，PDA)、笔记本型计算机及平板电脑(Planet Computer)等液晶显示装置大都朝向更轻薄、便携和多功能的方向发展。液晶显示装置的屏幕功耗一般占液晶显示装置整体功耗的60％-70％。而屏幕里边，背光模组的功耗占整个屏幕功耗的70％-80％。然而，由于这些液晶显示装置的轻薄化限定了液晶显示装置中电池的大小和容量。因此，在电池的大小和容量有限的情况下，往往需要降低背光模组的功耗来增加液晶显示装置的续航能力。然而，背光模组的功耗降低了，则液晶显示装置输出的画面的亮度也会降低，从而影响了画面的观测效果。
发明内容
本发明提供一种液晶显示器驱动电路，所述液晶显示器驱动电路包括动态背光控制电路及Gamma电压调整电路，所述动态背光控制电路用于调整液晶显示器中背光模组的亮度，当所述动态背光控制电路开启时，所述动态背光控制电路控制所述背光模组的亮度由第一背光亮度变为第二背光亮度，其中，所述第一背光亮度的亮度大于所述第二背光亮度的亮度，当所述背光模组的亮度为所述第一背光亮度时，所述Gamma电压调整电路输出第一Gamma电压以调整所述液晶显示器的灰阶亮度为第一灰阶亮度，当所述背光模组的亮度为所 述第二背光亮度时，所述Gamma电压调整电路输出第二Gamma电压以调整所述液晶显示器的灰阶亮度为第二灰阶亮度，其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。
其中，所述Gamma电压调整电路包括Gamma曲线反馈单元、控制单元、存储单元及Gamma电压输出单元，所述Gamma曲线反馈单元用于侦测所述背光模组的亮度由第一背光亮度调整为第二背光亮度时所述液晶显示器的灰阶亮度为所述第二灰阶亮度，并将所述第二灰阶亮度传输至所述控制单元，所述控制单元根据所述第二灰阶亮度从所述存储单元中调取所述第二灰阶亮度对应的所述第二Gamma电压，并将所述第二Gamma电压经由所述Gamma控制单元输出。
其中，所述Gamma电压调整电路还包括线缓冲器及数模转换器，所述线缓冲器用于接收RGB子像素串行灰阶信号，并将所述RGB子像素灰阶信号转换为RGB子像素并行灰阶信号，其中，所述RGB子像素串行灰阶信号为串行信号，所述RGB子像素并行灰阶信号为并行信号，所述数模转换器用于根据所述RGB子像素并行灰阶信号将所述Gamma电压输出单元产生的模拟Gamma电压转换为数字Gamma电压，并将所述数字Gamma信号输出至所述液晶显示器中的相应像素电极。
其中，所述Gamma电压调整电路还包括升压单元，所述升压单元用于接收所述RGB子像素并行灰阶信号，并将所述RGB子像素并行灰阶信号的电压升高之后输出给所述数模转换器。
其中，当所述动态背光控制电路关闭时，所述液晶显示器中的背光模组的亮度不变，当所述动态背光控制电路关闭时，所述Gamma电压调整电路不工作。
本发明还提供了一种液晶显示装置，所述液晶显示器包括液晶显示器及液晶显示器驱动电路，所述液晶显示器驱动电路包括动态背光控制电路及Gamma电压调整电路，所述动态背光控制电路用于调整液晶显示器中背光模 组的亮度，当所述动态背光控制电路开启时，所述动态背光控制亮度控制所述背光模组的亮度由第一背光亮度变为第二背光亮度，其中，所述第一背光亮度的亮度大于所述第二背光亮度的亮度，当所述背光模组的亮度为所述第一背光亮度时，所述Gamma电压调整电路输出第一Gamma电压以调整所述液晶显示器的灰阶亮度为第一灰阶亮度，当所述背光模组的亮度为所述第二背光亮度时，所述Gamma电压调整电路输出第二Gamma电压以调整所述液晶显示器的灰阶亮度为第二灰阶亮度，其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。
其中，所述Gamma电压调整电路包括Gamma曲线反馈单元、控制单元、存储单元及Gamma电压输出单元，所述Gamma曲线反馈单元用于侦测所述背光模组的亮度由第一背光亮度调整为第二背光亮度时所述液晶显示器的灰阶亮度为所述第二灰阶亮度，并将所述第二灰阶亮度传输至所述控制单元，所述控制单元根据所述第二灰阶亮度从所述存储单元中调取所述第二灰阶亮度对应的所述第二Gamma电压，并将所述第二Gamma电压经由所述Gamma控制单元输出。
其中，所述Gamma电压调整电路还包括线缓冲器及数模转换器，所述线缓冲器用于接收RGB子像素串行灰阶信号，并将所述RGB子像素灰阶信号转换为RGB子像素并行灰阶信号，其中，所述RGB子像素串行灰阶信号为串行信号，所述RGB子像素并行灰阶信号为并行信号，所述数模转换器用于根据所述RGB子像素并行灰阶信号将所述Gamma电压输出单元产生的模拟Gamma电压转换为数字Gamma电压，并将所述数字Gamma信号输出至所述液晶显示器中的相应像素电极。
其中，所述Gamma电压调整电路还包括升压单元，所述升压单元用于接收所述RGB子像素并行灰阶信号，并将所述RGB子像素并行灰阶信号的电压升高之后输出给所述数模转换器。
其中，当所述动态背光控制电路关闭时，所述液晶显示器中的背光模组的 亮度不变，当所述动态背光控制电路关闭时，所述Gamma电压调整电路不工作。
相较于现有技术，本发明的液晶显示器驱动电路中的动态背光控制电路开启时，所述背光模组的亮度由第一背光亮度降低为第二背光亮度。此时，所述Gamma电压调整电路调整输出的Gamma电压，当所述背光模组的亮度为第一背光亮度时，所述Gamma电压调整电路输出第一Gamma电压以调整所述液晶显示器的灰阶两对为第一灰阶亮度。当所述背光模组的亮度为第二背光亮度时，所述Gamma电压调整电路输出第二Gamma电压以调整所述液晶显示器的亮度为第二灰阶亮度。其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。从而在降低所述背光模组的功耗的同时，使得所述液晶显示装置输出的画面的亮度不变，不影响画面的观看效果。
附图说明
为了更清楚地说明本发明实施例或现有技术中的技术方案，下面将对实施例或现有技术描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本发明一较佳实施方式的液晶显示器驱动电路的电路框图。
图2为本发明一较佳实施方式的Gamma电压调整电路的电路框图。
图3为本发明另一较佳实施方式的Gamma电压调整电路的电路框图。
图4为本发明一较佳实施方式的液晶显示装置的电路框图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造 性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
请参阅图1，图2和图3，图1为本发明一较佳实施方式的液晶显示器驱动电路的电路框图；图2为本发明一较佳实施方式的Gamma电压调整电路的电路框图；图3为本发明另一较佳实施方式的Gamma电压调整电路的电路框图。所述液晶显示器驱动电路10包括动态背光控制(Content Adaptive Brightness Control，CABC)电路100及Gamma电压调整电路300。所述动态背光控制电路100用于调整液晶显示器中背光模组的亮度，当所述动态背光控制电路100开启时，所述动态背光控制电路100控制所述背光模组的亮度由第一背光亮度变为第二背光亮度，其中，所述第一背光亮度的亮度大于所述第二背光亮度的亮度。即，当所述动态背光控制电路100开启时，所述动态背光控制电路100将背光模组的亮度降低，即，降低了背光模组的功耗。当所述背光模组的亮度为所述第一背光亮度时，所述Gamma电压调整电路300输出第一Gamma电压以调整所述液晶显示器的灰阶亮度为第一灰阶亮度。当所述背光模组的亮度为所述第二背光亮度时，所述Gamma电压调整电路300输出第二Gamma电压以调整所述液晶显示器的灰阶亮度为第二灰阶亮度。其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。
在本实施方式中，所述Gamma电压调整电路300包括Gamma曲线反馈单元310、控制单元320、存储单元330及Gamma电压输出单元340。所述Gamma曲线反馈单元310用于侦测所述背光模组的亮度变化时所述液晶显示器的灰阶亮度，当所述背光模组的亮度由第一背光亮度调整为第二背光亮度时，所述Gamma曲线反馈单元310侦测到所述液晶显示器的灰阶亮度为所述第二灰阶亮度，并将所述第二灰阶亮度传输至所述控制单元320。所述控制单元320根据所述第二灰阶亮度从所述存储单元330中调取所述第二灰阶亮度对应的所述第二Gamma电压，并将所述第二Gamma电压经由所述Gamma控制单元340输出。
所述存储单元330中预先存储有各个灰阶亮度及各个灰阶对应的Gamma 电压，各个灰阶和各个灰阶对应的Gamma电压可以以但不限于以列表的形式存储于所述存储单元中。对于存储在所述存储单元330中的不同的Gamma电压而言，每个Gamma电压对应的灰阶亮度与所述灰阶对应的当前背光模组的背光亮度的产生出的画面的亮度为固定不变的。
在本实施方式中，所述Gamma电压调整电路300还包括线缓冲器(Line Buffer)350及数模转换器(D/A Converter)360。所述线缓冲器350用于接收RGB子像素串行灰阶信号，并将所述RGB子像素灰阶信号转换为RGB子像素并行灰阶信号，其中，所述RGB子像素串行灰阶信号为串行信号，所述RGB子像素并行灰阶信号为并行信号。所述数模转换器360用于根据所述RGB子像素并行灰阶信号将所述Gamma电压输出单元产生的模拟Gamma电压转换为数字Gamma电压，并将所述数字Gamma信号输出至所述液晶显示器中的相应像素电极。
在本实施方式中，所述Gamma电压调整电路300还包括升压单元(Level Shifter)370。所述升压单元370用于接收所述RGB子像素并行灰阶信号，并将所述RGB子像素并行灰阶信号的电压升高之后输出给所述数模转换器360。经过所述升压单元370升压后的RGB子像素并行灰阶信号，以便所述数模转换器360能够更精确地根据所述RGB子像素并行灰阶信号选择所述Gamma电压输出单元340中产生的多个模拟Gamma电压中的一个模拟Gamma电压信号。
在本实施方式中，所述Gamma电压调整电路300还包括缓冲单元(Buffer)380。所述缓冲单元380用于将所述数字Gamma信号缓冲预设时间后输出至所述液晶显示器中的相应像素电极。
在本实施方式中，当所述动态背光控制电路100关闭时，所述液晶显示器中的背光模组的亮度不变，因此，当所述动态背光控制电路关闭时，所述Gamma电压调整电路300不工作，即，所述Gamma电压调整电路300输出的Gamma电压不变。
相较于现有技术，本发明的液晶显示器驱动电路10中的动态背光控制电路100开启时，所述背光模组的亮度由第一背光亮度降低为第二背光亮度。此时，所述Gamma电压调整电路300调整输出的Gamma电压，当所述背光模 组的亮度为第一背光亮度时，所述Gamma电压调整电路300输出第一Gamma电压以调整所述液晶显示器的灰阶两对为第一灰阶亮度。当所述背光模组的亮度为第二背光亮度时，所述Gamma电压调整电路300输出第二Gamma电压以调整所述液晶显示器的亮度为第二灰阶亮度。其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。从而在降低所述背光模组的功耗的同时，使得所述液晶显示装置输出的画面的亮度不变，不影响画面的观看效果。
本发明还提供了一种液晶显示装置，请一并参阅图4，图4为本发明一较佳实施方式的液晶显示装置的电路框图。所述液晶显示装置1包括液晶显示器30和液晶显示器驱动电路10。所述液晶显示器驱动电路10请参阅前述描述，在此不再赘述。在本实施方式中，所述液晶显示装置1包括但不仅限于包括但不仅限于智能手机(Smart Phone)、互联网设备(Mobile Internet Device，MID)、电子书、平板电脑、便携式播放站(Play Station Portable，PSP)或者个人数字助理(Personal Digital Assistant，PDA)等便携式设备。
以上所揭露的仅为本发明一种较佳实施例而已，当然不能以此来限定本发明之权利范围，本领域普通技术人员可以理解实现上述实施例的全部或部分流程，并依本发明权利要求所作的等同变化，仍属于发明所涵盖的范围。

Claims (10)

  1. 一种液晶显示器驱动电路，其中，所述液晶显示器驱动电路包括动态背光控制电路及Gamma电压调整电路，所述动态背光控制电路用于调整液晶显示器中背光模组的亮度，当所述动态背光控制电路开启时，所述动态背光控制电路控制所述背光模组的亮度由第一背光亮度变为第二背光亮度，其中，所述第一背光亮度的亮度大于所述第二背光亮度的亮度，当所述背光模组的亮度为所述第一背光亮度时，所述Gamma电压调整电路输出第一Gamma电压以调整所述液晶显示器的灰阶亮度为第一灰阶亮度，当所述背光模组的亮度为所述第二背光亮度时，所述Gamma电压调整电路输出第二Gamma电压以调整所述液晶显示器的灰阶亮度为第二灰阶亮度，其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。
  2. 如权利要求1所述的液晶显示器驱动电路，其中，所述Gamma电压调整电路包括Gamma曲线反馈单元、控制单元、存储单元及Gamma电压输出单元，所述Gamma曲线反馈单元用于侦测所述背光模组的亮度由第一背光亮度调整为第二背光亮度时所述液晶显示器的灰阶亮度为所述第二灰阶亮度，并将所述第二灰阶亮度传输至所述控制单元，所述控制单元根据所述第二灰阶亮度从所述存储单元中调取所述第二灰阶亮度对应的所述第二Gamma电压，并将所述第二Gamma电压经由所述Gamma控制单元输出。
  3. 如权利要求2所述的液晶显示器驱动电路，其中，所述Gamma电压调整电路还包括线缓冲器及数模转换器，所述线缓冲器用于接收RGB子像素串行灰阶信号，并将所述RGB子像素灰阶信号转换为RGB子像素并行灰阶信号，其中，所述RGB子像素串行灰阶信号为串行信号，所述RGB子像素并行灰阶信号为并行信号，所述数模转换器用于根据所述RGB子像素并行灰阶信号将 所述Gamma电压输出单元产生的模拟Gamma电压转换为数字Gamma电压，并将所述数字Gamma信号输出至所述液晶显示器中的相应像素电极。
  4. 如权利要求3所述的液晶显示器驱动电路，其中，所述Gamma电压调整电路还包括升压单元，所述升压单元用于接收所述RGB子像素并行灰阶信号，并将所述RGB子像素并行灰阶信号的电压升高之后输出给所述数模转换器。
  5. 如权利要求1所述的液晶显示器驱动电路，其中，当所述动态背光控制电路关闭时，所述液晶显示器中的背光模组的亮度不变，当所述动态背光控制电路关闭时，所述Gamma电压调整电路不工作。
  6. 一种液晶显示装置，其中，所述液晶显示器包括液晶显示器及液晶显示器驱动电路，所述液晶显示器驱动电路包括动态背光控制电路及Gamma电压调整电路，所述动态背光控制电路用于调整液晶显示器中背光模组的亮度，当所述动态背光控制电路开启时，所述动态背光控制亮度控制所述背光模组的亮度由第一背光亮度变为第二背光亮度，其中，所述第一背光亮度的亮度大于所述第二背光亮度的亮度，当所述背光模组的亮度为所述第一背光亮度时，所述Gamma电压调整电路输出第一Gamma电压以调整所述液晶显示器的灰阶亮度为第一灰阶亮度，当所述背光模组的亮度为所述第二背光亮度时，所述Gamma电压调整电路输出第二Gamma电压以调整所述液晶显示器的灰阶亮度为第二灰阶亮度，其中，所述第二灰阶亮度的亮度大于所述第一灰阶亮度的亮度，且当所述液晶显示器的灰阶亮度为第二灰阶亮度且所述背光模组的亮度为第二背光亮度时的所述液晶显示器输出的画面的亮度等于所述液晶显示器的灰阶亮度为第一灰阶亮度且所述背光模组的亮度为第一背光亮度时的所述液晶显示器输出画面的亮度。
  7. 如权利要求6所述的液晶显示装置，其中，所述Gamma电压调整电路包括Gamma曲线反馈单元、控制单元、存储单元及Gamma电压输出单元， 所述Gamma曲线反馈单元用于侦测所述背光模组的亮度由第一背光亮度调整为第二背光亮度时所述液晶显示器的灰阶亮度为所述第二灰阶亮度，并将所述第二灰阶亮度传输至所述控制单元，所述控制单元根据所述第二灰阶亮度从所述存储单元中调取所述第二灰阶亮度对应的所述第二Gamma电压，并将所述第二Gamma电压经由所述Gamma控制单元输出。
  8. 如权利要求7所述的液晶显示装置，其中，所述Gamma电压调整电路还包括线缓冲器及数模转换器，所述线缓冲器用于接收RGB子像素串行灰阶信号，并将所述RGB子像素灰阶信号转换为RGB子像素并行灰阶信号，其中，所述RGB子像素串行灰阶信号为串行信号，所述RGB子像素并行灰阶信号为并行信号，所述数模转换器用于根据所述RGB子像素并行灰阶信号将所述Gamma电压输出单元产生的模拟Gamma电压转换为数字Gamma电压，并将所述数字Gamma信号输出至所述液晶显示器中的相应像素电极。
  9. 如权利要求8所述的液晶显示装置，其中，所述Gamma电压调整电路还包括升压单元，所述升压单元用于接收所述RGB子像素并行灰阶信号，并将所述RGB子像素并行灰阶信号的电压升高之后输出给所述数模转换器。
  10. 如权利要求6所述的液晶显示装置，其中，当所述动态背光控制电路关闭时，所述液晶显示器中的背光模组的亮度不变，当所述动态背光控制电路关闭时，所述Gamma电压调整电路不工作。
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