WO2018028151A1 - 伽马参考电压产生器、产生方法以及液晶显示装置 - Google Patents

伽马参考电压产生器、产生方法以及液晶显示装置 Download PDF

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WO2018028151A1
WO2018028151A1 PCT/CN2017/071032 CN2017071032W WO2018028151A1 WO 2018028151 A1 WO2018028151 A1 WO 2018028151A1 CN 2017071032 W CN2017071032 W CN 2017071032W WO 2018028151 A1 WO2018028151 A1 WO 2018028151A1
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gamma reference
sets
reference voltage
gamma
timing control
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PCT/CN2017/071032
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English (en)
French (fr)
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何健
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深圳市华星光电技术有限公司
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Priority to US15/329,319 priority Critical patent/US10825407B2/en
Publication of WO2018028151A1 publication Critical patent/WO2018028151A1/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
    • G09G3/34—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
    • 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
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • 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
    • G09G2320/0673—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
    • 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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2018—Display of intermediate tones by time modulation using two or more time intervals

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a gamma reference voltage generator and a gamma reference voltage generating method for a liquid crystal display, and a corresponding liquid crystal display device.
  • TFT-LCD Thin Film Transistor Liquid Crystal Display
  • FIG. 1 is a view showing a circuit for generating a gamma reference voltage in a conventional liquid crystal display and supplying it to a display panel.
  • the gamma reference voltage is typically generated by a single gamma chip 10 and then supplied to a source driver circuit 20, which will contain image information based on the received gamma reference voltage.
  • the digital signal is converted into an analog signal, and then the analog signal is transmitted to each sub-pixel unit of the panel 30 through the data line, and each sub-pixel unit emits light to display a corresponding image.
  • the gamma reference voltage is generated by a single gamma chip, which determines that the sub-pixel units of three different colors of red, green, and blue must share a set of gamma reference voltages.
  • the present invention provides a new gamma reference voltage generator and a method for generating the same, and a corresponding liquid crystal display device, aiming to generate multiple sets of gamma reference without increasing the number of gamma chips. Voltage to mention l Display quality of LCD monitors.
  • the gamma reference voltage generator provided by the present invention includes:
  • a programmable gamma chip electrically connected to the timing control module, configured to generate corresponding sets of gamma reference voltages according to data representing the plurality of sets of gamma reference voltage values under control of the timing control module;
  • a multiplexer module electrically connected to the timing control module and the programmable gamma chip for selectively turning on a corresponding channel according to the multi-channel control signal output by the timing control module,
  • a set of gamma reference voltage outputs of the plurality of sets of gamma reference voltages received at the horse chip are provided to corresponding sub-pixel units of the display device.
  • the timing control module has a built-in memory unit for storing data characterizing a plurality of sets of gamma reference voltage values.
  • the programmable gamma chip in the gamma reference voltage generator, the programmable gamma chip generates corresponding sets of gamma reference voltages according to data characterizing the sets of gamma reference voltage values in a time division manner.
  • the multi-channel control signal output by the timing control module is two digital signals, so as to control the multi-way gating module to output three sets of gamma in time division.
  • the reference voltage is supplied to the red, green, and blue sub-pixel units, respectively.
  • the gamma reference voltage generator further includes:
  • a voltage holding circuit comprising a voltage stabilizing branch having the same number of channels as the multi-way gating module, each of the stabilizing branches comprising a storage capacitor and a voltage follower, the input end of the storage capacitor being electrically connected An output end of a channel of the multi-way gating module, an output end of the storage capacitor is electrically connected to an input end of the voltage follower, and an output end of the voltage follower is electrically connected to a source driving circuit of the display device The corresponding input of the sub-pixel unit.
  • the present invention also provides a method for generating a gamma reference voltage by the above gamma reference voltage generator, comprising the following steps:
  • the programmable gamma chip Under the control of the timing control module, the programmable gamma chip generates corresponding sets of gamma reference voltages according to data representing the plurality of sets of gamma reference voltage values;
  • the multi-way gating module receives the plurality of sets of gamma reference voltages generated by the programmable gamma chip;
  • the multi-way gating module selectively turns on a channel according to the multi-channel control signal, and outputs a set of gamma reference voltages of the plurality of sets of gamma reference voltages to the display.
  • Corresponding sub-pixel unit of the device Whenever the timing control module outputs a multi-channel control signal, the multi-way gating module selectively turns on a channel according to the multi-channel control signal, and outputs a set of gamma reference voltages of the plurality of sets of gamma reference voltages to the display. Corresponding sub-pixel unit of the device.
  • the programmable gamma chip is characterized by time-division according to the plurality of sets of gamma references The data of the voltage values produces corresponding sets of gamma reference voltages.
  • the multi-channel control signal output by the timing control module is two digital signals, so as to control the multi-way gating module to output three sets of gamma reference voltages in time, respectively, and provide them to red and green respectively. , blue sub-pixel unit.
  • the present invention provides a liquid crystal display comprising the above gamma reference voltage generator.
  • the invention is based on multi-channel time division multiplexing usage, and uses a timing control module and a multi-way gating module to work with a single programmable gamma chip to generate multiple sets of gamma reference voltages in one batch and provide them to corresponding sub-pixels.
  • the unit realizes independent control of the gamma reference voltage of the sub-pixel unit, and can adjust the gray point white point coordinate by adjusting the gamma reference voltage of the sub-pixel unit, thereby improving the overall color expression of the liquid crystal display panel.
  • the circuit structure of the present invention is relatively simple, easy to maintain, and cost effective compared to the prior art technique employing multiple gamma chips.
  • FIG. 1 is a schematic structural diagram of a circuit for generating a gamma reference voltage in a conventional liquid crystal display
  • FIG. 2 is a schematic circuit diagram of a gamma reference voltage generator according to an embodiment of the present invention
  • 3a and 3b are schematic diagrams of gamma reference voltage generator multiplexed gates provided by an embodiment of the present invention.
  • Embodiment 1 is a diagrammatic representation of Embodiment 1:
  • FIG. 2 is a schematic diagram showing the circuit structure of a gamma reference voltage generator provided by an embodiment of the present invention.
  • the device mainly includes a timing control module 110, a digital programmable gamma chip 120, and a multi-way gating module 130. Furthermore, in order to maintain the voltage of the analog signal at the input of the source driver circuit, in the present embodiment, the device preferably also includes a voltage hold circuit 140. among them:
  • the timing control module 110 is a timing control chip mainly used to provide timing control signals.
  • the timing control chip preferably further includes a storage unit (not shown), such as a flash memory, for storing data information characterizing the plurality of sets of gamma reference voltage values.
  • the programmable gamma chip 120 is a digitally programmable gamma chip.
  • the input end 121 of the chip is electrically connected to an output end 111 of the timing control module 110 to receive data information representing the plurality of sets of gamma reference voltage values output by the timing control module 110, preferably in a time division manner, before the panel starts displaying, according to The data generates corresponding sets of gamma reference voltages and then outputs.
  • the multiplexer module 130 is a digital multiplexer chip.
  • the input end 131 of the chip is electrically connected to the output end 122 of the programmable gamma chip 120 to receive the plurality of sets of gamma reference voltages output by the programmable gamma chip 120, and the control end 132 of the chip is electrically connected to the timing control module 110.
  • the other output terminal 112 receives the multi-channel control signal output by the timing control module 110.
  • the multiplexer module 130 can selectively turn on the corresponding channel according to the multiple control signals output by the timing control module 110, among the multiple sets of gamma reference voltages received from the programmable gamma chip 120.
  • a set of gamma reference voltage outputs are provided to corresponding sub-pixel units of the display device.
  • the multi-channel control signal output by the timing control module 110 is two digital signals, so as to control the multi-way gating module 130 to output three sets of gamma reference voltages in time, respectively, and provide the red, green, and blue sub-pixels respectively. unit.
  • the timing control module needs to output at least three control signals to control the multi-way gating module to turn on one of the eight channels.
  • the voltage hold circuit 140 is mainly composed of a voltage stabilizing branch having the same number of channels as the multi-way gating module 130.
  • Each of the voltage stabilizing branches includes a storage capacitor 141 and a voltage follower 142.
  • the input end of the storage capacitor 141 is electrically connected to the output end of one channel of the multi-way gating module 130.
  • the output end of the storage capacitor 141 is electrically connected to the input end of the voltage follower 142, and the output end of the voltage follower 142 is electrically connected to the source of the display device.
  • the input of the corresponding sub-pixel unit of the pole drive circuit 210 The input of the corresponding sub-pixel unit of the pole drive circuit 210.
  • the storage capacitor 141 in the voltage hold circuit 140 can be charged to the corresponding gamma reference. Voltage.
  • the voltage at the input terminal of the source driver circuit 140 can be kept stable.
  • Embodiment 2 is a diagrammatic representation of Embodiment 1:
  • the timing control module outputs two digital signals
  • the multi-way gating module controls the time division to output three sets of gamma reference voltages, respectively, and provides them to the red, green, and blue sub-pixel units as an example for description.
  • the timing control module outputs two control signals EM0, EM1 to the control terminal of the multi-way gating module. among them:
  • the multiplexer module When EM0 and EM1 are both low, the multiplexer module has no channel conduction. Typically, this state continues until the multiplexer module receives all of the gamma reference voltages from the programmable gamma chip, such as three sets of gamma reference voltages for the red, green, and blue sub-pixel units, respectively.
  • the multiplexer module When EM0 is low and EM1 is high, the multiplexer module only turns on the R channel corresponding to the red sub-pixel unit, and sets a group of gamma corresponding to the red sub-pixel unit among the three sets of gamma reference voltages.
  • the horse reference voltage is passed to the R input of the corresponding red sub-pixel unit of the source driver circuit. Accordingly, the capacitors C r1 . . . C rn are charged to the respective gamma reference voltages, thereby maintaining the voltage at the R input terminal at the corresponding gamma reference voltage value.
  • the multiplexer module When EM0 is high level and EM1 is low level, the multiplexer module only turns on the G channel corresponding to the green sub-pixel unit, and sets a group of gamma corresponding to the green sub-pixel unit among the three groups of gamma reference voltages.
  • the horse reference voltage is passed to the G input of the corresponding green sub-pixel unit of the source drive circuit. Accordingly, the capacitors C g1 . . . C gn are charged to the respective gamma reference voltages, thereby maintaining the voltage at the G input terminal at the corresponding gamma reference voltage value.
  • the multiplexer module When EM0 is high level and EM1 is high level, the multiplexer module only turns on the B channel corresponding to the blue sub-pixel unit, and one of the three sets of gamma reference voltages corresponding to the blue sub-pixel unit The set of gamma reference voltages is passed to the B input of the corresponding red sub-pixel unit of the source drive circuit. Accordingly, the capacitors C b1 . . . C bn are charged to the respective gamma reference voltages to maintain the voltage at the B input terminal at the corresponding gamma reference voltage value.
  • the multi-way gating module turns off all channels, and the panel displays corresponding images.
  • the present invention also provides a liquid crystal display device in which the above-described gamma reference voltage generator is disposed, and a gamma reference voltage is generated by the gamma reference voltage generating method, and is supplied to a corresponding sub-pixel unit.

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  • Physics & Mathematics (AREA)
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Abstract

一种伽马参考电压产生器、产生方法以及相应的液晶显示装置。伽马参考电压产生器包括时序控制模块（110）；可编程伽马芯片（120），其电连接时序控制模块（110）；多路选通模块（130），其电连接时序控制模块（110）和可编程伽马芯片（120）。该伽马参考电压产生器能够实现对液晶显示装置的亚像素单元的伽马参考电压的独立控制，进而提高画面的显示品质。

Description

伽马参考电压产生器、产生方法以及液晶显示装置
本申请要求享有2016年8月11日提交的名称为“伽马参考电压产生器、产生方法以及液晶显示装置”的中国专利申请CN201610659395.5的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，尤其涉及一种用于液晶显示器的伽马参考电压产生器和伽马参考电压产生方法，以及相应的液晶显示装置。
背景技术
随着显示技术的发展，薄膜晶体管液晶显示器(Thin Film Transistor Liquid Crystal Display，简称TFT-LCD)已经成为了现代IT、视讯产品中重要的显示装置。
液晶显示器的阵列基板上排布有多个像素单元，每个像素单元通常至少由红色(R)、绿色(G)、蓝色(B)三种不同颜色的亚像素单元组成。其中，每个亚像素单元所呈现的亮度由伽马(Gamma)参考电压所决定。图1示出了目前现有液晶显示器中产生伽马参考电压并提供给显示面板的电路的示意图。从图1中可以看出，伽马参考电压通常由单颗的伽马芯片10产生，然后被提供给源极驱动电路20，源极驱动电路基于接收到的伽马参考电压将包含影像信息的数字信号转换为模拟信号，然后将模拟信号通过数据线传给面板30的各亚像素单元，各亚像素单元由此发光而显示相应的影像。在此，伽马参考电压仅由单颗的伽马芯片产生，这就决定了红、绿、蓝三种不同颜色的亚像素单元必须共用一组伽马参考电压。虽然这种设计方案的电路结构相对简单，但是存在以下缺陷：
1)不能分别校正红、绿、蓝三种不同颜色的亚像素单元的亮度；
2)不能通过调整伽马参考电压来校正灰阶的白点坐标，不利于提升面板的显示性能。
发明内容
为了解决上述问题，本发明提供了一种新的伽马参考电压产生器及其产生方法，以及相应的液晶显示装置，旨在在不增加伽马芯片数量的前提下，产生多组伽马参考电压来提 升液晶显示器的显示品质。
本发明提供的伽马参考电压产生器，其包括：
时序控制模块；
可编程伽马芯片，其电连接所述时序控制模块，用于在所述时序控制模块的控制下，根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压；
多路选通模块，其电连接所述时序控制模块和可编程伽马芯片，用于根据所述时序控制模块输出的多路控制信号选择性地开启相应的通道，将从所述可编程伽马芯片处接收的多组伽马参考电压中的一组伽马参考电压输出，提供给显示器件的对应的亚像素单元。
根据本发明的实施例，在上述伽马参考电压产生器中，所述时序控制模块内置有存储单元，用于存储表征多组伽马参考电压值的数据。
根据本发明的实施例，在上述伽马参考电压产生器中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
根据本发明的实施例，在上述伽马参考电压产生器中，所述时序控制模块输出的多路控制信号为两路数字信号，以便控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
根据本发明的实施例，在上述伽马参考电压产生器中还包括：
电压保持电路，其包括与所述多路选通模块的通道数量相同的稳压支路，每一所述稳压支路包括存储电容和电压跟随器，所述存储电容的输入端电连接所述多路选通模块的一通道的输出端，所述存储电容的输出端电连接所述电压跟随器的输入端，所述电压跟随器的输出端电连接所述显示器件的源极驱动电路的对应的亚像素单元的输入端。
此外，本发明还提供一种通过上述伽马参考电压产生器来产生伽马参考电压的方法，包括以下步骤：
在时序控制模块的控制下，可编程伽马芯片根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压；
多路选通模块接收可编程伽马芯片产生的多组伽马参考电压；
每当时序控制模块输出一多路控制信号，多路选通模块根据该多路控制信号选择性的开启一通道，将多组伽马参考电压中的一组伽马参考电压输出，提供给显示器件的对应的亚像素单元。
根据本发明的实施例，优选地，可编程伽马芯片以时分的方式根据表征多组伽马参考 电压值的数据产生对应的多组伽马参考电压。
根据本发明的实施例，优选地，时序控制模块输出的多路控制信号为两路数字信号，以便控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
此外，本发明还提供一种液晶显示器，其包括上述伽马参考电压产生器。
本发明带来了以下有益效果：
本发明基于多路时分复用法，利用时序控制模块和多路选通模块与单颗的可编程伽马芯片配合工作，一批次地产生多组伽马参考电压，提供给对应的亚像素单元，实现对亚像素单元的伽马参考电压独立控制，而且可以通过调整亚像素单元的伽马参考电压来调整灰阶白点坐标，提升液晶显示面板整体的色彩表现力。此外，相比于现有技术中采用多颗伽马芯片的技术，本发明的电路结构相对简单，容易维护，并且节省成本。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分的从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚的说明本发明实施例中的技术方案，下面将对实施例描述中所需要的附图做简单的介绍：
图1是现有的液晶显示器中产生伽马参考电压的电路结构示意图；
图2是本发明的实施例所提供的伽马参考电压产生器的电路结构示意图；
图3a和3b是本发明的实施例所提供的伽马参考电压产生器多路选通的示意图。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
实施例一：
图2本发明的实施例所提供的伽马参考电压产生器的电路结构示意图。由图2可知， 该装置主要包括时序控制模块110、数字可编程伽马芯片120和多路选通模块130。此外，为了在源极驱动电路的输入端维持模拟信号的电压，在本实施例中，该装置还优选地包括电压保持电路140。其中：
时序控制模块110为一时序控制芯片，主要用来提供时序控制信号。此外，在本实施例中，该时序控制芯片中还优选地内置有存储单元(图中未示出)，例如闪存Flash，用来存储表征多组伽马参考电压值的数据信息。
可编程伽马芯片120为一数字可编程伽马芯片。该芯片的输入端121电连接时序控制模块110的一个输出端111，以在面板开始显示前，优选以时分的方式接收时序控制模块110输出的表征多组伽马参考电压值的数据信息，根据所述数据产生对应的多组伽马参考电压，然后输出。
多路选通模块130为一数字多路选通芯片。该芯片的输入端131电连接可编程伽马芯片120的输出端122，以接收可编程伽马芯片120输出的多组伽马参考电压，同时该芯片的控制端132电连接时序控制模块110的另一输出端112，以接收时序控制模块110输出的多路控制信号。通过这种设计，多路选通模块130可以根据时序控制模块110输出的多路控制信号选择性地开启相应的通道，将从可编程伽马芯片120处接收的多组伽马参考电压中的一组伽马参考电压输出，以提供给显示器件的对应的亚像素单元。
在本实施例中，时序控制模块110输出的多路控制信号为两路数字信号，以便控制多路选通模块130分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。当然，在实际应用时可以不限于此。例如，当多路选通模块具有八个通道时，时序控制模块需要输出至少三路控制信号来控制多路选通模块，以便开启八个通道中的一个通道。
电压保持电路140主要由与多路选通模块130的通道数量相同的稳压支路组成。其中，每一个稳压支路均包括一存储电容141和一电压跟随器142。存储电容141的输入端电连接多路选通模块130的一通道的输出端，存储电容141的输出端电连接电压跟随器142的输入端，电压跟随器142的输出端电连接显示器件的源极驱动电路210的对应的亚像素单元的输入端。当多路选通模块130输出的一组伽马参考电压经由电压保持电路140传至源极驱动电路140的输入端时，电压保持电路140中的存储电容141能够被充电至相应的伽马参考电压。由此，即使在多路选通模块130断开其输出通道的情况下，源极驱动电路140的输入端的电压也能够保持稳定。具体的工作原理可以参见下面实施例二的说明。
实施例二：
下面结合图3进一步说明上述伽马参考电压产生器的工作原理。在此，仅以时序控制模块输出两路数字信号，控制多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元为例进行说明。
如图3a和3b所示，时序控制模块输出两路控制信号EM0，EM1到多路选通模块的控制端。其中：
当EM0、EM1均为低电平时，多路选通模块无通道导通。通常，这种状态会一直持续到多路选通模块从可编程伽马芯片处接收完所有的伽马参考电压，例如分别用于红、绿、蓝亚像素单元的三组伽马参考电压。
当EM0为低电平、EM1为高电平时，多路选通模块仅导通对应于红色亚像素单元的R通道，将三组伽马参考电压中的对应于红色亚像素单元的一组伽马参考电压传给源极驱动电路的对应的红色亚像素单元的R输入端。相应地，电容Cr1……Crn被充电至相应的伽马参考电压，从而将R输入端的电压维持在相应的伽马参考电压值。
当EM0为高电平、EM1为低电平时，多路选通模块仅导通对应于绿色亚像素单元的G通道，将三组伽马参考电压中的对应于绿色亚像素单元的一组伽马参考电压传给源极驱动电路的对应的绿色亚像素单元的G输入端。相应地，电容Cg1……Cgn被充电至相应的伽马参考电压，从而将G输入端的电压维持在相应的伽马参考电压值。
当EM0为高电平、EM1为高电平时，多路选通模块仅导通对应于蓝色亚像素单元的B通道，将三组伽马参考电压中的对应于蓝色亚像素单元的一组伽马参考电压传给源极驱动电路的对应的红色亚像素单元的B输入端。相应地，电容Cb1……Cbn被充电至相应的伽马参考电压，从而将B输入端的电压维持在相应的伽马参考电压值。
如此，当对应于红、绿、蓝亚像素单元的三组伽马参考电压全部输入完毕后，多路选通模块关闭所有通道，而面板显示相应的影像。
在此需要说明的是，虽然上述实施例以常见的RGB亚像素单元为例，但是同样地适用于其他的显示方式的亚像素单元，例如对WRGB亚像素单元等也同样适用。
此外，本发明还提供了一种液晶显示装置，其内部设置有上述伽马参考电压产生器，并通过上述伽马参考电压产生方法产生伽马参考电压，提供给对应的亚像素单元。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (20)

  1. 一种伽马参考电压产生器，包括：
    时序控制模块；
    可编程伽马芯片，其电连接所述时序控制模块，用于在所述时序控制模块的控制下，根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压；
    多路选通模块，其电连接所述时序控制模块和可编程伽马芯片，用于根据所述时序控制模块输出的多路控制信号选择性地开启相应的通道，将从所述可编程伽马芯片处接收的多组伽马参考电压中的一组伽马参考电压输出，提供给显示器件的对应的亚像素单元。
  2. 根据权利要求1所述的伽马参考电压产生器，其中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
  3. 根据权利要求1所述的伽马参考电压产生器，其中，所述时序控制模块输出的多路控制信号为两路数字信号，以控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
  4. 根据权利要求1所述的伽马参考电压产生器，其中，所述时序控制模块内置有存储单元，用于存储表征多组伽马参考电压值的数据。
  5. 根据权利要求4所述的伽马参考电压产生器，其中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
  6. 根据权利要求4所述的伽马参考电压产生器，其中，所述时序控制模块输出的多路控制信号为两路数字信号，以控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
  7. 根据权利要求1所述的伽马参考电压产生器，其中，还包括：
    电压保持电路，其包括与所述多路选通模块的通道数量相同的稳压支路，每一所述稳压支路包括存储电容和电压跟随器，所述存储电容的输入端电连接所述多路选通模块的一通道的输出端，所述存储电容的输出端电连接所述电压跟随器的输入端，所述电压跟随器的输出端电连接所述显示器件的源极驱动电路的对应的亚像素单元的输入端。
  8. 一种利用伽马参考电压产生器产生伽马参考电压的方法，
    所述伽马参考电压产生器包括：
    时序控制模块；
    可编程伽马芯片，其电连接所述时序控制模块，用于在所述时序控制模块的控制下，根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压；
    多路选通模块，其电连接所述时序控制模块和可编程伽马芯片，用于根据所述时序控制模块输出的多路控制信号选择性地开启相应的通道，将从所述可编程伽马芯片处接收的多组伽马参考电压中的一组伽马参考电压输出，提供给显示器件的对应的亚像素单元；
    所述方法包括以下步骤：
    在时序控制模块的控制下，可编程伽马芯片根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压；
    多路选通模块接收可编程伽马芯片产生的多组伽马参考电压；
    每当时序控制模块输出一多路控制信号，多路选通模块根据该多路控制信号选择性的开启一通道，将多组伽马参考电压中的一组伽马参考电压输出，提供给显示器件的对应的亚像素单元。
  9. 根据权利要求8所述的方法，其中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
  10. 根据权利要求8所述的方法，其中，所述时序控制模块输出的多路控制信号为两路数字信号，以控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
  11. 根据权利要求8所述的方法，其中，所述时序控制模块内置有存储单元，用于存储表征多组伽马参考电压值的数据。
  12. 根据权利要求11所述的方法，其中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
  13. 根据权利要求11所述的方法，其中，所述时序控制模块输出的多路控制信号为两路数字信号，以控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
  14. 根据权利要求8所述的方法，其中，还包括：
    电压保持电路，其包括与所述多路选通模块的通道数量相同的稳压支路，每一所述稳压支路包括存储电容和电压跟随器，所述存储电容的输入端电连接所述多路选通模块的一通道的输出端，所述存储电容的输出端电连接所述电压跟随器的输入端，所述电压跟随器的输出端电连接所述显示器件的源极驱动电路的对应的亚像素单元的输入端。
  15. 一种液晶显示器，其包括伽马参考电压产生器；其中，所述伽马参考电压产生器包括：
    时序控制模块；
    可编程伽马芯片，其电连接所述时序控制模块，用于在所述时序控制模块的控制下，根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压；
    多路选通模块，其电连接所述时序控制模块和可编程伽马芯片，用于根据所述时序控制模块输出的多路控制信号选择性地开启相应的通道，将从所述可编程伽马芯片处接收的多组伽马参考电压中的一组伽马参考电压输出，提供给显示器件的对应的亚像素单元。
  16. 根据权利要求15所述的液晶显示器，其中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
  17. 根据权利要求15所述的液晶显示器，其中，所述时序控制模块输出的多路控制信号为两路数字信号，以控制所述多路选通模块分时输出三组伽马参考电压，分别提供给红、绿、蓝亚像素单元。
  18. 根据权利要求15所述的液晶显示器，其中，所述时序控制模块内置有存储单元，用于存储表征多组伽马参考电压值的数据。
  19. 根据权利要求18所述的液晶显示器，其中，所述可编程伽马芯片以时分的方式根据表征多组伽马参考电压值的数据产生对应的多组伽马参考电压。
  20. 根据权利要求15所述的液晶显示器，其中，还包括：
    电压保持电路，其包括与所述多路选通模块的通道数量相同的稳压支路，每一所述稳压支路包括存储电容和电压跟随器，所述存储电容的输入端电连接所述多路选通模块的一通道的输出端，所述存储电容的输出端电连接所述电压跟随器的输入端，所述电压跟随器的输出端电连接所述显示器件的源极驱动电路的对应的亚像素单元的输入端。
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