WO2018014372A1 - 源极驱动模块以及液晶显示装置 - Google Patents

源极驱动模块以及液晶显示装置 Download PDF

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Publication number
WO2018014372A1
WO2018014372A1 PCT/CN2016/093005 CN2016093005W WO2018014372A1 WO 2018014372 A1 WO2018014372 A1 WO 2018014372A1 CN 2016093005 W CN2016093005 W CN 2016093005W WO 2018014372 A1 WO2018014372 A1 WO 2018014372A1
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Prior art keywords
switch
gamma voltage
turned
control signal
data
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PCT/CN2016/093005
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English (en)
French (fr)
Inventor
黄笑宇
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深圳市华星光电技术有限公司
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Priority to US15/125,159 priority Critical patent/US10192510B2/en
Publication of WO2018014372A1 publication Critical patent/WO2018014372A1/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
    • G09G3/3611—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
    • 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
    • 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
    • G09G3/3685—Details of drivers for data electrodes
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2320/00—Control of display operating conditions
    • G09G2320/02—Improving the quality of display appearance
    • G09G2320/0242—Compensation of deficiencies in the appearance of colours
    • 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 display technologies, and in particular, to a source driving module and a liquid crystal display device including the source driving module.
  • Liquid Crystal Display is a flat ultra-thin display device consisting of a certain number of color or black-and-white pixels placed in front of a light source or a reflective surface. LCD monitors have low power consumption and are characterized by high image quality, small size, and light weight. Therefore, they are favored by everyone and become the mainstream of displays.
  • the liquid crystal display is mainly a Thin Film Transistor (TFT) liquid crystal display, and the liquid crystal panel is a main component of the liquid crystal display.
  • the liquid crystal panel generally includes a color film substrate and a TFT array substrate disposed opposite to each other and sandwiched between the two substrates. Liquid crystal layer.
  • the driving of the liquid crystal display device is that the gate driving module and the source driving module respectively supply scanning signals and data signals to the respective sub-pixels in the display panel, and the voltage difference between different data signal voltages and the common electrode voltage causes the liquid crystal body to rotate.
  • the difference is to form a difference in brightness, that is, the display of the liquid crystal panel forms a different gray scale.
  • the source driving module includes a gamma voltage generating unit and a data driving unit, the gamma voltage generating unit generates and outputs a gamma voltage, the data driving unit receives the gamma voltage, and according to the gamma The voltage produces a corresponding data signal to provide a display panel.
  • the pixel unit in the display panel has two common sub-pixel arrangement modes: “horizontal arrangement” and “vertical arrangement”. Taking a display panel including only three sub-pixels of red sub-pixel R, green sub-pixel G, and blue sub-pixel B as an example, as shown in FIG. 1 , “sub-pixel horizontal arrangement” corresponds to “single scan line (Gate) three data. “Data” drive, referred to as “1G3D” mode; as shown in Figure 2, “sub-pixel vertical alignment” corresponds to "three scan line (Gate) single data line (Data) drive", referred to as "3G1D” mode .
  • the gate driving module 1 scans line by line, and the data driving unit 2b according to the gamma
  • the same gamma voltage (the same gamma curve) generated by the horse voltage generating unit 2a supplies data signals to sub-pixels of different colors.
  • the above data signal driving method is based on the same gamma curve line by line When sub-pixels of different colors are charged, there is a problem that the charging of some sub-pixels causes insufficient color shift, and the display quality of the display panel is lowered.
  • the present invention provides a source driving module that can generate two sets of gamma voltages, and drives sub-pixels of the same column in the display panel according to two sets of gamma voltages, thereby effectively improving sub-pixels due to insufficient charging.
  • the color shift problem caused, especially for a display panel in which sub-pixels are vertically arranged, can improve the display quality of the display panel.
  • a source driving module for providing a data signal to a display panel, the source driving module comprising a gamma voltage generating unit and a data driving unit, the data driving unit receiving the gamma output by the gamma voltage generating unit And providing a display panel according to the voltage, and generating a corresponding data signal according to the gamma voltage, wherein the gamma voltage generating unit comprises a first gamma voltage generator and a second gamma voltage generator, the first gamma The voltage generator generates and outputs a first gamma voltage, the second gamma voltage generator generates and outputs a second gamma voltage; the source driving module further includes a voltage selection unit for selecting at the same time One of the first gamma voltage and the second gamma voltage is input to the data driving unit.
  • the voltage selection unit includes a first switch and a second switch
  • the first gamma voltage generator is connected to the data driving unit through the first switch
  • the second gamma voltage generator passes through
  • the second switch is connected to the data driving unit; at the same time, one of the first switch and the second switch is controlled to be turned on, and the first switch or the second switch corresponding to the first switch A gamma voltage or a second gamma voltage is input to the data driving unit.
  • the first switch and the second switch are connected to the same control signal, the control signal includes a first state and a second state; when the control signal is in the first state, the first switch is turned on, the first The second switch is turned off; when the control signal is in the second state, the first switch is turned off, and the second switch is turned on.
  • the first switch and the second switch are connected to the same control signal, and the control signal is a square wave signal; when the square wave signal is in a high level state, the first switch is turned on, and the second switch is Turning off; when the square wave signal is in a low state, the first switch is turned off, and the second switch is turned on.
  • the period of the square wave signal is T1
  • the period of the square wave signal is T1
  • the period of the line synchronization signal of the display panel is T2
  • T1 2 ⁇ T2
  • the duty ratio of the square wave signal is 1/2.
  • the first switch is an N-channel MOS transistor, a gate of the N-channel MOS transistor is connected to the control signal, a source is connected to the first gamma voltage generator, and a drain is connected to the data driving a second switch is a P-channel MOS transistor, a gate of the P-channel MOS transistor is connected to the control signal, a source is connected to the second gamma voltage generator, and a drain is connected to the data drive unit.
  • the data driving unit comprises a data driving chip connected to the display panel in a structure of a flip chip.
  • a liquid crystal display device including: a display panel, wherein the display panel is provided with a plurality of data lines and a plurality of scanning lines criss-crossed, and an intersection area of the data lines and the scanning lines is formed Sub-pixels, all sub-pixels of the same row are connected to the same scan line, and all sub-pixels of the same column are connected to the same data line; wherein three sub-pixels corresponding to each pixel unit are vertically arranged; the source driver module as described above, Providing a data signal to the sub-pixels in the display panel through the data line; a gate driving module, configured to provide a scan signal to the sub-pixels in the display panel through the scan line; And providing a timing control signal to the source driving module and the gate driving module, and transmitting an image signal to be displayed to the source driving module.
  • the three sub-pixels corresponding to each pixel unit are, in order, a red sub-pixel, a green sub-pixel, and a blue sub-pixel.
  • two gamma voltage generators are disposed in the source driving module to generate two sets of gamma voltages, and two sets of gamma voltages are selected by the voltage selecting unit.
  • the voltage selecting unit To the data drive unit.
  • the sub-pixels of the same column in the display panel can be driven according to the two sets of gamma voltages, thereby effectively improving the color shift problem caused by insufficient charging of the sub-pixels, especially for the display panel in which the sub-pixels are vertically arranged. Improve the display quality of the display panel.
  • the two sets of gamma voltages can share the data driver in one data driving unit, which is cost effective.
  • the provided source driver module has a simple structure and is easy to implement, and is advantageous for large-scale industrial applications.
  • FIG. 1 is an exemplary illustration of a horizontal arrangement of sub-pixels in a conventional display panel
  • FIG. 2 is an exemplary diagram of vertical alignment of sub-pixels in a conventional display panel
  • FIG. 3 is a schematic structural diagram of a liquid crystal display device according to an embodiment of the present invention.
  • FIG. 4 is a schematic structural diagram of a source driving module according to an embodiment of the present invention.
  • Figure 5 is a circuit diagram of a voltage selection unit in an embodiment of the present invention.
  • FIG. 6 is a waveform diagram of a control signal of a voltage selection unit in an embodiment of the present invention.
  • Fig. 7 is a waveform diagram of a control signal of a voltage selecting unit in another embodiment of the present invention.
  • the liquid crystal display device includes a display panel 10 , a source driving module 20 , a gate driving module 30 , and a timing controller 40 .
  • the timing controller 40 is configured to provide a timing control signal to the source driving module 20 and the gate driving module 30, and also send an image signal to be displayed to the source driving module 20.
  • the source driving module 20 generates a corresponding data signal to the display panel 10 according to the timing control signal received from the timing controller 40 and the image signal to be displayed, and the gate driving module 30 according to the slave
  • the timing control signal received by the timing controller 40 generates a corresponding scan signal for the display panel 10.
  • the display panel 10 is provided with a plurality of data lines D and a plurality of scan lines S which are criss-crossed.
  • the intersection of the data lines D and the scan lines S is formed with sub-pixels P, and all the sub-pixels P of the same row are connected to The same scan line S, all the sub-pixels P of the same column are connected to the same data line D.
  • the data line D and the scan line S and the sub-pixel P of the display panel 10 are exemplarily shown in FIG.
  • each pixel unit 10a in the display panel 10 corresponds to The three sub-pixels P are vertically arranged, and the three sub-pixels P corresponding to each pixel unit 10a are, in order, a red sub-pixel R, a green sub-pixel G, and a blue sub-pixel B.
  • a new source driving module 20 is provided for the three sub-pixels P corresponding to each pixel unit 10a to be vertically arranged.
  • the source driving module 20 includes a gamma voltage generating unit 21 and a data driving unit 22, and the data driving unit 22 receives the gamma voltage output by the gamma voltage generating unit 21, and according to the The gamma voltage produces a corresponding data signal to provide a display panel.
  • the gamma voltage generating unit 21 includes a first gamma voltage generator 211 and a second gamma voltage generator 212, and the first gamma voltage generator 211 generates and outputs a first gamma voltage, The second gamma voltage generator 212 generates and outputs a second gamma voltage.
  • the source driving module 20 further includes a voltage selecting unit 23 connected between the gamma voltage generating unit 21 and the data driving unit 22 for selecting at the same time. One of the first gamma voltage and the second gamma voltage is input to the data driving unit 22.
  • each column of sub-pixels P of the data signal is provided by the data driving unit 22, and the data driving unit 22 can drive the sub-pixels P of the same column according to the two sets of gamma voltages, thereby effectively improving the sub-pixels P of the same column.
  • the sub-pixel P can improve the display quality of the display panel due to the color shift problem caused by insufficient charging.
  • the voltage selection unit 23 includes a first switch 231 and a second switch 232, and the first gamma voltage generator 211 is connected to the data driving unit through the first switch 231. 22.
  • the second gamma voltage generator 212 is coupled to the data driving unit 22 via the second switch 232.
  • one of the first switch 231 and the second switch 232 is controlled to be turned on, and the first gamma voltage or the second gamma corresponding to the opened first switch 231 or the second switch 232 A voltage is input to the data driving unit 22.
  • the first switch 231 and the second switch 232 can be connected to the same control signal, and the first switch 231 and the second switch 232 are controlled to be turned on and off by the same control signal.
  • control signal includes a first state and a second state, when the control signal is in the first state, the first switch 231 is turned on, the second switch 232 is turned off; when the control signal is in the first In the two states, the first switch 231 is turned off and the second switch 232 is turned on.
  • the first switch 231 is an N-channel MOS transistor, the gate of the N-channel MOS transistor is connected to the control signal A, and the source is connected to the first a gamma voltage generator 211 having a drain connected to the data driving unit 22;
  • the second switch 232 being a P-channel MOS transistor, a gate of the P-channel MOS transistor being connected to the control signal A, and a source connected to
  • the second gamma voltage generator 212 has a drain connected to the data driving unit 22.
  • Control letter The number A is a square wave signal; when the square wave signal is in a high level state, the first switch 231 is turned on, the second switch 232 is turned off, and the first gamma voltage generator 211 is generated. a gamma voltage is input to the data driving unit 22; when the square wave signal is in a low level state, the first switch 231 is turned off, and the second switch 232 is turned on, at this time, by the second A second gamma voltage generated by the gamma voltage generator 212 is input to the data driving unit 22.
  • the period of the square wave signal (control signal A) is T1
  • the duty ratio of the square wave signal is 1/2.
  • the time of the period T2 of the line sync signal (HSYNC) is the scan time of each line of sub-pixels, that is, the charging time.
  • the red sub-pixel R of the first row turns on the scan signal
  • the square wave signal is in the high state H
  • the first switch 231 is turned on
  • the second switch 232 is turned off
  • the data driving unit 22 receives the first gamma.
  • the first gamma voltage generated by the horse voltage generator 211 generates a corresponding data signal and is input to the red sub-pixel R of the first row for charging;
  • the red sub-pixel R of the fourth row turns on the scan signal
  • the square wave signal is converted to the low level state L
  • the first switch 231 is turned off
  • the second switch 232 is turned on
  • the data driving unit 22 receives the second gamma.
  • the second gamma voltage generated by the horse voltage generator 212 generates a corresponding data signal input to the red sub-pixel R of the fourth row for charging.
  • the data driving unit 22 sequentially alternately generates data signals according to the first gamma voltage and the second gamma voltage for charging.
  • the red sub-pixel R, the green sub-pixel G, and the blue sub-pixel B corresponding to each pixel unit 10a there is one or two The sub-pixels are charged according to the first gamma voltage, and the other two or one are charged according to the second gamma voltage.
  • the square wave signal (control signal A) has a duty cycle of 2/3.
  • the red sub-pixel R of the first row turns on the scan signal
  • the square wave signal is in the high state H
  • the first switch 231 is turned on
  • the second switch 232 is turned off
  • the data driving unit 22 receives the first gamma.
  • the first gamma voltage generated by the horse voltage generator 211 generates a corresponding data signal and is input to the red sub-pixel R of the first row for charging;
  • the data driving unit 22 performs charging according to the first gamma voltage generating data signal, and for the blue sub-pixel in each pixel unit 10a
  • the data driving unit 22 performs charging according to the first gamma voltage generating data signal.
  • the red sub-pixel R is charged according to the second gamma voltage; or, the blue sub-pixel B and the red sub-pixel R set to each pixel unit 10a are performed according to the first gamma voltage Charging, and the green sub-pixel G in each pixel unit 10a is charged according to the second gamma voltage.
  • the data driving unit 22 includes a data driving chip, that is, a COF (Chip On Film) chip, which is connected to the display panel 10 by a flip chip structure.
  • the COF chip may be a plurality of, each COF chip corresponding to a plurality of columns of sub-pixels of different regions, each of the COF chips being respectively connected to the first gamma voltage generator 211 and the second gamma by the voltage selection unit 23 Horse voltage generator 212.
  • the source driving module and the liquid crystal display device provided by the embodiments of the present invention have two gamma voltage generators in the source driving module to generate two sets of gamma voltages, and two sets of gamma voltages are selected by the voltage selecting unit. Select one of them to input to the data drive unit.
  • the sub-pixels of the same column in the display panel can be driven according to the two sets of gamma voltages, thereby effectively improving the color shift problem caused by insufficient charging of the sub-pixels, especially for the display panel in which the sub-pixels are vertically arranged. Improve the display quality of the display panel.
  • the two sets of gamma voltages can share the data driver in one data driving unit, which is cost effective.
  • the provided source driver module has a simple structure and is easy to implement, and is advantageous for large-scale industrial applications.

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

Abstract

一种用于向显示面板(10)提供数据信号的源极驱动模块(20)以及包含该源极驱动模块(20)的液晶显示装置，所述源极驱动模块(20)包括伽马电压发生单元(21)和数据驱动单元(22)，所述数据驱动单元(22)接收所述伽马电压发生单元(21)输出的伽马电压，并根据所述伽马电压产生相应的数据信号提供给显示面板(10)，其中，所述伽马电压发生单元(21)包括第一伽马电压发生器(211)和第二伽马电压发生器(212)，所述第一伽马电压发生器(211)发生并输出第一伽马电压，所述第二伽马电压发生器(212)发生并输出第二伽马电压；所述源极驱动模块(20)还包括一电压选择单元(23)，用于在同一时刻内选择所述第一伽马电压和第二伽马电压的其中之一输入至所述数据驱动单元(22)。

Description

源极驱动模块以及液晶显示装置 技术领域
本发明涉及显示器技术领域，特别涉及一种源极驱动模块以及包含所述源极驱动模块的液晶显示装置。
背景技术
液晶显示器(Liquid Crystal Display，LCD)，为平面超薄的显示设备，它由一定数量的彩色或黑白像素组成，放置于光源或者反射面前方。液晶显示器功耗很低，并且具有高画质、体积小、重量轻的特点，因此倍受大家青睐，成为显示器的主流。目前液晶显示器是以薄膜晶体管(Thin Film Transistor，TFT)液晶显示器为主，液晶面板是液晶显示器的主要组件，液晶面板一般包括相对设置的彩膜基板和TFT阵列基板以及夹在两基板之间的液晶层。
液晶显示装置的驱动是由栅极驱动模块和源极驱动模块分别向显示面板中各个子像素提供扫描信号和数据信号的，不同的数据信号电压与共电极电压之间的压差造成液晶体旋转角度不同从而形成亮度的差异，即液晶面板的显示形成不同的灰阶。其中，源极驱动模块包括伽马电压发生单元和数据驱动单元，所述伽马电压发生单元产生并输出一伽马电压，所述数据驱动单元接收所述伽马电压，并根据所述伽马电压产生相应的数据信号提供显示面板。其中，显示面板中的像素单元有两种常见的子像素排列方式：“水平排列”和“垂直排列”。以仅含红色子像素R、绿色子像素G、蓝色子像素B三子像素的显示面板为例，如图1所示，“子像素水平排列”对应于“单扫描线(Gate)三数据线(Data)驱动”，简称为“1G3D”模式；如图2所示，“子像素垂直排列”对应于“三扫描线(Gate)单数据线(Data)驱动”，简称为“3G1D”模式。
对于子像素垂直排列的方式，每一列子像素中的红色子像素R、绿色子像素G、蓝色子像素B连接到同一数据线，栅极驱动模块1逐行扫描，数据驱动单元2b根据伽马电压发生单元2a产生的同一伽马电压(同一伽马曲线)向不同颜色的子像素提供数据信号。以上的数据信号的驱动方式，根据同一伽马曲线逐行对 不同颜色的子像素进行充电，会存在对一些子像素的充电不足引起色偏的问题，降低显示面板的显示品质。
发明内容
鉴于现有技术的不足，本发明提供了一种源极驱动模块，其可以产生两组伽马电压，根据两组伽马电压驱动显示面板中同一列的子像素，有效改善子像素因充电不足引起的色偏问题，特别是对于子像素垂直排列的显示面板，可以提高显示面板的显示品质。
为了实现上述目的，本发明采用了如下的技术方案：
一种源极驱动模块，用于向显示面板提供数据信号，所述源极驱动模块包括伽马电压发生单元和数据驱动单元，所述数据驱动单元接收所述伽马电压发生单元输出的伽马电压，并根据所述伽马电压产生相应的数据信号提供显示面板，其中，所述伽马电压发生单元包括第一伽马电压发生器和第二伽马电压发生器，所述第一伽马电压发生器发生并输出第一伽马电压，所述第二伽马电压发生器发生并输出第二伽马电压；所述源极驱动模块还包括一电压选择单元，用于在同一时刻内选择所述第一伽马电压和第二伽马电压的其中之一输入至所述数据驱动单元。
其中，所述电压选择单元包括第一开关和第二开关，所述第一伽马电压发生器通过所述第一开关连接至所述数据驱动单元，所述第二伽马电压发生器通过所述第二开关连接至所述数据驱动单元；在同一时刻内，所述第一开关和第二开关的其中之一被控制为开启，被开启的第一开关或第二开关所对应的第一伽马电压或第二伽马电压输入至所述数据驱动单元。
其中，所述第一开关和第二开关连接到同一控制信号，所述控制信号包括第一状态和第二状态；所述控制信号处于第一状态时，所述第一开关开启，所述第二开关关闭；所述控制信号处于第二状态时，所述第一开关关闭，所述第二开关开启。
其中，所述第一开关和第二开关连接到同一控制信号，所述控制信号为方波信号；所述方波信号处于高电平状态时，所述第一开关开启，所述第二开关关闭；所述方波信号处于低电平状态时，所述第一开关关闭，所述第二开关开启。
其中，所述方波信号的周期为T1，所述显示面板的行同步信号的周期为T2，T1＝3×T2；并且，所述方波信号的占空比为2/3。
其中，所述方波信号的周期为T1，所述显示面板的行同步信号的周期为T2，T1＝2×T2；所述方波信号的占空比为1/2。
其中，所述第一开关为N沟道MOS晶体管，N沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第一伽马电压发生器，漏极连接到所述数据驱动单元；所述第二开关为P沟道MOS晶体管，P沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第二伽马电压发生器，漏极连接到所述数据驱动单元。
其中，所述数据驱动单元包括以覆晶薄膜的架构连接到所述显示面板的数据驱动芯片。
本发明的另一方面是提供一种液晶显示装置，其包括：显示面板，所述显示面板中设置有纵横交错的多条数据线和多条扫描线，数据线和扫描线的交叉区域形成有子像素，同一行的所有子像素连接到同一扫描线，同一列的所有子像素连接同一数据线；其中，每一像素单元对应的三个子像素呈垂直排列；如上所述的源极驱动模块，用于通过所述数据线向所述显示面板中的子像素提供数据信号；栅极驱动模块，用于通过所述扫描线向所述显示面板中的子像素提供扫描信号；时序控制器，用于向所述源极驱动模块和所述栅极驱动模块提供时序控制信号，并且向所述源极驱动模块发送待显示的图像信号。
其中，每一像素单元对应的三个子像素依次为红色子像素、绿色子像素和蓝色子像素。
本发明实施例提供的源极驱动模块以及液晶显示装置，源极驱动模块中设置有两个伽马电压发生器产生两组伽马电压，两组伽马电压由电压选择单元选择其中之一输入到数据驱动单元。通过电压选择单元的切换选择，可以根据两组伽马电压驱动显示面板中同一列的子像素，有效改善子像素因充电不足引起的色偏问题，特别是对于子像素垂直排列的显示面板，可以提高显示面板的显示品质。进一步地，两组伽马电压可以共用一个数据驱动单元中的数据驱动器，有效地节省成本。另外，所提供的源极驱动模块结构简单，易于实现，有利于大规模的产业化应用。
附图说明
图1是现有的显示面板中子像素水平排列的示例性图示；
图2是现有的显示面板中子像素垂直排列的示例性图示；
图3是本发明实施例提供的液晶显示装置的结构示意图；
图4是本发明实施例提供的源极驱动模块的结构示意图；
图5是本发明实施例中的电压选择单元的电路图；
图6是本发明实施例中的电压选择单元的控制信号的波形图；
图7是本发明另一实施例中的电压选择单元的控制信号的波形图。
具体实施方式
为使本发明的目的、技术方案和优点更加清楚，下面结合附图对本发明的具体实施方式进行详细说明。这些优选实施方式的示例在附图中进行了例示。附图中所示和根据附图描述的本发明的实施方式仅仅是示例性的，并且本发明并不限于这些实施方式。
在此，还需要说明的是，为了避免因不必要的细节而模糊了本发明，在附图中仅仅示出了与根据本发明的方案密切相关的结构和/或处理步骤，而省略了与本发明关系不大的其他细节。
本实施例提供了一种液晶显示装置，如图3所示，所述液晶显示装置包括显示面板10、源极驱动模块20、栅极驱动模块30以及时序控制器40。其中，所述时序控制器40用于向所述源极驱动模块20和所述栅极驱动模块30提供时序控制信号，并且还向所述源极驱动模块20发送待显示的图像信号。所述源极驱动模块20根据从所述时序控制器40接收到的时序控制信号和待显示的图像信号生成相应的数据信号提供给所述显示面板10，所述栅极驱动模块30根据从所述时序控制器40接收到的时序控制信号生成相应的扫描信号提供给所述显示面板10。
其中，所述显示面板10中设置有纵横交错的多条数据线D和多条扫描线S，数据线D和扫描线S的交叉区域形成有子像素P，同一行的所有子像素P连接到同一扫描线S，同一列的所有子像素P连接同一数据线D，需要说明的是，图3中仅示例性示出了显示面板10的一部分数据线D和扫描线S以及子像素P。
在本实施例中，如图3所示，所述显示面板10中的每一像素单元10a对应 的三个子像素P呈垂直排列，每一像素单元10a对应的三个子像素P依次为红色子像素R、绿色子像素G和蓝色子像素B。
本实施例中，针对每一像素单元10a对应的三个子像素P呈垂直排列的方式，提供了一种新的源极驱动模块20。如图4所示，所述源极驱动模块20包括伽马电压发生单元21和数据驱动单元22，所述数据驱动单元22接收所述伽马电压发生单元21输出的伽马电压，并根据所述伽马电压产生相应的数据信号提供显示面板。其中，所述伽马电压发生单元21包括第一伽马电压发生器211和第二伽马电压发生器212，所述第一伽马电压发生器211发生并输出第一伽马电压，所述第二伽马电压发生器212发生并输出第二伽马电压。所述源极驱动模块20中还包括一电压选择单元23，所述电压选择单元23连接与所述伽马电压发生单元21和所述数据驱动单元22之间，用于在同一时刻内选择由所述第一伽马电压和第二伽马电压的其中之一输入至所述数据驱动单元22。由此，由所述数据驱动单元22提供数据信号的每一列子像素P，通过电压选择单元23的切换选择，数据驱动单元22可以根据两组伽马电压驱动同一列的子像素P，有效改善子像素P因充电不足引起的色偏问题，可以提高显示面板的显示品质。
进一步地，如图4所示，所述电压选择单元23包括第一开关231和第二开关232，所述第一伽马电压发生器211通过所述第一开关231连接至所述数据驱动单元22，所述第二伽马电压发生器212通过所述第二开关232连接至所述数据驱动单元22。在同一时刻内，所述第一开关231和第二开关232的其中之一被控制为开启，被开启的第一开关231或第二开关232所对应的第一伽马电压或第二伽马电压输入至所述数据驱动单元22。其中，所述第一开关231和第二开关232可以连接到同一控制信号，由同一控制信号控制第一开关231和第二开关232的开启和关闭。具体地，所述控制信号包括第一状态和第二状态，当所述控制信号处于第一状态时，所述第一开关231开启，所述第二开关232关闭；当所述控制信号处于第二状态时，所述第一开关231关闭，所述第二开关232开启。
更具体地，在本实施例中，如图5所示，所述第一开关231为N沟道MOS晶体管，N沟道MOS晶体管的栅极连接到控制信号A，源极连接到所述第一伽马电压发生器211，漏极连接到所述数据驱动单元22；所述第二开关232为P沟道MOS晶体管，P沟道MOS晶体管的栅极连接到控制信号A，源极连接到所述第二伽马电压发生器212，漏极连接到所述数据驱动单元22。所述控制信 号A为方波信号；当所述方波信号处于高电平状态时，所述第一开关231开启，所述第二开关232关闭，由所述第一伽马电压发生器211产生的第一伽马电压输入至所述数据驱动单元22；当所述方波信号处于低电平状态时，所述第一开关231关闭，所述第二开关232开启，此时，由所述第二伽马电压发生器212产生的第二伽马电压输入至所述数据驱动单元22。
在本实施例中，如图6所示，所述方波信号(控制信号A)的周期为T1，所述方波信号的占空比为1/2。所述方波信号的周期T1与显示面板的行同步信号(HSYNC)的周期T2的关系为：T1＝2×T2。在此，行同步信号(HSYNC)的周期T2的时间为每一行子像素的扫描时间，即充电时间。由此，结合图3-图6，以方波信号从高电平开始，栅极驱动模块30逐行扫描，源极驱动模块20对每一列子像素P的充电过程如下：
(1)、初始时，第一行的红色子像素R接通扫描信号，方波信号为高电平状态H，第一开关231开启，第二开关232关闭，数据驱动单元22接收第一伽马电压发生器211产生的第一伽马电压，产生相应的数据信号输入到第一行的红色子像素R进行充电；
(2)、当第二行的绿色子像素G接通扫描信号时，方波信号进入低电平状态L，第一开关231关闭，第二开关232开启，数据驱动单元22接收第二伽马电压发生器212产生的第二伽马电压，产生相应的数据信号输入到第二行的绿色子像素G进行充电；
(3)、当第三行的蓝色子像素B接通扫描信号时，方波信号转换为高电平状态H，第一开关231开启，第二开关232关闭，数据驱动单元22接收第一伽马电压发生器211产生的第一伽马电压，产生相应的数据信号输入到第三行的蓝色子像素B进行充电；
(4)、当第四行的红色子像素R接通扫描信号时，方波信号转换为低电平状态L，第一开关231关闭，第二开关232开启，数据驱动单元22接收第二伽马电压发生器212产生的第二伽马电压，产生相应的数据信号输入到第四行的红色子像素R进行充电。
以此类推，每一列的相邻行的不同颜色的子像素P，数据驱动单元22依次交替地根据第一伽马电压和第二伽马电压产生数据信号进行充电。对于每一像素单元10a对应的红色子像素R、绿色子像素G和蓝色子像素B，有一个或两 个子像素是根据第一伽马电压进行充电，并且，另外的两个或一个则是根据第二伽马电压进行充电。
在另外一个优选的实施例中，如图7所示，所述方波信号(控制信号A)的占空比为2/3。所述方波信号的周期T1与显示面板的行同步信号(HSYNC)的周期T2的关系为：T1＝3×T2。由此，结合图3-图6，以方波信号从高电平开始，栅极驱动模块30逐行扫描，源极驱动模块20对每一列子像素P的充电过程如下：
(1)、初始时，第一行的红色子像素R接通扫描信号，方波信号为高电平状态H，第一开关231开启，第二开关232关闭，数据驱动单元22接收第一伽马电压发生器211产生的第一伽马电压，产生相应的数据信号输入到第一行的红色子像素R进行充电；
(2)、当第二行的绿色子像素G接通扫描信号时，方波信号还是高电平状态H，第一开关231开启，第二开关232关闭，数据驱动单元22接收第一伽马电压发生器211产生的第一伽马电压，产生相应的数据信号输入到第二行的绿色子像素G进行充电；
(3)、当第三行的蓝色子像素B接通扫描信号时，方波信号转换为低电平状态L，第一开关231关闭，第二开关232开启，数据驱动单元22接收第二伽马电压发生器212产生的第二伽马电压，产生相应的数据信号输入到第三行的蓝色子像素B进行充电；
(4)、当第四行的红色子像素R接通扫描信号时，方波信号又转换为高电平状态H，第一开关231开启，第二开关232关闭，数据驱动单元22接收第一伽马电压发生器211产生的第一伽马电压，产生相应的数据信号输入到第四行的红色子像素R进行充电。
以此类推，对于每一像素单元10a对应的红色子像素R和绿色子像素G，数据驱动单元22根据第一伽马电压产生数据信号进行充电，而对于每一像素单元10a中的蓝色子像素B，数据驱动单元22则是根据第一伽马电压产生数据信号进行充电。当然，还可以调整方波信号中高电平的起始位置，设置为每一像素单元10a的绿色子像素G和蓝色子像素B根据第一伽马电压进行充电，而每一像素单元10a中的红色子像素R则根据第二伽马电压进行充电；或者是，设置为每一像素单元10a的蓝色子像素B和红色子像素R根据第一伽马电压进行 充电，而每一像素单元10a中的绿色子像素G则根据第二伽马电压进行充电。
进一步地，在本实施例中，所述数据驱动单元22包括以覆晶薄膜的架构连接到所述显示面板10的数据驱动芯片，即COF(Chip On Film)芯片。COF芯片可以为多个，每个COF芯片对应于不同区域的多列子像素，每个COF芯片分别通过所述电压选择单元23连接到所述第一伽马电压发生器211和所述第二伽马电压发生器212。
综上所述，本发明实施例提供的源极驱动模块以及液晶显示装置，源极驱动模块中设置有两个伽马电压发生器产生两组伽马电压，两组伽马电压由电压选择单元选择其中之一输入到数据驱动单元。通过电压选择单元的切换选择，可以根据两组伽马电压驱动显示面板中同一列的子像素，有效改善子像素因充电不足引起的色偏问题，特别是对于子像素垂直排列的显示面板，可以提高显示面板的显示品质。进一步地，两组伽马电压可以共用一个数据驱动单元中的数据驱动器，有效地节省成本。另外，所提供的源极驱动模块结构简单，易于实现，有利于大规模的产业化应用。
需要说明的是，在本文中，诸如第一和第二等之类的关系术语仅仅用来将一个实体或者操作与另一个实体或操作区分开来，而不一定要求或者暗示这些实体或操作之间存在任何这种实际的关系或者顺序。而且，术语“包括”、“包含”或者其任何其他变体意在涵盖非排他性的包含，从而使得包括一系列要素的过程、方法、物品或者设备不仅包括那些要素，而且还包括没有明确列出的其他要素，或者是还包括为这种过程、方法、物品或者设备所固有的要素。在没有更多限制的情况下，由语句“包括一个……”限定的要素，并不排除在包括所述要素的过程、方法、物品或者设备中还存在另外的相同要素。
以上所述仅是本申请的具体实施方式，应当指出，对于本技术领域的普通技术人员来说，在不脱离本申请原理的前提下，还可以做出若干改进和润饰，这些改进和润饰也应视为本申请的保护范围。

Claims (19)

  1. 一种源极驱动模块，用于向显示面板提供数据信号，所述源极驱动模块包括伽马电压发生单元和数据驱动单元，所述数据驱动单元接收所述伽马电压发生单元输出的伽马电压，并根据所述伽马电压产生相应的数据信号提供显示面板，其中，
    所述伽马电压发生单元包括第一伽马电压发生器和第二伽马电压发生器，所述第一伽马电压发生器发生并输出第一伽马电压，所述第二伽马电压发生器发生并输出第二伽马电压；
    所述源极驱动模块还包括一电压选择单元，用于在同一时刻内选择所述第一伽马电压和第二伽马电压的其中之一输入至所述数据驱动单元。
  2. 根据权利要求1所述的源极驱动模块，其中，所述电压选择单元包括第一开关和第二开关，所述第一伽马电压发生器通过所述第一开关连接至所述数据驱动单元，所述第二伽马电压发生器通过所述第二开关连接至所述数据驱动单元；在同一时刻内，所述第一开关和第二开关的其中之一被控制为开启，被开启的第一开关或第二开关所对应的第一伽马电压或第二伽马电压输入至所述数据驱动单元。
  3. 根据权利要求2所述的源极驱动模块，其中，所述第一开关和第二开关连接到同一控制信号，所述控制信号包括第一状态和第二状态；
    所述控制信号处于第一状态时，所述第一开关开启，所述第二开关关闭；
    所述控制信号处于第二状态时，所述第一开关关闭，所述第二开关开启。
  4. 根据权利要求2所述的源极驱动模块，其中，所述第一开关和第二开关连接到同一控制信号，所述控制信号为方波信号；
    所述方波信号处于高电平状态时，所述第一开关开启，所述第二开关关闭；
    所述方波信号处于低电平状态时，所述第一开关关闭，所述第二开关开启。
  5. 根据权利要求4所述的源极驱动模块，其中，所述方波信号的周期为T1，所述显示面板的行同步信号的周期为T2，T1＝3×T2；并且，所述方波信号的占空比为2/3。
  6. 根据权利要求5所述的源极驱动模块，其中，所述第一开关为N沟道MOS晶体管，N沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第一伽马电压发生器，漏极连接到所述数据驱动单元；所述第二开关为P沟道MOS晶体管，P沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第二伽马电压发生器，漏极连接到所述数据驱动单元。
  7. 根据权利要求4所述的源极驱动模块，其中，所述方波信号的周期为T1，所述显示面板的行同步信号的周期为T2，T1＝2×T2；所述方波信号的占空比为1/2。
  8. 根据权利要求7所述的源极驱动模块，其中，所述第一开关为N沟道MOS晶体管，N沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第一伽马电压发生器，漏极连接到所述数据驱动单元；所述第二开关为P沟道MOS晶体管，P沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第二伽马电压发生器，漏极连接到所述数据驱动单元。
  9. 根据权利要求1所述的源极驱动模块，其中，所述数据驱动单元包括以覆晶薄膜的架构连接到所述显示面板的数据驱动芯片。
  10. 一种液晶显示装置，其中，包括：
    显示面板，所述显示面板中设置有纵横交错的多条数据线和多条扫描线，数据线和扫描线的交叉区域形成有子像素，同一行的所有子像素连接到同一扫描线，同一列的所有子像素连接同一数据线；其中，每一像素单元对应的三个子像素呈垂直排列；
    源极驱动模块，用于通过所述数据线向所述显示面板中的子像素提供数据信号；
    栅极驱动模块，用于通过所述扫描线向所述显示面板中的子像素提供扫描信号；
    时序控制器，用于向所述源极驱动模块和所述栅极驱动模块提供时序控制信号，并且向所述源极驱动模块发送待显示的图像信号；
    其中，所述源极驱动模块包括伽马电压发生单元和数据驱动单元，所述数据驱动单元接收所述伽马电压发生单元输出的伽马电压，并根据所述伽马电压产生相应的数据信号提供显示面板，其中，
    所述伽马电压发生单元包括第一伽马电压发生器和第二伽马电压发生器，所述第一伽马电压发生器发生并输出第一伽马电压，所述第二伽马电压发生器发生并输出第二伽马电压；
    所述源极驱动模块还包括一电压选择单元，用于在同一时刻内选择所述第一伽马电压和第二伽马电压的其中之一输入至所述数据驱动单元。
  11. 根据权利要求10所述的液晶显示装置，其中，所述电压选择单元包括第一开关和第二开关，所述第一伽马电压发生器通过所述第一开关连接至所述数据驱动单元，所述第二伽马电压发生器通过所述第二开关连接至所述数据驱动单元；在同一时刻内，所述第一开关和第二开关的其中之一被控制为开启，被开启的第一开关或第二开关所对应的第一伽马电压或第二伽马电压输入至所述数据驱动单元。
  12. 根据权利要求11所述的液晶显示装置，其中，所述第一开关和第二开关连接到同一控制信号，所述控制信号包括第一状态和第二状态；
    所述控制信号处于第一状态时，所述第一开关开启，所述第二开关关闭；
    所述控制信号处于第二状态时，所述第一开关关闭，所述第二开关开启。
  13. 根据权利要求11所述的液晶显示装置，其中，所述第一开关和第二开关连接到同一控制信号，所述控制信号为方波信号；
    所述方波信号处于高电平状态时，所述第一开关开启，所述第二开关关闭；
    所述方波信号处于低电平状态时，所述第一开关关闭，所述第二开关开启。
  14. 根据权利要求13所述的液晶显示装置，其中，所述方波信号的周期为T1，所述显示面板的行同步信号的周期为T2，T1＝3×T2；并且，所述方波信号的占空比为2/3。
  15. 根据权利要求14所述的液晶显示装置，其中，所述第一开关为N沟道MOS晶体管，N沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第一伽马电压发生器，漏极连接到所述数据驱动单元；所述第二开关为P沟道MOS晶体管，P沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第二伽马电压发生器，漏极连接到所述数据驱动单元。
  16. 根据权利要求13所述的液晶显示装置，其中，所述方波信号的周期为 T1，所述显示面板的行同步信号的周期为T2，T1＝2×T2；所述方波信号的占空比为1/2。
  17. 根据权利要求16所述的液晶显示装置，其中，所述第一开关为N沟道MOS晶体管，N沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第一伽马电压发生器，漏极连接到所述数据驱动单元；所述第二开关为P沟道MOS晶体管，P沟道MOS晶体管的栅极连接所述控制信号，源极连接到所述第二伽马电压发生器，漏极连接到所述数据驱动单元。
  18. 根据权利要求10所述的液晶显示装置，其中，所述数据驱动单元包括以覆晶薄膜的架构连接到所述显示面板的数据驱动芯片。
  19. 根据权利要求10所述的液晶显示装置，其特征在于，每一像素单元对应的三个子像素依次为红色子像素、绿色子像素和蓝色子像素。
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