WO2018157419A1 - 驱动电路及液晶显示装置 - Google Patents

驱动电路及液晶显示装置 Download PDF

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Publication number
WO2018157419A1
WO2018157419A1 PCT/CN2017/077093 CN2017077093W WO2018157419A1 WO 2018157419 A1 WO2018157419 A1 WO 2018157419A1 CN 2017077093 W CN2017077093 W CN 2017077093W WO 2018157419 A1 WO2018157419 A1 WO 2018157419A1
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WO
WIPO (PCT)
Prior art keywords
voltage
timing control
relationship
chip
brightness
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Ceased
Application number
PCT/CN2017/077093
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English (en)
French (fr)
Inventor
陈宥烨
何振伟
吴宇
何涛
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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Application filed by Shenzhen China Star Optoelectronics Technology Co Ltd filed Critical Shenzhen China Star Optoelectronics Technology Co Ltd
Priority to US15/522,245 priority Critical patent/US20180293928A1/en
Publication of WO2018157419A1 publication Critical patent/WO2018157419A1/zh
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • 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
    • 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
    • G09G3/3611—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
    • 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
    • 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
    • G09G3/3674—Details of drivers for scan 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
    • 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
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery
    • 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
    • G09G2320/0666—Adjustment of display parameters for control of colour parameters, e.g. colour temperature
    • 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

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a driving circuit and a liquid crystal display device.
  • the driving circuit of the liquid crystal display panel includes: a programmable gamma correction buffer chip 11, a timing control chip 12, a power management chip 13, a source driving chip 14, and a gate driving chip 15; wherein, the programmable gamma correction buffer chip 11 is used for
  • the reference voltage is supplied to the source driving chip 14, generally 14 gray scale reference voltages are required between 0 and 14V, and the positive and negative polarities are half of each, generally gray scale Reference voltages of 0, 1, 31, 127, 223, 254, 255.
  • the gray scale and brightness of the panel must meet a certain relationship curve to achieve the best visual effect of the human eye, usually When the gamma value is 2.2, the visual effect is the best.
  • the source driver chip 14 has a built-in voltage module, which can divide 256 voltages from the initial voltage VAA provided by the power management chip 13, corresponding to 0 to 255 gray scales; when the source driver chip 14 is connected to the initial voltage VAA, but no reference is input.
  • a set of gray scale voltage values linearly proportional to the resistance value is obtained, and it is generally difficult to satisfy that each gray scale is in the gamma.
  • the reference voltage can be adjusted so that each gray scale and brightness satisfy gamma The relationship of 2.2, and the voltage of each gray point is then divided by the resistor to obtain the corresponding gray scale voltage, so that the full gray scale is basically near the curve of gamma 2.2.
  • An object of the present invention is to provide a driving circuit and a liquid crystal display device which can simplify the structure of the driving circuit and thereby reduce the production cost.
  • the present invention provides a driving circuit including:
  • a power management chip for generating a data control voltage and a scan control voltage
  • timing control chip configured to provide a first timing control signal, a video signal, and a second timing control signal; and provide a white balance adjustment table, and the data signal is debugged according to the white balance adjustment table to optimize the gamma curve;
  • a source driving chip configured to convert the video signal into a plurality of gray scale voltages; obtain, in advance, a relationship between brightness and gray scale of the display panel under the preset gamma curve and a relationship between brightness and voltage of the display panel, and according to the a relationship between brightness and gray scale and a relationship between the brightness and voltage to obtain a resistance string value, and generating the data signal according to the data control voltage, the first timing control signal, the video signal, and the resistor string value In order to make the display effect of the panel meet the preset conditions;
  • a gate driving chip configured to generate a scan signal according to the scan control voltage and the second timing control signal.
  • the source driving chip is specifically configured to obtain a relationship between the gray scale and the voltage after the voltage division according to the relationship between the brightness and the gray level and the relationship between the brightness and the voltage;
  • the relationship between the gray scale and the voltage after the pressure is obtained as a resistor string value.
  • the power management chip includes a first output end
  • the timing control chip includes a second output end
  • the gate driving chip includes a first input end and a second input end, the first The input end is coupled to the first output end, and the second input end is coupled to the second output end.
  • the power management chip includes a first output end, the timing control chip includes a second output end, and the source driving chip includes a third input end and a fourth input end; The input terminal is coupled to the first output terminal, and the fourth input terminal is coupled to the second output terminal.
  • the invention provides a driving circuit comprising:
  • a power management chip for generating a data control voltage
  • timing control chip for providing a first timing control signal and a video signal
  • a source driving chip configured to convert the video signal into a plurality of gray scale voltages; obtain, in advance, a relationship between brightness and gray scale of the display panel under the preset gamma curve and a relationship between brightness and voltage of the display panel, and according to the The relationship between the brightness and the gray level and the relationship between the brightness and the voltage obtain the relationship between the gray level and the voltage after the partial pressure; according to the relationship between the gray level and the voltage after the partial pressure, the resistance string value is obtained, and the voltage is controlled according to the data, The first timing control signal, the video signal, and the resistor string value generate a data signal to cause a display effect of the panel to meet a preset condition.
  • the timing control chip is further configured to provide a white balance adjustment table; and debug the data signal according to the white balance adjustment table to optimize the gamma curve.
  • the driving circuit further includes a gate driving chip
  • the power management chip is further configured to generate a scan control voltage
  • the timing control chip is further configured to provide a second timing control signal
  • the gate driving chip is configured to generate a scan signal according to the scan control voltage and the second timing control signal.
  • the power management chip includes a first output end
  • the timing control chip includes a second output end
  • the gate driving chip includes a first input end and a second input end, the first The input end is coupled to the first output end, and the second input end is coupled to the second output end.
  • the power management chip includes a first output end, the timing control chip includes a second output end, and the source driving chip includes a third input end and a fourth input end; The input terminal is coupled to the first output terminal, and the fourth input terminal is coupled to the second output terminal.
  • the present invention also provides a liquid crystal display device comprising: a liquid crystal display panel and a driving circuit, the driving circuit comprising:
  • a power management chip for generating a data control voltage
  • timing control chip for providing a first timing control signal and a video signal
  • a source driving chip configured to convert the video signal into a plurality of gray scale voltages; obtain, in advance, a relationship between brightness and gray scale of the display panel under the preset gamma curve and a relationship between brightness and voltage of the display panel, and according to the The relationship between the brightness and the gray level and the relationship between the brightness and the voltage obtain the relationship between the gray level and the voltage after the partial pressure; according to the relationship between the gray level and the voltage after the partial pressure, the resistance string value is obtained, and the voltage is controlled according to the data, The first timing control signal, the video signal, and the resistor string value generate a data signal to cause a display effect of the panel to meet a preset condition.
  • the timing control chip is further configured to provide a white balance adjustment table; and debug the data signal according to the white balance adjustment table to optimize a gamma curve.
  • the driving circuit further includes a gate driving chip
  • the power management chip is further configured to generate a scan control voltage
  • the timing control chip is further configured to provide a second timing control signal
  • the gate driving chip is configured to generate a scan signal according to the scan control voltage and the second timing control signal.
  • the power management chip includes a first output terminal
  • the timing control chip includes a second output terminal
  • the gate driving chip includes a first input end and a second input end, An input is coupled to the first output, and a second input is coupled to the second output.
  • the power management chip includes a first output end, the timing control chip includes a second output end, and the source drive chip includes a third input end and a fourth input end; A three input terminal is coupled to the first output terminal, and a fourth input terminal is coupled to the second output terminal.
  • the driving circuit and the liquid crystal display device of the present invention have a relationship between the brightness and the gray level and the brightness and voltage according to the preset gamma curve by the source driving chip because the programmable gamma correction buffer chip is not required to provide the reference voltage.
  • the relationship of the resistor string value can also make the brightness and gray scale relationship of the panel roughly satisfy the gamma The condition of 2.2, which simplifies the drive circuit, thus reduces production costs.
  • 1 is a schematic structural view of a conventional driving circuit
  • FIG. 2 is a schematic structural view of a driving circuit of the present invention
  • Figure 3 is a graph of brightness and gray scale
  • Figure 4 is a graph of brightness and voltage
  • Figure 5 is a graph of gray scale and voltage.
  • FIG. 2 is a schematic structural diagram of a driving circuit of the present invention.
  • the driving circuit of the present invention includes a power management chip 21, a timing control chip 22, and a source driving chip 23.
  • the power management chip 21 is used to generate a data control voltage; the data control voltage is, for example, VAA, HVAA.
  • the timing control chip 22 is configured to provide a first timing control signal and a video signal.
  • the source driving chip 23 is configured to convert the video signal into a plurality of gray scale voltages, and provide the panel signals to the panel according to a certain timing; and obtain the brightness and gray of the display panel under a preset gamma curve (for example, a curve when the gamma is equal to 2.2).
  • a preset gamma curve for example, a curve when the gamma is equal to 2.2.
  • the source driving chip 23 obtains the relationship between the gray scale and the voltage after the voltage division according to the relationship between the brightness and the gray scale and the relationship between the brightness and the voltage, wherein the gray scale and the voltage curve are as shown in FIG. 5 , and FIG. 5
  • the abscissa represents the voltage and the ordinate represents the gray scale.
  • the source driver chip 23 obtains a resistor string value according to the proportional relationship between the gray scale and the voltage after the voltage division; the resistor string value is used to correct the resistor string value built in the source driver chip 23.
  • generating a data signal according to the data control voltage, the first timing control signal, the video signal, and the resistor string value, so that the display effect of the panel meets a preset condition, such as achieving the best visual effect of the human eye. .
  • the timing control chip 22 is also used to provide a white balance adjustment table (WT). Table); and debugging the data signal according to the white balance adjustment table. For example, when the brightness of the panel process is offset, the WT table debugging can be performed to make the panel gamma curve meet the demand.
  • WT white balance adjustment table
  • the drive circuit of the present invention also includes a gate drive chip 24.
  • the power management chip 21 is further configured to generate a scan control voltage, such as VGH, VGL;
  • the timing control chip 22 is further configured to provide a second timing control signal;
  • the gate driving chip 24 is configured to control the voltage according to the scan.
  • the second timing control signal generates a scan signal.
  • the power management chip 21 includes a first output 211, and the timing control chip 22 includes a second output 221, the gate drive chip 23 includes a first input 232 and a second input 231, the first input The end 232 is connected to the first output end 211, and the second input end 231 is connected to the second output end 221.
  • the source driving chip 24 includes a third input end 242 and a fourth input end 241; the third input end 242 is connected to the first output end 211, and the fourth input end 241 and the second output end 221 connections.
  • the driving circuit of the present invention obtains a reference voltage by the programmable gamma correction buffer chip, and obtains the relationship between the brightness and the gray level and the relationship between the brightness and the voltage according to the preset gamma curve by the source driving chip 23.
  • the condition of 2.2 simplifies the structure of the drive circuit, thus reducing production costs.
  • the present invention also provides a liquid crystal display device including a liquid crystal display panel and a driving circuit.
  • the driving circuit of the present invention includes a power management chip 21, a timing control chip 22, and a source driving chip 23.
  • the power management chip 21 is used to generate a data control voltage; the data control voltage is, for example, VAA, HVAA.
  • the timing control chip 22 is configured to provide a first timing control signal and a video signal.
  • the source driving chip 23 is configured to convert the video signal into a plurality of gray scale voltages, and provide the panel signals to the panel according to a certain timing; and obtain the brightness and gray of the display panel under a preset gamma curve (for example, a curve when the gamma is equal to 2.2).
  • a preset gamma curve for example, a curve when the gamma is equal to 2.2.
  • the source driving chip 23 obtains the relationship between the gray scale and the voltage after the voltage division according to the relationship between the brightness and the gray level and the relationship between the brightness and the voltage, wherein the gray scale and the voltage curve are as shown in FIG. 5 .
  • the source driver chip 23 obtains a resistor string value according to the proportional relationship between the gray scale and the voltage after the voltage division; the resistor string value is used to correct the resistor string value built in the source driver chip 23.
  • the timing control chip 22 is also used to provide a white balance adjustment table (WT). Table); and debugging the data signal according to the white balance adjustment table. For example, when the brightness of the panel process is offset, the WT table debugging can be performed to make the panel gamma curve meet the demand.
  • WT white balance adjustment table
  • the drive circuit of the present invention also includes a gate drive chip 24.
  • the power management chip 21 is further configured to generate a scan control voltage, such as VGH, VGL;
  • the timing control chip 22 is further configured to provide a second timing control signal;
  • the gate driving chip 24 is configured to control the voltage according to the scan.
  • the second timing control signal generates a scan signal.
  • the power management chip 21 includes a first output 211, and the timing control chip 22 includes a second output 221, the gate drive chip 23 includes a first input 232 and a second input 231, the first input The end 232 is connected to the first output end 211, and the second input end 231 is connected to the second output end 221.
  • the source driving chip 24 includes a third input end 242 and a fourth input end 241; the third input end 242 is connected to the first output end 211, and the fourth input end 241 and the second output end 221 connections.
  • the programmable gamma correction buffer chip is not required to provide the reference voltage
  • the relationship between the brightness and the gray level and the brightness and voltage are determined by the source driving chip 23 according to the preset gamma curve. Obtain the relationship between the gray scale and the voltage after the partial pressure, and then obtain the resistance string value according to the relationship between the gray scale and the voltage after the partial pressure, and also make the relationship between the brightness and the gray scale of the panel substantially satisfy the gamma.
  • the condition of 2.2 simplifies the structure of the drive circuit, thus reducing production costs.

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

Abstract

一种驱动电路及液晶显示装置，该驱动电路包括：源驱动芯片（23），用于将视频信号转换成多个灰阶电压；获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系得到电阻串值；根据数据控制电压、第一时序控制信号、视频信号及电阻串值产生数据信号。

Description

驱动电路及液晶显示装置 技术领域
本发明涉及显示器技术领域，特别是涉及一种驱动电路及液晶显示装置。
 背景技术
目前液晶显示面板的驱动电路包括：可编程伽玛校正缓冲芯片11、时序控制芯片12、电源管理芯片13、源驱动芯片14以及栅驱动芯片15；其中，可编程伽玛校正缓冲芯片11用于向源驱动芯片14提供参考电压，一般0~14V之间需要14个灰阶参考电压，正负极性各一半，一般为灰阶 0、1、31、127、223、254、255的参考电压。
面板的灰阶和亮度需满足一定的关系曲线，以达到人眼最佳的视觉效果，通常 gamma值为2.2时，视觉效果最佳。
源驱动芯片14内置一组分压模块，可以从电源管理芯片13提供的初始电压VAA分出256个电压，对应0~255灰阶；当源驱动芯片14接入初始电压VAA，但未输入参考电压时，会得出一组与电阻值成线性比例的灰阶电压值，一般很难满足各灰阶都处于gamma 2.2的曲线上。当在输入参考电压时，可以通过调整参考电压值使得各灰阶与亮度满足gamma 2.2的关系，而各灰阶点的电压再由电阻分压得到相应的灰阶电压，这样可以使得全灰阶基本处于gamma 2.2的曲线附近。
由于现有的驱动电路需要设置可编程伽玛校正缓冲芯片11，因此增大了生产成本。
因此，有必要提供一种驱动电路及液晶显示装置，以解决现有技术所存在的问题。
 技术问题
本发明的目的在于提供一种驱动电路及液晶显示装置，能够简化驱动电路的结构，从而降低生产成本。
 技术解决方案
为解决上述技术问题，本发明提供一种驱动电路，其包括：
电源管理芯片，用于产生数据控制电压和扫描控制电压；
时序控制芯片，用于提供第一时序控制信号、视频信号以及第二时序控制信号；并提供白平衡调整表，根据所述白平衡调整表对数据信号进行调试，以优化伽玛曲线；
源驱动芯片，用于将所述视频信号转换成多个灰阶电压；预先获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系得到电阻串值，以及根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生所述数据信号，以使面板的显示效果满足预设条件；
栅驱动芯片，用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
在本发明的驱动电路中，所述源驱动芯片，具体用于根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系；并根据所述分压后灰阶与电压的关系得到电阻串值。
在本发明的驱动电路中，所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述栅驱动芯片包括第一输入端和第二输入端，所述第一输入端与所述第一输出端连接，所述第二输入端与所述第二输出端连接。
在本发明的驱动电路中，所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述源驱动芯片包括第三输入端和第四输入端；所述第三输入端与所述第一输出端连接，所述第四输入端与所述第二输出端连接。
本发明提供一种驱动电路，其包括：
电源管理芯片，用于产生数据控制电压；
时序控制芯片，用于提供第一时序控制信号及视频信号；
源驱动芯片，用于将所述视频信号转换成多个灰阶电压；预先获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系；根据所述分压后灰阶与电压的关系得到电阻串值，以及根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生数据信号，以使面板的显示效果满足预设条件。
在本发明的驱动电路中，所述时序控制芯片，还用于提供白平衡调整表；并根据所述白平衡调整表对所述数据信号进行调试，以优化伽玛曲线。
在本发明的驱动电路中，所述驱动电路还包括栅驱动芯片；
所述电源管理芯片，还用于产生扫描控制电压；
所述时序控制芯片，还用于提供第二时序控制信号；
所述栅驱动芯片，用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
在本发明的驱动电路中，所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述栅驱动芯片包括第一输入端和第二输入端，所述第一输入端与所述第一输出端连接，所述第二输入端与所述第二输出端连接。
在本发明的驱动电路中，所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述源驱动芯片包括第三输入端和第四输入端；所述第三输入端与所述第一输出端连接，所述第四输入端与所述第二输出端连接。
本发明还提供一种液晶显示装置，其包括：液晶显示面板和驱动电路，所述驱动电路包括：
电源管理芯片，用于产生数据控制电压；
时序控制芯片，用于提供第一时序控制信号及视频信号；
源驱动芯片，用于将所述视频信号转换成多个灰阶电压；预先获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系；根据所述分压后灰阶与电压的关系得到电阻串值，以及根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生数据信号，以使面板的显示效果满足预设条件。
在本发明的液晶显示装置中，所述时序控制芯片，还用于提供白平衡调整表；并根据所述白平衡调整表对所述数据信号进行调试，以优化伽玛曲线。
在本发明的液晶显示装置中，所述驱动电路还包括栅驱动芯片；
所述电源管理芯片，还用于产生扫描控制电压；
所述时序控制芯片，还用于提供第二时序控制信号；
所述栅驱动芯片，用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
在本发明的液晶显示装置中，所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述栅驱动芯片包括第一输入端和第二输入端，所述第一输入端与所述第一输出端连接，所述第二输入端与所述第二输出端连接。
在本发明的液晶显示装置中，所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述源驱动芯片包括第三输入端和第四输入端；所述第三输入端与所述第一输出端连接，所述第四输入端与所述第二输出端连接。
 有益效果
本发明的驱动电路及液晶显示装置，由于不需要可编程伽玛校正缓冲芯片提供参考电压，而通过源驱动芯片根据预设伽玛曲线下所述亮度与灰阶的关系和所述亮度与电压的关系获取电阻串值，也能够使得面板的亮度与灰阶关系大致满足gamma 2.2的条件，也即简化了驱动电路，因此降低了生产成本。
 附图说明
图1为现有驱动电路的结构示意图；
图2为本发明的驱动电路的结构示意图；
图3为亮度与灰阶曲线图；
图4为亮度与电压曲线图；
图5为灰阶与电压曲线图。
 本发明的最佳实施方式
以下各实施例的说明是参考附加的图式，用以例示本发明可用以实施的特定实施例。本发明所提到的方向用语，例如「上」、「下」、「前」、「后」、「左」、「右」、「内」、「外」、「侧面」等，仅是参考附加图式的方向。因此，使用的方向用语是用以说明及理解本发明，而非用以限制本发明。在图中，结构相似的单元是以相同标号表示。
请参照图2，图2为本发明的驱动电路的结构示意图。
如图2所示，本发明的驱动电路包括：电源管理芯片21、时序控制芯片22以及源驱动芯片23。电源管理芯片21用于产生数据控制电压；该数据控制电压比如为VAA、HVAA。
时序控制芯片22用于提供第一时序控制信号及视频信号。源驱动芯片23用于将所述视频信号转换成多个灰阶电压，并按一定时序提供给面板；预先获取预设伽玛曲线下（比如gamma等于2.2时的曲线）显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，其中亮度与灰阶的曲线如图3所示，图3中横坐标表示灰阶，纵坐标表示亮度。亮度与电压的曲线如图4所示，图4中横坐标表示电压，纵坐标表示亮度。
之后，源驱动芯片23根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系，其中灰阶与电压的曲线如图5所示，图5中横坐标表示电压，纵坐标表示灰阶。最后，源驱动芯片23根据所述分压后灰阶与电压的比例关系得到电阻串值；该电阻串值用以修正源驱动芯片23内置的电阻串值。之后根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生数据信号，以使面板的显示效果满足预设条件，比如达到人眼最佳的视觉效果。
为了进一步提高人眼的视觉效果，所述时序控制芯片22还用于提供白平衡调整表（WT table）；并根据白平衡调整表对所述数据信号进行调试。比如当面板制程过程中的亮度出现偏移，可以通过WT的table调试，使面板gamma曲线满足需求。
本发明的驱动电路还包括栅驱动芯片24。所述电源管理芯片21还用于产生扫描控制电压，比如为VGH、VGL；所述时序控制芯片22还用于提供第二时序控制信号；所述栅驱动芯片24用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
所述电源管理芯片21包括第一输出端211，所述时序控制芯片22包括第二输出端221，所述栅驱动芯片23包括第一输入端232和第二输入端231，所述第一输入端232与所述第一输出端211连接，所述第二输入端231与所述第二输出端221连接。
所述源驱动芯片24包括第三输入端242和第四输入端241；所述第三输入端242与所述第一输出端211连接，所述第四输入端241与所述第二输出端221连接。
本发明的驱动电路，由于不需要可编程伽玛校正缓冲芯片提供参考电压，而通过源驱动芯片23根据预设伽玛曲线下所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系，之后根据分压后灰阶与电压的关系获取电阻串值，也能够使得面板的亮度与灰阶关系大致满足gamma 2.2的条件，简化了驱动电路的结构，因此降低了生产成本。
本发明还提供一种液晶显示装置，其包括液晶显示面板和驱动电路，如图2所示，本发明的驱动电路包括：电源管理芯片21、时序控制芯片22以及源驱动芯片23。电源管理芯片21用于产生数据控制电压；该数据控制电压比如为VAA、HVAA。
时序控制芯片22用于提供第一时序控制信号及视频信号。源驱动芯片23用于将所述视频信号转换成多个灰阶电压，并按一定时序提供给面板；预先获取预设伽玛曲线下（比如gamma等于2.2时的曲线）显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，其中亮度与灰阶的曲线如图3所示，亮度与电压的曲线如图4所示。
之后，源驱动芯片23根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系，其中灰阶与电压的曲线如图5所示。最后，源驱动芯片23根据所述分压后灰阶与电压的比例关系得到电阻串值；该电阻串值用以修正源驱动芯片23内置的电阻串值。之后根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生数据信号，以使面板的显示效果满足预设条件，比如达到人眼最佳的视觉效果。
为了进一步提高人眼的视觉效果，所述时序控制芯片22还用于提供白平衡调整表（WT table）；并根据白平衡调整表对所述数据信号进行调试。比如当面板制程过程中的亮度出现偏移，可以通过WT的table调试，使面板gamma曲线满足需求。
本发明的驱动电路还包括栅驱动芯片24。所述电源管理芯片21还用于产生扫描控制电压，比如为VGH、VGL；所述时序控制芯片22还用于提供第二时序控制信号；所述栅驱动芯片24用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
所述电源管理芯片21包括第一输出端211，所述时序控制芯片22包括第二输出端221，所述栅驱动芯片23包括第一输入端232和第二输入端231，所述第一输入端232与所述第一输出端211连接，所述第二输入端231与所述第二输出端221连接。
所述源驱动芯片24包括第三输入端242和第四输入端241；所述第三输入端242与所述第一输出端211连接，所述第四输入端241与所述第二输出端221连接。
本发明的液晶显示装置，由于不需要可编程伽玛校正缓冲芯片提供参考电压，而通过源驱动芯片23根据预设伽玛曲线下所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系，之后根据分压后灰阶与电压的关系获取电阻串值，也能够使得面板的亮度与灰阶关系大致满足gamma 2.2的条件，简化了驱动电路的结构，因此降低了生产成本。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (14)

  1. 一种驱动电路，其包括：
    电源管理芯片，用于产生数据控制电压和扫描控制电压；
    时序控制芯片，用于提供第一时序控制信号、视频信号以及第二时序控制信号；并提供白平衡调整表，根据所述白平衡调整表对数据信号进行调试，以优化伽玛曲线；
    源驱动芯片，用于将所述视频信号转换成多个灰阶电压；预先获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系得到电阻串值，以及根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生所述数据信号，以使面板的显示效果满足预设条件；
    栅驱动芯片，用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
  2. 根据权利要求1所述的驱动电路，其中
    所述源驱动芯片，具体用于根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系；并根据所述分压后灰阶与电压的关系得到电阻串值。
  3. 根据权利要求1所述的驱动电路，其中
    所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述栅驱动芯片包括第一输入端和第二输入端，所述第一输入端与所述第一输出端连接，所述第二输入端与所述第二输出端连接。
  4. 根据权利要求1所述的驱动电路，其中
    所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述源驱动芯片包括第三输入端和第四输入端；所述第三输入端与所述第一输出端连接，所述第四输入端与所述第二输出端连接。
  5. 一种驱动电路，其包括：
    电源管理芯片，用于产生数据控制电压；
    时序控制芯片，用于提供第一时序控制信号及视频信号；
    源驱动芯片，用于将所述视频信号转换成多个灰阶电压；预先获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系；根据所述分压后灰阶与电压的关系得到电阻串值，以及根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生数据信号，以使面板的显示效果满足预设条件。
  6. 根据权利要求5所述的驱动电路，其中
    所述时序控制芯片，还用于提供白平衡调整表；并根据所述白平衡调整表对所述数据信号进行调试，以优化伽玛曲线。
  7. 根据权利要求5所述的驱动电路，其中所述驱动电路还包括栅驱动芯片；
    所述电源管理芯片，还用于产生扫描控制电压；
    所述时序控制芯片，还用于提供第二时序控制信号；
    所述栅驱动芯片，用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
  8. 根据权利要求7所述的驱动电路，其中
    所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述栅驱动芯片包括第一输入端和第二输入端，所述第一输入端与所述第一输出端连接，所述第二输入端与所述第二输出端连接。
  9. 根据权利要求5所述的驱动电路，其中
    所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述源驱动芯片包括第三输入端和第四输入端；所述第三输入端与所述第一输出端连接，所述第四输入端与所述第二输出端连接。
  10. 一种液晶显示装置，其包括：液晶显示面板和驱动电路，所述驱动电路包括：
    电源管理芯片，用于产生数据控制电压；
    时序控制芯片，用于提供第一时序控制信号及视频信号；
    源驱动芯片，用于将所述视频信号转换成多个灰阶电压；预先获取预设伽玛曲线下显示面板的亮度与灰阶的关系以及显示面板的亮度与电压的关系，并根据所述亮度与灰阶的关系和所述亮度与电压的关系获取分压后灰阶与电压的关系；根据所述分压后灰阶与电压的关系得到电阻串值，以及根据所述数据控制电压、所述第一时序控制信号、所述视频信号及所述电阻串值产生数据信号，以使面板的显示效果满足预设条件。
  11. 根据权利要求10所述的液晶显示装置，其中
    所述时序控制芯片，还用于提供白平衡调整表；并根据所述白平衡调整表对所述数据信号进行调试，以优化伽玛曲线。
  12. 根据权利要求10所述的液晶显示装置，其中所述驱动电路还包括栅驱动芯片；
    所述电源管理芯片，还用于产生扫描控制电压；
    所述时序控制芯片，还用于提供第二时序控制信号；
    所述栅驱动芯片，用于根据所述扫描控制电压和所述第二时序控制信号产生扫描信号。
  13. 根据权利要求12所述的液晶显示装置，其中
    所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述栅驱动芯片包括第一输入端和第二输入端，所述第一输入端与所述第一输出端连接，所述第二输入端与所述第二输出端连接。
  14. 根据权利要求12所述的液晶显示装置，其中
    所述电源管理芯片包括第一输出端，所述时序控制芯片包括第二输出端，所述源驱动芯片包括第三输入端和第四输入端；所述第三输入端与所述第一输出端连接，所述第四输入端与所述第二输出端连接。
PCT/CN2017/077093 2017-02-28 2017-03-17 驱动电路及液晶显示装置 Ceased WO2018157419A1 (zh)

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