WO2018018730A1 - 显示面板及其驱动系统 - Google Patents

显示面板及其驱动系统 Download PDF

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WO2018018730A1
WO2018018730A1 PCT/CN2016/099547 CN2016099547W WO2018018730A1 WO 2018018730 A1 WO2018018730 A1 WO 2018018730A1 CN 2016099547 W CN2016099547 W CN 2016099547W WO 2018018730 A1 WO2018018730 A1 WO 2018018730A1
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Prior art keywords
display panel
circuit
square wave
wave signal
operational amplifier
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English (en)
French (fr)
Inventor
曾德康
徐枫程
郭东胜
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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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Priority to US15/310,726 priority Critical patent/US20180226011A1/en
Publication of WO2018018730A1 publication Critical patent/WO2018018730A1/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
    • G09G3/2007—Display of intermediate tones
    • G09G3/2077—Display of intermediate tones by a combination of two or more gradation control methods
    • G09G3/2081—Display of intermediate tones by a combination of two or more gradation control methods with combination of amplitude modulation and time modulation
    • 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
    • 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
    • G09G3/2092—Details of a display terminals using a flat panel, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • 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
    • G09G5/00—Control arrangements or circuits for visual indicators common to cathode-ray tube indicators and other visual indicators
    • G09G5/003—Details of a display terminal, the details relating to the control arrangement of the display terminal and to the interfaces thereto
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0291—Details of output amplifiers or buffers arranged for use in a driving circuit
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00—Command of the display device
    • G09G2310/08—Details of timing specific for flat panels, other than clock recovery

Definitions

  • the present invention relates to the field of display, and in particular to a display panel and a drive system therefor.
  • a conventional display panel driving system 100 includes a DC/DC converter 101, a gamma correction circuit 102, a timing controller (TCON) 103, a source driving circuit 104, and a display panel 105.
  • the source driving circuit 104 mainly includes a resistor string (R-string) 106, a digital-to-analog converter (DAC) 107, and the like.
  • R-string resistor string
  • DAC digital-to-analog converter
  • FIG. 2 the circuit structure of the resistor string 106 and the DAC 107 module is complicated and occupies a large area, so the structure of the conventional display panel drive system is complicated and costly.
  • an exemplary embodiment of the inventive concept provides a driving system for a display panel.
  • the driving system of the display panel comprises: a driving system of a display panel, comprising: a DC-DC conversion circuit, a timing control circuit and a source driving circuit, wherein the source driving circuit comprises an active integrating circuit, and the timing control circuit controls
  • the DC-DC conversion circuit outputs a square wave signal, and extracts pixel grayscale value data from the received image signal; the active integration circuit outputs a grayscale voltage based on the pixel grayscale value data and the square wave signal.
  • the active integration circuit of the drive system of the display panel comprises a programmable resistor and an operational amplifier.
  • the negative input of the operational amplifier is connected to a programmable resistor, and the positive input of the operational amplifier is connected to the square wave signal.
  • the active integration circuit further includes a capacitor disposed between the negative input and the positive input of the operational amplifier.
  • the programmable resistors have different resistance values depending on different pixel gray scale value data.
  • the operational amplifier outputs a gray scale voltage based on the pixel gray scale value data and the square wave signal.
  • the output of the operational amplifier outputs a gray scale voltage
  • V ref represents the reference voltage value corresponding to the high level of the square wave signal
  • R represents the resistance value of the programmable resistor
  • C represents the capacitance value of the capacitor
  • V REF represents a square wave signal
  • t represents a time integral variable
  • an active integration circuit is employed in a source driving circuit, and a driving system of a display panel can be simplified, and a Gamma correction module, a resistor string, and a DAC module can be omitted, and the area of the printed circuit board can be reduced. , thereby effectively reducing production costs.
  • Figure 1 shows a drive system of a conventional display panel
  • FIG. 2 shows a resistor string and a DAC circuit included in a driving system of a conventional display panel
  • FIG. 3 illustrates a driving system of a display panel according to example embodiments
  • FIG. 4 illustrates an active integration circuit in accordance with example embodiments
  • FIG. 5A illustrates a waveform diagram of a square wave signal V REF according to an example embodiment
  • FIG. 5B illustrates a waveform diagram of an output gray scale voltage, according to an example embodiment.
  • FIG. 3 illustrates a driving system 300 of a display panel according to an exemplary embodiment of the inventive concept.
  • the driving system 300 of the display panel of the present invention includes: a direct current-direct current (DC/DC) conversion circuit 301.
  • TCON timing control circuit
  • the DC/DC conversion circuit 301 can provide power to each module in the drive system of the display panel.
  • the TCON 303 outputs a square wave of a desired duty ratio, which can be converted into a square wave signal V REF (for example, as shown in FIG. 5A) by the DC/DC conversion circuit 301, wherein the square wave signal V REF is at a high level.
  • the partially corresponding voltage value is V ref ; furthermore, the TCON 303 receives the image signal Sig and extracts pixel gray scale value data GLD associated with each color channel from the image signal Sig.
  • the active integration circuit 306 in the source drive circuit 304 receives the square wave signal V REF and the pixel gray scale value data GLD to output a gray scale voltage, and the display panel 305 displays the corresponding gray scale luminance according to the output gray scale voltage.
  • the active integration circuit 306 will be described in detail below with reference to FIG.
  • active integration circuit 306 is implemented by operational amplifier 306-3.
  • the negative input terminal of the operational amplifier 306-3 of the active integration circuit 306 is connected to the ground through a programmable resistor 306-1, and the positive input terminal of the operational amplifier 306-3 is connected to the square wave signal V REF at the operational amplifier 306-
  • a capacitor 306-2 having a constant capacitance value is connected between the output terminal of the 3 and the negative input terminal.
  • the corresponding gray scale voltage is output from the output terminal of the operational amplifier 306-3.
  • the gray scale voltage V o can be obtained according to the following Equation 1:
  • Equation 1 V ref represents a reference voltage value corresponding to a high level of the square wave signal, R represents a resistance value of the programmable resistor 306-1, C represents a capacitance value of the capacitor 306-2, and V REF represents a square.
  • Wave signal, t represents a time integral variable.
  • the capacitance value C is predetermined, and the resistance value R of the programmable resistor 306-1 varies according to the change of the pixel gray scale value data GLD of the image, and the gray scale voltage is output in the form of a triangular wave according to Equation 1. .
  • the slope of the triangular wave is adjusted by adjusting the resistance value R of the programmable resistor 306-1, so that different gray scale voltages can be obtained.
  • the display panel 305 to display the corresponding gray level in accordance with the gray scale voltage output V o.
  • an active integration circuit is employed in a source driving circuit, which can simplify a driving system of a display panel, save a Gamma correction module, and a resistor string and a DAC module, thereby reducing the area of the printed circuit board, thereby effectively Reduce 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)
  • Control Of El Displays (AREA)

Abstract

一种显示面板的驱动系统，该显示面板的驱动系统（300）包括：直流-直流变换电路（301）、时序控制电路（303）和源驱动电路（304），其中，源驱动电路（304）包括有源积分电路（306）；时序控制电路（303）控制直流-直流变换电路（301）输出方波信号，并且将接收的图像信号转换为像素灰阶值数据；有源积分电路（306）基于灰阶值数据和方波信号输出灰阶电压。该系统通过在源驱动电路（304）中采用有源积分电路（306），可以精简显示面板（305）的驱动系统，有效地降低生产成本。

Description

显示面板及其驱动系统 技术领域
本发明涉及显示领域，具体地说，涉及一种显示面板及其驱动系统。
背景技术
如图1所示，传统的显示面板的驱动系统100包括DC/DC变换器101、伽马校正(Gamma correction)电路102、时序控制器(TCON)103、源驱动电路104和显示面板105。源驱动电路104中主要包括有电阻串(R-string)106、数模转换器(DAC)107等模块。然而，如图2所示，电阻串106和DAC 107模块的电路结构复杂，占用较大的面积，因此传统的显示面板的驱动系统的结构复杂、成本较高。
发明内容
为克服现有技术的不足，根据本发明构思的示例实施例提供一种显示面板的驱动系统。所述显示面板的驱动系统包括：一种显示面板的驱动系统，其中，包括：直流-直流变换电路、时序控制电路和源驱动电路，其中，源驱动电路包括有源积分电路，时序控制电路控制直流-直流变换电路输出方波信号，并且从接收的图像信号提取像素灰阶值数据；有源积分电路基于像素灰阶值数据和方波信号输出灰阶电压。
优选地，所述显示面板的驱动系统的有源积分电路包括可编程电阻器和运算放大器。
优选地，所述运算放大器的负输入端与可编程电阻器相连，运算放大器的正输入端与方波信号连接。
优选地，有源积分电路还包括布置在运算放大器的负输入端与正输入端之间的电容器。
优选地，可编程电阻器根据不同的像素灰阶值数据而具有不同的电阻值。
优选地，运算放大器基于像素灰阶值数据和方波信号输出灰阶电压。
优选地，运算放大器的输出端输出灰阶电压
Figure PCTCN2016099547-appb-000001
其中，Vref表示方波信号的高电平所对应的参考电压值，R表示可编程电阻器的电阻值，C表示电容器的电容值，VREF表示方波信号，t表示时间积分变量。
有益效果：根据本发明构思的示例实施例，在源驱动电路中采用有源积分电路，可以精简显示面板的驱动系统，省去Gamma校正模块以及电阻串和DAC模块，可以缩小印刷电路板的面积，从而有效地降低生产成本。
附图说明
通过下面结合附图对示例实施例进行的详细描述，本发明构思的以上和其他方面、特征和优点将更加清楚，其中：
图1示出传统的显示面板的驱动系统；
图2示出包括在传统的显示面板的驱动系统中的电阻串和DAC电路；
图3示出根据示例实施例的显示面板的驱动系统；
图4示出根据示例实施例的有源积分电路；
图5A示出根据示例实施例的方波信号VREF的波形图；
图5B示出根据示例实施例的输出的灰阶电压的波形图。
具体实施方式
参照附图提供以下的描述以帮助全面理解由权利要求及其等同物限定的本发明构思的各种实施例。以下描述包括用于帮助理解的各种具体细节，但是这些细节应被仅视为示例性的。因此，本领域的普通技术人员将认识到，在不脱离本发明构思的范围和精神的情况下，可对这里描述的实施例进行各种改变和修改。另外，为了清楚和简明，可省略对公知功能和构造的描述。
图3示出根据本发明构思的示例实施例的显示面板的驱动系统300。参照图3，本发明的显示面板的驱动系统300包括：直流-直流(DC/DC)变换电路 301、时序控制电路(TCON)303、包括有源积分电路306的源驱动电路304以及显示面板305。
DC/DC变换电路301可以为显示面板的驱动系统中的各个模块提供电力。TCON 303输出所需占空比的方波，该方波可经过DC/DC变换电路301转变为方波信号VREF(例如，图5A所示)，其中，方波信号VREF的高电平部分对应的电压值为Vref；此外TCON 303接收图像信号Sig，并且从图像信号Sig中提取与各个颜色通道相关的像素灰阶值数据GLD。源驱动电路304中的有源积分电路306接收方波信号VREF和像素灰阶值数据GLD来输出灰阶电压，显示面板305根据输出的灰阶电压显示相应的灰阶亮度。下面将参照图4来详细地描述有源积分电路306。
如图4所示，有源积分电路306通过运算放大器306-3来实现。有源积分电路306的运算放大器306-3的负输入端通过可编程电阻器306-1连接到地端，运算放大器306-3的正输入端与方波信号VREF连接，在运算放大器306-3的输出端与负输入端之间连接有具有恒定电容值的电容器306-2。从运算放大器306-3的输出端输出相应的灰阶电压，例如，可根据以下的等式1得到灰阶电压Vo：
Figure PCTCN2016099547-appb-000002
在等式1中，Vref表示方波信号的高电平所对应的参考电压值，R表示可编程电阻器306-1的电阻值，C表示电容器306-2的电容值，VREF表示方波信号，t表示时间积分变量。其中，电容值C是预先确定的，而可编程电阻器306-1的电阻值R会根据图像的像素灰阶值数据GLD的变化而变化，根据等式1，以三角波的形式输出灰阶电压。参照等式1以及图5A和图5B，在充电时间t1内，当R值变化时，三角波的斜率(图5B中的K1～K3)随其变化，从而输出不同大小的灰阶电压Vo，例如，图5B中示出的V1～V3。因而，根据本发明构思的实施例，通过调整可编程电阻器306-1的电阻值R，来调整三角波的斜率，从而可获得不同的灰阶电压。显示面板305根据输出的灰阶电压Vo来显示相应的灰阶亮度。
根据本发明构思的示例实施例，在源驱动电路中采用有源积分电路，可以精简显示面板的驱动系统，省去Gamma校正模块以及电阻串和DAC模块，可以缩小印刷电路板的面积，从而有效地降低成本。
根据本发明构思的示例实施例不受限于如以上所描述的实施例，并且可在本发明构思的技术方案允许的范围内，在形式和细节上进行各种改变。
尽管已经参照本发明构思的实施例示出和描述了本发明，但是本领域的技术人员将理解，在不脱离由权利要求及其等同物限定的本公开的精神和范围的情况下，可在此进行形式和细节上的各种改变。

Claims (10)

  1. 一种显示面板的驱动系统，其中，包括：直流-直流变换电路、时序控制电路和源驱动电路，
    其中，源驱动电路包括有源积分电路，
    时序控制电路控制直流-直流变换电路输出方波信号，并且从接收的图像信号提取像素灰阶值数据；
    有源积分电路基于像素灰阶值数据和方波信号输出灰阶电压。
  2. 如权利要求1所述的显示面板的驱动系统，其中，有源积分电路包括可编程电阻器和运算放大器。
  3. 如权利要求2所述的显示面板的驱动系统，其中，运算放大器的负输入端与可编程电阻器相连，运算放大器的正输入端与方波信号连接。
  4. 如权利要求3所述的显示面板的驱动系统，其中，有源积分电路还包括布置在运算放大器的负输入端与正输入端之间的电容器。
  5. 如权利要求4所述的显示面板的驱动系统，其中，可编程电阻器根据不同的像素灰阶值数据而具有不同的电阻值。
  6. 如权利要求5所述的显示面板的驱动系统，其中，运算放大器基于像素灰阶值数据和方波信号输出灰阶电压。
  7. 如权利要求6所述的显示面板的驱动系统，其中，运算放大器的输出端输出灰阶电压
    Figure PCTCN2016099547-appb-100001
    其中，Vref表示方波信号的高电平所对应的参考电压值，R表示可编程电阻器的电阻值，C表示电容器的电容值，VREF表示方波信号，t表示时间积分变量。
  8. 一种显示面板，包括驱动系统，其中，所述驱动系统包括：直流-直流变换电路、时序控制电路和源驱动电路，
    其中，源驱动电路包括有源积分电路，
    时序控制电路控制直流-直流变换电路输出方波信号，并且从接收的图像信号提取像素灰阶值数据；
    有源积分电路基于像素灰阶值数据和方波信号输出灰阶电压。
  9. 如权利要求8所述的显示面板，其中，有源积分电路包括可编程电阻器和运算放大器，运算放大器的负输入端与可编程电阻器相连，运算放大器的正输入端与方波信号连接，有源积分电路还包括布置在运算放大器的负输入端与正输入端之间的电容器，可编程电阻器根据不同的像素灰阶值数据而具有不同的电阻值，运算放大器基于像素灰阶值数据和方波信号输出灰阶电压。
  10. 如权利要求9所述的显示面板，其中，运算放大器的输出端输出灰阶电压
    Figure PCTCN2016099547-appb-100002
    其中，Vref表示方波信号的高电平所对应的参考电压值，R表示可编程电阻器的电阻值，C表示电容器的电容值，VREF表示方波信号，t表示时间积分变量。
PCT/CN2016/099547 2016-07-28 2016-09-21 显示面板及其驱动系统 Ceased WO2018018730A1 (zh)

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