WO2016041241A1 - 一种源极驱动电路及显示装置 - Google Patents

一种源极驱动电路及显示装置 Download PDF

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Publication number
WO2016041241A1
WO2016041241A1 PCT/CN2014/090277 CN2014090277W WO2016041241A1 WO 2016041241 A1 WO2016041241 A1 WO 2016041241A1 CN 2014090277 W CN2014090277 W CN 2014090277W WO 2016041241 A1 WO2016041241 A1 WO 2016041241A1
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WIPO (PCT)
Prior art keywords
source driving
driving circuit
source
operational amplifiers
modules
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PCT/CN2014/090277
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English (en)
French (fr)
Inventor
朱江
陈宥烨
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 US14/417,160 priority Critical patent/US9940882B2/en
Publication of WO2016041241A1 publication Critical patent/WO2016041241A1/zh
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3611—Control of matrices with row and column drivers
    • G09G3/3696—Generation of voltages supplied to electrode drivers
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0404—Matrix technologies
    • G09G2300/0408—Integration of the drivers onto the display substrate
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2300/00—Aspects of the constitution of display devices
    • G09G2300/04—Structural and physical details of display devices
    • G09G2300/0421—Structural details of the set of electrodes
    • G09G2300/0426—Layout of electrodes and connections
    • 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
    • G09G2310/02—Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264—Details of driving circuits
    • G09G2310/0297—Special arrangements with multiplexing or demultiplexing of display data in the drivers for data electrodes, in a pre-processing circuitry delivering display data to said drivers or in the matrix panel, e.g. multiplexing plural data signals to one D/A converter or demultiplexing the D/A converter output to multiple columns
    • 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 circuit and a display device.
  • a thin film transistor liquid crystal display has a plurality of pixel units on a display panel, and each pixel unit has at least three sub-pixels of red, green, and blue. The brightness exhibited by each sub-pixel is determined by the gamma voltage.
  • the function of the gamma voltage driving circuit is to set the gamma voltage according to the gamma curve required by the liquid crystal display, and as a reference voltage for the gray scale display of the thin film transistor liquid crystal display.
  • Each gamma voltage is input to a source driver of a thin film transistor liquid crystal display, and a digital-to-analog converter in the source driving circuit generates all gray voltages.
  • the existing gamma voltage driving circuit includes a plurality of digital to analog converters (DACs) and a plurality of operational amplifiers (Operational Amplifiers, OP for short), each of which is connected to a corresponding one of the OPs. .
  • the DAC converts the received digital signal for generating the pixel gray scale reference voltage into an analog signal
  • the OP amplifies and converts the DAC processed analog signal into a source driving circuit as a pixel gray scale reference voltage. Due to the large cross-voltage of the OP, the power consumption of the OP is relatively large, and the heating efficiency is high, which causes the temperature of the gamma voltage driving circuit to rise, which is not conducive to integration with other driving circuits.
  • An object of the present invention is to provide a source driving circuit and a display device, which can effectively reduce the heat generation efficiency of the gamma voltage driving circuit that matches the source driving circuit, and reduce the temperature of the gamma voltage driving circuit, which is beneficial to the gamma circuit.
  • a first aspect of the present invention provides a source driving circuit, the source driving circuit being connected to a gamma driving circuit Several pixel grayscale reference voltages, including:
  • a plurality of operational amplifiers the number of operational amplifiers being equal to the number of grayscale reference voltages of the pixels output by the gamma driving circuit, and each operational amplifier is connected to a corresponding pixel grayscale reference voltage.
  • the source driving circuit further includes a plurality of first source driving modules, and the plurality of operational amplifiers are included in the plurality of first source driving modules.
  • the source driving circuit further includes a plurality of second source driving modules.
  • Any of the first source drive modules includes a digital to analog converter, and any of the digital to analog converters includes a plurality of inputs, each of which is coupled to an output of a corresponding operational amplifier.
  • Any of the second source drive modules includes a digital to analog converter, and any of the digital to analog converters includes a plurality of inputs, each of which is coupled to an output of a corresponding operational amplifier.
  • the source driving circuit includes four first source driving modules, and any of the first source driving modules includes two operational amplifiers and a digital-to-analog converter having eight input terminals, and each input terminal is respectively connected to the corresponding The output of the op amp.
  • the source driving circuit includes two first source driving modules and two second source driving modules, and any of the first source driving modules includes four operational amplifiers and a digital to analog converter having eight inputs. Any of the second source driver modules includes a digital to analog converter having eight inputs, each of which is coupled to an output of a corresponding operational amplifier.
  • the number of operational amplifiers in any of the first source drive modules is equal.
  • connection between the source driving circuit and the gamma driving circuit is disposed on a printed circuit board.
  • a source driving circuit is provided.
  • the source driving circuit is connected to a plurality of pixel gray scale reference voltages from the gamma driving circuit and is provided with a plurality of operational amplifiers, wherein the number of pixel gray scale reference voltages is equal to the number of operational amplifiers and the operational amplifiers are connected Enter the corresponding pixel gray scale reference voltage. Therefore, the operational amplifier may not be provided in the gamma driving circuit used in conjunction with the source driving circuit, so that the heating efficiency of the gamma voltage driving circuit can be effectively reduced, the temperature of the gamma voltage driving circuit is lowered, and the driving circuit is facilitated. Integration.
  • a second aspect of the present invention provides a display device including a source driving circuit.
  • the source driving circuit accesses a plurality of pixel gray scale reference voltages from the gamma driving circuit, including:
  • each operational amplifier is connected to a corresponding pixel gray scale reference voltage.
  • FIG. 1 is a schematic structural view 1 of a source driving circuit according to an embodiment of the present invention.
  • FIG. 2 is a second schematic structural diagram of a source driving circuit according to an embodiment of the present invention.
  • FIG. 3 is a third schematic structural diagram of a source driving circuit according to an embodiment of the present invention.
  • a source driving circuit is provided.
  • the source driving circuit is connected to a plurality of pixel gray scale reference voltages from a gamma driving circuit. As shown in FIG. 1 , the source driving circuit includes:
  • a plurality of operational amplifiers the number of operational amplifiers being equal to the number of grayscale reference voltages of the pixels output by the gamma driving circuit, and each operational amplifier is connected to a corresponding pixel grayscale reference voltage.
  • the gamma drive circuit of the display device should output an 8-pixel gray scale reference voltage. Therefore, correspondingly, as shown in FIG. 1, the source driving circuit is provided with eight operational amplifiers, and each operational amplifier is connected to a different, corresponding pixel gray scale reference voltage. Thereafter, each operational amplifier connects the amplified gray scale reference voltage of the pixel to the resistor divider circuit.
  • the pixel gray scale reference voltage outputs a corresponding positive polarity pixel gray scale reference voltage and a negative polarity pixel gray scale reference voltage from the respective voltage output points through the action of the positive polarity DC voltage and the negative polarity DC voltage through the resistor divider circuit.
  • the digital-to-analog converter of the source driving circuit further converts the received digital signal into a corresponding analog voltage according to the positive polarity gray scale reference voltage or the negative polarity gray scale reference voltage,
  • the analog voltage can directly drive the corresponding pixel of the display device to display the corresponding gray scale.
  • a source driving circuit is provided.
  • the source driving circuit is connected to a plurality of pixel gray scale reference voltages from the gamma driving circuit and is provided with a plurality of operational amplifiers, wherein the number of pixel gray scale reference voltages is equal to the number of operational amplifiers and the operational amplifiers are connected Enter the corresponding pixel gray scale reference voltage. Therefore, the operational amplifier may not be provided in the gamma driving circuit used in conjunction with the source driving circuit, so that the heating efficiency of the gamma voltage driving circuit can be effectively reduced, the temperature of the gamma voltage driving circuit is lowered, and the driving circuit is facilitated. Integration.
  • resistors there are multiple resistors connected in series between the voltage output point +V 255 and +V m in Figure 1.
  • the number of resistors in series is determined by the value of m, where m is a natural number (voltage output point -V m is the same). For example, if m is 250, then there should be 5 resistors in series between +V 255 and +V m for series voltage division to obtain another 4 voltage output points +V 254 , +V 253 , +V 252 and +V 251 The voltage value of the output.
  • the resistance value of each resistor can be selected according to the value of the grayscale reference voltage of each pixel required by the display device.
  • n of the voltage output point +V n or -V n in FIG. 1 is a natural number less than m greater than 0.
  • the liquid crystal molecules are subjected to an electric field in the same direction for a long time, and the liquid crystal molecules are deteriorated. Even if the application of a voltage to the liquid crystal molecules is stopped, the light transmittance of the liquid crystal may not be restored to the light transmittance before the application of the voltage, resulting in a serious phenomenon such as residual image sticking of the liquid crystal display device. Therefore, in order to prevent deterioration of liquid crystal molecules, it is necessary to constantly change the direction of the electric field applied to the liquid crystal molecules. This requires the source driving circuit to provide an alternating driving voltage so that the direction of the electric field applied to the liquid crystal molecules can be changed so that the liquid crystal molecules can be deflected in opposite directions.
  • the source driving circuit can provide a positive polarity pixel gray scale reference voltage and a negative polarity pixel gray scale reference voltage corresponding to any gray scale, for example, both providing +V m and providing -V m .
  • the source driving circuit includes a plurality of first source driving modules, wherein the plurality of operational amplifiers are included in the plurality of first source driving modules. That is, as shown in FIG. 2, for example, the gamma driving circuit of the display device can output eight pixel gray scale reference voltages, and eight operational amplifiers should have one-to-one correspondence with the eight pixel gray scale reference voltages.
  • the source driving circuit includes four first source driving modules, and eight operational amplifiers are respectively placed in corresponding first source driving modules, and the eight operational amplifiers can be evenly distributed in four first source driving In the module, that is, each of the first source driving modules includes two operational amplifiers.
  • each of the first source driving modules further includes a digital-to-analog converter having eight inputs, and each input terminal is respectively connected to an output terminal of the corresponding operational amplifier.
  • Placing multiple operational amplifiers in different first source driver modules can reduce the concentration of the operational amplifier, promote the heat dissipation of the operational amplifier, and lower the temperature of each operational amplifier.
  • the number of the operational amplifiers in each of the first source driving modules may not be equal, and may be set according to actual conditions, which is not limited in the embodiment of the present invention.
  • each operational amplifier is connected to one output terminal of the gamma voltage driving circuit.
  • the operational amplifier connected to the output terminal out1 of the gamma voltage driving circuit is named OP1, and so on.
  • the four operational amplifiers OP1 and OP2, OP3 and OP4, OP5 and OP6, OP7 and OP8 are placed in different first source driver modules.
  • each of the first source driving modules includes a digital-to-analog converter with eight inputs, in order to ensure that each input terminal of the digital-to-analog converter is respectively connected to the output of the corresponding operational amplifier, including OP1 and
  • the first source driver module of OP2 needs to access the outputs from OP3 and OP4, OP5 and OP6, OP7 and OP8.
  • the first source driver module including OP3 and OP4 needs to access the outputs from OP3 and OP4, OP5 and OP6, OP7 and OP8, and the first source driver module including OP5 and OP6 needs to access from OP1 and OP2.
  • the source driving circuit includes not only a plurality of first source driving modules but also a plurality of second source driving modules.
  • any of the second source driving modules does not include an operational amplifier.
  • any of the second source drive modules includes a digital to analog converter, and any of the digital to analog converters includes a plurality of inputs, each of which is coupled to an output of a corresponding operational amplifier.
  • the source driving circuit includes two first source driving modules and two second source driving modules, and any of the first source driving modules includes four operational amplifiers and one has 8 input digital to analog converters, any second source drive module includes a digital to analog converter with 8 inputs, each input of any digital to analog converter is connected to the output of the corresponding operational amplifier .
  • each operational amplifier is connected to an output of the gamma voltage drive circuit.
  • the operational amplifier connected to the output terminal out1 of the gamma voltage drive circuit is named OP1, and so on.
  • OP1, OP2, OP3 and OP4 are placed in one first source driving module, and the remaining OP5, OP6, OP7 and OP8 are placed in another first source driving module.
  • the module needs to access the outputs from OP5, OP6, OP7 and OP8.
  • the first source driver module including OP5, OP6, OP7 and OP8 needs to access the outputs from OP1, OP2, OP3 and OP4, each of the second sources.
  • the driver circuit needs to access the output from each op amp.
  • FIG. 2 and FIG. 3 are only specific implementation scenarios in the embodiment of the present invention, and the operation mode of the operational amplifier, the number of the first source driving modules, and the number of the second source driving modules need to be performed according to actual conditions.
  • the embodiment of the present invention does not limit this.
  • setting an appropriate number of operational amplifiers in the first source driving module does not increase the cost of the first source driving module, that is, the cost of the first source driving module provided with several operational amplifiers.
  • the cost is similar to that of the second source driver module that is not provided with an operational amplifier. Moving the operational amplifier originally set in the gamma drive circuit out of the gamma drive circuit can reduce the manufacturing cost of the gamma drive circuit by about 20%. Therefore, placing the operational amplifier in the first source driving module also contributes to reducing the manufacturing cost of the display device.
  • the source driving circuit adopts a chip on-film (COF) manufacturing process, that is, an integrated circuit chip integrated with a source driving circuit is fixed on a flexible circuit board. It is a technology that uses a soft additional circuit board as a package chip carrier to bond the chip to the flexible substrate circuit. Since the COF can only support single-layer traces, that is, the lines cannot be crossed or they will be short-circuited.
  • the gamma driver circuit is usually disposed on a Printed Circuit Board (PCB) and can be connected through multiple layers. Therefore, the connection between the gamma drive circuit and the respective modules of the source drive circuit can be set on the PCB for convenient implementation.
  • PCB Printed Circuit Board
  • an embodiment of the present invention further provides a display device including the source driving circuit described above.
  • the display device may be a display device such as a liquid crystal display device, an electronic paper, an organic light-emitting diode (OLED) display device, or the like, and a television, a data camera, a mobile phone, a tablet computer, etc. including the display device.

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  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Computer Hardware Design (AREA)
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  • Liquid Crystal Display Device Control (AREA)
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Abstract

一种源极驱动电路，该源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压，且包括：若干个运算放大器，运算放大器的个数与伽马驱动电路所输出的像素灰阶参考电压的个数相等，各运算放大器接入对应的像素灰阶参考电压。该源极驱动电路可有效降低伽马驱动电路的发热效率及温度，有利于伽马驱动电路与其他驱动电路的整合。

Description

一种源极驱动电路及显示装置
本申请要求享有2014年9月16日提交的名称为“一种源极驱动电路及显示装置”的中国专利申请CN201410471908.0的优先权，其全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，具体地说，涉及一种源极驱动电路及显示装置。
背景技术
薄膜晶体管液晶显示器的显示面板上具有多个像素单元，每一像素单元至少具有红色、绿色和蓝色三个亚像素。每一亚像素所呈现的亮度由伽马(Gamma)电压所决定。
伽马电压驱动电路的作用是根据液晶显示器所要求的伽马曲线，来设定伽马电压，作为薄膜晶体管液晶显示器进行灰阶显示的参考电压。将各个伽马电压输入到薄膜晶体管液晶显示器的源极驱动器中，经过源极驱动电路中的数模转换器，产生所有灰度电压。
发明人发现，现有的伽马电压驱动电路包括多个数字模拟转换器(Digital to Analog Converter，简称DAC)和多个运算放大器(Operational Amplifier，简称OP)，每个DAC连接到相应的一个OP。DAC将接收到的用于产生像素灰阶参考电压的数字信号转换为模拟信号，OP将DAC处理后的模拟信号放大转换作为像素灰阶参考电压输出到源极驱动电路中。由于OP的跨压比较大，因此OP的功耗比较大，发热效率高，导致伽马电压驱动电路温度升高，不利于与其他驱动电路的整合。
发明内容
本发明的目的在于提供一种源极驱动电路及显示装置，可有效降低配合该源极驱动电路的伽马电压驱动电路的发热效率，降低伽马电压驱动电路的温度，有利于该伽马电路驱动电路与其他驱动电路的整合。
本发明第一方面提供了一种源极驱动电路，所述源极驱动电路接入来自伽马驱动电路 的若干个像素灰阶参考电压，包括：
若干个运算放大器，运算放大器的个数与所述伽马驱动电路所输出的像素灰阶参考电压的个数相等，各运算放大器接入对应的像素灰阶参考电压。
所述的源极驱动电路还包括数个第一源极驱动模块，所述若干个运算放大器包含于所述数个第一源极驱动模块中。
所述的源极驱动电路还包括数个第二源极驱动模块。
任一第一源极驱动模块包括数字模拟转换器，任一数字模拟转换器包括若干个输入端，每个输入端分别接入对应的运算放大器的输出端。
任一第二源极驱动模块包括数字模拟转换器，任一数字模拟转换器包括若干个输入端，每个输入端分别接入对应的运算放大器的输出端。
所述的源极驱动电路包括四个第一源极驱动模块，任一第一源极驱动模块包括二个运算放大器和一个具有八个输入端的数字模拟转换器，每个输入端分别接入对应的运算放大器的输出端。
所述的源极驱动电路包括二个第一源极驱动模块和二个第二源极驱动模块，任一第一源极驱动模块包括四个运算放大器和一个具有八个输入端的数字模拟转换器，任一第二源极驱动模块包括一个具有八个输入端的数字模拟转换器，任一数字模拟转换器的每个输入端分别接入对应的运算放大器的输出端。
任一第一源极驱动模块中的运算放大器的个数相等。
所述源极驱动电路与所述伽马驱动电路的连线设置在印刷电路板上。
本发明带来了以下有益效果：在本发明实施例的技术方案中，提供了一种源极驱动电路。该源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压并且设置有若干个运算放大器，其中，像素灰阶参考电压的个数与运算放大器的个数相等且各运算放大器接入对应的像素灰阶参考电压。因此，与该源极驱动电路配合使用的伽马驱动电路中可不设置运算放大器，如此可有效降低伽马电压驱动电路的发热效率，降低伽马电压驱动电路的温度，有利于其与其他驱动电路的整合。
本发明第二方面提供了一种显示装置，包括源极驱动电路。所述源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压，包括：
若干个运算放大器，运算放大器的个数与所述伽马驱动电路所输出的像素灰阶参考电 压的个数相等，各运算放大器接入对应的像素灰阶参考电压。
本发明的其它特征和优点将在随后的说明书中阐述，并且，部分地从说明书中变得显而易见，或者通过实施本发明而了解。本发明的目的和其他优点可通过在说明书、权利要求书以及附图中所特别指出的结构来实现和获得。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要的附图做简单的介绍：
图1是本发明实施例提供的源极驱动电路的结构示意图一；
图2是本发明实施例提供的源极驱动电路的结构示意图二；
图3是本发明实施例提供的源极驱动电路的结构示意图三。
具体实施方式
以下将结合附图及实施例来详细说明本发明的实施方式，借此对本发明如何应用技术手段来解决技术问题，并达成技术效果的实现过程能充分理解并据以实施。需要说明的是，只要不构成冲突，本发明中的各个实施例以及各实施例中的各个特征可以相互结合，所形成的技术方案均在本发明的保护范围之内。
本实施例中提供了一种源极驱动电路，所述源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压，如图1所示，该源极驱动电路包括：
若干个运算放大器，运算放大器的个数与所述伽马驱动电路所输出的像素灰阶参考电压的个数相等，各运算放大器接入对应的像素灰阶参考电压。
假设此时显示装置的显存位宽为256位，该显示装置的伽马驱动电路应输出8个像素灰阶参考电压。因此相对应的，如图1所示，源极驱动电路设置有8个运算放大器，各个运算放大器接入不同的、对应的像素灰阶参考电压。之后，各个运算放大器将经过放大处理后的像素灰阶参考电压接到电阻分压电路中。像素灰阶参考电压通过电阻分压电路在正极性直流电压和负极性直流电压的作用，从各个电压输出点输出相应的正极性像素灰阶参考电压和负极性像素灰阶参考电压。源极驱动电路的数字模拟转换器进而将接收到的数字信号根据正极性像素灰阶参考电压或负极性像素灰阶参考电压转换为对应的模拟电压，该 模拟电压可直接驱动显示装置的对应像素显示对应的灰阶。
显然，在本发明实施例的技术方案中，提供了一种源极驱动电路。该源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压并且设置有若干个运算放大器，其中，像素灰阶参考电压的个数与运算放大器的个数相等且各运算放大器接入对应的像素灰阶参考电压。因此，与该源极驱动电路配合使用的伽马驱动电路中可不设置运算放大器，如此可有效降低伽马电压驱动电路的发热效率，降低伽马电压驱动电路的温度，有利于其与其他驱动电路的整合。
需要说明的是，图1中的电压输出点+V255和+Vm之间串联有多个电阻，具体串联的电阻的个数由m的数值确定，其中m为自然数(电压输出点-Vm同理)。例如，m为250，则此时+V255和+Vm之间应串联有5个电阻进行串联分压得到另外4个电压输出点+V254、+V253、+V252和+V251输出的电压值。并且，各个电阻的阻值大小可以根据显示装置所需的各像素灰阶参考电压的取值大小来选择。类似的，图1中的电压输出点+Vn或-Vn中的n为小于m大于0的自然数。
另外，若是液晶显示装置在工作时，液晶分子长时间受到同一方向的电场的作用，液晶分子会劣化。即使停止施加电压于该液晶分子上，亦可能出现液晶的光线穿透率无法恢复到施加电压以前的光线透过率的情形，导致液晶显示装置出现较为严重的画面残影等不良现象。因此，为了防止液晶分子劣化，需要经常改变施加于液晶分子上的电场方向。这就需要源极驱动电路能够提供交流驱动电压，从而可以改变施加于液晶分子上的电场方向，使得液晶分子能够向相反的方向偏转。因此，如图1所示，源极驱动电路能够提供任一灰阶对应的正极性像素灰阶参考电压和负极性像素灰阶参考电压，例如既能够提供+Vm也可提供-Vm。
在本发明实施例的一个具体实施方式中，该源极驱动电路包括多个第一源极驱动模块，其中，若干个运算放大器包含于数个第一源极驱动模块中。即如图2所示，例如该显示装置的伽马驱动电路能够输出8个像素灰阶参考电压，则应有8个运算放大器与该8个像素灰阶参考电压一一对应。该源极驱动电路包括有4个第一源极驱动模块，将8个运算放大器分别放置在对应的第一源极驱动模块中，该8个运算放大器可平均分布在4个第一源极驱动模块中，即每一第一源极驱动模块包括2个运算放大器。另外，每一第一源极驱动模块中还包括具有8个输入端的数字模拟转换器，并且，每个输入端分别接入对应的运算放大器的输出端。
将多个运算放大器分别放置在不同的第一源极驱动模块中，可降低运算放大器的密集程度，促进运算放大器的散热，降低各运算放大器的温度。
需要说明的是，每一个第一源极驱动模块中的运算放大器的个数也可以不相等，具体应根据实际情况进行设置，本发明实施例对此不进行限制。
具体的，如图2所示，每一个运算放大器连接至伽马电压驱动电路的一个输出端，为了便于描述，将连接至伽马电压驱动电路的输出端out1的运算放大器命名为OP1，其余类推。在图2中，OP1和OP2、OP3和OP4、OP5和OP6、OP7和OP8这4组运算放大器被分别放置在不同的第一源极驱动模块中。由于每一第一源极驱动模块均包括有一个8个输入端的数字模拟转换器，因此，为了保证该数字模拟转换器的每个输入端分别接入对应的运算放大器的输出端，包括OP1和OP2的第一源极驱动模块需要接入来自OP3和OP4、OP5和OP6、OP7和OP8的输出。类似的，包括OP3和OP4的第一源极驱动模块需要接入来自OP3和OP4、OP5和OP6、OP7和OP8的输出，包括OP5和OP6的第一源极驱动模块需要接入来自OP1和OP2、OP3和OP4、OP7和OP8的输出，包括OP7和OP8的第一源极驱动模块需要接入来自OP1和OP2、OP3和OP4、OP5和OP6的输出
需要说明的是，为了保证图2能清楚显示第一源极驱动模块中的数字模拟转换器和各个运算放大器的连接关系，仅将包括OP1和OP2的第一源极驱动模块接入其他运算放大器的走线画出作为示例，其余可依此类推，因此略去不画。
在本发明实施例的另一个具体实施方式中，该源极驱动电路不仅包括多个第一源极驱动模块，还包括多个第二源极驱动模块。其中，任一第二源极驱动模块不包括有运算放大器。但是任一第二源极驱动模块包括数字模拟转换器，任一数字模拟转换器包括若干个输入端，每个输入端分别接入对应的运算放大器的输出端。
具体的，如图3所示，该源极驱动电路，包括2个第一源极驱动模块和2个第二源极驱动模块，任一第一源极驱动模块包括4个运算放大器和一个具有8个输入端的数字模拟转换器，任一第二源极驱动模块包括一个具有8个输入端的数字模拟转换器，任一数字模拟转换器的每个输入端分别接入对应的运算放大器的输出端。与前文类似的，每一个运算放大器连接至伽马电压驱动电路的一个输出端，为了便于描述，将连接至伽马电压驱动电路的输出端out1的运算放大器命名为OP1，其余类推。此时，OP1、OP2、OP3和OP4放置在一个第一源极驱动模块中，其余的OP5、OP6、OP7和OP8放置在另一个第一源极驱动模块中。显然，如图3所示，此时包括OP1、OP2、OP3和OP4的第一源极驱动 模块需要接入来自OP5、OP6、OP7和OP8的输出，包括OP5、OP6、OP7和OP8的第一源极驱动模块需要接入来自OP1、OP2、OP3和OP4的输出，每一个第二源极驱动电路都需要接入来自各运算放大器的输出。
需要说明的是，为了保证图3能清楚显示第一源极驱动模块中的数字模拟转换器和各个运算放大器的连接关系，仅将包括OP1、OP2、OP3和OP4的第一源极驱动模块接入其他运算放大器的走线画出作为示例，另一个第一源极驱动模块可依此类推，因此略去不画。
显然，图2和图3仅为本发明实施例中的具体实施场景，运算放大器的放置方式、第一源极驱动模块的个数、第二源极驱动模块的个数等需要根据实际情况进行调整，本发明实施例对此不进行限制。
需要说明的是，在第一源极驱动模块里设置适当的个数的运算放大器并不会增大第一源极驱动模块的成本，即设置有数个运算放大器的第一源极驱动模块的成本与未设置有运算放大器的第二源极驱动模块的成本相近。而将原本设置在伽马驱动电路中的运算放大器移出伽马驱动电路，可以降低20％左右的伽马驱动电路的制作成本。因此，将运算放大器放置在第一源极驱动模块里，还有利于降低显示装置的制作成本。
由于一般来说源极驱动电路采用的是覆晶薄膜(Chip On Film，简称COF)的制作工艺，即将集成有源极驱动电路的集成电路芯片固定于柔性线路板上晶粒软膜构装技术，是运用软质附加电路板作封装芯片载体将芯片与软性基板电路接合的技术。由于COF只能支持单层走线，即线路不能交叉否则会短路。而伽马驱动电路通常都设置在印刷电路板(Printed Circuit Board，简称PCB)上，能通过多层设置实现连接。因此，伽马驱动电路和源极驱动电路的各个模块之间的连线可设置在PCB上，实现方便。
进一步的，本发明实施例还提供了一种显示装置，该显示装置包括上述的源极驱动电路。其中，该显示装置可以为液晶显示装置、电子纸、有机发光二极管(Organic Light-Emitting Diode，简称OLED)显示装置等显示器件以及包括这些显示器件的电视、数据相机、手机、平板电脑等任何具有显示功能的产品或者部件。
虽然本发明所公开的实施方式如上，但所述的内容只是为了便于理解本发明而采用的实施方式，并非用以限定本发明。任何本发明所属技术领域内的技术人员，在不脱离本发明所公开的精神和范围的前提下，可以在实施的形式上及细节上作任何的修改与变化，但本发明的专利保护范围，仍须以所附的权利要求书所界定的范围为准。

Claims (10)

  1. 一种源极驱动电路，所述源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压，其中，包括：
    若干个运算放大器，运算放大器的个数与所述伽马驱动电路所输出的像素灰阶参考电压的个数相等，各运算放大器接入对应的像素灰阶参考电压。
  2. 根据权利要求1所述的源极驱动电路，其中，还包括数个第一源极驱动模块，所述若干个运算放大器包含于所述数个第一源极驱动模块中。
  3. 根据权利要求2所述的源极驱动电路，其中，还包括数个第二源极驱动模块。
  4. 根据权利要求2所述的源极驱动电路，其中，任一第一源极驱动模块包括数字模拟转换器，任一数字模拟转换器包括若干个输入端，每个输入端分别接入对应的运算放大器的输出端。
  5. 根据权利要求3所述的源极驱动电路，其中，任一第二源极驱动模块包括数字模拟转换器，任一数字模拟转换器包括若干个输入端，每个输入端分别接入对应的运算放大器的输出端。
  6. 根据权利要求4所述的源极驱动电路，其中，包括四个第一源极驱动模块，任一第一源极驱动模块包括二个运算放大器和一个具有八个输入端的数字模拟转换器，每个输入端分别接入对应的运算放大器的输出端。
  7. 根据权利要求5所述的源极驱动电路，其中，包括二个第一源极驱动模块和二个第二源极驱动模块，任一第一源极驱动模块包括四个运算放大器和一个具有八个输入端的数字模拟转换器，任一第二源极驱动模块包括一个具有八个输入端的数字模拟转换器，任一数字模拟转换器的每个输入端分别接入对应的运算放大器的输出端。
  8. 根据权利要求2所述的源极驱动电路，其中，任一第一源极驱动模块中的运算放大器的个数相等。
  9. 根据权利要求1所述的源极驱动电路，其中，所述源极驱动电路与所述伽马驱动电路的连线设置在印刷电路板上。
  10. 一种显示装置，其中，包括源极驱动电路，所述源极驱动电路接入来自伽马驱动电路的若干个像素灰阶参考电压，所述源极驱动电路包括：
    若干个运算放大器，运算放大器的个数与所述伽马驱动电路所输出的像素灰阶参考电压的个数相等，各运算放大器接入对应的像素灰阶参考电压。
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