CN114141202A - 微显示有源像素电路 - Google Patents

微显示有源像素电路 Download PDF

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CN114141202A
CN114141202A CN202111468066.XA CN202111468066A CN114141202A CN 114141202 A CN114141202 A CN 114141202A CN 202111468066 A CN202111468066 A CN 202111468066A CN 114141202 A CN114141202 A CN 114141202A
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CN114141202B (zh
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安晓庆
吴迪
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Hupan Photoelectric Technology Jiangsu Co ltd
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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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3233—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the current through the light-emitting element
    • 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
    • G09G3/22—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 using controlled light sources
    • G09G3/30—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 using controlled light sources using electroluminescent panels
    • G09G3/32—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED]
    • G09G3/3208—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED]
    • G09G3/3225—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix
    • G09G3/3258—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 using controlled light sources using electroluminescent panels semiconductive, e.g. using light-emitting diodes [LED] organic, e.g. using organic light-emitting diodes [OLED] using an active matrix with pixel circuitry controlling the voltage across the light-emitting element

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Abstract

本发明涉及电子电路技术领域，具体涉及微显示有源像素电路。本发明提供微显示有源像素电路，包括Timing controller模块，Timing controller模块分别与Source driver模块和Gate driver模块电连接，Source driver模块和Gate driver模块均与显示板电连接，Gamma Voltages模块和Memory模块均连接Source driver模块，Source driver模块与Memory模块通信连接。本发明通过采用的DAC模块转化为稳定电流，配合与门使得像素电流稳定，以及提高像素一致性。

Description

微显示有源像素电路
技术领域
本发明涉及电子电路技术领域，具体涉及微显示有源像素电路。
背景技术
微型发光二极管 (micro OLED) 显示器是最有前途的下一代显示器，可用在根据驱动方式不同可分为无源驱动(PMOLED)和有源驱动(AMOLED)。
OLED微型显示器芯片有广泛的应用，在军用市场方面，主要用于军工红外枪瞄显示器、数字单兵头盔显示器、军用红外、夜视仪、3D模拟训练及5G虚拟现实、增强现实技术应用。同时，在5G技术条件下，该技术具有广阔的民用市场。在AR/VR领域，可用于移动互联网终端显示系统、3D眼镜、虚拟游戏系统等；在消费类电子领域，可用于车载平视显示器（HUD）、高端数码相机取景器（EVF）、近距离投影仪等；在行业应用上，可用于消防、反恐、远程教育培训、远程医疗（如医内窥视镜等）、工业维修检测等。
有源驱动适用于高分辨率显示器，但由于晶体管和OLED的电特性变化，它在每个像素中会遇到亮度不均匀和灰度精度差及温漂较大的问题。
现有技术中，AMOLED常采用电压型DAC对像素电路提供电压和电流，DAC的精度会严重影响像素电流的稳定性。
发明内容
本发明的目的是为了解决现有技术的缺点，而提出了微显示有源像素电路。
本发明提供了如下的技术方案：
微显示有源像素电路，包括显示板、Source driver模块、Gate driver模块和Timing controller模块，所述Timing controller模块分别与所述Source driver模块和所述Gate driver模块电连接，所述Source driver模块和所述Gate driver模块均与所述显示板电连接，Gamma Voltages模块和Memory模块均连接所述Source driver模块，所述Source driver模块与所述Memory模块通信连接；
所述显示板，用于承载多个像素单元并基于接收的信号显示图像，包括与门电路，所述与门电连接像素单元；
所述Source driver模块，用于接收时序信号和RGB数据，以及将所述RGB数据转化成提供给像素电路的电压；
所述Gate driver模块，用于接收时序信号，以及根据接收的时序信号生成门信号；
所述Timing controller模块，时序控制器用于分别产生多个预设的时钟信号，该多个预设的时钟信号分别通过该多个输出端口发送给与所述Timing controller模块电连接的其他模块。
优选的，Source driver模块包括Shift registers and latches模块、DAC模块、Buffer模块和基准模块，所述Shift registers and latches模块与所述DCA模块电连接，所述DAC模块与所述Buffer模块电连接；
所述Shift registers and latches模块，用于接收视频信号数据并进行锁存；
所述DAC模块，用于接收视频信号数据并生成输出电压，以及将DAC模块的输出电压提供给所述Buffer模块；
所述Buffer模块，用于接收经DAC模块的输出电压并将输出电压的电压值转化成电流值，以及将所述Buffer模块的输出电流提供给所述显示板；
所述基准模块，用于提供基准信号，所述准基模块采用Reference voltage模块或Current generator模块。
优选的，所述DAC模块采用二进制码和温度计码结合的电流型DAC模块。
优选的，所述DAC接收的是视频信号数据来源于Shift registers and latches模块接收的视频信号数据或者Memory模块存储的数据。
优选的，所述Shift registers and latches模块接收的视频信号数据为外部输入的RGB数据。
优选的，所述准基电路采用准基电压电路或电流产生电路；
所述准基电压电路，用于将输出信号的振幅固定为规定的大小；
所述电流产生电路，用于产生基准电流并与经所述DAC转化的电流比较，为提供补偿电压做辅助参考。
优选的，所述像素电路还分别与时钟信号产生电路和数字电路模块电连接；
时钟信号产生电路，用于生成时钟信号，并被所述Timing controller模块使用接收RGB数据信号并以及输出时钟信号至Source driver模块；
所述数字电路模块包括产生行信号的数字电路模块和产生列信号的数字电路模块。
优选的，所述数字电路模块与与门电连接，所述与门的两个输入端分别与产生行信号的数字电路模块和产生列信号的数字电路模块连接，所述与门的输出端连接传输门，所述传输门接收转化后的像素电流并根据数字电路模块产生的信号调节并输出像素电流。
优选的，所述像素电路还与Level shifter模块电连接，所述Level shifter模块用于Timing controller模块的低电平与所述像素电路的高电平转换。
优选的，所述Source driver模块与所述Memory模块电连接，且所述Sourcedriver模块连接有Gamma电压。
本发明的有益效果是：
采用电流型DAC先将接收的输入信号转化为连续的电压值，在经Buffer模块将电压值转化为电流值，实现稳定的像素电流，对电压变化或器件变化进行补偿，进而控制显示区域的点亮；
通过与门连接三个子像素，行信号和列信号通过与门输入，消除输入信号的波动或毛刺，同时减小导通电阻和电荷注入效应的影响。
附图说明
附图用来提供对本发明的进一步理解，并且构成说明书的一部分，与本发明的实施例一起用于解释本发明，并不构成对本发明的限制。在附图中：
图1是本发明的OLED架构框图；
图2是本发明的三像素电路原理图。
具体实施方式
下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅是本发明一部分实施例，而不是全部的实施例。
根据图1所示，微显示有源像素电路，包括显示板、Source driver模块、Gatedriver模块和Timing controller模块，Timing controller模块分别与Source driver模块和Gate driver模块电连接，Source driver模块和Gate driver模块均与显示板电连接，Gamma Voltages模块和Memory模块均连接Source driver模块，Source driver模块与Memory模块通信连接；
显示板，用于承载多个像素单元并基于接收的信号显示图像，包括与门电路，与门电连接像素单元；
Source driver模块，用于接收时序信号和RGB数据，以及将RGB数据转化成提供给像素电路的电压，包括Shift registers and latches模块、DAC模块、Buffer模块和基准模块，Shift registers and latches模块与DCA模块电连接，DAC模块与Buffer模块电连接；
Buffer模块，用于接收经DAC模块的输出电压并将输出电压的电压值转化成电流值，以及将Buffer模块的输出电流提供给显示板；
基准模块，用于提供基准信号，准基模块采用Reference voltage模块或Currentgenerator模块。
Gate driver模块，用于接收时序信号，以及根据接收的时序信号生成门信号；
Timing controller模块，时序控制器用于分别产生多个预设的时钟信号，该多个预设的时钟信号分别通过该多个输出端口发送给与Timing controller模块电连接的其他模块。
Shift registers and latches模块，用于接收视频信号数据并进行锁存；
DAC模块，用于接收视频信号数据并生成输出电压，以及将DAC模块的输出电压提供给Buffer模块。
准基电路采用准基电压电路或电流产生电路；
准基电压电路，用于将输出信号的振幅固定为规定的大小；
电流产生电路，用于产生基准电流并与经DAC转化的电流比较，为提供补偿电压做辅助参考。
像素电路还分别与时钟信号产生电路和数字电路模块电连接；
时钟信号产生电路，用于生成时钟信号，并被Timing controller模块使用接收RGB数据信号并以及输出时钟信号至Source driver模块；
数字电路模块包括产生行信号的数字电路模块和产生列信号的数字电路模块。
Source driver模块与Memory模块电连接，且Source driver模块连接有Gamma电压。
当Source driver模块中的Shift registers and latches模块接收输入的RGB数据信号，并将数据信号通过DAC模块转化为模拟信号后输出。在Timing controller模块的时钟信号控制下的准基模块为输出的模拟信号提供一定的校正、补偿，在校正、补偿后经过电连接的Buffer模块输出相应的电流值。
而电路中所选用的DAC模块为二进制码和温度计码结合的电流型DAC，提高了模拟信号的精度，形成稳定的像素电流。
根据图2所示，数字电路模块与与门电连接，与门的两个输入端分别与产生行信号的数字电路模块和产生列信号的数字电路模块连接，与门的输出端连接传输门，传输门接收转化后的像素电流并根据数字电路模块产生的信号调节并输出像素电流。
像素电路还与Level shifter模块电连接，Level shifter模块用于Timingcontroller模块的低电平与像素电路的高电平转换。
Timing controller模块产生时钟信号及控制信号，在数字电路模块接收时钟信号和控制信号后，两个数字电路模块分别产生行信号和列信号，行信号和列信号同时选通即与门的输入端均输入高电平，与门的输出端输出信号为高电平。同时与门连接三个子像素，三个子像素分别为R像素、G像素、B像素。三个子像素的像素电路分别与与门之间设有传输门，传输门采用MOS管并联运行，因此将导通电阻视为常数即减少导通电阻，同时对于电荷注入效应起到一定的缓解作用，使得子像素的一致性得到提高。
以上所述仅为本发明的优选实施例而已，并不用于限制本发明，尽管参照前述实施例对本发明进行了详细的说明，对于本领域的技术人员来说，其依然可以对前述各实施例所记载的技术方案进行修改，或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (10)

1.微显示有源像素电路，其特征在于，包括显示板、Source driver模块、Gate driver模块和Timing controller模块，所述Timing controller模块分别与所述Source driver模块和所述Gate driver模块电连接，所述Source driver模块和所述Gate driver模块均与所述显示板电连接，Gamma Voltages模块和Memory模块均连接所述Source driver模块，所述Source driver模块与所述Memory模块通信连接；
所述显示板，用于承载多个像素单元并基于接收的信号显示图像，包括与门电路，所述与门电连接像素单元；
所述Source driver模块，用于接收时序信号和RGB数据，以及将所述RGB数据转化成提供给像素电路的电压；
所述Gate driver模块，用于接收时序信号，以及根据接收的时序信号生成门信号；
所述Timing controller模块，时序控制器用于分别产生多个预设的时钟信号，该多个预设的时钟信号分别通过该多个输出端口发送给与所述Timing controller模块电连接的其他模块。
2.根据权利要求1所述的微显示有源像素电路，其特征在于，Source driver模块包括Shift registers and latches模块、DAC模块、Buffer模块和基准模块，所述Shiftregisters and latches模块与所述DCA模块电连接，所述DAC模块与所述Buffer模块电连接；
所述Shift registers and latches模块，用于接收视频信号数据并进行锁存；
所述DAC模块，用于接收视频信号数据并生成输出电压，以及将DAC模块的输出电压提供给所述Buffer模块；
所述Buffer模块，用于接收经DAC模块的输出电压并将输出电压的电压值转化成电流值，以及将所述Buffer模块的输出电流提供给所述显示板；
所述基准模块，用于提供基准信号，所述准基模块采用Reference voltage模块或Current generator模块。
3.根据权利要求2所述的微显示有源像素电路，其特征在于，所述DAC模块采用二进制码和温度计码结合的电流型DAC模块。
4.根据权利要求3所述的微显示有源像素电路，其特征在于，所述DAC接收的是视频信号数据来源于Shift registers and latches模块接收的视频信号数据或者Memory模块存储的数据。
5.根据权利要求4所述的微显示有源像素电路，其特征在于，所述Shift registersand latches模块接收的视频信号数据为外部输入的RGB数据。
6.根据权利要求2所述的微显示有源像素电路，其特征在于，所述准基电路采用准基电压电路或电流产生电路；
所述准基电压电路，用于将输出信号的振幅固定为规定的大小；
所述电流产生电路，用于产生基准电流并与经所述DAC转化的电流比较，为提供补偿电压做辅助参考。
7.根据权利要求1所述的微显示有源像素电路，其特征在于，所述像素电路还分别与时钟信号产生电路和数字电路模块电连接；
时钟信号产生电路，用于生成时钟信号，并被所述Timing controller模块使用接收RGB数据信号并以及输出时钟信号至Source driver模块；
所述数字电路模块包括产生行信号的数字电路模块和产生列信号的数字电路模块。
8.根据权利要求7所述的微显示有源像素电路，其特征在于，所述数字电路模块与与门电连接，所述与门的两个输入端分别与产生行信号的数字电路模块和产生列信号的数字电路模块连接，所述与门的输出端连接传输门，所述传输门接收转化后的像素电流并根据数字电路模块产生的信号调节并输出像素电流。
9.根据权利要求1所述的微显示有源像素电路，其特征在于，所述像素电路还与Levelshifter模块电连接，所述Level shifter模块用于Timing controller模块的低电平与所述像素电路的高电平转换。
10.根据权利要求1所述的微显示有源像素电路，其特征在于，所述Source driver模块与所述Memory模块电连接，且所述Source driver模块连接有Gamma电压。
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