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CN111899698A - 基于双基准电压的显示面板 - Google Patents

基于双基准电压的显示面板 Download PDF

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Publication number
CN111899698A
CN111899698A CN202010557431.3A CN202010557431A CN111899698A CN 111899698 A CN111899698 A CN 111899698A CN 202010557431 A CN202010557431 A CN 202010557431A CN 111899698 A CN111899698 A CN 111899698A
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Prior art keywords
vcom
gamma
voltage
reference voltage
display panel
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王磊
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Nanjing Guanhai Microelectronic Co ltd
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Nanjing Guanhai Microelectronic Co ltd
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Priority to CN202010557431.3A priority Critical patent/CN111899698A/zh
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    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20Control 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
    • G09G3/34Control 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
    • G09G3/36Control 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
    • G09G3/3611Control of matrices with row and column drivers
    • G09G3/3696Generation of voltages supplied to electrode drivers
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2330/00Aspects of power supply; Aspects of display protection and defect management
    • G09G2330/02Details of power systems and of start or stop of display operation

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

Abstract

本发明公开了一种基于双基准电压的显示面板,包括正负两个直流基准电压P‑vcom和N‑vcom;正负源极曲线P‑gamma和N‑gamma在同一个电压域,且,P‑gamma和N‑gamma都在P‑vcom和N‑vcom之间。显示面板内像素点的基准电压极性随源极电压极性变化而翻转,正源极P‑gamma对应正基准电压P‑vcom,负源极N‑gamma对应负基准电压N‑vcom。本发明电源电压只需现有系统的一半,功耗大幅减低,发热明显缓解;电源驱动系统结构简单,功耗低,电路和版图都有优化空间,成本低。

Description

基于双基准电压的显示面板
技术领域
本发明涉及液晶显示领域,尤其涉及一种基于双基准电压的显示面板。
背景技术
现有的显示面板(panel)都是采用单一的基准电压vcom。又细分为两种:一种是直流基准电压DC-vcom,vcom电压不变;一种是交流基准电压AC-vcom,vcom电压每行翻转一次,在vcom1和vcom2之间切换。
如图1所示,为直流基准电压中基准电压vcom与正负源极gamma的关系。如图2所示,为直流基准电压的电源输出波形。一个极性液晶包括奇帧:P-gamma–Vcom,偶帧:Vcom-N-gamm;另一个极性液晶包括奇帧:Vcom-N-gamma,偶帧:P-gamma–Vcom。
直流基准电压DC-vcom要求电源输出范围比较大,因为电源要保证相邻帧极性相反,如果常时间极性不变会造成液晶极化,因此直流基准电压的电源电压输出基本是交流基准电压的电源电压两倍,因为电压比较高,相同负载前提下,电源功耗比较高,但显示效果好,是目前的主流架构。
交流基准电压AC-vcom中,因为vcom在翻转,电源输出电压范围比较小,但显示效果没有DC-vcom的效果好,因此现在只存在于很小的显示面板应用中,比如1.8寸以下。
现在大型显示面板越来越大,电源驱动的功耗越来越大,发热问题越来越严重。而小型系统对功耗也很敏感,希望可以降低功耗。
发明内容
发明目的:针对以上问题,本发明提出一种基于双基准电压的显示面板,可有效降低电源功耗。
技术方案:为实现本发明的目的,本发明所采用的技术方案是:一种基于双基准电压的显示面板,包括正负两个直流基准电压P-vcom和N-vcom;正负源极曲线P-gamma和N-gamma在同一个电压域,且,P-gamma和N-gamma都在P-vcom和N-vcom之间。
进一步地,负向应用N-Vcom到N-gamma的电压同时调到P-gamma到P-vcom的电压域。
进一步地,其电源电压为单基准电压显示面板系统电源电压的一半。
进一步地,显示面板内像素点的基准电压极性随源极电压极性变化而翻转。
进一步地,正源极P-gamma对应正基准电压P-vcom,负源极N-gamma对应负基准电压N-vcom。
有益效果:本发明电源电压只需现有系统的一半,功耗大幅减低,发热明显缓解;电源驱动系统结构简单,功耗低,电路和版图都有优化空间,成本低。
附图说明
图1是现有技术中单一基准电压与正负gamma的关系曲线图;
图2是现有技术中单一基准电压的电源输出波形图;
图3是本发明所述的基于双基准电压的正负gamma曲线图;
图4是本发明所述的基于双基准电压的电源输出波形图;
图5是翻转方式示意图;
图6是子像素源极电压与基准电压的变化曲线图。
具体实施方式
下面结合附图和实施例对本发明的技术方案作进一步的说明。
如图3所示,本发明所述的基于双基准电压的显示面板,包括正负两个直流基准电压P-vcom和N-vcom;正负源极曲线P-gamma和N-gamma在同一个电压域,且,P-gamma和N-gamma都在P-vcom和N-vcom之间。
现有技术中的单一直流基准电压dc-vcom,源极要在正负gamma之间切换,电压范围是本发明的两倍。本发明因为电源输出范围小,所以电源电压可以减半,在相同负载前提下,大大降低了电源功耗。
因为p-gamma和n-gamma都在相同的电压域,电路架构也简单很多,正负gamma相关的电路可以放在同一个电压域,电源驱动电路更简单,其他不变的前提下,可以缩小尺寸,降低成本。
如图4所示,双基准电压显示面板系统中源极电压和基准电压的波形图,实线和虚线分别是奇数帧和偶数帧的波形,可以看出,它们虽然都需要正负gamma,但因为对应的vcom变了,摆幅并没有翻倍。
一个极性奇帧:P-gamma’–P-vcom,偶帧:N-vcom-N-gamma’;另一个极性奇帧:N-Vcom-N-gamma’,偶帧:P-gamma’–P-Vcom。因此,只要P-gamma–Vcom=P-gamma’–P-vcom;同时Vcom–N-gamma=N-vcom–N-gamma’,对液晶分子就可以达到相同的效果。
本发明只是把Vcom拆成两个,对于负向应用N-Vcom到N-gamma的电压同时调到P-gamma到P-vcom的电压域而已。
本发明的具体工作原理如下:系统增加一个基准电压vcom输入,共有两个直流基准电压dc-vcom输入,源极输出电压摆幅是现有单一基准电压dc-vcom系统的一半。显示面板内部,像素点内的vcom不是不变的,随源极极性变化而变化,因此系统内要增加控制电路控制像素内vcom的极性变化。
如图5所示,系统的翻转方式和现有的单一vcom相同,可以是帧翻,也可以是行反,也可以是两行一翻,或者四行一翻。
如图6所示,为每个子像素点源极和基准电压vcom的电压变化曲线,源极输出p-gamma时,该子像素点(pixel)的vcom电压是p-vcom;源极输出n-gamma时,该像素点的vcom是n-vcom。所以虽然系统是两个直流基准电压dc-vcom,但对于每个子像素,vcom电压是随着电源输出到该子像素的gamma极性一起翻转的。

Claims (5)

1.一种基于双基准电压的显示面板,其特征在于,包括正负两个直流基准电压P-vcom和N-vcom;正负源极曲线P-gamma和N-gamma在同一个电压域,且,P-gamma和N-gamma都在P-vcom和N-vcom之间。
2.根据权利要求1所述的基于双基准电压的显示面板,其特征在于,负向应用N-Vcom到N-gamma的电压同时调到P-gamma到P-vcom的电压域。
3.根据权利要求1所述的基于双基准电压的显示面板,其特征在于,其电源电压为单基准电压显示面板系统电源电压的一半。
4.根据权利要求1所述的基于双基准电压的显示面板,其特征在于,显示面板内像素点的基准电压极性随源极电压极性变化而翻转。
5.根据权利要求4所述的基于双基准电压的显示面板,其特征在于,正源极P-gamma对应正基准电压P-vcom,负源极N-gamma对应负基准电压N-vcom。
CN202010557431.3A 2020-06-18 2020-06-18 基于双基准电压的显示面板 Pending CN111899698A (zh)

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US20050088392A1 (en) * 2003-10-23 2005-04-28 Chang-Gone Kim Liquid crystal display device and method of driving the same
US20070229431A1 (en) * 2006-04-04 2007-10-04 Won-Sik Kang Display panel and method of driving display panel using inversion driving method
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TW200849179A (en) * 2007-06-05 2008-12-16 Himax Tech Ltd Display apparatus and two step driving method thereof
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050088392A1 (en) * 2003-10-23 2005-04-28 Chang-Gone Kim Liquid crystal display device and method of driving the same
US20070229431A1 (en) * 2006-04-04 2007-10-04 Won-Sik Kang Display panel and method of driving display panel using inversion driving method
CN101196629A (zh) * 2006-12-07 2008-06-11 Lg.菲利浦Lcd株式会社 液晶显示器件及其驱动方法
JP2008164849A (ja) * 2006-12-27 2008-07-17 Lg Display Co Ltd 液晶表示装置
TW200849179A (en) * 2007-06-05 2008-12-16 Himax Tech Ltd Display apparatus and two step driving method thereof
TW201124974A (en) * 2010-01-11 2011-07-16 Innolux Display Corp Liquid crystal display device
CN104658496A (zh) * 2013-11-25 2015-05-27 乐金显示有限公司 显示装置
CN104698645A (zh) * 2015-03-31 2015-06-10 合肥京东方光电科技有限公司 一种显示面板及其驱动方法、液晶显示装置
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Application publication date: 20201106