CN1211778A - 向列相液晶驱动方法 - Google Patents

向列相液晶驱动方法 Download PDF

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CN1211778A
CN1211778A CN 98109565 CN98109565A CN1211778A CN 1211778 A CN1211778 A CN 1211778A CN 98109565 CN98109565 CN 98109565 CN 98109565 A CN98109565 A CN 98109565A CN 1211778 A CN1211778 A CN 1211778A
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liquid crystal
nematic liquid
light transmission
driving system
institute
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CN1161729C (zh
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冲田雅也
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Masaya Okita
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Bright Lab 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
    • G09G3/34—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
    • G09G3/04—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions
    • G09G3/16—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions by control of light from an independent source
    • G09G3/18—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of a single character by selection from a plurality of characters, or by composing the character by combination of individual elements, e.g. segments using a combination of such display devices for composing words, rows or the like, in a frame with fixed character positions 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
    • G09G2310/00—Command of the display device
    • G09G2310/06—Details of flat display driving waveforms
    • G09G2310/065—Waveforms comprising zero voltage phase or pause
    • 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
    • G09G3/3622—Control of matrices with row and column drivers using a passive matrix

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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)
  • Liquid Crystal Display Device Control (AREA)
  • Liquid Crystal (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Liquid Crystal Substances (AREA)

Abstract

本发明设法加快响应速度,在3色背光彩色显示或影像回放方面获得与用显像管的显示器同等以上性能。对于两电极夹着的向列相液晶与偏振片组合组成的液晶显示装置,使得两电极间电压按规定周期保持规定电压规定时间。

Description

向列相液晶驱动方法
本发明涉及一种液晶驱动方法，尤其涉及向列相液晶驱动方法。
已经知道，在具有透明电极的2张透明平板间夹着向列相液晶，置于2张偏振板之间，透过上述2张偏振板的光透射率便随上述2透明电极所加电压而变化。
运用该原理的液晶显示装置，其特点在于，厚度薄，电力消耗少，已广泛用于手表和台式电子计算机。
近些年，与彩色滤光片组合，用于笔记本型个人计算机或小型液晶电视等彩色显示的显示装置。
与彩色滤光片组合，能够进行彩色显示的液晶显示装置当中，红、绿、蓝3色像点组合进行彩色显示，但这种彩色滤光片非常昂贵，张贴面屏的作业也要求高精度。
此外，要获得与黑白液晶显示屏相同的分辨率，得需要3倍像点数，因而通常液晶显示屏中水平方向的驱动电路数目得3倍，不仅成本高，而且显示屏与驱动电路的接点数目也得3倍，连接作业也困难。
因而，作为用液晶显示屏进行彩色显示的方法，用彩色滤光片的方式，成本增加的因素较多，难以低廉地制造。而且，还有彩色滤光片的光透射率只有约20％，用彩色滤光片亮度变为约5分之一，背光电力消耗变得非常大这种缺点。
而且，现有的液晶显示装置，由于液晶响应速度慢，在进行电视等影像回放，或个人计算机等的鼠标高速活动等场合，与采用显像管的显示器相比，性能变差。
作为不用彩色滤光片的彩色液晶显示装置，如特开平1-179914提出过一种黑白液晶显示屏与3色背光组合进行彩色显示的方法，与彩色滤光片方式相比较，更有可能廉价地实现细致的彩色显示。但按现有的液晶驱动方法，向列相液晶的响应速度要花几十毫秒至几百毫秒。因而，用向列相液晶的液晶显示屏，被认为难以获得3色背光实现彩色所能达到的响应速度，即比8毫秒快的速度。
作为高速工作的液晶显示屏，提出过一种用强感应液晶或反强感应液晶的液晶显示屏，晶胞间隙需要形成低于1μm非常窄的间隙等，制造困难，难以实用化。
本发明所要解决的问题，是通过改变驱动方法，使以往所用的TN型或STN型向列相液晶响应速度加快，能够获得与基于上述3色背光的彩色化，或影像回放当中用显像管的显示器同等以上性能，也就是说，提供一种响应速度快的向列相液晶驱动方法。
正是要解决上述问题的本发明，其特征在于，通过按与现有液晶驱动电路不同的定时在液晶上加电压，使液晶响应速度加快。
本申请发明人，为了开发3色背光实现彩色所能达到的响应速度的液晶显示屏，对向列相液晶所加电压波形和光透射率的动态特性进行测定时，由所加电压波形发现，存在所加电压变化时光透射率高速变化的状态。
通过重复发生这种光透射率高速变化的状态，可以获得一种响应速度比现有驱动方法快得多、明亮且低功耗的彩色液晶显示屏。
图1示出的是本发明向列相液晶光透射率相对于所加电压变化的时间变化图。
图2示出的是现有技术向列相液晶光透射率相对于所加电压变化的时间变化图。
图1对本发明实施例向列相液晶显示屏示出所加电压波形及其绝对值、光透射率的变化。图2则对本发明实施例对应的现有技术向列相液晶显示屏示出所加电压波形及其绝对值、光透射率的变化。
图1和图2中的向列相液晶显示屏，是一种采用以往所用的TN型液晶或STN型液晶，使液晶材料和晶胞间隙为最佳，得到速度加快的显示屏。图1和图2中的液晶显示屏是就相同显示屏而言的。而且，图1和图2中T1至T6为相同时间，时间长度是小于上述3色背光方式彩色所需的液晶驱动周期，即小于8毫秒的时间。
如以往所知道的那样，液晶光透射率相对于所加电压的变化与所加电压的极性无关。但由于液晶一旦持续加上直流电压，便有液晶材料因电化学反应变差等问题，故而一般每隔一定时间便使所加电压极性反相。本发明实施例中，也进行极性反相，但对于本发明所要实现的液晶高速驱动来说，液晶动作速度随极性反相的进行没有较大变化。本发明液晶所加电压中，与极性无关的绝对值成为问题。以下通过对图1和图2的比较，说明本发明动作。
本发明实施例的驱动方法如图1所示，T1至T6各段时间中存在两种状态：所加电压绝对值根据图像数据为V1或0V期间，和所加电压绝对值按一定周期在一定时间内必定为0V期间。
图1中，T3和T5期间，所加电压绝对值一直为0V，光透射率也一直处于黑色状态。
图1中，T1、T2、T4和T6期间，所加电压绝对值起初为V1，光透射率变化为白色状态。所加电压绝对值接下来为0V，光透射率变化为黑色状态。因而，各段时间光透射率从黑色高速变为白色，然后再高速回到黑色。
现有驱动方法中，如图2所示，所加电压绝对值随所要显示的图像数据为V2和0V其中之一，但直到切换为下一图像数据这段时间所加电压绝对值一定。这种驱动方法中，TN液晶或STN液晶显示屏动作速度慢，例如，如图2中T2至T3那样，所加电压即便从V2变化为0V，光透射率在T3期间并不完全变为黑色。
比较图1和图2的话，为了使光透射率处于白色状态所加的电压，在现有驱动方法中如图2所示为V2，但本发明实施例中则如图1所示，可以加上比V2高的电压V1。所以，光透射率由黑色变为白色的时间，本发明实施例可以加快。此外，如本发明实施例那样，通过使所加电压绝对值按一定周期在一定时间内总是为0V，白色变为黑色的时间也可以加快。
本发明实施例中，如图1所示在各段时间内进行极性反相，以便T1至T6各段时间的平均电压大致为0V。这是因为，液晶高速动作，故每一段时间内使极性反相的话，便会由于所加正电压和所加负电压两者微小的绝对值差而产生闪烁的缘故。
本发明实施例是对不加电压状态下显示黑色的常黑液晶显示屏进行说明的，但对于通过改变按一定周期一定时间所加的电压，在不加电压状态下显示白色的常白液晶显示屏来说，也具有同样效果。而且，对于液晶所加电压与光透射率之间关系同通常液晶显示屏不同的特殊液晶显示屏来说，同样可以通过将按一定周期一定时间所加的电压设定为适当的值，来达到相同效果。
本发明实施例中，为了进行对比度高的显示，需要在一周期中液晶显示屏光透射率变化以后，光透射率回到原先的状态。
所以，本发明实施例中，缩短帧周期的话，光透射率便在完全回到原先状态之前过渡至下一周期。对比度便下降。而延长帧周期的话，便有发生闪烁等问题。
光透射率回到原先状态的时间，随液晶材料的特性，尤其是液晶材料的粘性等，有很大变化。
所以，通过选择光透射率回到原先状态的时间较短的液晶材料，便能够抑制闪烁发生，并进行对比度高的显示。
光透射率回到原先数值的时间是受到液晶材料粘性等很大的影响，因而通过升高液晶显示屏温度，即便不改变液晶材料，也能够进行对比度高的显示。
按照本发明，通过改变电压波形，液晶显示屏显示图像至该图像完全消隐能够在非常短的时间内进行，可获得非常高速的响应速度，属于影像回放的最佳方式。
按照本发明，与TFT方式所用的施加电压波形基本相同，可以用于TFT方式的液晶显示屏。此外，对于其他驱动方式，也可以通过使所加电压按一定周期在一定时间内为规定电压，来提高液晶动作速度。
此外，由于这样一种方式，即液晶显示屏显示图像至该图像完全消隐是在1帧时间内进行的方式，因而对于上述用3色背光的彩色显示方法来说，是最佳方法，可以实现高性能而且低价格的彩色显示器。

Claims (3)

1．一种向列相液晶驱动方法，对于向列相液晶，夹着所述液晶的两电极，以及所述电极夹着的液晶和偏振片组合的液晶显示装置，其特征在于，按规定周期使所述两电极间的电压保持规定电压规定时间。
2．如权利要求1所述的向列相液晶驱动方法，其特征在于，在所述规定周期内，使所述两电极间所加的电压极性反相，以便所述两电极间的平均电压大致为0。
3．如权利要求1或2所述的向列相液晶驱动方法，其特征在于，具有使向列相液晶温度升高至规定温度的加热手段。
CNB981095658A 1997-09-12 1998-06-05 向列相液晶驱动方法 Expired - Fee Related CN1161729C (zh)

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JP267819/97 1997-09-12
JP26781997A JPH1184341A (ja) 1997-09-12 1997-09-12 ネマティック液晶の駆動方法
JP267819/1997 1997-09-12

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JPH03132692A (ja) * 1989-10-18 1991-06-06 Matsushita Electric Ind Co Ltd 液晶表示装置の駆動方法及びその駆動回路
US5088806A (en) * 1990-01-16 1992-02-18 Honeywell, Inc. Apparatus and method for temperature compensation of liquid crystal matrix displays
JP2901438B2 (ja) * 1992-10-07 1999-06-07 シャープ株式会社 液晶表示装置の駆動方法
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CA2243383A1 (en) 1999-03-12
EP0903721A2 (en) 1999-03-24
JPH1184341A (ja) 1999-03-26
CA2243383C (en) 2012-12-18
CN1161729C (zh) 2004-08-11
KR100639602B1 (ko) 2006-12-19
TW421775B (en) 2001-02-11
HK1019106A1 (en) 2000-01-21
EP0903721A3 (en) 1999-07-21
KR19990029212A (ko) 1999-04-26

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