CN1892782A - 可移动液晶显示器及其驱动方法 - Google Patents

可移动液晶显示器及其驱动方法 Download PDF

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CN1892782A
CN1892782A CNA2006100830239A CN200610083023A CN1892782A CN 1892782 A CN1892782 A CN 1892782A CN A2006100830239 A CNA2006100830239 A CN A2006100830239A CN 200610083023 A CN200610083023 A CN 200610083023A CN 1892782 A CN1892782 A CN 1892782A
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liquid crystal
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output buffer
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赵性浒
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LG Display Co Ltd
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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
    • 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
    • G09G3/3685Details of drivers for data electrodes
    • G09G3/3688Details of drivers for data electrodes suitable for active matrices only
    • 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
    • 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
    • G09G3/3648Control of matrices with row and column drivers using an active matrix
    • G09G3/3655Details of drivers for counter electrodes, e.g. common electrodes for pixel capacitors or supplementary storage capacitors
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264Details of driving circuits
    • G09G2310/027Details of drivers for data electrodes, the drivers handling digital grey scale data, e.g. use of D/A converters
    • GPHYSICS
    • G09EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09GARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G2310/00Command of the display device
    • G09G2310/02Addressing, scanning or driving the display screen or processing steps related thereto
    • G09G2310/0264Details of driving circuits
    • G09G2310/0291Details of output amplifiers or buffers arranged for use in a driving circuit
    • 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
    • G09G2330/021Power management, e.g. power saving
    • 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
    • G09G3/3614Control of polarity reversal in general

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Abstract

一种液晶显示器件,具有连接到液晶显示板的公共电极和数据线至少之一的输出缓冲器,以及通过划分为开周期和关周期来驱动输出缓冲器的电源开关。

Description

可移动液晶显示器及其驱动方法
本发明要求于2005年6月30日在韩国提交的韩国专利申请No.P2005-0058126的优先权,该申请在此结合作为参考。
技术领域
本发明涉及一种液晶显示器件,更具体地,涉及一种减小功耗的可移动液晶显示器件及其驱动方法。
背景技术
液晶显示器件通过使用电场控制具有介电各向异性的液晶的光透射率来显示图像。为此,液晶显示器件包括具有像素矩阵的液晶显示板和用于驱动该液晶显示板的驱动电路。明确地,如图1所示的液晶显示器件包括:具有像素矩阵的液晶显示板10;用于驱动液晶显示板10的栅线GL的栅驱动器12;用于驱动液晶显示板10的数据线DL的数据驱动器14;和用于控制栅驱动器12和数据驱动器14的时序控制器16。
液晶显示板10包括由在栅线GL和数据线DL的每个交叉处形成的像素构成的像素矩阵。每个像素包括根据数据信号控制光透射率的液晶盒Clc,和用于驱动液晶盒Clc的薄膜晶体管TFT。薄膜晶体管TFT响应栅线GL的扫描信号接收并在液晶盒Clc中保持来自数据线DL的数据信号。液晶盒Clc根据数据信号改变液晶的排列状态以控制光透射率,由此实现灰度级。
栅驱动器12响应来自时序控制器16的控制信号将扫描信号顺序提供给栅线GL。数据驱动器14将来自时序控制器16的数字数据信号转换为模拟数据信号以提供给数据线DL。时序控制器16将控制信号提供给栅驱动器12和数据驱动器14并将数字数据提供给数据驱动器14。
具有上述特征的小的液晶显示器件主要用于可移动应用。然而,对于这种应用必须减小功耗。为此,如图2所示,液晶显示器件使用对于每条水平线反转液晶盒的极性的行反转方法。
如图3所示,当栅线由栅信号Vgate驱动时,行反转方法对于每个水平同步周期1H反转公共电压Vcom的极性,由此能够减小数据电压Vdata。然而,甚至使用行反转方法,由于公共电压Vcom的频率,功耗也相对较高。从而,需要可以减小功耗的方法。
发明内容
因此,本发明涉及一种可移动液晶显示器件及其驱动方法,其基本上避免了由于现有技术的限制和缺陷引起的一个或多个问题。
本发明的一个目的是提供一种适于减小功耗的可移动液晶显示器件及其驱动方法。
本发明另外的特征和优点将在下面的描述中提出,从描述中部分显而易见,或者可以从本发明的实施中了解。通过以下的描述及其权利要求以及所附附图中所指出的具体结构,可以实现和得到本发明的目的和其它优点。
为了实现这些目的和其他优点并根据本发明的目的,如这里具体和广义描述的,一种可移动液晶显示器件包括连接到液晶显示板的公共电极和数据线至少之一的输出缓冲器,和用于驱动输出缓冲器进入开周期和关周期的电源开关部分。
根据另一方面,一种液晶显示器件的驱动方法包括以下步骤:在第一周期中通过驱动连接到液晶显示板的公共电极和数据线至少之一的输出缓冲器来提供输出信号,以及在第二周期中关闭输出缓冲器。
应当理解,本发明之前的概括描述和下面的详细描述为示例性的和解释性的,并且意欲提供对本发明的进一步解释。
附图说明
结合在本发明中的所附附图用于提供对本发明的进一步理解,构成本申请的一部分,这些附图说明了本发明的实施例,并与说明书一起用于解释本发明的原理。在附图中:
图1所示为现有技术的液晶显示器件的框图;
图2所示为在现有技术的行反转方法中驱动的液晶盒极性的图;
图3所示为线反转驱动期间现有技术的栅线和公共电极的驱动波形图;
图4所示为根据本发明示例性实施方式的液晶显示器件的公共电压产生器和数据驱动器的电路图;以及
图5所示为图4所示的公共电压产生器和数据驱动器的示例性驱动波形图。
具体实施方式
现在将对本发明的优选实施方式进行详细描述,在所附附图中示出了这些
实施方式。
图4所示为在根据本发明示例性实施方式在液晶显示器件中驱动电路(未示出)的数据驱动器20和公共电压产生器40。图5所示为图4所示的驱动电路的示例性驱动的波形图。
如图4所示,数据驱动器20将数据信号Vdata提供给液晶显示板的数据线,以及公共电压产生器40将高公共电压Vcom提供给液晶显示板的公共电极。数据驱动器20根据来自外部的供给信号和控制信号将数字数据转换为模拟数据信号,并将转换后的模拟数据信号提供给液晶显示板的数据线。为此,数据驱动器20包括逻辑电路部分22、数字模拟转换器(以下称为“DAC”)24、和输出缓冲器部分26。
逻辑电路部分22将从外部输入的数字数据顺序采样到锁存器(未示出),并将锁存后的数字数据提供给DAC 24。DAC 24利用伽玛电压将从逻辑电路部分22接收的数字数据转换为模拟数据信号,并将转换后的模拟数据信号提供给输出缓冲器部分26。
输出缓冲器部分26缓冲来自DAC 24的模拟数据信号并将缓冲后的模拟数据信号提供给液晶显示板的数据线。具体地,在输出缓冲器部分26中包括的多个输出缓冲器28的每一个连接到数据线。输出缓冲器28利用流过连接到第一高电势电压VDD1线的第一开关SW1的充电电流和流过连接到第一低电势电压VSS1线的第二开关SW2的放电电流在数据线中充入数据信号Vdata,使其接近于来自DAC 24的输入信号。输出缓冲器部分26进一步包括连接在接地电压GND线和输出缓冲器28的输出线之间的第三开关SW3。
输出缓冲器部分26利用第一和第二开关SW1和SW2将一个水平周期1H划分为输出缓冲器28的开周期和关周期。当输出缓冲器28通过第一和第二开关SW1和SW2接通时,输出缓冲器部分26利用充电和放电电流缓冲数据线中的数据信号Vdata。当数据信号Vdata被缓冲时,输出缓冲器部分26通过第一和第二开关SW1和SW2关闭输出缓冲器28。同时,第三开关SW3接通以使数据线接地。因此,输出缓冲器28的电流消耗降低,如图5所示,线反转数据信号Vdata的摆动宽度减小。从而,功耗减小。
如图5所示,开关SW1,SW2和SW3受栅使能信号GOE控制,该栅使能信号确定在栅驱动器中提供扫描信号SP的周期。通常,可移动液晶显示器件具有低分辨率以至于约100□的一个水平同步周期1H是足够的。从而,如图5所示,数据信号Vdata可以在输出缓冲器28的开周期中被缓冲。
如图4所示,公共电压产生器40包括用于产生高公共电压VcomH的第一公共电压产生器42、用于产生低公共电压VcomL的第二公共电压产生器44,和输出缓冲器部分45,其交替地缓冲由第一和第二公共电压产生器42和44提供给液晶显示板的公共电极的高公共电压VcomH和低公共电压VcomL
输出缓冲器部分45包括分别连接到第一和第二公共电压产生器42和44的输出线的第一和第二输出缓冲器46和48。输出缓冲器部分45进一步包括用于切换第一和第二输出缓冲器46和48的输出的第三开关SW3和用于使公共电极接地的第四开关SW4。
第一输出缓冲器46利用流过连接到第二高电势电压VDD2线的第一开关SW1的充电电流和流过连接到第二低电势电压VSS2线的第二开关SW2的放电电流在公共电极中充入公共电压Vcom,使其接近于高公共电压VcomH。第二高电势电压VDD2可以等于或不等于第一高电势电压VDD1。类似地,第二低电势电压VSS2可以等于或不等于第一低电势电压VSS1。第二输出缓冲器48利用从第二高电势电压VDD2线流过第一开关SW1的充电电流和从第二低电势电压VSS2线流到第二开关SW2的放电电流在公共电极中充入公共电压Vcom,使其接近于低公共电压VcomL。第三开关SW3响应用于线反转的极性控制信号将第一输出缓冲器46的高公共电压VcomH和第二输出缓冲器48的低公共电压VcomL交替地提供给公共电极。
如图5所示,输出缓冲器部分45通过第一和第二开关SW1和SW2将一个水平周期1H划分为第一和第二输出缓冲器46和48的开周期和关周期。当第一和第二输出缓冲器46和48通过第一和第二开关SW1和SW2接通时,输出缓冲器部分45利用充电和放电电流通过第三开关SW3缓冲公共电极中的相应公共电压Vcom。如对于数据驱动器20所述,第一和第二开关SW1和SW2受栅使能信号GOE控制。当公共电压Vcom被缓冲时,输出缓冲器部分45通过第一和第二开关SW1和SW2关闭输出缓冲器28。同时,第四开关SW4接通以使公共电极接地。因此,第一和第二输出缓冲器46和48的电流消耗降低,如图5所示,行反转公共电压Vcom的摆动宽度减小,由此减小功耗。
在通过两条线或更多的反转方法驱动数据线和公共电极的情况下,其中水平同步周期的关周期具有与下一个水平同步周期相同的极性,仅公共电压产生器40的第一和第二输出缓冲器46和48和数据驱动器20的输出缓冲器28通过第一和第二开关SW1和SW2关闭,以使数据线和公共电极浮动。在该时间期间,数据驱动器20的第三开关SW3和公共电压产生器40的第四开关SW4断开。
在水平同步周期的关周期中,其中极性与下一个水平同步周期的极性相反,输出缓冲器28,46和48都通过第一和第二开关SW1和SW2关闭,并且数据驱动器20的第三开关SW3和公共电压产生器40的第四开关SW4接通以使数据线和公共电极接地。因此,甚至在两条线或更多的反转方法中,对于每两条线或更多反转的公共电压Vcom和数据信号Vdata的摆动宽度减小以减小功耗。
如上所述,根据本发明示例性实施方式的可移动液晶显示器件及其驱动方法将一个水平同步周期划分为输出缓冲器的开周期和关周期。数据信号和公共电压仅在输出缓冲器的开周期中输出,数据线和公共电极在关周期中接地。因此,输出缓冲的电流消耗以及公共电压和数据信号的摆动宽度减小,由此减小功耗。
此外,在水平同步周期中具有与下一个水平同步周期相同极性的输出缓冲器关周期期间,根据本发明示例性实施方式的可移动液晶显示器件及其驱动方法使数据线和公共电极浮动。在水平同步周期中具有与下一个水平同步周期不同极性的输出缓冲器关周期期间,数据线和公共电极接地。因此,即使在两条线或更多的反转方法中,公共电压和数据信号的摆动宽度和输出缓冲器的电流消耗减小,由此减小功耗。
对于本领域技术人员显而易见的是在不偏离本发明的精神或范围的情况下可以得到本发明的可移动液晶显示器件及其驱动方法的多种变形和变化。从而,本发明意欲覆盖这些变形和变化,只要它们在所附权利要求及其等同物的范围内。

Claims (14)

1、一种液晶显示器件,包括:
输出缓冲器,连接到液晶显示板的公共电极和数据线至少之一;以及
电源开关部分,用于驱动所述输出缓冲器进入开周期和关周期。
2、根据权利要求1所述的液晶显示器件,其特征在于,还包括接地开关,用于使所述输出缓冲器的输出线接地。
3、根据权利要求2所述的液晶显示器件,其特征在于,所述电源开关部分将一个水平同步周期划分为所述输出缓冲器提供输出信号的开周期和所述输出缓冲器关闭时的关周期。
4、根据权利要求3所述的液晶显示器件,其特征在于,所述接地开关在所述关周期中使所述输出缓冲器的输出线接地。
5、根据权利要求4所述的液晶显示器件,其特征在于,所述电源开关部分和接地开关受栅使能信号控制,所述栅使能信号确定扫描脉冲提供给所述液晶显示板的栅线的周期。
6、根据权利要求3所述的液晶显示器件,其特征在于,所述接地开关在提供具有与下一个水平同步周期相反极性的输出信号时的所述水平同步周期的关周期中使所述输出线接地。
7、根据权利要求3所述的液晶显示器件,其特征在于,所述接地开关在提供具有与下一个水平同步周期相同极性的输出信号时的所述水平同步周期的关周期中使所述输出线浮动。
8、根据权利要求1所述的液晶显示器件,其特征在于,所述电源开关部分包括:
连接到高电势驱动电压线的第一电源开关;以及
连接到低电势驱动电压线的第二电源开关。
9、一种液晶显示器件的驱动方法,包括以下步骤:
在第一周期中通过驱动连接到液晶显示板中公共电极和数据线至少之一的输出缓冲器来提供输出信号;以及
在第二周期中关闭所述输出缓冲器。
10、根据权利要求9所述的驱动方法,其特征在于,还包括在所述第二周期中使所述输出缓冲器的输出线接地的步骤。
11、根据权利要求9所述的驱动方法,其特征在于,一个水平同步周期被划分为所述第一周期和所述第二周期。
12、根据权利要求9所述的驱动方法,其特征在于,所述第一和第二周期通过栅使能信号划分,所述栅使能信号确定扫描脉冲提供给液晶显示板的栅线的周期。
13、根据权利要求9所述的驱动方法,其特征在于,所述输出线仅在提供极性与下一个水平同步周期极性相反的输出信号时的水平同步周期的第二周期中接地。
14、根据权利要求9所述的驱动方法,其特征在于,所述输出线仅在提供极性与下一个水平同步周期极性相同的输出信号时的水平同步周期的第二周期中浮动。
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