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    • 6. 发明授权
    • Method and apparatus for driving a liquid crystal display panel
    • 用于驱动液晶显示面板的方法和装置
    • US5307084A
    • 1994-04-26
    • US863379
    • 1992-04-03
    • Hisashi YamaguchiYoshiya KanekoMunehiro HaraguchiHiroshi MurakamiTakayuki HoshiyaTetsuya KobayashiKazuhiro Takahara
    • Hisashi YamaguchiYoshiya KanekoMunehiro HaraguchiHiroshi MurakamiTakayuki HoshiyaTetsuya KobayashiKazuhiro Takahara
    • G09G3/36
    • G09G3/3696G09G3/3622G09G2320/0209
    • In a driver circuit of direct drive matrix type LCD panel, a quantity of ON-STATE cells (or OFF-STATE cells) displayed on the just previous scan electrode is counted and a quantity of ON-STATE cells (or OFF-STATE cells) to be displayed on a present scan electrode is also counted. A compensation voltage is generated according to a predetermined relation based on a difference of the two above-counted quantities, and is superposed onto drive voltages of unselected scan electrodes or of each of data electrodes, in a polarity that an undesirable spike voltage induced on unselected cell voltage is cancelled, in synchronization with selection of the present scan electrode. The compensation voltage may be generated according to a digital difference of the two quantities or to a change in an analog voltage representing the counted quantity. The above-described relation of the compensation voltage versus the counted quantity difference may be proportional or may be given with a predetermined specific relation to meet the panel characteristics. The compensation voltage may be a flat voltage during the period for selecting the single scan electrode or may be of a spike waveform. Amplitude of this spike is determined by the above-described predetermined relation. An irregular panel brightness caused from spike voltages induced from data electrode voltage application is cancelled.
    • 在直接驱动矩阵型LCD面板的驱动电路中,对刚刚扫描电极上显示的一定数量的ON状态单元(或OFF状态单元)进行计数,并将ON状态单元(或OFF-STATE单元) 也显示在当前扫描电极上。 基于两个上述计数量的差异,根据预定关系产生补偿电压,并以非选择的扫描电极或每个数据电极的驱动电压叠加在非选择的不期望的尖峰电压的极性 与当前扫描电极的选择同步地消除电池电压。 补偿电压可以根据两个数量的数字差或与表示计数量的模拟电压的变化产生。 补偿电压与计数量差的上述关系可以是成比例的或者可以以预定的特定关系给出以满足面板特性。 在用于选择单个扫描电极的周期期间,补偿电压可以是平坦的电压,或者可以是尖峰波形。 该尖峰的幅度由上述预定关系决定。 由数据电极电压施加引起的尖峰电压导致的不规则面板亮度被取消。
    • 10. 发明申请
    • Active Matrix Type Display Device
    • 有源矩阵型显示设备
    • US20080143648A1
    • 2008-06-19
    • US11587905
    • 2004-04-30
    • Atsuo IshizukaHisashi YamaguchiYasunobu Hashimoto
    • Atsuo IshizukaHisashi YamaguchiYasunobu Hashimoto
    • G09G3/30
    • G09G3/325G09G2300/0842G09G2300/0861G09G2310/0251G09G2320/0233
    • The display device of the invention comprises a plurality of scanning lines (Wscan and Escan) which are selected successively, a plurality of data lines (Data) to which the writing electric current (Idata) in accordance with brightness information is supplied according to the scanning line selection, and a plurality of pixels (PX) arranged at intersecting points between the scanning lines and the data lines. Each of the pixels comprises a light emitting element (OLED), a driving transistor (TFT4), a capacitor (C) connected to the gate (Nd) of the driving transistor for accumulating writing data, a first transistor (TFT1) which is turned on during writing period in which the scanning lines are scanned and which connects the data lines and the drain of the driving transistor, and a second transistor (TFT2) which is turned on during the writing period and which short-circuits the gate and drain of the driving transistor. With such a structure, the light emitting element can be driven with a driving electric current equivalent to the writing electric current, irrespective of variations in characteristics of the transistors,
    • 本发明的显示装置包括连续选择的多条扫描线(Wscan和Escan),根据扫描提供根据亮度信息提供写入电流(Idata)的多条数据线(Data) 线选择,以及布置在扫描线和数据线之间的交叉点处的多个像素(PX)。 每个像素包括发光元件(OLED),驱动晶体管(TFT4),连接到用于积累写入数据的驱动晶体管的栅极(Nd))的电容器(C),第一晶体管(TFT 1) 在扫描线被扫描并连接驱动晶体管的数据线和漏极的写入周期期间导通,以及在写入周期期间导通的第二晶体管(TFT 2),并且使栅极短路 和驱动晶体管的漏极。 利用这种结构,可以用与写入电流相当的驱动电流来驱动发光元件,而与晶体管的特性的变化无关,