Pixel driving circuit for blue phase liquid crystal display device

一种用于蓝相液晶显示装置的像素驱动电路

Abstract

本发明提供一种用于蓝相液晶显示装置的像素驱动电路,包括:第一开关,其控制端接收第一控制信号且第二端接收第一数据信号;第二开关,其控制端接收第一控制信号且第二端接收第二数据信号;第三开关,其控制端经由第一电容耦接至第一时钟信号;第四开关,其控制端经由第二电容电性耦接至第二时钟信号;第五开关,其第一端耦接至第一预设电压。相比于现有技术,本发明利用模拟式的数据电压搭配阶跃型的斜坡时钟信号进行像素电压的写入或决定像素开启的时间,实现像素灰阶的切换,该驱动方式因需要一段预充电时间从而能够克服蓝相液晶的等效电容在维持期间与扫描期间变异剧烈所导致的充电不足问题。
The invention provides a pixel driving circuit for a blue phase liquid crystal display device. The pixel driving circuit comprises a first switch, a second switch, a third switch, a fourth switch and a fifth switch, wherein a control terminal of the first switch receives a first control signal, and a second terminal receives a first data signal; a control terminal of the second switch receives the first control signal, and a second terminal receives a second data signal; a control terminal of the third switch is coupled to a first clock signal through a first capacitor; a control terminal of the fourth switch is electrically coupled to a second clock signal rough a second capacitor; a first end of the fifth switch is coupled to first preset voltage. Compared with the prior art, the pixel driving circuit adopts analog data voltage to be matched with a step-index type slope clock signal for write-in of pixel voltage or determination of pixel opening time, pixel gray-to-gray is realized, and the driving mode requires a period of time for pre-charging, so that the problem of insufficient charging caused by severe variation of equivalent capacitance of a blue phase liquid crystal in a maintaining period and a scanning period can be solved.

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