Pixel circuit of smectic state liquid crystal multistable electronic paper display

Abstract

The invention discloses a pixel circuit of a smectic state liquid crystal multistable electronic paper display. For an MxN dot matrix display, the pixel circuit corresponding to an ith line and a jth row comprises transistors T1ij and T2ij, an oscillator OSCij, charge pumps CBij and CB2ij and a pixel CPij; a drive signal comprises a grid control voltage VGi, and source end driving voltages VS1j and VS2j, grid electrodes of the transistors T1ij and T2ij of the ith row are connected with the grid control voltage VGi, the source electrode of the transistor T1ij of the jth line is connected with the source end driving voltage VS1j, and the source electrode of the transistor of the jth line is connected with the source end driving voltage VS2j; the drain electrode of the transistor T1ij is connected with the input end of the charge pump CB1ij, and the drain electrode of the transistor T2ij is connected with the input end of the charge pump CB2ij; the charge pump CB1ij and the charge pump CB2ij are connected with oscillator oscillation signals phi1ij and phi2ij of the oscillator OSCij; the oscillator OSCij is powered by the grid control voltage VGi; and the output ends of the charge pump CB1ij and the charge pump CB2ij are respectively connected with two counter electrodes of the pixel CPij. According to the pixel circuit of the smectic state liquid crystal multistable electronic paper display, energy consumption can be reduced, and more accurate control is realized.

Description

technical field [0001] The invention relates to a pixel circuit of an electronic paper display (Electronic Paper Displayer-EPD), in particular to a pixel circuit of a smectic liquid crystal multi-stable electronic paper display. Background technique [0002] At present, various forms of reflective electronic paper displays are developing very rapidly. Compared with the transmissive traditional liquid crystal display (LCD), the electronic paper display has a good ability to adapt to ambient light and is suitable for reading; the backlight source of the transmissive display needs to pass through each structural layer of the display, and the transmittance is generally 20. % or less, the light source utilization efficiency is low, and the electronic paper display uses ambient light source or reflective lighting source, and the utilization rate of the light source is high; the image of the electronic paper display does not need to be powered on to maintain, and the display materi...

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Problems solved by technology

[0007] Passive matrix displays have certain advantages, but they also have many disadvantages. Therefore, it is necessary to design an active matrix-based, low-voltage power supply-driven, smectic liquid crystal electronic paper display, which can play the advantages of smectic liquid crystal electronic paper displays. While overcoming the shortcomings of existing implementations

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