28.1: <i>Distinguished Paper</i>: A Novel Low‐Power‐Consumption All‐Digital System‐On‐Glass Display with Serial Interface

We have developed a new conceptual liquid crystal display (LCD) with a memory circuit and a photosensor in each pixel to realize excellent handwriting performance. Direct writing and erasing a character in the LCD are available because their direct processing only in the pixel are performed without calculating coordinates by using a light pen and integrated pixel circuits. In addition, this LCD enables to display still image data stored in the pixel memory circuit at a low liquid crystal (LC) driving frequency of 1.0 Hz. In the result, we have achieved faster handwriting response time of 0.5 ms and lower power consumption of 0.7 mW in 7.0‐in. QVGA reflective LCD panel.

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A memory‐in‐pixel reflective‐type LCD using newly designed system and pixel structure

Tamaki

Fukunaga

Mitsui

et al. 2014

J Soc Info Display

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-A 7.03-in. extended graphics array reflective LCD prototype has been developed by using memory-in-pixel (MIP) technologies with a newly designed system and pixel structure. The MIP system comprising a MIP backplane and a display driver has been optimized to reduce power consumption. The MIP backplane has specific circuits that allow accessing row drivers randomly, and the display driver manages which row should be accessed. Thus, the system is capable of showing a mixture of still and moving images, resulting in low power consumption. A dithering block embedded in the display driver enables to select an appropriate dithering algorithm according to the types of images and the position on the screen. In addition, the novel pixel structure, "three divided patterns", has been designed to improve image quality and to provide visibility in dark environments. The latter is based on a novel approach; interpixel area is used for an aperture to transmit light from the backlight, and the fringe field from adjacent pixel electrodes is used to control LC directions. The feature of the pixel structure is also effective for obtaining equivalent gamma between reflective and transmissive images.

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28.1: Distinguished Paper: A Novel Low‐Power‐Consumption All‐Digital System‐On‐Glass Display with Serial Interface

Abstract: We have developed a low‐power LCD panel with a serial interface by combining the technique of integration of serial data receiver function and pixel memory circuits. It has achieved a low power consumption of 15uW in a 2.26‐inch format.

Cited by 10 publications

References 4 publications

Reflective LCD with Memory in Pixel Structure

Reflective LCD with Memory in Pixel Structure

Novel write‐erasable input display with memory circuits and photosensors

A memory‐in‐pixel reflective‐type LCD using newly designed system and pixel structure

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