Abstract— A new conceptual ultra‐compact LCD panel, which features a simple interface and lower‐power consumption by using low‐temperature polysilicon thin‐film transistor (LTPS‐TFT) technology has been developed. This panel is capable of switching operation modes based on an input command, and all the data are directly communicated with the circuit inside the panel through a Serial Peripheral Interface (SPI) protocol. The integration of the serial‐data‐receiver function on glass substrate has enabled the achievement of a significant reduction in the number of interface pins. Moreover, a low power consumption of 15 μW for a 2.26‐in. reflective LCD panel in combination with the technique of integrating a memory circuit in each pixel has been achieved.
We have developed a new conceptual LCD with a memory circuit and a photo-sensor in each pixel. This LCD enables to display a still image in the low power consumption. In addition, direct writing and erasing a character in the LCD are available without calculating coordinates by using a light pen.
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.
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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