Sharp Kabushiki Kaisha Corporation

Semiconductor Energy Laboratory Co., Ltd.

Yasuhiro Hirayama

Jun Koyama

Buyeol Lee

Yutaka Shionoiri

Hajime Kimura

Hiroyuki Miyake

Yasushi Kubota

Shinji Horino

Takaaki Uno

Yukihiro Mizumoto

A liquid crystal display device having analog buffer circuits, which is reduced in luminance fluctuation is provided. A source signal line driver circuit has a plurality of analog buffer circuits, the plurality of source signal lines and the plurality of analog buffer circuits constitute a circuit group, and source signal lines connected to the analog buffer circuits are switched their connections to different analog buffer circuits each time a new period is started. Therefore, output fluctuation among the analog buffer circuits is averaged and a uniform image can be displayed on the screen.

Liquid crystal display device and method of driving a liquid crystal display device

A liquid crystal display device having analog buffer circuits is provided which is reduced in luminance fluctuation. A source signal line driving circuit has a plurality of analog buffer circuits. Source signal lines connected to the analog buffer circuits are switched their connections to different analog buffer circuits each time a new period is started. Output fluctuation among the analog buffer circuits is thus averaged and a uniform image can be displayed on the screen.

An AC driven active matrix display device in which image display with enough brightness can be easily achieved while reducing an amplitude range of a pixel electrode potential. The display deviceoraccording to the invention comprises two memory circuits (a first memory circuitand a second memory circuit) which are connected in series between each pixel electrodeand a corresponding signal line. Data is written to the first memory circuit in a first period, then the data is transferred from the first memory circuit to the corresponding second memory circuit in a second period. The potential of a counter electrodeis switched in the second period between a first potential (VcomH) and a second potential (VcomL).

Active matrix display device and driving method of the same

A liquid crystal display system of the present invention includes: an operation processing apparatus having a digital-analog converter converting a digital video signal to an analog video signal based on predetermined time information and a synchronization combining circuit superimposing the predetermined time information on at least one of a horizontal synchronizing signal and a vertical synchronizing signal; and a liquid crystal display apparatus converting the analog video signal to a digital video signal based on the predetermined time information, thereby displaying an image based on the converted digital video signal.

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Osaka, Japan

Yasuhiro Hirayama