Seiko Epson Corporation

Seiko Epson Corporaiton

Yohichi Imamura

Shigeki Aoki

Norio Koizumi

The present invention provides a matrix type display device which simplifies the process in a display signal generating circuit while relieving the load on an external CPU, and which arranges freely character and icon display areas while preventing the quality of display from being degraded by the shadow phenomenon and others. A display code memory stores character display codes and icon display codes for one image at a desired address arrangement. A pattern generating circuit transfers image patterns for the display codes to a display signal transferring circuit through a multiplexer. A decoder selecting device is responsive to a decoder select signal to select a decoder, thereby controlling voluntarily the timing of latch signal generation. Display signal input in the time division manner is latched in first and second latch circuits through the latch signal. Thereafter, the display signal is transferred to a signal electrode driving circuit through a line memory to display an image on a matrix panel.

Matrix type display device, electronic system including the same and

The present invention provides a matrix type display device which simplifies the process in a display signal generating circuit while relieving the load on an external CPU, which arranges freely character and icon display areas while preventing the quality of display from being degraded by the shadow phenomenon and others. A display code memory stores character display codes and icon display codes for one image at a desired address arrangement. A pattern generating circuit transfers image patterns for the display codes to a display signal transferring circuit through a multiplexer. A decoder selecting device is responsive to a decoder select signal to select a decoder, thereby controlling voluntarily the timing of latch signal generation. Display signal input in the time division manner is latched in first and second latch circuits through the latch signal. Thereafter, the display signal is transferred to a signal electrode driving circuit through a line memory to display an image on a matrix panel.

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Suwa, Japan

Yohichi Imamura