Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Electric Corporation

Hidehiko Nakatani

Kazuhiro Sugiyama

Masahiro Naito

Naoto Sugawara

In the case where graphic data GDneeding a high-speed rendering are to be written in a frame memory () from an image writing unit (), the graphic data GDare written in the frame memory () in accordance with an instruction from the image writing unit () irrespective of the read state of graphic data GDto be read from the frame memory (). In the case of the graphic data GDneeding an ordinary speed, on the other hand, a write wait signal WT is outputted from a data write control unit () to the image writing unit () for the period till the read of the graphic data GDfrom the frame memory () ends. For the period while the write wait signal WT is being outputted, the write of the graphic data GDfrom the graphic data writing unit () is made to wait.

Matrix type display device and display method thereof

A matrix-type display device has a matrix display panel, a frame memory, and a graphics memory. Input image data are temporarily buffered in the graphics memory, then transferred to the frame memory and read out to drive the matrix display panel. Readout from the frame memory is cyclic, and is synchronized with a frame synchronization signal. A synchronizing circuit also synchronizes the transfer of data from the graphics memory to the frame memory with the frame synchronization signal, so that each displayed frame is generated from a single frame of image data, and not from parts of two different frames. Moving images can therefore be reproduced faithfully. This matrix-type display device is useful in mobile information-terminal equipment, such as mobile telephone sets.

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Tokyo, Japan

Hidehiko Nakatani