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Abstract

A video signal interface device that converts display data in serial format for a first display device, e.g. CRT display, to display data appropriate to a second display device, e.g. LCD panel. The second display device can execute binary display and carry out gray-scale display as a pseudo operation by switching with every frame. The interface comprises S/P converter means that converts the display data of serial format to parallel data, pattern generating means that holds gray-scale pattern data according to the number of gradations and outputs with every frame unit of the second display device data corresponding to the type of binary display in accordance with the gray-scale pattern data, memory means that stores display for the second display device, data generating means that generates display data of parallel format based on both the output of the pattern generating means and the displayed gradations of the converted display data, memory control means that writes data generated by the data generating means to the memory means and that reads the data from the memory means, address generating means that generates addresses for the memory means, and output means that outputs data read from the memory means at timing matched with the operation of the second display device.

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First Claim