Color lcd display control system

Details Color lcd display control system Color lcd display control system

G - Physics

09

G

G09G 3/36 (2006.01) G06F 3/147 (2006.01)

Patent

CA 2041819

A value obtained by adding a back porch period fol- lowing a vertical sync signal output from a CRT control- ler to the total number of horizontal display lines of a display resolution is set in a register. A counter counts the value set in the register in synchronism with a horizontal sync signal, and outputs a scanning start signal to a Y driver. With this operation, when a des- ignated display resolution is lower than the physical resolution of an LCD, the scanning start signal is out- put before scanning of all the physical display lines of the LCD is completed. As a result, upper and lower non- display portions on the LCD display screen are simulta- neously scanned.

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