Patent ID: 6259421
Filing Date: 2001-07-10
Classification: G09G

Abstract:
A liquid-crystal display system comprising:a liquid-crystal display unit having:first common lines;a second common line; andsegment lines arranged to cross said first common lines and said second common line;wherein first portions where the segment lines and the first common lines are overlapped have dots to be used for displaying character font patterns; andwherein second portions where the segment lines and the second common line are overlapped have predetermined picture patterns; anda liquid-crystal display controller formed on a semiconductor chip and including:a common line driver circuit cyclically driving the first common lines and the second common line;a first memory storing character codes to be displayed on the liquid-crystal display unit;a character memory coupled to the first memory and storing character font pattern information corresponding to the character codes stored in the first memory, the character memory being responsive to reception of a predetermined character code from said first memory and outputting predetermined character font pattern information corresponding to the predetermined character code;a second memory storing segment control information representing whether or not each of the predetermined picture patterns in the liquid-crystal display unit is displayed on the liquid-crystal display unit;a segment line driver, coupled to the character memory and the second memory, driving the segment lines in accordance with one of the segment control information from the segment memory and character font information from the character memory; andan address providing circuit providing a display address to said first memory in synchronism with the driving of said first common lines while said display address is provided to said second memory in synchronism with the driving of said second common line.