Patent Number: 6,396,464

Title: Liquid-crystal display control apparatus

Abstract: The liquid-crystal display control apparatus provided by the presentinvention comprises a display RAM unit 21 for storing character codes,character-generator RAM and ROM units 22 and 23 for storing character fontpatterns and a segment RAM unit 24 for storing picture patterns such asmarks and icons. When displaying a character, the following displaycontrol is carried out. First of all, a character code is read out fromthe display RAM unit 21 at a display address generated by adisplay-address counter 25. The character code is then used in conjunctionwith a raster address output by a line-address counter 26 for reading outa character font pattern from the character-generator RAM unit 22 or thecharacter-generator ROM unit 23. When displaying a picture pattern such asa mark or an icon, on the other hand, the following display control iscarried out. Display control information is read out from the segment RAMunit 24 at an address generated by the display-address counter 25.Dot-matrix characters and picture patterns such as marks and icons aredisplayed on the same screen on a time-division basis.

Inventors: Yokota; Yoshikazu (Kodaira, JP), Tsunekawa; Satoru (Higashimurayama, JP), Sugiyama; Kimihiko (Tachikawa, JP)


International Classification: G09G 3/18 (20060101); G09G 003/04 ()

Expiration Date: 05/28/2014