Patent ID: 6850246
Filing Date: 2005-02-01
Classification: G09G

Abstract:
1. A screen display unit comprising: a display information memory to which a central processing unit writes first selection information corresponding to character information, and display color information corresponding to the character information; a first font data memory that stores font information and display color information corresponding to the character information in advance, and reads display color information representing individual dots constituting font information corresponding to the character information read from said display information memory; a second font data memory that stores font information corresponding to the character information in advance, and reads font information corresponding to the character information read from said display information memory; a composition circuit for combining the font information read from said second font data memory with the display color information read from said display information memory to output display color information on a font information by font information basis; a first selector for selecting one of the display color information output from said first font data memory and the display color information output from said composition circuit, in response to second selection information supplied from said central processing unit; a plurality of RGB allocation information memories that store different RGB allocation information corresponding to the display color information in advance, and read RGB allocation information corresponding to the display color information selected by said first selector; a second selector for selecting, in response to the second selection information fed from said central processing unit, one of the first selection information that is read from said display information memory and third selection information that is fed from said central processing unit; a third selector for selecting the RGB allocation information read from said plurality of RGB allocation information memories on a character information by character information basis when said second selector selects the first selection information, and for selecting the RGB allocation information read from said plurality of RGB allocation information memories on a screen by screen basis when said second selector selects the third selection information; and a timing signal generator for generating timing signals supplied to said display information memory, said first and second font data memories, said composition circuit, said first to third selectors, and said plurality of RGB allocation information memories.