Method for Mapping Medium Resolution Graphic of Four Colors on a Two Color Liquid Crystal Display
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09
Medium resolution graphic mode contains a maximum of 200 rows of 320 pels (picture elements) each, where each pel is 1 wide by 1 high. Each byte in display storage defines 4 pels as shown below: (Image Omitted) Although a Liquid Crystal Display only has black and grey as its colors, graphics can be displayed as follows: A 640x200 LCD is twice as wide as is used in medium resolution graphics. Since 2 bits defined each graphics pel and each row was 320 pels wide, this graphics data can be sent directly to the LCD to fill its 640-pel-wide rows. Therefore, what was a 1 wide, 1 high pel on a color monitor is mapped to a 2 wide, 1 high pel on the LCD. The LCD pel definition and mapping is described below: (Image Omitted) The 4 "colors" are created by the 4 different C1/C0 combinations.