Browse Prior Art Database

Color on Color Character Attribute Mapping Implementation for a Liquid Crystal Display Disclosure Number: IPCOM000061311D
Original Publication Date: 1986-Jul-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue


Related People

Arismendi, AA Day, MN Hanna, JT Hunt, GT [+details]


A method is described to permit application programs utilizing the Personal Computer Color Graphics Adapter in the alphanumeric mode to display their text on a liquid crystal display for program transportability. The attribute byte of a given character defines its background and foreground colors. The bit positions are defined below (R is red, G is green, B is Blue, and IN is Intensify): (Image Omitted) A liquid crystal display (LCD) is limited to 2 colors: grey and black. In order to display color characters, mapping the attribute to allow it to be displayed on the LCD is done with a Color Enable Register and its associated logic. The Color Enable Register is defined as follows: (Image Omitted) Each of the color bits in the register correspond to the RGB bits of the character attribute.