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Liquid Crystal Display Pel/Driver Diagnostic Test

IP.com Disclosure Number: IPCOM000039451D
Original Publication Date: 1987-Jun-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Baier, KJ Karas, FD [+details]

Abstract

A method is described to provide a pel/driver test that allows utilization of existing IBM Personal Computer (PC) cathode ray tube (CRT) display adapter diagnostic code with minimal modifications to test a liquid crystal display (LCD) and LCD controller. Diagnostics are tests that are used to test a base system and I/O functions that require user interaction, intervention or long execution time for verification of correct system operation. Previous IBM PC systems used CRT-type displays. On this type of display, the image is painted on the screen by intensity modulating an electron beam that is deflected by applying an analog electrostatic or electromagnetic force. The LCD displays an image by incrementing row and counter registers.