Browse Prior Art Database

Programmable Viewing Angle Control for a Liquid Crystal Display

IP.com Disclosure Number: IPCOM000039816D
Original Publication Date: 1987-Aug-01
Included in the Prior Art Database: 2005-Feb-01

Publishing Venue

IBM

Related People

Authors:
Blair, BE Council, NE [+details]

Abstract

The viewing angle of a liquid crystal display is changed digitally under control of the microprocessor with which it is associated, thus avoiding the need for analog control by a potentiometer. This is especially useful in an application where digital remote control must be used to control the viewing angle. (Image Omitted) Liquid crystal displays (LCDs) have a very narrow viewing cone (about 20~ of arc) that can be moved according to the amount of voltage used to drive the LCD. This article describes a method of controlling the voltage and hence the viewing angle from the microprocessor, preferably under program control, to provide an optimum angle of an LCD for either sitting or standing operators. Dot matrix LCDs generally require more than a 5-volt drive voltage to operate correctly.