Accession Number : ADD008788

Title :   LCD Controller.

Descriptive Note : Patent,


Personal Author(s) : Louie,Anthony C H ; Young,Stephen H

Report Date : 23 Jun 1981

Pagination or Media Count : 17

Abstract : A liquid crystal control unit is programmable to produce appropriate driving waveforms to operate a liquid crystal for displaying an optical image of input information. The input information optionally is from a digital computer or from an electronic camera. A liquid crystal display (LCD) is actuated to display a portion of or all of an analog television signal or a digital computer originating signal. A conventional television signal is fed through a buffer which in turn couples the signal in parallel to a sync stripper, a video mixer, and a conditioner. From the sync stripper, a phase lock loop creates clock pulses which control horizontal size, sample and position circuitry and vertical size, sample and position circuitry. The system affords considerable flexibility since the sampling rate and location within the TV picture are displayed on the LCD and can be adjusted by the frequency of the clock pulses originating in the phase lock loop and the size and position of the vertical and horizontal gates. The system affords considerable flexibility since the controller can provide electronic control for LCD any size from 100 by 100, 200 by 200, 400 by 400, etc. By merely expanding the size of the LCD arrays, greater resolution and pictorial information may be conveyed while operation on a sequential or a random access basis is optional. (Author)

Descriptors :   *Patents, *Drives(Electronics), *Liquid crystal display systems, Signal processing, Control sequences, Synchronization(Electronics), Analog to digital converters, Arrays, Resolution, Buffer storage, Shift registers

Subject Categories : Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE