US 4,668,071 AGranted

Character generator using cathode ray tube activated liquid crystal display

AssigneesRicoh Company, Ltd., Ricoh Systems, Inc.

InventorEdward F. Mayer

Life of this patent

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Abstract

A liquid crystal display is provided on the surface of a vidicon face plate. A number of conductive pins or electrodes connect to associated field effect transistors imbedded in the liquid crystal display for selectively energizing discrete areas in the liquid crystal display; the pins extend through the vidicon face plate. The electron beam of the vidicon is scanned sequentially across the terminals, and is turned on and off in accordance with stored binary data to impinge upon and selectively activate certain ones of the pins or electrodes, turning on the associated FET. After the full face of the vidicon has been scanned to form the desired pattern of activated FET's, a voltage is applied across the liquid crystal display. The area opposite each turned on FET will be appropriately polarized presenting a display on the outward facing surface of the display. This display is used to excite a photoconductive drum such as in an electrostatic photocopier to print a copy of the display data.

Claims5

Dependent claims

Apparatus for recording high resolution binary data at selected positions on an erasable reuseable photoresponsive medium including means for producing character data signals in binary format,

a liquid crystal display divided into a plurality of elements, each of said elements being capable of displaying at least a portion of one of said characters, said display being exposed to said photoresponsive medium,
an array of semiconductor devices for controlling the state of each of said elements, each of said semiconductor devices comprising a bistable switch having a control electrode responsive to impingement of an electron beam to change the state of the device,
means for scanning an electron beam selectively across the control terminals of said devices comprising a cathode ray tube including an electron beam source and means for controlling the horizontal and vertical deflection of said beam across the face of said tube and thereby across the control terminals of said devices, said scanning means including means responsive to said digital data for turning said beam on and off as it is deflected across said terminals, and
means for energizing said display, the characters being exposed on the face of said display and recorded on said photoresponsive medium.

1 more element

Dependencies are inferred from the claim text.

Facts

Application: 06/588,129Filed 9 Mar 1984
Granted: 26 May 1987
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

G02F 1/133348
Constructional arrangements; Manufacturing methods: charged particles addressed liquid crystal cells, e.g. controlled by an electron beam
B41B 19/04
The characters appearing on the screen in succession: at the same place
G06K 15/1233
By photographic printing , e.g. by laser printers: using a cathode-ray tube or an optical-fibre tube
G06K 15/1238
By photographic printing , e.g. by laser printers: simultaneously exposing more than one point