Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1990-03-20
1994-02-01
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
359 53, G09G 336
Patent
active
052835634
ABSTRACT:
A liquid crystal display (LCD) is provided with a source of backlighting which augments reflected incident light to provide increased contrast. A liquid crystal cell which does not contain dye, but becomes clear when a field is applied, is sandwiched in back of a liquid crystal cell with a dye and electrically connected so that when the front liquid crystal cell is turned ON to make selected portions of it transparent, the back liquid crystal cell is OFF so that corresponding portions of it are highly reflecting. No voltage is allowed to be applied across nonselected portions of the front liquid crystal and a voltage is applied across corresponding nonselected portions of the back liquid crystal making the nonselected portions of the back liquid crystal clear, producing a display of high contrast. Sandwiched to the rear of the back liquid crystal cell is a clear plastic wedge which is edge lighted. The edge lighted wedge only appears bright in the areas where the voltage on the back liquid crystal cell is OFF or not applied thereto.
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Allen Gary R.
Davenport John M.
Finch William W.
Hansler Richard L.
Miller Stuart C.
Corwin Stanley C.
General Electric Company
Hawranko George E.
Mengistu Amare
Oberley Alvin E.
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