Color display with thin gap liquid crystal

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(List continued on next page.)

FOREIGN PATENT DOCUMENTS

EP 0 172 473 A2 2/1986

EP 0 344 881 A2 12/1989

EP 0 352 914 A2 1/1990

EP 0 424 880 A2 5/1991

EP 0 438 362 Al 7/1991

EP 0 464 011 Al 1/1992

WO WO 98/27538 6/1998

WO WO 98/27539 6/1998

WO WO 98/27540 6/1998

WO WO 99/34246 7/1999

Primary Examiner—Richard Hjerpe

Assistant Examiner—Ronald Laneau

(74) Attorney, Agent, or Firm—Hamilton, Brook, Smith &

Reynolds, PC.

(57) ABSTRACT

An active matrix color sequential liquid crystal display has an active matrix circuit, a counterelectrode panel and an interposed layer of liquid crystal. The active matrix circuit has an array of transistor circuits formed in a first plane. Each transistor circuit is connected to a pixel electrode in an array of pixel electrodes having a small area. The counterelectrode panel extends in a second plane that is parallel to the first plane, such that the counterelectrode panel receives an applied voltage. The liquid crystal layer is interposed in a cavity between the two planes. In a preferred embodiment, an oxide layer extends over the pixel electrode array. The oxide can have a first thickness in a peripheral region around the array of the pixel electrodes and a thinner second thickness in a pixel electrode region extending over the array of pixel electrodes.

7 Claims, 35 Drawing Sheets

MASTER CLOCK I ^1127

U.S. PATENT DOCUMENTS

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* cited by examiner

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