Integrated light sensor for an active matrix liquid crystal disp

Details Integrated light sensor for an active matrix liquid crystal disp Integrated light sensor for an active matrix liquid crystal disp

1996-02-22

1998-11-03

Sikes, William L.

Liquid crystal cells, elements and systems

Particular excitation of liquid crystal

Electrical excitation of liquid crystal

349 70, 349106, 349108, 349116, G02F 1136, G02F 11335, G02F 1133

Patent

active

058316930

ABSTRACT:
The active matrix liquid crystal display panel comprises a matrix of predetermined color filters, arranged in a predetermined configuration within a viewing area, deposited on a first substrate, and a first plate of an activating element is deposited over the matrix of predetermined color filters. A plurality of second plates of the activating element is deposited on a second substrate opposite each color filter. When a predetermined second plate is activated, light is permitted to pass through the corresponding filter, the light exiting the first substrate having the color of the corresponding filter. A plurality of thin film transistors is deposited on the second substrate and forms the control elements, each control element corresponding to a corresponding second plate of the activating element, the control element selecting predetermined second plate in response to control signals. The display panel includes a liquid crystal material filled in a space between the first and second substrate. At least one photodiode is deposited on the second substrate outside the viewing area, the photodiode generating a voltage proportional to ambient lighting conditions around the exterior of the first substrate. The photodiode is fabricated utilizing the same steps utilized in fabricating the display panel.

REFERENCES:
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patent: 4655552 (1987-04-01), Togashi et al.
patent: 4925276 (1990-05-01), McMurray et al.
patent: 4952031 (1990-08-01), Tsunoda et al.
patent: 5039206 (1991-08-01), Wiltshire
patent: 5064275 (1991-11-01), Tsunoda et al.
patent: 5446564 (1995-08-01), Mawatari et al.

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