Matrix display device with write-in facility

Details Matrix display device with write-in facility Matrix display device with write-in facility

1991-11-26

1996-01-16

Chin, Tommy P.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345207, G09G 328

Patent

active

054851777

ABSTRACT:
An active matrix liquid crystal display device in which an array of picture elements which include respective switching means, e.g. TFTs, are driven a row at a time by drive signals supplied via a set of row and a set of column address conductors. The device also includes an array of active addressed sensing elements each consisting of a photosensitive element, e.g. a thin film photoresistor or photodiode, a charge storage capacitor and a switching device, e.g. a TFT. The sensing element connected to respective row and column address conductors. The charge storage capacitors are periodically charged through operation of their associated switching devices by the drive signals and are selectively discharged via their associated photosensitive element when illuminated by, for example, a light pen. The states of the charge storage capacitors of all of the sensing elements are determined, one row at a time, by a detection circuit connected to the column address conductors during each display field period in synchronism with the driving of the rows of picture elements.

REFERENCES:
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patent: 4430648 (1984-02-01), Togahi et al.
patent: 4582395 (1986-04-01), Morozumi
patent: 4655552 (1987-04-01), Togashi et al.
patent: 4846559 (1989-07-01), Kniffler
patent: 5151688 (1992-09-01), Tanaka et al.
patent: 5204661 (1993-04-01), Hack et al.

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