Coordinative detecting methods and apparatus for liquid crystal

Details Coordinative detecting methods and apparatus for liquid crystal Coordinative detecting methods and apparatus for liquid crystal

1994-10-07

1997-06-10

Hjerpe, Richard

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345 87, 345103, 345201, G09G 336

Patent

active

056380895

ABSTRACT:
A coordinate detecting method for a liquid crystal display unit has the steps of generating a second display control signal for controlling a display provided in a display period and a non-display period on the basis of a first display control signal set such that one frame is constructed by only the display period; the display period and the non-display periods being set such that an image is displayed on a liquid crystal panel in the display period and is not displayed on the liquid crystal panel in the non-display period; storing transmitted image data to a memory in accordance with timings shown by the first display control signal; reading these stored image data from the memory in accordance with timings shown by the second display control signal; displaying the image on the liquid crystal panel by the read image data and the second display control signal; and detecting coordinates by a detecting pen in the non-display period. A coordinate detecting method and an apparatus for a liquid crystal integral type tablet is also shown.

REFERENCES:
patent: 3818482 (1974-06-01), Yoshida
patent: 4824212 (1989-04-01), Taniguchi
patent: 5347294 (1994-09-01), Usui et al.
patent: 5357266 (1994-10-01), Tagawa
patent: 5392058 (1995-02-01), Tagawa
patent: 5457482 (1995-10-01), Rhoden

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