Display-integrated type tablet device

Details Display-integrated type tablet device Display-integrated type tablet device

1992-05-13

1995-02-21

Weldon, Ulysses

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345103, 345173, G06F 303

Patent

active

053920589

ABSTRACT:
A multiplexer 13 selects the input terminal B side for a display period while it selects the input terminal A side for a coordinate detection period. A lower common drive circuit 2L, based on shift data transmitted from the multiplexer 13, operates in parallel with an upper common drive circuit 2U during the display period while it operates in series with the upper common drive circuit 2U during the coordinate detection period. An upper segment drive circuit 3U and a lower segment drive circuit 3L simultaneously operate to drive upper segment electrodes XU and lower segment electrodes XL simultaneously in the same direction. Thus, during the display period there is displayed an image simultaneously onto the upper half 1wU and the lower half 1wL of a display panel 1w, thereby improving the duty ratio of display. During the coordinate detection period, on the other hand, the upper half 1wU and the lower half 1wL of the display panel 1w are serially scanned during the coordinate detection period, whereby y-coordinates of two points P.sub. 1 and P.sub.2 are detected correctly.

REFERENCES:
patent: 4224615 (1980-09-01), Penz
patent: 4814760 (1989-03-01), Johnston et al.
patent: 4841290 (1989-06-01), Nakano et al.
patent: 4875036 (1989-10-01), Washizuka et al.
patent: 4875378 (1989-10-01), Yamazaki et al.
patent: 5122787 (1992-06-01), Fujita et al.
patent: 5136404 (1992-08-01), Nobile et al.
patent: 5159323 (1992-10-01), Mase et al.

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