Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel
Patent
1992-03-11
1994-10-18
Weldon, Ulysses
Computer graphics processing and selective visual display system
Display peripheral interface input device
Touch panel
345104, G09G 302
Patent
active
053572661
ABSTRACT:
A switching circuit 7 switchedly selects the side of a detection control circuit 6 for the coordinate detection period in compliance with control of a control circuit 10. Then according to each signal from the detection control circuit 6, a segment drive circuit 3 generates a segment electrode scan signal to scan segment electrodes X of a liquid crystal panel 1 in turn. Subsequently, a common drive circuit 2 generates a common electrode scan signal to scan common electrodes Y in turn. An x-coordinate detection circuit 8 and a y-coordinate detection circuit 9 detects the x- and y-coordinates of the tip of an electronic pen 11 on the basis of an induced voltage developed to a tip electrode of the electronic pen 11. During the display period, the side of a display control circuit 4 is switchedly selected, displaying an image onto the liquid crystal panel 1. Thus, there is provided a display-integrated type tablet device into which display function has been integrated, in order to make the image easy-to-view and the device itself more compact, less costly.
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"An LCD With Input Function Using Electrodes for Display The Development of 12S.times.160 Pixel LCD".
Weldon Ulysses
Wu Xiao M.
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