Display-integrated type tablet device

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

1994-07-14

1997-01-07

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345104, G09G 500

Patent

active

055921973

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.

REFERENCES:
patent: 4639720 (1987-01-01), Rympalski et al.
patent: 4839634 (1989-06-01), More et al.
patent: 5283556 (1994-02-01), Ise

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