Touched state recognition apparatus for matrix type touch panel

Details Touched state recognition apparatus for matrix type touch panel Touched state recognition apparatus for matrix type touch panel

1997-08-27

2000-02-08

Saras, Steven J.

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

345146, G09G 500

Patent

active

06023265&

ABSTRACT:
A touched state recognition apparatus for a matrix type touch panel and a control method thereof which are capable of correctly recognizing a touched state of a touch switch even when two touch switches are concurrently touched. The touched state recognition apparatus for a matrix type touch panel which includes a touch panel which acts as a switch or a keyboard and has an upper plate and a lower plate each having a plurality of electrodes, a touch processor for applying a checking signal to the touch panel, receiving a detection signal with respect to the touched region, judging the touched region, comparing the number of touch switches contained in the touched region with the area of the touch switch, and judging the touched touch switch, a memory for storing a graphic data therein which corresponds to a coordinate of a region of the touch panel and each touch switch therein, a microprocessor for receiving a signal from the touch processor, which signal corresponds to whether a predetermined touch switch is touched, executing a screen control program corresponding to the touch switch, reading a graphic data from the memory, and outputting the thusly read graphic data, a graphic controller for outputting a graphic signal by which a graphic data from the microprocessor is displayed, and a display device for receiving the graphic signal from the graphic controller and displaying the same.

REFERENCES:
patent: 5740390 (1998-04-01), Pickover
patent: 5757358 (1998-05-01), Osga

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