Coordinate input device

Computer graphics processing and selective visual display system – Display peripheral interface input device – Touch panel

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345178, G09G 500

Patent

active

056063466

ABSTRACT:
A coordinate input device including a matrix-type display panel having a plurality of row electrodes arranged in parallel, a plurality of column electrodes arranged in parallel, the row electrodes and the column electrodes being disposed to face each other, and liquid crystal disposed between the row electrodes and the column electrodes. The device also includes a row electrode driving circuit, a column electrode driving circuit, a controller for controlling these driving circuits, an input pad disposed to allow direct contact with the operator, and a coordinate detection circuit for calculating a coordinate value based on a signal input thereto through the input pad. When a position on the display panel is pressed with a finger, a driving signal supplied to the row electrode or the column electrode corresponding to the position is transmitted through the operator to the input pad. The coordinate of the position is detected based on the transmitted signal.

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IBM Technical Disclosure Bulletin, vol. 34, No. 7B, Dec. 1991, "Methods To Minimize The Effects Of LCD M-Signal Noise On The Operation Of An Attached Sensor Screen", pp. 435-436.

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