Display integrated type position reading apparatus

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

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345182, 178 18, G09G 302

Patent

active

053271637

ABSTRACT:
A display integrated type position reading apparatus includes a display device driven for display in accordance with a driving signal in synchronization with a predetermined clock signal, and a conductive tablet mounted on a display screen of the display device. In operation, a CPU controls a tablet controller to apply voltage to the tablet. In response to a depression of an arbitrary position on the main surface of the tablet, the CPU reads out the depressed position as a digital signal via an A/D converter. The sampling by the A/D converter relating to reading is carried out at sampling points so as to avoid the mixing of noise, caused by a signal for driving the display unit, into the digital signal, resulting in an improvement in the read out accuracy of the depressed position.

REFERENCES:
patent: 4841290 (1989-06-01), Nakano et al.
patent: 4910363 (1990-03-01), Kobayashi et al.
patent: 5083118 (1992-01-01), Kazama
IBM Technical Discosure 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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