Pen input display device

Details Pen input display device Pen input display device

2007-04-17

2007-04-17

Eisen, Alexander (Department: 2629)

Computer graphics processing and selective visual display system

Display peripheral interface input device

Touch panel

C178S018040

Reexamination Certificate

active

10673389

ABSTRACT:
A pen input unit includes ultrasonic receivers that receive an ultrasonic signal transmitted from an ultrasonic transmitter of an input pen. Based on the received signal, the distance (distance value) of the ultrasonic transmitter from each of the ultrasonic receivers is determined. The distance value is used for the display control of the display panel, and is supplied to a reception sensitivity control section. The reception sensitivity control section carries out reception sensitivity control for reducing a difference in level of the respective waveforms received by the ultrasonic receivers. As a result, a pen input display device of an ultrasonic pen input system is provided that prevents errors over the entire input area of the display panel without increasing power consumption or impairing operability of pen entry.

REFERENCES:
patent: 4814552 (1989-03-01), Stefik et al.
patent: 5717168 (1998-02-01), DeBuisser et al.
patent: 6535147 (2003-03-01), Masters et al.

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