Touch sensing display screen signal processing apparatus and met

Details Touch sensing display screen signal processing apparatus and met Touch sensing display screen signal processing apparatus and met

1989-03-14

1990-04-17

Schreyer, Stafford D.

Telegraphy

Systems

Position coordinate determination for writing

340718, 340720, G08C 2100

Patent

active

049182625

ABSTRACT:
A touch sensing display apparatus having improved electrical signal processing is described. A plurality of signal threshold comparison levels are employed by the electronic signal calculating and processing unit to identify actual touch signals and to exclude extraneous vibration and offset signal components. Static thresholds of comparison are utilized at lower signal levels and a dynamic, signal tracking threshold is utilized at higher signal levels. The apparatus is particularly effective for use in designs employing a suspended CRT display or other display device in which the screen of the display device is directly touched by a user to record selections of information presented or to input graphical or handwritten information.

REFERENCES:
patent: 4511760 (1985-04-01), Garwin et al.

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