Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Patent
1988-07-28
1989-09-19
Schreyer, Stafford D.
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
250221, 250553, G08C 2100
Patent
active
048689122
ABSTRACT:
A touch panel system having enhanced touch detection which distinguishes between deliberate actuations of the touch system and accidental and other false actuations. The system has a display surface surrounded by a multiplicity of light emitting elements and light receiving elements that define a grid of intersecting light paths. The display surface is scanned by sequentially enabling selected pairs of the light emitting and light receiving elements. False actuation rejection involves the use of one or more of three techniques: ignoring touches which fail to block a minimum number of contiguous beams in both axes, ignoring touches which block in excess of a specified maximum number of contiguous beams in either axis, and ignoring touches which are of a duration of less than a minimum specified time. The minimum and maximum size constraints on the size of the object touching the screen, and the minimum contact time are programmable. These criteria enable the system to distinguish many types of false hits or accidental touchings of the screen from deliberate touchings by a person selecting an item on the touch panel. An additional feature of the present invention is beam fault tolerance. Whenever a beam component fails, the system can determine exactly which beam element has failed, and can mask out that beam from all future determinations of whether a user selection is being made by touching the screen.
REFERENCES:
patent: 4645920 (1987-02-01), Carroll et al.
Digital Electronics
Schreyer Stafford D.
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