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Concept Search - What can I type?
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This article describes a relatively low cost method of identifying the coordinate location of a finger placed on a data tablet associated with a display device.
English (United States)
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Finger Point Detection using Gas Panel
This article describes a relatively low cost method of identifying the
coordinate location of a finger placed on a data tablet associated with a display
Referring to Figs. 1 and 2, display generated light spots 1 outside of the
normal viewing area of the display are sequentially scanned in horizontal (X) and
vertical (Y) axes. As shown in Fig. 2, the light emitted is collected by a molded
plastic prism/lens frame 2, passed across the face of the gas panel display 3 and
is collected by a molded lens array 4 for transmittal to three or more
photosensors 5 through plastic fiber-optic strands 6. In the illustrated
embodiment, light transmitted from each lens 2 is sensed by five individual
senors 4. By proper timing of light sources and sensors, a finger touch will effect
only one X and Y positional pair.
Light beams are written and erased sequentially on the display perimeter at a
speed sufficient to catch a fast finger, i.e., approximately 10-30 complete X-Y
search cycles per second. With optical ray tracing using a 0.1" wide source beam
on 0.4" centers, the beam divergence from the collecting prism/lens across a 14"
panel width requires only 3 sensors at the receiving end to assure one unique
source-sensor pair per finger detect. Lenses at the source and sensor give
collection efficiency, assuring reasonable signal-to-noise ratios. A narrow-band
optical filter at the sensor matched to the neon/argon spectral output min...