Touch screen input system
First Claim
Patent Images
1. A touch screen input system for use with a display screen having a photo-active display surface including a controllable sweeping beam, said system comprising:
- at least one photo-detector means, means for mounting the photo-detector means adjacent the photo-active display surface but in non-interfering view of the photo-active display surface, in combination with detection means comprising means for continuously registering the position of the beam in the display surface including counter means, pointer means adapted to reflect light directly from the beam to said photo-detector means, a latch means coupled from said counter means and having a latching input, and means coupling from said photo-detector means to said latch input and responsive to an AC-coupled signal transition from said photo-detector means to activate said latch means and thereby hold a signal identifying display screen location corresponding to pointer means location.
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Abstract
A touch screen input system for use with a display screen having a photo-active display surface including a controllable sweeping beam. The system includes at least one photo-detector in combination with detection circuitry for continuously registering the position of the beam in the display surface. A pointer is adapted to reflect light from the beam to the photo-detector to provide a latch signal which is used to hold a signal identifying display screen location corresponding to pointer means location.
150 Citations
29 Claims
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1. A touch screen input system for use with a display screen having a photo-active display surface including a controllable sweeping beam, said system comprising:
- at least one photo-detector means, means for mounting the photo-detector means adjacent the photo-active display surface but in non-interfering view of the photo-active display surface, in combination with detection means comprising means for continuously registering the position of the beam in the display surface including counter means, pointer means adapted to reflect light directly from the beam to said photo-detector means, a latch means coupled from said counter means and having a latching input, and means coupling from said photo-detector means to said latch input and responsive to an AC-coupled signal transition from said photo-detector means to activate said latch means and thereby hold a signal identifying display screen location corresponding to pointer means location.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 10, 11, 12, 13, 14, 15, 16, 17)
- 8. A method of detecting the position of a pointer means on a display screen having a photo-active display surface including a controllable sweeping beam, said system comprising the steps of photo-electrically detecting reflected light from the beam directly reflected from the pointer means by means of impulse detection of light, continuously registering the position of the beam in the display surface, and holding a signal identifying display screen location corresponding to pointer means location upon such impulse detection of said photo-electric signal.
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9. A touch screen input system for use with a display screen having a photo-active display surface including a controllable continuously sweeping raster scan beam, said system comprising;
- at least one photo-detector means disposed adjacent the photo-active display surface, in combination with detection means and pointer means, said pointer means adapted to reflect light directly from the continuous raster scan beam to said photo-detector means to provide a latch signal, said detection means including registering means responsive to said latch signal for providing a position signal identifying display screen location corresponding to pointer means location, said latch signal being provided by means including an amplifier means and means for AC coupling the amplifier means between the photo-detector means and the registering means.
- View Dependent Claims (19, 20, 21, 22, 23, 24)
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25. A touch screen input system for use with a display screen having a photo-active display surface including a controllable sweeping beam, said system comprising;
- at least one photo-detector means disposed adjacent the photo-active display surface, in combination with detection means and pointer means, said pointer means adapted to reflect light directly from the beam to said photo-detector means to provide a latch signal, said detection means including registering means responsive to said latch signal for providing a position signal identifying display screen location corresponding to pointer means location, said photo-detector means being disposed outside of the bounds of said photo-active display surface and substantially in a plane defined by the photo-active display surface.
- View Dependent Claims (26, 27, 28)
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29. A method of detecting a position of a pointer means on a display screen having a photo-active display surface including a controllable continuously sweeping raster scan beam, said system comprising the steps of providing a photoelectric detecting means, disposing the photoelectric detecting means outside of the bounds of said photo-active display surface and substantially in a plane defined by the photoactive display surface, photo-electrically detecting reflected light from the beam directly reflected from the pointer means, continuously registering the position of the beam in the display surface, and holding a signal identifying display screen location corresponding to pointer means location upon impulse detection of said photoelectric signal.
Specification