Optical gating scheme for display touch control
First Claim
Patent Images
1. A touch-operated interactive display system including a cathode ray tube having a phosphor covered faceplate and scansion means for energizing the phosphor to illuminate said faceplate;
- graphics control means for controlling the graphics displayed on said faceplate in response to touching of selected areas thereof by the user;
grid producing means including light beam producing means responsive to the illumination from said faceplate for producing a grid of light beams adjacent said faceplate, said grid including said selected areas; and
signal means for generating a signal indicative of the faceplate location of any interruption of said grid by a user.
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Abstract
A touch-operated display for a CRT faceplate includes a plurality of optical gates for energizing light-emitting diodes in response to generation of the CRT raster thus eliminating the need for external switching of the beam generating means to produce the grid of crossing light paths. A frame is disclosed for mounting the light sources, detectors and common optical gates--all of which take the form of silicon chips.
63 Citations
22 Claims
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1. A touch-operated interactive display system including a cathode ray tube having a phosphor covered faceplate and scansion means for energizing the phosphor to illuminate said faceplate;
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graphics control means for controlling the graphics displayed on said faceplate in response to touching of selected areas thereof by the user; grid producing means including light beam producing means responsive to the illumination from said faceplate for producing a grid of light beams adjacent said faceplate, said grid including said selected areas; and signal means for generating a signal indicative of the faceplate location of any interruption of said grid by a user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A touch-operated interactive display system including a cathode ray tube having a phosphor covered faceplate and scansion means for producing a raster for energizing the phosphor and illuminating said faceplate;
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graphics control means for controlling the graphics displayed on said faceplate in response to touching of selected areas thereof by a user; grid producing means including a plurality of light beam producing means positioned along two axes of said faceplate for producing a grid of crossing light beams adjacent to said faceplate, said grid including said selected areas; signal means coupled to said graphics control means for generating a signal indicative of the faceplate location of any interruption of said grid by a user; and said light beam producing means including a plurality of optical gates responsive to illumination of said faceplate whereby said light beam producing means are activated to produce said grid of crossing light beams by operation of said optical gates in response to illumination of said faceplate. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification