Touch-sensitive data input device
First Claim
1. A touch-sensitive data input device for use with a computer system having a central processing unit (CPU), a memory accessed by the CPU, and a display screen, comprising:
- a demountable bezel, for mounting onto the display screen;
means carried by the bezel, for establishing a grid of light beams in front of the display screen;
means for determining the grid coordinates of an object placed proximate the face of the display screen to interrupt the light beam grid and mark a spot thereon;
means coupled to the grid coordinate determining means, for reporting the grid coordinates to the CPU; and
a storage medium containing a program of instructions to be loaded into the computer system memory, for directing the CPU in execution of a bezel alignment procedure wherein coordinate transforms are generated to translate bezel grid coordinates to display screen coordinates.
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Accused Products
Abstract
A touch-sensitive data input device for use with a computer system having a display screen has a demountable bezel which establishes a grid of light beams in front of the display screen. Misalignment between the display screen frame of reference and the bezel frame of reference is corrected by the calculation of coordinate transforms which are applied to bezel grid coordinates to translate same to display screen coordinates. The coordinate transforms are generated by the computer in accordance with a program of instructions executed in a preliminary bezel alignment procedure.
175 Citations
9 Claims
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1. A touch-sensitive data input device for use with a computer system having a central processing unit (CPU), a memory accessed by the CPU, and a display screen, comprising:
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a demountable bezel, for mounting onto the display screen; means carried by the bezel, for establishing a grid of light beams in front of the display screen; means for determining the grid coordinates of an object placed proximate the face of the display screen to interrupt the light beam grid and mark a spot thereon; means coupled to the grid coordinate determining means, for reporting the grid coordinates to the CPU; and a storage medium containing a program of instructions to be loaded into the computer system memory, for directing the CPU in execution of a bezel alignment procedure wherein coordinate transforms are generated to translate bezel grid coordinates to display screen coordinates. - View Dependent Claims (2, 3)
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4. A computer system comprising:
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a central processing unit (CPU); a memory accessed by the CPU; a display screen coupled to the CPU, for visually displaying data from the CPU; a demountable bezel, for mounting to the display screen; means carried by the bezel, for establishing a grid of light beams in front of the display screen and for detecting an interruption of light beams in the grid; means coupled to the light beam grid and detecting means, for determining the grid coordinates of an object placed proximate the face of the display screen to mark a spot thereon; means coupled to the grid coordinate determining means, for reporting the grid coordinates to the CPU; said CPU translating bezel grid coordinates to display screen coordinates in accordance with instructions stored in the memory. - View Dependent Claims (5, 6, 7, 8)
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9. A touch-sensitive data input device for use with a display screen, comprising:
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a plurality of light beam emitters and detectors; means for mounting the emitters and detectors rigidly with respect to each other in an assembly removably mountable to a display screen; said mounting means arranging the emitters and detectors around the top, sides, and bottom of the display screen so as to dispose each emitter directly across from a detector and on opposite sides of the screen; a circuit for enabling multiple pairs of said emitters and detectors sequentially to produce multiple beams scanning across said display screen; a detector circuit for detecting an interruption of said beams; and an enclosure for the emitters and detectors made of a material having a light transmission spectrum matched to the emission spectrum of the emitters.
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Specification