IR touch
First Claim
1. In a touch screen system comprising two perpendicular axes populated with opposing photo emitters and photo receivers, the improvement wherein the system comprises a controller that controls pulsing of the photo emitters, polls an analog output from the photo detectors, decodes the analog output from the photo detectors, and reports corresponding coordinates to a host computer, and a series of daughter boards daisy chained together that include a chain of emitter boards, each emitter board having the capability of receiving data control signals from the controller or another emitter board, and each emitter board having the capability of transmitting said data control signals to other emitter boards in the chain, and a chain of receiver hoards, each receiver board having the capability of receiving and sending data control signals from the controller or a receiver board, and each having the capability of transmitting said data control signals to other receiver boards in the chain.
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Accused Products
Abstract
There is disclosed and claimed new and improved photoelectric sensing array system, method, and apparatus for large area IR touch screens to increase the resolution of the array, and to provide ease of manufacture and testing.
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Citations
20 Claims
- 1. In a touch screen system comprising two perpendicular axes populated with opposing photo emitters and photo receivers, the improvement wherein the system comprises a controller that controls pulsing of the photo emitters, polls an analog output from the photo detectors, decodes the analog output from the photo detectors, and reports corresponding coordinates to a host computer, and a series of daughter boards daisy chained together that include a chain of emitter boards, each emitter board having the capability of receiving data control signals from the controller or another emitter board, and each emitter board having the capability of transmitting said data control signals to other emitter boards in the chain, and a chain of receiver hoards, each receiver board having the capability of receiving and sending data control signals from the controller or a receiver board, and each having the capability of transmitting said data control signals to other receiver boards in the chain.
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20. In an IR touch screen system consisting of two perpendicular axes populated with opposing pairs of LED photo emitters and LED photo receivers, wherein IR photons are transmitted from a photo emitter to an opposing photo receiver, the improvement which comprises a series of daughter boards daisy chained together characterized by a chain of emitter boards containing photo emitters, each having the capability of receiving data control signals from a controller hoard or another photo emitter board, and each having the capability of transmitting said data control signals to other emitter boards in the chain, a chain of receiver boards containing photo receivers, each having the capability of receiving and sending data control signals from the controller board or a receiver board, and each having the capability of transmitting said data control signals to other receiver boards in the chain, and a controller which pulses the photo emitters, polls the analog output from the photo detectors, decodes the analog output from the photo detectors, and reports corresponding coordinates to a host computer.
Specification