Touch sensing apparatus and method of operating the same
First Claim
1. A touch sensing apparatus, comprising:
- a touch surface;
a group of emitters arranged to emit light to illuminate at least part of the touch surface, each respective emitter in the group of emitters configured to transmit a frequency modulated emitter signal by way of the emitted light, the frequency modulated emitter signal identifying the respective emitter;
a group of light detectors arranged to receive light from the group of emitters, the group of light detectors configured to generate an output signal; and
at least one processor configured to;
separate light signals received from individual emitters from the output signal based on the frequency modulated emitter signals, apply an algorithm on the separated light signals and determine a position of one or more objects interacting with the touch surface based on the application of the algorithm,wherein the algorithm comprises transmission tomography and wherein the algorithm for transmission tomography generates a two-dimensional model of an interaction between the one or more objects and the touch surface.
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Abstract
A touch sensing apparatus includes a group of emitters arranged to emit light to illuminate at least part of the touch surface, a light detector arranged to receive light from the group of emitters, and a processing element. Each emitter is controlled to transmit a code by way of the emitted light such that the code identifies the respective emitter. The codes may at least partly be transmitted concurrently. The codes may be selected such that a value of an autocorrelation of each code is significantly higher than a value of a cross-correlation between any two codes of different emitters. The processing element processes an output signal from the light detector to separate the light received from the individual emitters based on the transmitted codes, and to determine the position of the object/objects based on the light received from the individual emitters.
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Citations
16 Claims
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1. A touch sensing apparatus, comprising:
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a touch surface; a group of emitters arranged to emit light to illuminate at least part of the touch surface, each respective emitter in the group of emitters configured to transmit a frequency modulated emitter signal by way of the emitted light, the frequency modulated emitter signal identifying the respective emitter; a group of light detectors arranged to receive light from the group of emitters, the group of light detectors configured to generate an output signal; and at least one processor configured to;
separate light signals received from individual emitters from the output signal based on the frequency modulated emitter signals, apply an algorithm on the separated light signals and determine a position of one or more objects interacting with the touch surface based on the application of the algorithm,wherein the algorithm comprises transmission tomography and wherein the algorithm for transmission tomography generates a two-dimensional model of an interaction between the one or more objects and the touch surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of operating a touch sensing apparatus, the touch sensing apparatus including a touch surface, a group of emitters arranged to emit light to illuminate at least part of the touch surface, and a group of light detectors arranged to receive light from the group of emitters, the group of light detectors configured to generate an output signal, said method comprising:
- controlling each respective emitter in the group of emitters to transmit a frequency modulated emitter signal by the emitted light, the frequency modulated emitter signal identifying the respective emitter;
separating light signals received from individual emitters from the output signal based on the frequency modulated emitter signals;
applying an algorithm on the separated light signals; and
determining a position of one or more objects interacting with the touch surface based on the application of the algorithm,wherein the algorithm comprises transmission tomography and wherein the algorithm for transmission tomography generates a two-dimensional model of an interaction between the one or more objects and the touch surface. - View Dependent Claims (16)
- controlling each respective emitter in the group of emitters to transmit a frequency modulated emitter signal by the emitted light, the frequency modulated emitter signal identifying the respective emitter;
Specification