Optical touch apparatus and optical touch method
AssigneeWistron Corporation
InventorsKuo-Hsien Lu, Ching-An Cho, Yu-Yen Chen, Chia-Ta Hsieh
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Abstract
An optical touch apparatus and an optical touch method are disclosed. The optical touch apparatus comprises a touch panel, a first optical sensor, a second optical sensor and a processor. The first optical sensor senses a light pen to output a first sensing signal. The second optical sensor senses the light pen to output a second sensing signal. The processor decides a threshold value according to the second sensing signal, and determines whether the first sensing signal is greater than the threshold value. The processor determines that the light pen touches the touch panel if the first sensing signal is greater than the threshold value.
Claims21
An optical touch apparatus, comprising:
- a touch panel;
- a first optical sensor for sensing a first light pen to output a first sensing signal;
- a second optical sensor for sensing the first light pen to output a second sensing signal;
- and
- a processor for deciding a first threshold value according to the second sensing signal, determining whether the first sensing signal is greater than the first threshold value, and determining that the first light pen contacts the touch panel if the first sensing signal is greater than the first threshold value.
An optical touch method, comprising:
- sensing a first light pen to output a first sensing signal by a first optical sensor;
- sensing the first light pen to output a second sensing signal by a second optical sensor;
- deciding a first threshold value according to the second sensing signal;
- determining whether the first sensing signal is greater than the first threshold value;
- and
- determining that the first light pen contacts a touch panel if the first sensing signal is greater than the first threshold value.
Dependencies are inferred from the claim text.