METHOD AND APPARATUS FOR GENERATING DRIVER SIGNALS OF SAW TOUCH PANEL
First Claim
1. A method for generating driver signals of SAW touch panel, comprising the steps of:
- sending a trigger signal continuously by referring to an input signal, wherein the trigger signal is sent when the input signal is within a predetermined range;
generating a surface acoustic wave according to the trigger signal;
transmitting the surface acoustic wave to at least one transducer via a touch surface; and
detecting the input signal via at least one transducer,wherein the input signal is kept on a predetermined level when the surface acoustic wave has not been received by the transducer and when a noise signal from circuits outside the transducer has not been added in the input signal, andwherein the predetermined level is within the predetermined range.
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Abstract
The present invention relates to a method and apparatus for generating driver signals of SAW touch panel. The method includes the steps of: sending a trigger signal continuously by referring to an input signal, wherein the trigger signal is sent when the input signal is within a predetermined range; generating a surface acoustic wave according to the trigger signal; transmitting the surface acoustic wave to at least one transducer via a touch surface; and detecting the input signal via at least one transducer. Moreover, the input signal is kept on a predetermined level when the surface acoustic wave has not been received by the transducer and when a noise signal from circuits outside the transducer has not been added in the input signal. The predetermined level is within the predetermined range. The sensing accuracy of the SAW touch panel can be enhanced because the noise signal has less effect on the driver signals.
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Citations
20 Claims
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1. A method for generating driver signals of SAW touch panel, comprising the steps of:
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sending a trigger signal continuously by referring to an input signal, wherein the trigger signal is sent when the input signal is within a predetermined range; generating a surface acoustic wave according to the trigger signal; transmitting the surface acoustic wave to at least one transducer via a touch surface; and detecting the input signal via at least one transducer, wherein the input signal is kept on a predetermined level when the surface acoustic wave has not been received by the transducer and when a noise signal from circuits outside the transducer has not been added in the input signal, and wherein the predetermined level is within the predetermined range. - View Dependent Claims (2, 3, 4, 5)
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6. A apparatus for generating driver signals of SAW touch panel, comprising:
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a detecting circuit having at least one transducer, the detecting circuit detecting an input signal via the at least one transducer; and a control circuit electrically connected to the detecting circuit, wherein the control circuit is adapted to send a trigger signal continuously by referring to the input signal, once each of the trigger signals is to be triggered, the control circuit is adapted to send the trigger signal when the input signal is within a predetermined range. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A method for generating driver signals of SAW touch panel, comprising the steps of:
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detecting an input signal via at least one transducer; and sending a trigger signal continuously by referring to the input signal, wherein once each of the trigger signals is to be triggered, the trigger signal is sent when the input signal is within a predetermined range. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification