Touch sensor and signal generation method thereof
First Claim
1. A touch sensor, comprising:
- an input signal generation unit generating an input signal;
a reference signal generation unit delaying the input signal by a predetermined time to generate a first signal;
a plurality of touch sensing signal generation units having a touch pad and delaying the input signal to generate a second signal differently according to whether or not the touch pad is touched;
a plurality of variable delay units varying a delay time in response to a control value of a control signal and delaying the second signal to generate a varied second signal in response to the varied delay time;
a plurality of touch signal generation units generating a touch signal according to a time difference between the first signal and the varied second signal; and
a control unit receiving and analyzing the plurality of touch signals, generating touch outputs when the touch sensor is in an operation mode in which the touch signal is continuously changed, and varying the control signal, obtaining the control signal as a minimum delay value when a value of the touch signals becomes a value indicating that the touch pad is in the touched state, and calculating a difference between the minimum delay value and a sensitivity of the touch pad to determine the control value of the control signal when the touch sensor is in a standby mode in which the touch signal is not changed for a predetermined time.
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Abstract
A touch sensor and a signal generation method thereof are provided. The touch sensor includes: an input signal generation unit generating an input signal; a reference signal generation unit delaying the input signal by a predetermined time to generate a first signal; a plurality of touch sensing signal generation units having a touch pad and delaying the input signal differently according to whether or not the touch pad is touched to generate a second signal; a plurality of variable delay units varying a delay time in response to a control signal and delaying the second signal in response to the varied delay time to generate a varied second signal; a plurality of touch signal generation units generating a touch signal according to a difference in delay time between the first signal and the second signal; and a control unit receiving and analyzing the plurality of touch signals, generating touch outputs when the touch pad is in a touched state, and supplying the control signals to the variable delay units when the touch pad is in a standby state. Accordingly, the delay value may be automatically adjusted even when the delay value, which has been initially set, is varied due to an external environment, so that the touch pad may be prevented from being mis-operated.
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Citations
15 Claims
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1. A touch sensor, comprising:
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an input signal generation unit generating an input signal; a reference signal generation unit delaying the input signal by a predetermined time to generate a first signal; a plurality of touch sensing signal generation units having a touch pad and delaying the input signal to generate a second signal differently according to whether or not the touch pad is touched; a plurality of variable delay units varying a delay time in response to a control value of a control signal and delaying the second signal to generate a varied second signal in response to the varied delay time; a plurality of touch signal generation units generating a touch signal according to a time difference between the first signal and the varied second signal; and a control unit receiving and analyzing the plurality of touch signals, generating touch outputs when the touch sensor is in an operation mode in which the touch signal is continuously changed, and varying the control signal, obtaining the control signal as a minimum delay value when a value of the touch signals becomes a value indicating that the touch pad is in the touched state, and calculating a difference between the minimum delay value and a sensitivity of the touch pad to determine the control value of the control signal when the touch sensor is in a standby mode in which the touch signal is not changed for a predetermined time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of generating a touch signal of a touch sensor, comprising:
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generating an input signal; delaying the input signal by a predetermined time to generate a first signal; delaying the input signal to generate a second signal differently according to whether a touch pad is touched; varying a delay time in response to a control value of a control signal and delaying the second signal to generate a varied second signal in response to the varied delay time; generating a touch signal according to a time difference between the first signal and the varied second signal; and receiving and analyzing the touch signal, generating a touch output when the touch sensor is in an operation mode in which the touch signal is continuously changed, and adjusting the control signal when the touch sensor is in a standby mode in which the touch signal is not changed for a predetermined time, wherein the adjusting of the control signal comprises; varying the control signal; obtaining the control signal as a minimum delay value when a value of the touch signal becomes a value indicating that the touch pad is in a touched state while varying the control signal; and determining the control value of the control signal by calculating a difference between the minimum delay value and a sensitivity of the touch pad. - View Dependent Claims (13, 14, 15)
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Specification