Patent ID: 7956850
Filing Date: 2011-06-07
Classification: H03K

Abstract:
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.