CONTROL CIRCUIT OF TOUCH SCREEN AND NOISE REMOVING METHOD
First Claim
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1. A control circuit of a touch screen, comprising:
- a differential sensing unit configured to generate a delta value corresponding to a difference between charges stored in two adjacent detection lines of a touch screen panel; and
an integration unit configured to integrate the delta value outputted from the differential sensing unit.
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Abstract
The present invention discloses a control circuit of a touch screen and a noise removing method. The present invention provides a technique for performing differential sensing on two adjacent detection lines of a touch screen panel and integrating a differential sensing signal to filter noise. The control circuit and the noise removing method may remove display noise having an effect on two adjacent detection lines, three-wavelength lamp noise having a predetermined frequency, 60 Hz noise, and charger noise caused by battery charging.
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Citations
17 Claims
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1. A control circuit of a touch screen, comprising:
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a differential sensing unit configured to generate a delta value corresponding to a difference between charges stored in two adjacent detection lines of a touch screen panel; and an integration unit configured to integrate the delta value outputted from the differential sensing unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A noise removing method for a touch screen, comprising:
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generating a differential sensing signal corresponding to a difference between detection signals of two adjacent detection lines of a touch screen panel at a predetermined period; storing the differential sensing signal at each period; determining whether or not noise is applied to the two detection lines at each period; and integrating the differential sensing signal stored at a previous period in response to a state in which the noise is not applied, and blocking transmission of the differential sensing signal stored at the previous period for integration in response to a state in which the noise is applied. - View Dependent Claims (11)
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12. A control circuit of a touch screen, comprising:
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a differential sensing unit configured to generate a differential sensing signal corresponding to a difference between detection signals of two adjacent detection lines of a touch screen panel; a noise detection unit configured to generate a noise detection signal which is activated when noise is applied to at least one of the two detection lines; a delay unit configured to store the differential sensing signal at each period and selectively output a differential sensing signal stored at a previous period in response to the noise detection signal; and an integration unit configured to integrate the differential sensing signal transmitted from the delay unit. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification