SIGNAL PROCESSING CIRCUIT OF TOUCH SCREEN
First Claim
1. A signal processing circuit of a touch screen, comprising:
- a plurality of driving lines and a plurality of sensing lines arranged to interact with one another in a touch screen panel;
power sources respectively supplying power to each of the driving lines;
sensing channels respectively connected to the sensing lines, wherein each sensing channel is configured to detect a touch by sensing a mutual capacitance on a node where the respective sensing line interacts with a driving line of the plurality of driving lines;
a driving line switch for each driving line, selectively connecting the respective power source to the driving line;
a channel switch for each sensing channel, selectively connecting the respective sensing channel to the sensing line; and
a bypass line configured to connect a driving line of the plurality of driving lines to a sensing line of the plurality of sensing lines by operation of the respective channel switch.
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Accused Products
Abstract
A signal processing circuit of a touch screen is provided. The signal processing circuit can include driving and sensing lines arranged to interact with one another in a touch screen panel, power sources supplying power to each of the driving lines, and sensing channels detecting touch by sensing a mutual capacitance on a node where the sensing line interacts with the driving line. The circuit can also include driving line switches selectively connecting the power sources to the driving lines, channel switches selectively connecting the sensing channels to the sensing lines, and a bypass line allowing the driving line to be connected to the sensing line by operation of the channel switches.
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Citations
18 Claims
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1. A signal processing circuit of a touch screen, comprising:
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a plurality of driving lines and a plurality of sensing lines arranged to interact with one another in a touch screen panel; power sources respectively supplying power to each of the driving lines; sensing channels respectively connected to the sensing lines, wherein each sensing channel is configured to detect a touch by sensing a mutual capacitance on a node where the respective sensing line interacts with a driving line of the plurality of driving lines; a driving line switch for each driving line, selectively connecting the respective power source to the driving line; a channel switch for each sensing channel, selectively connecting the respective sensing channel to the sensing line; and a bypass line configured to connect a driving line of the plurality of driving lines to a sensing line of the plurality of sensing lines by operation of the respective channel switch. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method of detecting a touch of a touch screen, the method comprising:
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providing a signal processing circuit of the touch screen, the signal processing circuit comprising; a plurality of driving lines and a plurality of sensing lines arranged to interact with one another in a touch screen panel; power sources respectively supplying power to each of the driving lines; sensing channels respectively connected to the sensing lines, wherein each sensing channel is configured to detect a touch by sensing a mutual capacitance on a node where the respective sensing line interacts with a driving line of the plurality of driving lines; a driving line switch for each driving line, selectively connecting the respective power source to the driving line; a channel switch for each sensing channel, selectively connecting the respective sensing channel to the sensing line; a bypass line configured to connect a driving line of the plurality of driving lines to a sensing line of the plurality of sensing lines by operation of the respective channel switch; and a distortion detecting unit configured to determine whether noise is present based on a voltage readout by the sensing channels; determining whether noise is present based on a voltage readout by the sensing channels; and if a noise voltage is present, opening the driving line switches such that each power source is disconnected from its respective driving line, and connecting the bypass line to the sensing channel by an operation of the respective channel switch, such that the sensing channel uses the noise voltage as an input voltage; if a noise voltage is not present, connecting each sensing channel to its respective sensing line, such that one end of the bypass line is open and each sensing channels use the power sources as an input voltage. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification