Touch screen and related touch sensing control circuit
First Claim
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1. A touch screen, comprising:
- a display device having a pixel array, comprising;
a plurality of data lines, arranged for driving the pixel array; and
a common electrode layer, having a plurality of openings, arranged for providing a common voltage to the pixel array; and
a touch sensing control circuit, coupled to the common electrode layer and a plurality of first data lines of the plurality of data lines, arranged for generating a first touch driving signal and applying the first touch driving signal to the plurality of first data lines; and
detecting a plurality of touch sensing signals respectively from a plurality of common electrodes of the common electrode layer when the first touch driving signal is applied to one of the first data lines wherein the openings are arranged for reducing a base capacitance induced between at least one of the common electrodes and at least one of data lines and the openings are aligned with a direction along which the first driving signal is transmitted in an area of touch sensing; and
the touch sensing control circuit further generates a second touch driving signal and applies the second touch driving signal to a plurality of second data lines of the data lines;
the polarity of the first touch driving signal is different from a polarity of the second touch driving signal such that the second touch driving signal applied to the data lines leads to reduction of the base capacitance.
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Abstract
Disclosed herein are touch screens that integrate touch sensing systems with display devices. The touch sensing system serves data lines and common electrodes of a driving circuitry of the display device as touch driving lines and touch sensing lines for touch sensing operations. A common electrode layer having the common electrodes of the driving circuitry includes a plurality of openings for reducing a base mutual-capacitance of the touch sensing system.
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Citations
12 Claims
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1. A touch screen, comprising:
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a display device having a pixel array, comprising; a plurality of data lines, arranged for driving the pixel array; and
a common electrode layer, having a plurality of openings, arranged for providing a common voltage to the pixel array; and
a touch sensing control circuit, coupled to the common electrode layer and a plurality of first data lines of the plurality of data lines, arranged for generating a first touch driving signal and applying the first touch driving signal to the plurality of first data lines; and
detecting a plurality of touch sensing signals respectively from a plurality of common electrodes of the common electrode layer when the first touch driving signal is applied to one of the first data lines wherein the openings are arranged for reducing a base capacitance induced between at least one of the common electrodes and at least one of data lines and the openings are aligned with a direction along which the first driving signal is transmitted in an area of touch sensing; and
the touch sensing control circuit further generates a second touch driving signal and applies the second touch driving signal to a plurality of second data lines of the data lines;
the polarity of the first touch driving signal is different from a polarity of the second touch driving signal such that the second touch driving signal applied to the data lines leads to reduction of the base capacitance. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A touch sensing control circuit, comprising:
a signal generation circuit, coupled to a plurality of data lines of a display device, for generating a first touch driving signal, and applying the first touch driving to a plurality of first data lines of the data lines; and
a detection circuit, coupled a plurality of common electrodes of the display device, for detecting a plurality of touch sensing signals from the common electrodes when the first touch driving signal is applied to one of the first data lines;
wherein the common electrodes of the display device has a plurality of openings, and the openings are arranged for reducing a base capacitance induced between at least one of the common electrodes and at least one of data lines and the openings are aligned with a direction along which the first driving signal is transmitted in an area of touch sensing; and
the signal generation circuit further generates a second touch driving signal and applies the second touch driving signal to a plurality of second data lines of the data lines;
the polarity of the first touch driving signal is different from a polarity of the second touch driving signal such that the second touch driving signal applied to the data lines leads to reduction of the base capacitance.- View Dependent Claims (9, 10, 11, 12)
Specification