Capacitive touch screen
First Claim
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1. A detection method for a capacitive touch screen, comprising:
- providing a capacitive touch screen, including;
a conductive strip pattern having a plurality of conductive strips exposed from each other, the conductive strip pattern including;
a plurality of first conductive strips operatively provided with a driving signal during mutual capacitive detection; and
a plurality of second conductive strips providing mutual capacitive coupling signals, the first conductive strips and the second conductive strips being exposed and separated from each other; and
a guarding pattern including a plurality of openings and overlying the conductive strip pattern, wherein the guarding pattern is provided with a direct current (DC) signal, and the conductive strip pattern is exposed from the openings;
simultaneously and continuously providing the driving signal to at least one first conductive strip, and providing a DC signal to first conductive strips not driven by the driving signal; and
generating sensing information based on the mutual capacitive coupling signals provided by the second conductive strips each time the driving signal being provided, wherein each value of the sensing information is the difference between a pair of second conductive strips or the difference between signal differences of two pairs of conductive strips among three conductive strips, and the difference suppresses noise coming from a display,wherein this conductive strip pattern allows that, when a touch area of each external conductive object on the capacitive touch screen is larger than a predetermined condition, the exposed area of the guarding pattern covered by each touch area is larger than the exposed area of the second conductive strips covered by the touch area or larger than the exposed area of the conductive strip pattern covered by the touch area.
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Abstract
The present invention provides a mutual capacitive multi-touch screen, which includes a guarding pattern and a conductive strip pattern exposed from each other. The conductive strip pattern includes a plurality of first conductive strips provided with a driving signal and a plurality of second conductive strips for providing mutual capacitive coupling signals, and the guarding pattern is provided with a DC signal.
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Citations
18 Claims
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1. A detection method for a capacitive touch screen, comprising:
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providing a capacitive touch screen, including; a conductive strip pattern having a plurality of conductive strips exposed from each other, the conductive strip pattern including; a plurality of first conductive strips operatively provided with a driving signal during mutual capacitive detection; and a plurality of second conductive strips providing mutual capacitive coupling signals, the first conductive strips and the second conductive strips being exposed and separated from each other; and a guarding pattern including a plurality of openings and overlying the conductive strip pattern, wherein the guarding pattern is provided with a direct current (DC) signal, and the conductive strip pattern is exposed from the openings; simultaneously and continuously providing the driving signal to at least one first conductive strip, and providing a DC signal to first conductive strips not driven by the driving signal; and generating sensing information based on the mutual capacitive coupling signals provided by the second conductive strips each time the driving signal being provided, wherein each value of the sensing information is the difference between a pair of second conductive strips or the difference between signal differences of two pairs of conductive strips among three conductive strips, and the difference suppresses noise coming from a display, wherein this conductive strip pattern allows that, when a touch area of each external conductive object on the capacitive touch screen is larger than a predetermined condition, the exposed area of the guarding pattern covered by each touch area is larger than the exposed area of the second conductive strips covered by the touch area or larger than the exposed area of the conductive strip pattern covered by the touch area. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A capacitive touch screen, comprising:
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a conductive strip pattern having a plurality of conductive strips exposed from each other, the conductive strip pattern including; a plurality of first conductive strips operatively provided with a driving signal during mutual capacitive detection, wherein first conductive strips not provided with the driving signal are provided with a direct current (DC) signal; and a plurality of second conductive strips providing mutual capacitive coupling signals, the first conductive strips and the second conductive strips being exposed and separated from each other; and a guarding pattern including a plurality of openings and overlying the conductive strip pattern, wherein the guarding pattern is provided with the DC signal, and the guarding pattern and the conductive strip pattern is exposed from the openings, wherein the conductive strip pattern and the guarding pattern allow that, when a touch area of each external conductive object on the capacitive touch screen is larger than a predetermined condition, capacitive coupling between each external conductive object and the guarding pattern is larger than capacitive coupling between the external conductive object and the second conductive strips or larger than capacitive coupling between the external conductive object and the conductive strip pattern. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
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Specification