CAPACITIVE TOUCH DETECTING DEVICE AND METHOD USING LEVEL SHIFT, AND DISPLAY DEVICE USING THE SAME
First Claim
1. A capacitive touch detecting device for detecting occurrence of a touch capacitance (Ct) by an approach of a bodily finger or a touch input instrument such as a conductor similar to the bodily finger, the capacitive touch detecting device comprising:
- at least one sensor pattern that forms the touch capacitance (Ct) between the touch input instrument and the sensor pattern, and that is disposed at a distance spaced from a common electrode to thus form a common electrode capacitance (Cvcom);
a charging unit that supplies a charge signal to the sensor pattern to thus accumulate charges in the common electrode capacitance (Cvcom); and
a level shift detecting unit that is connected to the sensor pattern, and that detects a level shift occurs in a voltage variation in the sensor pattern at the time of occurrence of a touch input, with respect to another voltage variation in the sensor pattern at the time of non-occurrence of a touch input, to thereby acquire a touch signal,wherein the common electrode has a common voltage (Vcom) level that alternates at a predetermined frequency, andwherein the level shift detecting unit detects a level shift between the voltage variations arising from the sensor pattern by the common voltage (Vcom) before and after the occurrence of the touch input.
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Accused Products
Abstract
Provided is a touch detecting device that detects occurrence of a level shift phenomenon of a voltage variation to thus acquire a touch signal, when a touch capacitance due to a touch input is added to a common electrode capacitance formed between a common electrode and a sensor pattern. Accordingly, the touch signal may be stably obtained in spite of external noise, and an influence due to a parasitic capacitance may be minimized.
35 Citations
20 Claims
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1. A capacitive touch detecting device for detecting occurrence of a touch capacitance (Ct) by an approach of a bodily finger or a touch input instrument such as a conductor similar to the bodily finger, the capacitive touch detecting device comprising:
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at least one sensor pattern that forms the touch capacitance (Ct) between the touch input instrument and the sensor pattern, and that is disposed at a distance spaced from a common electrode to thus form a common electrode capacitance (Cvcom); a charging unit that supplies a charge signal to the sensor pattern to thus accumulate charges in the common electrode capacitance (Cvcom); and a level shift detecting unit that is connected to the sensor pattern, and that detects a level shift occurs in a voltage variation in the sensor pattern at the time of occurrence of a touch input, with respect to another voltage variation in the sensor pattern at the time of non-occurrence of a touch input, to thereby acquire a touch signal, wherein the common electrode has a common voltage (Vcom) level that alternates at a predetermined frequency, and wherein the level shift detecting unit detects a level shift between the voltage variations arising from the sensor pattern by the common voltage (Vcom) before and after the occurrence of the touch input. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A capacitive touch detecting method for detecting occurrence of a touch capacitance (Ct) by an approach of a touch input instrument to at least one sensor pattern, the capacitive touch detecting method comprising the steps of:
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supplying a charging signal to the sensor pattern and a common electrode capacitance (Cvcom) formed in the sensor pattern; interrupting the supply of the charging signal and isolating the charges of the charging signal; detecting a voltage variation in the sensor pattern by a common voltage (Vcom) applied to the common electrode capacitance (Cvcom); and detecting occurrence of a level shift between the voltage variations before and after occurrence of a touch input. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A display device having a built-in capacitive touch detecting device for detecting occurrence of a touch capacitance (Ct) by an approach of a bodily finger or a touch input instrument such as a conductor similar to the bodily finger, wherein the capacitive touch detecting device comprises:
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at least one sensor pattern that forms the touch capacitance (Ct) between the touch input instrument and the sensor pattern, and that is disposed at a distance spaced from a common electrode to thus form a common electrode capacitance (Cvcom); a charging unit that supplies a charge signal to the sensor pattern to thus accumulate charges in the common electrode capacitance (Cvcom); and a level shift detecting unit that is connected to the sensor pattern, and that detects a level shift occurs in a voltage variation in the sensor pattern at the time of occurrence of a touch input, with respect to another voltage variation in the sensor pattern at the time of non-occurrence of a touch input, to thereby acquire a touch signal, wherein the common electrode has a common voltage (Vcom) level that alternates at a predetermined frequency, and wherein the level shift detecting unit detects a level shift between the voltage variations arising from the sensor pattern by the common voltage (Vcom) before and after the occurrence of the touch input. - View Dependent Claims (18, 19, 20)
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Specification