Electrical touch sensor and human interface device using the same
First Claim
1. An electrical touch sensor comprising:
- a touch detection part having at least one touch pad and generating a first signal having a same delay time regardless of whether an object is in contact with the touch pad and a second signal having a varied delay time according to whether the object is in contact with the touch pad; and
a contact signal generator generating a contact signal in response to a delay time-difference between the first and second signals.
2 Assignments
0 Petitions
Accused Products
Abstract
An electrical touch sensor is provided. The electrical touch sensor includes: a touch detection part having at least one touch pad and generating a first signal having a same delay time regardless of whether the object is in contact with the touch pad and a second signal having a varied delay time according to whether the object is in contact with the touch pad; and a contact signal generator generating a contact signal in response to the delay time-difference between the first and second signals.
Therefore, it is possible to increase operation reliability by precisely determining whether the object is in contact with the pad, when the object has charge accumulation characteristics more than a certain level, although its conductive is insufficient. In addition, the electrical touch sensor can determine whether the object is in contact with the pad using only one pad to reduce a layout area of a product.
15 Citations
23 Claims
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1. An electrical touch sensor comprising:
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a touch detection part having at least one touch pad and generating a first signal having a same delay time regardless of whether an object is in contact with the touch pad and a second signal having a varied delay time according to whether the object is in contact with the touch pad; and a contact signal generator generating a contact signal in response to a delay time-difference between the first and second signals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A human interface device comprising:
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at least one electrical touch sensor having a touch pad and generating a contact signal depending on whether an object is in contact with the touch pad; and a controller performing a control operation in response to the contact signal, wherein the at least one electrical touch sensor comprises; a touch detection part having at least one touch pad and changing a delay time-difference between first and second signals depending on whether the object is in contact with the touch pad; and a contact signal generator generating a contact signal in response to the delay time-difference between the first and second signals. - View Dependent Claims (20, 21, 22, 23)
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Specification