Liquid crystal display device having touch panel function and method for detecting a touch position
First Claim
1. A liquid crystal display (LCD) device comprising:
- a first substrate;
a second substrate supported in spaced apart relationship with the first substrate;
a liquid crystal layer interposed between the first substrate and the second substrate, wherein the second substrate comprises a sensing array adapted to sense a voltage change in accordance with a change in a thickness of the liquid crystal layer responsive to a touch of the LCD; and
a sensing controlling section adapted to identify a location of a position touched by comparing an initial reference voltage corresponding to an initial thickness of the liquid crystal layer when the LCD is not touched, wherein the initial reference voltage changes as a function of temperature with a difference voltage that corresponds to a difference between the sensing voltage and the initial reference voltage.
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Abstract
A liquid crystal display (LCD) device includes a first substrate, a second substrate spaced apart from the first substrate and a liquid crystal layer interposed between the substrates. A sensing controlling section is also included in the LCD device. The second substrate includes a sensing array that senses a change in a sensing voltage responsive to a change in a thickness of the liquid crystal layer. The sensing controlling section detects a touch position data by comparing a reference voltage that changes according to a change in temperature with a variation voltage that corresponds to a difference between the sensing voltage and an initial voltage corresponding to an initial thickness of the untouched liquid crystal layer.
112 Citations
10 Claims
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1. A liquid crystal display (LCD) device comprising:
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a first substrate; a second substrate supported in spaced apart relationship with the first substrate; a liquid crystal layer interposed between the first substrate and the second substrate, wherein the second substrate comprises a sensing array adapted to sense a voltage change in accordance with a change in a thickness of the liquid crystal layer responsive to a touch of the LCD; and a sensing controlling section adapted to identify a location of a position touched by comparing an initial reference voltage corresponding to an initial thickness of the liquid crystal layer when the LCD is not touched, wherein the initial reference voltage changes as a function of temperature with a difference voltage that corresponds to a difference between the sensing voltage and the initial reference voltage. - View Dependent Claims (2, 3, 4, 5)
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6. A method of detecting a touch position of a liquid crystal display (LCD) panel having an array substrate, an opposing substrate, and a liquid crystal layer interposed between the array and opposing substrates, the method comprising:
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detecting a sensing voltage changing in accordance with a thickness variation of the liquid crystal layer, which is induced by compression of external sides of the array substrate and opposing substrate when the LCD panel is touched; comparing the sensing voltage with an initial reference voltage corresponding to an initial thickness of the liquid crystal layer to extract a change in voltage; comparing an initial reference voltage when the LCD panel is not touched, and that changes according to temperature change, with the sensed change in voltage to determine whether the LCD panel is touched or not; and detecting a touch position location by using the sensing voltage when the LCD panel is touched. - View Dependent Claims (7, 8, 9, 10)
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Specification