Touch input device including display module formed with pressure sensing electrode and pressure sensing electrode forming method
First Claim
1. A touch input device capable of detecting a touch pressure, the touch input device comprising:
- a display panel having a pressure electrode which is formed on a back side of the display panel and is for detecting the pressure;
a reference potential layer which is formed separately from the pressure electrode; and
a substrate which is disposed under the display panel and comprises the reference potential layer,wherein the touch input device detects the touch pressure on the basis of a capacitance change amount according to a change of a distance between the pressure electrode and the reference potential layer,wherein when no pressure is applied to the display panel, the distance between the pressure electrode which is formed on the back side of the display panel and the reference potential layer is maintained by a support member disposed only on a circumference of the substrate, andwherein the support member is made of an inelastic material.
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Accused Products
Abstract
A touch input device capable of detecting a touch pressure is provided that includes: a display module having a pressure electrode which is formed on a back side of the display panel and is for detecting the pressure; and a reference potential layer which is formed separately from the pressure electrode. The touch input device detects the touch pressure on the basis of a capacitance change amount according to a change of a distance between the pressure electrode and the reference potential layer. As a result of this, the touch input device becomes thinner, has a reduced manufacturing cost thereof, and detects a touch position and touch pressure without deteriorating the visibility and optical transmittance of the display module.
10 Citations
14 Claims
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1. A touch input device capable of detecting a touch pressure, the touch input device comprising:
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a display panel having a pressure electrode which is formed on a back side of the display panel and is for detecting the pressure; a reference potential layer which is formed separately from the pressure electrode; and a substrate which is disposed under the display panel and comprises the reference potential layer, wherein the touch input device detects the touch pressure on the basis of a capacitance change amount according to a change of a distance between the pressure electrode and the reference potential layer, wherein when no pressure is applied to the display panel, the distance between the pressure electrode which is formed on the back side of the display panel and the reference potential layer is maintained by a support member disposed only on a circumference of the substrate, and wherein the support member is made of an inelastic material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for forming a pressure electrode on a display panel comprising an upper substrate layer made of glass or plastic and a TFT substrate layer made of glass or plastic, and a liquid crystal layer or an organic layer between the upper substrate layer and the TFT substrate layer,
wherein the method comprises: -
forming the pressure electrode for detecting a pressure on a bottom surface of the TFT substrate layer; forming an insulator on the formed pressure electrode; forming a protective layer on the TFT substrate layer in which the pressure electrode and the insulator have been formed; after forming the pressure electrode, the insulator and the protective layer on the TFT substrate layer, inverting the TFT substrate layer; after inverting the TFT substrate layer, forming a liquid crystal layer or an organic layer on a top surface of the inverted lower TFT substrate layer; and after forming the liquid crystal layer or the organic layer on the top surface of the inverted lower TFT substrate layer, forming the upper substrate layer on the liquid crystal layer or the organic layer. - View Dependent Claims (11, 12, 13, 14)
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Specification