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Resistant touch screen with variable resistance layer

A touch screen, resistive technology, applied in the field of forming a resistive layer, can solve the problems of high cost, high temperature, and high cost of silver ink, and achieve the effects of large effective area, cost reduction, and simple manufacturing.

Inactive Publication Date: 2004-09-22
EASTMAN KODAK CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

First, silver inks are costly, and the method of screen printing silver inks is expensive due to the additional manufacturing steps and materials required
Second, silver inks do not bond well to conductive layers unless carefully prepared and printed
In addition, the method of bonding the ink to the conductive layer requires high temperatures, creating many problems for touch screens and related display systems

Method used

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  • Resistant touch screen with variable resistance layer
  • Resistant touch screen with variable resistance layer
  • Resistant touch screen with variable resistance layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0018] refer to figure 1 , by using a variable conduction layer 32 disposed on the substrate 12 to overcome the problems of prior art touch screens. The flexible transparent cover sheet 16 having the second conductive layer 34 is separated from the variable conductive layer 32 by conventional means such as isolation points 20 . The conductivity of the conductive layer 32 disposed on the substrate 12 and / or the conductive layer 34 disposed on the flexible transparent cover sheet 16 is variable.

[0019] The change in conductivity of variable conduction layers 32 and / or 34 may be continuous or discontinuous. If the conductivity of the layer is continuous, the sheet resistance of the layer varies continuously and gradually between locations within the layer. If the conductivity of the layer is discontinuous, a particular location within the layer will have a significantly different conductivity than nearby locations.

[0020] In the prior art touch screen, the sheet resistance...

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PUM

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Abstract

A resistive touch screen includes a transparent substrate defining a touch area; a first layer of conductive material formed on the transparent substrate and extending over the touch area; an electrical connection to the first layer of conductive material; a transparent flexible cover sheet; a second layer of conductive material formed on the transparent flexible cover sheet, the cover sheet being mounted in a spaced apart relationship from the substrate, whereby a touch in the touch area results in an a electrical contact between the first and second layers of conductive material at the point of touch; an electrical connection to the second layer of conductive material; and at least one of the first or second layers of conductive material having a variable conductivity.

Description

technical field [0001] The present invention relates to resistive touch screens, and more particularly the present invention relates to forming a resistive layer within a resistive touch screen. Background technique [0002] Resistive touch screens are widely used in conventional CRTs and flat panel display devices for computers and especially portable computers. 2 and 3 illustrate a portion of a prior art four-wire resistive touch screen 10 comprising a transparent substrate 12 having a first conductive layer 14 defining a touch area. The conductive layer typically comprises indium tin oxide (ITO) or a conductive polymer such as polythiophene. The flexible transparent cover sheet 16 includes a second conductive layer 18 physically separated from the first conductive layer by a separation point 20 . Conductive patterns 30 having a resistance lower than that of the conductive layer 14 and defining edge regions are disposed on the conductive layer 14 at opposite edges of the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/045G06F3/033G06F3/041
CPCG06F3/045G06F2203/04103
Inventor R·S·科克
Owner EASTMAN KODAK CO
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