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Touch input sensing device

A technology of touch sensing and touch sensor, which is applied in the field of capacitive sensing devices, and can solve the problems of affecting touch accuracy, insufficient protection of conductive films, and reduction of coating quality, etc.

Inactive Publication Date: 2006-11-15
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the thin dielectric coating is very thin, usually no more than one micron in thickness, which results in insufficient protection of the conductive film from damage caused, for example, by sharp touching tools
Thicker dielectric coatings increase manufacturing costs and often degrade coating quality by introducing stress-induced cracks and surface defects into the coating
Also, wear of the thin dielectric coating under normal use can cause variations in the thickness of the thin dielectric coating
This variation affects touch accuracy and can cause annoying visible surface defects

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0069] A touch sensor according to one embodiment of the present invention is assembled as follows.

[0070] A 3 mm thick soda lime glass substrate was dip coated in a solution which may contain an organic conductive material commercially available from Baytron P under the trademark Baytron P. The solution also includes ethylene glycol and epoxy silane coupling agents. The solution was diluted with isopropanol. Both sides of the glass substrate were coated by dipping treatment. The coated glass substrate was dried and cured at 85° C. for 6 minutes, thereby obtaining a conductive polymer film formed on both sides of the glass substrate.

[0071] Next, along the perimeter of one side of the panel, a linearization structure was screen printed using carbonized conductive ink. The printed substrates were cured at 130°C for 6 minutes.

[0072] Next, use conductive epoxy to electrically connect wires to the four corners of the linearization structure. The assembly was cured at 1...

example 2

[0077] A touch sensor according to one embodiment of the present invention was prepared similarly to Example 1, except that a 0.4 mm thick soda lime glass substrate was used for dip coating. Use the Controller EX II to activate the finished assembly. The results of the finger-drawing test were linear better than 1%.

example 3

[0079] A touch sensor according to one embodiment of the present invention is assembled as follows.

[0080] Linearization structures were screen printed along the perimeter on one side of a 3 mm thick soda lime glass substrate and coated with 1500 ohms / unit area of ​​TAO on the same side. The conductive ink used to print the linearization structures was from DuPont under the trade mark 7713. The printed substrates were cured at 500°C for 15 minutes.

[0081] Next, wires were connected to the four corners of the linear structure similarly to Example 1.

[0082] Next, 0.4 mm thick soda lime glass was glued to this side of the panel printed with the linearized structure. Bonding was accomplished using an optical adhesive from Norland Corporation under the trade mark NOA 68. The adhesive is cured using ultraviolet light.

[0083] Next, activate the finished assembly using the EX II controller connected to the wires. The results of the finger-drawing test were linear better t...

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PUM

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Abstract

A touch sensor and a method of sensing are disclosed. The touch sensor includes a self-supporting flexible glass layer disposed on a conductive film. The touch sensor further includes electrical circuitry configured to detect a signal induced by capacitive coupling between the conductive film and a touch input applied to the flexible glass layer.

Description

technical field [0001] The present invention relates to sensing devices. The invention is particularly applicable to capacitive sensing devices. Background technique [0002] Touch screens allow users to easily interface with electronic display systems by reducing or eliminating the user's need for a keyboard. For example, a user can execute a complex sequence of instructions simply by touching the screen at a location indicated by a pre-programmed icon. The on-screen menus can be changed according to the application by reprogramming the supporting software. As another example, a touch screen may allow a user to transfer text or drawings to an electronic display device by writing or drawing directly on the touch screen. [0003] Resistive and capacitive techniques are two common touch sensing methods used to detect the location of a touch input. Resistive technology typically incorporates two transparent conductive films as part of the circuitry used to detect the locati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F3/033G06F3/044G06F3/048
CPCG06F3/0443G06F3/0416
Inventor 保罗·J·里克特达兰·R·凯恩斯弗兰克·J·博塔里
Owner 3M INNOVATIVE PROPERTIES CO
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