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Charge dissipation ESR (Enhanced Specular Reflector)

IP.com Disclosure Number: IPCOM000246618D
Publication Date: 2016-Jun-21
Document File: 2 page(s) / 210K

Publishing Venue

The IP.com Prior Art Database

Abstract

One of the potential mechanisms for malfunctions for touch sensing displays is false sensing of touch signal when no touch has occurred. This malfunction may be attributed to so-called 'Ghost Noise' which arises from electronic noise from outside of the LCD (Liquid Crystal Display) panel for an in-cell touch display. One way LCD panel manufacturers can resolve this problem requires addition of either a vacuum deposited ITO (Indium Tin Oxide) layer or ITO coated film layer to the bottom side of LCD panel. The conductive layer helps to make the touch signal more immune to false sensing signals. The downside, however, of adding the conductive ITO layer is that is requires an additional process step with associated additions to cost as well as a decrease in total luminance (i.e. by reduced transmittance). An alternative is proposed in which a reflector layer with conductive or dissipative properties can provide an effective electronic shield to block the electronic noise which causes the false touch signals.

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Page 01 of 2


1. Title : Charge dissipation ESR (Enhanced Specular Reflector)


2. Purpose :

One of the potential mechanisms for malfunctions for touch sensing displays is false sensing of touch signal when no touch has occurred. This malfunction may be attributed to so-called 'Ghost Noise' which arises from electronic noise from outside of the LCD (Liquid Crystal Display) panel for an in-cell touch display. One way LCD panel manufacturers can resolve this problem requires addition of either a vacuum deposited ITO (Indium Tin Oxide) layer or ITO coated film layer to the bottom side of LCD panel. The conductive layer helps to make the touch signal more immune to false sensing signals.

The downside, however, of adding the conductive ITO layer is that is requires an additional process step with associated additions to cost as well as a decrease in total luminance (i.e. by reduced transmittance). An alternative is proposed in which a reflector layer with conductive or dissipative properties can provide an effective electronic shield to block the electronic noise which causes the false touch signals.


3. Structure:

Three concepts have been contemplated and shown in the figures below.

Concept I: Conductive or dissipative layer and insulation layer on anti-reflective side of reflector

Concept II : Conductive or dissipative layer on reflective side of reflector

Concept III : Lamination on non-reflective side of reflector


Page 02 of 2


4. Test Result

To explore whether the conductive addi...