Touch Sensing Display Panel with Ring Electrodes

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Solution Overview

Problem

Conventional capacitive touch sensing display panels face issues with transmittance uniformity and visual effect due to inconsistent fabrication processes of their electrode series, leading to decreased performance.

Innovation Solution

The implementation of a touch sensing display panel design featuring inner and outer ring electrodes on a substrate, with floating electrodes surrounding the electrode series, fabricated using the same thin film deposition process to enhance transmittance and visual uniformity, and reduce crosstalk between electrodes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If different thin film deposition processes are used for first electrode series and second electrode series, then the touch sensing function is achieved, but transmittance uniformity deteriorates

Engineering Contradiction:

Improvetouch sensing functionVSAvoidtransmittance uniformity

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent merges the fabrication processes of the first and second electrode series by using the same thin film deposition process for both electrode types. This unification eliminates the transmittance inconsistency that arises from separate fabrication processes, while still maintaining the functional distinction between driving and sensing electrodes through their geometric arrangements (inner ring vs. outer ring configurations).

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent applies local quality by creating different geometric configurations (inner ring electrodes vs. outer ring electrodes) of the same material layer deposited in a single process. The inner ring electrodes serve as driving electrodes while outer ring electrodes serve as sensing electrodes, achieving functional differentiation through local structural variation rather than material or process differentiation.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If multiple separate electrode series are fabricated using different processes, then sensing and driving functions are achieved, but manufacturing complexity increases

Engineering Contradiction:

Improvesensing and driving functionsVSAvoidmanufacturing process complexity

Core Design Contradiction:

Adaptability or versatilityVSDevice complexity

Solution Approach 1:

The patent combines multiple electrode series into a single integrated structure fabricated through one thin film deposition process. The first and second electrode series are formed simultaneously in the same process, reducing manufacturing complexity while maintaining the ability to perform both sensing and driving functions through their spatial relationships and electrical connections.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent creates a multi-functional electrode structure where a single deposited layer serves multiple purposes: inner ring portions function as driving electrodes while outer ring portions function as sensing electrodes. This universal structure eliminates the need for separate fabrication processes for different functional electrodes.

Inventive Principle:

Principle #6Universality (Multi-functionality)

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This design improves overall light transmittance and visual effect while promoting manipulation sensitivity by ensuring uniform transmittance and reducing crosstalk between adjacent electrodes.

Implementation Method 1

The inner electrode series and the outer electrode series are fabricated by using the same thin film deposition process

Methodology Applied

Scientific EffectThin film deposition: Physical Vapour Deposition

Implementation Method 2

When a person touches the mutual capacitive touch sensing display panel 100 with a finger, the parasitic capacitance of the finger and the parasitic capacitance of the touched sensing electrode are equivalently connected in series to each other, which results in changing the capacitance between the first electrode 142 and the second electrode 152

Methodology Applied

Scientific EffectCapacitance: Capacitance

Implementation Method 3

FIG. 1C is a diagram showing the usual electric field lines generated by an electrode

Methodology Applied

Scientific EffectElectric field: Electric Field

Data Source

PatentUS8269743B2Touch sensing display panel and touch sensing substrate

Publication Date: 2012.09.18 AU OPTRONICS CORP

AI summary

A touch sensing display panel includes an active device array substrate, an opposite substrate, a display medium layer, a plurality of inner and outer electrode series. The opposite substrate is disposed over the active device array substrate and the display medium layer is disposed between the active device array substrate and the opposite substrate. The inner electrode series are disposed on the opposite substrate and extend along a first direction, wherein each inner electrode series includes inner ring electrodes electrically connected to each other. The outer electrode series are disposed on the opposite substrate and extend along a second direction, wherein each outer electrode series includes outer ring electrodes electrically connected to each other. Each inner ring electrodes is respectively surrounded by one of the outer ring electrodes, and the first direction is substantially perpendicular to the second direction. The present invention also provides a touch sensing substrate.