Touch Panel Compensation Pattern Layer Reflectivity

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Solution Overview

Problem

Conventional touch panels suffer from poor visibility due to differences in reflectivity between regions with and without a touch sensing layer, leading to optical interference and unsatisfactory visual effects.

Innovation Solution

A compensation pattern layer is introduced between the substrates, ensuring that the reflectivity difference between regions with and without the touch sensing layer is less than 1%, thereby improving visibility by reducing the contrast between these regions.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a touch sensing layer is added to the substrate, then touch sensing function is improved, but visibility is worsened due to reflectivity difference between regions with and without the touch sensing layer

Engineering Contradiction:

Improvetouch sensing functionVSAvoidvisibility

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent applies local quality by introducing a compensation pattern layer specifically in the region without the touch sensing layer. This layer has different optical properties (reflectivity) compared to the region with the touch sensing layer, thereby compensating for the visual difference and improving overall visibility while maintaining the touch sensing function.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent converts the harmful effect of the reflectivity difference into a benefit by deliberately designing a compensation pattern layer with specific reflectivity characteristics. The reflected light from this compensation layer is used to offset the visual imbalance caused by the touch sensing layer, transforming the optical interference problem into a solution that enhances visibility.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Ease of manufacture

If the substrate structure is made uniform, then manufacturing is simplified, but visibility is worsened because the reflectivity difference cannot be compensated

Engineering Contradiction:

Improvesubstrate structure uniformityVSAvoidvisibility

Core Design Contradiction:

Ease of manufactureVSIllumination intensity

Solution Approach 1:

Instead of making the entire substrate structure uniform, the patent introduces a localized compensation pattern layer in the region without the touch sensing layer. This local modification allows the substrate to maintain simplicity in most areas while providing targeted optical compensation where needed, thus balancing manufacturing ease with visibility improvement.

Inventive Principle:

Principle #3Local quality

3Difficulty of detecting and measuring

If the reflectivity difference between regions is increased, then the touch sensing layer region becomes more distinguishable, but optical interference is worsened and visibility deteriorates

Engineering Contradiction:

Improveregion distinguishabilityVSAvoidoptical interference

Core Design Contradiction:

Difficulty of detecting and measuringVSObject-affected harmful factors

Solution Approach 1:

The patent converts the optical interference caused by reflectivity differences into a beneficial effect. By carefully designing the compensation pattern layer with specific reflectivity, the reflected light from this layer compensates for the visual imbalance, thereby reducing optical interference and improving visibility while maintaining region distinguishability.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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

The implementation of the compensation pattern layer enhances the visibility of touch panels and touch displays by minimizing the reflectivity difference, resolving issues of poor visibility and optical interference, resulting in improved user experience.

Implementation Method 1

the reflectivity r1 and the reflectivity r2 of light L in the respective regions A1 and A2 are also different, which leads to different visual effects

Methodology Applied

Scientific EffectOptical reflection: Reflection

Data Source

PatentUS8970550B2Touch panel and touch display

Publication Date: 2015.03.03 HANNSTAR DISPLAY CORP

AI summary

A touch panel that includes a first substrate, a touch sensing layer, a compensation pattern layer, a second substrate, and a first optical adhesive layer is provided. The touch sensing layer includes a plurality of electrode sets arranged in parallel, and each of the electrode sets includes a scan electrode and a plurality of sensing electrodes. An orthogonal projection of the touch sensing layer on the first substrate is not overlapped with an orthogonal projection of the compensation pattern layer on the first substrate. The compensation pattern layer and the touch sensing layer are located between the first substrate and the second substrate. The first optical adhesive layer is located between the first substrate and the second substrate. A touch display is also provided.