Low Diffusivity Decorative Structure for Touch Sensing Devices

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Solution Overview

Problem

Light-shielding/decorative layers in touch sensing devices with different colors suffer from varying light penetration abilities, leading to a halo effect that reduces the identification ability of virtual function keys, affecting user convenience.

Innovation Solution

A decorative structure comprising a transparent substrate with a low diffusivity material layer (reflectivity < 10%) and a protective layer having opening patterns, allowing light to pass through and reducing light diffusion, thereby preventing the halo effect.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a light-shielding/decorative layer with high light penetration ability is used, then the identification ability of virtual function keys is improved, but light diffusion occurs causing a halo effect that reduces identification ability

Engineering Contradiction:

Improvelight penetration abilityVSAvoidhalo effect

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The patent applies local quality by using a low diffusivity material layer specifically in the non-image display area where virtual function keys are located, while other areas may use different material properties. This localized application ensures that light passes through the virtual function key regions with minimal diffusion, preventing the halo effect and improving key identification without compromising overall decorative functionality

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent changes the physical parameter of light diffusivity by selecting a material with a reflectivity of less than 10% for the low diffusivity material layer. This parameter change directly addresses the halo effect by reducing light scattering in the virtual function key areas, thereby improving identification ability while maintaining appropriate light shielding in other regions

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If a light-shielding/decorative layer with high reflectivity is used, then the halo effect is reduced, but light penetration ability for virtual function key identification is compromised

Engineering Contradiction:

Improvehalo effect mitigationVSAvoidlight penetration ability

Core Design Contradiction:

Object-affected harmful factorsVSIllumination intensity

Solution Approach 1:

The patent precisely controls the reflectivity parameter of the low diffusivity material layer to be less than 10%. This parameter optimization ensures that the material provides sufficient light penetration for virtual function key identification while simultaneously minimizing light diffusion that causes the halo effect, achieving a balanced solution to both requirements

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If different colored light-shielding/decorative layers are used to increase color diversity, then aesthetic design is improved, but light penetration abilities vary causing inconsistent virtual function key identification

Engineering Contradiction:

Improvecolor diversityVSAvoidlight penetration consistency

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent applies local quality by implementing a low diffusivity material layer specifically in the non-image display area where virtual function keys are positioned. This localized approach ensures consistent light penetration and prevents the halo effect in critical areas, regardless of the color or material properties of decorative layers in other regions, thereby maintaining identification consistency across different color variants

Inventive Principle:

Principle #3Local quality

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 solution enhances the identification of virtual function keys by minimizing light diffusion, improving user recognition and operational convenience.

Implementation Method 1

the low diffusivity material layer has a reflectivity of less than 10%

Methodology Applied

Scientific EffectLight reflection: Reflection

Data Source

PatentUS8884902B2Decorative structure for touch sensing device and fabrication method thereof

Publication Date: 2014.11.11 HTC CORP

AI summary

A decorative structure for a touch sensing device is provided. The structure comprises a transparent substrate, a low diffusivity material layer and a protective layer. The transparent substrate has a non-touch surface having a non-image display area. The low diffusivity material layer is disposed on the non-touch surface of the transparent substrate and corresponds to the non-image display area, wherein the low diffusivity material layer has a reflectivity of less than 10%. The protective layer is disposed on the low diffusivity material layer and has at least a first opening pattern to allow a light to sequentially pass through the low diffusivity material layer and the transparent substrate from the first opening pattern.