Opaque Adhesive Layer for Narrow Bezel Touch Display

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Solution Overview

Problem

Existing touch display devices with narrow bezel designs face challenges in reducing overall thickness due to the folded-back circuit area, leading to increased thickness and potential light leakage.

Innovation Solution

Incorporating an opaque first adhesive layer and protective layers, which are high resistance black ink materials with specific optical densities, to prevent light leakage and reduce device thickness by extending along the side surfaces and lower surfaces of the display module, thereby replacing traditional light leak-proof cell tapes.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If the circuit area is bent back to the back of the liquid crystal module to achieve narrow bezel design, then the bezel width is reduced, but the overall thickness of the touch display device increases

Engineering Contradiction:

Improvebezel widthVSAvoidoverall thickness

Core Design Contradiction:

Area of stationary objectVSLength of stationary object

Solution Approach 1:

The patent extracts the light leak-proof function from traditional cell tapes and integrates it directly into the adhesive layer and protective layer materials. By making these layers opaque through material selection rather than adding separate light-blocking components, the design achieves narrow bezels without increasing thickness.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The adhesive layer and protective layer serve multiple functions simultaneously: they provide structural adhesion, protect the touch sensing film, and prevent light leakage through their opaque properties. This multi-functionality eliminates the need for additional light-blocking layers, maintaining thin profile while achieving narrow bezel design.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If traditional light leak-proof cell tapes are used to prevent light leakage, then light leakage is blocked, but the device thickness increases and manufacturing complexity increases

Engineering Contradiction:

Improvelight leakageVSAvoiddevice thickness

Core Design Contradiction:

Object-affected harmful factorsVSLength of stationary object

Solution Approach 1:

The patent merges the light leak-proof function with the adhesive layer and protective layer by selecting opaque materials for these components. This integration eliminates separate light-blocking layers, reducing overall device thickness while maintaining effective light leakage prevention.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent uses standard opaque adhesive layers and protective layers with optical density ≥4.5, which are readily available materials. This approach simplifies manufacturing by using common materials rather than specialized light-blocking components, reducing both complexity and cost.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

3Object-affected harmful factors

If traditional light leak-proof cell tapes are used to prevent light leakage, then light leakage is blocked, but manufacturing process complexity and production costs increase

Engineering Contradiction:

Improvelight leakageVSAvoidmanufacturing complexity

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The light leak-proof function is merged into the adhesive layer and protective layer, which are already required for structural purposes. This eliminates the need for separate light-blocking material application steps, simplifying the manufacturing process while maintaining light leakage prevention.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent specifies that the adhesive layer and protective layer should have optical density ≥4.5, transforming the material selection criterion to achieve light leakage prevention. This parameter-based approach allows use of standard opaque materials, simplifying manufacturing compared to specialized light-blocking materials.

Inventive Principle:

Principle #35Parameter changes

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 effectively reduces the overall thickness of the touch display device, achieves narrow bezel designs, and prevents light leakage, making the device thinner and lighter while simplifying manufacturing processes and reducing production costs.

Implementation Method 1

at least one of the first adhesive layer disposed on the side surface of the display module or the protective layer is an opaque material

Methodology Applied

Scientific EffectLight absorption: Absorption (EM radiation)

Data Source

PatentUS11454839B2Touch display device comprising adhesive layer or protective layer that is opaque material for preventing light leakage

Publication Date: 2022.09.27 TPK ADVANCED SOLUTIONS

AI summary

A touch display device for preventing light leakage is provided, including a display module, a first adhesive layer, a touch sensing film, and at least one protective layer. The display module includes an upper surface, a side surface, and a lower surface. The first adhesive layer is disposed on the upper surface of the display module and is bent and extends along the side surface to the lower surface, and the touch sensing film is disposed on the first adhesive layer. The at least one protective layer is disposed on one side of the touch sensing film relative to the side surface and the lower surface of the display module. At least one of the first adhesive layer disposed on the side surface of the display module or the protective layer is an opaque material, so the thickness of the device can be reduced.