Foldable Display Adhesive Layer With Local UV Shielding

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Solution Overview

Problem

Foldable display apparatuses face challenges in achieving reduced thickness and improved folding properties due to the inclusion of light-shielding layers and protective substrates, which increase thickness and affect aesthetic quality.

Innovation Solution

A foldable display apparatus with a partially colored adhesive layer containing an irreversible photochromic pigment or dye, replacing the light-shielding layer, is developed, ensuring a reduction in thickness and improved folding capabilities by omitting the need for additional layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a light-shielding layer and protective substrate are included in the foldable display apparatus, then the structural integrity and UV protection are improved, but the thickness increases and folding properties deteriorate

Engineering Contradiction:

Improvestructural integrityVSAvoidthickness

Core Design Contradiction:

ReliabilityVSLength of moving object

Solution Approach 1:

The patent combines the light-shielding function and adhesive function into a single adhesive layer. The adhesive layer contains UV absorbers that provide light-shielding protection while maintaining the required adhesive properties, thereby eliminating the need for a separate light-shielding layer and reducing overall thickness.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The adhesive layer is designed to perform multiple functions simultaneously: it provides adhesion between the polarizing plate and cover window, shields against UV radiation through incorporated UV absorbers, and maintains the required mechanical properties. This multi-functionality eliminates the need for separate protective layers.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Object-affected harmful factors

If a light-shielding layer is included in the foldable display apparatus, then UV protection is improved, but the number of layers and manufacturing complexity increase

Engineering Contradiction:

ImproveUV protectionVSAvoidnumber of layers

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent merges the light-shielding layer and adhesive layer into a single integrated adhesive layer. UV absorbers are incorporated into the adhesive composition, allowing the adhesive layer to provide both adhesion and UV protection functions, thereby reducing the total number of layers.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

Inventive Principle:

Principle #6Universality (Multi-functionality)

3Illumination intensity

If the adhesive layer is made transparent throughout, then the display area aesthetics are improved, but the non-display area lacks sufficient UV protection and light shielding

Engineering Contradiction:

Improvedisplay area transparencyVSAvoidUV protection in non-display area

Core Design Contradiction:

Illumination intensityVSObject-affected harmful factors

Solution Approach 1:

The adhesive layer has different optical properties in different regions: it is transparent in the display area to maintain aesthetics and visibility, and contains UV absorbers in the non-display area to provide adequate UV protection and light shielding where needed.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The adhesive layer exhibits different optical characteristics in different regions - transparent in the display area and colored (due to UV absorbers) in the non-display area. This selective optical property distribution allows both aesthetic requirements and protective requirements to be satisfied simultaneously.

Inventive Principle:

Principle #32Color 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 results in a thinner foldable display apparatus with enhanced folding properties, reduced manufacturing complexity, and cost, while preventing ultraviolet-induced color changes and maintaining aesthetic appeal.

Implementation Method 1

the adhesive composition containing an irreversible photochromic pigment or an irreversible photochromic dye that is discolored irreversibly because of the irradiation of ultraviolet rays

Methodology Applied

Scientific EffectPhotochromism: Photochromism

Implementation Method 2

curing the adhesive composition using heat to form a transparent adhesive layer

Methodology Applied

Scientific EffectCuring:

Data Source

PatentUS12546914B2Foldable display apparatus and manufacturing method of adhesive layer of the same

Publication Date: 2026.02.10 LG DISPLAY CO LTD

AI summary

A foldable display apparatus and a manufacturing method of an adhesive layer of the same are disclosed. A foldable display apparatus in the embodiments of the present disclosure includes a display panel, a polarizing plate being disposed on the display panel, a cover window being disposed on the polarizing plate, and an adhesive layer being disposed between the polarizing plate and the cover window, wherein the adhesive layer comprises a transparent part being disposed in a position corresponding to a display area of the display panel, and a colored part being disposed in a position corresponding to a non-display area of the display panel.