Link Line Display Apparatus Bending Reliability

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Solution Overview

Problem

The existing display apparatus manufacturing process using a laser lift-off process is prone to defects and increases costs, and there is a need for a method to minimize the bezel area while improving reliability and eliminating the laser release process.

Innovation Solution

A display apparatus structure is developed without the laser release process, featuring a first and second glass substrate, an anti-etching member, and a link line portion, with a planarization layer and micro coating layer to enhance bending reliability and reduce bezel width, allowing for improved luminance and residual image characteristics.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a laser lift-off process is applied to a display apparatus with a conventional glass substrate, then the glass substrate can be released, but defects occur and manufacturing cost increases

Engineering Contradiction:

Improveglass substrate releaseVSAvoiddefect rate

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent extracts and eliminates the laser lift-off process from the manufacturing sequence by designing a glass substrate that can be released through alternative means (chemical etching or mechanical breaking), thereby removing the source of defects and cost increases while maintaining the essential function of substrate release

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent employs a sacrificial layer (such as a release coating or temporary bonding layer) that is intentionally designed to be removed easily and inexpensively, replacing the expensive and defect-prone laser lift-off process with a disposable intermediate element that facilitates substrate release through simpler, more reliable methods

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Ease of manufacture

If a laser lift-off process is applied to a display apparatus with a conventional glass substrate, then the glass substrate can be released, but manufacturing cost increases

Engineering Contradiction:

Improveglass substrate releaseVSAvoidmanufacturing cost

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent removes the laser lift-off process from the manufacturing flow and replaces it with cost-effective alternatives such as chemical etching or mechanical breaking, thereby reducing manufacturing costs while maintaining the ability to release the glass substrate

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent substitutes the expensive laser-based mechanical/thermal release system with simpler, more economical methods such as chemical etching or mechanical breaking, replacing high-cost technology with lower-cost alternatives that achieve the same functional outcome of substrate release

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Adaptability or versatility

If a flexible substrate is arranged in the display area, then the structure may be more flexible, but luminance and residual image characteristics deteriorate

Engineering Contradiction:

ImproveflexibilityVSAvoidluminance

Core Design Contradiction:

Adaptability or versatilityVSIllumination intensity

Solution Approach 1:

The patent extracts the flexible substrate from the display area and confines it to the non-display area, eliminating the negative impact on luminance and residual image characteristics while preserving the necessary flexibility for the display apparatus through alternative structural designs

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent applies different substrate properties to different areas: the display area uses a rigid substrate optimized for optical performance (luminance and residual image characteristics), while the non-display area uses a flexible substrate to provide necessary flexibility, thereby achieving local optimization of both optical quality and mechanical adaptability

Inventive Principle:

Principle #3Local quality

4Adaptability or versatility

If a flexible substrate is arranged in the display area, then the structure may be more flexible, but residual image characteristics deteriorate

Engineering Contradiction:

ImproveflexibilityVSAvoidresidual image characteristics

Core Design Contradiction:

Adaptability or versatilityVSStability of the object's composition

Solution Approach 1:

The patent removes the flexible substrate from the display area where it causes residual image problems, confining its presence to the non-display area, thereby eliminating the degradation of residual image characteristics while maintaining overall device flexibility through other means

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent implements spatially differentiated substrate properties: the display area employs a rigid substrate that ensures stable residual image characteristics, while the non-display area utilizes a flexible substrate to provide mechanical adaptability, achieving local optimization of both stability and flexibility

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11538895B2Display apparatus including link line portion

Publication Date: 2022.12.27 LG DISPLAY CO LTD

AI summary

A display apparatus includes a display area, a non-display area surrounding the display area, and a bending area formed in at least one side of the non-display area. The display apparatus includes a first glass substrate provided in the display area, a second glass substrate provided in the non-display area, an anti-etching member provided to overlap the bending area, and a link line portion formed on the anti-etching member and formed to overlap the non-display area.