Flexible Display Coated Layers for Driver Chip Bonding

Solution Overview

Problem

Flexible display devices face challenges in achieving strong and reliable bonding of driver chips due to variations in the physical properties of compensation members, leading to potential poor adhesion and mechanical stress during bending.

Innovation Solution

The implementation of a display device with distinct coated layers on different regions, where the second coated layer has a higher modulus than the first, utilizing materials like acrylic organic materials, polycarbonate, or metal oxides, to enhance the rigidity and support for driver chip attachment, and anisotropic conductive films for secure bonding.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If compensation members with uniform physical properties are used throughout the display member, then manufacturing simplicity is maintained, but bonding reliability of the driver chip deteriorates due to inadequate support in bending regions

Engineering Contradiction:

Improvebonding reliabilityVSAvoidcoated layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by differentiating the coated layer structure between flat and bending regions. The bending region includes a first coated layer with first physical properties, while the flat region includes a second coated layer with second physical properties. This localized differentiation ensures that each region has the appropriate mechanical characteristics for its function, improving driver chip bonding reliability without requiring complex structures throughout the entire display member.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the coated layer structure into distinct regions based on the underlying display member geometry. The compensation member is divided into a first region corresponding to the bending region and a second region corresponding to the flat region, with each region having different coated layers. This segmentation allows optimized bonding performance in each region while maintaining overall manufacturing feasibility.

Inventive Principle:

Principle #1Segmentation

2Adaptability or versatility

If the display member is made highly flexible to enable bending, then adaptability is improved, but bonding strength of the driver chip deteriorates due to mechanical stress during bending

Engineering Contradiction:

Improvebending capabilityVSAvoidbonding strength

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The patent implements local quality by providing different coated layers in bending and flat regions. The first coated layer in the bending region has physical properties optimized for flexibility and stress distribution, while the second coated layer in the flat region has properties optimized for bonding strength. This allows the display member to maintain adaptability for bending while ensuring bonding strength is preserved through localized structural optimization.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The first coated layer in the bending region acts as a cushioning layer that absorbs and distributes mechanical stress before it reaches the driver chip bonding interface. This beforehand cushioning prevents stress concentration that would otherwise compromise bonding strength during bending operations, allowing the display member to remain highly flexible while maintaining reliable bonds.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Manufacturing precision

If a single coated layer is used across the entire display member, then manufacturing process simplicity is maintained, but bonding uniformity deteriorates due to varying mechanical stresses in different regions

Engineering Contradiction:

Improvebonding uniformityVSAvoidcoating process complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent applies local quality by differentiating the coated layer structure between flat and bending regions. The bending region includes a first coated layer with first physical properties, while the flat region includes a second coated layer with second physical properties. This localized differentiation ensures that each region has the appropriate mechanical characteristics for its function, improving driver chip bonding reliability without requiring complex structures throughout the entire display member.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The patent segments the coated layer structure into distinct regions based on the underlying display member geometry. The compensation member is divided into a first region corresponding to the bending region and a second region corresponding to the flat region, with each region having different coated layers. This segmentation allows optimized bonding performance in each region while maintaining overall manufacturing feasibility.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS12092795B2Display device and method of manufacturing the same

Publication Date: 2024.09.17 SAMSUNG DISPLAY CO LTD

AI summary

A display device includes: a display member including a first region, a second region, and a third region defined between the first region and the second region; a first coated layer disposed on a first surface of the first region of the display member; and a second coated layer disposed on a first surface of the second region of the display member, where a first modulus of the first coated layer is smaller than a second modulus of the second coated layer.