Flexible Display Bonding Layer Misalignment Compensation

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Solution Overview

Problem

Conventional flexible display devices experience misalignment of backplanes after the bending process, resulting in poor bending arc shapes and reduced product quality.

Innovation Solution

A flexible display design featuring a bonding layer with multiple adhesive layers, including a thermosensitive or photosensitive second adhesive layer, allows for misalignment compensation by adjusting the position of the bonding section relative to the backplane, ensuring a better bending arc shape and improved product quality.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If a single-layer adhesive bonding layer is used to connect the bonding section to the backplane, then the manufacturing process is simple, but misalignment occurs after bending resulting in poor bending arc shape

Engineering Contradiction:

Improvealignment precisionVSAvoidbonding layer structure

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The bonding layer is divided into multiple adhesive layers (first adhesive layer, second adhesive layer, and third adhesive layer) with different functions. The first and third layers provide initial bonding, while the second layer allows for position adjustment during bending, thereby improving alignment precision without requiring a completely complex new structure.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The second adhesive layer is designed to be uncured during the natural environment and bending process, providing fluidity that enables the bonding section to be adjusted to the correct position. After bending, this layer is cured to fix the adjusted position, thus achieving good bending arc shape through dynamic adjustment capability.

Inventive Principle:

Principle #15Dynamics

2Shape

If the bonding section is rigidly fixed to the backplane before bending, then the structure is stable, but the bending arc shape deteriorates due to misalignment

Engineering Contradiction:

Improvebending arc shapeVSAvoidbonding stability

Core Design Contradiction:

ShapeVSStability of the object's composition

Solution Approach 1:

The first and third adhesive layers are applied to provide preliminary bonding between the bonding section and backplane. This preliminary bonding maintains stability during handling while allowing the second layer to enable position adjustment during the bending process, thus achieving both stability and good bending arc shape.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The bonding system transitions from a static rigid fixation to a dynamic system where the second adhesive layer remains uncured during bending, allowing the bonding section to move and adjust its position. After bending is complete, the second layer is cured to achieve stable fixation with proper alignment, thus resolving the contradiction between stability and bending arc quality.

Inventive Principle:

Principle #15Dynamics

3Manufacturing precision

If conventional adhesive bonding is used, then the manufacturing process is simple, but misalignment compensation is not possible resulting in reduced product quality

Engineering Contradiction:

Improvealignment accuracyVSAvoidbonding process complexity

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent changes the chemical state parameter of the second adhesive layer, keeping it uncured during the bending and alignment process to enable position adjustment. After alignment is achieved, the second layer is cured to fix the position. This parameter change (from uncured to cured state) enables misalignment compensation without significantly complicating the manufacturing process.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of using complex mechanical alignment systems or adjustable fixtures, the patent substitutes a chemical approach by using the uncured state of the second adhesive layer to enable position adjustment. This replaces complex mechanical alignment mechanisms with a simpler chemical-based adjustment method, maintaining ease of manufacture while improving alignment accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 use of a multi-layer adhesive bonding layer with thermosensitive or photosensitive properties enables accurate alignment and adherence of the bonding section to the backplane, enhancing the bending arc shape and overall product quality by allowing for positional adjustments during the bonding process.

Implementation Method 1

the second adhesive layer includes a thermosensitive adhesive layer or a photosensitive adhesive layer

Methodology Applied

Scientific EffectThermosensitive adhesive:

Implementation Method 2

the second adhesive layer includes a thermosensitive adhesive layer or a photosensitive adhesive layer

Methodology Applied

Scientific EffectPhotosensitive adhesive: Photopolymerisation

Data Source

PatentUS11250735B2Flexible display

Publication Date: 2022.02.15 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD

AI summary

A flexible display is provided and includes a flexible panel and a backplane disposed on the flexible panel. The flexible panel includes a display section, a bonding section, and a bending section between the display section and the bonding section. The bonding section is connected to the backplane through a bonding layer in response to the bending section being bent and the bonding section reaching a back side of the backplane. The bonding layer includes at least three layers of adhesive layers.