Flexible Display Assembly Bonding Alignment

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Solution Overview

Problem

Flexible OLED display panels face challenges in precise bonding due to deformation caused by the elastic backing film and the flexible display panel during the bonding process, leading to misalignment of bonding contacts and potential failure in IC chip control.

Innovation Solution

A display assembly is designed with a flexible display panel having a stretchable display area, a breakable area, and a bonding area, supported by a first support film with greater elongation and lower hardness, and a second support film with lesser elongation and higher hardness, which are lapped to each other to maintain precise alignment and prevent breakage.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a single elastic backing film is used to support the flexible display panel, then the panel can be supported and protected, but deformation occurs during bonding causing misalignment of bonding contacts

Engineering Contradiction:

Improvebonding precisionVSAvoidpanel deformation

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The support film is divided into two distinct segments: a first support film with high elasticity for the stretchable display area, and a second support film with high hardness for the bonding area. This segmentation allows each segment to perform its specific function independently, preventing deformation during bonding while maintaining flexibility in the display area.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the support structure are assigned different material properties: the first support film has high elongation (≥20%) to accommodate stretching, while the second support film has high hardness to prevent deformation during bonding. This local differentiation of material properties resolves the contradiction between flexibility and bonding precision.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the support film has high elongation to accommodate stretching, then flexibility is improved, but hardness is reduced causing deformation during bonding

Engineering Contradiction:

Improvestretching capabilityVSAvoidresistance to deformation

Core Design Contradiction:

Adaptability or versatilityVSStrength

Solution Approach 1:

The support function is segmented between two films: the first support film provides stretching capability with high elongation, while the second support film provides deformation resistance with high hardness. This segmentation allows both contradictory requirements to be satisfied in different regions.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The support structure uses a composite of two different film materials with complementary properties. The first support film is made of highly elastic material for stretching, while the second support film is made of hard material for bonding stability, creating a composite system that satisfies both requirements.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS12292764B2Display assembly and display device

Publication Date: 2025.05.06 BOE TECHNOLOGY GROUP CO LTD

AI summary

Provided are a display assembly and a display device. The display assembly includes a flexible display panel comprising a stretchable display area, a breakable area and a bonding area connected in sequence; a first support film on a side of the stretchable display area; and a second support film on a side of the bonding area, the second support film and the first support film being on a same side of the flexible display panel. An elongation of the first support film is greater than an elongation of the second support film, and a hardness of the first support film is less than a hardness of the second support film.