Flexible Display Terminal Wiring Recess Structure

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Solution Overview

Problem

Bendable display devices face disconnection issues due to the breaking of insulating layers when bent, leading to reliability concerns, as the insulating layers are relatively hard and prone to fracture at small radii of curvature.

Innovation Solution

The solution involves forming a display device with a display area and a driving circuit area that remains flat, while only the terminal area is made bendable. This is achieved by removing certain thin film transistor and interlayer insulating film layers in the bending area to create a recess, where terminal wirings are arranged in a specific pattern with a metal island shape at the corner, reducing stress on the insulating layers and preventing disconnection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the insulating layers are made thicker or more numerous to ensure electrical insulation, then the insulation performance is improved, but the layers become more prone to breaking when bent

Engineering Contradiction:

Improveelectrical insulation performanceVSAvoidresistance to breaking during bending

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The insulating layer is divided into multiple segments: a first insulating layer and a second insulating layer with different flexibility characteristics. The first insulating layer provides electrical insulation, while the second insulating layer provides flexibility to prevent breaking during bending. This segmentation allows each layer to perform its specialized function without compromising the other.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the insulating structure have different properties. The first insulating layer has high insulation performance, while the second insulating layer has high flexibility. This local differentiation of properties allows the structure to simultaneously achieve both electrical insulation and bending resistance.

Inventive Principle:

Principle #3Local quality

2Adaptability or versatility

If the display device is made fully flexible to enable bending, then the adaptability is improved, but the insulating layers and wirings are more likely to disconnect

Engineering Contradiction:

Improvebending capabilityVSAvoidwiring connection integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The display device has different structural properties in different regions. The display area maintains a complete multi-layer structure for high reliability, while the terminal area has a simplified structure with enhanced flexibility for bending. This local differentiation allows the device to be adaptable for bending while maintaining wiring integrity in critical areas.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The display device is segmented into a display area and a terminal area with different structural configurations. The terminal area is specifically designed with flexible insulating layers and recess structures to enable bending without disconnection, while the display area maintains the standard structure for optimal display performance.

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If the terminal area is made bendable to enable flexible connections, then the ease of operation is improved, but the insulating layers are more likely to break at the bending portion

Engineering Contradiction:

Improveflexibility for connectionVSAvoidinsulating layer integrity

Core Design Contradiction:

Ease of operationVSStrength

Solution Approach 1:

The terminal area uses thin, flexible insulating film structures that can bend without breaking. The second insulating layer is specifically designed as a thin, flexible film that accommodates bending movements while maintaining insulation properties, preventing the insulating layers from breaking at the bending portion.

Inventive Principle:

Principle #30Flexible shells and thin films

Solution Approach 2:

The recess structure is formed beforehand in the terminal area to accommodate the insulating layers during bending. This pre-formed recess acts as a cushioning structure that reduces stress concentration on the insulating layers, preventing them from breaking when the terminal area is bent for connection.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Data Source

PatentUS11003003B2Display device

Publication Date: 2021.05.11 MAGNOLIA WHITE CORP

AI summary

The purpose of the invention is to realize the flexible display device of high reliability; specifically in a structure that a bending area is in a terminal area, and in that disconnection of the wiring does not occur in the bending area. The concrete structure is that: a display device having a display area, a driving circuit area and a bending area comprising: a first thin film transistor and a first interlayer insulating film are formed in the display area, a second thin film transistor and a second interlayer insulating film are formed in the driving circuit area, terminal wirings to connects the display area and the driving circuit area are formed in the bending area.