Bendable Substrate Interlayer Grooves for Signal Line Stress Relief

Solution Overview

Problem

The bending process in narrow frame or frameless electronic display products can lead to signal line breakage, affecting yield and increasing production costs due to excessive local stress.

Innovation Solution

A substrate with a bendable region featuring an interlayer and signal lines, where the interlayer has grooves on its sides to distribute stress uniformly, preventing signal line breakage by enhancing stress release during bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If the non-display portion of the display screen is bent to the back to achieve narrow frame or frameless design, then the appearance and structure of the electronic display product are improved, but the bending process causes excessive local stress that leads to signal line breakage

Engineering Contradiction:

Improvenarrow frame or frameless structureVSAvoidsignal line integrity

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The interlayer is designed with different structures in different regions: in the bendable region, the interlayer has grooves on its sides to reduce stress concentration, while in the non-bendable region, the interlayer maintains its full width for proper signal line support. This local differentiation allows the structure to accommodate bending without causing signal line breakage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The interlayer is segmented by introducing grooves that divide it into multiple sections along the bending direction. These grooves create independent stress zones that can deform separately during bending, preventing stress concentration at any single point and thereby protecting the signal lines from breaking.

Inventive Principle:

Principle #1Segmentation

2Reliability

If the interlayer maintains full width in the bendable region to support signal lines, then signal line protection is improved, but stress concentration during bending increases leading to breakage

Engineering Contradiction:

Improvesignal line protectionVSAvoidlocal stress concentration

Core Design Contradiction:

ReliabilityVSStress or pressure

Solution Approach 1:

The interlayer is designed with different structures in different regions: in the bendable region, the interlayer has grooves on its sides to reduce stress concentration, while in the non-bendable region, the interlayer maintains its full width for proper signal line support. This local differentiation allows the structure to accommodate bending without causing signal line breakage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The interlayer is segmented by introducing grooves that divide it into multiple sections along the bending direction. These grooves create independent stress zones that can deform separately during bending, preventing stress concentration at any single point and thereby protecting the signal lines from breaking.

Inventive Principle:

Principle #1Segmentation

3Reliability

If grooves are added to the interlayer to distribute stress uniformly, then stress release is improved and signal line breakage is prevented, but the interlayer structure complexity increases

Engineering Contradiction:

Improvestress distributionVSAvoidinterlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The interlayer is designed with different structures in different regions: in the bendable region, the interlayer has grooves on its sides to reduce stress concentration, while in the non-bendable region, the interlayer maintains its full width for proper signal line support. This local differentiation allows the structure to accommodate bending without causing signal line breakage.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The interlayer is segmented by introducing grooves that divide it into multiple sections along the bending direction. These grooves create independent stress zones that can deform separately during bending, preventing stress concentration at any single point and thereby protecting the signal lines from breaking.

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS10748937B2Substrate and manufacturing method thereof and display device

Publication Date: 2020.08.18 BOE TECHNOLOGY GROUP CO LTD

AI summary

A substrate and a manufacturing method thereof and a display device are provided. The substrate includes: a base including a bendable region; an interlayer on the base and in the bendable region; and a signal line at a side, facing away from the base, of the interlayer. In the bendable region, an orthographic projection of the signal line on the base is within an orthographic projection of the interlayer on the base; and in the bendable region, the interlayer is provided with a groove on at least one side of a portion, corresponding to the signal line, of the interlayer.