Flexible Display Substrate Bonding Area for Higher Bending Yield

Solution Overview

Problem

Existing OLED display devices face issues with reduced bending yield and increased bezel width due to the poor bending endurance of organic insulating layers, leading to fractures in metal conductive layers and circuit wire breakages during bending.

Innovation Solution

A display substrate design that removes the organic insulating layer from the bendable region and incorporates an adjustment protective layer made of optical clear resin (OCR) to protect and support the metal conductive layer, ensuring flexibility and reducing the bending radius.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the organic insulating layer is retained in the bendable region, then the display substrate maintains structural integrity, but the bending yield deteriorates due to fractures in the metal conductive layer

Engineering Contradiction:

Improvebending yieldVSAvoidstructural integrity

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The patent removes the organic insulating layer from the bendable region to eliminate the source of bending-induced fractures. By extracting this problematic layer, the metal conductive layer is no longer constrained by the organic material's poor bending endurance, thereby improving bending yield while maintaining structural integrity through the inorganic insulating layer and adjustment protective layer.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an adjustment protective layer as an intermediary between the metal conductive layer and the organic insulating layer. This protective layer acts as a mediator that protects the metal conductive layer from damage during bending, allowing the organic insulating layer to remain in place while preventing fractures in the metal conductive layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If the organic insulating layer is removed from the bendable region, then the bending yield improves, but the device complexity increases due to additional protective layers

Engineering Contradiction:

Improvebending yieldVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent removes the organic insulating layer from the bendable region to eliminate the source of bending-induced fractures. By extracting this problematic layer, the metal conductive layer is no longer constrained by the organic material's poor bending endurance, thereby improving bending yield while maintaining structural integrity through the inorganic insulating layer and adjustment protective layer.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an adjustment protective layer as an intermediary between the metal conductive layer and the organic insulating layer. This protective layer acts as a mediator that protects the metal conductive layer from damage during bending, allowing the organic insulating layer to remain in place while preventing fractures in the metal conductive layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Area of stationary object

If the bezel width is reduced, then the display area increases, but the bending yield deteriorates due to increased stress on the metal conductive layer

Engineering Contradiction:

Improvedisplay areaVSAvoidbending yield

Core Design Contradiction:

Area of stationary objectVSReliability

Solution Approach 1:

The patent removes the organic insulating layer from the bendable region to eliminate the source of bending-induced fractures. By extracting this problematic layer, the metal conductive layer is no longer constrained by the organic material's poor bending endurance, thereby improving bending yield while maintaining structural integrity through the inorganic insulating layer and adjustment protective layer.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces an adjustment protective layer as an intermediary between the metal conductive layer and the organic insulating layer. This protective layer acts as a mediator that protects the metal conductive layer from damage during bending, allowing the organic insulating layer to remain in place while preventing fractures in the metal conductive layer.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS12543490B2Display substrate, display module and display device

Publication Date: 2026.02.03 CHENGDU BOE OPTOELECTRONICS TECH CO LTD

AI summary

Provided is a display substrate, including a display area and a bonding area located at a side edge of the display area and connected therewith; the bonding area includes a first non-bendable region, a bendable region and a second non-bendable region sequentially arranged and connected; the display substrate further includes a base, and an inorganic insulating layer, a metal conductive layer and an organic insulating layer successively located on the base; orthographic projections of the inorganic and organic insulating layers on the base are located in the display area and the first and second non-bendable regions; the metal conductive layer extends from the display area to the first non-bendable region, the bendable region and the second non-bendable region; the display substrate further includes an adjustment protective layer made of Optical Clear Resin and located on the organic insulating layer; and the adjustment protective layer covers the bendable region.