Stretch-Hole Display Substrate for Bendable Trace Reliability

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Solution Overview

Problem

Existing display substrates with bendable regions face issues of wrinkles and broken wires due to the absence of stretch holes in trace circuit regions, leading to potential failure during stretching.

Innovation Solution

Incorporating stretch holes in the first power supply trace region and first pixel circuit region of the bendable region, forming an opening structure to prevent wrinkles and broken wires during stretching.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If stretch holes are not provided in the power supply trace region, then the manufacturing process is simpler, but wrinkles and broken wires occur during stretching

Engineering Contradiction:

Improvestructural integrityVSAvoidstructure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The power supply trace region is segmented by introducing stretch holes that divide the continuous trace into multiple sections. These holes allow the trace to deform independently in each segment during stretching, preventing wrinkles and broken wires while maintaining electrical connectivity through via structures.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The power supply trace region is transformed into a porous structure by incorporating stretch holes. This porous configuration enables the trace to expand and deform during stretching operations, accommodating mechanical deformation without causing structural failure or wire breakage.

Inventive Principle:

Principle #31Porous materials

2Adaptability or versatility

If the display substrate is made rigid, then manufacturing precision is easier to achieve, but flexibility and bendability are reduced

Engineering Contradiction:

ImproveflexibilityVSAvoidalignment precision

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The substrate structure is segmented into rigid flat regions and flexible bendable regions with stretch holes. This segmentation allows different parts of the substrate to have different mechanical properties, enabling overall flexibility while maintaining manufacturing precision in the rigid flat region where high-precision circuit patterns are formed.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the substrate are given different local qualities: the flat region maintains high rigidity and manufacturing precision for circuit formation, while the bendable region with stretch holes provides flexibility and stretchability. This local differentiation resolves the contradiction between rigidity and flexibility.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS12532619B2Display substrate and display apparatus

Publication Date: 2026.01.20 BOE TECHNOLOGY GROUP CO LTD

AI summary

A display substrate and a display apparatus. The display substrate includes a base substrate and a circuit structure layer disposed on the base substrate, the circuit structure layer includes a flat region and a bendable region provided on at least one side of the flat region, the bendable region includes at least one stretch region, the stretch region includes a first pixel circuit region and a first power supply trace region, the first power supply trace region is located at one side of the first pixel circuit region away from the flat region, a first stretch hole is provided in the first power supply trace region, and a second stretch hole is provided in the first pixel circuit region.