Laminated Display Module Support Membrane for Curved-Screen Crack Prevention

Solution Overview

Problem

The issue of crack occurrence in the thin film packaging layer of dual-curved screen display modules due to high stress during lamination, leading to potential failure of the light-emitting layer and impaired display effect.

Innovation Solution

A laminated display module design with a support membrane layer featuring excavated projection regions to reduce stress in curved surface positions, including complete or partial excavation based on crack probability distribution to avoid crack formation in the thin film packaging layer.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Shape

If a dual-curved screen structure is used to increase screen proportion and aesthetic appearance, then the visual effect and modern design are improved, but high stress concentrates in curved surface positions during lamination, causing cracks in the thin film packaging layer

Engineering Contradiction:

Improvecurved screen shapeVSAvoidcrack resistance of thin film packaging layer

Core Design Contradiction:

ShapeVSReliability

Solution Approach 1:

The support membrane layer is designed with different structural properties in different regions: the curved surface regions have reduced support strength (through excavation or reduced thickness) to lower stress concentration, while the smooth region maintains normal support strength. This local differentiation allows the structure to adapt to varying stress conditions across the display module.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The support membrane layer is divided into distinct functional regions: a smooth region corresponding to the flat display area and curved surface regions corresponding to the bent areas. This segmentation allows each region to be optimized independently for its specific functional requirements.

Inventive Principle:

Principle #1Segmentation

2Ease of manufacture

If the support membrane layer maintains uniform structure throughout, then manufacturing simplicity is preserved, but stress distribution becomes uneven in curved positions, leading to crack formation

Engineering Contradiction:

Improvesupport membrane layer fabricationVSAvoidstress distribution uniformity

Core Design Contradiction:

Ease of manufactureVSStress or pressure

Solution Approach 1:

The support membrane layer is designed with different structural properties in different regions: the curved surface regions have reduced support strength (through excavation or reduced thickness) to lower stress concentration, while the smooth region maintains normal support strength. This local differentiation allows the structure to adapt to varying stress conditions across the display module.

Inventive Principle:

Principle #3Local quality

3Reliability

If excavation is applied to the support membrane layer in curved surface regions, then stress on the display layer is reduced and crack prevention is improved, but the structural complexity of the support membrane layer increases

Engineering Contradiction:

Improvecrack prevention in thin film packaging layerVSAvoidsupport membrane layer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The support membrane layer is designed with different structural properties in different regions: the curved surface regions have reduced support strength (through excavation or reduced thickness) to lower stress concentration, while the smooth region maintains normal support strength. This local differentiation allows the structure to adapt to varying stress conditions across the display module.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

Instead of adding support structures to reinforce weak areas, the invention removes material from the support membrane layer in curved regions. This counterintuitive approach reduces stress concentration by decreasing the rigidity of the support membrane where it would otherwise create excessive stress on the display layer.

Inventive Principle:

Principle #13The other way round (Inversion)

Data Source

PatentUS12401737B2Laminated display module and electronic device

Publication Date: 2025.08.26 HONOR DEVICE CO LTD

AI summary

This application provides a laminated display module and an electronic device, including a cover layer, a thin film packaging layer, a display layer, and a support membrane layer that are sequentially covered through lamination from top to bottom. The cover layer includes a smooth region and two curved surface regions along a longitudinal direction. The two curved surface regions are respectively located on two sides of the smooth region, where each curved surface region includes one bending region, and each bending region is projected onto the support membrane layer to form a projection region. The support membrane layer includes a main support region and two side support regions along a longitudinal direction, and a gap is provided between either of the side support regions and the main support region.