Foldable Display Back Plate Holes for Stress Relief

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Existing foldable display devices face challenges in achieving bidirectional folding with high reproduction accuracy, as deformation due to folding stress can lead to abnormal folding shapes and reduced accuracy.

Innovation Solution

A foldable display device design that minimizes deformation transfer by forming a plurality of holes in the top plate of the back plate and at least one groove in the bottom plate, allowing for precise omega shape formation during in-folding and reducing stress in the folding shoulder area.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Strength

If a solid back plate structure is used, then structural strength is improved, but deformation transfer to the display panel increases

Engineering Contradiction:

Improvestructural strengthVSAvoidreproduction accuracy of folding shape

Core Design Contradiction:

StrengthVSManufacturing precision

Solution Approach 1:

The back plate incorporates an array of through-holes creating a porous structure that allows stress distribution and deformation absorption during folding operations, preventing rigid stress transfer to the display panel while maintaining overall structural integrity

Inventive Principle:

Principle #31Porous materials

Solution Approach 2:

The back plate uses a composite structure combining a rigid outer layer for strength with a flexible inner layer containing holes for deformation absorption, creating a material system that simultaneously provides structural support and stress relief

Inventive Principle:

Principle #40Composite materials

2Stability of the object's composition

If the back plate is made rigid, then structural stability is improved, but stress concentration in folding shoulder area increases

Engineering Contradiction:

Improvestructural stabilityVSAvoidstress in folding shoulder area

Core Design Contradiction:

Stability of the object's compositionVSStress or pressure

Solution Approach 1:

The back plate features localized flexibility through strategically positioned holes in the folding shoulder area, while maintaining rigid structure in non-folding regions, creating different mechanical properties in different locations to address local stress concerns without compromising overall stability

Inventive Principle:

Principle #3Local quality

3Adaptability or versatility

If bidirectional folding is implemented, then device versatility is improved, but reproduction accuracy of folding shape deteriorates

Engineering Contradiction:

Improvebidirectional folding capabilityVSAvoidreproduction accuracy of folding shape

Core Design Contradiction:

Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The back plate is segmented into multiple functional zones including hole-containing regions for flexibility and solid regions for stability, allowing independent optimization of each zone's properties to support bidirectional folding while maintaining shape accuracy

Inventive Principle:

Principle #1Segmentation

Data Source

PatentUS20250199571A1Foldable display device

Publication Date: 2025.06.19 LG DISPLAY CO LTD

AI summary

A foldable display device may include: a display panel displaying an image; a cover window over the display panel; and a back plate under the display panel. The back plate may include a plate top having a plurality of holes, a plate bottom having at least one groove corresponding to the plurality of holes, and an adhesive layer attaching the plate top and the plate bottom.