Folding Display Module With Preloaded Support Against Screen Creasing

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Solution Overview

Problem

Folding display devices are prone to creasing at bending areas due to fatigue plastic deformation of film and adhesive materials after repeated folding.

Innovation Solution

A display device design incorporating a first and second frame, a hinge transmission mechanism, a support plate, and preload mechanisms to maintain a pretension force on the flexible display screen, allowing it to switch between folded and flattened states without creasing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the flexible display screen is repeatedly folded, then the portability and folding functionality are improved, but the film and adhesive materials undergo fatigue plastic deformation causing creases at bending areas

Engineering Contradiction:
Improvefolding functionalityVSAvoidscreen integrity
Core Design Contradiction:
Adaptability or versatilityVSReliability

Solution Approach 1:

The support plate is pre-configured with preload mechanisms (springs or elastic components) that apply continuous pretension force to the flexible display screen before folding occurs. This preliminary action maintains the screen in a tensioned state during folding operations, preventing the film and adhesive materials from undergoing fatigue plastic deformation and crease formation at bending areas.

Inventive Principle:
Principle #10Preliminary action

2Reliability

If the flexible display screen maintains high tension to prevent creasing, then the screen integrity is improved, but the complexity of the support structure increases

Engineering Contradiction:
Improvescreen integrityVSAvoidsupport structure
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The support structure is segmented into a support plate that directly contacts the flexible display screen and separate preload mechanisms (springs or elastic components) that generate the pretension force. This segmentation allows the tensioning function to be achieved through modular components rather than a monolithic complex structure, simplifying the overall design while maintaining screen integrity.

Inventive Principle:
Principle #1Segmentation

3Reliability

If the flexible display screen is kept in a flattened state with high pretension, then the screen integrity is improved, but the portability is reduced

Engineering Contradiction:
Improvescreen integrityVSAvoidportability
Core Design Contradiction:
ReliabilityVSWeight of moving object

Solution Approach 1:

The support plate is designed to be movable relative to the frame, capable of adjusting its position along the first direction based on the folding state. When the device is folded, the support plate moves to accommodate the bent screen while maintaining appropriate pretension. When flattened, it positions to provide optimal support. This dynamic adjustment allows the system to maintain screen integrity across different states without requiring excessive permanent tension that would compromise portability.

Inventive Principle:
Principle #15Dynamics

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The design ensures the flexible display screen maintains a certain pretension force, preventing creasing during state transitions and improving assembly efficiency and reducing the risk of screen failure.

Implementation Method 1

a first preload mechanism disposed on the second frame, wherein the first preload mechanism is configured to exert a first preload force on the first support plate

Methodology Applied
Scientific EffectPretension force: Tension

Implementation Method 2

a hinge transmission mechanism disposed at a butt joint of the first frame and the second frame, and rotationally connected to the first frame and the second frame, respectively

Methodology Applied
Scientific EffectRotational motion: Hinge

Implementation Method 3

a first support plate slidably connected to the second frame, wherein the first support plate is capable to reciprocate relative to the second frame along a second direction

Methodology Applied
Scientific EffectReciprocating motion: Friction

Data Source

PatentUS12353256B2Display device and folding display module thereof
Publication Date: 2025.07.08 WUHAN CHINA STAR OPTOELECTRONICS SEMICONDUCTOR DISPLAY TECHNOLOGY CO LTD
  • US12353256B2 patent drawing
  • US12353256B2 patent drawing
  • US12353256B2 patent drawing

AI summary

The disclosure provides a display device and a folding display module thereof. The display device includes: a first frame and a second frame butted with the first frame; a hinge transmission mechanism; a first support plate slidably connected to the second frame and being capable to reciprocate relative to the second frame along a second direction; a flexible display screen, wherein an end of the flexible display screen is fixedly attached on the first support plate; and a first preload mechanism disposed on the second frame and being configured to exert a first preload force on the first support plate, wherein a direction of the first preload force is same as the second direction.