Foldable Display Bending Radius Control

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Solution Overview

Problem

Conventional foldable display devices using flexible OLED technology face damage from excessive bending due to insufficient bending radius, leading to abnormal screen conditions when folded.

Innovation Solution

A foldable display device with a main body structure featuring two flat plate areas connected by a bending area with a minimum bending radius, utilizing a bending bracket group of T-shaped brackets and pivot links made of soft materials like silica gel or rubber, and attaching the flexible screen with foam tape to prevent excessive bending.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If the flexible screen is folded using conventional hinge structure, then the device achieves folding capability, but the screen is bent excessively and damaged

Engineering Contradiction:

Improvefolding capabilityVSAvoidscreen integrity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

A bending area with a bending bracket group is introduced as an intermediary structure between the two flat plate areas. This bending bracket group includes multiple T-shaped brackets connected by hinges, creating a mechanical structure that controls the bending radius to be greater than the critical bending radius of the flexible screen, thereby preventing screen damage while enabling folding capability

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The bending area is designed with specific geometric parameters (minimum bending radius) that are controlled to exceed the critical bending radius of the flexible screen. By changing and controlling the bending radius parameter, the device enables folding while maintaining screen integrity

Inventive Principle:

Principle #35Parameter changes

2Volume of moving object

If the flexible screen is forced to fold with small bending radius, then the device achieves compact folded state, but the screen structure is damaged

Engineering Contradiction:

Improvefolded state compactnessVSAvoidscreen structure strength

Core Design Contradiction:

Volume of moving objectVSStrength

Solution Approach 1:

The bending area is designed with a specific curved geometry that ensures the flexible screen bends along a path with radius greater than the critical bending radius. This controlled curvature prevents excessive bending stress on the screen while still achieving a compact folded state

Inventive Principle:

Principle #14Spheroidality (Curvature)

Data Source

PatentUS10091896B2Foldable display device

Publication Date: 2018.10.02 BOE TECHNOLOGY GROUP CO LTD

AI summary

The present disclosure relates to the field of display devices and discloses a foldable display device comprising: a main body structure and a flexible screen provided on a surface of the main body structure; the main body structure includes two flat plate areas and a bending area connecting the two flat plates and making the two flat plate areas have an opening and closing angle of 0 degrees to at least 180 degrees between; the bending area having a minimum bending radius at the time of bending so that the flexible screen attached to the surface of the bending area also has a minimum bending radius, which is greater than a critical bending radius of the flexible screen. The present disclosure allows the flexible screen to have a minimum bending radius when the screen is folded, preventing the flexible screen from being damaged by excessive bending.