Foldable OLED Display Structure With Variable Protector Thickness
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Solution Overview
Problem
Foldable display devices with light emitting elements face defects and yield issues in their foldable parts, necessitating improved design to enhance reliability and adhesion performance.
Innovation Solution
A foldable display device design featuring a flexible substrate with light emitting units in different regions, where the thickness ratio of protectors to the substrate varies, optimizing the neutral plane and adhesion for improved reliability, with thicker protectors in the foldable region to enhance bonding and reduce damage probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light emitting elements are disposed in foldable parts of the foldable display device, then the device can be folded and expanded, but the light emitting elements easily have defects and yield is reduced
Solution Approach 1:
The patent applies local quality by making the protector thickness non-uniform across different regions. Specifically, the foldable display region has a greater protector-to-substrate thickness ratio compared to the flat display region. This localized variation in protector thickness provides enhanced protection and stress distribution precisely where needed (in the foldable region) without compromising the overall device performance.
2Ease of manufacture
If uniform protector thickness is used across the entire display device, then manufacturing is simplified, but the foldable region experiences higher stress and cracking probability
Solution Approach 1:
The patent implements local quality by specifying that the foldable display region has a greater ratio of protector thickness to substrate thickness compared to the flat display region. This non-uniform distribution optimizes stress management and adhesion in the foldable area while maintaining manufacturing feasibility through a systematic thickness variation approach.
3Reliability
If thicker protectors are used in the foldable region, then adhesion and bonding are improved, but device complexity increases
Solution Approach 1:
The patent applies parameter changes by varying the protector thickness parameter across different regions of the display device. Specifically, the thickness ratio of protector to substrate is changed in the foldable display region compared to the flat display region. This parameter variation optimizes bonding strength and stress distribution in the foldable area while maintaining a relatively simple overall structure.
Data Source
AI summary
A display device having a display region includes a substrate, a plurality of organic light emitting parts disposed on the substrate in the display region, an organic layer disposed on at least one of the plurality of organic light emitting parts, a circuit layer disposed on the substrate, and a first layer disposed between the organic layer and the circuit layer. At least a portion of the organic layer has a curved profile.