Rollable Display Mid Cover with Back Bars for Stress Distribution
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Solution Overview
Problem
Rollable display devices face challenges in reducing stress on the display panel during winding and unwinding, leading to potential deformation and wrinkles, while also requiring improved side strength and reduced thickness to enhance reliability and aesthetics.
Innovation Solution
Incorporating a mid cover with a plurality of back bars on the rear surface, which are attached using adhesive layers, to distribute stress and maintain panel flatness, while the mid cover's design allows for reduced thickness and hidden back bars to enhance side strength and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the display panel is made thinner to reduce device volume, then the device volume is reduced, but the side strength and reliability deteriorate
Solution Approach 1:
The patent uses a composite structure combining a thin display panel with a separate support structure (frame and rear cover) that provides mechanical strength. The display panel itself remains thin for reduced volume, while the composite assembly maintains overall structural integrity through the supporting frame and rear cover components.
2Shape
If the display panel is made thinner to improve aesthetics, then the appearance is improved, but wrinkles may occur during winding and unwinding
Solution Approach 1:
The patent employs a flexible support structure including a frame and rear cover that can accommodate the bending and deformation of the thin display panel during winding and unwinding operations. This flexible support system prevents wrinkles from forming on the thin panel surface while maintaining its aesthetic thin profile.
3Strength
If a support structure is added to improve side strength, then the strength is improved, but the device complexity increases
Solution Approach 1:
The patent integrates the support structure (frame and rear cover) with the display panel assembly in a unified structure. The frame and rear cover serve dual purposes: providing mechanical strength and side support while also forming part of the overall device housing, thereby reducing the need for separate structural components and minimizing device complexity.
4Stress or pressure
If a mid cover with back bars is added to distribute stress, then stress distribution is improved, but the device complexity increases
Solution Approach 1:
The frame and rear cover structure serves multiple functions simultaneously: it distributes stress during winding and unwinding, provides side support, prevents wrinkles, and forms part of the device housing. This multi-functional design eliminates the need for separate dedicated stress-distribution components, thereby reducing overall device complexity while achieving stress distribution.
Data Source
AI summary
Disclosed herein is a display device. The display device comprises: a mid cover; a display panel disposed on the mid cover and having a plurality of pixels defined therein; a plurality of back bars disposed under the mid cover; and a roller fixed to the mid cover. The mid cover, the display panel and the plurality of back bars are wound around or unwound from the roller.