Flexible Display Protection Film with Varying Thickness
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Solution Overview
Problem
Flexible OLED displays face challenges in maintaining flexibility and protecting against external impacts while incorporating a protection film, and in controlling the neutral plane position during bending.
Innovation Solution
A display device design featuring a flexible display panel with a first protection film having a mesh shape and varying thickness and opening sizes, adhered with adhesive layers, and a second protection film covering the openings, which enhances flexibility and allows control over the neutral plane position during bending.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a protection film is added to protect against external impacts, then protection capability is improved, but flexibility deteriorates
Solution Approach 1:
The protection film is divided into multiple regions with different thicknesses (first through fourth thicknesses) corresponding to different bending areas. This segmentation allows each region to provide appropriate protection while accommodating local flexibility requirements, resolving the contradiction between overall protection and local flexibility.
Solution Approach 2:
Different regions of the protection film have different thickness characteristics - thicker regions provide enhanced protection where needed, while thinner regions maintain flexibility in bending areas. This local differentiation of quality enables the film to simultaneously provide protection and flexibility in different locations.
2Ease of manufacture
If a uniform thickness protection film is used, then manufacturing simplicity is improved, but neutral plane control capability deteriorates
Solution Approach 1:
The protection film employs varying thicknesses in different regions (first, second, third, and fourth thicknesses) to control the neutral plane position during bending. This local quality variation enables precise control of stress distribution and neutral plane location, overcoming the limitation of uniform thickness films.
Solution Approach 2:
The thickness parameter of the protection film is changed across different regions to achieve neutral plane control. By adjusting the thickness parameter locally, the film can control stress distribution and neutral plane position during bending operations, enhancing adaptability while remaining manufacturable.
3Strength
If the protection film is made thicker for better protection, then protection capability is improved, but flexibility deteriorates
Solution Approach 1:
The protection film is segmented into regions with different thicknesses, allowing thicker sections to provide enhanced protection where needed while thinner sections maintain flexibility in bending areas. This segmentation resolves the contradiction by distributing thickness strategically across different functional zones.
Solution Approach 2:
Different local regions of the protection film have different thickness qualities - thicker regions provide maximum protection against impacts, while thinner regions maintain flexibility for bending. This local quality differentiation enables the film to simultaneously achieve both protection and flexibility without requiring uniform thickness throughout.
Data Source
AI summary
A display device is disclosed. In one aspect, the display device includes a flexible display panel, and a first protection film attached to the flexible display panel and including a plurality of openings at least two of which have different sizes.