Multi-Part Display Cover Engagement for Thin, Rigid Rollable Displays
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Solution Overview
Problem
Existing rollable display devices face issues with bending, rigidity, thickness, and visual recognition of opening portions, as well as flexure during the winding process.
Innovation Solution
A display device design featuring a cover system with a first upper cover and a second upper cover, each having concave and convex portions, and a plate with protruding patterns, which engage to maintain rigidity and reduce thickness while minimizing bending and flexure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single-layer cover is used, then the device structure is simple, but the rigidity is insufficient and bending occurs
Solution Approach 1:
The cover is divided into multiple layers (first cover layer, second cover layer) with different structural characteristics. The first cover layer provides flexibility while the second cover layer with protruding patterns provides rigidity, resolving the contradiction between structural simplicity and rigidity requirements.
Solution Approach 2:
The patent uses composite cover structure combining different material layers with distinct properties. The first cover layer and second cover layer are made of different materials or have different structural configurations, creating a composite structure that simultaneously achieves flexibility and rigidity.
2Strength
If the cover thickness is increased to improve rigidity, then bending is reduced, but the device thickness increases
Solution Approach 1:
Instead of using a single thick cover layer, the patent segments the cover into multiple thinner layers. The first cover layer has smaller thickness and the second cover layer has protruding patterns, collectively providing the required rigidity while maintaining overall thinness.
Solution Approach 2:
The second cover layer features protruding patterns that concentrate structural support at specific locations rather than uniformly increasing thickness. This local reinforcement approach provides necessary rigidity while minimizing overall device thickness.
3Ease of manufacture
If opening portions are made larger for assembly, then manufacturing is easier, but they become visually recognizable from the front surface
Solution Approach 1:
The patent addresses the visual appearance issue by using the depth dimension. The second cover layer with protruding patterns is positioned to cover the opening portions from the front surface view, effectively hiding them while maintaining assembly accessibility.
Data Source
AI summary
A display device includes a display panel, a cover configured to support a rear surface of the display panel, and a roller configured to wind or unwind the display panel and the cover. The cover includes an upper cover bonded to the display panel, and the upper cover includes a first upper cover and a second upper cover. The second upper cover includes a plurality of concave portions and a plurality of convex portions, and the first upper cover is disposed between the display panel and the second upper cover. The first upper cover is disposed to engage with the plurality of concave portions and the plurality of convex portions of the second upper cover.