Rollable Display Second Cover with Variable Holes
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Solution Overview
Problem
Rollable display devices face challenges in durability and rolling characteristics due to stress applied during winding and unwinding, leading to potential degradation and visibility issues with multi-apron structures.
Innovation Solution
A display device design featuring a sheet-type back cover with a second cover that includes contractible and expandable variable holes, formed through a hot press process with a variant-processed metal plate, to minimize thickness and enhance durability, and a cable hole formed using a simple process, reducing the size and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-apron back cover structure is used, then durability is improved, but visible horizontal stripes appear and appearance quality deteriorates
Solution Approach 1:
The patent merges multiple separate aprons into a single integrated sheet-type back cover. This eliminates the visible horizontal stripes that appear between multiple aprons while maintaining the protective function and durability provided by the multi-apron structure. The unified sheet design creates a smooth, continuous surface without the visual discontinuities of segmented aprons.
Solution Approach 2:
The sheet-type back cover uses a homogeneous material structure throughout, eliminating the visual heterogeneity caused by multiple aprons with different seams and joints. This creates a uniform appearance without visible horizontal stripes while providing consistent protective properties across the entire back cover surface.
2Object-generated harmful factors
If a sheet-type back cover is used, then appearance quality is improved and manufacturing cost is reduced, but durability may deteriorate
Solution Approach 1:
The sheet-type back cover is constructed using composite materials that combine the aesthetic advantages of sheet structures with the durability characteristics of multi-apron designs. The composite construction allows the back cover to maintain a smooth, stripe-free appearance while incorporating reinforcing elements or layered structures that enhance strength and durability.
3Adaptability or versatility
If the second cover thickness is reduced for better rolling characteristics, then rolling functionality is improved, but durability and strength deteriorate
Solution Approach 1:
The second cover is designed with local quality variations, having different thicknesses in different regions. Critical areas that require high strength and durability maintain greater thickness, while non-critical areas are thinner to optimize rolling characteristics. This localized thickness distribution allows the cover to meet both durability requirements and rolling functionality without requiring uniform thickness reduction.
4Reliability
If variable holes are made contractible and expandable, then rolling characteristic degradation is suppressed, but manufacturing complexity increases
Solution Approach 1:
The variable holes are designed to change their effective parameters (such as opening area or shape) in response to mechanical deformation during rolling. This parameter change capability allows the holes to accommodate the rolling motion without compromising structural integrity, suppressing rolling characteristic degradation through material behavior rather than complex mechanical mechanisms.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design improves durability, suppresses rolling characteristic degradation, minimizes size, and enhances appearance quality by reducing stress and visibility issues, while maintaining the rolling functionality and cost-effectiveness.
Implementation Method 1
a variable hole which is contractible and expandable is formed in a second cover
Implementation Method 2
the hot press process is performed with the variant-processed metal plate inserted therein to form a cable hole in the second cover
Data Source
AI summary
According to an aspect of the present disclosure, a display device includes: a display panel including a plurality of pixels; a first cover on a rear surface of the display panel; a second cover on a rear surface of the first cover, and a roller which is configured to wind or unwind the display panel, the first cover, and the second cover, the second cover including a plurality of variable holes configured to pass through the second cover. Therefore, it is possible to improve the durability of the display device and suppress the degradation of a rolling characteristic.