Foldable Display Black Coating for Concealing Fold-Area Openings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Foldable display devices face issues with visible opening patterns in the fold area, increased thickness due to adhesive layers, and reduced reliability and heat dissipation, which affect exterior quality and functionality.
Innovation Solution
A foldable display device with a black coating layer comprising carbon black particles of varying sizes is used to conceal opening patterns, reduce light reflection, and enhance heat dissipation, utilizing recycled and bio-based carbon black for eco-friendliness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a plate bottom with opening patterns is disposed under the display panel to support it and secure flexibility, then the display panel can be folded with a target radius of curvature, but the opening patterns become visible to users causing deterioration in exterior quality
Solution Approach 1:
A black coating layer comprising carbon black particles is applied to the plate bottom in the fold area to change its color appearance. This black coating conceals the opening patterns from user view while maintaining the structural functionality of the plate bottom for supporting the display panel and enabling folding.
2Object-affected harmful factors
If additional members are provided to prevent opening patterns from being visible, then exterior quality improves, but a plurality of adhesive layers must be disposed to bond each layer increasing the entire thickness
Solution Approach 1:
The black coating layer is integrated directly onto the plate bottom structure, merging the concealing function with the existing support structure. This eliminates the need for separate additional members and multiple adhesive layers, thereby preventing opening pattern visibility without significantly increasing device thickness.
3Object-affected harmful factors
If multiple adhesive layers are disposed to bond additional layers, then opening patterns are concealed, but stress applied to the plate bottom and other elements increases at folding times causing deterioration in reliable folding
Solution Approach 1:
The black coating layer is applied directly to the plate bottom, merging the concealing function with the existing structure. This integration reduces the number of bonded interfaces and adhesive layers, thereby decreasing the cumulative stress on the plate bottom and surrounding elements during folding operations and improving folding reliability.
4Object-affected harmful factors
If a black coating layer with carbon black particles is used to conceal opening patterns, then exterior quality and visual appearance improve, but the complexity of the coating composition increases
Solution Approach 1:
The black coating layer utilizes composite material science by incorporating carbon black particles of three different average particle size ranges into a resin matrix. This composite approach achieves effective concealment of opening patterns and optimal optical properties through the synergistic combination of different particle sizes, while the use of recycled and bio-based carbon black also addresses environmental concerns.
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 solution effectively hides opening patterns, improves visual black appearance, reduces light reflection, and enhances heat dissipation while maintaining device reliability and reducing environmental impact.
Implementation Method 1
a black coating layer disposed on at least one surface of the back plate and configured to comprise a first carbon black particle having an average particle size of less than 2 um, a second carbon black particle having an average particle size of 2 um or greater and less than 5 um, and a third carbon black particle having an average particle size of 5 um or greater
Implementation Method 2
an aggregate of carbon black particles is used, thereby securing improvement in heat dissipation properties
Data Source
AI summary
A foldable display device can include a display panel having a fold area, a plate bottom supporting the display panel from a lower portion of the display panel and having a plurality of opening patterns corresponding to the fold area, a back plate disposed between the display panel and the plate bottom, and a black coating layer disposed on at least one surface of the back plate. The black coating layer includes a first carbon black particle having an average particle size of less than 2 um, a second carbon black particle having an average particle size ranging from 2 um to less than 5 um, and a third carbon black particle having an average particle size of 5 um or greater.