Foldable Display Glass Patterns for Crack-Resistant Folding
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Solution Overview
Problem
Existing flexible display devices face issues with thickness, durability, and display quality due to the use of coated polarization films, which are thick and prone to cracking and peeling when folded, and metal cathodes that reflect external light, degrading contrast ratios.
Innovation Solution
A foldable display device design incorporating a glass substrate with specific patterns and coatings, including a first pattern on the glass substrate and a cover glass, to enhance foldability and durability, while eliminating the need for a polarizer by using color filters to absorb external light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a coated polarization film is used instead of a thick polarizer, then the device thickness is reduced, but the film is prone to cracking and peeling when folded
Solution Approach 1:
The patent applies a flexible coating layer containing a polarization film over the color filters. This thin film structure reduces device thickness while the flexible coating layer prevents cracking and peeling during folding operations, resolving the contradiction between thinness and durability.
Solution Approach 2:
The patent combines the polarization film with a flexible coating layer to create a composite structure. This composite approach maintains the thinness advantage of the polarization film while the coating layer provides mechanical strength and flexibility to prevent cracking and peeling during folding.
2Object-affected harmful factors
If a metal cathode is used to reduce reflection, then external light reflection is suppressed, but contrast ratio deteriorates due to reflected light
Solution Approach 1:
The patent uses color filters that selectively absorb specific wavelengths of light. The red, green, and blue color filters absorb their respective complementary wavelengths, converting reflected light into absorbed light. This maintains high contrast ratios while suppressing external light reflection, eliminating the need for metal cathodes.
3Length of moving object
If the thickness of the coated polarization film is reduced, then device thickness is minimized, but polarization function and display quality deteriorate
Solution Approach 1:
The patent employs a flexible coating layer that contains the polarization film, allowing the polarization film to be thin while still functioning effectively. The coating layer protects the thin polarization film and maintains its polarization function without requiring excessive thickness.
4Reliability
If glass substrate and cover glass are used, then durability is improved, but foldability is restricted
Solution Approach 1:
The patent uses thin flexible coating layers and flexible substrates that allow the glass substrate and cover glass to be folded. The flexible coating layer conforms to the curvature during folding while maintaining the durability benefits of glass materials, enabling both in-folding and out-folding operations.
Solution Approach 2:
The patent creates a dynamic structure where the flexible coating layer can deform during folding operations. The coating layer adapts its shape and thickness during folding, allowing the rigid glass substrate to be folded without breaking, thus achieving both durability and foldability.
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 foldability and durability, reduces manufacturing steps, and maintains display quality by preventing cracks and peeling, allowing for both in-folding and out-folding operations.
Implementation Method 1
a polarizer is disposed below a cover member to absorb the external light. The polarizer is a film having a predetermined level of light transmittance and absorbs external light and reflected light thereof to suppress the deterioration of the contrast ratio
Implementation Method 2
the organic light emitting display device includes an anode, a cathode, and an organic light emitting layer disposed therebetween
Data Source
AI summary
A foldable display device includes a folding area and non-folding areas on both sides of the folding area, which includes folding shoulder areas on both sides to be adjacent to the non-folding area and a folding center area inside from the folding shoulder areas on both sides. The foldable display device includes a glass substrate having a first pattern corresponding to the folding area; a first bottom coating layer on a bottom surface of the glass substrate and filled in the first pattern; a light emitting diode on the glass substrate; an encapsulation layer on the light emitting diode; a plurality of color filters and a black matrix on the encapsulation layer; and a cover glass on the plurality of color filters. Any one of organic material layers located between the plurality of color filters and the cover glass includes a second pattern corresponding to the folding area.