UV-Blocking Hard Coating for Flexible Display Protection
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Solution Overview
Problem
Display devices face quality degradation due to ultraviolet light exposure, which existing technologies fail to effectively prevent, especially in thin and flexible display configurations.
Innovation Solution
A protection film with a base layer and a hard coating layer incorporating an ultraviolet light absorber is applied to the surfaces of the display device, providing high mechanical properties and efficient ultraviolet light blocking capabilities, while maintaining high transmittance in visible light ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If existing protection films are used in thin display devices, then the display device can be made thin, but ultraviolet light blocking capability is insufficient leading to quality degradation
Solution Approach 1:
The protection film uses a composite structure with a base layer and a hard coating layer containing ultraviolet light absorbers. This composite material approach enables the film to simultaneously provide mechanical protection and effective ultraviolet light blocking, resolving the contradiction between thinness and UV protection capability.
Solution Approach 2:
The hard coating layer acts as an intermediary between the base layer and the external environment, specifically blocking ultraviolet light before it reaches the display device. This intermediary layer provides the necessary UV protection while maintaining the overall thinness of the display device.
2Object-affected harmful factors
If a thick protection layer is added to block ultraviolet light, then UV protection is improved, but the display device thickness increases
Solution Approach 1:
The patent changes the chemical composition parameters of the protection film by incorporating specific ultraviolet light absorbers in the hard coating layer. This allows achieving effective UV blocking with a thin layer (1-15 μm), avoiding the need for thick protection films and maintaining the thin display device profile.
Solution Approach 2:
The invention uses a thin film structure with a total thickness of 2-60 μm that provides both mechanical protection and ultraviolet light blocking. The hard coating layer, being just 1-15 μm thick, demonstrates that effective UV protection can be achieved with minimal thickness increase.
3Strength
If existing protection films are used, then manufacturing is simple, but mechanical properties and reliability are insufficient
Solution Approach 1:
The protection film employs a composite structure combining a base layer and a hard coating layer with ultraviolet light absorbers. This composite approach enhances mechanical properties and reliability while the coating process remains relatively simple, achieving improved strength without excessive complexity.
Solution Approach 2:
The hard coating layer serves multiple functions simultaneously: it provides mechanical strength enhancement, ultraviolet light blocking, and surface protection. This multi-functionality improves reliability and mechanical properties without requiring multiple separate layers or complex structures.
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 prevents ultraviolet light-induced degradation, ensuring the display device's longevity and maintaining high light efficiency by blocking ultraviolet light while allowing visible light to pass through, thus preserving the display quality.
Implementation Method 1
the hard coating layer has a light transmittance of about 10% or less for light in a wavelength region of about 380 nm to about 410 nm
Data Source
AI summary
A display device includes a display panel, a sensor layer disposed on the display panel, an anti-reflection layer disposed on the sensor layer, where the anti-reflection layer includes a colorant, and a protection member disposed on the anti-reflection layer, where the display panel includes a base substrate, a light emitting element disposed on the base substrate, and an encapsulation layer disposed on the light emitting element, where the protection member includes a base layer, and a protection layer disposed on at least one selected from an upper surface and a lower surface of the base layer, where the protection layer includes a hard coating agent and an ultraviolet light absorber.