Display Device Window Substrate with Ultraviolet Blocking Layer
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Solution Overview
Problem
Organic light-emissive display devices face issues with external light reflection and ultraviolet ray damage, leading to degradation in transmittance and potential device defects, which existing polarizing plates partially address but at the cost of increased device thickness and complexity.
Innovation Solution
A display device design featuring a window substrate with two glass substrates and an ultraviolet blocking layer between them, providing high impact resistance and ultraviolet blocking capabilities while omitting the need for a polarizing plate, thus maintaining thinness and image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used to reduce external light reflection, then reflection is reduced, but device thickness increases and transmittance degrades
Solution Approach 1:
The patent extracts and removes the polarizing plate from the display device structure, replacing it with a window substrate that has built-in ultraviolet blocking capability. This elimination of the separate polarizing plate reduces device thickness while maintaining the ability to control harmful light effects through the window substrate's material properties and layer structure.
Solution Approach 2:
The window substrate is designed to perform multiple functions simultaneously: it serves as the protective front cover, provides ultraviolet blocking, and reduces external light reflection through its specific layer structure. By integrating these functions into a single component rather than using separate layers, the device achieves multi-functionality without increased thickness.
2Object-affected harmful factors
If a polarizing plate is used to reduce external light reflection, then reflection is reduced, but transmittance of emitted light degrades
Solution Approach 1:
By removing the polarizing plate from the optical path, the patent eliminates the transmittance degradation that occurs with polarized filters. The window substrate's layer structure is designed to block harmful ultraviolet light while maintaining high transmittance for visible emitted light, thus resolving the contradiction between reflection reduction and light transmission.
Solution Approach 2:
The window substrate employs local quality by using specific materials and layer configurations that selectively interact with different wavelengths of light. The ultraviolet blocking layer is designed to absorb or reflect ultraviolet wavelengths while being transparent to visible wavelengths, allowing the device to reduce harmful light reflection without degrading the transmittance of emitted visible light.
3Adaptability or versatility
If the window substrate is made thinner to maintain flexibility, then flexibility improves, but impact resistance decreases
Solution Approach 1:
The window substrate is constructed as a composite structure with multiple layers including glass substrates and an ultraviolet blocking layer. This composite design allows the substrate to maintain thinness for flexibility while the layered composite structure provides enhanced impact resistance through the combined mechanical properties of different materials and the energy-absorbing interfaces between layers.
Solution Approach 2:
The window substrate design incorporates beforehand cushioning by using a multi-layer composite structure that is pre-configured to absorb and distribute impact energy. The specific layer arrangement and material selection provide built-in shock absorption capability that protects the underlying display panel from impact damage even when the overall substrate thickness is reduced for flexibility.
4Reliability
If ultraviolet blocking is enhanced to protect the display panel, then device reliability improves, but visible light transmittance may be affected
Solution Approach 1:
The ultraviolet blocking layer uses local quality by being selectively designed to interact only with ultraviolet wavelengths while remaining transparent to visible light. This wavelength-selective property allows the layer to provide comprehensive ultraviolet protection for device reliability without affecting the transmittance of visible light needed for display quality.
Solution Approach 2:
The ultraviolet blocking layer exploits color changes principles by using materials that have high absorption coefficients for ultraviolet wavelengths but high transmittance for visible wavelengths. This optical property differentiation allows the layer to block harmful ultraviolet radiation while maintaining excellent visible light transmission, thus improving device reliability without compromising display performance.
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 blocks ultraviolet rays and reduces external light reflection, enhancing the display device's impact resistance and image clarity without the thickness and complexity of a polarizing plate, while allowing visible light to pass through, thus maintaining a thin and flexible form factor.
Implementation Method 1
The ultraviolet blocking layer may have transmissivity of about 10% or less in a wavelength band of less than about 350 nm
Implementation Method 2
The ultraviolet blocking layer may include an optically transparent adhesive
Implementation Method 3
At least one of the base substrates may be chemically tempered
Data Source
AI summary
A display device, including: a display panel configured to display an image through a frontal surface thereof; and a window substrate disposed on the frontal surface of the display panel. The window substrate includes at least two sheets of base substrates. The display device may also include an ultraviolet blocking layer. The ultraviolet blocking layer may be disposed between the at least two base substrates.