Light Control Layer for UV-Stable Color in Thin Electronic Displays
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Solution Overview
Problem
Existing electronic devices face challenges in maintaining light reliability and color stability under ultraviolet exposure, particularly in thin and flexible designs with reduced optical functional layers.
Innovation Solution
Incorporating a light control layer with light-absorbing particles and a colorant, which includes materials like SiO2, TiO2, and specific compounds, to absorb ultraviolet light and minimize transmittance changes, ensuring minimal perceptible color difference and improved color gamut.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the number of optical functional layers is reduced to achieve thin electronic devices, then device thickness is reduced, but light reliability and color stability under ultraviolet exposure deteriorate
Solution Approach 1:
The patent combines multiple functions into a single light control layer: UV absorption (using particles like TiO2, SiO2), color filtration (using colorants), and light modulation. This integration maintains thin device profile while ensuring comprehensive light reliability protection that would otherwise require multiple separate layers
Solution Approach 2:
The light control layer uses composite materials combining inorganic particles (TiO2, SiO2, CeO2) with organic colorants in a resin matrix. This composite structure provides both UV absorption capability and color stability, achieving reliable light control in a thin single layer without requiring multiple functional layers
2Ease of manufacture
If light control layer uses conventional materials without light-absorbing particles, then manufacturing is simpler, but color stability and transmittance consistency under UV exposure deteriorate
Solution Approach 1:
The patent converts the harmful effect of UV light into a beneficial filtering mechanism by incorporating particles with maximum absorption wavelengths of 370-400 nm. These particles absorb UV radiation that would otherwise degrade colorants, transforming UV exposure from a harmful factor to a controlled filtering process that protects color stability
Solution Approach 2:
The patent optimizes specific parameters: particle concentration (0.01-5.00 wt%), particle size (5-100 nm average diameter), and absorption wavelength (370-400 nm maximum). These parameter optimizations ensure effective UV absorption and color stability while maintaining manufacturability through controlled deposition processes
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 enhances the light reliability and stability of electronic devices by reducing ultraviolet impact on colorants, maintaining consistent color performance and transmittance, even after exposure to UV light.
Implementation Method 1
light-absorbing particles having a maximum absorption wavelength of about 370 nm to about 400 nm
Implementation Method 2
the colorant may include at least one of an anthraquinone-based compound, a phthalocyanine-based compound, an azo-based compound
Data Source
AI summary
An electronic device includes a base layer, a light-emitting element layer disposed on the base layer and including a pixel defining film in which an opening is defined and a light-emitting layer disposed in the opening, an inorganic deposition layer disposed on the light-emitting element layer, an encapsulation layer disposed on the inorganic deposition layer, and a light control layer disposed on the encapsulation layer and including a base part, light-absorbing particles having a maximum absorption wavelength of about 370 nm to about 400 nm, and a colorant. Therefore, the electronic device may have excellent optical reliability.