UV-Blocking Encapsulator for Display Devices
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Solution Overview
Problem
Display devices face damage from ultraviolet light, particularly in outdoor use, due to the transmission of UV rays which can harm organic emission layers and insulating films, leading to reduced light emission efficiency and potential color changes.
Innovation Solution
A display apparatus with an encapsulator structure comprising alternately stacked inorganic and organic films, where the organic films include ultraviolet light absorbents such as benzophenone, benzotriazole, and salicylate compounds dispersed in a matrix, effectively blocking UV light by converting it into heat, thereby reducing damage to the display elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If ultraviolet light absorbents are added to the encapsulator, then UV light resistance is improved, but light transmittance in the visible range may deteriorate
Solution Approach 1:
The patent applies local quality by selecting ultraviolet light absorbents with specific absorption characteristics that target only the UV wavelength range (below 400 nm) while maintaining high transmittance in the visible range (400 nm and above). The absorbents are positioned specifically within the encapsulator structure where they can selectively filter harmful UV rays without interfering with visible light transmission to the display elements.
Solution Approach 2:
The patent employs parameter changes by carefully controlling the concentration, type, and distribution of ultraviolet light absorbents within the encapsulator. By adjusting these parameters, the encapsulator achieves optimal UV blocking performance while maintaining high visible light transmittance. The absorbent concentration is optimized to provide sufficient UV protection without excessively absorbing visible light.
2Reliability
If the encapsulator blocks UV light, then durability of display elements is improved, but energy transmission is reduced
Solution Approach 1:
The patent converts the harmful effect of UV light into a beneficial outcome by using ultraviolet light absorbents that capture UV energy and convert it into harmless forms (primarily heat through non-radiative decay). The UV light that would otherwise damage organic display elements is absorbed and its energy is dissipated safely, protecting the display while minimizing impact on visible light energy transmission.
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 achieves high transmittance for wavelengths of 430 nm or longer while maintaining low transmittance for UV wavelengths, minimizing damage to organic materials and maintaining light emission efficiency, thus enhancing the durability and performance of display devices.
Implementation Method 1
the at least one organic film may include a matrix and an ultraviolet light absorbent dispersed in the matrix... effectively blocking UV light by converting it into heat
Data Source
AI summary
A display apparatus includes a substrate, a display arranged on the substrate and including a plurality of display elements, and an encapsulator arranged on the display and encapsulating the display. The encapsulator may include at least one inorganic film and at least one organic film, and the at least one organic film may include a matrix and an ultraviolet light absorbent dispersed in the matrix.