Display Encapsulation Light Absorber for UV Degradation Protection
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Solution Overview
Problem
Organic electroluminescence displays are vulnerable to degradation from exposure to ultraviolet rays and certain visible light, necessitating a solution to block these harmful rays effectively.
Innovation Solution
Incorporating a light absorber in the encapsulation member of the display apparatus, comprising a hexagonal heterocycle with specific substituents, to absorb a portion of visible and ultraviolet rays, using alternately laminated organic and inorganic films with tailored transmittance properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a light absorber is incorporated in the encapsulation member to block ultraviolet and visible rays, then the reliability of the light-emitting device is improved, but the device complexity increases
Solution Approach 1:
The light absorber is nested within the encapsulation member structure, specifically incorporated into the organic film layer. This nesting approach allows the light-absorbing function to be integrated into the existing encapsulation architecture without requiring a completely separate external component, thereby improving reliability while minimizing the increase in overall device complexity
Solution Approach 2:
The encapsulation member is designed as a composite structure comprising alternating organic and inorganic films, with the light absorber incorporated into the organic film. This composite material approach enables the encapsulation member to simultaneously provide mechanical protection, environmental barrier, and light absorption functions, resolving the contradiction between improved reliability and device complexity
2Object-affected harmful factors
If alternately laminated organic and inorganic films are used with tailored transmittance properties, then the protection against harmful light is enhanced, but the manufacturing precision requirements increase
Solution Approach 1:
The encapsulation member employs local quality by assigning different transmittance characteristics to different layers: the organic film containing the light absorber is designed with specific transmittance properties (T405≤10%, T430≥70%, T450≥97%) to selectively block harmful wavelengths while transmitting visible light, whereas the inorganic films provide complementary protection. This localized functional differentiation enhances overall light protection without requiring extreme manufacturing precision across the entire structure
Solution Approach 2:
The alternately laminated organic and inorganic films form a composite barrier system where each material type contributes its unique properties. The organic film with incorporated light absorber provides selective wavelength filtering, while the inorganic films provide structural stability and additional environmental barrier. This composite approach distributes the protection requirements across multiple layers with different functions, reducing the precision burden on any single manufacturing step
3Object-affected harmful factors
If the organic film has specific transmittance characteristics (T405≤10%, T430≥70%, T450≥97%), then the light absorption efficiency is improved, but the ease of manufacture decreases
Solution Approach 1:
The invention applies parameter changes by optimizing the chemical structure of the light absorber molecule (specific Formula 1 with hexagonal heterocycle, substituents Ar, R1-R5) to achieve the desired transmittance characteristics. By modifying molecular parameters rather than relying on complex physical structures or post-processing treatments, the patent achieves T405≤10%, T430≥70%, T450≥97% while maintaining compatibility with standard organic film fabrication processes, thus improving light absorption efficiency without excessively compromising ease of manufacture
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 reliability of the light-emitting device by preventing degradation from external light, thereby improving the stability and longevity of the display apparatus.
Implementation Method 1
the light absorber includes a hexagonal heterocycle containing two or more nitrogen atoms as ring-forming atoms, and first to third substituents which are substituted at the hexagonal heterocycle
Implementation Method 2
The at least one organic film and the at least one inorganic film may be alternately laminated, and the at least one organic film may include: a first organic film configured to absorb light in a first wavelength region; and a second organic film configured to absorb light in a second wavelength region different from the light in the first wavelength region
Data Source
AI summary
A display apparatus according to an embodiment includes light-emitting devices and an encapsulation member, wherein the encapsulation member includes a light absorber including a hexagonal heterocycle containing two or more nitrogen atoms as ring-forming atoms, and first to third substituents substituted at the hexagonal heterocycle, the first to third substituents being different from one another, and thus can effectively block external light, thereby exhibiting improved reliability.