Black Light-Transmittance Reducing Layer in OLED Sealing Film
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Solution Overview
Problem
Existing organic electroluminescent display devices face challenges in achieving thinness and high luminance due to external light reflection, which is exacerbated by the use of polarizers or antireflection films that increase device thickness and reduce light emission.
Innovation Solution
Incorporating a light-transmittance-reducing layer colored in black, preferably containing chromium and chromium oxide, within the sealing film, and optionally covering it with an antireflection film to absorb external light and minimize reflection without the need for additional polarizers or thick antireflection films.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer or antireflection film is arranged on the sealing film to suppress external light reflection, then the image quality is improved, but the device thickness is increased and light emission luminance is reduced
Solution Approach 1:
The patent combines the light-transmittance-reducing layer directly within the sealing film structure, merging the anti-reflection function with the protective sealing function. This eliminates the need for separate polarizer or thick antireflection film layers, thereby suppressing external light reflection while maintaining thin device thickness and high light emission luminance.
2Object-affected harmful factors
If a polarizer or antireflection film is arranged on the sealing film to suppress external light reflection, then the image quality is improved, but the light emission luminance is reduced
Solution Approach 1:
The patent integrates the light-transmittance-reducing layer within the sealing film, combining the anti-reflection function with the protective sealing function. This eliminates the need for separate polarizer or thick antireflection film layers that would block emitted light, thereby suppressing external light reflection while maintaining high light emission luminance.
Solution Approach 2:
The light-transmittance-reducing layer is positioned specifically within the sealing film structure where it can effectively reduce external light reflection without interfering with the light emission path from the organic electroluminescent light-emitting element. This localized placement optimizes both anti-reflection performance and light emission luminance.
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
This configuration allows for a thinner and more luminous organic electroluminescent display device by reducing light transmittance and reflection, while maintaining moisture protection through the use of silicon nitride in the sealing film.
Implementation Method 1
a light-transmittance-reducing layer colored in black
Implementation Method 2
light incident on the sealing film from the outside of the organic electroluminescent display device is reflected by an anode (reflection film)
Data Source
AI summary
An organic electroluminescent display device of the invention includes an element substrate, an organic electroluminescent light-emitting element disposed on the element substrate, and a sealing film disposed on the organic electroluminescent light-emitting element, wherein the organic electroluminescent light-emitting element includes an anode formed of metal and disposed on the element substrate, a light-emitting layer disposed on the anode, and a transparent cathode disposed on the light-emitting layer, and the sealing film includes a light-transmittance-reducing layer colored in black.