Organic EL Display Reflector Shape Control
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Solution Overview
Problem
Existing organic electroluminescence (EL) display units face challenges in light extraction efficiency due to deformation of the reflector formed from resist materials during manufacturing, leading to variations in luminance and insufficient light extraction effects.
Innovation Solution
The display unit incorporates a reflector structure with a pixel separation film and a sealing layer of different refractive indices, featuring first openings on the pixel electrode and second dummy openings at the peripheral edge to control the shape and reduce variations, enhancing light extraction efficiency and uniformity in luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a reflector is formed using resist material, then the light extraction efficiency can be improved, but the reflector deforms during manufacturing causing luminance variations
Solution Approach 1:
The patent changes the material parameter from resist to photo-curable resin, which allows for better shape control after curing. The photo-curable resin maintains its formed shape through photopolymerization, preventing the deformation issues encountered with resist materials while still enabling reflector formation for improved light extraction.
Solution Approach 2:
The patent applies a photo-curable resin before the manufacturing process completes, allowing the reflector shape to be preliminarily established and fixed through photopolymerization. This preliminary action prevents subsequent deformation during manufacturing steps, ensuring shape uniformity across the display surface.
2Ease of manufacture
If the reflector shape is not controlled, then manufacturing is simpler, but light extraction efficiency and luminance uniformity deteriorate
Solution Approach 1:
The patent uses photo-curable resin that can be precisely shaped through photolithography and then fixed through UV curing. This material parameter change enables controlled reflector shapes (such as convex or concave forms) that optimize light extraction efficiency while maintaining manufacturing feasibility through standard photolithographic 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
This configuration improves light extraction efficiency and reduces luminance variations by controlling the shape of the reflector and maintaining uniformity across the display region, thereby enhancing the overall performance of the organic EL display unit.
Implementation Method 1
a light-reflecting layer (first member) that is provided on a first substrate on which light-emitting devices are provided, and that reflects light from the light-emitting devices to display surface side
Implementation Method 2
a refractive index (n.sub.1) of the first member and a refractive index (n.sub.2) of the second member are different from each other, which leads to at least a portion of light propagating through the second member being reflected on the surface of the first member facing the second member
Implementation Method 3
organic electroluminescence (EL) devices emitting light with use of an organic EL phenomenon
Data Source
AI summary
A display unit of the present disclosure includes: a plurality of pixels that are disposed in a regular manner; a plurality of first openings that are provided in each of the plurality of pixels; and one or more second openings that are provided in at least a portion of a peripheral edge of each of the plurality of pixels that are disposed in a regular manner.