Reflector Light Absorption Fill Layer Stray Light Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display devices using self-luminous light emitting elements, such as organic EL elements, suffer from picture quality deterioration due to stray light caused by alignment shifts between the reflector and the light emitting elements, especially when no color filter is provided, leading to reduced contrast and visibility.
Innovation Solution
A reflector is designed with a base having opposed surfaces, including a reflective element and multiple fill layers, one of which is a light absorption fill layer, to absorb leaked light and reduce stray light by forming a recessed part around the reflective element and covering it with a light absorption material, thereby improving light extraction efficiency and suppressing color mixture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflector is used to extract light from the second electrode side, then luminance is improved, but alignment shift causes leaked light to become stray light and deteriorate picture quality
Solution Approach 1:
A light absorption fill layer is introduced as an intermediary substance between the reflective element and the surrounding environment. This fill layer selectively absorbs leaked light that would otherwise become stray light, while allowing the reflective element to continue extracting light effectively for luminance improvement.
Solution Approach 2:
The light absorption property is localized specifically to the fill layer surrounding the reflective element, rather than applying absorption properties throughout the entire display structure. This localized approach targets stray light generation points without affecting the overall light extraction efficiency.
2Device complexity
If no color filter is provided to simplify structure, then device complexity is reduced, but stray light from alignment shift becomes more conspicuous and picture quality deteriorates
Solution Approach 1:
The light absorption fill layer serves as an intermediary component that compensates for the absence of a color filter. It absorbs stray light at its source near the reflective element, preventing color mixture and picture quality deterioration without adding the complexity of a color filter system.
3Object-affected harmful factors
If a light shield film is added to increase contrast, then visibility is improved, but device complexity and manufacturing process complexity increase
Solution Approach 1:
The light absorption function is merged with the fill layer that already surrounds the reflective element during manufacturing. This integration eliminates the need for a separate light shield film layer, achieving contrast improvement without increasing device complexity or manufacturing process complexity.
Solution Approach 2:
The fill layer is given multiple functions: it provides structural support around the reflective element and simultaneously absorbs stray light to improve contrast. This multi-functionality eliminates the need for separate dedicated contrast-enhancing components.
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 effectively reduces stray light and enhances picture quality by improving light extraction efficiency and suppressing color mixture, leading to increased luminance and contrast without the need for additional components or complex manufacturing processes.
Implementation Method 1
a plurality of fill layers formed around the reflective element and including at least one light absorption fill layer
Implementation Method 2
a base having first and second surfaces which are opposed to each other, the second surface being provided with a reflective element
Data Source
AI summary
A reflector capable of suppressing contrast reduction caused by retro-reflection, a display device having the same, and a method of manufacturing the same are provided. The reflector includes: a base having first and second surfaces which are opposed to each other, the second surface being provided with a reflective element; and a plurality of burying layers formed around the reflective element and including at least one light absorption burying layer.