Anti-Reflection Member for Top-Emission OLED Contrast
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Solution Overview
Problem
In top-emission type display devices using organic electroluminescence, light emitted from light emitting elements is often reflected by black matrixes, leading to light mixing into adjacent pixel regions, which decreases contrast due to the high reflectance of metal films used in black matrixes.
Innovation Solution
Incorporating an anti-reflection member on the second substrate side, such as a moth eye structure or anti-reflection coating, to prevent light reflection from the first substrate side at boundary portions in pixel regions, thereby reducing light mixing between pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a metal film of titanium is used for the black matrix, then light shielding property is improved, but reflectance of light increases causing light mixing into adjacent pixels
Solution Approach 1:
An anti-reflection member is introduced as an intermediary component between the black matrix and the pixel region. This mediator prevents direct interaction between reflected light and the pixel region, thereby eliminating the harmful effect of light mixing while preserving the excellent light shielding property of the metal film black matrix
Solution Approach 2:
The invention converts the harmful reflection property of the metal film black matrix into a beneficial anti-reflection effect by positioning the anti-reflection member at specific locations (boundary portions). The anti-reflection member utilizes the reflected light and redirects it away from adjacent pixels, transforming the harmful reflection into a useful anti-reflection function
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
Effectively prevents light emission from reflecting into adjacent pixel regions, enhancing contrast and image purity by minimizing light interference at pixel boundaries.
Implementation Method 1
an anti-reflection member configured to prevent reflection of light from a first substrate side at a boundary portion in a pixel region
Data Source
AI summary
There is provided a display device including a plurality of light emitting elements over a first substrate, and an anti-reflection member configured to prevent reflection of light from a first substrate side at a boundary portion in a pixel region corresponding to each of the light emitting elements, the anti-reflection member being on a second substrate side where a second substrate faces the first substrate.