Optical Absorption Layer for Display Legibility
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Solution Overview
Problem
Existing organic electroluminescent (EL) display devices suffer from reduced legibility due to external light reflection, as light emitted at angles is not effectively quenched by circular polarization members, leading to decreased contrast and view angle characteristics.
Innovation Solution
Incorporating an optical absorption layer with openings corresponding to lenses, positioned between the lens array and the first electrode, to absorb light entering at maximum inclination angles, thereby reducing external light reflection and enhancing legibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a lens array is arranged on the surface of the display device to reduce total reflection, then light emission efficiency is improved, but external light reflected within the display device cannot be sufficiently suppressed by the circular polarization member alone, leading to reduced legibility
Solution Approach 1:
A black mask layer is introduced as an intermediary component between the lens array and the organic EL elements. This black mask layer absorbs oblique external light that enters through the lens array, preventing it from being reflected by internal structures and re-emitted toward the viewer. The black mask acts as a mediator that selectively intercepts harmful reflected light paths without significantly blocking the desired luminescent light emission.
Solution Approach 2:
The harmful reflected light paths are extracted and blocked by the black mask layer positioned strategically within the optical path. By placing the black mask between the lens array and the organic EL elements, the invention removes the harmful reflection component from the overall light output, separating the desired luminescent light from the unwanted external light reflections.
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 optical absorption layer effectively blocks light entering at large angles, improving legibility by reducing external light reflection and maintaining high brightness, resulting in enhanced display performance.
Implementation Method 1
an optical absorption layer having a plurality of openings corresponding to the plurality of lenses is disposed between the lens array and the first electrode
Implementation Method 2
external light incident on the substrate at an angle, that is, external light having passed through the circular polarization member at an angle, due to refraction by the lenses
Implementation Method 3
a light component that obliquely passes through the circular polarization member (at an angle relative to the normal direction) or a light component having passed through the circular polarization member at an angle cannot be quenched
Data Source
AI summary
An optical absorption layer having a plurality of openings corresponding to lenses is provided between a lens array and a first electrode. An edge of each of the openings is provided such that light entering in a normal direction of a substrate and traveling through an area where the corresponding lens has a maximum inclination angle is blocked.