OLED Display Optical Layer for Polarizer-Free External Light Control
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Solution Overview
Problem
Polarizing plates in organic light-emitting display apparatuses increase thickness and reduce brightness, while microcavity structures with color filters have poor reflectivity and require additional layers for flatness, affecting display quality.
Innovation Solution
Incorporating a low-reflection inorganic layer and a reflection-controlling layer in the display apparatus to absorb and control external light, eliminating the need for polarizing plates and color filters, thereby enhancing optical efficiency and reducing external light reflectance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizing plate is used to view images indoors and outdoors, then visibility is improved, but brightness is reduced and thickness increases
Solution Approach 1:
The patent extracts and eliminates the polarizing plate from the display apparatus structure. Instead of using a polarizing plate to control external light, the invention uses a low-reflection inorganic layer with specific refractive index properties to achieve anti-reflection functionality without the thickness and brightness penalties of traditional polarizing plates
Solution Approach 2:
The patent changes the optical parameters of the display structure by introducing a low-reflection inorganic layer with a refractive index between 1.3-1.7, positioned at a specific thickness of 50-200 nm. This parameter change enables effective external light reflection control while maintaining high brightness and reducing overall device thickness compared to polarizing plate solutions
2Object-affected harmful factors
If a polarizing plate is used to view images indoors and outdoors, then visibility is improved, but thickness increases
Solution Approach 1:
The patent removes the polarizing plate component entirely and replaces it with a thin low-reflection inorganic layer that provides equivalent or superior anti-reflection functionality with minimal thickness addition to the display structure
Solution Approach 2:
The patent employs a thin film approach using a low-reflection inorganic layer with thickness of 50-200 nm, which is significantly thinner than traditional polarizing plates. This thin film provides the necessary optical control while minimizing impact on overall display thickness
3Illumination intensity
If a microcavity structure with color filter is used, then color display is achieved, but reflectivity is poor and additional layers are required
Solution Approach 1:
The patent extracts and eliminates the color filter layer from the display structure. Instead of using a microcavity structure with color filters that require additional flatness correction layers, the invention uses the low-reflection inorganic layer in combination with the organic light-emitting device to achieve both color display and high optical efficiency in a simplified structure
Solution Approach 2:
The low-reflection inorganic layer serves multiple functions simultaneously: it provides anti-reflection properties, enables color display through its interaction with the organic light-emitting device, and eliminates the need for separate color filter and flatness correction layers, thereby reducing overall device complexity
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 improves display quality and visibility by minimizing external light reflectance, reducing thickness, and lowering power consumption, while maintaining high luminance and reaction speed.
Implementation Method 1
a low-reflection inorganic layer may be provided in the display apparatus to absorb light incident in the interior of the display apparatus
Implementation Method 2
induce extinction interference between metals in an opening to thereby reduce or block light passing to the outside of the display apparatus
Data Source
AI summary
A display apparatus includes: a substrate; a layer disposed on the substrate and including an organic light-emitting device; a low-reflection inorganic layer disposed on the display device layer including an inorganic material; a light-blocker is disposed on the low-reflection inorganic layer; and a reflection-controlling layer disposed on the light-blocker.