OLED Antireflection Layer for Brightness and Cost Reduction
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Solution Overview
Problem
Organic light emitting diode display devices face reduced brightness and increased manufacturing costs due to the use of polarizers for antireflection, which also shorten the lifetime of the light-emitting portion and compromise cost competitiveness.
Innovation Solution
Replacing the polarizer with an antireflection layer comprising a metallic layer and an insulating layer, which minimizes outside light reflection through absorption and destructive interference, thereby improving light transmittance and reducing manufacturing complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarizer is used to minimize outside light reflection, then outer visibility is improved, but light transmittance decreases and brightness is reduced
Solution Approach 1:
The patent changes the optical parameters of the antireflection layer by controlling the thickness of the insulating layer (λ/4 phase thickness) and selecting specific refractive index materials to achieve destructive interference of reflected light, thereby reducing reflection without the severe brightness penalty of polarizers
Solution Approach 2:
The patent uses a composite structure consisting of a metallic layer (silver or aluminum) combined with an insulating layer (silicon oxide, silicon nitride, or silicon oxynitride) to create an antireflection coating that achieves both low reflection and high light transmittance, avoiding the brightness loss associated with polarizers
2Object-affected harmful factors
If a polarizer is used for antireflection, then outer visibility is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive polarizer materials with a cost-effective antireflection layer composed of commonly used metals (silver, aluminum) and insulating materials (silicon oxide, silicon nitride) that can be deposited using standard semiconductor manufacturing techniques, significantly reducing material costs
Solution Approach 2:
The patent combines the antireflection function with the existing manufacturing process by integrating the antireflection layer formation into the standard display device fabrication sequence, eliminating the need for separate polarizer assembly steps and reducing overall manufacturing complexity
3Illumination intensity
If more power is used to compensate for brightness loss, then brightness is maintained, but lifetime of the light emitting portion is reduced
Solution Approach 1:
The patent converts the harmful effect of outside light reflection into a beneficial design feature by using the reflected light waves themselves in the antireflection layer to create destructive interference, thereby canceling out reflections without needing to increase the organic light emitting diode's power output and preserving its lifetime
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 antireflection layer enhances brightness, extends the lifetime of the organic light emitting diode display device, and lowers manufacturing costs by eliminating the need for expensive polarizers, while maintaining outer visibility.
Implementation Method 1
an antireflection layer comprising a metallic layer and an insulating layer, which minimizes outside light reflection through absorption and destructive interference
Implementation Method 2
an antireflection layer comprising a metallic layer and an insulating layer, which minimizes outside light reflection through absorption and destructive interference
Data Source
AI summary
An organic light emitting diode display device includes a substrate; an antireflection layer on a first surface of the substrate and including a metallic layer and an insulating layer; a driving element portion on the antireflection layer and including thin film transistors and metallic lines; and an organic light emitting portion driven by the driving element portion.