OLED Optical Unit Polarization Segmentation
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Solution Overview
Problem
Conventional OLED displays face challenges in minimizing light loss and suppressing external light reflection, which affect visibility and efficiency, due to the lack of effective optical units that optimize light emission and absorption.
Innovation Solution
The proposed optical unit consists of a first polarizing plate with higher transmittance and lower polarization degree, a second polarizing plate with higher polarization degree, and strategically positioned phase shift plates, arranged to minimize light loss and external reflection by adjusting polarization axes and optical axes angles, thereby enhancing light emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional optical unit uses a single polarizing plate with high polarization degree, then external light reflection is suppressed, but light loss from the organic emission layer increases
Solution Approach 1:
The optical unit is segmented into multiple functional layers: a first polarizing plate with lower polarization degree (higher transmittance) close to the emission layer, and a second polarizing plate with higher polarization degree farther away. This segmentation allows each layer to perform its function optimally - the first plate minimizes light loss while the second plate suppresses external reflection
Solution Approach 2:
The first polarizing plate acts as an intermediary between the organic emission layer and the second polarizing plate. It has lower polarization degree to allow more light to pass through from the emission layer, while still working with the second plate to suppress external light reflection, thus mediating between light emission efficiency and reflection suppression
2Object-affected harmful factors
If a polarizing plate with high polarization degree is used, then external light reflection is suppressed, but visibility and light emission efficiency deteriorate
Solution Approach 1:
The optical unit divides the polarization function into two separate plates with different polarization degrees. The first plate has lower polarization degree to maintain high light emission efficiency and visibility, while the second plate has higher polarization degree to suppress external light reflection, resolving the contradiction between these two requirements
Solution Approach 2:
Different regions of the optical unit have different polarization characteristics. The first polarizing plate (closer to emission layer) has lower polarization degree for high light transmission, while the second polarizing plate (farther from emission layer) has higher polarization degree for reflection suppression, optimizing local properties for different functions
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
This configuration effectively suppresses external light reflection and minimizes light loss, improving the visibility and efficiency of OLED displays by efficiently emitting light from the organic emission layer, reducing power consumption, and extending the display's lifespan.
Implementation Method 1
a first polarizing plate on the light emitting unit, a second polarizing plate on the first polarizing plate, the second polarizing plate having a higher polarization degree than the first polarizing plate
Implementation Method 2
a plurality of phase shift plates between the first polarizing plate and the second polarizing plate
Implementation Method 3
arranged to minimize light loss and external reflection by adjusting polarization axes and optical axes angles
Data Source
AI summary
An optical unit on a light emitting unit includes a first polarizing plate on the light emitting unit, a second polarizing plate on the first polarizing plate, the second polarizing plate having a higher polarization degree than the first polarizing plate, and a plurality of phase shift plates between the first polarizing plate and the second polarizing plate.