OLED Polarization Layer Spatial Transmittance for Contrast and Efficiency
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Solution Overview
Problem
Organic light emitting diode (OLED) display devices experience a significant decrease in contrast due to external light, which is mitigated by polarization layers but at the cost of reduced light emission efficiency, and increased reflectance.
Innovation Solution
A display device with a polarization layer having different single transmittances for subpixels, where the second area has a higher transmittance than the first area, positioned in emission and non-emission areas respectively, to minimize reflectance increase and enhance light transmission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a polarization layer is attached to block external light reflection, then contrast is improved, but light emission efficiency decreases to less than half
Solution Approach 1:
The polarization layer is designed with spatially varying transmittance properties, where different regions have different transmittance values. Specifically, the transmittance is adjusted according to the position relative to the emission area, allowing optimal balance between blocking external light and transmitting emitted light from different subpixel regions.
2Use of energy by moving object
If the single transmittance of the polarization layer is increased to improve light emission efficiency, then light transmission is improved, but reflectance by external light increases
Solution Approach 1:
Different regions of the polarization layer have different transmittance values optimized for their specific functions. Regions overlapping with emission areas have higher transmittance to allow emitted light to pass efficiently, while other regions have lower transmittance to block external light and reduce reflectance, achieving local optimization of both parameters.
3Ease of manufacture
If a polarization layer with uniform transmittance is used, then manufacturing is simplified, but both light emission efficiency and reflectance control are compromised
Solution Approach 1:
The transmittance parameter of the polarization layer is varied spatially rather than being uniform. By changing the transmittance parameter across different regions of the layer, the invention achieves optimized light emission efficiency and reflectance control while maintaining a relatively simple single-layer structure that can be manufactured using conventional techniques.
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 reduces power consumption, improves the lifespan of light emitting elements, and maintains low power consumption while minimizing reflectance and maximizing light transmission efficiency.
Implementation Method 1
a polarization layer for blocking a reflection of the external light is attached onto a substrate from which light is emitted
Implementation Method 2
an organic light emitting diode (OLED) device, being a self-luminous display device
Data Source
AI summary
Discussed is a display device including a substrate including a plurality of subpixels, each subpixel including an emission area and a non-emission area; a polarization layer disposed on the substrate, and including a first area and a second area having single transmittances; and an organic light emitting element disposed in the emission area, wherein a single transmittance of the second area is higher than a single transmittance of the first area from among the single transmittances.