OLED Capping Layer Refractive Patterns Light Collection
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Solution Overview
Problem
Conventional organic light emitting diode (OLED) displays face inefficiencies in light collection and luminous efficiency due to light being emitted away from color filters, leading to reduced display quality and handling reliability.
Innovation Solution
A capping layer with alternating high and low refractive patterns is introduced between the organic light emitting diode and the second substrate, which collects and redirects white light emitted by the organic emission layer towards the color filters, enhancing light transmission and aperture ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a conventional OLED structure is used without a capping layer, then the device structure is simple, but light is emitted away from color filters leading to reduced luminous efficiency
Solution Approach 1:
A capping layer with alternating high and low refractive index patterns is introduced as an intermediary component between the OLED and the color filter layer. This capping layer acts as an optical mediator that redirects light emitted by the OLED toward the color filters, improving light utilization efficiency without fundamentally changing the OLED structure itself.
Solution Approach 2:
The capping layer utilizes variations in refractive index parameters to control light propagation. By creating alternating patterns of high and low refractive index materials, the system exploits refraction parameter changes to redirect light paths toward the color filters, thereby improving luminous efficiency through optical parameter optimization.
2Productivity
If light is emitted in all directions from the organic emission layer, then the emission pattern is uniform, but a significant portion of light misses the color filters and is lost
Solution Approach 1:
The capping layer implements local quality variation through alternating high and low refractive index patterns positioned at specific locations corresponding to the OLED pixel structure. This localized refractive index modulation redirects light in specific regions toward the color filters, optimizing light transmission efficiency at critical locations where light redirection is most needed.
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 capping layer improves luminous efficiency and display quality by refracting and redirecting light towards the color filters, increasing the amount of light transmitted through the second substrate and enhancing the OLED's handling reliability.
Implementation Method 1
The capping layer includes a plurality of high refractive patterns separated from each other and corresponding to the first electrodes, and a low refractive pattern provided between neighboring high refractive patterns. The high refractive pattern may have a greater refractive index than the low refractive pattern.
Data Source
AI summary
An organic light emitting diode display includes a first substrate, an organic light emitting diode on the first substrate, a second substrate on the organic light emitting diode, and a capping layer between the second substrate and the organic light emitting diode. The capping layer collects light emitted from the organic light emitting diode, and the capping layer collects the light in a direction of the second substrate corresponding to the organic light emitting diode.