Pixel Structure With Refractive Index Layer for Light Conversion
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Solution Overview
Problem
Existing display technologies face issues with deterioration of the light conversion layer and reduced light efficiency due to heat and light generated from the light emitting part.
Innovation Solution
Incorporating a first layer with a refractive index equal to or less than that of the insulating layers, positioned between the light emitting part and the light conversion layer, to protect the light conversion layer from heat and light, thereby reducing deterioration and enhancing light efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the light conversion layer is disposed directly on the light emitting part, then the light efficiency is improved by reducing light loss, but the light conversion layer deteriorates due to heat and light from the light emitting part
Solution Approach 1:
A first layer is introduced as an intermediary between the light emitting part and the light conversion layer. This first layer has a refractive index equal to or less than that of the insulating layers, serving as a protective mediator that reduces the harmful effects of heat and light from the light emitting part on the light conversion layer, while still maintaining adequate light transmission efficiency.
Solution Approach 2:
The first layer acts as a sacrificial protective layer that can be easily damaged or degraded before the light conversion layer. By positioning this vulnerable layer between the light emitting part and the light conversion layer, the light conversion layer is protected from direct exposure to harmful conditions, effectively extending its operational life.
2Reliability
If a protective layer is added between the light emitting part and the light conversion layer, then the light conversion layer is protected from deterioration, but the light efficiency may be reduced due to additional light loss
Solution Approach 1:
The refractive index of the first layer is specifically controlled to be equal to or less than that of the insulating layers. This parameter optimization ensures that the first layer minimizes optical interference and light loss while still providing the necessary protective function against heat and light from the light emitting part.
Solution Approach 2:
The first layer is positioned specifically in the region between the light emitting part and the light conversion layer, providing localized protection where the light conversion layer is most vulnerable. This targeted approach ensures protection is applied only where needed, minimizing overall impact on light efficiency.
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 effectively protects the light conversion layer, improving the reliability and light efficiency of the pixel and display device by increasing the amount of light incident on the conversion layer.
Implementation Method 1
A refractive index of the first layer may be equal to or less than a refractive index of the at least one insulating layer
Data Source
AI summary
An embodiment provides a display device including a pixel disposed in a display area. The pixel includes a light emitting part that includes a light emitting element, pixel electrodes disposed on a first end portion and a second end portion of the light emitting element, and at least one insulating layer, a light conversion layer disposed on the light emitting part, the light conversion layer including light conversion particles, and a first layer disposed between the light emitting part and the light conversion layer. A refractive index of the first layer is equal to or less than a refractive index of the at least one insulating layer.