Display Device Insulation Layer Refractive Index Optimization
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Solution Overview
Problem
Display devices suffer from reduced light emission efficiency and display quality due to light being reflected and lost at interfaces between adjacent layers in their multi-layer structure.
Innovation Solution
A display device with a substrate hosting first, second, and third light emitting elements emitting different colors, and featuring a first insulation layer with openings, where the refractive index of a second insulation layer is higher than that of the first insulation layer, and the openings overlap specific light emitting elements in a plan view.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If light passes through multiple layers in the display device, then the screen can be displayed, but light is reflected and lost at interfaces between adjacent layers, reducing light emission efficiency
Solution Approach 1:
A resin layer is introduced as an intermediary between the light emitting element and the first insulation layer. This resin layer has a refractive index that is lower than both the light emitting element and the first insulation layer, creating a gradient refractive index structure that reduces optical impedance mismatch and minimizes light reflection at interfaces, thereby reducing light loss and improving light emission efficiency
Solution Approach 2:
The patent changes the refractive index parameter by introducing a resin layer with a specific refractive index range (1.3 to 1.5) between the light emitting element and the first insulation layer. This parameter modification creates a gradual transition in refractive index, reducing the abrupt change that causes reflection, and thus improves light transmission efficiency
2Adaptability or versatility
If a multi-layer structure is used in the display device, then the device can perform multiple functions, but light reflection at interfaces deteriorates display quality
Solution Approach 1:
The resin layer serves as an intermediary that optimizes optical performance while maintaining the multi-layer functional structure. By positioning this layer with specific refractive index characteristics, the patent preserves the benefits of multiple functional layers while minimizing optical interference and reflection that would degrade display quality
Solution Approach 2:
The patent applies different refractive index characteristics to different layers locally. The resin layer has a specifically controlled refractive index (1.3 to 1.5) that is optimized for reducing reflection, while other layers maintain their original properties. This local optimization of material properties improves overall display quality without compromising functional integration
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 improves light emission efficiency and display quality by optimizing the refractive indices and positioning of the insulation layers, thereby reducing light loss and enhancing front light emission.
Implementation Method 1
a refractive index of the second insulation layer is higher than a refractive index of the first insulation layer
Implementation Method 2
some of the light generated by the light emitting element may be reflected and lost by an interface between adjacent layers
Data Source
AI summary
A display device includes a first light emitting element, a second light emitting element, and a third light emitting element that are disposed on a substrate and emitting light of different colors, respectively; a first insulation layer disposed on the first light emitting element, the second light emitting element, and the third light emitting element, and including at least one opening; and a second insulation layer disposed on the first insulation layer, and disposed in the at least one opening, wherein a refractive index of the second insulation layer is higher than a refractive index of the first insulation layer, and the at least one opening overlaps at least one of the first light emitting element, the second light emitting element, and the third light emitting element in a plan view, and does not overlap at least another one in a plan view.