Display Device Insulation Layers Refractive Index Optimization
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Solution Overview
Problem
Display devices face challenges in improving light emission efficiency and display quality due to light being reflected and lost at interfaces between adjacent layers, leading to reduced front light emission efficiency.
Innovation Solution
A display device with a multi-layer structure including first, second, and third light emitting elements emitting different colors, and insulation layers with varying refractive indices to optimize light transmission and minimize reflection.
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 front light emission efficiency
Solution Approach 1:
The patent introduces a light guiding structure as an intermediary component between the light emitting element and the upper layers. This structure acts as a mediator to control and direct light propagation, reducing reflection losses at interfaces by providing a dedicated pathway for light to reach the front surface efficiently.
Solution Approach 2:
The light guiding structure extends in the vertical dimension (thickness direction of the display device) to capture light that would otherwise be lost at interfaces. By utilizing the vertical dimension, the structure redirects light toward the front surface, converting potentially lost lateral light into useful front-emitting light.
2Reliability
If insulation layers are added to isolate light emitting elements, then device structure is improved, but light transmission is blocked and reflection is increased
Solution Approach 1:
The patent segments the insulation function from the light blocking function by introducing a dedicated light guiding structure that is optically coupled to the light emitting element but spatially separated from the upper insulation layers. This segmentation allows the insulation layers to perform their electrical isolation function without completely blocking light, as the light guiding structure provides an alternative optical pathway.
Solution Approach 2:
The light guiding structure serves as an intermediary between the light emitting element and the insulation layers, allowing light to bypass the light-blocking portions of the insulation structure. It mediates the conflict between insulation requirements and light transmission by providing a specialized channel that maintains both electrical isolation and optical efficiency.
3Device complexity
If a multi-layer structure is used to achieve proper insulation and device function, then device complexity is reduced, but light emission efficiency deteriorates due to multiple interfaces
Solution Approach 1:
The patent merges the light guiding function with the existing multi-layer structure by integrating the light guiding structure into the insulation layer configuration. This combination allows the device to maintain its necessary electrical insulation layers while adding optical functionality, achieving both structural integrity and improved light emission efficiency without requiring entirely separate systems.
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 proposed solution enhances light emission efficiency and display quality by minimizing light loss through strategic insulation layer design, allowing more light to be emitted to the front.
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.