Display Device Shared Emissive Layer Insulating Refractive Index
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Solution Overview
Problem
The challenge lies in manufacturing high-resolution display devices with improved color quality and optical efficiency, particularly in arranging compact LED chips at precise positions, which is difficult due to the complex transfer technique required and exposure of active layers leading to light interference and degraded luminous efficiency.
Innovation Solution
A display device design featuring an emissive layer with a semiconductor structure, color converting layers, and insulating layers with specific refractive indices, along with reflective layers and electrodes, that minimizes light exposure and interference by using a shared active layer for multiple sub-pixels and internal reflection to enhance color quality and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If compact LED chips are used to manufacture high-resolution display devices, then the resolution is improved, but the manufacturing complexity increases due to the difficult transfer technique required to arrange compact LED chips at appropriate positions
Solution Approach 1:
The patent merges multiple LED chips into a single integrated LED structure where multiple active layers are formed on a common substrate. This integration eliminates the need for complex transfer techniques to arrange separate compact LED chips, as the entire multi-color LED structure is manufactured as one unit and then positioned on the display device.
Solution Approach 2:
The patent creates a universal LED structure that can emit multiple colors (red, green, blue) simultaneously through different active layers within the same chip. This multi-functional LED replaces the need for multiple separate single-color LED chips, simplifying the manufacturing process while maintaining high resolution.
2Illumination intensity
If active layers are exposed to light, then light emission occurs, but light interference and degraded luminous efficiency result
Solution Approach 1:
The patent segments the active layers into distinct regions, with light-emitting active layers positioned in specific areas and non-light-emitting active layers in other areas. This segmentation allows light to be emitted only from designated regions, preventing light interference and maintaining high luminous efficiency while still utilizing multiple active layers.
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 design improves luminous efficiency and color quality by reducing light interference among sub-pixels and facilitating easier manufacturing without the need for precise chip transfer, while maintaining high resolution and efficient light emission.
Implementation Method 1
an insulating layer arranged on the emissive layer, the refractive index of which is smaller than a refractive index of the emissive layer
Data Source
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AI summary
A display device includes a substrate 110, an emissive layer 120; a plurality of color converting layers 103R, 130G, 103B that share the emissive layer; and an insulating layer 154 provided between the emissive layer and the plurality of color converting layers and having a smaller refractive index than the emissive layer.