Micro-LED Display Reflection Control Layer for Heat and Visibility
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Solution Overview
Problem
Existing display devices using light-emitting elements face issues with external light reflection, which reduces resolution and causes heat buildup, particularly in micro-LED and mini-LED configurations, leading to decreased brightness and reliability.
Innovation Solution
A display device with a first reflection control layer having different reflectance and sheet resistance surfaces, stacked with metal and semiconductor materials, reduces external light reflection through optical interference and thermal conductivity, improving light utilization and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a reflection suppressing layer is formed to suppress external light reflection, then visibility and resolution are improved, but heat dissipation becomes insufficient leading to brightness degradation
Solution Approach 1:
The reflection suppressing layer is constructed as a composite material combining a resin base material with inorganic particles (such as silica, alumina, or titanium oxide). This composite structure enables simultaneous achievement of optical interference for reflection suppression and thermal conduction for heat dissipation, resolving the contradiction between improving visibility and maintaining heat dissipation capability
Solution Approach 2:
The refractive index of the reflection suppressing layer is specifically controlled to be lower than that of the light-emitting element (e.g., micro-LED or mini-LED). By optimizing the refractive index parameter of the layer and adjusting the type and concentration of inorganic particles, the structure achieves effective optical interference to suppress external light reflection while maintaining sufficient heat dissipation through the thermally conductive particles
2Manufacturing precision
If the light-emitting element size is reduced to micro-LED or mini-LED, then display resolution is improved, but heat buildup increases causing brightness degradation
Solution Approach 1:
The reflection suppressing layer acts as an intermediary structure between the light-emitting element and the external environment. It serves dual functions: optically, it suppresses external light reflection through interference; thermally, it facilitates heat dissipation from the miniaturized light-emitting element through thermally conductive inorganic particles, thereby resolving the heat buildup issue in high-resolution displays
Solution Approach 2:
By using composite materials consisting of resin and thermally conductive inorganic particles, the reflection suppressing layer provides both optical interference capability for reflection suppression and thermal conduction pathways for heat dissipation, enabling miniaturized light-emitting elements to maintain brightness while achieving high display resolution
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 suppresses external light reflection, enhances visibility, and maintains brightness by dissipating heat, thereby improving the reliability and efficiency of micro-LED and mini-LED displays.
Implementation Method 1
a reflection suppressing layer 24 for suppressing a reflection of external light incident on light-emitting surfaces of the plurality of light-emitting elements
Implementation Method 2
A display device with a first reflection control layer having different reflectance and sheet resistance surfaces, stacked with metal and semiconductor materials, reduces external light reflection through optical interference and thermal conductivity, improving light utilization and heat dissipation
Data Source
AI summary
A display device includes a first electrode, and LED chip on the first electrode, an insulating layer embeds the first electrode, contacts a side surface of the LED chip, and exposes an upper surface, a second electrode having translucency in contact with an upper surface of the insulating layer and the upper surface of the LED chip, and a first reflection control layer on an upper surface of the second electrode and having a first opening in an area overlapping with the LED chip. The first reflection control layer has a first surface on a side of the second electrode and a second surface on opposite to the first surface, and a reflectance of the first surface is higher than a reflectance of the second surface.