Micro-LED Display Electrode Structure for Reflection and Heat Control
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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 temperature rise, particularly when using micro-LEDs and mini-LEDs, and existing reflection suppression methods either lower resolution or generate heat.
Innovation Solution
A display device with a first reflection control layer having different reflectance and sheet resistance surfaces, and a second electrode made of transparent conductive film, combined with a stacked structure of metal and semiconductor materials to reduce external light reflection and dissipate heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a reflection suppressing layer is formed on the light-emitting surface, then external light reflection is suppressed, but the resolution is lowered
Solution Approach 1:
The reflection control layer is designed with spatially varying properties: the first region (overlapping the light-emitting element) has different reflectance characteristics than the second region (non-overlapping area). This local differentiation allows the first region to minimize reflection interference with the light-emitting element, preserving resolution, while the second region provides overall reflection suppression for the display device.
Solution Approach 2:
The reflection control layer is divided into two distinct regions with different optical properties. The first region has lower reflectance to prevent interference with the light-emitting element's optical output, while the second region has higher reflectance to suppress external light reflection from the display device surface, thus resolving the contradiction between reflection suppression and resolution maintenance.
2Object-affected harmful factors
If a reflection suppressing layer is formed on the light-emitting surface, then external light reflection is suppressed, but temperature rise occurs
Solution Approach 1:
The reflection control layer exhibits spatially varying thermal properties: the first region has lower heat generation to prevent temperature rise near the sensitive light-emitting element, while the second region has higher heat generation characteristics that are acceptable in non-overlapping areas. This local differentiation suppresses external light reflection while minimizing thermal interference with the light-emitting element.
Solution Approach 2:
The reflection control layer is segmented into two regions with different thermal characteristics. The first region is designed to generate less heat to protect the light-emitting element from thermal damage, while the second region can tolerate higher heat generation, thus achieving external light reflection suppression without causing harmful temperature rise.
3Manufacturing precision
If micro-LEDs and mini-LEDs are used, then display resolution is improved, but external light reflection and temperature rise are exacerbated
Solution Approach 1:
The reflection control layer is designed with region-specific optical properties where the first region (overlapping micro/mini-LEDs) has optimized reflectance to minimize external light reflection interference with the high-resolution display, while the second region provides additional reflection suppression. This local differentiation preserves the resolution benefits of micro/mini-LEDs while mitigating their susceptibility to external light reflection.
4Ease of manufacture
If a uniform reflection control layer is used, then manufacturing is simplified, but light utilization efficiency is reduced
Solution Approach 1:
The reflection control layer employs spatially varying optical properties with the first region optimized for light emission areas and the second region for non-emission areas. This local differentiation maximizes light utilization efficiency by allowing different reflectance characteristics in different regions, while still maintaining relatively simple manufacturing processes compared to more complex multi-layer structures.
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, improves visibility, and maintains brightness by reducing heat generation, enhancing light utilization efficiency and device reliability.
Implementation Method 1
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.
Implementation Method 2
A display device with a first reflection control layer having different reflectance and sheet resistance surfaces, and a second electrode made of transparent conductive film, combined with a stacked structure of metal and semiconductor materials to reduce external light reflection and dissipate heat.
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.