Micro LED Reflective Plate Structure for Easier Light Extraction
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Solution Overview
Problem
Existing display apparatuses face challenges in achieving high light extraction efficiency, process optimization, and maintaining pixel integration while requiring high power consumption and resolution.
Innovation Solution
The display apparatus includes a substrate with a pixel driving circuit, insulating layers, banks, micro LEDs, a diffusion layer with a concave portion, and a reflective plate to enhance light emission efficiency, minimize unnecessary space, and optimize processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a reflective plate is disposed around each micro LED to improve light extraction efficiency, then light emission efficiency is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
Multiple micro LEDs share a common reflective plate instead of each having an individual reflective plate. This merging approach maintains the light extraction efficiency benefits while reducing the total number of reflective plates needed, thereby simplifying the device structure and reducing manufacturing complexity
Solution Approach 2:
The common reflective plate serves multiple micro LEDs simultaneously, performing the same light extraction function for each. This multi-functional approach eliminates redundant components and simplifies the overall device structure while maintaining high light emission efficiency across all micro LEDs
2Productivity
If micro particles are used in the side wall diffusion layer to improve light extraction, then light emission efficiency is improved, but process difficulty increases
Solution Approach 1:
The invention removes the side wall diffusion layer containing micro particles from the structure entirely. By extracting this problematic component, the patent eliminates the associated manufacturing difficulties while maintaining light extraction efficiency through the common reflective plate approach
Solution Approach 2:
The invention replaces the complex micro particle-based side wall diffusion layer with a simpler, more manufacturable structure using standard semiconductor fabrication processes, effectively substituting a difficult-to-manufacture component with an easier alternative
3Illumination intensity
If high luminance and high resolution are implemented, then display quality is improved, but power consumption increases
Solution Approach 1:
The invention changes the optical parameters of the system by introducing a common reflective plate that redirects light more efficiently. This parameter change improves light extraction efficiency, allowing the display to achieve high luminance at lower power consumption levels by reducing light loss in the optical path
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
Improves light emission efficiency, reduces process complexity, and allows for high luminance and resolution while operating at low power consumption.
Implementation Method 1
a reflective plate disposed on the concave portion
Data Source
AI summary
Provided is a display apparatus. The display apparatus includes a substrate, a pixel driving circuit disposed on the substrate, a plurality of insulating layers disposed on the pixel driving circuit, a bank disposed on the plurality of insulating layers, a plurality of micro LEDs which is disposed on the bank, and is electrically connected to the pixel driving circuit, a diffusion layer which is disposed so as to enclose the bank and the plurality of micro LEDs on the plurality of insulating layers and includes a concave portion disposed along a boundary of the bank, and a reflective plate disposed on the concave portion. Accordingly, the light emission efficiency may be improved while alleviating the process difficulty so that the process optimization may be implemented.