Red Micro LED Panel Using UV Quantum Dot Conversion for Higher EQE
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Solution Overview
Problem
The external quantum efficiency (EQE) of micro LED display devices, particularly red micro LEDs, decreases as the device size minimizes, and existing methods to improve EQE, such as using mixed materials or nanopillar structures, are costly and inefficient.
Innovation Solution
A red micro LED display panel is designed with a driving backplane, an electrode array, a UV micro LED, and a red quantum dot layer, where the UV micro LED emits light in the range of 405 nm to 430 nm to enhance the conversion efficiency of quantum dots, and includes a light shielding layer with spacers and a Bragg reflection layer to optimize light usage and purity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the size of the display device is minimized, then the device becomes more compact and portable, but the external quantum efficiency (EQE) of the red micro LED decreases
Solution Approach 1:
The patent changes the wavelength parameter of the LED light source from conventional visible light to ultraviolet range (405-430 nm). This parameter change enables the UV micro LED to maintain high EQE even at miniaturized sizes while effectively exciting the red quantum dot layer, resolving the contradiction between device miniaturization and efficiency maintenance
Solution Approach 2:
The patent introduces a red quantum dot layer as an intermediary between the UV micro LED and the display output. The quantum dots convert the UV light to red light with high efficiency, allowing the system to achieve both miniaturization and high EQE by decoupling the LED size constraints from the final light output efficiency
2Reliability
If mixed materials or nanopillar structures are used to improve red micro LED EQE, then the efficiency can be enhanced, but the manufacturing cost increases and yield decreases
Solution Approach 1:
The patent replaces expensive and complex mixed material compositions or nanopillar structures with a simpler UV micro LED approach combined with a red quantum dot layer. This substitution uses more readily manufacturable components and processes, significantly reducing manufacturing cost and improving yield while maintaining high EQE
Solution Approach 2:
Instead of modifying the material composition or physical structure of the LED itself (which increases complexity), the patent changes the operational parameter (wavelength) to UV range. This parameter change enables high efficiency through a simpler, more manufacturable structure that avoids the complexity and cost issues of mixed materials or nanopillar fabrication
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 configuration enhances the conversion efficiency and stability of quantum dots, ensuring sufficient EQE for full-color display devices by optimizing the use of UV light and reducing manufacturing complexity.
Implementation Method 1
The UV micro LED is configured to emit an UV light, and a wavelength of the UV light is in a range from 405 nm to 430 nm
Implementation Method 2
the red micro LED display panel includes a Bragg reflection layer located on the red quantum dot layer
Data Source
AI summary
The present disclosure provides a red micro LED display panel applied in a separated panel display device. The red micro LED display panel includes a driving back plane, an electrode array, a UV micro LED, and a red quantum dot layer. The electrode array is located on the driving back plane. The UV micro LED is located on the electrode array. The red quantum dot layer is located on the UV micro LED.