Multi-color LED Pixel Unit Vertical Stacking
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Solution Overview
Problem
Conventional LED display panels require complex and costly processes to assemble multiple color LEDs, leading to increased power consumption and decreased luminance and color accuracy.
Innovation Solution
A multi-color light emitting pixel unit is developed, featuring a substrate with light emitting transistors having a bottom conductive layer, an upper conductive layer, and multiple light emitting layers, where each transistor shares the same conductive layers but has distinct light emitting layers, allowing for simultaneous fabrication and electrical connection of different color LEDs on the same substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple color LEDs are assembled one by one on a substrate using conventional methods, then each LED can be individually bonded with metal wires or connecting electrodes, but the manufacturing process becomes complicated, processing difficulty increases, and production cost increases
Solution Approach 1:
The patent merges multiple individual LED assembly processes into a single integrated structure. Multiple light emitting layers (red, green, blue LEDs) are stacked vertically and share common conductive layers (anode and cathode), eliminating the need for separate metal wire bonding for each LED. This combining approach maintains individual LED functionality while dramatically simplifying the manufacturing process and reducing production costs.
2Ease of operation
If multiple color LEDs are assembled one by one on a substrate, then each LED can be individually positioned, but the assembly process time increases and productivity decreases
Solution Approach 1:
The patent implements preliminary action by pre-assembling multiple light emitting layers with their respective conductive structures into an integrated multi-color LED unit before mounting it to the substrate. The stacked structure with shared electrodes is prepared in advance, allowing for rapid placement and connection to the control circuit, thereby significantly improving assembly speed and productivity while maintaining precise positioning capability.
3Adaptability or versatility
If single LEDs are assembled one by one to form a multi-color display panel, then each LED can be independently controlled, but power consumption increases and luminance and color quality decrease
Solution Approach 1:
The patent applies universality by designing a shared conductive structure where common anode and cathode layers serve multiple light emitting layers simultaneously. The shared electrodes reduce redundant conductive paths and contact resistance, improving electrical efficiency and reducing power consumption. At the same time, the vertical stacking maintains independent control capability for each LED color through selective electrode connection.
4Manufacturing precision
If multiple color LEDs are assembled using conventional separate processes, then each LED type can be optimized individually, but the overall manufacturing cost increases and production efficiency decreases
Solution Approach 1:
The patent uses segmentation by dividing the multi-color LED into distinct light emitting layers (red, green, blue) with their own optimized semiconductor structures, while sharing common conductive infrastructure. Each light emitting layer can be independently designed and fabricated with optimal parameters for its specific wavelength, maintaining manufacturing precision. The shared conductive layers reduce overall material usage and simplify the bonding process, thereby reducing production costs.
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 approach simplifies the manufacturing process, reduces production costs, and enhances luminance and color accuracy by allowing for the simultaneous assembly of multiple color LEDs on a single substrate, improving the efficiency and quality of the micro-LED display panel.
Implementation Method 1
A light emitting diode (LED), which is a kind of semiconductor diode, can convert electrical energy into optical energy. Under a positive bias, holes flow from a P region into an N region and electrons flow from the N region into the P region, and the combination between the electrons in the N region and the holes in the P region produces spontaneous radiation of excitation light.
Data Source
AI summary
A multi-color light emitting pixel unit includes a substrate, and a light emitting transistor formed on the substrate. The light emitting transistor includes a bottom conductive layer formed on the substrate and a top conductive layer formed over the bottom conductive layer, an upper light emitting layer formed between the top conductive layer and the bottom conductive layer, at least one lower light emitting layer formed between the upper light emitting layer and the bottom conductive layer, and an electrical connector electrically connecting the at least one lower light emitting layer and the bottom conductive layer.