Stacked Multi-Color LED Pixels for High-Resolution Displays
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Solution Overview
Problem
Conventional color displays using red, green, and blue LEDs are complex and costly, making them unsuitable for high-resolution, low-power, and low-cost applications, particularly in portable devices like smartphones and virtual/augmented reality headsets.
Innovation Solution
A color stacked light emitting diode (LED) pixel structure is developed, where a base LED, an intermediate LED, and a top LED are stacked on a substrate, allowing for the creation of high-brightness, high-resolution color displays using a single substrate, reducing manufacturing complexity and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional color displays use separate red, green, and blue LEDs with color phosphors, color filters, and down convertors, then color display functionality is achieved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent merges multiple separate LED components (red, green, and blue LEDs) into a single integrated LED structure. This is achieved by stacking multiple quantum well structures with different bandgaps within one LED device, allowing all three primary colors to be generated from a single light source rather than requiring separate LEDs, phosphors, and filters for each color.
Solution Approach 2:
The patent creates a universal LED structure that performs multiple functions simultaneously. A single LED device generates red, green, and blue light through its stacked quantum well design, eliminating the need for separate color-generating components. This multi-functional approach reduces the overall number of parts and simplifies the display structure.
2Device complexity
If conventional color displays use multiple materials and components for different color LEDs, then color display is achieved, but manufacturing complexity increases
Solution Approach 1:
The patent combines multiple quantum well structures with different materials (e.g., InGaN with varying indium compositions) into a single stacked LED device. This integration allows all color-generating layers to be fabricated together in one manufacturing process rather than requiring separate fabrication processes for each color component.
Solution Approach 2:
The patent employs composite material structures within the LED, stacking multiple quantum well layers with different compositional ratios (e.g., different indium gallium nitride compositions). These composite material layers are grown sequentially in a single epitaxial process, enabling multi-color light emission from a unified material structure.
3Illumination intensity
If conventional color displays use separate components for each color LED, then color display functionality is achieved, but resolution and brightness performance deteriorate
Solution Approach 1:
The patent merges multiple color-generating quantum well structures into a single compact LED pixel. This integration increases the light output density per pixel area since all three colors are generated within one device structure rather than being distributed across multiple separate components, thereby enhancing overall brightness and 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
This approach enables the production of cost-effective, high-resolution color displays with reduced complexity, suitable for portable devices, by integrating multiple color LEDs on a single substrate, enhancing brightness and resolution while minimizing power consumption.
Implementation Method 1
The color stacked LED pixel includes an LED pixel structure body, a base LED disposed on at least a portion of the LED pixel structure body, an intermediate LED disposed on the base LED and a top LED disposed on the intermediate LED
Data Source
AI summary
A color stacked light emitting diode (LED) pixel is disclosed. The color stacked LED includes an LED pixel structure body, a base LED disposed on at least a portion of the LED pixel structure body, an intermediate LED disposed on the base LED, and a top LED disposed on the intermediate LED. The stacked LED may be an overlapping or a non-overlapping LED pixel. The LED pixel structure body may be a fin body or a nanowire body.