Single Phosphor Layer Photonic Device for LED Displays
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Solution Overview
Problem
LED displays face challenges in achieving high resolution and uniform color temperature due to the aging of separate LEDs at different rates, leading to inconsistent brightness and color temperature changes.
Innovation Solution
An integrated photonic device is fabricated using a single substrate with multiple LEDs, each controlled individually, where the LEDs share a common light-emitting structure and optional phosphor layers to generate a full spectrum of colors, including white light, by varying the voltage applied across the p-n junction and using phosphors to convert wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate LEDs are used to generate full spectrum colors, then color variety is improved, but manufacturing uniformity and aging consistency deteriorate
Solution Approach 1:
The invention segments the phosphor conversion function into multiple distinct phosphor layers, each with specific wavelength conversion properties. This allows precise control over the spectral output while maintaining uniform aging characteristics since all phosphors are deposited on the same LED chip structure, ensuring they experience identical operating conditions and degrade at similar rates.
Solution Approach 2:
The invention employs composite phosphor layer structures where multiple phosphor materials with different emission characteristics are stacked in sequence. Each layer converts specific wavelengths, and the combination produces a full-spectrum output. This composite approach enables tailored spectral distribution while maintaining manufacturing uniformity through integrated deposition processes.
2Manufacturing precision
If multiple phosphor layers are used to generate white light, then spectral quality is improved, but manufacturing complexity increases
Solution Approach 1:
The invention merges multiple phosphor deposition processes into a single integrated manufacturing flow. All phosphor layers are deposited sequentially on the same LED chip in one manufacturing cycle, sharing common process parameters and equipment. This integration maintains high spectral quality through precise layer control while reducing overall manufacturing complexity compared to separate processing steps.
Solution Approach 2:
The invention creates a universal phosphor layer structure that can be applied to various LED chip types and configurations. The same multi-layer phosphor deposition methodology works across different LED platforms, enabling consistent spectral quality achievement without requiring complex, application-specific manufacturing procedures for each case.
3Ease of operation
If separate LEDs with individual optics are used, then color control is improved, but device resolution deteriorates
Solution Approach 1:
The invention merges multiple color generation functions into a single LED chip by stacking multiple phosphor layers that convert the LED's emission into different wavelength bands. This integration eliminates the need for separate LEDs and their associated optics, reducing the pixel footprint and enabling higher display resolution while maintaining precise color control through phosphor layer composition and thickness adjustments.
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 enhances manufacturing uniformity and extends the useful life of LED displays by allowing for precise control of color temperature and brightness, reducing variations across the display and compensating for aging issues.
Implementation Method 1
the optional phosphor material changes the properties of light generated by the LED
Implementation Method 2
An LED emits light when a voltage is applied across a p-n junction formed by oppositely doping semiconductor compound layers
Data Source
AI summary
A photonic device generates light from a full spectrum of lights including white light. The device includes two or more LEDs grown on a substrate, each generating light of a different wavelength and separately controlled. A light-emitting structure is formed on the substrate and apportioned into the two or more LEDs by etching to separate the light-emitting structure into different portions. At least one of the LEDs is coated with a phosphor material so that different wavelengths of light are generated by the LEDs while the same wavelength of light is emitted from the light-emitting structure.