Segmented LED Epitaxial Structure for Low-Crosstalk Color Pixels
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Solution Overview
Problem
Existing LED structures face challenges in achieving high-definition displays with reduced light crosstalk, especially as pitch requirements decrease and pixel densities increase.
Innovation Solution
A single light emitting diode (LED) structure with multiple controllable emitting zones, each configured to emit a specific wavelength, is designed with geometrically defined and electrically configured effective emission areas to control light intensity and color. Additionally, a shielding hole in the substrate between emitting zones further reduces light crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LEDs with various colors are packaged together to produce desired spectra, then color variety is improved, but device complexity and packaging cost increase
Solution Approach 1:
The single LED chip is divided into multiple discrete emitting zones (first emitting zone, second emitting zone, third emitting zone) with different effective emission areas. Each zone emits a specific color (red, green, blue) and can be independently controlled to produce desired spectra without requiring multiple separate LED packages
Solution Approach 2:
Multiple emitting zones with different colors are integrated into a single LED chip structure rather than packaging separate LEDs together. The zones share common substrate, electrodes, and packaging, reducing overall device complexity while maintaining color variety
2Measurement precision
If pixel density is increased for high-definition displays, then image quality is improved, but light crosstalk between pixels increases
Solution Approach 1:
The LED chip is segmented into multiple discrete emitting zones with clearly defined boundaries and effective emission areas. This segmentation allows high pixel density while maintaining spatial separation between light sources to minimize crosstalk
Solution Approach 2:
Each emitting zone has a specifically defined effective emission area with optimized geometry tailored to its function. The varying sizes and shapes of different zones allow precise control over light distribution patterns, reducing interference between adjacent zones
3Productivity
If emitting zones are placed closer together to reduce pitch, then pixel density is improved, but light crosstalk between zones increases
Solution Approach 1:
The chip is divided into discrete emitting zones with controlled spacing. Even at reduced pitch, the segmentation maintains distinct light emission regions that can be independently controlled, preventing excessive crosstalk while achieving high pixel density
Solution Approach 2:
The patent controls light crosstalk not only through horizontal spacing but also through vertical structure design and effective emission area configuration. By optimizing the three-dimensional light distribution characteristics, crosstalk is reduced even when zones are placed closer together
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
The solution enables the production of high-definition images with reduced light crosstalk, allowing for simpler and cost-effective packaging of LED displays with advanced pixel volumes and densities.
Implementation Method 1
one or more wavelength conversion members in selected emission zones for converting the emitting light to a different color to produce a desired color spectrum
Data Source
AI summary
A single light emitting diode (LED) structure includes an array of spaced discrete light emitting zones separated by isolation areas. Each emitting zone includes an epitaxial structure configured to emit an emitting light having a particular wavelength over an effective emission area. In addition, the effective emission area for each emitting zone can be geometrically defined and electrically configured to provide a desired light intensity. For example, each effective emission area can have a selected size and spacing depending on the application and light intensity requirements. Each emitting zone also includes a wavelength conversion member on its effective emission area configured to convert an emitting wavelength of the emitting light to a different color. The single (LED) structure can include multiple colors at different zones to produce a desired spectra or design. The single (LED) structure can also include a substrate for supporting the array, and the substrate can include one or more light shielding holes located between each emitting zone.