Electrophoretic Conversion Layer for LED Subpixel Precision
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Solution Overview
Problem
Existing methods for producing optoelectronic semiconductor chips struggle to apply conversion layers to small subpixel regions to produce different colors effectively, particularly in achieving precise wavelength conversion for blue light emission.
Innovation Solution
A method involving the deposition of an electrically conductive layer on subpixel regions, followed by an electrophoretic application of luminescent material particles to create a conversion layer, which converts blue light into other wavelengths like green or red, using a process that allows for localized application and chemical inertness to maintain conductivity and optical transparency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional deposition methods are used to apply conversion layers, then the process is simple, but precise application to small subpixel regions is difficult
Solution Approach 1:
The patent segments the deposition process by applying electrically conductive layers selectively to specific subpixel regions before electrophoretic deposition. This segmentation allows precise control of where conversion layers are deposited, enabling accurate application to small subpixel regions while maintaining a manageable process complexity through standardized electrophoresis equipment.
Solution Approach 2:
The patent implements local quality by creating electrically conductive layers with different properties in different subpixel regions. Each subpixel region receives a tailored conductive layer configuration that enables precise electrophoretic deposition of conversion layers only where needed, achieving high manufacturing precision for small subpixel regions.
2Manufacturing precision
If conversion layers are applied to small subpixel regions, then color precision is improved, but deposition uniformity deteriorates
Solution Approach 1:
The patent applies equipotentiality by ensuring that the electrically conductive layers in different subpixel regions are at the same electrical potential during electrophoretic deposition. This equipotential condition ensures uniform electric field distribution across small subpixel regions, enabling uniform conversion layer deposition while maintaining precise color emission characteristics.
3Reliability
If thick electrically conductive layers are used, then charge transport is sufficient, but optical transparency is reduced
Solution Approach 1:
The patent uses parameter changes by controlling the thickness and material composition of electrically conductive layers to optimize the balance between charge transport and optical transparency. The conductive layers are designed with specific thickness parameters that provide sufficient charge transport for electrophoretic deposition while maintaining adequate optical transparency for light outcoupling from the LED.
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
Enables the production of semiconductor chips with precise color emission capabilities by efficiently converting blue light into green or red light, enhancing charge transport and light outcoupling while maintaining electrical conductivity and optical transparency.
Implementation Method 1
A conversion layer is deposited on the electrically conductive layer by an electrophoresis process
Implementation Method 2
The conversion layer is suitable for converting electromagnetic radiation of the first wavelength range into radiation of a second wavelength range
Implementation Method 3
the electrically conductive layer is suitable at least in part for forming a salt with a protic reactant
Data Source
AI summary
A method for producing an optoelectronic semiconductor chip is disclosed. A semiconductor body has a pixel area, which has at least two different subpixel areas. An electrically conductive layer is applied to the radiation outlet surface of at least one subpixel area. The electrically conductive layer is designed to at least partially salify with a protic reaction partner. A conversion layer is deposited onto the electrically conductive layer by means of a electrophoresis process.