LED Chromaticity Control via Fluorescent Sheet Depression
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Solution Overview
Problem
The existing method for manufacturing semiconductor light-emitting elements requires preparing multiple fluorescent sheets with different characteristics and uniform peak wavelengths, making it inefficient for chromaticity adjustment.
Innovation Solution
A method where LED dies with identical emission wavelength distributions are arranged on a single fluorescent sheet, and the amount of depression into the sheet is adjusted to achieve desired color emission, eliminating the need for multiple sheets and uniform peak wavelengths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If multiple fluorescent sheets with different characteristics are prepared for chromaticity adjustment, then the desired color emission can be achieved, but the production complexity and preparation time increase
Solution Approach 1:
The patent changes the parameter of fluorescent sheet thickness to achieve chromaticity adjustment. By controlling the thickness of a single fluorescent sheet, different color emissions can be obtained without needing multiple sheets with different characteristics. This resolves the contradiction by maintaining chromaticity adjustment precision while reducing production process complexity.
Solution Approach 2:
The patent introduces a recess portion in the fluorescent sheet that corresponds to the LED die position, creating a dynamic adjustment mechanism. The LED die is depressed into this recess to control the amount of fluorescent material in contact with the die, thereby adjusting chromaticity. This dynamic approach eliminates the need for multiple static fluorescent sheets with different characteristics.
2Manufacturing precision
If fluorescent sheets with uniform peak wavelengths are used, then consistent color emission can be achieved, but the adaptability to different LED die characteristics is reduced
Solution Approach 1:
The patent creates a local recess portion in the fluorescent sheet at the LED die position, allowing local adjustment of fluorescent material thickness without affecting the overall uniformity of the fluorescent sheet. This local quality change enables consistent color emission while adapting to different LED die characteristics, as the recess depth can be optimized for each LED type.
3Manufacturing precision
If multiple fluorescent sheets are prepared in advance, then chromaticity adjustment is possible, but the production time and preparation steps increase
Solution Approach 1:
The patent extracts the chromaticity adjustment function from multiple fluorescent sheets and concentrates it into a single fluorescent sheet with a recess portion. This extraction eliminates the need to prepare and manage multiple sheets, thereby improving production efficiency while maintaining chromaticity control capability.
Solution Approach 2:
The recess portion is pre-formed in the fluorescent sheet before LED die mounting. This preliminary action allows for automatic chromaticity adjustment during the standard mounting process, eliminating the need for additional preparation steps and multiple sheets, thus improving production efficiency.
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 method allows for chromaticity adjustment without preparing multiple fluorescent sheets, reducing production complexity and costs, while ensuring consistent color emission.
Implementation Method 1
the LED die emits blue or near ultraviolet light, and white light is produced, in many cases, by utilizing the wavelength conversion effect of the fluorescent layer
Data Source
AI summary
The invention is directed to the provision of a method for manufacturing a semiconductor light-emitting element that eliminates the need for preparing a plurality of different fluorescent sheets. The method for manufacturing the semiconductor light-emitting element containing an LED die includes the steps of arranging the LED die on a fluorescent sheet containing a fluorescent substance and adjusting the amount by which the LED die is depressed into the fluorescent sheet so that the semiconductor light-emitting element has a desired color emission.