LED Filament With Multiple Die Types for Full-Spectrum Color Rendering
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Solution Overview
Problem
Conventional LED filaments using a single type of LED die produce limited color spectra and poor color rendering parameters, making them inadequate for applications requiring accurate color reproduction, such as photography and art studios.
Innovation Solution
LED filaments are designed with multiple types of LED dies arranged in staggered or linear configurations, utilizing multiple die bonding processes to emit a wider range of colors and achieve full spectrum light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple types of LED dies are used to achieve full spectrum light output, then color rendering quality is improved, but device complexity increases
Solution Approach 1:
The patent combines multiple types of LED dies (first plurality emitting in first wavelength range, second plurality emitting in second wavelength range) onto a single LED filament substrate. This merging of different light-emitting components on one substrate enables full spectrum light output with CRI≥95 while maintaining a unified device structure, resolving the contradiction between color rendering quality and device complexity
Solution Approach 2:
The LED filament is segmented into multiple functional zones with different types of LED dies arranged in staggered or linear patterns. Each segment emits specific wavelength ranges, and the segmented arrangement allows for optimized light output across the spectrum while maintaining manageable device complexity through modular design
2Adaptability or versatility
If multiple die bonding processes are used to place different LED dies, then color spectrum range is improved, but manufacturing complexity increases
Solution Approach 1:
The patent employs preliminary action by preparing range files that define bonding parameters for different LED die types before the actual bonding process. The first range file defines parameters for bonding LED dies of the first type, and the second range file defines parameters for bonding LED dies of the second type. This pre-programming of bonding parameters enables automated multi-type die placement with controlled manufacturing complexity
Solution Approach 2:
The patent utilizes parameter changes in the die bonding process by adjusting bonding parameters (temperature, pressure, time) according to the specific type of LED die being bonded. The range files contain optimized parameter sets for different die types, allowing the manufacturing process to adapt parameters dynamically while maintaining ease of manufacture through automated control
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 LED filaments to produce full spectrum light with improved color accuracy, achieving a color rendering index (CRI) greater than or equal to 95 and standard deviation color matching (SDCM) greater than or equal to 4, mimicking natural light sources.
Implementation Method 1
a first plurality of LED dies that emit light within a first range of wavelengths; a second plurality of LED dies that emit light within a second range of wavelengths
Data Source
AI summary
The present invention relates to a light emitting diode (LED) filament for use in filament lamps that outputs full spectrum light. In one aspect, the LED filament comprises a first plurality of LED dies that emit light within a first range of wavelengths and a second plurality of LED dies that emit light within a second range of wavelengths, where the first and second ranges do not overlap. The LED filament may be assembled using a plurality of die bonding processes. The LED dies may be arranged in a linear arrangement, a staggered arrangement, or combinations thereof. Additionally, the LED filament may be used in a lamp that includes the LED filaments coupled to a support mount within an envelope defining a cavity.