LED Package Wall Structure for RGB Color Mixing
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Solution Overview
Problem
Conventional light emitting diode (LED) units struggle to effectively mix light emitted from blue, red, and green LEDs into a desired color, due to difficulties in manufacturing red LEDs and inefficient light emission patterns.
Innovation Solution
A light emitting diode unit is designed with blue, red, and green LED packages on a substrate, each package including a wall to prevent side emission, allowing for easy adjustment of color balance by mixing emitted light.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If red light emitting diodes are used to display red light, then the color accuracy is improved, but the manufacturing cost increases and yield decreases
Solution Approach 1:
The patent uses blue LED chips as templates to create red light emission through wavelength conversion. Instead of manufacturing separate red LED chips, the invention copies the blue LED structure and modifies it with phosphor materials that convert blue light to red light, thereby avoiding the manufacturing difficulties of direct red LED production while maintaining color accuracy
Solution Approach 2:
The patent changes the optical parameters of blue LED light by introducing wavelength conversion materials (phosphors). By adjusting the phosphor composition and particle size, the blue light wavelength is transformed into red light wavelength, achieving the desired color output without requiring direct red LED fabrication
2Device complexity
If conventional LED packages without walls are used, then the device complexity is reduced, but light loss increases due to side emission
Solution Approach 1:
The patent converts the harmful side emission of light into a beneficial feature by using the side-emitted light to excite phosphor materials on the side walls. The previously wasted lateral light is now utilized for wavelength conversion, transforming energy that would have been lost into useful red or green light components
Solution Approach 2:
The patent transitions from conventional top-emission LED design to a multi-directional emission structure. By placing phosphor-coated walls on the sides and using blue LEDs positioned laterally, the system utilizes horizontal light propagation and conversion, adding a lateral dimension to the optical path and improving overall light extraction efficiency
3Ease of manufacture
If blue LEDs with wavelength conversion are used to display red light, then the manufacturing ease is improved, but the light emission efficiency decreases
Solution Approach 1:
The patent applies wavelength conversion selectively in different spatial locations. Blue LEDs are positioned at specific locations (corners or edges) where their emitted light can efficiently illuminate phosphor-coated side walls. This localized arrangement optimizes the blue-to-red conversion efficiency by ensuring proper geometric relationships between the blue light source and phosphor materials
Solution Approach 2:
The patent introduces phosphor materials as intermediary substances that mediate the energy transfer from blue LEDs to red light output. The phosphors act as intermediate energy carriers, absorbing blue photons and emitting red photons, thereby enabling the wavelength conversion process while managing energy loss through optimized phosphor selection and placement
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 efficient mixing of light from each LED package into a desired color, improving color balance and reducing light loss through side emission.
Implementation Method 1
A light emitting diode is an inorganic semiconductor device which emits light generated by recombination of electrons and holes
Implementation Method 2
a red wavelength converter 50 is disposed to cover the blue light emitting diode 22a... to convert a wavelength of blue light emitted from the blue light emitting diode 22a so as to emit red light to the outside
Implementation Method 3
a green wavelength converter 52 is disposed to cover the blue light emitting diode 22a to emit green light... to convert a wavelength of blue light emitted from the blue light emitting diode 22a so as to emit green light to the outside
Data Source
AI summary
A light emitting diode device including a substrate, a plurality of terminals disposed on the substrate, and a plurality of light sources disposed on the substrate, electrically connected to the plurality of terminals, and configured to emit light, in which each of the light sources includes a light emitting diode chip, and a wall surrounding side surfaces of the light emitting diode chip, at least one of the light sources includes a wavelength converter disposed on the light emitting diode chip, and at least two light sources share the wall.