Multi-Chip LED Array with Oriented Primary Emission Directions
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Solution Overview
Problem
Conventional multi-chip LED arrays require a large number of LEDs to achieve desired brightness, leading to high costs and reduced white light purity due to excessive color combination distance and potential malfunctions, which degrade the additive color effect.
Innovation Solution
The proposed illumination assembly features a multi-chip LED array with strategically oriented red, green, and blue LEDs and corresponding transparent lenses in alternating rows, ensuring that light is projected along specific directions to minimize color combination distance and enhance light emission efficiency, using a base plate and housing with a diffusion sheet to scatter and diffuse light uniformly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a large number of LEDs are used in a matrix cluster arrangement to achieve desired brightness, then the brightness level comparable to cold cathode fluorescent lamps is obtained, but the cost increases and the color combination distance becomes excessively large (approximately 30 mm)
Solution Approach 1:
The patent combines multiple LEDs (red, green, and blue) into a single integrated LED unit with a common lens, merging their light emission functions. This allows the additive color effect to occur within a compact structure, achieving desired brightness and color purity without requiring a large number of separate LEDs arranged in extensive matrices, thereby reducing device complexity and cost while minimizing color combination distance.
2Illumination intensity
If a large number of LEDs are arranged in a matrix cluster to achieve desired brightness, then the illumination level is sufficient, but the purity of white light is reduced due to excessive color combination distance and potential LED malfunctions
Solution Approach 1:
By integrating multiple LEDs of different colors into a single unit with a common lens, the patent ensures that all LEDs are positioned at optimal distances from the lens, enabling consistent additive color mixing. This merged structure maintains white light purity even if one LED malfunctions, as the compact integration ensures reliable color combination without the excessive distance issues of matrix arrangements.
3Volume of moving object
If three discrete red, green, and blue LEDs are integrated in a single package with a cylindrical transparent lens, then the structure is compact, but the light emitted from each LED is skewed in three different directions and is not projected vertically, increasing the color combination distance and degrading the additive color effect
Solution Approach 1:
The patent positions each LED at a specific location within the unit and uses a lens with a carefully designed shape and refractive index distribution to ensure that light from each LED is redirected along the desired vertical direction. This local optimization of light path control for each LED ensures that all colors are projected vertically without skew, maintaining compact packaging while achieving proper light direction for effective additive color mixing.
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 configuration achieves high purity white light with a reduced color combination distance, optimizing the additive color effect and reducing the risk of LED malfunctions, while maintaining brightness comparable to traditional lighting sources at lower costs.
Implementation Method 1
a first transparent lens. The second multi-chip LED unit includes a red LED, a green LED, and a blue LED, and further includes a second transparent lens. Emitted light of each of the red, green, and blue LEDs of the first and second multi-chip LED units has a respective primary emission direction along which a majority of the emitted light is projected through a corresponding one of the first and second transparent lenses
Implementation Method 2
using a base plate and housing with a diffusion sheet to scatter and diffuse light uniformly
Data Source
AI summary
An illumination assembly includes a first diode row having first and second multi-chip LED units, and a second diode row having third and fourth multi-chip LED units. The first through fourth multi-chip LED units each includes red, green, and blue LEDs. Light of the red, green, and blue LEDs of the first through fourth multi-chip LED units has a respective primary emission direction (PED). The PEDs of same colored ones of the LEDs of the first and second multi-chip LED units are oriented along one direction. The PEDs of the remaining two LEDs of the first and second multi-chip LED units are oriented in opposite directions from each other. The PEDs of the LEDs of the third and fourth multi-chip LED units are oriented in opposite directions as compared to those of the LEDs of the first and second multi-chip LED units, respectively.