Light Emitting Apparatus with Reflective Part and Wavelength Converter
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Solution Overview
Problem
Light emitting diodes (LEDs) suffer from significant light loss when mounted on substrates or packages, limiting their illumination efficiency due to light being blocked by the substrate or package, especially when using light-transmissive substrates like sapphire.
Innovation Solution
A light emitting apparatus featuring a light-transmissive substrate with semiconductor LEDs, a reflective part to redirect light, and wavelength converters to concentrate and convert light, enhancing light emission efficiency and color range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a light-transmissive substrate (e.g., sapphire) is used for the semiconductor light emitting device, then light can be effectively utilized through the substrate, but the light is blocked by the printed circuit board or package, reducing light intensity
Solution Approach 1:
The patent inverts the conventional mounting approach by placing the light-transmissive substrate with the LED on the front surface rather than mounting the LED directly on the PCB. This inversion allows light to exit through the transparent substrate without being blocked by the PCB, resolving the contradiction between light utilization and light intensity.
Solution Approach 2:
The light-transmissive substrate acts as an intermediary element between the LED and the external environment. It allows light to pass through effectively while the reflective part serves as another intermediary to redirect light that would otherwise be lost, thereby maintaining both high light utilization and high light intensity.
2Area of stationary object
If light is emitted within a wide range from the chip mounting surface, then the range of light emitted is widened, but light loss on the surface attached to the substrate increases
Solution Approach 1:
The patent converts the harmful light loss into a beneficial effect by introducing a reflective part. Light that would be lost at the chip mounting surface is instead reflected back toward the light-transmissive substrate, transforming energy loss into useful light output and thereby widening the effective light emission range without increasing light loss.
Solution Approach 2:
The reflective part redirects light in a different spatial dimension, bouncing light that would travel downward into the substrate back upward through the light-transmissive substrate. This dimensional redirection expands the effective light emission area while minimizing energy loss.
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 significantly reduces light loss and improves light emission efficiency by redirecting and converting light emitted from LEDs, allowing for wider light distribution and desired color output, such as white light, thereby enhancing illumination performance.
Implementation Method 1
a reflective part disposed over the semiconductor light emitting device to reflect light from the semiconductor light emitting device toward the light-transmissive substrate
Implementation Method 2
a first wavelength converter disposed between the light-transmissive substrate and the reflective part
Data Source
AI summary
A light emitting apparatus is disclosed. The light emitting apparatus includes a light-transmissive substrate having a top surface and a bottom surface, at least one semiconductor light emitting device disposed on the top surface of the light-transmissive substrate, a reflective part disposed over the semiconductor light emitting device to reflect light from the semiconductor light emitting device toward the light-transmissive substrate, and a first wavelength converter disposed between the light-transmissive substrate and the reflective part.