Oblique Wavelength Conversion for LED Brightness
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Solution Overview
Problem
The existing projection apparatus using LEDs as light sources has low light emitting efficiency, particularly for green LEDs, which limits the brightness of the projector and is not suitable for high brightness applications.
Innovation Solution
A light source module with a first light emitting device emitting an exciting beam, a reflection unit, a wavelength conversion unit, and a light combination unit, where the exciting beam is obliquely incident into the wavelength conversion unit to enhance light conversion efficiency, and a dichroic unit is disposed obliquely to improve beam convergence and light utilization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If green LED is used as the light source for main brightness contribution, then the projection apparatus can provide color images, but the light emitting efficiency is low and the whole brightness is limited
Solution Approach 1:
The patent changes the wavelength parameter of the light source from green LED to blue LED, and introduces a wavelength conversion unit with phosphor materials to convert the blue light to green light. This parameter change allows the system to achieve higher brightness by using blue LED (which has higher efficiency) instead of green LED, while still providing the necessary green light for brightness contribution through wavelength conversion.
Solution Approach 2:
The patent introduces a wavelength conversion unit as an intermediary component between the blue LED light source and the projection system. This unit contains phosphor materials that convert blue light to green light, serving as a mediator to bridge the gap between the high-efficiency blue LED and the required green light output, thereby solving the efficiency problem while maintaining color image capability.
2Use of energy by moving object
If the exciting beam is normally incident into the wavelength conversion unit, then the structure is simple, but the light conversion efficiency is low
Solution Approach 1:
The patent changes the incident angle from normal incidence (0 degrees) to oblique incidence (non-zero angle) by adjusting the spatial arrangement of the wavelength conversion unit relative to the LED. This dimensional change in the beam's entry angle increases the path length and interaction area between the exciting beam and phosphor materials, thereby improving light conversion efficiency without adding complex multi-component structures.
Solution Approach 2:
The patent optimizes the spatial position and orientation of the wavelength conversion unit dynamically during the beam path design, setting it at a specific oblique angle to maximize light conversion efficiency. This dynamic optimization of geometric parameters allows the system to achieve high efficiency with a relatively simple single-unit structure.
3Illumination intensity
If the wavelength conversion unit is positioned to maximize light conversion, then the first color beam intensity increases, but the device complexity increases
Solution Approach 1:
The patent merges the wavelength conversion function and the light guiding function into a single integrated unit. The wavelength conversion unit is positioned and oriented to simultaneously achieve maximum light conversion efficiency and proper beam direction control, combining multiple functions in one component rather than using separate components for each function, thereby reducing overall device complexity.
Solution Approach 2:
The wavelength conversion unit is designed to serve multiple purposes: it converts blue light to green light, guides the beam along the optical axis, and optimizes light extraction efficiency. This multi-functional design reduces the need for additional separate components, thereby increasing beam intensity while minimizing device complexity.
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 increases the intensity of the first color beam, enhancing the brightness and light conversion efficiency of the light source module, thereby overcoming the limitations of existing LED light sources.
Implementation Method 1
The wavelength conversion unit is disposed on the reflection unit, and is located on the transmission path of the exciting beam. The exciting beam is obliquely incident into the wavelength conversion unit along an optical axis of the first light emitting device, and the wavelength conversion unit converts the exciting beam into a first color beam.
Implementation Method 2
The reflection unit is disposed on a transmission path of the exciting beam.
Data Source
AI summary
A light source module and a wavelength conversion module are provided. The light source module includes a first light emitting device, a reflection unit, a wavelength conversion unit, a second light emitting device and a light combination unit. The first light emitting device emits an exciting beam. The reflection unit is disposed on a transmission path of the exciting beam. The wavelength conversion unit is disposed on the reflection unit and located on the transmission path of the exciting beam. The exciting beam is obliquely incident into the wavelength conversion unit along an optical axis of the first light emitting device, and the wavelength conversion unit converts the exciting beam into a first color beam. The second light emitting device emits a second color beam. The light combination unit is disposed on transmission paths of the first color beam and the second color beam.