Rotatable Light Splitting Module Illumination System
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Solution Overview
Problem
Current projection apparatuses using solid-state light sources face challenges with heat dissipation and efficiency due to the sensitivity of red light sources to temperature changes, leading to increased system volume and waste in using blue light sources for achieving RGB colors.
Innovation Solution
An illumination system with a rotatable light splitting module and separate laser light sources for blue and red light, allowing dynamic adjustment of color output by controlling the on/off periods and eliminating the need for a color filter wheel, thus simplifying heat dissipation and improving reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If additional red and blue light sources are provided to improve color performance, then color performance is improved, but heat dissipation difficulty increases and system volume increases
Solution Approach 1:
The patent merges the function of obtaining pure blue light with the excitation light source function by using a single blue laser diode. The blue laser beam serves dual purposes: as excitation light for the wavelength conversion module and as the pure blue light component for RGB projection, eliminating the need for a separate blue light source and reducing system volume.
Solution Approach 2:
The blue laser diode is designed to perform multiple functions simultaneously: it acts as the excitation light source for generating green and yellow lights through the wavelength conversion module, and also provides the pure blue light component directly for the RGB color projection, making the system more compact and efficient.
2Reliability
If additional red and blue light sources are provided to improve color performance, then color performance is improved, but heat dissipation conditions become more restrictive
Solution Approach 1:
The patent combines the excitation light source and pure blue light source into a single blue laser diode, reducing the total number of light sources that require heat dissipation management. This merger simplifies the thermal management system while maintaining color performance.
Solution Approach 2:
The patent extracts the pure blue light function from a separate light source and integrates it into the excitation light source system, removing the need for additional heat dissipation infrastructure for a separate blue light source while maintaining the required color output.
3Productivity
If blue light sources are turned on at different time periods to achieve RGB colors, then color sequence is achieved, but light source usage efficiency decreases and cost increases
Solution Approach 1:
The patent enables continuous operation of the blue laser diode as the excitation light source, which continuously generates green and yellow lights through the wavelength conversion module. Simultaneously, the pure blue light is continuously available, allowing the DMD to modulate all three RGB colors without time-sequencing interruptions, improving efficiency and maintaining color accuracy.
Solution Approach 2:
The patent eliminates the need for periodic switching of blue light sources by maintaining continuous blue light emission from the excitation source, allowing the DMD to continuously project all three primary colors without periodic interruptions, thereby improving light source usage efficiency and reducing system 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
This configuration achieves 100% RGB color light output ratio, reduces brightness loss, and allows dynamic adjustment of color points and temperature without altering optical elements, enhancing viewing quality and reliability.
Implementation Method 1
a wavelength conversion module, configured to convert the first laser beam to a converted beam having a wavelength different from that of the first laser beam
Implementation Method 2
the light splitting element has at least one transmitting region and at least one reflecting region. When the light splitting element rotates around the first rotation axis, the first laser beam is guided by the reflecting region of the light splitting element
Data Source
AI summary
An illumination system and a projection apparatus including the illumination system are provided with a rotatable light splitting module, wherein when a light splitting element rotates, a first laser beam forms a first color light through a reflecting region of the light splitting element and a light combining element during a first time period, a second laser beam passes through the light combining element to form a second color light during the second time period and the fourth time period, the first laser beam forms a third color light by the wavelength conversion module and the light combining element after passing through the transmitting region of the light splitting element during the third time period, and the first color light, the second color light and the third color light from the light combining element form an illumination beam.