Light Source Device Polarization Management Red Light Balance
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Solution Overview
Problem
Existing light source devices that combine blue laser beams and fluorescence to generate white light face challenges in optimizing the white balance due to inevitable light loss in either the red laser beam or the red fluorescence component, leading to insufficient red light intensity.
Innovation Solution
A light source device incorporating a blue laser emitting element, a red laser emitting element, a phosphor for generating fluorescence, a polarization splitting/combining element, and wave plates to manage polarization and combine light components effectively, ensuring efficient transmission and reflection of red and blue light components to enhance light intensity and balance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If the transmittance of the combining mirror for the red component is increased, then the light loss in the red laser beam increases, but the light intensity of red light becomes insufficient
Solution Approach 1:
The patent divides the red light path into two separate channels: one for the red laser beam and another for the red component of fluorescence. By using a polarization beam splitter and wave plates, the system segments the optical paths to independently control and combine these two light sources, avoiding the trade-off between transmittance and light loss in a single combined path.
Solution Approach 2:
The patent introduces a polarization beam splitter and wave plates as intermediary optical elements to manage the combination of red laser beam and red fluorescence. These intermediaries enable precise control of polarization states, allowing both light sources to be effectively combined without direct competition for the same optical path, thereby resolving the contradiction between minimizing loss and maximizing intensity.
2Loss of energy
If the reflectance of the combining mirror for the red laser beam is increased, then the light loss in the red fluorescence increases, but the red light intensity becomes insufficient
Solution Approach 1:
The patent segments the optical system into distinct pathways using polarization optics. The red laser beam and red fluorescence are separated by polarization state and recombined after independent processing, eliminating the need for a single combining mirror that would cause light loss in either channel.
Solution Approach 2:
The patent changes the polarization parameters of the light beams using wave plates (quarter-wave plates and half-wave plates) to control the transmission and reflection characteristics of the polarization beam splitter. By dynamically adjusting polarization states, the system optimizes the combination efficiency of red laser beam and red fluorescence, resolving the contradiction between minimizing loss and maximizing intensity.
3Device complexity
If a combining mirror is used to transmit fluorescence and reflect red laser beam, then the white balance optimization becomes difficult, but the device complexity is reduced
Solution Approach 1:
The patent introduces polarization beam splitters and wave plates as intermediary elements to replace the simple combining mirror approach. These intermediaries provide precise control over the combination of red laser beam and red fluorescence, enabling independent optimization of each channel while maintaining overall system manageability. The added optical elements are compensated by the significant improvement in white balance control and light efficiency.
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 the generation of illumination light with improved white balance and high light use efficiency by effectively combining and supplementing red and blue light components, ensuring sufficient red light intensity and optimal tint control.
Implementation Method 1
a phosphor excited by the blue laser beam to generate fluorescence including a green component and a red component
Implementation Method 2
a polarization splitting/combining element configured to transmit or reflect a first polarization component of the blue laser beam and the red laser beam
Implementation Method 3
a first wave plate disposed between the polarization splitting/combining element and the diffusely reflecting element, a second wave plate disposed between the polarization splitting/combining element and the light combining element
Implementation Method 4
to guide the first polarization component of the blue laser beam and the red laser beam to the diffusely reflecting element
Implementation Method 5
the light combining element combines a part of second composite light and the red second polarization component split by the polarization splitting/combining element with each other to generate illumination light
Data Source
AI summary
A light source device includes a blue laser emitting element, a red laser emitting element, a phosphor for emitting fluorescence, a diffusely reflecting element, a polarization splitting/combining element configured to guide a first polarization component of a blue laser beam and a red laser beam to the diffusely reflecting element, and guide a second polarization component of the blue laser beam to the phosphor, a first wave plate, a light combining element, and a second wave plate. The polarization splitting/combining element splits a red first polarization component, a green component and a red second polarization component, and guides first composite light to the second wave plate, the first composite light being formed by combining the green component, the red first polarization component. The light combining element combines a part of second composite light and the red second polarization component with each other to generate illumination light.