Laser Projection Optics With Phase Retarder for Polarization Alignment
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Solution Overview
Problem
Current laser projection systems face challenges in achieving consistent polarization direction for red, green, and blue laser beams, leading to color block and color deviation issues, which increase system complexity and cost while hindering miniaturization.
Innovation Solution
A laser device design that includes a frame with a substrate and annular sidewall, a sealing light-transmitting layer, light emitting chips with different polarization directions, and a phase retarder to adjust the polarization of laser beams, ensuring all beams have the same polarization direction before exiting, using prisms and phase retarders to align the polarization of red, green, and blue laser beams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate optical paths with different polarization directions are used for red, green, and blue laser beams, then color display capability is achieved, but system complexity increases and color block issues occur
Solution Approach 1:
The patent merges multiple optical paths with different polarization directions into a unified optical path. By using a polarization beam combiner, red, green, and blue laser beams with different polarizations are combined and output through a single optical path, eliminating the need for separate optical paths while maintaining color display capability. This reduces system complexity and prevents color block issues caused by multiple separate paths.
Solution Approach 2:
The patent implements a universal optical path that can handle multiple polarization directions simultaneously. The polarization beam combiner serves multiple functions: it combines beams of different polarizations, maintains polarization information, and enables a single optical path to carry all color information. This multi-functional approach eliminates the need for separate specialized optical paths for each color.
2Reliability
If multiple optical components are used to adjust polarization directions, then consistent polarization output is achieved, but device size increases
Solution Approach 1:
The patent combines polarization adjustment functions into integrated components. Rather than using separate adjustment elements for each color path, the polarization beam combiner performs both beam combining and polarization management in a single component. This integration reduces the number of optical components and minimizes device size while ensuring consistent polarization output.
Solution Approach 2:
The polarization beam combiner acts as an intermediary component that mediates between multiple input beams with different polarizations and the single output path. It efficiently manages polarization states without requiring additional complex adjustment mechanisms, thereby reducing device size while maintaining polarization consistency.
3Manufacturing precision
If separate optical paths are used for different colors, then color purity is maintained, but cost increases
Solution Approach 1:
The patent merges multiple color paths into a single optical path using a polarization beam combiner, reducing the total number of optical components required. This consolidation lowers manufacturing costs while maintaining color purity because the combiner preserves the polarization and spectral characteristics of each color beam during the combining process.
Solution Approach 2:
The universal optical path with polarization beam combining capability serves all color channels simultaneously, eliminating the need for separate dedicated optical paths for each color. This multi-functional approach reduces component count and manufacturing complexity while maintaining the color purity required for high-quality laser projection.
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 solution effectively eliminates color block issues by ensuring all laser beams have consistent polarization, reducing system complexity and cost, and enabling miniaturization of the laser projection equipment.
Implementation Method 1
a phase retarder, disposed within the accommodating space and parallel to the substrate, wherein a laser beam from at least a part of the light emitting chips passes through the phase retarder to change a polarization direction
Implementation Method 2
at least one prism, each of the at least one prism corresponding to at least one of the light emitting chips, each of the at least one prism being configured to receive a laser beam from a corresponding light emitting chip and to reflect the laser beam toward a light emitting direction
Data Source
AI summary
A laser device and a laser projection equipment are provided. The laser device includes: at least one frame, each of the at least one frame including a substrate and an annular sidewall; a sealing light-transmitting layer, the substrate, the annular sidewall and the sealing light-transmitting layer forming a sealed accommodating space; a plurality of light emitting chips; at least one prism, configured to receive a laser beam exiting from a corresponding light emitting chip and to reflect the laser beam toward a light emitting direction of the laser device; and, a phase retarder, disposed within the accommodating space and parallel to the substrate, wherein a beam of at least a part of the light emitting chips passes through the phase retarder to change a polarization direction of a laser light before being transmit to the sealing light-transmitting layer