Laser Package Beam Combining for Uniform Near-Eye Projection
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Solution Overview
Problem
Existing laser packages for projectors, particularly in near-eye display systems, face challenges in efficiently combining and driving multiple laser diodes due to lengthy driver development times and issues with speckle and image non-uniformity, necessitating a more efficient method for beam combination and control.
Innovation Solution
A laser package design incorporating a beam combiner, such as a polarization beam displacer, to combine light beams from multiple laser diodes with orthogonal polarizations, allowing simultaneous operation of multiple color channels using fewer drivers, and a method for intensity control of individual diodes to optimize illumination based on image regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple laser diodes are used to improve image quality and reduce speckle, then imaging quality is improved, but driver complexity and development time increase
Solution Approach 1:
The patent combines multiple laser diode beams using a beam combiner to create a unified output that maintains the benefits of multiple diodes (reduced speckle, improved quality) while simplifying the driver architecture. Multiple laser diodes are optically merged into a single beam path, reducing the need for separate complex driver circuits for each diode.
Solution Approach 2:
The beam combiner serves multiple functions simultaneously: it combines beams from multiple laser diodes, manages polarization states, and enables unified control of multiple diodes through a single driver interface. This multi-functionality reduces overall system complexity while maintaining the capabilities of multiple laser sources.
2Reliability
If multiple laser diodes are operated simultaneously to improve illumination uniformity, then image uniformity is improved, but control complexity increases
Solution Approach 1:
The beam combiner merges the optical paths of multiple laser diodes into a single unified beam, allowing simultaneous operation of multiple diodes to be controlled through a single interface. This combining action simplifies the control architecture while maintaining the illumination uniformity benefits of multiple active diodes.
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 design enables improved imaging quality and reduced driver complexity by combining light beams into unpolarized outputs, enhancing resolution and uniformity without relying on lengthy driver development, suitable for near-eye display systems like AR and VR glasses.
Implementation Method 1
A laser package design incorporating a beam combiner, such as a polarization beam displacer, to combine light beams from multiple laser diodes with orthogonal polarizations
Data Source
AI summary
A laser package including at least a first laser diode set having at least two laser diodes emitting light beams of a first color, at least a second laser diode set having at least two laser diodes emitting light beams of a second color, and a beam combiner.