Light Source Module Symmetrical Polarization Control

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Solution Overview

Problem

The challenge is to enhance the uniformity of emitted light color in projector systems using single-package three-color laser diodes, as improper arrangement can lead to non-uniform color emission.

Innovation Solution

A light source module is designed with a symmetry axis, featuring a phase retardation layer, two light sources, and two sets of Polarization Beam Splitter (PBS) and light redirector layers, which convert and redirect polarized light to achieve symmetrical light distribution, ensuring uniform color emission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a single package including pure three-color laser diode is applied, then high color restoration and vividness are achieved, but non-uniform color of the emitted light occurs

Engineering Contradiction:

Improvecolor restorationVSAvoidcolor uniformity

Core Design Contradiction:

Illumination intensityVSManufacturing precision

Solution Approach 1:

The patent divides the single light source into multiple laser diodes emitting different colors (red, green, blue) and arranges them in a specific symmetrical pattern. This segmentation allows each laser diode to contribute to the overall color output while maintaining uniformity through their structured arrangement.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The patent employs a symmetrical arrangement (which is a form of controlled asymmetry relative to conventional approaches) where laser diodes are positioned symmetrically around a central axis. This symmetrical configuration ensures that light from different colors is distributed uniformly across the emission area, resolving the color uniformity issue.

Inventive Principle:

Principle #4Asymmetry

2Volume of moving object

If laser diodes are arranged in a single package, then compact size is achieved, but color uniformity deteriorates

Engineering Contradiction:

Improvemodule sizeVSAvoidcolor uniformity

Core Design Contradiction:

Volume of moving objectVSManufacturing precision

Solution Approach 1:

The patent combines multiple laser diodes of different colors into a single integrated package or module. By merging these light sources while implementing a symmetrical arrangement, the design achieves compact size comparable to conventional single-package solutions while improving color uniformity through the structured configuration.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent transitions from a conventional linear or simple planar arrangement to a symmetrical two-dimensional configuration where laser diodes are positioned around a central axis. This dimensional change enables better spatial distribution of different colors, achieving uniform color emission within a compact volume.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

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 symmetrical arrangement improves the color uniformity of the mixed light, providing better color restoration and vividness in projector systems.

Implementation Method 1

the first phase retardation layer is configured to convert the first linear polarization direction of the first polarized light into the second linear polarization direction

Methodology Applied

Scientific EffectPhase retardation: Birefringence

Implementation Method 2

the first PBS layer and the second PBS layer allow polarized light having the first linear polarization direction to travel through but reflect polarized light having the second linear polarization direction

Methodology Applied

Scientific EffectPolarization beam splitting: Polarisation

Implementation Method 3

the first light redirector layer and the second light redirector layer are configured to reflect polarized light having the second linear polarization direction light

Methodology Applied

Scientific EffectLight refraction and reflection: Refraction

Data Source

PatentUS11774840B2Light source module

Publication Date: 2023.10.03 QISDA CORP

AI summary

A light source module includes phase retardation layer, first light source, second light source, first Polarization Beam Splitter (PBS) layer, second PBS layer, first redirector and second redirector. The phase retardation layer, the first light source, the second light source, the first PBS layer, the second PBS layer, the first redirector and the second redirector are symmetrically disposed relative to symmetry axis. The first light source and the second light source each emit polarized light having first linear polarization direction and polarized light having second linear polarization direction. The phase retardation layer converts the first linear polarization direction of polarized light into the second linear polarization direction. The PBS layers allow polarized light having the first linear polarization direction to travel through but reflect polarized light having the second linear polarization direction. The redirector reflects polarized light having the second linear polarization direction.