Cubic Multi-Prism Beam Splitter for Compact Multiple Image Projection
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Solution Overview
Problem
Current projection apparatus for displaying multiple images are bulky and require multiple light sources, lacking a compact solution for simultaneously or sequentially projecting different image information, which limits their application in wide-screen, three-dimensional, and interactive imaging.
Innovation Solution
A compact multiple image projection apparatus utilizing a cubic multi-prism cemented beam splitter with first and second spatial light modulators and a single light source, configured to produce orthogonal polarized beams for independent image modulation, optionally enhanced with additional light sources and sensors for 3D and interactive capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple light sources are used to project multiple images, then the projection capability is improved, but the device size and complexity increase
Solution Approach 1:
The patent combines multiple projection paths into a single integrated optical system. A single light source is used to illuminate multiple spatial light modulators through a shared optical path, reducing the number of light sources from multiple to one. The optical system integrates beam splitters, mirrors, and multiple LCoS modulators in a compact arrangement, merging what would traditionally require separate projection apparatus into one unified device.
Solution Approach 2:
The single light source serves multiple functions by illuminating different spatial light modulators that generate different images. The optical system is designed to route light to multiple modulators and projection paths simultaneously, making the light source universal for multiple projection tasks rather than dedicated to a single function.
2Adaptability or versatility
If complete duplicates of single-image projection apparatus are used, then multiple images can be projected, but the device becomes bulky
Solution Approach 1:
Instead of using separate projection apparatus, the patent merges multiple projection functions into one compact system. The optical components (beam splitters, mirrors, modulators) are integrated in a shared optical path, dramatically reducing the volume compared to duplicate systems while maintaining multiple image projection capability.
Solution Approach 2:
The optical system employs a nested arrangement where multiple spatial light modulators and optical components are positioned in a compact, space-efficient configuration. The beam splitter cube and mirror arrangements create nested optical paths that fit within a reduced volume while maintaining full functionality for multiple image 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
Enables the creation of compact, efficient projection systems capable of displaying multiple images, including 3D images, with improved brightness and interactive features, surpassing existing technologies in terms of efficiency and versatility.
Implementation Method 1
a cubic multi-prism cemented beam splitter... having four sides and two diagonal interfaces including a beam splitter element positioned on at least one diagonal interface
Implementation Method 2
First and second spatial light modulators, such as LCoS spatial light modulators... the first LCoS spatial light modulator and the first light source are positioned adjacent one side of the cubic multi-prism beam splitter
Data Source
AI summary
Multiple image projection apparatus are described. A cubic multi-prism beam splitter is provided having diagonal interfaces with one or more PBS elements and/or reflective elements positioned thereon. At least first and second spatial light modulators, such as LCoS SLMs, are positioned adjacent the beam splitter cube. The first and second LCoS spatial light modulators and first and second projection optics systems are configured to output a first modulated image from the first LCoS SLM to the first projection optics system and a second modulated image from the second LCoS spatial light modulator to the second projection optics system. In other embodiments, additional LCoS spatial light modulators and light sources produce 3-D images. Addition of sensors permits user interaction with a projected image which is fed back to a controller to optionally change current or future images displayed by the system.