LCOS Projection Splicing Layout With Polarization Beam Splitting
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Solution Overview
Problem
Existing projection systems using LCOS chips face challenges with multiple reflective surfaces, leading to planar surface errors and difficulties in pattern splicing adjustment, particularly in high-resolution applications like projectors and exposure machines.
Innovation Solution
A splicing projection device utilizing a reflective liquid crystal image modulator with a specific optical path design involving beam splitting prisms and LCOS chips, eliminating the need for additional reflectors and simplifying the optical path structure to achieve parallel image splicing without pixel overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple LCOS chips are used to achieve high resolution, then the resolution is improved, but the number of reflective surfaces increases causing planar surface errors and splicing adjustment difficulties
Solution Approach 1:
The projection system is segmented into multiple independent optical paths, each handling a portion of the total resolution requirement. Multiple LCOS chips work in parallel to display different regions or color components, with each chip's output being precisely controlled to minimize splicing errors at boundaries.
Solution Approach 2:
The patent introduces a new dimensional approach by using polarization states (P-polarized and S-polarized light) as an additional degree of freedom. By modulating different polarization components across multiple LCOS chips and using polarization beam splitting prisms, the system achieves high resolution without proportionally increasing the number of reflective surfaces in a single plane, thereby reducing planar surface errors and splicing adjustment difficulties.
2Area of stationary object
If multiple reflective surfaces are used for field-of-view splicing, then the field of view is expanded, but the optical path complexity increases making adjustment difficult
Solution Approach 1:
The patent merges the functions of multiple reflective surfaces into polarization beam splitting prisms that simultaneously perform beam splitting and polarization modulation. This consolidation reduces the total number of separate reflective components while maintaining the expanded field of view, thereby simplifying the optical path and reducing adjustment complexity.
Solution Approach 2:
By utilizing the polarization dimension (P and S polarized light paths), the system achieves field of view expansion without requiring proportional increases in the number of reflective surfaces. The polarization-based optical path manipulation allows for more efficient space utilization and reduced component count compared to traditional reflective splicing methods.
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 reduces planar surface errors and simplifies image splicing adjustments, enabling high-resolution, error-free splicing of multiple LCOS chip projections.
Implementation Method 1
the first beam of light forms transmission-propagated P-polarized light and reflection-propagated S-polarized light after passing through the first polarization beam splitting prism
Implementation Method 2
the first LCOS chip modulates a part of a light of the P-polarized light into S-polarized light and then reflects same back to the first polarization beam splitting prism
Data Source
AI summary
A splicing projection device and method based on a reflective liquid crystal image modulator. In the splicing projection device based on a reflective liquid crystal image modulator, four parallel image lights modulated by first to fourth LCOS chips are formed through optical path designs of one or two light sources, one or two common beam splitting prisms, first to second polarization beam splitting prisms, first to fourth LCOS chips and an imaging lens. A whole image is spliced on a projection plane. The optical path design of the splicing projection device avoids the problem of adding a reflector during the splicing process with respect to the prior art. It can not only realize the parallel image splicing of four chips, but also simplify the optical path structure, and avoid introducing many plane surface errors, and bring great convenience for image splicing adjustment.