Projection Device Polarization Beam Splitting Brightness
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Solution Overview
Problem
Current projection devices using two light valves are limited in brightness due to the upper tolerance brightness of each valve, and the color distribution ratio required for mixing white light restricts the overall image beam brightness.
Innovation Solution
A projection device employing a polarization beam splitting component to split each color beam into two beams with perpendicular polarization states, allowing both light valves to process the same color beams simultaneously, thereby overcoming the brightness limitations of individual valves.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If two light valves are used to process different color beams, then the device can generate full-color image beams, but the brightness is confined by the upper limit of tolerance brightness of each light valve
Solution Approach 1:
The patent segments the color beams by polarization state rather than by color. Each light valve processes only one polarization state (first or second polarization beam), allowing both valves to work simultaneously on the same color beam with different polarization states. This segmentation by polarization enables the combined brightness to exceed the tolerance limit of a single valve.
Solution Approach 2:
The patent introduces polarization state as an additional dimension for processing light beams. Instead of processing different colors through different valves (2D color space), the system processes different polarization states of the same color beam through different valves (adding polarization dimension). This allows both valves to contribute to the same color channel, doubling the effective brightness.
2Illumination intensity
If the brightness of image beams is increased to exceed tolerance limits, then better image quality is achieved, but the light valves cannot withstand the excessive brightness
Solution Approach 1:
The patent divides the high-brightness requirement into two separate streams based on polarization state. Each light valve handles only one polarization stream at its safe tolerance level, avoiding overload. The combined output from both valves achieves the desired high brightness without exceeding individual valve limits, thus maintaining reliability.
3Illumination intensity
If three color beams are mixed to create white light, then full-color display is achieved, but the color distribution ratio requirements restrict overall brightness
Solution Approach 1:
The patent segments the color mixing process by polarization state. Instead of mixing three color beams to achieve white light (which requires strict color distribution ratios), the system processes each color beam separately through two polarization channels. This allows independent optimization of brightness for each color channel without being constrained by overall color distribution ratios.
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 approach enables the projection device to achieve ideal brightness by combining image beams from both light valves, unconfined by the tolerance brightness of a single valve, resulting in enhanced image output.
Implementation Method 1
The polarization beam splitting component splits each color beam among the beams of multiple colors into a first polarization beam and a second polarization beam, and the first polarization beam and the second polarization beam have polarization states perpendicular to each other
Data Source
AI summary
A projection device including an illumination system, a polarization beam splitting component, a first light valve, a second light valve, and a projection lens is provided. The polarization beam splitting component is disposed on a transmission path of the beams of multiple colors that are transmitted from the illumination system in time sequence. The polarization beam splitting component splits each color beam into a first polarization beam and a second polarization beam having polarization states perpendicular to each other. The first light valve is disposed on a transmission path of the first polarization beam and converts the first polarization beam into a first image beam. The second light valve is disposed on a transmission path of the second polarization beam and converts the second polarization beam into a second image beam. The projection lens is disposed on transmission paths of the first image beam and the second image beam.