3D Display Polarization Layout for Low-Crosstalk Viewing
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Solution Overview
Problem
Existing three-dimensional display devices suffer from crosstalk issues due to polarization state collapse, causing images intended for one eye to be seen by the other eye, leading to a diminished three-dimensional viewing experience.
Innovation Solution
A three-dimensional display device comprising two image displays, retardation plates, and a half mirror, along with circularly polarized glasses, where the retardation plates and half mirror are optimized to generate and separate right- and left-rotation circularly polarized light for each eye, ensuring minimal crosstalk.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If circular polarizing filters and half mirrors are used to generate three-dimensional images, then the three-dimensional display function is achieved, but polarization state collapse occurs causing crosstalk between left and right eyes
Solution Approach 1:
The patent divides the circular polarizing filter into multiple separate linear polarizing filters arranged in specific orientations. Instead of using a single circular polarizing filter that causes polarization collapse, the invention uses multiple linear polarizing filters (at least two) with different transmission axes, each combined with quarter-wave plates to generate circularly polarized light for different eyes separately, thereby preventing crosstalk while maintaining the three-dimensional display function
Solution Approach 2:
The patent applies different optical properties to different regions of the display system. Each eye's viewing path is equipped with specifically oriented linear polarizing filters and quarter-wave plates tailored to generate the appropriate circular polarization state (right-handed for one eye, left-handed for the other), ensuring that each region of the display optimizes polarization maintenance for its specific function
2Adaptability or versatility
If circular polarizing filters are used to convert image light to circularly polarized light, then three-dimensional image display is enabled, but crosstalk occurs when observers wear circularly polarized glasses
Solution Approach 1:
The patent extracts and eliminates the problematic circular polarizing filter component that causes polarization collapse and crosstalk. Instead of using circular polarizing filters directly, the invention separates the functions into linear polarizing filters and quarter-wave plates, allowing precise control over the polarization state for each eye and eliminating the source of crosstalk
Solution Approach 2:
The patent employs asymmetric arrangements of linear polarizing filters with different transmission axis orientations for different eyes. The first and second linear polarizing filters are oriented at different angles (e.g., 45 degrees apart), creating asymmetric polarization paths that prevent the polarization states from collapsing into each other, thereby eliminating crosstalk while maintaining circular polarization for each eye
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 effectively reduces crosstalk to 2.0% or lower, providing a clear and distinct three-dimensional image to each eye, enhancing the viewing experience.
Implementation Method 1
a first retardation plate 112 and a second retardation plate 122, the retardation value of the first retardation plate 112 being in a range of 136 nm to 165 nm and the retardation value of the second retardation plate 122 being in a range of 72 nm to 114 nm
Implementation Method 2
a half mirror 130 arranged between the first image display 110 and the second image display 120
Data Source
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AI summary
A three-dimensional display device (100) includes: a first image display (110) that outputs linearly polarized first image light (151); a second image display (120) that outputs linearly polarized second image light (152); a first retardation plate (112) that modulates and converts the first image light (151) output from the first image display (110) to first elliptically polarized light; a second retardation plate (122) that modulates and converts the second image light (152) output from the second image display (120) to second elliptically polarized light that rotates in a direction identical to a rotation direction of the first elliptically polarized light; and a half mirror (130) that transmits the first elliptically polarized light, converts the first elliptically polarized light to first circularly polarized light that rotates in a direction identical to the rotation direction of the first elliptically polarized light, reflects the second elliptically polarized light, and coverts the second elliptically polarized light to second circularly polarized light that rotates in a direction opposite the rotation direction of the second elliptically polarized light.