3D Display Polarization Layout for Crosstalk Reduction
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Solution Overview
Problem
Existing three-dimensional display devices suffer from crosstalk due to polarization state collapse, causing image light 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 a first and second image display with retardation plates and a half mirror, where the retardation plates convert linearly polarized light to elliptically polarized light, and the half mirror converts this to circularly polarized light with opposite rotation directions, combined with circularly polarized glasses that filter out unwanted light for each eye.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a circular polarizing filter is used to convert image light to circularly polarized light, then three-dimensional image display is achieved, but polarization state collapse occurs causing crosstalk
Solution Approach 1:
The patent changes the polarization state parameter from linear to elliptical polarization by introducing retardation plates with specific retardation values (first retardation plate: 136-165 nm, second retardation plate: 72-114 nm). This parameter change prevents polarization state collapse and reduces crosstalk while maintaining three-dimensional image display functionality.
Solution Approach 2:
The patent introduces retardation plates as intermediary components between the image displays and the half mirror. These retardation plates serve as mediators that convert linearly polarized light to elliptically polarized light, preventing direct polarization state collapse and reducing crosstalk before the light reaches the half mirror.
2Reliability
If image displays are arranged at a predetermined angle with equivalent angles to the half mirror, then crosstalk is reduced, but device complexity increases
Solution Approach 1:
The patent employs asymmetric arrangement of the first and second image displays at predetermined angles relative to the half mirror. The first image display is positioned at an angle α and the second image display at an angle β, where α ≠ β in terms of physical positioning, but the angles formed with the half mirror surface are equivalent. This asymmetric configuration reduces crosstalk while managing device complexity through geometric optimization.
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 significantly reduces crosstalk, allowing for a clearer and more effective three-dimensional image perception by ensuring each eye receives the intended parallax image.
Implementation Method 1
a first retardation plate that modulates and converts the first image light output from the first image display to first elliptically polarized light
Implementation Method 2
a second retardation plate that modulates and converts the second image light output from the second image display to second elliptically polarized light
Implementation Method 3
a half mirror that transmits the first elliptically polarized light, converts the first elliptically polarized light to first circularly polarized light
Implementation Method 4
reflects the second elliptically polarized light, and coverts the second elliptically polarized light to second circularly polarized light
Data Source
AI summary
A three-dimensional display device includes: a first image display that outputs linearly polarized first image light; a second image display that outputs linearly polarized second image light; a first retardation plate that modulates and converts the first image light output from the first image display to first elliptically polarized light; a second retardation plate that modulates and converts the second image light output from the second image display 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 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 converts 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.