Curved Windshield Parallax Optical Element for 3D Display Crosstalk
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Solution Overview
Problem
Display devices for vehicles face issues with crosstalk in naked eye stereoscopic vision due to the curvature of windshields, where projected 3D images may fail to reach the user's eyes, leading to incomplete image perception and crosstalk incidents.
Innovation Solution
A display device with a parallax optical element featuring a nonuniform array pattern of slits or lenses that conforms to the curved windshield surface, separating left-eye and right-eye images to prevent optical path deflection and reduce crosstalk, using a combination of a video element and a parallax barrier system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a uniform array pattern of separation parts is used in the parallax optical element, then the device structure is simple and easy to manufacture, but the projected stereoscopic images cannot conform to the curved windshield surface, causing optical path deflection and crosstalk
Solution Approach 1:
The patent applies local quality by transitioning from a uniform array pattern to a nonuniform array pattern where the spacing and positioning of separation parts are locally adjusted to match the curved windshield surface. This allows different regions of the parallax optical element to have different optical characteristics, ensuring that left-eye and right-eye images are accurately directed to their respective eyes despite the curved projection surface, thereby eliminating crosstalk while maintaining manufacturing feasibility.
2Area of stationary object
If the stereoscopic vision image is projected onto a curved windshield surface, then the display covers the actual windshield area, but the optical paths of left-eye and right-eye images are deflected, leading to incomplete image perception and crosstalk
Solution Approach 1:
The patent applies spheroidality by designing the array pattern of separation parts to conform to the curved surface of the windshield. The nonuniform distribution of separation parts follows the curvature, ensuring that optical paths are correctly directed across the entire curved projection area. This maintains complete image perception and eliminates crosstalk while utilizing the full windshield surface for display.
3Reliability
If the separation parts are densely arrayed to improve image separation, then crosstalk is reduced, but the manufacturing precision requirements increase and production becomes more difficult
Solution Approach 1:
The patent applies parameter changes by optimizing the spacing and distribution parameters of the separation parts in the nonuniform array pattern. Rather than simply increasing density uniformly, the invention adjusts local spacing parameters to achieve effective image separation while maintaining manufacturable precision levels. This allows crosstalk suppression through optimized parameter distribution rather than excessive density, balancing performance with manufacturing capability.
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
Effectively suppresses crosstalk in naked eye stereoscopic vision by ensuring that left-eye and right-eye images are accurately directed to their respective eyes, maintaining clear 3D image perception even with curved windshields.
Implementation Method 1
a parallax optical element which includes a plurality of separation parts arrayed in a lattice-like fashion and in a second array pattern, the separation parts separating the stereoscopic vision image into the left-eye images and the right-eye images
Data Source
AI summary
A display device includes a video element and a parallax optical element. The video element projects, onto a windshield, a stereoscopic vision image in which a plurality of rectangular left-eye images and a plurality of rectangular right-eye images are alternately arrayed in a first array pattern. The parallax optical element is provided between the video element and the windshield and includes a plurality of separation parts arrayed in a lattice-like fashion and in a second array pattern; the separation parts separating the stereoscopic vision image into the left-eye images and the right-eye images. At least one of the first array pattern and the second array pattern is a nonuniform array pattern that conforms to a curved surface of the windshield.