Transflective Optical Plate Ghost Image Reduction
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Solution Overview
Problem
Ghost images occur in vehicle display systems due to improper overlap of image light reflected by the inner and outer surfaces of windshields, affecting driving safety and image quality.
Innovation Solution
A display system incorporating a transflective optical plate with a polarization conversion unit, optical film, and transparent protective layer, which changes the polarization state of polarized image light to enhance the light intensity difference between inner and outer reflections, reducing ghost images and improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the windshield thickness is increased to improve structural strength, then the ghost images become more prominent due to greater separation between inner and outer surface reflections
Solution Approach 1:
The patent changes the polarization state parameter of the light to differentiate between inner and outer surface reflections. By using a polarization conversion unit, the system transforms the polarization state of light reflected from the inner surface while maintaining the original polarization state of light reflected from the outer surface, creating a distinguishable difference that eliminates ghost images
Solution Approach 2:
The patent applies local quality by treating the light paths from inner and outer surfaces differently through polarization conversion. The polarization conversion unit selectively modifies only the light that has reflected from the inner surface, giving it a distinct polarization characteristic compared to light reflected from the outer surface, thereby enabling the display system to differentiate and prioritize one reflection over the other
2Object-affected harmful factors
If a polarization conversion unit is added to reduce ghost images, then image quality improves, but device complexity increases
Solution Approach 1:
The combiner in the polarization conversion unit serves multiple functions: it acts as a beam splitter to separate light paths, a polarization converter to change polarization state, and an optical element to direct light to the display device. By combining multiple functions into a single component, the patent reduces the need for additional separate optical elements, thereby limiting the increase in device complexity
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 ghost images by utilizing the difference in reflectivities of polarized lights to enhance the light intensity difference between inner and outer polarized image light, resulting in improved image quality and reduced power consumption.
Implementation Method 1
The polarization conversion unit is adapted to change a polarization state of the polarized image light
Implementation Method 2
the inner surface and outer surface of the windscreen both reflect the image light
Implementation Method 3
the optical film further enhances the light intensity difference between the inner polarized image light and the outer polarized image light or reduces interference of the ambient light
Data Source
AI summary
A transflective optical plate including a polarization conversion unit, an optical film, and a transparent protective layer is provided. The polarization conversion unit is adapted to change a polarization state of a polarized image light and includes a combiner. The optical film is disposed on the combiner. The transparent protective layer is disposed on the optical film, and the optical film is located between the combiner and the transparent protective layer. A display system is also provided.