Vehicle Display Device Using Polarization Element for Compact Optical Path
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Solution Overview
Problem
Conventional display devices for vehicles require a large size to maintain a sufficient visual distance for the driver to view the rear image, leading to increased distances between components and a larger device size.
Innovation Solution
Incorporating a display element with at least two mirrors and a polarization element that reflects and transmits light, increasing the optical path length while reducing the device size by allowing the light to be reflected off the polarization element twice and transmitted once, thereby providing a sufficient visual distance with a smaller form factor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the distance between components is increased to provide sufficient visual distance for the driver, then the visual distance is improved, but the device size increases
Solution Approach 1:
The patent uses a polarization element to create multiple optical paths (reflection paths) for light to travel. Instead of increasing the physical distance between components in a straight line, the light is reflected multiple times through the polarization element, effectively increasing the optical path length within a compact physical space. This allows sufficient visual distance to be achieved without increasing the overall device volume.
2Ease of operation
If the number of optical paths is increased to extend the optical path length, then the visual distance is improved, but the device complexity increases
Solution Approach 1:
The polarization element serves multiple functions simultaneously: it acts as a beam splitter to create multiple optical paths, a reflector to redirect light, and a polarizing filter to control light transmission. By making the polarization element multi-functional, the patent achieves complex optical path manipulation without adding proportionally more components, thus improving visual distance while 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 reduces the overall size of the display device while ensuring a sufficient visual distance for the driver, allowing for a more compact design without compromising the clarity of the rear image displayed.
Implementation Method 1
a polarization element, wherein the polarization element is configured to reflect and transmit the emission light
Implementation Method 2
the emission light is reflected off the polarization element twice and transmitted through the polarization element once
Data Source
AI summary
A display device includes: a display element including a display surface on which image is displayed; a first mirror and a second mirror that reflects emission light emitted from the display surface of the display element; and a polarization element. The polarization element is configured to reflect and transmit the emission light from display surface. The emission light from display surface is reflected off polarization element twice and transmitted through polarization element once by a time the emission light is reflected off first mirror and second mirror and exits from display device.