Vehicle Windshield Display Filter for Ghosting Suppression
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Solution Overview
Problem
Conventional display devices for vehicles suffer from deteriorated visibility of display images due to ghosting effects caused by light diffracted in holograms, which affects the clarity and effectiveness of the displayed information.
Innovation Solution
A display device for vehicles is designed with a reflection type hologram on the windshield, where a first display device projects light as diffraction light and a second display device projects light as reflection light, with a filter part in the second projection part cutting light in specific wavelength regions to prevent ghosting and enhance visibility, by overlapping the light incidence regions on the windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a hologram is used to display a first display image by diffraction light, then the display functionality is enhanced, but ghosting occurs due to light diffracted in the hologram which deteriorates visibility
Solution Approach 1:
The patent extracts and removes the harmful wavelength components from the second display light that would cause ghosting when diffracted by the hologram. The filter part selectively transmits only the wavelength regions that do not interfere with the holographic diffraction, thereby eliminating the ghosting effect while preserving the display functionality.
Solution Approach 2:
The filter part acts as an intermediary between the second display light source and the hologram. It mediates the interaction by selectively blocking certain wavelengths before they reach the hologram, preventing the harmful diffraction that causes ghosting while allowing beneficial wavelengths to pass through.
2Adaptability or versatility
If multiple display devices are used to display multiple display images, then the information display capability is improved, but the visibility of display images deteriorates due to ghosting
Solution Approach 1:
The filter part extracts and removes the specific wavelength components from the second display light that would create ghosting images. By eliminating these harmful wavelengths before they reach the hologram, the patent ensures that multiple display images can be shown simultaneously without visibility deterioration.
3Area of stationary object
If the light incidence regions of first and second display light overlap on the windshield, then the display space is efficiently utilized, but ghosting occurs due to interaction between the lights in the hologram
Solution Approach 1:
The filter part removes the wavelength components from the second display light that would cause ghosting when overlapping with the first display light in the hologram. This allows efficient use of the overlapping display space on the windshield while eliminating the harmful interaction effects.
Solution Approach 2:
The filter part applies selective wavelength filtering specifically to the second display light in the overlapping region. By modifying the spectral composition locally in the area where light paths overlap, the patent enables efficient space utilization without ghosting in the critical overlapping zone.
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 suppresses ghosting and improves the visibility of both display images by selectively filtering out diffracted wavelengths, ensuring clearer and more effective information display for the driver.
Implementation Method 1
a first display device including a reflection type hologram that is disposed on a windshield of the vehicle, and a first projection part that projects first display light toward the hologram, and displaying a first display image by diffraction light diffracted by the hologram
Implementation Method 2
a second display device including a second projection part that projects second display light toward the windshield, and displaying a second display image by reflection light reflected by the windshield
Implementation Method 3
the second projection part includes a filter part that cuts light in a predetermined wavelength region from the second display light, and the predetermined wavelength region is a wavelength region of the light diffracted by the hologram
Data Source
AI summary
A display device for a vehicle includes: a first display device including a reflection type hologram that is disposed on a windshield of a vehicle, and a first projection part that projects first display light toward the hologram, and displaying a first display image by diffraction light diffracted by the hologram; and a second display device including a second projection part that projects second display light toward the windshield, and displaying a second display image by reflection light reflected by the windshield. In the windshield, a first region where the first display light is incident and a second region where the second display light is incident overlap with each other, the second projection part includes a filter part that cuts light in a predetermined wavelength region from the second display light, and the predetermined wavelength region is a wavelength region of the light diffracted by the hologram.