HUD Light Shielding Part Protrusions Prevent Virtual Image Washout
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Solution Overview
Problem
The bottom surface of conventional light shielding parts in head-up display devices is illuminated by scattered display light, causing the light shielding part to be visible as a virtual image, which impairs the marketability of the device.
Innovation Solution
A head-up display device with a light shielding part featuring strip-shaped protrusion parts on its bottom surface, which are formed to increase in size as they move away from the display unit, preventing scattered light from reaching the concave mirror and reducing the likelihood of the bottom surface being displayed as a virtual image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a light shielding part is added to prevent washout phenomenon, then the visibility of virtual image under sunlight is improved, but the bottom surface of the light shielding part becomes illuminated by scattered light and shines as a virtual image
Solution Approach 1:
The bottom surface of the light shielding part is segmented into multiple protrusion parts that extend toward the concave mirror. These protrusions divide the scattered light paths and create shadows that prevent illumination of the bottom surface, thereby eliminating the unwanted virtual image while maintaining the light shielding function.
Solution Approach 2:
The solution introduces a new spatial dimension by adding protrusion parts that extend in the depth direction (toward the concave mirror) from the bottom surface. This three-dimensional structure creates shadow regions that block scattered light from illuminating the bottom surface, solving the problem without compromising the original light shielding capability.
2Illumination intensity
If the light shielding part blocks opening part to prevent sunlight entry, then external light interference is reduced, but scattered display light illuminates the bottom surface and creates visible virtual image
Solution Approach 1:
The protrusion parts are strategically positioned at specific locations on the bottom surface where scattered light would cause illumination. By localizing the light-blocking function to these specific protrusion regions, the solution prevents scattered light reflection without affecting the overall light shielding performance of the opening part.
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 prevents the light shielding part from shining, enhancing the marketability of the head-up display device by minimizing the visibility of the light shielding part as a virtual image.
Implementation Method 1
a light shielding part that blocks a part of an opening part from which the display light is emitted
Implementation Method 2
a bottom surface of the light shielding part is illuminated with scattered light of display light emitted from the display unit
Data Source
AI summary
The present invention provides a head-up display device wherein a light shielding part for preventing a washout phenomenon is prevented from shining. A head-up display according to the present invention, in which a display unit for emitting display light (L) is housed in a case and the upper portion of the display unit is covered by the light shielding part, has strip-shaped protrusion parts formed on the bottom surface of the light shielding part (42). With this constitution, the strip-shaped protrusion parts prevent the scattered light (SL) resulting from the light (L) output from the display unit from illuminating the bottom surface of the anti-washout light shielding part, thereby preventing the bottom surface from being displayed as a virtual image.