Vehicle Head-Up Display Switching Virtual Real Image Warnings
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Solution Overview
Problem
Existing vehicle head-up displays (HUDs) face challenges in ensuring that warning information is not missed by drivers when switching between virtual and real image displays, as focus positions differ for each, potentially leading to missed warnings due to incorrect focus adjustment.
Innovation Solution
A projection type display device with both virtual and real image display units, controlled by controllers that input guidance information, including arrows to direct the driver's line of sight to the appropriate image type (virtual or real) based on the content of the warning information, ensuring visibility of warnings regardless of the display switch.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If warning information is displayed using a virtual image, then the driver can recognize it at a distant position, but the driver may miss the information if the focus is adjusted for a real image
Solution Approach 1:
The patent introduces an arrow guidance element as an intermediary visual cue that mediates between the driver's current focus state and the location of warning information. The arrow acts as a mediator that guides the driver's line of sight to the correct image type (virtual or real) where the warning is displayed, resolving the contradiction by ensuring the driver notices the warning regardless of focus adjustment.
Solution Approach 2:
The system performs preliminary action by displaying an arrow guidance element before the driver may miss the warning information. The arrow is displayed in advance to guide the driver's attention to the correct image type, preventing the potential loss of warning information due to incorrect focus adjustment.
2Speed
If the display switches suddenly from virtual image to real image, then the driver can receive warning information, but the driver may miss the switch and not notice the warning
Solution Approach 1:
The arrow serves as an intermediary element that bridges the sudden transition between virtual and real image displays. Instead of directly switching image types which may be missed by the driver, the arrow provides a continuous visual guide that maintains driver attention and directs it to the new display location, preventing information loss during the transition.
Solution Approach 2:
The system implements feedback by displaying an arrow that provides continuous visual information about where the warning is located. This feedback mechanism ensures the driver is aware of the display switch and can locate the warning information, preventing missed information while maintaining rapid response capability.
3Adaptability or versatility
If both virtual and real image display units are used, then the driver can receive various types of information, but the complexity of the display system increases
Solution Approach 1:
The arrow guidance element serves multiple functions: it guides the driver's line of sight, indicates the type of image being displayed (virtual or real), and can be displayed in either the virtual or real image space. This multi-functionality allows the system to maintain versatility in displaying different information types while reducing overall complexity by using a single, versatile guidance mechanism.
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
Prevents missing of warning information by effectively guiding the driver's focus to the correct image type, enhancing visibility and ensuring that critical information is noticed during both low-speed and high-speed operations.
Implementation Method 1
a first light modulator that spatially modulates light that is emitted from a light source on the basis of input first image data
Implementation Method 2
a second light modulator that spatially modulates light that is emitted from a light source on the basis of input second image data
Implementation Method 3
a first projection optical system that projects the spatially modulated light onto a projection surface of the vehicle to display a virtual image
Implementation Method 4
a second projection optical system that projects the spatially modulated light onto a projection surface of the vehicle to display a real image
Data Source
AI summary
Provided are a projection type display device, a display control method thereof, and a display control program thereof capable of preventing missing of warning information even in a case where display of warning information using a virtual image and display of warning information using a real image are switched. During a low speed run, warning information A1 is displayed on a windshield 6 using a real image Ir, and guidance information G1 is displayed in front of the windshield 6 using a virtual image Iv. During a high speed run, warning information A2 is displayed in front of the windshield 6 using the virtual image Iv, and guidance information G2 is displayed on the windshield 6 using the real image Ir.