Head-Up Display Mirror Control for Sunlight and Noise Suppression
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Solution Overview
Problem
Head-up displays (HUDs) using augmented reality (AR) face issues with increased sunlight ingress due to wider display regions, leading to potential damage and operating noise from drive mechanisms, which is particularly disruptive in silent hybrid and electric vehicles.
Innovation Solution
A head-up display apparatus that controls the drive mechanism based on door unlock and ignition signals to minimize operating noise by adjusting the mirror angle and sunlight path, ensuring the drive mechanism operates when the user is outside the vehicle.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the opening on the projection optical path is widened to increase the display region in an AR-HUD, then the display region is widened, but sunlight is more likely to enter through the optical path and damage the display panel
Solution Approach 1:
The patent applies preliminary action by controlling the drive mechanism to operate in advance based on door unlock signals before the user enters the vehicle. The controller judges whether to start displaying video by operating the drive mechanism based on a display start condition when the door unlock signal is received, preventing sunlight from damaging the display panel before the user actually needs to view the display.
Solution Approach 2:
The patent uses the door unlock signal and ignition signal as intermediary conditions to control the drive mechanism operation. These signals serve as mediators between the user's actions and the drive mechanism operation, allowing the system to intelligently determine when operation is necessary and when it should be suppressed to avoid noise discomfort.
2Reliability
If the drive mechanism is operated to adjust the optical path and prevent sunlight from reaching the display panel, then the display panel is protected from damage, but operating noise is generated which causes discomfort to the user
Solution Approach 1:
The drive mechanism is operated in advance when the door unlock signal is received and display start condition is met, but before the user enters the vehicle to experience noise discomfort. This preliminary operation protects the display panel from sunlight while minimizing user exposure to operating noise.
Solution Approach 2:
The controller continuously monitors multiple conditions (door unlock signal, ignition signal, display start condition) to dynamically control the drive mechanism operation. This feedback-based control ensures the drive mechanism operates only when necessary for protection while suppressing operation during conditions that would cause user discomfort.
3Ease of operation
If the drive mechanism operates in response to turning on the ignition in hybrid or electric vehicles, then the HUD functionality is activated, but the operating noise causes discomfort to the user due to the improved silence of these vehicles
Solution Approach 1:
The system performs preliminary operation control by judging whether to start displaying video based on the combination of door unlock signal and display start condition. This preliminary judgment prevents unnecessary drive mechanism operation during ignition on in silent vehicles, activating HUD functionality only when actually needed while avoiding noise discomfort.
Solution Approach 2:
The patent changes the operational parameters of the drive mechanism by introducing multiple control conditions (door unlock signal, ignition signal, display start condition) instead of simple ignition-based activation. This parameter-based control adapts the drive mechanism operation to different vehicle types and usage scenarios, suppressing operation in silent hybrid/electric vehicles during ignition on while maintaining functionality when needed.
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
Suppresses user discomfort from operating noise and protects the display panel from sunlight damage by optimizing the drive mechanism operation timing.
Implementation Method 1
The video light projector projects a video light of a video displayed on the video display to a display region, thereby causing a driver to visually recognize the projected video light as a virtual image
Data Source
AI summary
A head up display apparatus capable of suppressing discomfort to a user caused by an operating noise while preventing damage by sunlight is provided. Further, it contributes to “Goal 3: Ensure healthy lives and promote well-being for all at all ages” in the Sustainable Development Goals (SDGs). Thus, a video light projector 6 includes a drive mechanism 14 and projects video light emitted from a video display 11 to a display region 8, thereby making the projected video light visually recognized as a virtual image. A controller judges whether or not a door unlock signal which is one of information related to a transportation is received, and judges whether or not to cause the video display 11 to start displaying the video by operating the drive mechanism 14 in the video light projector 6 based on a display start condition when the door unlock signal is received.