HUD Guide Lights Speed Limit Visual Feedback
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Solution Overview
Problem
Drivers may mistakenly recognize speed limits due to overlooking road signs or misinterpreting speed displays, leading to potential violations of speed laws.
Innovation Solution
A head-up display device with a projector and light sources that project a display image onto a reflecting plate, including guide lights and a warning pattern, which changes lighting states and patterns based on the differential between the vehicle's speed and the speed limit, providing visual cues to the driver.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the driver reads numerical values from the speed meter to grasp the relationship between current speed and speed limit, then the information is accurate, but the driver's attention is diverted from the road and the operation becomes complex
Solution Approach 1:
The patent uses guide lights that copy the visual appearance of road speed limit signs and creates a visual representation of the speed comparison result (excessive speed warning) that replaces the need for the driver to read and interpret numerical values from the speed meter
Solution Approach 2:
The patent employs color-coded guide lights (typically green for normal speed, yellow for approaching limit, red for excessive speed) to visually indicate the relationship between current speed and speed limit, allowing the driver to instantly grasp the speed status without reading numbers
2Measurement precision
If the driver focuses on the speed meter display to monitor vehicle speed, then the speed reading is clear, but the driver's sight line must be moved and focus adjustment is required
Solution Approach 1:
The patent merges the speed monitoring function with the existing HUD (Head-Up Display) system, allowing the speed comparison information to be displayed in the driver's forward view through the combiner, so the driver can monitor speed status without moving the sight line from the road
Solution Approach 2:
The patent uses the combiner as an intermediary optical element that reflects the guide light images into the driver's line of sight, serving as a mediator between the speed monitoring system and the driver's visual field without requiring focus adjustment
3Reliability
If traditional speed display methods are used, then the information is straightforward, but the driver may mistakenly recognize speed limits due to oversight of road signs
Solution Approach 1:
The patent provides immediate visual feedback through guide lights that continuously indicate whether the current speed is within the limit or excessive, reinforcing the driver's awareness of the speed limit and the relationship between current speed and the limit
Solution Approach 2:
The patent displays guide lights in advance to warn the driver before the vehicle exceeds the speed limit, allowing the driver to take corrective action proactively rather than reacting after the violation occurs
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
Enables drivers to easily grasp the relationship between their vehicle's speed and the speed limit without needing to read numerical values, reducing the risk of exceeding speed limits through a novel and attention-catching visual display.
Implementation Method 1
the display light from the projector is reflected by the reflecting plate in a viewing direction to define a display area on the reflecting plate
Implementation Method 2
the emitted light from the first light sources is reflected by the reflecting plate in the viewing direction to display a pair of first guide lights side by side adjacent to the display area on the reflecting plate
Data Source
AI summary
A pair of first guide lights are displayed side by side adjacent to an HUD display area with emitted light from first light sources, and a pair of second guide lights are displayed at the outer sides of the respective first guide lights with emitted light from second light sources. At least one of the number of lighting lights, the lighting cycle, and the lighting order of the first light sources and the second light sources is changed in accordance with a differential value between the current speed and a speed limit set for a road on which the vehicle is traveling.