Head-Up Display Size Adjustment for Road Vibration
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Solution Overview
Problem
Existing head-up display systems that reduce the impact of vehicle vibration on visibility are costly due to the requirement of multiple cameras, and there is a need for a more affordable solution that can effectively adjust display sizes based on road surface conditions to enhance driver visibility.
Innovation Solution
A display device and method that includes a display control unit and a surface condition acquisition unit, which adjusts the size of displayed letters or graphics based on the smoothness of the road surface, using information from sensors or map data to optimize visibility during vehicle travel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple cameras (front camera and driver camera) are used to detect vehicle vibration and adjust display position, then visibility deterioration due to vibration is reduced, but system cost increases
Solution Approach 1:
The patent extracts only the essential function needed for vibration detection - using acceleration sensors to detect vehicle vibration directly, rather than using multiple cameras to indirectly detect vibration through image analysis. This extraction of the core function reduces system complexity and cost while maintaining the ability to compensate for vibration effects in the display
Solution Approach 2:
The patent replaces the optical/mechanical camera-based detection system with an electronic sensor-based system (acceleration sensors). This substitution uses electrical signals to detect vibration directly, eliminating the need for complex camera systems, image processing hardware, and associated computational resources, thereby reducing system cost and complexity
2Measurement precision
If display size is reduced to improve visibility on rough roads, then recognition difficulty increases, but if display size is increased, then visibility deterioration due to vibration occurs
Solution Approach 1:
The patent implements dynamic adjustment of display characteristics based on real-time vibration detection. The display control unit continuously monitors acceleration sensor data and dynamically modifies display parameters (such as text size, icon size, or information density) according to the current vibration level. This allows the system to optimize recognition accuracy under varying road conditions without suffering from vibration-induced visibility deterioration
Solution Approach 2:
The patent changes display parameters (size, resolution, information density) based on detected vibration levels. When vibration is detected, the system adjusts these parameters to maintain optimal readability and recognition accuracy, effectively adapting the display output to compensate for the harmful effects of vibration
Data Source
AI summary
A head-up display 2 includes a light source unit 4 and a combiner 9. A control unit 55 of the light source unit 4 displays on the combiner 9 a guide image indicating a letter or a graphic so that the guide image appears to overlap the background visible from a vehicle Ve. On the basis of a detection signal Sd sent from a vibration sensor 3 and the traveling speed of the vehicle Ve, the control unit 55 obtains a smoothness determination index α that is information on the degree of smoothness of the road surface on which the vehicle Ve is traveling. The control unit 55 changes the size of the letter or the graphic displayed on the combiner 9 in accordance with the smoothness determination index α.