Head-Up Display Virtual Image Depth Adjustment
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Solution Overview
Problem
Existing head-up display (HUD) devices burden viewers with difficulty in recognizing additional virtual images, as they require shifting the line of sight to distinguish between images displayed at the same distance, leading to increased visual effort and reduced safety during vehicle travel.
Innovation Solution
The HUD device adjusts the display distance of virtual images, allowing additional images to be displayed at different depths from existing ones, enabling easier recognition by maintaining distinct focus on each image, thereby reducing visual burden.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If multiple virtual images are displayed at the same display distance, then information transmission capacity is improved, but recognition ease deteriorates because the viewer needs to shift line of sight to distinguish between images
Solution Approach 1:
The patent applies depth dimensionality by displaying virtual images at different display distances (depth positions) rather than the same plane. The display distance determination unit assigns different depth values to different virtual images, allowing them to be distinguished without line of sight shifting while maintaining high information transmission capacity.
Solution Approach 2:
Each virtual image is assigned a specific display distance property that differentiates it from others. The display addition determination unit and display distance determination unit work together to assign local depth characteristics to each image based on its importance and type, making recognition easier while preserving information richness.
2Loss of information
If the viewer shifts line of sight to identify additional virtual images, then information recognition is improved, but visual burden increases
Solution Approach 1:
By utilizing the depth dimension through varied display distances, the patent enables the viewer to perceive different virtual images at different focal planes without lateral line of sight shifts. This reduces visual burden while maintaining effective information recognition.
Solution Approach 2:
The system preliminarily determines the display distance for each virtual image before display based on its importance and type. This pre-arranged depth positioning allows the viewer's eye to naturally focus on relevant information without active line of sight adjustment, reducing visual effort.
Data Source
AI summary
The purpose of the present invention is to enable information presented by an additionally displayed virtual image to be displayed in an easily recognizable manner. A projection unit projects, towards a projection-receiving part, display light capable of displaying virtual images in positions having different display distances from a viewer. A display distance determination unit is capable of adjusting, in a depth direction, the display distances of the virtual images displayed by the projection unit. If a display addition determination unit determines that a virtual image is to be additionally displayed, the display distance of an existing virtual image already displayed and the display distance of a virtual image to be additionally displayed are made to be different.