Head-Up Display Time-Division Depth Control
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Solution Overview
Problem
Conventional vehicular head-up displays face reduced visibility when multiple images, such as pedestrian markers, overlap in the depth direction, as they are displayed in the same plane, leading to a decrease in the clarity of the images.
Innovation Solution
A display device that projects light beams onto a display medium to create virtual images in a space beyond the medium, with a controller managing the display of multiple images in a time-division manner, ensuring they have different depths, thereby enhancing visibility even when they overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple images are displayed in the same plane on the display medium, then the display device can show multiple pieces of information simultaneously, but the visibility and clarity of overlapping images deteriorate
Solution Approach 1:
The patent applies depth perception through parallax effect by displaying different images at different apparent distances from the display medium. The controller calculates parallax amounts based on depth information and shifts images horizontally according to their depth, creating a multi-layered depth effect that resolves the visibility problem of overlapping images while maintaining simultaneous display of multiple images.
2Measurement precision
If multiple images are displayed with different depths using parallax effect, then the visibility of overlapping images is enhanced, but the complexity of the display control system increases
Solution Approach 1:
The patent segments the display control into distinct functional modules: a depth information acquisition unit that obtains depth data for each image, a parallax amount calculation unit that computes horizontal shift amounts based on depth, and a display control unit that applies the calculated shifts. This modular segmentation manages system complexity by dividing the control task into manageable, independent components with clear interfaces.
Solution Approach 2:
The patent replaces complex mechanical depth adjustment mechanisms with a computational approach. Instead of physically moving display elements to create depth effects, the system uses image processing algorithms to calculate parallax amounts and applies horizontal shifts through software control, substituting mechanical complexity with computational simplicity.
3Measurement precision
If images are displayed in a time-division manner, then the visibility of multiple images is improved, but the refresh rate and continuity of display may be reduced
Solution Approach 1:
The patent implements periodic display of multiple images at different depth layers, where images are alternately displayed in synchronization with the refresh cycle of the display medium. The controller coordinates the display timing so that images at different depths are shown in alternating time slots within each refresh period, maintaining visibility improvement while adapting to the display's inherent refresh rate constraints through periodic synchronization.
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
The display device effectively enhances the visibility of multiple images by displaying them at different depths, allowing for clear visualization of overlapping images, such as pedestrian markers, improving the driver's ability to notice pedestrians and navigate.
Implementation Method 1
a display unit that projects a light beam onto a display medium based on image data so that the light beam reflected from the display medium to display one or more virtual images in a space further than the display medium in a depth direction through the display medium
Data Source
AI summary
The display device includes: a display unit that projects a light beam onto a windshield so that the light beam is reflected from the windshield such that one or more virtual images are displayed in a space further than the windshield in a depth direction through the windshield; and a controller that controls the display unit so that a first vertical image and a second vertical image included in the one or more virtual images and have different distances from the windshield in the depth direction, are displayed in a time-division manner.