Transparent Display Alignment for Parallax-Free Vehicle HUDs
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Solution Overview
Problem
Traditional aircraft head-up displays (HUDs) suffer from issues such as bulky equipment, high power consumption, limited fields of view, and reduced implementation flexibility due to fixed positioning, which cause optical misalignment and parallax, leading to pilot confusion and misidentification of external objects.
Innovation Solution
A transparent display alignment system that positions graphic objects on a transparent display to intersect with the user's line of sight to external objects, eliminating parallax without collimating optics, and allowing flexible positioning relative to the user's head, using a fixed or tracked eye-point embodiment with real-time adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional collimating HUD optics are used to eliminate parallax, then parallax is reduced, but device size and complexity increase
Solution Approach 1:
The patent replaces traditional collimating optical systems with a computational geometry approach. Instead of using complex optical components to physically eliminate parallax, the system uses software algorithms to calculate and compensate for parallax effects by determining the correct display position based on eye position, vehicle position, and external object position coordinates.
Solution Approach 2:
The patent creates a virtual representation of the external scene on the transparent display at a calculated position that accounts for parallax. The system computes a parallax-free position on the display that corresponds to the actual external object position, effectively copying the external scene's spatial relationships into the display coordinate system without requiring physical optical correction.
2Reliability
If HUD is fixed to pilot's head or positioned near eyes to avoid parallax, then parallax is minimized, but implementation flexibility is reduced
Solution Approach 1:
The patent implements a dynamic positioning system that adapts to different eye positions, vehicle positions, and external object positions in real-time. Instead of fixing the HUD to the pilot's head or positioning it at a fixed distance from the eyes, the system continuously calculates the optimal display position based on current geometric relationships, allowing the display to move dynamically with the pilot's head and eyes while maintaining parallax-free viewing.
Solution Approach 2:
The system changes the display position parameters dynamically based on input from eye tracking, vehicle position sensors, and external object detection. By adjusting the displayed object's position on the transparent display according to real-time geometric parameters, the system maintains parallax-free viewing across different pilot positions and viewing angles without requiring physical repositioning of the display.
3Adaptability or versatility
If transparent display is positioned far from pilot's head, then implementation flexibility increases, but parallax effects increase
Solution Approach 1:
The patent employs feedback mechanisms from eye position sensors, vehicle position sensors, and external object detection systems to continuously monitor and adjust the display position. This feedback loop allows the system to compensate for the increased distance between the display and pilot's head by dynamically recalculating the parallax-free position based on actual viewing geometry, thereby maintaining accurate alignment even when the display is positioned flexibly away from the head.
Data Source
AI summary
A method is performed using a transparent display alignment system in a vehicle. The transparent display alignment system includes a transparent display through which a user's eyes behind the transparent display view an external scene in front of the transparent display. The method comprises: receiving an eye position of the eyes, a vehicle position for the vehicle, and an external object position of an external object in the external scene; computing a parallax-free position on the transparent display that intersects with a line-of-sight from the eye position to the external object position through the transparent display, at least based on the eye position, the vehicle position, and the external object position; and positioning a graphic object on the transparent display at the parallax-free position to align the eye position, the graphic object, and the external object to avoid parallax when the eyes view the external object through the transparent display.