Monocular Head-Up Display Projection Region Limiting Unit
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Solution Overview
Problem
Monocular head-up displays (HUDs) face challenges in providing a clear and easy-to-view interface due to binocular parallax, where the depth position of the background image differs from the virtual image, making it difficult to simultaneously confirm operation information and external environment information without eye convergence.
Innovation Solution
A display apparatus with a projection region limiting unit and a semi-transmissive reflective unit, where the light flux is projected towards one eye, limiting the projection region and imaging plane distance to less than 250 mm, allowing for easy viewing by eliminating binocular parallax and enabling a compact design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If a special optical system is used to limit the projection region in a monocular HUD, then the display region can be narrowed, but the device complexity increases and the ease of operation deteriorates due to binocular parallax
Solution Approach 1:
The patent extracts and eliminates the binocular parallax problem by using a projection region limiting unit that directs light flux to only one eye, separating the operational display function from the visual processing complexity. This allows the display region to be narrowed while maintaining ease of viewing by avoiding the need for eye convergence.
Solution Approach 2:
The patent introduces a projection region limiting unit as an intermediary component between the light source and the eye, which controls and directs the light flux to the appropriate eye only. This intermediary device enables precise control of the projection region while simplifying the viewing process by eliminating binocular parallax.
2Volume of moving object
If the imaging plane distance is reduced to less than 250 mm, then the size of the semi-transmissive reflective unit is reduced, but the manufacturing precision requirements increase
Solution Approach 1:
The patent applies parameter changes by setting the imaging plane distance to a specific range (less than 250 mm) to optimize the balance between device size and manufacturing precision. This parameter optimization allows for a compact semi-transmissive reflective unit while maintaining feasible manufacturing tolerances through careful design of the projection region limiting unit.
3Ease of operation
If the projection region is limited to one eye, then binocular parallax is eliminated and ease of viewing is improved, but the device complexity increases due to the projection region limiting unit
Solution Approach 1:
The patent makes the projection region limiting unit multi-functional by integrating it with the existing optical components of the HUD system. The unit serves both as a projection control device and as part of the overall optical path management system, thereby reducing the net increase in device complexity while achieving one-eye projection to eliminate binocular parallax.
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 solution provides a clear and easy-to-view display by projecting the image directly onto one eye, reducing the size of the semi-transmissive reflective unit, and maintaining image stability even when the viewer's position changes, enhancing safety and usability in vehicles.
Implementation Method 1
The semi-transmissive reflective unit is configured to reflect the light flux emitted from the projection region limiting unit
Data Source
AI summary
According to one embodiment, a display apparatus projects a light flux including image information toward one eye. The apparatus includes an image formation unit and a projection unit. The image formation unit is configured to emit the light flux. The projection unit includes a projection region limiting unit and a semi-transmissive reflective unit. The projection region limiting unit is configured to limit a width of the light flux emitted from the image formation unit. The semi-transmissive reflective unit is configured to reflect the light flux emitted from the projection region limiting unit. A distance between the semi-transmissive reflective unit and an imaging plane of the light flux is not more than 250 mm.