Adjustable Mirror Optical System for Compact Head-Up Display
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Solution Overview
Problem
Head-up display (HUD) devices for vehicles face challenges in accommodating varying eye points of drivers without increasing the size of the device, as existing designs often require larger optical members to cover a range of eye positions, leading to a larger device footprint.
Innovation Solution
A projection display device with an adjustable optical system featuring a first and second mirror, where the position of at least one mirror surface is adjustable to align with the eye point, and a shielding plate to prevent unwanted light paths, allowing for continuous display image projection without enlarging the device. This system includes an optical member for processing light at the convergence point and optional measuring or input units for eye point adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the size of the optical member is increased to ensure a large incident range, then the ability to accommodate various eye points is improved, but the size of the entire HUD device is increased
Solution Approach 1:
The patent employs adjustable mirrors that can dynamically change their position or angle to redirect light paths. This dynamic adjustment allows the optical system to adapt to various eye points without requiring a large fixed optical member, thereby resolving the contradiction between adaptability and device size.
Solution Approach 2:
The patent introduces a light redirecting element (such as a prism or additional mirror) that acts as an intermediary to change the direction of light paths. This intermediary component enables the light to reach different eye points through redirected paths rather than requiring a large incident range on the original optical member.
2Adaptability or versatility
If the size of the optical member is increased to cover a range of eye positions, then the coverage of eye points is improved, but the device footprint is increased
Solution Approach 1:
The adjustable mirror mechanism allows the optical system to dynamically reconfigure light paths for different eye positions. This dynamic capability enables comprehensive eye point coverage without requiring a large static optical member, thus reducing the overall device footprint.
Solution Approach 2:
The patent utilizes additional spatial dimensions by introducing light redirecting elements that change the direction of light paths in three-dimensional space. This allows the system to cover a range of eye positions by exploiting spatial redirection rather than increasing the size of optical members in the original plane.
3Adaptability or versatility
If various optical paths are formed to cope with various eye points, then the versatility is improved, but the complexity of the optical system is increased
Solution Approach 1:
The adjustable mirror provides a dynamic solution that creates multiple optical paths on demand rather than requiring all paths to be permanently configured. This reduces optical system complexity by using a single adjustable component instead of multiple fixed optical members for different eye points.
Solution Approach 2:
The adjustable mirror serves multiple functions by being able to redirect light to various eye points through a single component. This multi-functionality reduces the need for multiple specialized optical members, thereby simplifying the overall optical system while maintaining versatility.
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
Enables the HUD device to maintain display image projection across various eye points without increasing the device size by narrowing the light incident range on mirrors and optical members, reducing the overall size of the projection display device.
Implementation Method 1
an optical system configured to form an optical path projecting light emitted from the display device toward a predetermined projection position as a display image
Implementation Method 2
a shielding plate configured to prevent the light from reaching the projection position via a different optical path different from the regular optical path
Data Source
AI summary
A projection display device includes a display device, an optical system, and a shielding plate. The optical system includes a first mirror and a second mirror provided on the regular optical path, the second mirrors being to provide an optical path convergence point on the regular optical path, and the first mirrors being provided at a position corresponding to the optical path convergence point. The projection display device is configured such that a position of a mirror surface of the first mirror and the second mirror is adjustable in accordance with a position of an eye point of a user so as to project the light toward the projection position that corresponds to the position of the eye point. The shielding plate is provided such that the shieling plate does not interfere with the regular optical path and such that the shielding plate interferes with the different optical path.