Movable Screen Head-Up Display Optical Path Correction
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Solution Overview
Problem
Existing head-up display systems for vehicles face a decrease in the degree of matching between the projection plane and the virtual image when the projection plane is tilted with respect to a reference plane, leading to unnatural projection of virtual images on the windshield.
Innovation Solution
A display system comprising a movable screen, a drive control unit, and a projection unit that adjusts the optical path length based on the tilt angle of the projection plane, ensuring the screen moves to maintain optimal image projection even when tilted, using a scanning light beam and a control circuit to synchronize the movement with the projection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projection plane is tilted with respect to a reference plane, then the display system can adapt to different road grades and viewing conditions, but the degree of matching between the projection plane and the virtual image decreases
Solution Approach 1:
The patent applies the dynamics principle by making the screen movable in the movement direction rather than fixed. The drive control unit dynamically adjusts the screen position to vary the optical path length according to the tilt angle, enabling the system to adapt to different road grades while maintaining proper virtual image matching. This resolves the contradiction by allowing the system to be both adaptable to tilted planes and precise in image projection.
2Manufacturing precision
If the screen is moved to adjust the optical path length according to tilt angle, then the degree of matching between projection plane and virtual image is maintained, but the device complexity increases
Solution Approach 1:
The patent applies segmentation by separating the screen function from the projection unit. The screen is made independently movable with its own drive control unit, while the projection unit remains separate. This modular segmentation allows the screen to be adjusted for optical path compensation without complicating the projection mechanism, resolving the contradiction between maintaining precision and avoiding excessive complexity.
Solution Approach 2:
The patent replaces complex mechanical adjustment mechanisms with a controlled movement system. Instead of using intricate mechanical linkages to adjust the projection angle, the system uses a drive control unit to move the screen in the movement direction, varying the optical path length in a simpler, more controllable manner while maintaining the degree of matching.
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
This solution enhances the degree of matching between the projection plane and the virtual image, preventing unnatural projections and maintaining clear, accurate display of driver assistance information even on tilted surfaces.
Implementation Method 1
The projection unit renders an image on the screen by irradiating the screen with a light beam that scans the screen
Implementation Method 2
projects a virtual image onto a projection plane with the light beam transmitted through the screen
Implementation Method 3
a reflective member for reflecting the light beam coming from the projection unit
Data Source
AI summary
A display system according to an aspect includes a screen, a drive control unit, and a projection unit. The drive control unit has the screen moved in a movement direction. The projection unit renders an image on the screen by irradiating the screen with a light beam that scans the screen and projects a virtual image onto a projection plane with the light beam transmitted through the screen. The drive control unit has the screen moved in the movement direction such that an optical path leading to a rendering point on the screen varies its length according to a tilt angle defined by the projection plane with respect to a reference plane.