Projector Imaging Optical System Magnification Compensation
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Solution Overview
Problem
The existing projector and display systems face a reduction in image quality due to differences in optical-path length between the image forming unit and the imaging optical system, leading to issues like image inclination and distortion.
Innovation Solution
A projector design is implemented where the magnification power at the point of the imaging optical system where image light is incident is higher than at the point where image light is emitted, and the optical-path length between the image forming unit and the imaging optical system is shorter, ensuring consistent image quality by adjusting the free-form surface mirror's configuration to compensate for the curved windshield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the optical-path length between the image forming unit and the imaging optical system is shortened, then the device size is reduced, but image quality deteriorates due to magnification differences
Solution Approach 1:
The patent applies local quality by setting different magnification powers at different locations of the imaging optical system. Specifically, the magnification power at the center portion is set to be higher than at the edge portions, which compensates for the optical-path length differences and maintains uniform image quality across the entire field of view while allowing a compact device design.
2Manufacturing precision
If the magnification power is increased at the center portion of the imaging optical system, then image quality is improved, but image distortion occurs at the edge portions
Solution Approach 1:
The patent resolves this contradiction by implementing location-dependent magnification control. The magnification power is set to be higher at the center portion and gradually decrease toward the edge portions of the imaging optical system. This non-uniform magnification distribution compensates for the shorter optical-path length at the center while preventing excessive magnification at the edges, thereby maintaining overall image quality without significant distortion.
Solution Approach 2:
The patent applies parameter changes by dynamically adjusting the magnification power parameter across different regions of the imaging optical system. By varying the magnification power from center to edge, the system optimizes image quality at each location while maintaining a compact optical-path length, thus resolving the contradiction between image quality improvement and distortion prevention.
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 configuration prevents image quality deterioration and maintains a stable, upright virtual image projection, enhancing the display system's performance and usability in mobile objects like vehicles.
Implementation Method 1
an imaging optical system configured to form an image by reflecting the image light
Data Source
AI summary
A projector includes an image forming unit configured to emit image light that forms an image and an imaging optical system configured to form an image by reflecting the image light. S magnification power at a point of the imaging optical system where the image light is incident and optical-path length between the image forming unit and the imaging optical system is short is made higher than a magnification power at a point of the imaging optical system where the image light is incident and the optical-path length between the image forming unit and the imaging optical system is long.