Projection Optical System Edge Magnification Brightness
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Laser scanning type image projection devices face limitations in increasing the angle of view without reducing image brightness, as enlarging the angle of view with optical systems like lenses results in reduced laser power at the edges due to safety standards, leading to a darker projected image.
Innovation Solution
A projection optical system with an optical component that enlarges the projection angle of view, where the magnification ratio from the scanning angle to the projection angle is greater than 1, particularly designed to increase magnification towards the image edges, preventing reduction in scanning speed and maintaining brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the angle of view is enlarged by using an optical system such as a lens, then the angle of view of the projected image is increased, but the image of the laser beam at the MEMS mirror position becomes smaller by lateral magnification, causing the AEL to be lowered and the brightness to be limited
Solution Approach 1:
The patent applies local quality by making the magnification vary across different regions of the optical field. Specifically, the optical system is designed so that the magnification at the edge part of the image is different from the magnification at the central part, with the ratio of edge magnification to central magnification being greater than 1. This non-uniform magnification distribution allows the edge regions to maintain sufficient brightness while still achieving overall angle of view enlargement.
2Area of stationary object
If the swing angle of the MEMS mirror is enlarged to increase the angle of view, then the angle of view is increased, but the swing angle has a limit in reliability
Solution Approach 1:
The patent segments the magnification function across different spatial regions rather than using a single uniform magnification. By dividing the optical field into central and edge regions with different magnification characteristics, the system achieves angle of view enlargement without requiring excessive MEMS mirror swing angles, thereby maintaining reliability.
3Area of stationary object
If the image of the laser beam is reduced in size to enlarge the angle of view, then the angle of view is increased, but the AEL is lowered and the laser power is limited, resulting in a darker projected image
Solution Approach 1:
The patent changes the magnification parameter spatially across the optical field. Instead of using a fixed magnification value, the system implements a magnification profile where the magnification ratio varies from the center to the edges of the field of view. This parameter change allows the edge regions to have higher effective magnification, compensating for the laser power limitations imposed by safety standards and maintaining image brightness.
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 design enables the projection of a more uniform and brighter image while adhering to safety standards by increasing laser power at the edges and maintaining image quality without distortion.
Implementation Method 1
the angle of view is enlarged by using an optical system such as a lens
Data Source
AI summary
The present disclosure relates to a projection optical system and an image projection device capable of projecting a more uniform and brighter image. The image projection device includes a laser light source for outputting a laser beam, a scanning unit for performing scanning with the laser beam two-dimensionally, and an optical component for enlarging a projection angle of view of an image projected by performing the scanning at a predetermined magnification relative to a scanning angle of view of the scanning performed by the scanning unit. The optical component is designed so that a ratio of the magnification for enlargement to change the scanning angle of view into the projection angle of view at an edge part of an image to the magnification for enlargement of view at a central part of the image is greater than 1. The present technique is applicable to laser scanning type image projection devices, for example.