Polarization-Dependent Light Steering for Wide Projection Displays
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Solution Overview
Problem
Existing projection display systems struggle to extend the screen projection region of an image without lowering the resolution, especially when using multiple projectors, which increases installation and operation costs.
Innovation Solution
A polarization-dependent light steering device-based wide projection display system that uses a single projector to sequentially output images to different regions of the screen in a time division scheme, with a light steering device comprising Fresnel prism arrays that control the output directions of images based on their polarization directions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the distance between the projector and the screen is increased to enlarge the image, then the size of the image on the screen is increased, but the resolution is lowered
Solution Approach 1:
The screen is divided into multiple projection regions, and a single projector sequentially projects images to different regions in a time-division scheme. The light steering device steers light to different regions by controlling the polarization state, effectively segmenting the projection task in time and space rather than using multiple projectors simultaneously
Solution Approach 2:
The light steering device dynamically changes the projection direction by adjusting the polarization state of light in real-time. This dynamic control allows a single projector to cover multiple regions sequentially, maintaining resolution while achieving large-screen projection
2Manufacturing precision
If two or more projectors are used to increase the screen size without lowering the resolution, then the resolution is maintained, but the installation and operation costs increase
Solution Approach 1:
A single projector is made multi-functional through the light steering device, allowing it to project to multiple different regions of the screen by controlling polarization states. This eliminates the need for multiple projectors while maintaining the capability to cover the entire large screen area
Solution Approach 2:
The system changes the polarization state parameter of light to control the projection direction. By modulating the polarization angle, a single projector can steer light to different regions, replacing the need for multiple projectors and reducing system complexity and cost
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 system effectively extends the screen projection region by two or three times or more without lowering the resolution, achieving this at a low cost using a single projector.
Implementation Method 1
a light steering device installed at the rear of the projector and controlling output directions of the images differently according to polarization directions of the images
Implementation Method 2
The plurality of Fresnel prism arrays are stacked along a projection direction of images output from the projector
Data Source
AI summary
Disclosed is a polarization-dependent light steering device based wide projection display system which can extend the screen projection region of an image at low cost without lowering of resolution. A wide projection display system according to an embodiment of the present invention comprises: a projector for sequentially outputting, in a time division scheme, images to be projected to different regions on a screen; and a light steering device installed behind the projector to differently control the output directions of the images according to the polarization directions of the images. The light steering device comprises a plurality of Fresnel prism arrays having polarization dependence. The plurality of Fresnel prism arrays are stacked along the projection direction of images output from the projector.