Phase-Modulated Projection for Dynamic Screen Geometry
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Solution Overview
Problem
Existing digital projection systems require a static screen geometry and are prone to image distortion when the screen position or orientation changes, necessitating time-consuming alignment adjustments.
Innovation Solution
Utilizing a phase light modulator (PLM) to dynamically steer light based on spatially-varying phase modulation, allowing projection on surfaces with arbitrary geometry and fast response times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static screen geometry is used with traditional projection systems, then alignment is simplified, but the system cannot adapt to dynamic screen positions or orientations
Solution Approach 1:
The patent implements dynamic screen geometry adaptation by allowing the projection system to dynamically adjust the projected image parameters (position, orientation, size, shape) in real-time based on detected screen characteristics. The controller continuously receives screen geometry data and updates projection parameters accordingly, transforming a static projection system into a dynamic one that adapts to changing screen configurations.
Solution Approach 2:
The system employs feedback mechanisms where a camera or sensor detects the actual screen position and orientation, feeds this information back to the controller, which then adjusts the projection parameters to compensate for deviations. This closed-loop feedback ensures the projected image maintains correct alignment and focus despite changes in screen geometry or projector position.
2Manufacturing precision
If alignment adjustments are made to maintain image quality on a static screen, then image quality is preserved, but time is lost during repositioning
Solution Approach 1:
The system performs preliminary detection of screen geometry using a camera or sensor before projection begins. By pre-characterizing the screen position, orientation, and shape, the controller can pre-calculate the appropriate projection parameters, eliminating the need for time-consuming manual alignment adjustments when the screen is repositioned.
Solution Approach 2:
The patent replaces manual mechanical alignment adjustments with an automated optical-digital system. Instead of physically repositioning lenses or adjusting mechanical focus knobs, the system uses a camera to detect screen geometry and a controller to computationally determine and apply the correct projection parameters, significantly reducing alignment time.
3Illumination intensity
If light attenuation is used to create image levels in amplitude modulation systems, then image brightness is controlled, but light efficiency is reduced
Solution Approach 1:
The patent changes the fundamental parameter used for image creation from light intensity (amplitude) to light phase. By modulating the phase of light waves and using interference patterns to create the image, the system avoids attenuating light to control brightness, thereby maintaining high light efficiency while achieving precise image level control through phase differences rather than amplitude reduction.
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 projection systems to adapt to dynamic screen geometries, reducing alignment time and maintaining image quality across varying screen configurations.
Implementation Method 1
Utilizing a phase light modulator (PLM) to dynamically steer light based on spatially-varying phase modulation
Data Source
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AI summary
A projection system and method includes a light source configured to emit a light in response to an image data; a phase light modulator configured to receive the light from the light source and to apply a spatially-varying phase modulation on the light, thereby to steer the light and generate a projection light; and a controller configured to dynamically determine, based on at least one of a user input or a sensor signal, a target geometry of a projection surface on which the projection light is projected, determine, based on the target geometry, a phase configuration for a frame of the image data, and provide a phase control signal to the phase light modulator, the phase control signal configured to cause the phase light modulator to generate the projection light in accordance with the phase configuration for the frame.