Projector Image Size Preview on Replacement Screen
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Solution Overview
Problem
Installers face challenges in determining the size of a projection image when the projector and projection surface are at different distances, as the distance between the projector and the actual projection surface is unclear, making it difficult to adjust the projector's position accurately.
Innovation Solution
The projector projects an image on a first surface at a known distance, which represents the size of an image that would be projected on a second surface at a different distance, allowing the installer to adjust the projector's position based on the projected image size on the first surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the projector projects an image on a replacement screen at a different distance, then the installer can see the actual projection size, but the distance between the projector and the actual projection surface remains unclear, making position adjustment difficult
Solution Approach 1:
The patent uses a replacement screen as an intermediary object to display the projection image at a known distance from the projector. This replacement screen acts as a mediator that allows the installer to visually assess the projection size and make position adjustments without needing to know the exact distance to the actual projection surface. The control device then calculates the actual projection size based on the geometric relationship between the projector position, replacement screen position, and observed image size.
Solution Approach 2:
The patent replaces direct mechanical measurement of the projection distance with an optical measurement approach. Instead of using physical tools to measure the distance from the projector to the actual projection surface, the system uses the projection image itself displayed on the replacement screen as a visual reference. The control device calculates the actual projection size by substituting the unknown distance measurement with known parameters (replacement screen distance and observed image size ratio).
2Ease of operation
If the installer uses a replacement screen to adjust projector position, then position adjustment becomes possible, but the distance to the actual projection surface is unknown, making it difficult to figure out the projection image size
Solution Approach 1:
The patent implements a feedback mechanism where the control device calculates the actual projection size by comparing the observed image size on the replacement screen with the expected image size at the actual projection distance. This calculated information is fed back to the installer, providing the missing projection distance information indirectly through the projection size ratio. The system continuously monitors and adjusts based on the visual feedback from the replacement screen display.
Data Source
AI summary
A display method includes projecting, by a projector on a first projection surface located at a first distance from the projector, a first image which represents a size of a second image to be projected on a second projection surface by the projector, the second projection surface being located at a second distance, different from the first distance, from the projector.