Dual Projector System for Shadow-Free Close Projection
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Solution Overview
Problem
In close projection systems, objects such as hands or pointing bars near the light receiving surface can create long shadows, disrupting image display due to the inclination of light entering the surface, which is not effectively mitigated by existing technologies.
Innovation Solution
A dual-projector system where the first and second projectors direct light along the light receiving surface, overlapping their images to ensure continuous illumination, even when an object contacts the surface, with detection units to adjust light supply based on blockages, reducing shadow effects and maintaining image congruity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a single projector is used for close projection, then the projection distance is shortened and the space required is reduced, but long shadows are produced when objects contact the light receiving surface
Solution Approach 1:
The patent divides the projection system into multiple projectors (first projector and second projector) positioned at different locations. Each projector independently projects light onto the light receiving surface, creating overlapping illumination areas. When an object blocks light from one projector, the other projector continues to illuminate the affected area, thereby eliminating long shadows while maintaining close projection capability.
2Length of stationary object
If light is directed at a high angle to enable close projection, then the projection distance is reduced, but the shadow length of objects increases
Solution Approach 1:
The patent introduces a spatial dimension by positioning multiple projectors at different locations and angles relative to the light receiving surface. The first projector and second projector are arranged such that their light paths create overlapping coverage areas. This multi-dimensional arrangement ensures that when an object blocks light from one direction, light from another direction can still reach the surface, effectively reducing shadow length while maintaining short projection distance.
3Object-generated harmful factors
If multiple projectors are used to eliminate shadows, then shadow effects are reduced, but the complexity of the system increases
Solution Approach 1:
The patent combines multiple projectors into a unified projection system where the first projector and second projector work together to illuminate the light receiving surface. The projectors are positioned and angled to create overlapping illumination areas, and their outputs are merged to form a complete image without shadows. This merging approach eliminates shadow effects while managing system complexity through coordinated operation of the projectors.
Data Source
AI summary
A projection system includes a first projector and a second projector configured to project light on a light receiving surface according to an image signal. The first projector and the second projector direct light to be supplied to the light receiving surface in a direction along the light receiving surface. A part of an image projected by the first projector overlaps with a part of an image projected by the second projector on the light receiving surface.