Projection Image Shift Control for Embedded Ghosting Reduction
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Solution Overview
Problem
Existing projection technologies suffer from ghosting issues due to irregular light reflection during image projection, particularly when the projection apparatus is partially or fully embedded in an installation target, leading to unwanted bright shining regions.
Innovation Solution
The projection apparatus includes a processor that acquires information about its installation state and restricts the shifting of the projection image based on this state, including distance to the installation target, light source output, and image content, to minimize ghosting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the projection apparatus is embedded in an installation target to achieve compact integration, then adaptability is improved, but ghosting occurs due to irregular light reflection
Solution Approach 1:
The patent applies local quality by making the projection lens movable relative to the installation target, allowing the projection position to be adjusted locally while keeping the overall embedded structure fixed. This enables optimization of the projection path to avoid direct reflection onto the installation target surface, thereby reducing ghosting while maintaining embedded installation capability
Solution Approach 2:
The patent implements dynamics by enabling the projection lens to shift its position dynamically during operation. The lens can be moved to different positions to change the projection angle and avoid fixed reflection paths, which eliminates ghosting while preserving the embedded installation configuration
2Ease of operation
If the projection image is shifted to avoid obstacles, then ease of operation is improved, but ghosting increases due to changed light reflection paths
Solution Approach 1:
The patent applies feedback by using a detection unit to monitor the installation state and projection environment, then automatically adjusting the lens position or projection parameters based on the detected conditions. This closed-loop control enables obstacle avoidance through image shifting while simultaneously preventing ghosting by selecting optimal projection paths
3Adaptability or versatility
If the projection lens is made movable to adjust projection position, then adaptability is improved, but device complexity increases
Solution Approach 1:
The patent replaces complex mechanical lens shifting mechanisms with alternative approaches such as moving the entire projection optical system or using reflective elements to change projection direction. This substitution reduces mechanical complexity while maintaining the ability to adjust projection position and avoid ghosting
Data Source
AI summary
A projection apparatus that is able to shift a projection image includes: a projection lens; and a processor. The processor is configured to: acquire information related to an installation state of the projection apparatus; and perform a control of restricting shifting of the projection image in accordance with the installation state and a state of a light source of the projection apparatus.