Projection Device Ranging Unit Obstacle Interference
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Solution Overview
Problem
Projection devices often experience inaccuracy due to interference from obstacles when focusing, leading to keystone correction failures and incorrect focusing on a wrong plane, which severely affects user experience.
Innovation Solution
A projection device and method that utilize an optical engine, a ranging unit, and a processor to emit testing light beams, detect reflected light beams, and generate accurate sensing information to control the image beam projection, ensuring the image is formed within the effective focal length range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the ranging unit emits testing light beams to detect reflected light beams for automatic focusing, then the projection device can automatically focus according to sensing results, but obstacles in front of the projection screen or penetration through the projection screen to the wall surface behind cause abnormal sensing results leading to keystone correction failure or focusing on a wrong plane
Solution Approach 1:
The patent introduces a processor as an intermediary that receives sensing information from the ranging unit and processes it to generate projection distance information. This intermediary processing step filters out abnormal sensing results caused by obstacles or screen penetration, ensuring only valid sensing data is used for focusing and keystone correction, thus resolving the contradiction between automatic focusing and sensing accuracy.
Solution Approach 2:
The system implements a feedback mechanism where the processor continuously monitors sensing information from the ranging unit and adjusts the projection distance information accordingly. When abnormal sensing results are detected (e.g., from obstacles or screen penetration), the feedback loop corrects these anomalies, ensuring accurate focusing while maintaining automatic operation.
2Ease of operation
If the ranging unit uses testing light beams to detect the projection screen, then automatic focusing can be achieved, but interference from obstacles or penetration through the screen causes abnormal sensing results that affect user experience
Solution Approach 1:
The processor serves as a mediator between the ranging unit and the optical engine, processing sensing information to generate reliable projection distance information. This intermediary role ensures that even when the ranging unit encounters obstacles or screen penetration issues, the final focusing operation remains reliable by using corrected sensing data.
Solution Approach 2:
The patent converts the harmful effect of obstacle interference or screen penetration into beneficial filtering by the processor. The processor identifies and rejects abnormal sensing results (the harm) while using valid sensing data for accurate focusing (the benefit), thus transforming potential failure modes into system robustness.
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
Effectively eliminates reflection interference from obstacles, corrects image distortion, and ensures accurate focusing, thereby enhancing user experience by providing clear and properly aligned images.
Implementation Method 1
detect reflected light beams formed by reflection of the testing light beams
Implementation Method 2
The optical engine is configured to project an image beam to form a first image
Data Source
AI summary
A projection device and a projection method thereof are provided. The projection device includes an optical engine, a ranging unit, and a processor. The optical engine projects an image beam to a target area to form a first image. The ranging unit emits testing light beams, detects reflected light beams reflected from the testing light beams, and obtains effective sensing information from the reflected light beams. The processor is coupled to the ranging unit and the optical engine, receives the effective sensing information from the ranging unit, and generates first projection distance information according to the effective sensing information. The processor controls the optical engine so that the first image corresponding to the image beam is located within an effective focal length range of the projection device.