Projection Autofocus Using Sub-Area Distance Correction
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Solution Overview
Problem
Projection devices experience interference from obstacles during automatic focusing, leading to poor image quality or partial obstruction of the projection area.
Innovation Solution
A projection device equipped with a distance measuring unit and processor that emits testing light, receives reflected light, generates distance information, and selects corrected distance information to control the optical engine for accurate image projection, avoiding interference from obstacles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If the projection device performs automatic focusing using distance measuring unit, then the focusing is automated, but interference from obstacles causes abnormal focusing and poor image quality
Solution Approach 1:
The patent divides the projection area into multiple sub-areas and performs determining operations on multiple pieces of sub-area distance information to select corrected distance information. This segmentation approach allows the system to identify and exclude obstacle-related distance information while maintaining automated focusing, thereby resolving the contradiction between automation and reliability.
2Device complexity
If the projection device uses distance information from obstacle, then the focusing process is simple, but the projection image quality deteriorates due to incorrect distance data
Solution Approach 1:
The patent implements a feedback mechanism where the processor performs determining operations on multiple pieces of sub-area distance information, selects corrected distance information, and uses this corrected data to control the optical engine for accurate focusing. This feedback loop ensures that incorrect distance information from obstacles is eliminated while maintaining a relatively simple focusing process, thus resolving the contradiction between device complexity and projection image quality.
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
The solution effectively eliminates interference from obstacles, ensuring correct focusing and adjustment of the image range, improving projection quality by preventing the image from covering obstacles.
Implementation Method 1
The distance measuring unit is configured to emit a testing light to the target area and receive a reflected light formed by the reflection of the testing light
Data Source
AI summary
Disclosed are a projection device and a projection method. The projection device includes an optical engine, a distance measuring unit, and a processor. The distance measuring unit is configured to emit testing light to the target area and receive reflected light. The distance measuring unit generates multiple pieces of corresponding distance information according to the reflected lights received and multiple areas of the target area. The processor is configured to: generate area distance information according to the multiple pieces of distance information; select a mode from multiple pieces of sub-area distance information comprised by each piece of area distance information as corrected distance information corresponding to each area; and control the optical engine to project an image beam according to the corrected distance information of each area to form a projected image in the target area.