Auto-focusing Projection Apparatus Using Distance Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current auto-focusing technologies in projectors are slow due to time-consuming distance computation and lens adjustment processes, particularly with camera auto-focusing methods that require large data processing and system performance consumption.
Innovation Solution
A projection apparatus comprising a light valve, lens module, distance measuring module, lens position detection module, and processor that detects distances and lens positions to determine an effective focus range, allowing the processor to drive the lens module for rapid focus adjustment when the distance is outside this range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional auto-focusing methods (infrared, ultrasonic, or camera-based) are used to obtain distance information, then the focusing function can be achieved, but the processing time is long and system performance is consumed
Solution Approach 1:
The patent extracts only the necessary distance information from the projection image data without requiring complete image capture or complex computation. By taking out only the essential focus-related parameters, the system achieves fast auto-focusing without the time consumption and performance overhead of traditional methods that process entire images or require separate distance sensing hardware.
Solution Approach 2:
The projection apparatus uses its existing imaging system to serve multiple functions: both projecting images and measuring distance for auto-focusing. By making the imaging system universal, the patent eliminates the need for separate infrared sensors, ultrasonic transducers, or camera modules, thereby reducing system complexity and focusing time while maintaining measurement precision.
2Measurement precision
If camera auto-focusing captures and compares entire projection images, then focus accuracy can be achieved, but data processing time increases and system performance is consumed
Solution Approach 1:
The patent extracts only the essential distance and focus information from the projection image data without requiring complete image capture or complex computation. By taking out only the essential focus-related parameters, the system achieves fast auto-focusing without the time consumption and performance overhead of traditional methods that process entire images.
Solution Approach 2:
Instead of processing the entire projection image data, the patent applies partial action by analyzing only the necessary portions of the image data required for focus determination. This selective processing approach maintains focus accuracy while significantly improving processing efficiency and reducing system performance consumption.
Data Source
AI summary
A projection apparatus includes a light valve, a lens module, a distance measuring module, a lens position detection module and a processor. The light valve forms an image beam. The lens module projects the image beam onto a display surface. The distance measuring module detects a distance between the lens module and the display surface to obtain a first distance value. The lens position detection module detects a position of the lens module to obtain a second distance value. The processor receives the first distance value from the distance measuring module, receives the second distance value from the lens position detection module and obtains an effective focus range according to the second distance value.