Projection Display Device Focus Adjustment Automation
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Solution Overview
Problem
Conventional projection display devices require manual focus adjustment, which can be cumbersome and anxiety-inducing for users, as they lack efficient methods to ensure accurate focus across the projection screen.
Innovation Solution
A projection display device that includes an optical modulation element, a projection unit, and a control unit to display test pattern images, capture images, and adjust focus, using guidance images to indicate focus adjustment status and degree of focusing in different regions, thereby automating the focus adjustment process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If manual focus adjustment is used, then the device complexity is reduced, but the ease of operation deteriorates and user anxiety increases
Solution Approach 1:
The system automatically performs focus adjustment without requiring manual user intervention. The control unit autonomously controls the optical modulation element to display test pattern images, the image capture element captures these images, and the processing unit automatically processes the captured images to determine optimal focus settings, thereby eliminating the need for manual focus adjustment operations
Solution Approach 2:
The system implements a feedback mechanism where the image capture element continuously captures test pattern images projected on the screen, the processing unit analyzes these images to evaluate focus quality, and the control unit adjusts the optical modulation element based on this analysis. This closed-loop feedback system automatically optimizes focus while providing visual guidance to users about the focusing status
2Ease of operation
If automatic focus adjustment is implemented, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it controls the optical modulation element to display test pattern images, processes signals from the image capture element, and adjusts focus settings based on captured image analysis. By consolidating these diverse functions into a single control unit, the system achieves automatic focus adjustment without proportionally increasing overall device complexity
Solution Approach 2:
The system uses a test pattern image as a simplified copy or representation of the actual content that will be projected. By focusing on this standardized test pattern rather than analyzing complex real-world images, the system can automatically determine focus quality using simpler processing algorithms, thereby reducing the computational complexity required for automatic focus adjustment
3Measurement precision
If test pattern images are displayed for focus adjustment, then the measurement precision of focus is improved, but the productivity deteriorates due to additional adjustment steps
Solution Approach 1:
The system automatically displays test pattern images and performs focus measurement before the user begins actual content projection. The control unit autonomously controls the optical modulation element to display test pattern images, the image capture element captures these pre-adjustment images, and the processing unit analyzes them to determine optimal focus settings in advance, eliminating the need for manual focus adjustment during actual use
Solution Approach 2:
The system rapidly processes the test pattern image capture and analysis to quickly determine focus settings. By using automated image processing algorithms that analyze specific features of the test pattern (such as edge sharpness or pattern recognition), the system can complete focus measurement in minimal time, thereby reducing the overhead of the additional adjustment steps and improving overall productivity
4Measurement precision
If guidance images showing degree of focusing in multiple regions are displayed, then the measurement precision of focus is improved, but the device complexity increases
Solution Approach 1:
The projection screen is divided into multiple distinct regions, and the system independently analyzes the test pattern image in each region. The control unit controls the optical modulation element to display test pattern images that can be segmented into multiple regions, the image capture element captures these segmented images, and the processing unit processes each region separately to determine focus quality for each area, thereby achieving comprehensive focus measurement across the entire screen
Solution Approach 2:
The system combines the focus analysis results from multiple individual regions into a single comprehensive focus adjustment decision. By merging the data from all segmented regions and analyzing their collective focus quality, the control unit can determine optimal focus settings that account for variations across the entire projection screen, achieving high measurement precision without requiring separate adjustment mechanisms for each region
Data Source
AI summary
A projection display device includes an optical modulation element configured to modulate light outputting from a light source, and a projection unit configured to project light modulated by the optical modulation element on a projection screen. The projection display device includes an element control unit that controls the optical modulation element to display a test pattern image, an acquiring unit that acquires an image obtained by capturing the test pattern image from an image capture element that captures the test pattern image projected on the projection screen, and an adjusting unit that adjusts an image projected on the projection screen on the basis of the capture image acquired by the acquiring unit. The element control unit controls the optical modulation element such that a guidance image that guides focus adjustment of the image projected on the projection screen is displayed.