Projection Device Brightness Adjustment via Image Capture
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Solution Overview
Problem
Existing projection devices struggle to accurately adjust brightness due to the placement of photosensitive elements, which can lead to discomfort for users, especially when the ambient light changes only in specific areas, such as when lamps in a meeting room are turned on or off, as the photosensitive element cannot accurately sense the ambient light at the user's location.
Innovation Solution
A projection device equipped with a projection unit, an image capture device, and a control unit that captures an image of the projection area and surrounding environment, allowing the control unit to determine brightness adjustments based on variations in the image capture picture, ensuring proper light source adjustment according to ambient brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a photosensitive element is disposed on the back side of the projection device to detect ambient light, then the device structure is simple and energy saving is achieved, but the photosensitive element cannot sense accurate ambient light at user location causing eye discomfort
Solution Approach 1:
The patent uses the projection image itself as an intermediary to indirectly sense ambient light changes. Instead of placing a photosensitive element directly at user location, the system projects an image, captures it with a camera, and analyzes brightness changes in the captured image to infer ambient light conditions, thereby solving the measurement precision problem without increasing device complexity
Solution Approach 2:
The patent replaces the direct mechanical/photosensitive sensing system with an optical-capture-analysis system. Instead of using a photosensitive element to directly detect ambient light, the system uses projection + camera capture + image analysis to substitute the sensing mechanism, achieving accurate ambient light detection without additional photosensitive components
2Ease of manufacture
If the photosensitive element is installed on the upper cover facing the ceiling, then the device structure is simple, but the photosensitive element cannot sense real ambient brightness causing misjudgment
Solution Approach 1:
The projection image serves as an intermediary that reflects ambient light conditions. By capturing and analyzing the projection image rather than directly sensing ambient light, the system obtains reliable brightness information without requiring the photosensitive element to be positioned in specific locations, thus maintaining installation simplicity while improving sensing reliability
Solution Approach 2:
Instead of directly sensing ambient light with a photosensitive element positioned to face the environment, the patent inverts the approach by projecting an image and sensing the reflected/light-interacted projection image. This indirect sensing method eliminates the need for precise photosensitive element positioning while improving reliability
3Adaptability or versatility
If only front row lamps are turned off while photosensitive element is on back side, then partial ambient light change occurs, but the photosensitive element cannot detect this localized change
Solution Approach 1:
The projection image acts as an intermediary that captures localized ambient light changes. When front row lamps are turned off, the change in ambient light affects the brightness of the projection image in specific regions. By analyzing the captured projection image, the system can detect localized ambient light changes that a back-positioned photosensitive element would miss
Solution Approach 2:
The patent applies local quality analysis by examining specific regions of the captured projection image rather than treating the entire image uniformly. This allows the system to detect localized ambient light changes (such as front row lamps turning off) by analyzing the brightness characteristics of relevant portions of the projection image
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
This solution enables precise brightness adjustments, reducing eye discomfort by accurately sensing ambient light changes, even when the photosensitive element is not directly positioned at the user's location, thereby improving the overall brightness adjustment effect.
Implementation Method 1
obtaining an image capture picture including the image picture in an image capture range
Data Source
AI summary
A projection device including a projection unit, an image capture device and a control unit is provided. The projection unit includes a light source. The projection unit is configured to project an image picture to a projection area. The image capture device is configured to obtain an image capture picture including the image picture in an image capture range. The image capture range is larger than the projection area. The control unit is coupled to the image capture device. The control unit is configured to determine, according to a picture variation value of the image capture picture, whether to adjust the brightness of the light source. In addition, a brightness adjusting method used for the projection device is also provided. According to the disclosure, the brightness of the light source of the projection device may be properly adjusted according to environmental factors.