Projector Luminance Adjustment Using Image Size and Ambient Light
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Solution Overview
Problem
Existing automatic light adjustment mechanisms in projectors fail to consider the impact of projected image size in conjunction with ambient light intensity, leading to inadequate luminance adjustment and potential eye fatigue.
Innovation Solution
A projection system that incorporates an image-capturing device and a processing unit to detect both ambient luminance and projected image size, adjusting the illumination light source output power based on the calculated projection position and ambient luminance using a look-up table.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If existing automatic light adjustment mechanism only considers ambient light intensity, then the adjustment mechanism is simple, but the luminance adjustment is inadequate and causes eye fatigue
Solution Approach 1:
The system uses an image-capturing device to capture the projected image and calculate its size based on the target object's position in the captured image. This feedback loop allows the system to continuously monitor both ambient luminance and projected image size, then adjust the illumination light source output power accordingly to maintain appropriate luminance levels and prevent eye fatigue
Solution Approach 2:
The system changes the output power parameter of the illumination light source based on two variables: ambient luminance and projected image size. By dynamically adjusting this parameter according to the calculated projection position and captured image analysis, the system achieves more accurate luminance control that prevents both excessive brightness and excessive darkness
2Illumination intensity
If the projected image size is small, then the luminance appears relatively bright, but existing systems cannot adjust appropriately when ambient light is strong
Solution Approach 1:
The system adjusts the illumination light source output power by considering both ambient luminance and projected image size simultaneously. When the projected image is small and ambient light is strong, the system reduces output power to prevent excessive brightness. Conversely, when the projected image is large and ambient light is weak, the system increases output power to maintain adequate luminance, achieving adaptive luminance control across different conditions
3Illumination intensity
If the projected image size is large, then the luminance appears relatively dark, but existing systems cannot adjust appropriately when ambient light is weak
Solution Approach 1:
The system dynamically adjusts the illumination light source output power based on the combination of ambient luminance and projected image size. When the projected image is large and ambient light is weak, the system increases output power to compensate for the larger image area distributing light more thinly, thereby maintaining adequate luminance levels for comfortable viewing
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
Optimizes image luminance by considering both ambient light and projected image size, reducing eye fatigue and improving viewing comfort by maintaining appropriate luminance levels.
Implementation Method 1
An image-capturing device is driven to perform image capturing toward the projection target to obtain a captured image
Implementation Method 2
A projection device is driven to project an image on a projection target. An output power of an illumination light source module of the projection device is adjusted
Data Source
AI summary
A method for adjusting a projection device and a projection system are provided. A projection device is driven to project an image on a projection target. An image-capturing device is driven to perform image capturing toward the projection target to obtain a captured image. The captured image includes a target object corresponding to the image. A projection position of the target object in the captured image is calculated based on the target object and the captured image. An output power of an illumination light source module of the projection device is adjusted based on the projection position and an ambient luminance.