Projector Brightness Adjustment via Ambient Light Feedback
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Solution Overview
Problem
Projectors face challenges in maintaining image quality due to ambient brightness, as details in dark areas can be affected and become indistinguishable in bright environments, leading to black shadows instead of visible details.
Innovation Solution
A projector system comprising a light sensor, micromirror device, and light source, controlled by a processor that adjusts the duty cycle and driving current to enhance the brightness of non-black pixels, and performs image processing to ensure pixel brightness falls within ambient and extreme brightness limits, thereby improving image details and resilience to ambient brightness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the projector operates in a bright environment, then the ambient brightness is high, but the details in dark areas of the image become indistinguishable and appear as black shadows
Solution Approach 1:
The patent employs a light sensor to detect ambient brightness and feeds this information back to the processor, which then adjusts the driving current of the light source and the duty cycle of the micromirror device accordingly. This closed-loop feedback mechanism enables the system to adapt to varying ambient lighting conditions and maintain image quality.
Solution Approach 2:
The patent changes key operating parameters including the driving current of the light source and the duty cycle of the micromirror device based on ambient brightness detection. By dynamically adjusting these parameters, the system compensates for the washing out effect of ambient light on dark areas of the projected image.
2Loss of information
If the brightness of non-black pixels is increased to overcome ambient brightness, then the image details become visible, but the overall image brightness distribution may be affected
Solution Approach 1:
The patent applies different adjustment strategies to different pixel types. Specifically, it targets non-black pixels that are affected by ambient brightness while preserving the overall brightness distribution. The processor selectively adjusts the driving current and duty cycle to enhance only the affected areas without compromising the global image characteristics.
Solution Approach 2:
The system dynamically adjusts the driving current and duty cycle based on real-time ambient brightness detection and image analysis. This dynamic adaptation allows the projector to maintain optimal brightness distribution while ensuring that dark area details remain visible under varying ambient conditions.
3Illumination intensity
If the driving current or duty cycle is increased to enhance image brightness, then the brightness of non-black pixels improves, but the system may reach operational limits
Solution Approach 1:
The patent applies partial adjustments to the driving current and duty cycle rather than maximum adjustment. By making incremental adjustments and evaluating the effect on image brightness, the system achieves the desired enhancement while avoiding unnecessary complexity in control parameter adjustments.
Solution Approach 2:
The light sensor provides continuous feedback on ambient brightness, enabling the processor to make precise, incremental adjustments to the driving current and duty cycle. This feedback mechanism ensures that the system reaches the optimal brightness level without unnecessary complexity in the control process.
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 enhances image quality by ensuring that dark area details are preserved and not affected by ambient brightness, maintaining image clarity across varying environments.
Implementation Method 1
The light sensor senses an ambient brightness
Implementation Method 2
The micromirror device is controlled by a duty cycle
Implementation Method 3
The light source is controlled by a driving current
Data Source
AI summary
A projector includes a light sensor, a micromirror device, a light source and a processor. The light sensor senses an ambient brightness. The micromirror device is controlled by a duty cycle. The light source is controlled by a driving current. The processor receives an image including a plurality of non-black pixels. When a brightness of at least one of the non-black pixels is lower than the ambient brightness, the processor increases one of the duty cycle and the driving current. When the brightness of at least one of the non-black pixels is still lower than the ambient brightness after adjustment, the processor increases another one of the duty cycle and the driving current. When the brightness of at least one of the non-black pixels is still lower than the ambient brightness after adjustment, the processor performs an image processing process for the brightness of the non-black pixels.