Dynamic Aperture Control for Projection Luminance and Contrast Balance
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Solution Overview
Problem
Projection devices face challenges in balancing luminance and contrast due to stray light, which degrades imaging quality and user experience, especially in dynamic images where quick light-dark transitions are common.
Innovation Solution
A projection device with a module that acquires both projection and environmental images, and adjusts an aperture to control light flux, mitigating stray light impacts and optimizing the relationship between contrast and luminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the aperture is opened wider to increase luminance, then the brightness of the projection image is improved, but stray light increases and contrast deteriorates
Solution Approach 1:
The patent implements dynamic aperture adjustment based on real-time detection of projection image luminance and contrast characteristics. The aperture size is not fixed but continuously adapted to optimize the balance between luminance and contrast by regulating light flux in response to changing projection conditions
Solution Approach 2:
The system employs a feedback mechanism where the projection image is continuously monitored, and the aperture adjustment is guided by the detected image quality parameters. This closed-loop control enables the system to automatically optimize the aperture setting to maintain optimal luminance-contrast balance
2Object-affected harmful factors
If the aperture is closed to reduce stray light and improve contrast, then contrast is improved, but luminance decreases
Solution Approach 1:
The aperture is dynamically adjusted rather than fixed, allowing the system to adapt aperture size to specific projection content requirements. This enables selective optimization where contrast is prioritized for certain image types while luminance is maintained for others
Solution Approach 2:
The system changes the aperture parameter (opening size) based on detected image characteristics and projection conditions. By dynamically modifying this physical parameter, the system optimizes the trade-off between stray light reduction and luminance maintenance
3Device complexity
If a fixed aperture setting is used, then device complexity is reduced, but the ability to balance luminance and contrast under different conditions deteriorates
Solution Approach 1:
The system performs self-adjustment of the aperture based on automatic detection and analysis of the projection image. The projection device itself generates the control signal for aperture adjustment, eliminating the need for complex external control mechanisms while maintaining adaptability
Solution Approach 2:
The aperture control mechanism serves multiple functions: it regulates overall light flux for luminance control, filters stray light for contrast improvement, and adapts to different projection conditions. This multi-functionality is achieved through a single integrated control system
Data Source
AI summary
Embodiments of the present application relate to the technical field of projection, and in particular, relate to a projection method and a projection device. The projection method includes: acquiring a projection image and an environmental image when a screen picture is projected to a projection region, wherein the environmental image includes an image when a predetermined projection screen picture is projected to the projection region or an image when no screen picture is projected to the projection region; regulating an aperture based on the projection image and the environmental image, wherein the aperture is configured to control a light flux projected to the projection region. Therefore, by adjusting the light flux, impacts caused by the stray light may be mitigated, and a relationship between projection contrast and luminance may be better coordinated, such that the projection contrast and luminance are effectively balanced and hence projection quality is improved.