Projection Illumination Synchronization via Optical Sensors
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Solution Overview
Problem
Existing projection devices face challenges in achieving precise synchronization control between wavelength conversion and filter modules, leading to potential errors in color performance due to manual assembly and reliance on timing marks, which can result in suboptimal image beam output.
Innovation Solution
An illumination system with sensors and a control module that generates synchronization signals based on the relative intensity changes of light signals from both the wavelength conversion and filter modules, allowing for automatic synchronization without the need for additional timing marks, thereby reducing assembly errors and improving color performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If manual assembly with timing marks is used for synchronization control, then the device complexity is reduced, but the manufacturing precision and reliability deteriorate due to assembly errors
Solution Approach 1:
The patent replaces the mechanical timing mark system with an optical detection system. Sensors detect the excitation beam and converted light beams to generate synchronization signals, eliminating the need for manual assembly of timing marks and mechanical synchronization mechanisms. This substitution of mechanical systems with optical and electronic systems resolves the contradiction by improving manufacturing precision while maintaining device complexity at an acceptable level.
Solution Approach 2:
The system uses its own light beams (excitation beam and converted light beams) as synchronization references. The sensors detect these inherent beams to generate synchronization signals, allowing the system to self-synchronize without external timing marks or manual intervention. This self-service approach eliminates assembly errors while avoiding complex external synchronization mechanisms.
2Device complexity
If timing marks are attached manually to motors, then the device complexity is reduced, but the reliability deteriorates due to assembly errors affecting synchronization
Solution Approach 1:
The patent replaces the mechanical timing mark attachment system with an optical detection system using sensors. The sensors detect the excitation beam and converted light beams to generate reliable synchronization signals, eliminating the reliability issues associated with manual timing mark assembly while avoiding complex mechanical synchronization mechanisms.
Solution Approach 2:
The system implements feedback by using sensors to continuously detect the excitation beam and converted light beams, generating synchronization signals based on the actual light beam states. This feedback mechanism ensures reliable synchronization by continuously monitoring and adjusting based on real-time conditions, eliminating the one-time assembly error problem of timing marks.
3Measurement precision
If chromaticity sensor is disposed on projection screen, then the color performance measurement is achieved, but the ease of operation deteriorates due to manual adjustment requirements
Solution Approach 1:
The patent performs preliminary action by using sensors to detect the excitation beam and converted light beams before the light reaches the projection screen. The control module generates synchronization signals based on these preliminary detections, automatically adjusting the wavelength conversion module and filter module to achieve optimal color performance before the light is modulated and projected. This eliminates the need for manual adjustment after projection.
Solution Approach 2:
The system implements automated feedback control by using sensors to detect light beam characteristics and the control module to generate synchronization signals that automatically adjust the wavelength conversion module and filter module. This closed-loop feedback system eliminates manual adjustment operations while maintaining precise color performance measurement and control.
4Manufacturing precision
If synchronization control is implemented with multiple modules, then the color performance is improved, but the device complexity increases due to coordination requirements
Solution Approach 1:
The patent replaces complex mechanical coordination mechanisms with an optical-based synchronization system. Sensors detect the excitation beam and converted light beams to generate synchronization signals that coordinate the wavelength conversion module and filter module. This optical-electronic coordination system achieves precise color performance while reducing mechanical complexity compared to traditional synchronized mechanical systems.
Solution Approach 2:
The control module serves multiple functions: it receives synchronization signals from sensors, processes these signals, generates control signals for the wavelength conversion module and filter module, and coordinates their operation. This multi-functionality reduces the need for separate coordination mechanisms for each module, simplifying the overall system while maintaining precise color performance control.
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 enables precise synchronization and adjustment of the illumination beam, ensuring better color performance in the final output image beam by eliminating the need for manual timing mark assembly and reducing the risk of synchronization errors.
Implementation Method 1
The first sensor is located beside and faces the transmission path of the excitation beam, and is configured to receive a part of the excitation beam and a part of the at least one converted beam that are scattered by the wavelength conversion module, so as to generate a first photoelectric signal
Implementation Method 2
The second sensor is located beside and faces a transmission path of the first set of color light and the second set of color light, and is configured to receive a part of the first set of color light and a part of the second set of color light that are scattered by the filter module, so as to generate a second photoelectric signal
Implementation Method 3
The wavelength conversion module is located on a transmission path of the excitation beam, and has at least one wavelength conversion area configured to convert the excitation beam into at least one converted beam
Implementation Method 4
The filter module is located on the transmission path of the excitation beam and the at least one converted beam, and has at least one filter area configured to cause the at least one converted beam to form a first set of color light
Data Source
AI summary
The disclosure relates to an illumination system, a projection device and an illumination control method. The illumination system includes a first sensor, a second sensor and a control module. The first sensor receives a part of an excitation beam and a part of at least one converted beam scattered by a wavelength conversion module, so as to generate a first photoelectric signal. The second sensor receives a part of a first set of color light and a part of a second set of color light scattered by a filter module, so as to generate a second photoelectric signal. The control module generates a synchronization signal based on relative intensity changes of the first and second photoelectric signals. The synchronization signal is to synchronize the wavelength conversion module with the filter module, and the first set of color light and the second set of color light sequentially form an illumination beam.