Projector Lamp Refreshing with Aperture Compensation
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Solution Overview
Problem
Existing projector technologies face issues with luminance changes during the lamp refreshing process, which degrades image quality and requires users to anticipate and manage these changes, while also failing to maintain consistent image brightness.
Innovation Solution
A projector system that includes a lamp refreshing controller to adjust lighting power and an aperture data generator to control the optical diaphragm, ensuring constant light passage by synchronizing aperture adjustments with lighting power changes, thereby minimizing luminance variations during the lamp refreshing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lighting power of the lamp is increased to rated power to recover lamp characteristics, then the service life of the lamp is extended and flickering is reduced, but the luminance of projected images changes
Solution Approach 1:
The patent introduces an optical diaphragm as an intermediary element in the light path between the lamp and the projection system. This diaphragm dynamically adjusts the amount of light reaching the projection optics, serving as a mediator that decouples the lamp power changes from the projected image luminance. When lamp power is increased for refreshing, the diaphragm restricts light passage to maintain constant image luminance, thus resolving the contradiction between lamp reliability improvement and image luminance stability.
Solution Approach 2:
The patent dynamically changes the aperture parameter of the optical diaphragm in response to lamp power changes. By adjusting the aperture size (opening degree) of the diaphragm, the system compensates for luminance variations caused by lamp power adjustments. When lamp power increases during refreshing, the aperture is reduced to maintain constant light output to the projection system, thereby maintaining image luminance while allowing lamp characteristics to be recovered.
2Use of energy by moving object
If the lighting power of the lamp is reduced to lower power consumption, then the power consumption of the projector is reduced, but the lamp characteristics are degraded
Solution Approach 1:
The patent implements periodic lamp refreshing cycles where the lamp operates at reduced power for extended periods (normal operation) and periodically transitions to rated power for short durations (refreshing phase). This periodic alternation allows the system to benefit from low power consumption during normal operation while periodically restoring lamp characteristics through high-power refreshing, thus resolving the contradiction between energy efficiency and lamp reliability.
Solution Approach 2:
The system dynamically changes the lighting power parameter of the lamp between two states: reduced power for energy saving and rated power for refreshing. The control mechanism monitors lamp usage time and characteristics, switching the power parameter appropriately. Combined with optical diaphragm aperture adjustment, this allows the system to maintain acceptable image luminance while enabling both energy-saving operation and periodic lamp characteristic recovery.
3Illumination intensity
If the optical diaphragm aperture is adjusted to maintain constant light passage during lamp refreshing, then the luminance of projected images remains constant, but the control system complexity increases
Solution Approach 1:
The patent merges the lamp power control function and the optical diaphragm aperture control function into a unified control system. The same controller that manages lamp refreshing timing and power levels also manages the aperture adjustments. This integration allows the system to coordinate lamp power changes and diaphragm aperture changes together, achieving image luminance compensation without requiring separate independent control systems, thus limiting the increase in overall system complexity.
Solution Approach 2:
The system employs feedback control where the controller monitors lamp operation status and power levels, and automatically adjusts the optical diaphragm aperture in response. When the lamp transitions to rated power for refreshing, the controller receives feedback about this power change and automatically reduces the aperture to compensate for the resulting luminance increase. This automated feedback mechanism maintains image luminance consistency without requiring complex manual intervention or overly sophisticated control algorithms.
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 effectively maintains consistent image luminance by dynamically adjusting the optical diaphragm's aperture in response to lighting power changes, reducing the impact of lamp refreshing on projected image brightness and ensuring stable image quality.
Implementation Method 1
an aperture data generator which controls the aperture of the optical diaphragm depending on a change in the lighting power to keep constant the amount of light passing through the optical diaphragm
Implementation Method 2
High-pressure discharge lamps (hereinafter referred to as 'lamp') have been used as a general light source for projectors
Implementation Method 3
an electrode substance that is evaporated from electrodes of the lamp by the electric discharge between the electrodes
Implementation Method 4
a halogen cycle is caused wherein an electrode substance that is evaporated from electrodes of the lamp by the electric discharge between the electrodes is deposited on the electrodes again by the action of the halogen gas
Implementation Method 5
an electrode substance that is evaporated from electrodes of the lamp
Implementation Method 6
is deposited on the electrodes again by the action of the halogen gas
Data Source
AI summary
In order to minimize a change in the luminance of a projected image caused by a lamp refreshing process, projector 10 according to the present invention includes lamp refreshing controller 13 which, upon detecting that the lighting power of lamp 15 is lower than rated power thereof for a given period of time, increases the lighting power of lamp 15 to the rated power and, after elapse of a predetermined period of time, reduces the lighting power to an original level thereof, and aperture data generator 16 which controls the aperture of optical diaphragm 18 depending on a change in the lighting power to keep constant the amount of light passing through optical diaphragm 18.