Light Source Synchronization via Feedback Control for Projection Displays
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Solution Overview
Problem
In projection apparatuses, the synchronization of auxiliary and primary light sources is challenging, leading to uneven brightness and reduced image display quality due to mismatched light-emitting times and intensities.
Innovation Solution
A light source generating device comprising a primary light source, an auxiliary light source, a control device, a driver, and a current command generator, where the control device generates driving signals and current commands to synchronize the operation of the auxiliary light source with the primary light source, ensuring the brightness and timing of the auxiliary light beam correspond to those of the primary light beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an auxiliary light source is added to enhance brightness, then the brightness of the light beam is improved, but the synchronization between the auxiliary light source and the primary light source becomes difficult to maintain
Solution Approach 1:
The control device receives a first indication signal corresponding to the driving current of the primary light source, generates a current command based on this signal, and uses it to control the auxiliary light source. This feedback mechanism ensures the auxiliary light source's brightness and timing continuously match the primary light source's output, resolving the synchronization issue while maintaining enhanced brightness.
Solution Approach 2:
The system copies the driving current characteristics from the primary light source to control the auxiliary light source. By using the first indication signal of the primary light source's driving current as the basis for generating the current command, the auxiliary light source replicates the primary light source's brightness and timing profile, ensuring synchronization while providing brightness enhancement.
2Illumination intensity
If the auxiliary light source operates independently, then it can provide additional brightness, but the light-emitting brightness and time do not match the primary light source, affecting image display quality
Solution Approach 1:
The control device uses feedback from the first indication signal (corresponding to the primary light source's driving current) to continuously adjust the auxiliary light source's operation. This ensures the auxiliary light's brightness and timing precisely match the primary light source, maintaining high image display quality while providing brightness enhancement.
Solution Approach 2:
The system dynamically changes the operating parameters (current command) of the auxiliary light source based on the first indication signal from the primary light source. By adjusting the auxiliary light source's brightness and timing parameters in real-time to match the primary light source, the system maintains image quality while enhancing overall brightness.
Data Source
AI summary
A light source generating device, a projection apparatus and a light source generation method are provided. The light source generating device includes a first light source, an auxiliary light source, a control device, a driver and a current command generator. The first light source generates a first light beam. The auxiliary light source generates an auxiliary light beam corresponding to the first light beam. The control device generates a first driving signal to drive the first light source. The driver generates an auxiliary driving signal to drive the auxiliary light source according to the gate control signal and a current command. The current command generator receives an indication signal, and generates the current command according to the indication signal, wherein the indication signal corresponds to a driving current of the first light source. The invention has an effect of enhancing brightness/chrominance.