Projection Apparatus Power Supply Synchronization Control
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Solution Overview
Problem
In laser projection systems, the power supply does not adequately manage the transition between standby and active modes, leading to audio and image desynchronization due to the display component not being turned on before the audio playback component starts playing audio.
Innovation Solution
A projection apparatus with a main control circuit that sends a shutdown command to the display driving circuit before powering off, ensuring the display component is turned off before stopping power to the display driving circuit, and sends a power-on command after confirming the display component is on, synchronizing audio playback with image display.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the power supply stops supplying power to the display driving circuit immediately upon receiving a power-off command, then the power-off response speed is improved, but the display component may not be fully turned off before audio playback starts, causing audio-image desynchronization
Solution Approach 1:
The main control circuit sends a shutdown command to the display driving circuit before stopping power supply. This preliminary action ensures the display component is turned off before the power supply is completely disconnected, preventing audio-image desynchronization while maintaining fast power-off response.
2Productivity
If the power supply maintains power to the display driving circuit during standby mode, then the display component can be quickly turned on when needed, but power is continuously consumed and the display may not be properly initialized before audio playback
Solution Approach 1:
Before stopping power supply during standby, the main control circuit sends a shutdown command to the display driving circuit in advance. This ensures the display component is properly initialized and turned off before power is cut, enabling quick and reliable turn-on when needed while reducing standby power consumption.
3Device complexity
If the main control circuit sends power-off command without coordinating with the display driving circuit, then the control simplicity is improved, but the display component state becomes uncertain causing audio-image desynchronization
Solution Approach 1:
The power-off process is segmented into two distinct control actions: first sending a shutdown command to the display driving circuit to control the display component, then stopping power supply to the display driving circuit. This segmentation ensures reliable display component state control while adding minimal complexity to the control circuit.
Data Source
AI summary
A projection apparatus includes a main control circuit, a power supply, a display driving circuit, an audio playback component and a display component. The main control circuit is configured to send a first image signal to the display driving circuit. The display driving circuit is configured to receive the first image signal, and control the display component to display an image corresponding to the first image signal. The main control circuit is further configured to send a second image signal and an audio signal corresponding to the second image signal to the display driving circuit and the audio playback component, respectively. The display driving circuit is configured to receive the second image signal and control the display component to display an image corresponding to the second image signal, and the audio playback component is configured to receive the audio signal and play audio corresponding to the audio signal.