Backlight Synchronization via Power Supply Injection
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Solution Overview
Problem
The challenge in realizing all wiring of slave devices in a backlight system on a single-layer aluminum substrate is that the synchronization port cannot be wired on the same layer due to obstruction by power supply and ground potential wiring, leading to increased costs when jumpers or double-layer wiring are used.
Innovation Solution
The synchronization signal is transmitted through the power supply port by injecting it into the power supply voltage, allowing each slave device to receive and separate the signal for synchronization operations, thereby eliminating the need for a dedicated synchronization port on the substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If all wiring of slave devices is realized on a single-layer aluminum substrate, then manufacturing cost is reduced, but the synchronization port cannot be wired due to obstruction by power supply and ground potential wiring
Solution Approach 1:
The patent merges the synchronization signal transmission function with the power supply port by injecting the synchronization signal into the power supply voltage line. This allows the power supply port to serve dual purposes: providing power and transmitting synchronization signals, thereby eliminating the need for separate synchronization wiring on the substrate.
Solution Approach 2:
The power supply port is designed to perform multiple functions: it not only provides power supply voltage to the slave devices but also serves as a transmission channel for synchronization signals. This multi-functionality reduces the number of required wiring layers and simplifies the overall substrate design.
2Reliability
If jumpers or double-layer wiring are used to resolve the synchronization port wiring issue, then the synchronization signal can be transmitted, but manufacturing cost increases significantly
Solution Approach 1:
The patent combines the synchronization signal transmission function with the existing power supply wiring, eliminating the need for additional jumpers or double-layer wiring structures. This approach maintains reliable synchronization signal transmission while avoiding the increased manufacturing costs associated with more complex wiring solutions.
3Reliability
If a dedicated synchronization port is added to each slave device, then synchronization signal transmission is enabled, but the device structure becomes more complex
Solution Approach 1:
The slave device's power supply port is designed to handle multiple functions: receiving power supply voltage and extracting synchronization signals from the injected signal. This eliminates the need for dedicated synchronization ports, reducing device structural complexity while maintaining reliable synchronization functionality.
Solution Approach 2:
The synchronization signal is extracted from the composite signal (power supply voltage with injected synchronization signal) at the slave device's power supply port. This extraction approach allows the device to obtain synchronization information without requiring a separate dedicated synchronization port.
Data Source
AI summary
A synchronization signal transmission method employed by a backlight system, the backlight system having a master device, a plurality of slave devices, and a plurality of LED strings, can include: injecting a synchronization signal into a power supply voltage, in order to generate a first signal; inputting the first signal to a power supply port of each slave device, in order to simultaneously transmit the synchronization signal to each slave device, where each slave device is configured to drive at least one LED string; and receiving the first signal from the power supply port of each slave device for synchronization operation.