LED Driver Voltage Latching for Accurate Backlight Power Feedback
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Solution Overview
Problem
Existing light-emitting element driving devices struggle with improper adjustment of power supply voltage due to insufficient detection and latching of terminal voltage insufficiencies in sub-devices, leading to inefficiencies in power management.
Innovation Solution
The implementation of a monitor section comprising comparators and latch processing sections, along with a delay circuit, allows for continuous monitoring and latching of terminal voltage detection signals across multiple channels, enabling precise adjustment of power supply voltage based on real-time feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If multiple light-emitting element driving devices are connected in parallel to drive multiple channels, then the driving capability and channel coverage are improved, but the power supply voltage adjustment accuracy deteriorates due to insufficient detection and latching of terminal voltage insufficiencies in sub-devices
Solution Approach 1:
The system divides the monitoring function into independent segments: each light-emitting element driving device has its own monitor section that independently detects terminal voltages of its connected channels. This segmentation allows each device to autonomously monitor its own voltage status without interfering with other devices, thereby maintaining measurement precision while enabling parallel operation of multiple devices to drive more channels.
Solution Approach 2:
The patent implements a feedback mechanism where the monitor section continuously detects terminal voltages and provides this information to the control signal generation section. When terminal voltage insufficiency is detected, the system generates appropriate control signals to adjust the power supply voltage. This closed-loop feedback ensures accurate voltage adjustment even when multiple devices operate in parallel, resolving the contradiction between expanded driving capability and maintained adjustment accuracy.
2Loss of time
If terminal voltage detection is performed continuously across all channels, then the power supply voltage adjustment timeliness is improved, but the device complexity increases due to additional monitoring and control circuitry
Solution Approach 1:
The monitor section is designed to detect terminal voltage insufficiency proactively before it affects light-emitting element operation. By continuously monitoring terminal voltages and latching detection results, the system prepares adjustment signals in advance, ensuring timely voltage correction without adding excessive complexity. The latch processing section stores detection results for use in the next control period, reducing the need for complex real-time processing.
Solution Approach 2:
The patent combines multiple functions into integrated sections: the monitor section integrates voltage detection, latching, and signal generation capabilities. The control signal generation section merges the processing of detection results with the generation of adjustment signals. This functional integration achieves continuous monitoring and timely response while minimizing device complexity through consolidated circuit design.
Data Source
AI summary
A light-emitting element driving device includes a monitoring section that monitors a voltage of a connection terminal with a driving current in an on state and holds a monitoring result; an output section that outputs a terminal voltage detection signal indicating whether a voltage of the connection terminal of at least one channel is lower than a reference voltage based on the held monitoring result; an output terminal that outputs the terminal voltage detection signal to an outside; an input terminal; and a control signal generation section that generates a control signal used for feedback control of a power supply circuit that generates a power supply voltage based on a signal input to the input terminal and the held monitoring result, wherein the on state of the driving current is controlled during one period of a synchronization signal, and the control signal generation section updates the control signal when the next period of the synchronization signal starts.