LED Current Control Module for Selective Feedback
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Solution Overview
Problem
Existing LED driving systems face limitations in the number of connectable LED channels due to performance constraints of DC/DC converters, leading to inefficiencies in connecting LEDs and restricting the arrangement of backlights in liquid crystal displays.
Innovation Solution
An LED current controlling module that divides LED channels into groups based on operation modes, detects the minimum voltage of each group, and selectively feeds back this voltage to DC/DC converters to maintain constant current, allowing for flexible operation modes and increased connectivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single DC/DC converter is used to drive multiple LED channels, then the device complexity is reduced, but the number of LED channels that can be driven is limited and connection efficiency deteriorates
Solution Approach 1:
The patent divides LED channels into multiple groups, with each group controlled by a dedicated DC/DC converter. This segmentation allows multiple converters to operate in parallel, significantly increasing the total number of LED channels that can be driven while maintaining manageable complexity through modular architecture
Solution Approach 2:
The LED driving module is designed with multi-functional capability to support both single-converter and multi-converter operation modes. The same module structure can adapt to different configurations based on the number of LED channels required, providing universal applicability across various display sizes and requirements
2Measurement precision
If LED channels are divided into multiple groups with selective feedback, then the control precision is improved, but the device complexity increases
Solution Approach 1:
The feedback control is segmented to operate independently within each LED channel group. Each group has its own feedback controller that detects minimum voltage and provides selective feedback to the corresponding DC/DC converter, improving control precision without requiring a monolithic complex control system
Solution Approach 2:
The system performs preliminary voltage detection and comparison within each group before feedback control. The minimum voltage selector identifies the critical voltage point in advance, allowing the feedback controller to optimize converter operation proactively rather than reactively
3Productivity
If the number of DC/DC converters is increased to drive more LED channels, then the number of LED channels is improved, but the device complexity and cost increase
Solution Approach 1:
The system segments LED channels into groups that can be independently driven by individual DC/DC converters. This allows scalable configuration where converters are added only when needed, rather than requiring a single high-power converter or driving all channels through one converter
Solution Approach 2:
The system dynamically adapts its operation mode based on the number of LED channels and converter availability. It can switch between single-converter mode for smaller displays and multi-converter parallel mode for larger displays, optimizing the balance between channel capacity and system complexity
Data Source
AI summary
The present invention provides a module for controlling an LED current for selective feedback, an apparatus and a method for driving LEDs using the same. The module for controlling the LED current, which is connected to a plurality of LED channels receiving driving powers supplied from at least one DC/DC converter and controls currents of the LED channels through a constant current, the LED current controlling module includes: an operation mode selector for selecting an operation mode according to an inputted enable signal level; a channel divider for dividing a plurality of LED channels into at least one group according to the selected operation mode; and a minimum voltage selector for selecting an LED channel with a minimum voltage, obtained by comparing voltages detected from each of lower ends of the LED channels included in each of one or more divided groups.