LED Backlight Driver Merging for Cost Reduction
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Solution Overview
Problem
Conventional LED backlight units require a large number of LED drivers, increasing manufacturing costs and control complexity due to the need for separate drivers for each divided area, resulting in a larger drive board and higher costs.
Innovation Solution
A single LED driver is used to power multiple LEDs across multiple divided areas, with a sensor and controller to adjust drive power based on light emission, reducing the number of drivers and simplifying control by using PWM for power modulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If separate LED drivers are used for each divided area, then each area can be independently controlled, but the number of drivers and electronic parts increases, enlarging the drive board area and increasing manufacturing cost
Solution Approach 1:
Multiple separate LED drivers are merged into a single integrated LED driver that can control LEDs across multiple divided areas. The drive board is designed with a unified circuit architecture that consolidates what would have been separate driver units, reducing the total number of electronic parts while maintaining the capability to independently control different divided areas through signal routing and switching mechanisms within the single driver.
Solution Approach 2:
A single LED driver is designed to perform multiple functions by controlling LEDs in different divided areas. The driver incorporates multi-functional circuitry that can selectively drive LEDs across various regions, replacing the need for dedicated single-function drivers for each area. This universal driver maintains independent control capability while reducing overall system complexity.
2Measurement precision
If separate LED drivers are used for each divided area, then control precision for each area is maintained, but the drive board area and manufacturing cost increase
Solution Approach 1:
The control architecture transitions from a distributed spatial arrangement of separate drivers to a centralized hierarchical control structure. The single LED driver uses signal routing and switching mechanisms to achieve area-specific control precision without requiring physical separation of driver units. This dimensional reorganization allows precise control of individual divided areas while consolidating hardware into a compact drive board.
3Adaptability or versatility
If multiple LED drivers are used, then each driver can be optimized for its specific area, but the control system becomes more complicated
Solution Approach 1:
The control system is segmented into modular functional blocks within the single LED driver, including separate control channels or switching matrices for different divided areas. This internal segmentation allows area-specific optimization and independent control while maintaining a unified hardware platform, reducing the complexity associated with coordinating multiple separate drivers.
Data Source
AI summary
A light emitting diode backlight (LED) unit includes: a substrate having a plurality of divided areas; a plurality of LEDs disposed on the substrate; and an LED driver supplying a drive power to the plurality of LEDs disposed in at least two of the plurality of divided areas, wherein at least a part of the plurality of LEDs disposed in one of the plurality of divided areas is electrically connected to each other.