LED Display Driver IC Topology for Low-Power Line Scanning
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Solution Overview
Problem
Existing LED display devices face challenges in reducing power consumption and leakage current due to the large number of driver ICs required, exacerbated by stringent power consumption regulations.
Innovation Solution
The implementation of a master driver IC and slave driver IC configuration, where the master IC drives scan and channel lines in specific directions, and the slave IC drives complementary lines, with a power reduction determination unit to switch between low power and normal modes, utilizing switches and transistors to manage current flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a large number of driver ICs are used to drive mini-LED or micro-LED elements in display devices, then the display device can be implemented with modularized LED elements and large-scaled display can be achieved, but the power consumption of each driver IC becomes significant and total power consumption increases
Solution Approach 1:
The patent combines multiple driver IC functions into a single integrated driver IC that can control multiple LED strings. The integrated driver IC includes multiple current source units, each capable of driving multiple LED strings simultaneously, thereby reducing the total number of driver ICs required and lowering overall power consumption while maintaining display scalability
Solution Approach 2:
The driver IC is designed with multi-functional current source units that can dynamically allocate current to different LED strings based on display requirements. Each current source unit can serve multiple LED strings, and the driver IC can adapt to different display configurations, achieving both versatility and energy efficiency
2Ease of manufacture
If multiple driver ICs are disposed to drive a plurality of LED modules, then the display device can be implemented, but the number of driver ICs increases and power consumption regulation compliance becomes difficult
Solution Approach 1:
The patent merges the functions of multiple driver ICs into a single integrated driver IC that controls multiple LED modules. The integrated design reduces the total component count, simplifies manufacturing, and lowers power consumption while maintaining the ability to drive large-scaled displays with multiple LED modules
3Reliability
If driver ICs operate in normal mode to drive all scan and channel lines, then complete display coverage is achieved, but power consumption and leakage current increase
Solution Approach 1:
The driver IC implements dynamic operation modes that can switch between normal mode and low power mode. The low power mode dynamically activates only the necessary current source units based on display requirements, reducing leakage current and power consumption while maintaining adequate display coverage through coordinated control of multiple LED strings
Solution Approach 2:
The driver IC uses periodic scanning of LED strings with duty cycle control. Not all LED strings are activated simultaneously; instead, they are scanned in sequences with appropriate timing, allowing non-active current source units to remain in low-power state, thereby reducing overall leakage current while maintaining complete display coverage over time
Data Source
AI summary
An LED display driving device can include a master driver IC and a slave driver IC configured to drive LEDs arranged in each of display areas included in a display panel. The display area can include display units. The master driver IC drives a first scan line group corresponding to first and second display units adjacent to each other in a first direction among the display units and a first channel line group corresponding to first and third display units adjacent to each other in a second direction perpendicular to the first direction. Further, the slave driver IC drives a second scan line group corresponding to third and fourth display units adjacent to each other in the first direction among the display units and a second channel line group corresponding to second and fourth display units adjacent to each other in the second direction.