Modular LED Backlight Control Architecture for Display Systems
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Solution Overview
Problem
The existing system controller in LED-backlit displays carries a heavy workload and requires significant memory and processing power, making it inefficient and limiting its ability to perform tasks in parallel, which is undesirable for flexible and efficient display systems.
Innovation Solution
A modular control architecture is introduced, where the display is divided into sections, each controlled by a local controller (ASIC) that receives feedback signals to manage drive voltages and currents for the LED strings, sharing information with other local controllers and the system controller to synchronize operations and distribute workload.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If a single system controller manages all LED strings and backlight control functions, then centralized control is achieved, but the system controller workload and memory requirements increase significantly
Solution Approach 1:
The patent divides the LED backlight system into multiple independent zones, with each zone controlled by a dedicated controller. This segmentation distributes the control workload from a single system controller to multiple zone controllers, reducing the complexity and memory requirements of the central controller while maintaining coordinated operation across the entire display.
2Measurement precision
If the system controller manages all LED strings individually, then precise control is achieved, but processing power and memory requirements increase
Solution Approach 1:
By dividing the LED backlight into multiple zones with dedicated controllers, each controller manages a subset of LED strings independently. This maintains precise control within each zone while distributing the processing burden across multiple controllers, reducing the processing power required by any single controller.
Solution Approach 2:
Each zone controller independently manages its own LED strings without requiring continuous intervention from the system controller. The zone controllers autonomously handle current regulation and LED string control, reducing the processing workload on the system controller while maintaining precise control over each zone's LED strings.
3Ease of operation
If all LED strings are controlled by a single controller, then unified management is achieved, but the ability to perform parallel tasks is limited
Solution Approach 1:
The system is divided into multiple independent control zones, each with its own controller that can operate autonomously. This enables parallel task execution across different zones while the system controller maintains unified management through coordination and synchronization of the zone controllers.
Solution Approach 2:
The patent combines unified system-level management with distributed zone-level control. The system controller handles high-level coordination and synchronization, while zone controllers manage local LED string operations in parallel, achieving both unified management and improved productivity through parallel processing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach reduces the workload on the system controller, allowing for more efficient and flexible display management with reduced memory and processing requirements, enabling better performance and parallel task execution.
Implementation Method 1
the LEDs 202 are arranged in the parallel LED strings 204... The LED strings 204, 208 emit light when currents flow through them, thereby providing the backlight
Data Source
AI summary
The present invention discloses apparatus and techniques for modular backlighting control of a display. The display includes a number of strings of LEDs. The display is divided into several sections, and each section includes one or more strings of LEDs. A local controller is assigned to each section. The local controller receives feedback signals from the strings of LEDs in its sections and controls the drive voltages and drive currents of those strings. The local controllers communicate with each other and also with the main system controller.