Distributed LED Backlight Driver Architecture
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Large LCD monitors require multiple LED strings with varying voltage drops due to aging and temperature changes, necessitating multiple power sources for consistent backlighting, which is costly and leads to excess power dissipation when using a single power source for multiple strings.
Innovation Solution
A distributed architecture with multiple driving circuitries connected in parallel to a single controllable power source, where each circuitry monitors and controls the voltage drop of associated LED luminaires, adjusting the power source output to ensure equal current distribution and minimize power dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If a single power source is used for multiple LED strings, then the number of power sources is reduced and cost is lowered, but excess power dissipation occurs because the power source must be set to supply sufficient voltage for all LED strings over their operational life
Solution Approach 1:
The system segments the control of LED strings by introducing multiple driving circuitries (first, second, and third driving circuitries) that independently monitor and control different groups of LED strings. Each driving circuitry monitors the voltage drop across its associated LED strings and selectively controls the controllable power source, allowing the system to use a single power source without excessive power dissipation by actively managing the voltage distribution to each LED string group.
2Loss of energy
If separate power sources are supplied for each LED string, then excess power dissipation is minimized, but the cost increases due to the requirement for a large plurality of power sources
Solution Approach 1:
The invention merges multiple driving circuitries into a coordinated system that controls a single controllable power source. The first, second, and third driving circuitries work together to monitor voltage drops across different LED string groups and collectively control the power source output, achieving energy efficiency comparable to separate power sources while reducing the total number of power sources required.
3Quantity of substance
If a single controllable power source is used with multiple driving circuitries, then the number of power sources is reduced, but the device complexity increases due to the distributed architecture with multiple driving circuitries
Solution Approach 1:
Each driving circuitry (first, second, and third) is designed with multi-functionality, serving both as a monitor for its associated LED strings and as a controller for the controllable power source. This universal design allows the driving circuitries to perform multiple functions within the distributed architecture, managing both local LED string monitoring and global power source control, thereby reducing overall system complexity despite the distributed nature of the architecture.
Data Source
AI summary
A backlight system for light emitting diodes (LEDs), the backlight system constituted of: a controllable power source; a plurality of LED based luminaires arranged to receive power in parallel from the controllable power source; a plurality of driving circuitries, each of the plurality of driving circuitries arranged to control the light output of at least two of the plurality of LED based luminaires and further arranged to output information regarding the voltage drop of at least one of the at least two LED based luminaires controlled thereby, wherein the controllable power source is arranged to output a voltage whose value is responsive to the output information.