Modular LED Backlight Power Assemblies with Sealed Sub-Channels
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Solution Overview
Problem
Large LCD displays face challenges with increased power requirements and heat generation in backlights, leading to complex electrical connections and potential contamination from ambient air, especially in outdoor environments with high temperatures.
Innovation Solution
Grouping power modules and inductors into power assemblies that are spatially close to the backlight sections, with electrical connections passing through a mounting panel and optionally a sealed sub-channel to prevent contamination, and using a cooling channel with ribs to manage heat and contaminants.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If power modules and inductors are grouped separately with connections routed around the edge of the backlight, then electrical connections can be established, but the amount of electrical connectors and wiring increases substantially
Solution Approach 1:
The patent combines power modules and inductors into integrated power assemblies that are positioned adjacent to the LED panels. This merging of components reduces the number of separate electrical connectors and wiring routes required, as the power assembly serves multiple functions (power conversion, filtering, and driving) in a single integrated unit positioned close to the load.
Solution Approach 2:
The backlight system is divided into modular sections with each section having its own integrated power assembly. This segmentation allows for distributed power management where each module is independently powered and controlled, reducing the overall wiring complexity compared to a centralized power distribution system.
2Device complexity
If electrical connections pass through the mounting panel and backlight, then wiring complexity is reduced, but contamination from cooling air may affect the components
Solution Approach 1:
The patent introduces a sealed channel as an intermediary structure that allows electrical connections to pass through the mounting panel and backlight while preventing contamination from the cooling air. This sealed channel acts as a protective barrier that maintains the integrity of the electrical connections and internal components while still allowing the cooling air flow path to be established.
3Area of stationary object
If the backlight size increases, then display area increases, but power requirements and heat generation increase
Solution Approach 1:
The patent divides the large backlight into multiple smaller LED panels, each powered by its own integrated power assembly. This segmentation allows for distributed power management that reduces the overall power requirement for any single section and improves heat dissipation by localizing heat generation to smaller, more manageable units.
Data Source
AI summary
A system for powering an LED backlight where power assemblies have electrical communications ran through pass through apertures in a mounting plate and LED backlight panel. A channel may be defined between the mounting plate and the LED backlight panel (or optional thermal plate attached to the rear portion of the LED backlight panel). Sub-channels can be created within the channel which are defined by ribs which connect between the mounting plate and the LED backlight panel (or optional thermal plate attached to the rear portion of the LED backlight panel). Cooling air can be prevented from entering one or more specific sub-channels so that electrical connections can pass through the mounting plate, LED backlight panel, and sub-channel without the risk of cooling air contaminates entering one of the pass through apertures.