Backlight Unit Frame Circuit Board Inverter Integration
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Solution Overview
Problem
Existing backlight units for large-size LCDs face issues with current leakage, high material costs due to manual soldering, and inefficiencies in driving fluorescent lamps, leading to non-uniform light emission and increased manufacturing time and costs.
Innovation Solution
A backlight unit design featuring a frame with a circuit board and inverter connected through a hole, using auto-attached lamp sockets on a printed circuit board (PCB) to reduce wire count and inverter number, and employing parallel drivers for uniform power distribution to fluorescent lamps, minimizing manual soldering and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If manual soldering is used to connect wires to fluorescent lamps, then connection reliability is improved, but manufacturing cost and time increase
Solution Approach 1:
The patent replaces manual soldering (mechanical/electrical connection process) with an auto-attached lamp socket system that uses mechanical insertion and electrical contact through the PCB. The lamp socket is automatically attached to the PCB, and fluorescent lamps are inserted into the sockets, eliminating the need for manual soldering while maintaining reliable electrical connections.
2Adaptability or versatility
If multiple wires and inverters are used to drive fluorescent lamps, then power distribution flexibility is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple separate components (wires and inverters) into a single integrated PCB structure. The PCB serves as both the structural support and the electrical distribution network, with circuit traces replacing separate wires and a centralized inverter circuit replacing multiple individual inverters. This integration maintains power distribution flexibility while significantly reducing structural complexity.
Solution Approach 2:
The PCB performs multiple functions simultaneously: it provides structural support for the fluorescent lamps, serves as the electrical distribution network through its circuit traces, houses the inverter circuit, and provides mounting points for lamp sockets. This multi-functionality eliminates the need for separate wires and multiple inverters, reducing overall system complexity.
3Manufacturing precision
If more inverters are used to drive fluorescent lamps, then power control precision is improved, but manufacturing cost increases
Solution Approach 1:
The patent combines multiple inverter functions into a single inverter circuit on the PCB that can control multiple fluorescent lamps through the printed circuit traces. This centralized inverter design maintains precise power control capability while reducing the total number of inverter components, thereby lowering manufacturing costs.
4Adaptability or versatility
If numerous wires are used to connect lamps to inverter, then connection flexibility is improved, but electromagnetic interference increases
Solution Approach 1:
The patent replaces numerous separate wire connections with integrated PCB trace connections. The electrical signals travel through the controlled impedance traces on the PCB rather than through multiple separate wires, significantly reducing electromagnetic interference while maintaining connection flexibility through the circuit board's routing capabilities.
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 design reduces current leakage, lowers manufacturing costs and time, and ensures uniform light emission by simplifying connections and reducing the number of inverters, resulting in a more compact and efficient backlight unit.
Implementation Method 1
A backlight unit for a display device includes a frame; a circuit board extending from an end of and on a first surface of the frame; lamps over the frame; and an inverter on a second surface of the frame connected to an end of each of the lamps via a first hole through the frame
Data Source
AI summary
A backlight unit for a display device includes a frame; a circuit board extending from an end of and on a first surface of the frame; lamps over the frame; and an inverter on a second surface of the frame connected to an end of each of the lamps via a first hole through the frame.