LED Backlight Unit with Integrated Power Socket
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Solution Overview
Problem
Existing backlight units for liquid crystal display (LCD) devices using cold cathode fluorescent lamps (CCFLs) face issues with decreased brightness and non-uniform brightness as screen size increases, and the transition to LED-based units is complex due to the need for additional components like connectors and housings, increasing manufacturing time and costs.
Innovation Solution
A simplified backlight unit design for LCDs using LEDs, featuring a chassis with a printed circuit board (PCB) and a power socket integrated into the chassis, eliminating the need for separate connectors and housings by using conductive pads and power supply terminals for direct electrical connection, thereby reducing manufacturing complexity and costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If CCFL is used as light source, then backlight unit can be manufactured with existing structure, but brightness decreases and uniformity deteriorates as screen size increases
Solution Approach 1:
The patent changes the light source parameter from CCFL to LED, which fundamentally alters the illumination characteristics. LEDs provide higher brightness and better uniformity across larger screen sizes compared to CCFL, directly addressing the brightness uniformity deterioration issue while maintaining manageable structural complexity through the edge-lighting configuration
2Reliability
If LED backlight unit is designed with separate connector and housing, then electrical connection can be secured, but manufacturing time and cost increase
Solution Approach 1:
The patent merges the connector and housing into a single integrated component. The connector is formed as an integral part of the housing structure, eliminating the need for separate connector assembly. This integration maintains reliable electrical connection while significantly reducing manufacturing steps and time, directly addressing the productivity issue
Solution Approach 2:
The integrated connector-housing structure performs multiple functions simultaneously: it provides mechanical support, electrical connection, and structural integrity. This multi-functionality reduces the total component count and assembly complexity, addressing both the reliability and productivity concerns
3Manufacturing precision
If multiple components (connector, housing, PCB) are assembled sequentially, then proper assembly can be achieved, but manufacturing process becomes complex and time-consuming
Solution Approach 1:
The patent combines multiple components (connector, housing, and PCB mounting structure) into a single integrated assembly. This eliminates the need for sequential assembly of multiple separate parts, reducing assembly process complexity while maintaining precision through the unified structure that inherently ensures proper positioning and connection
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 allows for a more affordable and straightforward manufacturing process of LED-based backlight units for LCDs, ensuring consistent brightness and reduced production time by eliminating the need for additional components, thus addressing the challenges of brightness uniformity and manufacturing complexity.
Implementation Method 1
a backlight unit using light emitting diodes (LEDs) as a light source has been developed recently
Implementation Method 2
a plurality of light emitting diodes (LEDs) aligned on one side or on both sides of a chassis
Data Source
AI summary
Provided is a backlight unit for a liquid crystal display device. The backlight unit includes: a chassis; a printed circuit board connected to a side of the chassis, the printed circuit board including a plurality of light emitting diodes, and a pair of conductive pads through which power is supplied to the light emitting diodes, wherein the pair of conductive pads are disposed on an end of the printed circuit board; and a power socket into which the pair of the conductive pads are inserted.