LED Package Dummy Leads Reduce PCB Width
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Solution Overview
Problem
Conventional light source modules for LCD devices have a wide printed circuit board due to the arrangement of LED packages, which increases production costs and limits slim device designs.
Innovation Solution
The use of additional wire lines within the LED packages allows for reduced PCB width by forming dummy leads that act as additional lines, enabling a more compact arrangement of LED packages on the PCB.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If conventional LED packages with standard lead frame configurations are used, then the LED packages can be easily manufactured and mounted, but the printed circuit board width increases, leading to higher production costs and larger device size
Solution Approach 1:
The lead frame is segmented into multiple functional regions: a first lead for electrical connection, a second lead for electrical connection, and a dummy lead that is electrically isolated. This segmentation allows the dummy lead to be used purely for spatial arrangement and reducing PCB width without affecting electrical functionality.
Solution Approach 2:
The dummy lead acts as an intermediary element that occupies space on the PCB to reduce the overall width required for the LED package arrangement. It serves as a placeholder that enables more compact layout without carrying electrical current.
2Power
If more LED packages are arranged on the printed circuit board, then the light output increases, but the number of lines and connection complexity on the PCB increases
Solution Approach 1:
The electrical connection function is extracted from the dummy lead, allowing it to be used purely for spatial arrangement. By separating the electrical connection role (handled by first and second leads) from the spatial occupation role (handled by dummy lead), the design reduces the number of electrical lines needed on the PCB.
Solution Approach 2:
The dummy lead provides multiple functions: it occupies space to reduce PCB width, maintains mechanical structure integrity, and enables compact arrangement of multiple LED packages without requiring additional electrical connection lines.
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 configuration reduces the width of the printed circuit board and lowers production costs by minimizing the number and length of lines on the PCB, facilitating more compact and cost-effective light source modules.
Implementation Method 1
The LED has characteristics of high light-emitting efficiency, long lifespan and low power consumption. Due to such characteristics, the LED is used as a light source of the light source module of the backlight unit.
Implementation Method 2
The LED chip 4 is connected to the anode lead 6a and the cathode lead 6b of the lead frame 6, by a wire 5 formed of gold (Au), silver (Ag), etc.
Data Source
Figure 1A~1B
Figure 2~3
Figure 4~5
AI summary
Disclosed are a light emitting diode package, a light source module and a backlight unit including the same. A plurality of light emitting diode packages are arranged on a printed circuit board without interference therebetween, by forming lines therein.