Bar-Type LED PCBs for LCD Backlight Area Reduction
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Solution Overview
Problem
Existing LCD devices with LED backlight units face inefficiencies due to the large area consumption of plate-type printed circuit boards, leading to reduced usage efficiency and increased fabrication costs, as these boards are not mounted directly on the bottom cover and require additional components for wiring and connection.
Innovation Solution
The implementation of bar-type LED printed circuit boards that are spaced apart and connected via connection members or pronged configurations, allowing direct mounting on the bottom cover and reducing the need for additional connection PCBs, thereby minimizing area usage and fabrication costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If plate-type printed circuit boards are used for LED backlight units, then the structural stability and ease of wiring are improved, but the area consumption increases and usage efficiency decreases
Solution Approach 1:
The patent divides the backlight unit into multiple separate bar-type PCBs, each carrying only the LEDs it supports. This segmentation eliminates the need for a large plate-type PCB while maintaining wiring simplicity through localized connections. Each bar-type PCB is positioned directly beneath the LEDs it serves, reducing overall area consumption.
Solution Approach 2:
The patent transitions from a two-dimensional plate-type PCB layout to a three-dimensional arrangement where bar-type PCBs are positioned vertically beneath LED arrays. This dimensional change allows the circuit board to occupy less horizontal area while maintaining functional connectivity through direct mounting on the bottom cover.
2Reliability
If plate-type printed circuit boards are used for LED backlight units, then the wiring and connection stability are improved, but the fabrication cost increases
Solution Approach 1:
The patent segments the backlight unit into multiple independent bar-type PCB modules, each serving a specific LED array. This modular approach reduces material costs compared to a single large plate-type PCB, while maintaining connection stability through direct mounting on the bottom cover with localized wiring.
Solution Approach 2:
The patent extracts the unnecessary portions of the circuit board, using only the minimal bar-shaped PCB areas required to support each LED array. This eliminates waste of PCB material and reduces fabrication costs while maintaining adequate connection stability for the actual wiring needs.
3Area of stationary object
If bar-type printed circuit boards are used with spaced apart LEDs, then the area usage efficiency is improved, but the wiring complexity increases
Solution Approach 1:
The patent segments the backlight unit into multiple bar-type PCBs, each dedicated to a specific LED array. This segmentation simplifies wiring within each module while achieving high area efficiency through compact bar-shaped layouts positioned directly beneath the LEDs they serve.
Solution Approach 2:
Each bar-type PCB serves itself and its associated LED array independently, with wiring confined to local connections rather than requiring complex interconnections across a large plate. This self-service approach reduces overall wiring complexity while maintaining area efficiency.
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 enhances the usage efficiency of the printed circuit board area, reduces fabrication costs, and allows for more efficient light distribution in the LED backlight unit by optimizing the placement and connection of LEDs.
Implementation Method 1
a backlight unit installed at a lower portion of the LCD panel for emitting light all over the LCD panel
Implementation Method 2
a light source, namely, a backlight unit, for radiating light onto an LCD panel
Implementation Method 3
a diffusion plate 3 disposed between the LCD panel 1 and the LEDs 2 for diffusing light emitted from the LEDs 2
Implementation Method 4
optical sheets 6 for converting light discharged from the diffusion plate 3 to supply to the LCD panel 1
Data Source
AI summary
Disclosed is a liquid crystal display (LCD) device capable of improving a use efficiency of light emitting diode (LED) printed circuit boards (PCBs) by configuring the existing plate type LED PCBs in a bar type so as to reduce an area used, the LCD device including, an LCD panel configured to display images, a backlight unit disposed at a lower portion of the LCD panel for providing light to the LCD panel, and provided with a plurality of light emitting diode (LED) printed circuit boards (PCBs) formed in a bar type, and a plurality of LEDs disposed on each of the LED PCBs to be spaced apart from each other, and casing components including a mold frame for receiving and fixing the LCD panel and the backlight unit, an upper cover and a bottom cover.