Modular LED Backlight Assembly for LCD Repair Efficiency
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Solution Overview
Problem
Existing backlight assemblies for LCDs are costly and time-consuming to repair due to the need to replace entire PCBs when LEDs are damaged, and they lack flexibility in brightness adjustment and color mixing, especially when using direct-type backlight units with LEDs arranged in rows.
Innovation Solution
A modular backlight assembly with multiple sub-units arranged in a matrix, each containing LEDs emitting predetermined colors, surrounded by a sidewall and connected to a driving circuit, allowing for separate replacement and division driving, enhancing repair efficiency and brightness control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If LEDs are arranged in rows on a single PCB for direct-type backlight units, then brightness coverage is improved, but repair cost and time increase when LEDs are damaged
Solution Approach 1:
The backlight unit is divided into multiple independent modules, each containing a subset of LEDs. When an LED fails, only the specific module containing that LED needs to be replaced rather than the entire PCB assembly. This segmentation resolves the contradiction by maintaining full brightness coverage through multiple modules while dramatically reducing repair complexity and cost.
Solution Approach 2:
Individual LED modules are extracted as separate replaceable units from the overall backlight system. Each module can be independently removed and replaced without affecting other modules, allowing for selective replacement of only the defective module rather than the entire backlight assembly.
2Stability of the object's composition
If LEDs are fixed in position on PCBs, then structural stability is improved, but flexibility in brightness adjustment and color mixing is reduced
Solution Approach 1:
The system transitions from a static, fixed LED configuration to a dynamic modular architecture where individual LED modules can be independently controlled. Each module can be selectively activated or deactivated, and their brightness and color can be adjusted independently through the driving circuit, providing dynamic adaptability while maintaining structural stability through standardized module designs.
Solution Approach 2:
By segmenting the backlight into independent controllable modules, the system gains flexibility in brightness adjustment and color mixing without compromising the structural stability of each individual module. Each module can be precisely controlled to achieve various lighting effects while maintaining its fixed structural integrity.
3Reliability
If entire PCB assemblies are replaced when LEDs are damaged, then reliability is maintained, but loss of time and increased cost occur
Solution Approach 1:
The backlight system is segmented into independent replaceable modules, allowing repair personnel to replace only the specific defective module rather than the entire PCB assembly. This maintains system reliability by ensuring proper functionality while dramatically reducing repair time and associated costs.
Solution Approach 2:
The defective LED module is extracted and replaced as a separate unit, eliminating the need to replace the entire PCB assembly. This approach preserves reliability by ensuring proper electrical connections and functionality while minimizing downtime and repair resource consumption.
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
The modular design reduces repair costs and time, provides uniform surface light, and enables flexible brightness and color adjustment, improving image quality and operational efficiency.
Implementation Method 1
a light emitting diode (LED) unit that includes at least one LED emitting a predetermined color
Data Source
AI summary
A backlight assembly includes at least one backlight sub-unit, the backlight sub-unit including a light emitting diode (LED) unit that includes at least one LED that emit a predetermined color arranged in a predetermined pattern and a sidewall surrounding the LED unit.