LED Backlight Assembly with Segmented Units for Selective Repair
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Solution Overview
Problem
In existing backlight assemblies for LCD modules, defective LEDs in a row often require the entire row to be replaced, leading to waste of non-defective LEDs, reduced productivity, and increased production costs.
Innovation Solution
The backlight assembly is designed with individual LED units, each containing a printed circuit board, a reflective sheet with holes for the LEDs, and a bottom frame, allowing for selective replacement and repair of defective LEDs without replacing entire rows, with electrical connections between units via bent lines on the printed circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire row of PCBs with LEDs is replaced when a few LEDs are defective, then the reliability of the display is maintained, but the loss of non-defective LEDs increases and productivity decreases
Solution Approach 1:
The backlight assembly is divided into multiple independently replaceable LED units, each containing a small number of LEDs (e.g., 3 LEDs per unit). This segmentation allows only the defective LED unit to be replaced rather than the entire row, reducing waste of functional LEDs while maintaining display reliability.
2Reliability
If the entire row of PCBs with LEDs is replaced when a few LEDs are defective, then the reliability of the display is maintained, but the productivity and production costs are reduced
Solution Approach 1:
The backlight assembly is divided into multiple independently replaceable LED units, each containing a small number of LEDs (e.g., 3 LEDs per unit). This segmentation allows only the defective LED unit to be replaced rather than the entire row, reducing waste of functional LEDs while maintaining display reliability.
3Illumination intensity
If multiple PCBs with LEDs are disposed in a row, then the light output is increased, but the complexity of the assembly increases
Solution Approach 1:
Multiple LED units are electrically connected in parallel through a simplified bus bar structure rather than complex individual wiring. The bus bar provides common power and signal connections to all LED units, reducing wiring complexity while maintaining the ability to provide sufficient light output through the combined emission of multiple units.
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 approach enables selective repair or replacement of defective LEDs, improving productivity and reducing costs by minimizing waste and the need for extensive modifications, while maintaining uniform brightness and color consistency.
Implementation Method 1
the LEDs 24 are able to emit red, green and blue light. Therefore, a white light is obtained by uniformly mixing the red, green and blue light
Implementation Method 2
The backlight assembly 20 also includes a transparent window 30 disposed on the reflective sheet 26
Data Source
AI summary
A backlight assembly includes a plurality of light emitting diode units, each of the plurality of light emitting diode units including at least one light emitting diode and a printed circuit board mounting the at least one light emitting diode, and a reflective sheet on the printed circuit board, the reflective sheet having at least one hole corresponding to the at least one light emitting diode, such that the at least one light emitting diode is exposed through the hole, wherein the plurality of light emitting diode units are spaced apart and are electrically connected to each other via at least one line extending from the printed circuit board, the at least one line is bent toward a predetermined direction.