Dual-Column LED Lamp Strip for Uniform Backlighting
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Solution Overview
Problem
Existing LED lamp strips suffer from hotspot phenomena due to nonuniform light mixing, resulting in alternate bright and dark spots caused by the overlapping dark areas between adjacent LEDs, leading to inefficient illumination.
Innovation Solution
The implementation of a dual-column LED lamp strip structure on a circuit board, where one column's dark areas fall within the other's bright areas, with alternating lighting at a specific frequency to eliminate hotspots, utilizing a flexible circuit board and a control system with a pulse width generator and phase inverter to generate drive signals with opposite phases for synchronized LED lighting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the space between LEDs is reduced to improve illumination coverage, then the area covered by LED light increases, but the hotspot phenomenon becomes more severe due to overlapping dark areas
Solution Approach 1:
The LED array is divided into multiple independent columns, with each column's dark areas strategically positioned to fall within the bright areas of adjacent columns. This segmentation allows the dark spots of one column to be compensated by the bright spots of another column, achieving uniform overall illumination while maintaining close spacing between LEDs.
2Illumination intensity
If alternating lighting of LED columns is implemented to eliminate hotspots, then illumination uniformity improves, but device complexity increases due to additional control circuits
Solution Approach 1:
The patent implements periodic alternating lighting of different LED columns at a frequency above human visual perception threshold. This periodic switching eliminates the hotspot phenomenon by ensuring that dark areas of one column are compensated during its off-period by adjacent columns, while the high frequency prevents visible flicker, maintaining both illumination uniformity and visual comfort.
3Illumination intensity
If multiple LED columns are used to eliminate hotspots, then illumination uniformity improves, but energy consumption increases due to more LEDs operating
Solution Approach 1:
Instead of operating all LED columns simultaneously, the patent employs periodic alternating operation where columns are switched on and off in sequence at high frequency. This ensures that at any given moment, only certain columns are active, reducing total energy consumption while the rapid switching maintains uniform illumination by compensating dark areas with bright areas from adjacent columns during their active periods.
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 enhances illumination uniformity, reduces energy consumption, and eliminates hotspot issues more effectively than spacing adjustments alone, while allowing for flexible adaptation to various device shapes and minimizing eye fatigue from flicker.
Implementation Method 1
the light emission angle of LED 101 is less than 180 degrees
Data Source
AI summary
Embodiments of the present invention provide an LED lamp strip structure, a backlight module, a liquid crystal display device and a method of controlling the LED lamp strip structure. The LED lamp strip structure comprises: a circuit board; and at least a first LED sequence and a second LED sequence arranged in parallel on the circuit board, the first LED sequence having a plurality of predetermined intervals, and each LED in the second LED sequence corresponding to one of the plurality of predetermined intervals respectively.