Backlight Sensing Line Layout for Uniform Resistance Control
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Solution Overview
Problem
Existing backlight units experience power loss and heat generation due to varying resistance values in sensing lines connected to light source blocks, leading to inefficiencies in light source drivers.
Innovation Solution
The backlight unit design includes sensing lines with varying lengths and cross-sectional areas to ensure uniform resistance values across different areas, minimizing power consumption and heat generation by optimizing the driving voltage applied to each light source block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If sensing lines have uniform cross-sectional area regardless of length, then manufacturing is simplified, but power loss and heat generation increase due to varying resistance values
Solution Approach 1:
The patent applies local quality by varying the cross-sectional area of sensing lines according to their specific location and length. Sensing lines longer than a reference length are designed with a first cross-sectional area, while those shorter than the reference length use a second cross-sectional area. This localized differentiation ensures that each sensing line has optimal resistance characteristics for its specific application, reducing power loss and heat generation while maintaining manufacturing feasibility through standardized area values.
2Loss of energy
If sensing lines have different cross-sectional areas to match length variations, then power loss and heat generation are minimized, but manufacturing complexity increases
Solution Approach 1:
The patent implements parameter changes by systematically adjusting the cross-sectional area parameter of sensing lines based on their length parameter. By establishing a reference length and defining two discrete cross-sectional area values (first and second areas), the patent transforms the continuous variation problem into a discrete parameter optimization. This approach minimizes power loss through resistance matching while controlling manufacturing complexity by limiting the number of distinct area specifications.
3Power
If driving voltage is increased to compensate for high resistance in long sensing lines, then light source blocks receive adequate power, but power loss and heat generation in sensing lines increase
Solution Approach 1:
The patent resolves this contradiction by changing the resistance parameter of sensing lines through cross-sectional area adjustment, rather than compensating with increased driving voltage. By optimizing the sensing line resistance to match the length of the connected light source block, the patent ensures adequate power delivery while minimizing I²R losses. This approach reduces both power loss and heat generation in the sensing lines while maintaining proper power delivery to all light source blocks.
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 reduces power loss and heat generation in the sensing lines and light source drivers, enhancing the overall efficiency of the backlight unit.
Implementation Method 1
sensing lines connected to a plurality of light source blocks disposed in each of a plurality of areas of a substrate may have different cross-sectional areas according to lengths of the sensing lines, respectively. Therefore, sensing lines connected to a plurality of light source blocks in one area may have the same resistance value
Implementation Method 2
a plurality of light source blocks LB, each including at least one light emitting diode (LED)
Data Source
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AI summary
A backlight unit comprises a substrate comprising a first area and a second area, each having a plurality of light source blocks, and a light source driver disposed on at least one side of the substrate and connected to the light source blocks of each of the first and second areas through each of first and second sensing lines. The first sensing lines connected to each of the light source blocks of the first area have a first resistance value, and the second sensing lines connected to each of the light source blocks of the second area have a second resistance value.