Single-Layer PCB Branch Line Routing for Cost Reduction
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Solution Overview
Problem
The high unit cost of multi-layer circuit boards used in backlight units for LCDs, which are necessary to prevent wiring intersections, limits the cost-effectiveness of LED-based light sources.
Innovation Solution
A single-layer circuit board design where light-emitting elements are arranged in a line and connected by branch lines on opposite sides, preventing branch line intersections and allowing for a cost-effective production method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a multi-layer circuit board is used to prevent wiring intersections, then the reliability of electrical connections is improved, but the unit cost of the circuit board increases
Solution Approach 1:
The patent applies dimensionality change by transitioning from a multi-layer vertical arrangement to a single-layer planar arrangement. Branch lines are routed on opposite sides of the light-emitting element line, utilizing the two-dimensional plane effectively to prevent intersections without requiring additional layers, thus reducing manufacturing cost while maintaining connection reliability
Solution Approach 2:
The circuit board is segmented into distinct regions: light-emitting elements arranged in a line, branch lines on a first side, and branch lines on a second side. This segmentation allows each component group to be independently routed and connected, preventing wiring intersections on a single layer while maintaining organizational clarity and connection reliability
2Ease of manufacture
If a single-layer circuit board is used to reduce unit cost, then the unit cost is reduced, but wiring intersections may occur reducing connection reliability
Solution Approach 1:
The patent utilizes the two-dimensional plane of a single-layer circuit board by positioning branch lines on opposite sides of the light-emitting element line. This spatial arrangement in opposite directions prevents wiring intersections while maintaining all connections on one layer, achieving cost reduction without sacrificing reliability
Solution Approach 2:
The circuit board layout employs asymmetric arrangement where branch lines are positioned on opposite sides of the light-emitting element line rather than symmetrically on one side. This asymmetric configuration optimizes space utilization and prevents wiring intersections, ensuring reliable connections on a single layer
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 design maintains luminance uniformity while reducing the unit cost of the substrate and circuit board, enabling more economical LED-based backlight units for displays.
Implementation Method 1
Light-emitting diodes (LEDs) consume relatively low power while providing the same luminance as conventional light-emitting elements
Data Source
AI summary
A circuit board for a display apparatus includes a substrate, a plurality of light-emitting elements arranged substantially in a line on the substrate, and a plurality of branch lines connecting the light-emitting elements to each other in series. A first group of the plurality of branch lines is formed on a first side of the line of the plurality of light-emitting elements, and a second group of the plurality of branch lines is formed on a second, opposing side of the line of the plurality of light-emitting elements.