Planar Lighting Device Series Wiring Layout
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Solution Overview
Problem
In planar lighting devices, connecting multiple light source units in parallel leads to increased board width, which can reduce the thickness of the device due to the lateral direction width effect, posing a challenge in design and manufacturing.
Innovation Solution
A planar lighting device design featuring a strip-shaped board with an external connection section that protrudes laterally, where light source units are connected in series with a single external connection section, and electrodes are arranged such that the first electrodes are farther from the connection section than the second electrodes, allowing for reduced wiring width by optimizing the layout of first and second wiring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light source units are connected in parallel, then the light emission coverage is improved, but the board width increases and device thickness cannot be reduced
Solution Approach 1:
The patent transitions from parallel connection (requiring lateral wiring space) to series connection (enabling longitudinal wiring arrangement). By changing the connection dimension from lateral to longitudinal, the wiring is arranged along the length of the strip-shaped board rather than across its width, thereby reducing the board width while maintaining light emission coverage through multiple light source units
Solution Approach 2:
The patent employs asymmetric wiring arrangement where the first wiring connects the external connection section to the first electrode, and the second wiring connects to the second electrode, with deliberate positioning of electrodes at different distances from the external connection section. This asymmetric layout optimizes the wiring path to minimize lateral space occupation while ensuring proper electrical connection for parallel light source units connected in series
2Illumination intensity
If multiple light source units are connected in parallel, then the light emission coverage is improved, but the device thickness increases
Solution Approach 1:
The patent resolves the thickness issue by changing the wiring arrangement from lateral (affecting thickness) to longitudinal (affecting length). The strip-shaped board configuration with longitudinal wiring allows the device to achieve thin profile by eliminating the need for thick lateral wiring structures, while multiple light source units connected in series provide adequate light emission coverage
3Area of stationary object
If a single external connection section is used with series connection, then the board width is reduced, but the wiring layout complexity increases
Solution Approach 1:
The patent applies local quality by positioning the first electrode and second electrode at different locations relative to the external connection section. The first electrode is positioned at a first distance while the second electrode is positioned at a second distance, creating localized electrode arrangements that simplify the wiring path. This localized optimization reduces overall wiring layout complexity while maintaining the benefits of series connection and reduced board width
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 minimizes the number of parallel wiring components in the longitudinal direction, reducing the board width and enabling thinner planar lighting devices while maintaining stable light emission from the light source units.
Implementation Method 1
a top-view type light emitting diode (LED) is provided such that it is opposed to the side surface of a light guide plate
Data Source
AI summary
A planar lighting device includes: a board that includes a strip-shaped section, and an external connection section, which protrudes from the central part of the strip-shaped section in a lateral direction of the strip-shaped section, and that is provided with an installation surface; and light source units that are provided with a plurality of light sources connected in series, that are each provided with a first electrode and a second electrode on both end sides, and that are arranged side by side on the installation surface at the strip-shaped section of the board in a longitudinal direction. Furthermore, the single external connection section is provided for the light source units, and the first electrodes in all the light source units, related to the single external connection section, are located farther from the external connection section than the second electrodes in the light source units.