Lighting Device With Segmented Electrodes To Suppress Voltage Drop
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Solution Overview
Problem
Existing lighting devices with large light-emitting regions face challenges in minimizing voltage drop due to the high resistance of conductive materials used for electrodes, which affects the efficiency and uniformity of light emission.
Innovation Solution
The integration of light-emitting elements in series with optimized auxiliary wirings and electrode arrangements, using conductive layers with low resistance materials like copper, and incorporating an insulating layer to prevent short circuits, allows for efficient light emission and reduced voltage drop.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conductive material with light-transmitting property (such as ITO) is used for electrode layers, then light emission can be achieved, but the resistance value increases causing voltage drop
Solution Approach 1:
The patent divides the conductive layer into multiple segments: a lower conductive layer (auxiliary wiring) made of low-resistance material like copper, and an upper conductive layer (electrode) made of light-transmitting material like ITO. This segmentation allows each layer to perform its specialized function - the lower layer provides low-resistance current paths while the upper layer provides light transmission, resolving the contradiction between light emission and voltage drop.
2Loss of energy
If multiple auxiliary wirings with different widths and thicknesses are used to suppress voltage drop, then the device complexity increases
Solution Approach 1:
The patent applies local quality by making the auxiliary wiring have different line widths and thicknesses at different locations. The auxiliary wiring has a first line width in a first region and a second line width in a second region, with the second line width being greater than the first. This localized variation optimizes current distribution and voltage drop suppression in different areas without requiring complete redesign of the entire wiring structure.
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 configuration enhances light emission efficiency, increases the total emission area, and provides a thin, lightweight, and impulse-resistant lighting device with improved durability and power efficiency.
Implementation Method 1
a light-emitting member which exhibits electroluminescence (EL)... an EL layer is interposed between a pair of electrodes and voltage is applied to the EL layer, so that electrons injected from a cathode and holes injected from an anode are recombined in an emission center of the EL layer to form molecular excitons, and the molecular excitons release energy when returning to a ground state; thus, light is emitted
Data Source
AI summary
For integration of light-emitting elements and for suppression of a voltage drop, plural stages of light-emitting element units provided over a substrate having an insulating surface and each including a plurality of light-emitting elements which is connected in parallel are connected in series. Further, besides a lead wiring with a large thickness, a plurality of auxiliary wirings with different widths and different thicknesses is used, and the arrangement of the wirings, electrodes of the light-emitting elements, and the like is optimized. Note that in the lighting device, light emitted from the light-emitting element passes through the substrate having an insulating surface and then is extracted.