Lighting System Wiring Over Electrode for Luminance Uniformity
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Solution Overview
Problem
Large-area lighting systems using light-emitting elements face issues with luminance nonuniformity due to high resistivity of transparent conductive films, leading to voltage drops and reduced luminance, especially when auxiliary electrodes are partially provided to address these issues.
Innovation Solution
A lighting system design featuring a layer containing a light-emitting substance between a first electrode and a second electrode, with an auxiliary electrode connected through openings in the second electrode, reducing resistivity and maintaining light transmission by positioning the auxiliary electrode outside the light emission direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent conductive film is used as the electrode, then light transmission is achieved, but electrical resistivity is high causing voltage drop
Solution Approach 1:
The patent employs a composite electrode structure combining transparent conductive film (ITO) with auxiliary electrodes made of low-resistivity metal materials. This composite approach allows the system to maintain both light transmission properties of the transparent film and electrical conductivity of the metal auxiliary electrodes, resolving the contradiction between transparency and electrical resistivity.
2Reliability
If auxiliary electrode is provided on the anode, then electrical resistivity is reduced, but light extraction is blocked
Solution Approach 1:
The auxiliary electrode is strategically positioned only in the peripheral regions of the light-emitting element, leaving the central light-emitting area free of obstructions. This local placement provides electrical conductivity where needed at the edges while maintaining light extraction efficiency in the central region, resolving the contradiction between reducing resistivity and preserving light extraction.
3Area of stationary object
If the lighting system has large area, then luminance coverage is improved, but luminance uniformity deteriorates
Solution Approach 1:
The patent divides the electrode system into multiple components: the main transparent conductive film electrode and multiple auxiliary electrodes distributed across the periphery. This segmentation allows each auxiliary electrode to independently supply current to specific regions, ensuring uniform current distribution and luminance across large-area light-emitting elements, thereby resolving the contradiction between area size and luminance uniformity.
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 achieves favorable in-plane luminance uniformity by reducing voltage drops and allowing for arbitrary placement of the auxiliary electrode, enhancing luminance consistency across large areas.
Implementation Method 1
The light-emitting element has a layer containing a light-emitting substance which provides luminescence (Electroluminescence) by applying an electric field thereto
Implementation Method 2
an electrode in the direction of light emission needs to be transparent
Implementation Method 3
a third electrode is formed to connect to the first electrode through an opening formed in the second electrode and the layer containing a light-emitting substance
Data Source
AI summary
It is an object of the present invention to provide a lighting system having favorable luminance uniformity in a light-emitting region when the lighting system has large area. According to one feature of the invention, a lighting system comprises a first electrode, a second electrode, a layer containing a light-emitting substance formed between the first electrode and the second electrode, an insulating layer which is formed over a substrate in a grid form and contains a fluorescence substance, and a wiring formed over the insulating layer. The insulating layer and the wiring are covered with the first electrode so that the first electrode and the wiring are in contact with each other.