Auxiliary Electrode Films for Uniform Voltage Distribution
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Solution Overview
Problem
Existing organic electroluminescent lighting devices suffer from brightness nonuniformity due to varying voltage distribution caused by auxiliary electrodes with uniform shape and spacing, leading to increased wiring resistance and voltage drop away from the edge sides.
Innovation Solution
The use of belt-like auxiliary electrode films with varying widths and densities, where the sectional area or thickness increases with distance from the edge sides, reducing voltage drop and ensuring uniform voltage distribution across the organic light-emitting film.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If auxiliary electrodes are arranged at equal intervals with uniform shape and thickness, then the device structure is simple and easy to manufacture, but voltage distribution becomes non-uniform causing brightness nonuniformity
Solution Approach 1:
The patent applies local quality by making the auxiliary electrode films have different thicknesses or widths at different positions. Specifically, the auxiliary electrode films are designed with greater thickness or width in regions farther from the edge sides where voltage drop is more significant, thereby locally compensating for voltage distribution nonuniformity and achieving improved brightness uniformity across the organic light-emitting film.
Solution Approach 2:
The patent changes the geometric parameters (thickness or width) of the auxiliary electrode films based on their position. The parameters are adjusted such that auxiliary electrode films farther from the edge sides have larger dimensions, which reduces the wiring resistance and voltage drop in those regions, thereby compensating for the natural voltage distribution gradient and achieving uniform voltage application across the entire organic light-emitting film.
2Illumination intensity
If transparent metallic material is used for electrode film, then light transmission is achieved, but wiring resistance increases causing voltage drop
Solution Approach 1:
The patent introduces auxiliary electrode films as intermediary elements on the transparent electrode surface. These auxiliary electrodes serve as additional current distribution paths that mediate between the power supply terminals and the organic light-emitting film. By providing these intermediate conductive paths, the patent reduces the effective wiring resistance and voltage drop while maintaining the light transmission properties of the transparent electrode material.
Solution Approach 2:
The patent segments the electrode system by adding multiple auxiliary electrode films distributed across the transparent electrode surface. This segmentation creates multiple parallel current paths that reduce the overall wiring resistance. The auxiliary electrodes divide the current distribution into smaller segments, thereby reducing the voltage drop across the entire electrode and improving voltage distribution 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 configuration enhances brightness uniformity by preventing voltage distribution variance in the organic light-emitting film, ensuring consistent illumination across the device.
Implementation Method 1
auxiliary electrode films with varying widths and densities, where the sectional area or thickness increases with distance from the edge sides, reducing voltage drop and ensuring uniform voltage distribution
Implementation Method 2
the organic light-emitting film emits light when an electric field is generated between the pair of electrode films
Data Source
AI summary
An organic electroluminescent lighting device includes: a pair of rectangular electrode films stacked to face each other sandwiching an organic light-emitting element, and different from each other in polarity; wherein a first electrode film includes power supply terminal sections which are each of edge sides which face each other at a surface of the first electrode film; and auxiliary electrode film group including at least one of a plurality of first auxiliary electrode films and a plurality of second auxiliary electrode films located away from each other on the surface of the first electrode film. A sectional area viewed where the plurality of first auxiliary electrode films cuts perpendicularly to the edge sides increases relative to increasing distance from the edge sides. A sectional area viewed where the plurality of second auxiliary electrode films cuts parallel to the edge sides increases relative to increasing distance from the edge sides.