Organic Light Emitting Apparatus With Segmented Electrodes
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Solution Overview
Problem
Designing a light emitting apparatus with an organic light emitting layer to maintain a constant difference in luminance at the boundary line between adjacent units, both when the entire layer emits light and when only a part of it emits light, is challenging due to variations in voltage stabilization and resistance properties.
Innovation Solution
The apparatus features a substrate with linear first and second organic light emitting layers, independent anodes and cathodes that are not connected, allowing for independent resistance design and uniform luminance distribution across multiple units when connected in series.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the cathode is made as a solid electrode and the organic light emitting layer and other electrode are made linear to stabilize voltage, then voltage stability is improved, but luminance uniformity deteriorates because luminance changes even when the same voltage is applied
Solution Approach 1:
The patent divides the light emitting apparatus into multiple independent luminous bodies (first luminous body and second luminous body) with separate anodes and cathodes. Each luminous body has its own independent electrode connections, allowing individual control of current density and luminance. This segmentation enables uniform luminance across the entire display area while maintaining voltage stability through standardized electrode structures.
2Illumination intensity
If multiple light emitting apparatuses are used in parallel to increase light output, then total luminance is improved, but boundary line visibility worsens due to difficulty in maintaining constant luminance difference at boundaries
Solution Approach 1:
The patent segments the display into multiple independent light emitting apparatuses, each with its own electrode connections. This allows precise control of current density in each segment, enabling uniform luminance at boundaries while maintaining high total luminance through parallel operation of multiple units.
Solution Approach 2:
The patent applies different electrode configurations and wiring lengths to different regions of the display. By adjusting the wiring length from connectors to scanning electrodes in specific regions, the resistance values are optimized locally to achieve uniform luminance at boundaries while maintaining high overall brightness.
3Manufacturing precision
If the wiring length from connector to scanning electrode is increased to make resistance values identical, then resistance uniformity is improved, but device complexity worsens due to redundant wiring
Solution Approach 1:
The patent optimizes wiring length locally in different regions of the display to achieve uniform resistance values. By carefully designing the wiring path lengths from connectors to scanning electrodes in specific areas, the resistance values are equalized without requiring excessive redundant wiring throughout the entire device.
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 ensures a consistent luminance difference at the boundary line between adjacent units, improving the emission intensity and visibility by maintaining a low luminance variation, making the boundary line less noticeable.
Implementation Method 1
One of the devices for converting electric energy into light is an organic electro luminescence (EL) device
Data Source
AI summary
A first luminous body is formed on a substrate and is linear. A second luminous body is also formed on the substrate and is linear. The second luminous body extends in parallel with the first luminous body. A first anode and a first cathode are formed on the substrate, and supply electric power to the first luminous body. A second anode and a second cathode are also formed on the substrate, and supply electric power to the second luminous body. The first anode and the first cathode extend in parallel with each other, and the second anode and the second cathode extend in parallel with each other. In a range overlapping with the first luminous body when seen in a plan view, the first anode is not connected to the second anode, and the first cathode is not connected to the second cathode.