Light-Emitting Device Non-Overlapping Conduction Holes
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Solution Overview
Problem
Existing light-emitting devices with organic electroluminescent (EL) materials face issues with height differences and insufficient conduction between electrodes and peripheral wiring due to overlapping conduction holes and insulating layers, leading to reduced contact areas and increased resistance.
Innovation Solution
A light-emitting device configuration where conduction holes do not overlap, allowing for non-overlapping insulating layers and continuous frame-shaped conductors surrounding the display region, ensuring full periphery electrical connections and reduced height differences, and incorporating light-shielding or reflective layers to prevent current leakage and simplify manufacturing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conduction holes of wiring side insulating layer and electrode side insulating layer overlap each other in plan view, then electrical connection between power supply wiring and second electrode is achieved, but height difference between surfaces occurs corresponding to sum of film thicknesses of insulating layers
Solution Approach 1:
The patent transitions from a two-dimensional overlapping conduction hole structure to a three-dimensional stepped structure by introducing an intermediate conductor. The intermediate conductor is formed at a different height level (on the wiring side insulating layer surface) than the second electrode (on the electrode side insulating layer surface), creating a stepped connection that eliminates the height difference while maintaining electrical connectivity through the insulating layers.
2Ease of manufacture
If peripheral edge of light-emitting functional layer overlaps inside of conduction hole, then manufacturing is simplified, but contact area between second electrode and peripheral wiring is reduced leading to insufficient conduction
Solution Approach 1:
The intermediate conductor acts as a mediator between the second electrode and the power supply wiring. It provides an additional conduction path through the wiring side insulating layer, ensuring sufficient electrical connection even when the light-emitting functional layer overlaps the conduction hole region. This intermediary structure compensates for the reduced contact area caused by the overlapping configuration.
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 reduces height differences, enhances conduction between electrodes and peripheral wiring, lowers resistance, and prevents current leakage, resulting in improved performance and manufacturing efficiency.
Implementation Method 1
a light-emitting element which is disposed in a display region of a base body and includes a first electrode, a second electrode, and a light-emitting functional layer that emits light according to current between the first electrode and the second electrode
Data Source
AI summary
A light-emitting device includes: a light-emitting element which is disposed in a display region of a base body and includes a first electrode, a second electrode, and a light-emitting functional layer; a first conductor; a first insulating layer which covers the first conductor; a second conductor; and a second insulating layer which covers the second conductor. The second electrode is formed on a surface of the first insulating layer and is electrically connected to the first conductor via a first conduction hole of the first insulating layer, the first conductor is formed on a surface of the second insulating layer and is electrically connected to the second conductor via a second conduction hole of the second insulating layer, and the first conduction hole and the second conduction hole are configured not to overlap each other in a plan view.