Auxiliary Electrode Insulating Layer Prevents Short-Circuiting
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Solution Overview
Problem
The formation of an insular conductive layer during the coating of an auxiliary electrode in light-emitting devices can lead to a short-circuit between the first and second electrodes, disrupting the thickness of the organic layer and affecting the device's performance.
Innovation Solution
A light-emitting device configuration where an auxiliary electrode is formed using a coating material, covered with an insulating layer that embeds gaps between the auxiliary and insular conductive portions, preventing short-circuiting by maintaining the organic layer's thickness and ensuring proper electrode separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If an auxiliary electrode is formed using a coating material, then the manufacturing process is simplified and productivity is improved, but droplets of the coating material may adhere to the periphery forming insular conductive layers that cause short-circuiting
Solution Approach 1:
An insulating layer is introduced as an intermediary substance between the auxiliary electrode and the organic layer. This insulating layer prevents direct contact between conductive elements, eliminating the short-circuiting problem while maintaining the benefits of coating material formation. The insulating layer acts as a mediator that allows the auxiliary electrode to function without causing harmful electrical connections.
Solution Approach 2:
The insulating layer is formed preliminarily to prevent the harmful effect of short-circuiting before it can occur. By applying the insulating layer over the auxiliary electrode and insular conductive portions before forming the organic layer, the patent preemptively blocks the potential short-circuit path, ensuring device reliability from the outset.
2Reliability
If an insulating layer is formed to cover the auxiliary electrode and prevent short-circuiting, then device reliability is improved, but the device structure becomes more complex
Solution Approach 1:
The insulating layer serves multiple functions simultaneously: it provides electrical insulation to prevent short-circuiting, maintains the thickness of the organic layer, and covers both the auxiliary electrode and insular conductive portions in a single layer. This multi-functionality reduces the need for additional separate components, thereby limiting the increase in device complexity.
Solution Approach 2:
The patent merges the insulation function with the thickness control function into a single insulating layer structure. Rather than adding separate insulation layers and thickness control layers, the single insulating layer performs both functions, reducing structural complexity while maintaining reliability.
Data Source
AI summary
A light-emitting device (100) includes a substrate (110), a first electrode (120), an auxiliary electrode (124), an insular conductive layer (126), an insulating layer (170), an organic layer (130), and a second electrode (140). The first electrode (120) is formed over the substrate (110), and is formed using a transparent conductive material. The auxiliary electrode (124) is formed over the first electrode (120). The conductive layer (126) is formed over the first electrode (120), and is formed of the same material as that of the auxiliary electrode (124). The insulating layer (170) is formed over a portion of the first electrode (120), and covers the auxiliary electrode (124) and the conductive layer (126). The organic layer (130) is formed over the first electrode (120), and the second electrode (140) is formed over the organic layer (130).