Inclined Electrode Structure to Suppress OLED Pixel Current Leakage
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Solution Overview
Problem
Current electronic devices with organic light emitting and photoelectric conversion elements face significant issues with current leaks between adjacent elements, leading to unintended light emission and noise, which degrade the performance and color gamut of display apparatuses.
Innovation Solution
The proposed solution involves an electronic device with a substrate-based configuration where an insulating layer has inclined portions, and the organic layer is formed with varying thicknesses on these inclined portions to reduce current leaks, with a thinner layer on one portion and a thicker layer on another, ensuring effective charge recombination and reduced crosstalk between sub-pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the organic layer thickness is uniformly increased to suppress current leak, then device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent applies preliminary action by forming the insulating layer with an inclined portion before depositing the organic layer. The inclined portion is created in advance during insulating layer formation, which establishes the geometric template that will naturally produce the desired thickness variation in the subsequently deposited organic layer. This preliminary structuring of the insulating layer simplifies the organic layer deposition process, as the thickness variation is achieved through the pre-formed inclination rather than requiring complex controlled deposition techniques.
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 effectively suppresses current leaks between adjacent elements, enhancing the performance and color purity of the display apparatus by promoting charge recombination and reducing unwanted light emission.
Implementation Method 1
operates as a light emitting device that emits light with recombination of electrons injected from the cathode and holes injected from the anode
Implementation Method 2
operates as a photoelectric conversion device that takes out electrons and holes from the cathode and the anode, respectively, the electrons and the holes being generated by the organic layer upon absorbing light
Data Source
AI summary
An electronic device including elements arranged on a substrate, each of the elements including an insulating layer, a first electrode, a functional layer, and a second electrode in mentioned order starting from a side closer to the substrate. The insulating layer has an inclined portion that is inclined relative to the substrate. The first electrode has a first portion positioned on the inclined portion and a second portion in contact with the functional layer. The second portion has a smaller inclination angle relative to the substrate than the first portion. A thickness of the functional layer positioned on the first portion in a direction normal to a functional layer surface in contact with the first portion is smaller than a thickness of the functional layer positioned on the second portion in a direction normal to a functional layer surface in contact with the second portion.