Organic EL Display Metal Interconnect Leakage Current
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Solution Overview
Problem
In organic EL display devices, the common layer among pixels leads to leakage current, causing adjacent pixels to emit light and deteriorating color reproducibility (purity).
Innovation Solution
A metal interconnect is formed around the anode electrode and electrically connected to the organic layer, with its potential set lower than the anode electrode's potential in the non-light-emission state, redirecting leakage current away from adjacent pixels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a common layer is formed in the organic layer among pixels, then the device complexity is reduced and manufacturing is simplified, but leakage current occurs causing adjacent pixels to emit light and color reproducibility deteriorates
Solution Approach 1:
An insulating layer is introduced as an intermediary between adjacent pixels in the common organic layer. This insulating layer acts as a barrier that prevents leakage current from spreading to adjacent pixels while maintaining the simplicity of the common layer structure. The insulating layer is formed in regions where pixels are adjacent to each other, effectively blocking the harmful electrical conduction path without complicating the overall device architecture.
2Manufacturing precision
If a common layer is formed in the organic layer among pixels, then manufacturing precision requirements are reduced, but color reproducibility (purity) deteriorates due to light emission from adjacent pixels
Solution Approach 1:
The insulating layer serves as a physical and electrical barrier that prevents both current leakage and unintended light emission from adjacent pixels. By forming this insulating layer in the common organic layer region, the patent achieves better color reproducibility without requiring stricter manufacturing alignment precision, as the insulating layer provides a robust isolation mechanism.
3Object-affected harmful factors
If the metal interconnect potential is set lower than the anode electrode potential in non-light-emission state, then leakage current is redirected away from adjacent pixels, but energy consumption increases due to potential maintenance
Solution Approach 1:
The metal interconnect is set to a specific potential level (lower than the anode electrode potential in non-light-emission state) to create an equipotential region that redirects leakage current. This potential configuration creates a favorable electrical gradient that channels leakage current through the insulating layer and metal interconnect path rather than allowing it to spread to adjacent pixels, effectively controlling current flow direction.
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 light emission in adjacent pixels, thereby improving color reproducibility (purity) by redirecting leakage current through the metal interconnect.
Implementation Method 1
The potential of the metal interconnect is set to a potential lower than the potential of the anode electrode in the non-light-emission state of the organic EL element
Implementation Method 2
leakage to a pixel that adjoins occurs through this common layer and the pixel that adjoins also emits light slightly due to this leakage
Implementation Method 3
The organic EL element utilizes electroluminescence (EL) of an organic material and uses a phenomenon in which an organic thin film emits light when an electric field is applied thereto
Data Source
AI summary
Disclosed herein is an organic EL display device in which pixels each including an organic EL element formed by interposing an organic layer between an anode electrode and a cathode electrode are arranged in a matrix, the organic EL display device including: a common layer configured to be included in the organic EL element and be formed in the organic layer in common to the pixels; and a metal interconnect configured to surround periphery of the anode electrode and be electrically connected to the organic layer, wherein potential of the metal interconnect is set to a potential lower than potential of the anode electrode in a non-light-emission state of the organic EL element.