OLED Anode Drain Electrode Merging for Static Shielding
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Solution Overview
Problem
Organic light emitting display devices are susceptible to deterioration and mura stains caused by static electricity from external sources, which affect the performance of driving transistors and visibility.
Innovation Solution
The design includes a semiconductor pattern layer, gate electrode, and drain electrodes configured to form a channel area that completely overlaps the first drain electrode, creating a capacitor with the anode electrode, which helps prevent static electricity from impacting the driving transistor and reduces mura stains by acting as a protective layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional transistor structure is used in the organic light emitting display device, then the device complexity is reduced and manufacturing is easier, but the driving transistor is susceptible to static electricity from external sources causing deterioration and mura stains
Solution Approach 1:
The patent merges the first drain electrode with the anode electrode, making them a single integrated structure. This merging reduces the number of separate components while providing dual functionality: the electrode serves as both the drain electrode for the transistor and the anode electrode for the organic light emitting element, thereby reducing device complexity while maintaining protection from static electricity
Solution Approach 2:
The first drain electrode/anode electrode structure performs multiple functions simultaneously: it acts as the drain electrode for the driving transistor, the anode electrode for the organic light emitting element, and a shielding electrode that protects against static electricity. This multi-functionality reduces the overall number of components needed in the display device
2Reliability
If the channel area completely overlaps the first drain electrode to form a capacitor, then protection from static electricity is improved, but the manufacturing precision requirements increase
Solution Approach 1:
By merging the first drain electrode and anode electrode into a single structure, the patent eliminates the need for precise alignment between two separate electrodes. The unified structure inherently achieves complete overlap with the channel area, providing shielding protection while reducing manufacturing precision requirements
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 shields the driving transistor from static electricity-induced deterioration and prevents mura stains, enhancing the reliability and image quality of the organic light emitting display device.
Implementation Method 1
The anode electrode and the first drain electrode may form a capacitor
Implementation Method 2
These electrons and holes are recombined in the emission layer to form excitons. The excitons change from an excited state to a ground state to emit light, thereby displaying images.
Data Source
AI summary
Provided are an organic light emitting display device and method for manufacturing the same. According to an aspect of the present inventive concept, an organic light emitting display device including: a substrate; a common power line, a first drain electrode, and a second drain electrode each disposed on the substrate; a semiconductor pattern layer connected to the common power line and the second drain electrode; a gate electrode overlapping the semiconductor pattern layer; and an anode electrode connected to the second drain electrode. The semiconductor pattern layer, the gate electrode and the first drain electrode all overlap.