OLED Shield Gate Electrode Parasitic Capacitance Reduction
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Solution Overview
Problem
In high-resolution OLED displays, parasitic capacitance between the data line and the driving gate electrode is not effectively shielded, leading to degraded image quality due to the lack of overlap between gate electrodes.
Innovation Solution
The introduction of a shield gate electrode and shield channel, connected through contact holes to the driving voltage line, which shields parasitic capacitance between the data line and the driving gate electrode, thereby improving image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If gate electrodes do not overlap each other in high-resolution displays, then manufacturing complexity is reduced, but parasitic capacitance between data line and driving gate electrode increases
Solution Approach 1:
A shield gate electrode is introduced as an intermediary element between the data line and the driving gate electrode. This shield gate electrode acts as a mediator to block the parasitic capacitance coupling, allowing the data line and driving gate electrode to be positioned without overlap while maintaining low parasitic capacitance. The shield gate electrode is connected to a fixed potential (ground or reference voltage) to effectively terminate the electromagnetic field coupling.
Solution Approach 2:
The gate electrode structure is segmented into multiple functional parts: a driving gate electrode for transistor control and a separate shield gate electrode for parasitic capacitance reduction. This segmentation allows each component to perform its specific function independently, enabling the driving gate to control the transistor while the shield gate simultaneously protects against parasitic capacitance effects on the data line.
2Reliability
If parasitic capacitance is shielded using traditional methods, then image quality improves, but device complexity increases
Solution Approach 1:
The shield gate electrode is merged with the existing gate electrode fabrication process and structure. Both the driving gate electrode and shield gate electrode are formed using the same gate patterning and deposition steps, integrating the shielding function into the standard transistor manufacturing flow. This merging approach adds minimal complexity while effectively reducing parasitic capacitance and improving image quality.
Data Source
AI summary
An organic light-emitting diode (OLED) display is disclosed. In one aspect, the display includes a scan line formed over a substrate and configured to provide a scan signal. A data line crossing the scan line is configured to respectively provide a data voltage, and a driving voltage line crossing the scan line is configured to respectively provide a driving voltage. The display includes a switching transistor electrically connected to the scan line and the data line and including a drain electrode configured to output the data voltage. A driving transistor includes a driving gate electrode electrically connected to the drain electrode of the switching transistor. A contact hole is formed between the driving gate electrode and the data line, and the driving voltage line passes through the contact hole to be connected to a conductive layer.