OLED Display Capacitor Layout to Eliminate Parasitic Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
OLED displays experience unnecessary parasitic capacitance generation due to overlapping electrodes, leading to potential failures in the capacitor and power source lines connected to data lines.
Innovation Solution
The OLED display design includes a configuration where the second capacitor electrode is not overlapped with the data line, with the second power source line separated parallel to the data line, and connected through a contact hole, preventing parasitic capacitance between the data line and the capacitor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the capacitor electrode or power source line is overlapped with the data line to save space, then the device area is reduced, but unnecessary parasitic capacitance is generated causing failure
Solution Approach 1:
The patent resolves the spatial conflict by transitioning from a two-dimensional overlapping layout to a three-dimensional stacked architecture. The capacitor is positioned in a different layer (either above or below) the data line, allowing vertical integration without horizontal overlap. This dimensional change enables space-efficient design while eliminating parasitic capacitance caused by planar overlap between conductive elements.
2Device complexity
If the capacitor and power source lines are positioned close to the data line for compact design, then the device complexity is reduced, but parasitic capacitance generation increases
Solution Approach 1:
The patent introduces an insulating layer as an intermediary between the capacitor/power source lines and the data line. This intermediate insulating structure physically separates the conductive elements, preventing direct electrical interaction and eliminating parasitic capacitance while maintaining compact proximity for efficient space utilization.
Data Source
AI summary
An organic light emitting diode (OLED) display includes: a switching thin film transistor including a switching gate electrode, a switching active layer, a switching source electrode, and a switching drain electrode; a driving thin film transistor including a driving gate electrode, a driving active layer, a driving source electrode, and a driving drain electrode; a capacitor including a first capacitor electrode and a second capacitor electrode; a scan line that is connected to the switching gate electrode of the switching thin film transistor; a data line that intersects the scan line and that is connected to the switching source electrode of the switching thin film transistor; a first power source line that is parallel to the data line and that is connected to the driving source electrode of the driving thin film transistor; a second power source line that is separated parallel to the data line and that is connected to the second capacitor electrode of the capacitor; and an organic light emitting diode that is connected to the driving drain electrode of the driving thin film transistor.