Organic Light Emitting Diode Display Trench Structure Parasitic Capacitance
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Solution Overview
Problem
In organic light emitting diode displays, the high RC load due to parasitic capacitance between the cathode electrode and the data line and driving current line leads to signal delay and luminance fluctuations, hindering high-speed operation and ultra-high resolution performance.
Innovation Solution
The introduction of a trench structure and a color filter with high dielectric permittivity between the cathode electrode and the data line and driving current line, burying most of the data and driving current lines into trenches, and positioning the color filter over them to maximize insulating distance, thereby reducing parasitic capacitance and RC load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the cathode electrode is positioned close to the data line and driving current line, then the device structure is simplified and manufacturing is easier, but parasitic capacitance increases causing signal delay and luminance fluctuations
Solution Approach 1:
The patent introduces a trench structure that extends vertically into the substrate, creating a three-dimensional separation between the cathode electrode and the data/driving current lines. This vertical dimensionality change increases the insulation distance without occupying additional lateral space, thereby reducing parasitic capacitance while maintaining a compact device footprint and manufacturing feasibility.
Solution Approach 2:
The trench acts as an intermediary insulating structure between the cathode electrode and the data/driving current lines. By introducing this intermediate element filled with insulating material, the patent effectively isolates the conductive elements, reducing electromagnetic coupling and parasitic capacitance without requiring the conductive elements to be physically farther apart.
2Reliability
If the insulating distance between the cathode electrode and data line is increased, then parasitic capacitance is reduced improving signal quality, but device area increases reducing resolution
Solution Approach 1:
The patent resolves this area-constraint by transitioning the insulation approach from two-dimensional lateral spacing to three-dimensional vertical separation. The trench extends downward into the substrate, providing increased insulation distance in the vertical dimension while maintaining compact lateral dimensions, thus improving signal quality without increasing device area and preserving ultra-high resolution capability.
3Device complexity
If conventional flat structure is used, then manufacturing process is simple, but RC load is high causing slow charging and limited high-speed operation
Solution Approach 1:
The patent introduces vertical trenches into the otherwise flat device structure. This three-dimensional modification increases the insulation distance between conductive elements, thereby reducing parasitic capacitance and RC load. The result is faster data line charging speed and improved high-speed operation capability, while the trench structure can be integrated into existing manufacturing processes with minimal additional complexity.
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 enhances data line charging characteristics, ensures luminance uniformity, and supports high-speed operation with superior video quality and ultra-high resolution by minimizing parasitic capacitance and RC load, preventing signal delay.
Implementation Method 1
positioning the color filter over them to maximize insulating distance, thereby reducing parasitic capacitance and RC load
Implementation Method 2
The organic light emitting diode radiates the lights due to the energy from the excition formed at the excitation state in which the hole and the electron are recombined at the emission layer EML
Data Source
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AI summary
The present disclosure relates to an organic light emitting diode display. The present disclosure provides an organic light emitting diode display comprising: a substrate (SUB); a buffer layer (BUF) on the substrate; a scan line (SL) running to a horizontal direction on the buffer layer; an intermediate insulating layer (IN) covering the scan line; a first trench having a segment shape apart from the scan line with a predetermined distance and exposing some of the substrate by patterning the intermediate insulating layer and the buffer layer; a data line (DL) running to a vertical direction on the substrate exposed by the first trench and on the intermediate insulating layer; a passivation layer (PAS) covering the data line and the scan line; and a color filter (CF) filling the trench and deposited on the passivation layer.