OLED Shielding Electrode Reduces Parasitic Capacitance
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Solution Overview
Problem
In organic light-emitting diode (OLED) displays, the parasitic capacitor formed by the overlap of scan lines and data lines leads to voltage ripples due to changes in data voltage, resulting in reduced display quality and reliability, particularly in high-resolution devices where elements and lines are closely integrated.
Innovation Solution
Incorporating a shielding electrode between the horizontal and data lines, connected to a constant voltage source, to reduce or prevent voltage ripples by shielding the horizontal line from the data line, thereby minimizing parasitic capacitance and its effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the size of pixels is reduced to achieve high resolution, then display resolution is improved, but parasitic capacitance between scan lines and data lines increases due to closer integration
Solution Approach 1:
A shielding electrode is introduced as an intermediary element between the scan line and data line. This shielding electrode, connected to a reference potential, acts as a mediator that reduces the parasitic capacitance coupling between the scan line and data line, thereby mitigating the harmful effect of voltage ripples while maintaining the high-resolution pixel structure
2Productivity
If scan lines and data lines are integrated closely to reduce pixel size, then productivity is improved, but voltage ripples occur due to parasitic capacitor formation
Solution Approach 1:
The shielding electrode serves as a protective intermediary that decouples the electrical interaction between scan lines and data lines. By placing this shielding structure between the two signal lines and connecting it to a stable reference potential, the patent prevents voltage ripples from propagating while maintaining close integration of scan and data lines for high pixel density
3Reliability
If a shielding electrode is added to prevent voltage ripples, then reliability is improved, but device complexity increases
Solution Approach 1:
The shielding electrode structure is merged with the existing pixel electrode structure. The shielding electrode is formed as an extension or integration of the pixel electrode, allowing it to serve dual functions: maintaining the pixel's electrical characteristics and providing shielding against parasitic capacitance, thereby reducing the net increase in device complexity
Data Source
AI summary
An organic light-emitting diode display and a method of manufacturing the same are provided. An organic light-emitting diode display includes a plurality of pixels, each pixel includes an organic light-emitting diode, and the organic light-emitting diode display includes: a substrate, a horizontal line on the substrate, at least one first insulating layer on the horizontal line, a shielding electrode on the at least one first insulating layer, at least one second insulating layer on the shielding electrode, a data line on the at least one second insulating layer, the data line crossing the horizontal line, the shielding electrode overlapping the horizontal line and the data line at a crossing of the horizontal line and the data line, and a constant voltage source connected to the shielding electrode.