Organic Light Emitting Display Pixel Capacitor Non-Overlapping Plate Design
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Solution Overview
Problem
Organic light emitting display panels face issues with transistor degradation, leading to increased driving voltage and leakage current, which result in black dots on the panel.
Innovation Solution
The design includes a pixel structure with a storage capacitor where the second plate does not overlap the semiconductor layer, preventing degradation and reducing driving voltage and leakage current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the second plate of the storage capacitor overlaps the semiconductor layer, then the capacitance value increases, but the electric property of the transistor degrades leading to increased driving voltage and leakage current
Solution Approach 1:
The pixel electrode is divided into two separate plates (first plate and second plate) that form the storage capacitor. The first plate is positioned to overlap the semiconductor layer while the second plate is positioned not to overlap the semiconductor layer, thereby segmenting the capacitor structure to prevent transistor degradation while maintaining capacitance function
Solution Approach 2:
The patent positions the second plate of the storage capacitor in a different spatial arrangement relative to the semiconductor layer, specifically ensuring it does not overlap the semiconductor layer in the planar view, thereby resolving the contradiction between capacitance value and transistor electric property through dimensional positioning
2Power
If the transistor electric property degrades, then the driving voltage increases, but this leads to black dots on the panel
Solution Approach 1:
The patent implements a storage capacitor configuration where the second plate does not overlap the semiconductor layer as a preliminary protective measure, preventing transistor degradation before it occurs, thereby maintaining stable driving voltage and preventing black dot formation
3Quantity of substance
If the second plate overlaps the semiconductor layer, then the storage capacitor capacitance increases, but leakage current increases
Solution Approach 1:
The storage capacitor is segmented into two plates with different positioning relative to the semiconductor layer. The first plate overlaps the semiconductor layer to contribute to capacitance, while the second plate is positioned to not overlap, preventing leakage current pathways while maintaining sufficient capacitance value
Data Source
AI summary
A method of manufacturing an organic light emitting display panel, the method including: providing a pixel defined by an intersection of one of a plurality of data lines and one of a plurality of gate lines, the providing the pixel including: providing a transistor, providing a storage capacitor including: a first electrode, and a second electrode, and providing a semiconductor layer, providing a first plate partially overlapping the semiconductor layer in the pixel, the providing a first plate including: providing a gate portion of the transistor, and providing a capacitor-forming portion including the first electrode of the storage capacitor, and providing a second plate on the first plate in the pixel, the second plate including the second electrode of the storage capacitor, the second plate not overlapping the semiconductor layer.