Pixel Structure With Semi-Conductive Pattern Layer for Image Sticking
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Solution Overview
Problem
Flat displays suffer from the image sticking phenomenon, where static frames persistently displayed lead to residual images or contours in subsequent frames, affecting yield rate and display quality.
Innovation Solution
A pixel structure incorporating a semi-conductive pattern layer that adjusts storage capacitance under different operation frequencies and voltages, ensuring the second storage capacitance occupies 30%-80% of the total, to compensate for brightness differences and reduce surface-type image sticking.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional storage capacitor structure is used in a flat display, then the manufacturing process is simple, but the image sticking phenomenon occurs due to insufficient storage capacitance
Solution Approach 1:
The storage capacitor is divided into two separate capacitors: a first storage capacitor formed between the capacitor electrode line and pixel electrode, and a second storage capacitor formed between the semi-conductive pattern layer and capacitor electrode line. This segmentation increases the total storage capacitance to compensate for image sticking while maintaining a relatively simple manufacturing process that uses existing pixel structure layers.
Solution Approach 2:
The semi-conductive pattern layer, which is part of the active device structure, is given a dual function: it serves as both the active device layer and as an electrode for the second storage capacitor. This multi-functionality increases storage capacitance without requiring completely separate capacitor structures, thus improving image sticking resistance while controlling device complexity.
2Reliability
If the storage capacitance is increased to compensate for brightness difference, then the image sticking is reduced, but the device structure becomes more complex
Solution Approach 1:
The first and second storage capacitors are merged into a unified capacitor structure sharing the common capacitor electrode line. This merging approach increases the total storage capacitance for better brightness uniformity and image sticking compensation while avoiding the need for completely separate capacitor structures, thus controlling the increase in device complexity.
Solution Approach 2:
The second storage capacitor is nested within the existing pixel structure by using the semi-conductive pattern layer that is already part of the active device. This nesting approach adds storage capacitance for improved brightness uniformity while utilizing existing structural layers, thereby minimizing the increase in overall device complexity.
3Adaptability or versatility
If a metal-insulator-semiconductor capacitor structure is used, then the storage capacitance is dynamically adjustable, but the manufacturing precision requirements increase
Solution Approach 1:
The metal-insulator-semiconductor capacitor structure allows dynamic adjustment of storage capacitance by changing the electrical parameters (voltage, frequency) applied to the semi-conductive pattern layer. This provides adaptability for different operating conditions and image sticking compensation requirements, though it does require precise control of dielectric layer properties during manufacturing.
Solution Approach 2:
The capacitor uses a composite structure with metal electrode, insulator dielectric layer, and semi-conductive pattern layer. This composite material approach enables dynamic capacitance adjustment through the semi-conductive material's electrical properties while the insulator layer provides stable electrical isolation, balancing manufacturability with adaptability.
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
The pixel structure effectively reduces surface-type image sticking in flat displays by dynamically adjusting capacitance, thereby enhancing display quality and yield rate.
Implementation Method 1
The semi-conductive pattern layer and the capacitor electrode line constitute a second storage capacitor having a second storage capacitance. The semi-conductive material changes the storage capacitance of the storage capacitor under different operation frequencies and different operation voltages.
Data Source
AI summary
A pixel structure including a scan line, a data line, an active device, a pixel electrode, a capacitor electrode line, a semi-conductive pattern layer and at least one dielectric layer is provided. The active device is electrically connected to the scan line and the data line. The pixel electrode is electrically connected to the active device. The capacitor electrode line is located under the pixel electrode. A first storage capacitor is formed between the capacitor electrode line and the pixel electrode. The semi-conductive pattern layer is disposed between the capacitor electrode line and the pixel electrode, the pixel electrode is electrically connected to the semi-conductive pattern layer. A second storage capacitor is formed between the semi-conductive pattern layer and the capacitor electrode line. The dielectric layer is disposed between the capacitor electrode line and the pixel electrode and located between the semi-conductive pattern layer and the capacitor electrode line.