Pixel Structure Isolator Sidewall Protection
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Solution Overview
Problem
Conventional pixel structures in display panels face challenges in achieving high yield rates due to alignment errors between electrodes, leading to short circuits and reduced aperture ratios, especially as pixel sizes decrease and resolution requirements increase.
Innovation Solution
A pixel structure is developed with an active device, a first protection layer, a first electrode, an isolator, and a second protection layer, where the isolator is formed on the sidewall of the first electrode, ensuring electrical isolation between the first and second electrodes, thus preventing short circuits and improving yield rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of moving object
If the first electrode is placed close to the drain to increase aperture ratio, then power consumption decreases, but alignment errors cause the second protection layer opening to expose the first electrode, resulting in short circuits between first and second electrodes
Solution Approach 1:
An isolator is introduced as an intermediary component between the first electrode and the second electrode. The isolator is formed on the sidewall of the first electrode at the opening position, preventing direct contact between the first and second electrodes even when alignment errors occur. This mediator allows the first electrode to be positioned close to the drain (improving aperture ratio) while maintaining electrical isolation (preventing short circuits and improving yield rate).
Solution Approach 2:
The isolator is formed in advance on the sidewall of the first electrode before the second electrode is deposited. This preliminary action ensures that the electrical isolation structure is already in place before the second electrode is positioned, preventing short circuits even when alignment errors cause the second protection layer opening to expose the first electrode.
2Measurement precision
If pixel size is reduced to meet higher resolution requirements, then display resolution improves, but the predetermined distance between the first electrode boundary and the protection layer opening is forced to be reduced, increasing alignment error risks
Solution Approach 1:
The isolator serves as a buffer structure that compensates for reduced spacing in high-resolution displays. By placing the isolator on the sidewall of the first electrode, it provides an additional safety margin that allows the first electrode to be positioned closer to the protection layer opening without increasing short circuit risks, thus enabling smaller pixel sizes while maintaining manufacturing tolerance.
Solution Approach 2:
Instead of relying solely on planar distance between the first electrode and the protection layer opening, the isolator utilizes the vertical dimension by forming on the sidewall of the first electrode. This dimensional transition provides electrical isolation through a different spatial approach, allowing closer horizontal positioning while maintaining safety margins.
Data Source
AI summary
A pixel structure including an active device, a first protection layer, a first electrode, an isolator, a second protection layer and a second electrode is provided. The active device includes a gate, a source and a drain. The first protection layer covers the active device and has a first opening above the drain. The first electrode is disposed above the first protection layer. The first electrode has a side wall corresponding to the first opening. The isolator covers the side wall of the first electrode. The second protection layer covers the first electrode. The second electrode is disposed on the second protection layer, electrically connected to the drain through the first opening, and electrically isolated from the first electrode by the second protection layer and the isolator.