Shielding Electrode Layout for Display Pixel Alignment Stability
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Solution Overview
Problem
Display devices face challenges in maintaining accurate alignment of light emitting elements due to deviations in electrical coupling and field interactions between data conductors and pixel electrodes, leading to potential short-circuits and reduced efficiency.
Innovation Solution
A display device structure incorporating a shielding electrode between the data conductor and pixel electrode layers, with strategically designed contact openings and insulating layers to prevent short-circuits and align light emitting elements effectively, using a method that includes forming a shielding electrode on the substrate and aligning light emitting elements through applied voltages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a data conductor and pixel electrode layer are directly electrically coupled, then electrical connection is achieved, but alignment deviation and short-circuit risk increase
Solution Approach 1:
A shielding electrode is introduced as an intermediary component between the data conductor and pixel electrode layer. This shielding electrode defines contact openings that enable electrical coupling while preventing direct contact between the data conductor and pixel electrode layer, thereby reducing alignment deviation and short-circuit risk without significantly increasing structural complexity
Solution Approach 2:
The electrical coupling path is segmented into multiple stages: the data conductor connects to the shielding electrode through first contact openings, and the shielding electrode connects to the pixel electrode layer through second contact openings. This segmentation allows for better alignment control and reduces the impact of misalignment between directly coupled elements
2Reliability
If shielding electrode is added between data conductor and pixel electrode layer, then alignment deviation is reduced, but device complexity increases
Solution Approach 1:
The shielding electrode serves multiple functions simultaneously: it provides electrical coupling between data conductor and pixel electrode layer through defined contact openings, shields against electric field interference, prevents short-circuits, and maintains alignment accuracy. This multi-functionality justifies the additional layer by delivering multiple benefits from a single component
3Use of energy by moving object
If direct electrical coupling is used between data conductor and pixel electrode, then capacitance is higher, but electrical connection is simpler
Solution Approach 1:
The shielding electrode acts as an intermediary that reduces parasitic capacitance between the data conductor and pixel electrode layer. By introducing this intermediate layer with controlled contact openings, the electrical field distribution is optimized, reducing unwanted capacitance effects while maintaining necessary electrical connection through the defined contact paths
Data Source
AI summary
A display device in accordance with some embodiments may include a substrate, a first interlayer insulating layer on the substrate, a data conductor on the first interlayer insulating layer, a passivation layer on the data conductor, a pixel electrode layer on the passivation layer, and a shielding electrode between the data conductor and the pixel electrode layer, and defining a first contact opening and a second contact opening, wherein the data conductor and the pixel electrode layer are electrically coupled to each other in each of the first contact opening and the second contact opening.