Display Electrode Layout With Dummy Barrier Against Dark Spots
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Solution Overview
Problem
Display devices face issues with particle penetration into pixel electrodes leading to galvanic reactions, causing dark spots and short circuits, which deteriorate image quality, and are exacerbated by potential differences with adjacent electrodes.
Innovation Solution
A display device structure is designed with a substrate having emission and non-emission areas, specific electrode configurations, and a dummy electrode to prevent particle penetration and reduce galvanic reactions, including a cross-sectional area greater than the connection electrode to minimize contact with the pixel electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If particles penetrate into pixel electrodes electrically connected to light emitting elements, then galvanic reactions occur causing dark spots and short circuits, but reducing particle penetration requires additional structural measures
Solution Approach 1:
A dummy electrode is introduced as an intermediary component between the first connection electrode and the first pixel electrode. This dummy electrode serves as a barrier that prevents particles from directly reaching the pixel electrode, thereby reducing galvanic reactions and improving image quality without fundamentally changing the basic electrode structure.
Solution Approach 2:
The first connection electrode is segmented into two distinct parts: the first connection electrode and the dummy electrode. This segmentation allows the dummy electrode to specifically target particle prevention while the first connection electrode maintains its electrical connection function, resolving the contradiction between reliability and structural complexity.
2Reliability
If the pixel electrode has a lower potential than adjacent electrodes, then galvanic reaction is accelerated causing dark spots, but increasing potential difference is necessary for device operation
Solution Approach 1:
The dummy electrode acts as an intermediary that physically blocks particles from reaching the pixel electrode, thereby preventing galvanic reactions even when potential differences exist between adjacent electrodes. This allows the device to maintain necessary power levels while improving reliability against galvanic corrosion.
3Reliability
If the dummy electrode has a larger cross-sectional area than the connection electrode, then particle penetration is reduced, but material usage and manufacturing complexity increase
Solution Approach 1:
The dummy electrode's cross-sectional area is optimized to be larger than the first connection electrode, creating an effective barrier against particle penetration. This parameter change enhances reliability by blocking particles more effectively, while the increase in material usage remains manageable within manufacturing constraints.
Data Source
AI summary
A display device includes a substrate including an emission area and a non-emission area, a first connection electrode provided on the substrate and electrically connected to a first driving power, a second connection electrode provided to be spaced apart from the first connection electrode in a first direction and electrically connected to a second driving power, a dummy electrode provided to be spaced apart from the first connection electrode in a second direction intersecting the first direction, light emitting elements provided between the second connection electrode and the dummy electrode in a plan view and forming the emission area, a first pixel electrode provided on the first and second connection electrodes and electrically connected to the first connection electrode, and a second pixel electrode provided on the first and second connection electrodes and electrically connected to the second connection electrode.