Pixel Electrode Layout to Reduce Display Contact Resistance
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Solution Overview
Problem
Display devices face defects due to contact resistance and reactivity between electrodes, which affect the performance and reliability of the devices.
Innovation Solution
A display device design that includes a pixel structure with an emission area, a non-emission area, and a connection electrode electrically connected to the transistor through an opening area in the protective layer, minimizing contact resistance and reactivity by separating alignment electrodes from the connection electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If alignment electrodes and connection electrodes are in direct contact, then the device structure is simpler, but contact resistance increases and reactivity defects occur
Solution Approach 1:
The electrode system is segmented into alignment electrodes and connection electrodes as separate functional components. The alignment electrodes are positioned in the emission area for light emitting element alignment, while connection electrodes are positioned in the non-emission area for electrical connections, preventing direct contact and reducing contact resistance and reactivity defects.
Solution Approach 2:
The connection function is extracted from the alignment electrodes and assigned to separate connection electrodes. This extraction allows the alignment electrodes to focus solely on alignment without the additional complexity and potential defects of direct electrical contact, while connection electrodes handle electrical connections in the non-emission area.
2Ease of manufacture
If protective layer is fully removed for electrode connection, then electrical connection is easier, but device reliability decreases due to exposure
Solution Approach 1:
The protective layer is selectively removed only in the non-emission area where connection electrodes are positioned, while maintaining the protective layer in the emission area. This local quality approach enables electrical connections to be made through the opening area without compromising the overall protection of the light emitting elements in the emission area.
Data Source
AI summary
A display device and a method of manufacturing the same are provided. The display device includes a pixel including an emission area and a non-emission area, a transistor of the pixel, a protective layer on the transistor, and including an opening area overlapping the non-emission area, alignment electrodes on the protective layer and spaced apart from each other, light emitting elements between respective ones of the alignment electrodes in the emission area, and a connection electrode electrically connected to the light emitting elements, and electrically connected to the transistor in the opening area.