Electroluminescence Display Planarizing Structure Wiring Resistance
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Solution Overview
Problem
In electroluminescence display apparatuses, the close spacing of wiring lines increases resistance and the outgassing of gases from planarizing layers can lead to pixel shrinkage defects due to cathode oxidation.
Innovation Solution
Implementing a double-layered planarizing structure in the display area to maintain wiring line intervals and reduce resistance, while using a single layer in non-display areas to minimize gas outgassing and prevent cathode oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If the volume of the planarizing layer in the non-display area is increased to provide additional space for wiring lines, then the wiring line interval is improved, but the amount of gas outgassed from the planarizing layer increases, leading to cathode oxidation and pixel shrinkage defects
Solution Approach 1:
The planarizing layer is segmented into two separate layers: a first planarizing layer and a second planarizing layer. The first planarizing layer is disposed in the non-display area with larger volume to provide wiring space, while the second planarizing layer is disposed in the display area with smaller volume to minimize gas outgassing that could reach the cathode. This segmentation allows each layer to serve its specific function without causing harmful effects.
Solution Approach 2:
Different regions of the display device are assigned different planarizing layer configurations: the non-display area receives a first planarizing layer with sufficient volume for wiring accommodation, while the display area receives a second planarizing layer with controlled volume to prevent gas outgassing issues. This local differentiation optimizes each region's specific requirements.
2Reliability
If a double-layered planarizing structure is applied in the display area to maintain wiring line intervals, then wiring resistance is reduced, but the complexity of the device structure increases
Solution Approach 1:
The planarizing function is segmented into two distinct layers with different configurations: the first planarizing layer handles wiring space requirements in the non-display area, while the second planarizing layer handles the display area requirements. This segmentation allows optimization of wiring intervals without uniformly increasing complexity across the entire device.
Solution Approach 2:
The double-layered planarizing structure is applied selectively: the first planarizing layer is used in the non-display area where wiring space is needed, while the second planarizing layer is used in the display area where gas outgassing must be minimized. This localized application reduces overall device complexity compared to a uniform double-layer structure.
Data Source
AI summary
An electroluminescence display apparatus includes a substrate including a display area and a non-display area. The non-display area includes a bending area and a link area. A first power supply electrode is in the link area. A second power supply electrode is in the non-display area. The second power supply electrode surrounds at least three sides of the display area, and both ends of the second power supply electrode in the link area. A protective layer covers the first power supply electrode and the second power supply electrode in the link area. A first planarizing layer covers one side of the first power supply electrode; and a second planarizing layer is on a contact hole of the protective layer that exposes the first power supply electrode and the second power supply electrode. The first planarizing layer is not on the contact hole.