Display Cathode Contact Protection for Uniform Large-Panel Voltage
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Solution Overview
Problem
As the size of light emitting display panels increases, there is a growing need for uniform cathode voltages across all areas, which existing technologies struggle to achieve effectively.
Innovation Solution
A light emitting display apparatus is designed with a fluorine-based protective layer wrapping the contact-area light emitting layer in the contact hole where the cathode and auxiliary electrode are connected, ensuring uniform voltage distribution and moisture protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the display panel size is increased to meet market demand for larger screens, then the display area and visibility are improved, but voltage uniformity across the cathode deteriorates due to longer current paths and greater area variations
Solution Approach 1:
The cathode is divided into multiple segments with different thicknesses corresponding to different display areas. The first cathode portion has a first thickness for a first display area, while the second cathode portion has a second thickness for a second display area. This segmentation allows each portion to be optimized for its specific area, maintaining voltage uniformity across the entire large display panel.
Solution Approach 2:
Different regions of the cathode are given different local properties through varying thickness. The cathode structure transitions from a uniform design to a non-uniform design where thickness is locally adjusted based on the specific display area requirements, enabling optimal electrical performance in each region.
2Ease of manufacture
If conventional protective layers are used without fluorine-based materials, then manufacturing simplicity is maintained, but moisture protection effectiveness deteriorates leading to reduced device reliability
Solution Approach 1:
The protective layer is formed using fluorine-based organic compounds that provide superior moisture barrier properties. This composite material approach combines the benefits of organic material flexibility with the exceptional moisture resistance of fluorine-based compounds, enhancing device reliability while maintaining manufacturing feasibility.
Data Source
AI summary
A light emitting display apparatus includes a substrate including a display area and a non-display area, a light emitting layer provided in a pixel in the display area, a cathode on the light emitting layer, and an auxiliary electrode connected to the cathode through a contact hole in the pixel, and a fluorine-based protective layer that covers an upper surface, a lower surface, and a side surface of a contact-area light emitting layer that is in the contact hole.