OLED Panel Cathode Layout for Electrostatic Discharge Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The generation of electrostatic charges during the evaporation and transport of metal masks in organic light-emitting display panels leads to cathode breakdown, affecting display quality and reducing product yield.
Innovation Solution
The use of a single mask to form the cathode, with a zigzag edge segment for the second cathode, allows for easier electrostatic discharge and reduces the influence of electrostatic charges, improving display effect and yield.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a metal mask is used during the evaporation process of each film, then the evaporation material can be deposited to the corresponding positions of the light-emitting elements, but electrostatic charges are generated from friction during the evaporation and transport process of the metal mask, and the electrostatic charges stay in the nonconductive films, affecting the display quality
Solution Approach 1:
The display area is divided into a first display area and a second display area, with light-emitting elements in each area sharing a common cathode. This segmentation allows for separate handling of electrostatic discharge in different regions, reducing the overall impact of electrostatic charges on the display quality.
Solution Approach 2:
The patent introduces a zigzag edge segment design for the second cathode, which creates a preferred discharge path for electrostatic charges. By converting the harmful electrostatic charge accumulation into a controlled discharge mechanism through the zigzag structure, the patent eliminates the negative effects while maintaining the benefits of metal mask evaporation.
2Reliability
If electrostatic charges stay in the nonconductive films, then the display quality of the organic light-emitting display panel is affected during subsequent display and light emission
Solution Approach 1:
The zigzag edge segment of the second cathode acts as an intermediary structure that facilitates the discharge of electrostatic charges. This intermediate structure provides a controlled path for charge dissipation, preventing direct interference with the display quality while maintaining the integrity of the nonconductive films.
Solution Approach 2:
The patent designs the cathode structure with zigzag edge segments before the electrostatic charge accumulation occurs during the evaporation process. This preliminary structural design ensures that when electrostatic charges are generated, they automatically follow the predetermined discharge path through the zigzag edges, preventing subsequent display quality issues.
3Reliability
If multiple cathodes are used for different light-emitting element groups, then the electrostatic discharge is more difficult, but the display effect can be optimized
Solution Approach 1:
The patent merges the cathode structures by having light-emitting elements in the first display area and second display area share common cathodes. This merging reduces the total number of cathodes and simplifies the overall structure, while the zigzag edge segments provide the necessary electrostatic discharge pathways.
Solution Approach 2:
The shared cathodes serve multiple functions: they provide the necessary electrical connection for light-emitting elements in different display areas and simultaneously act as electrostatic discharge structures through their zigzag edge segments. This multi-functionality reduces device complexity while maintaining optimized display effects.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the display effect and reduces production costs by minimizing the impact of electrostatic charges on the cathode, while maintaining a high screen-to-body ratio and product yield.
Implementation Method 1
The second cathode has a zigzag edge segment. The at least one organic light-emitting unit in the same organic light-emitting unit group shares a second cathode. The zigzag edge segment configuration allows for easier electrostatic discharge and reduces the influence of electrostatic charges.
Data Source
AI summary
Provided are an organic light-emitting display panel and a display device. The organic light-emitting display panel includes: a plurality of organic light-emitting units, a first display area and a second display area. The plurality of organic light-emitting units includes first organic light-emitting units in the first display area and second organic light-emitting units in the second display area. The first organic light-emitting units share a first cathode. The second organic light-emitting units include at least one organic light-emitting unit group, each of the at least one organic light-emitting unit group includes at least one organic light-emitting unit. The at least one organic light-emitting unit in a same organic light-emitting unit group shares a second cathode. The second cathode has a zigzag edge segment.