Segmented Cathode Electrode for Display Panel RC Load Reduction
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Solution Overview
Problem
High-resolution light emitting display panels experience image quality degradation due to increased resistance-capacitor load (RC Load) caused by parasitic capacitance between data lines and cathode electrodes, leading to reduced charge rates and picture quality issues.
Innovation Solution
The light emitting display panel design features a cathode electrode patterned to avoid overlap with data lines, using a bank structure to separate the cathode electrodes and reduce parasitic capacitance, thereby minimizing RC Load and maintaining image quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the light emitting display panel displays high resolution and reduces the number of masks, then the manufacturing complexity is reduced, but the resistance-capacitor load increases causing image quality degradation
Solution Approach 1:
The cathode electrode is divided into multiple segments (first cathode electrode and second cathode electrode) that are spatially separated. This segmentation reduces the overlapping area with data lines, thereby reducing parasitic capacitance and RC load while maintaining the simplified mask structure for high resolution manufacturing
2Ease of manufacture
If the cathode electrode is provided as a plate on the entire light emitting display panel, then the manufacturing process is simplified, but parasitic capacitance is generated between the cathode electrode and data lines increasing RC load
Solution Approach 1:
The cathode electrode is segmented into first and second cathode electrodes that are separated on the upper surface of the bank. This segmentation reduces the overlapping area with data lines while maintaining manufacturing simplicity through the bank structure that naturally separates the segments
Solution Approach 2:
The cathode electrode structure is made non-uniform by separating it into different regions (first and second cathode electrodes) in areas where data lines overlap with the bank. This local differentiation reduces parasitic capacitance specifically in critical areas while maintaining overall manufacturing ease
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 design effectively reduces the RC Load between data lines and cathode electrodes, enhancing image quality by preventing parasitic capacitance and maintaining charge rate, thus addressing the degradation issues in high-resolution displays.
Implementation Method 1
a parasitic capacitance is generated between a cathode electrode provided in the form of plate on the entire light emitting display panel and data lines provided along a first direction of the light emitting display panel
Data Source
AI summary
Disclosed is a light emitting display panel in which a portion overlapped with data lines is patterned in a cathode electrode, and a light emitting display apparatus using the same. The light emitting display panel comprises a substrate, a first signal line along a first direction of the substrate, a first insulating film covering the first signal line, a second insulating film covering the first insulating film, an anode electrode patterned by each pixel, a bank covering ends of the anode electrode, a first light emitting layer on the anode electrode disposed at a first side of the bank, a second light emitting layer on the anode electrode disposed at a second side of the bank, a first cathode electrode on the first light emitting layer, and a second cathode electrode on the second light emitting layer, wherein the first and second cathode electrodes are separated from each other on the upper surface of the bank.