OLED Cathode Signal Line Segmentation for Display Uniformity
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Solution Overview
Problem
OLED display panels experience poor display uniformity due to significant voltage differences across the cathode layer caused by high resistance in the cathode signal line, leading to IR drops at positions far from the signal source.
Innovation Solution
The cathode signal line is arranged in the non-display area with multiple separated sub-areas, coupled to the cathode layer through via holes, and can be implemented in various configurations to reduce equivalent resistance and ensure uniform signal distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a cathode signal line is arranged on a certain side of the display panel to transmit the cathode signal, then the structure is simple and easy to manufacture, but the resistance of the cathode signal line causes great IR drop at positions far from the signal source, resulting in poor display uniformity
Solution Approach 1:
The cathode signal line is divided into multiple segments arranged in different sub-areas of the non-display area. Instead of a single long signal line, multiple separate signal lines are used to contact the cathode layer at different positions, reducing the equivalent resistance and IR drop while maintaining manufacturing simplicity
Solution Approach 2:
The cathode signal line arrangement transitions from a one-dimensional linear arrangement on one side to a two-dimensional distributed arrangement across multiple sub-areas in the non-display area. This spatial redistribution reduces the distance and resistance between the signal source and different regions of the cathode layer, improving display uniformity
2Reliability
If the cathode signal line is extended to reach distant positions on the cathode layer, then the signal can be transmitted to all areas, but the resistance increases causing greater IR drop and voltage differences
Solution Approach 1:
The cathode signal line is segmented into multiple shorter lines distributed across different sub-areas. Each segment has lower resistance individually, and together they provide comprehensive signal coverage without the cumulative resistance problem of a single extended line, reducing IR drop while ensuring reliable signal transmission
Solution Approach 2:
Different regions of the non-display area are utilized to place cathode signal line segments strategically. This local distribution optimizes the proximity between signal lines and cathode layer contact points in different regions, minimizing local resistance and IR drop variations while ensuring uniform signal transmission across the entire cathode layer
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 reduces IR drops and enhances display uniformity by enlarging the contact area between the cathode signal line and the cathode layer, improving the overall display quality.
Implementation Method 1
due to resistance of the cathode signal line and a cathode layer, an IR drop of the cathode signal at a position far from the signal source is great
Data Source
AI summary
Disclosed are a display panel and a display apparatus. The display panel includes: a base substrate, an anode layer, a cathode layer, an organic functional layer and cathode signal lines, wherein the anode layer is located on the base substrate; the cathode layer is located on the side of the anode layer that faces away from the base substrate, and the orthographic projection of the cathode layer on the base substrate overlaps with both a display area and a non-display area; the organic functional layer is located between the anode layer and the cathode layer, and the orthographic projection of the organic functional layer on the base substrate overlaps with the display area; the cathode signal lines are located on the side of the organic functional layer that is close to the base substrate, and the cathode signal lines are located in the non-display area.