OLED Cathode Signal Layout for Uniform Display Panels
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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 and coupled to the cathode layer at gaps between adjacent organic functional layer patterns, with multiple sub-areas of non-overlapping projections, reducing equivalent resistance and enhancing contact area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a cathode signal line is arranged on a certain side of the display panel to transmit the cathode signal, then the cathode signal can be provided to the cathode layer, but the resistance of the cathode signal line causes significant IR drop at positions far from the signal source, resulting in poor display uniformity
Solution Approach 1:
The invention divides the cathode signal line into multiple segments arranged at different positions on the base substrate. Instead of using a single long signal line from one corner, multiple signal lines are distributed across the display panel, each serving a specific region. This segmentation reduces the length and resistance of each individual signal line, thereby minimizing IR drop and improving display uniformity across the entire panel.
Solution Approach 2:
The invention transitions from a one-dimensional arrangement where the cathode signal line is confined to a single side of the display panel to a two-dimensional distribution pattern. The signal lines are arranged in multiple rows and columns across the base substrate, utilizing the available space more effectively. This dimensional expansion reduces the distance between the signal source and various regions of the cathode layer, reducing resistance and IR drop.
2Object-affected harmful factors
If the cathode signal line is arranged in the non-display area, then the signal line does not affect the display effect, but the contact area with the cathode layer is limited
Solution Approach 1:
The cathode signal line is segmented into multiple contact points distributed across the non-display area. Each segment contacts the cathode layer at a specific location, collectively providing sufficient contact area without extending into the display area. This segmented approach maintains display quality while ensuring adequate electrical connection.
Solution Approach 2:
The signal line configuration utilizes the non-display area specifically for electrical connection purposes, while the display area maintains its optical quality. The local arrangement of signal lines in the non-display area provides necessary contact area without compromising the display region, as the signal lines are positioned where they will not be visible or interfere with light emission.
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 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; the organic functional layer includes a plurality of organic functional layer patterns disconnected with each other; and the cathode signal line is coupled to the cathode layer at a gap between two adjacent organic functional layer patterns.