Display Panel Ground Trace Layout for Static Charge Drainage
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Solution Overview
Problem
Existing display panels face issues with static electricity accumulation on the surface of the cover plate leading to negative electric fields that affect display performance, particularly causing greenish screen illumination due to biased threshold voltage of transistors.
Innovation Solution
The display panel incorporates a peripheral area with a second ground trace that leads out induced charges, including an outer and inner ring trace design with apertures and connection traces, along with anti-static capacitors and transistors to block electrostatic conduction paths and manage static electricity effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional display panel structure is used, then the manufacturing process is simple, but static electricity accumulates on the cover plate surface causing negative electric fields that affect display performance
Solution Approach 1:
The ground trace is divided into multiple segments (first ground trace, second ground trace, auxiliary ground trace) positioned at different locations and orientations around the active area. This segmentation allows the electrostatic conduction path to be blocked more effectively by creating multiple isolation barriers, while each individual trace segment remains manageable in complexity
Solution Approach 2:
The peripheral area structures (ground traces, isolation dams, auxiliary ground trace) act as intermediary elements between the active area and the edge area. These intermediaries block the direct conduction path of static electricity from the cover plate to the transistor regions, protecting the display performance without requiring fundamental changes to the overall panel structure
2Object-affected harmful factors
If ground traces are added to block electrostatic conduction paths, then static electricity management improves, but the peripheral area complexity increases
Solution Approach 1:
Different ground trace structures are applied in different local regions: the first ground trace is positioned close to the active area with specific width, the second ground trace is in the edge area with different dimensions, and the auxiliary ground trace connects them. Each local structure is optimized for its specific function and position, allowing effective electrostatic blocking without uniformly increasing complexity across the entire peripheral area
Solution Approach 2:
The ground trace system extends into the peripheral area dimension, utilizing the space between the active area and the panel edges. By arranging traces in different layers and positions (first ground trace near active area, second ground trace near edge area, auxiliary ground trace connecting them), the solution blocks electrostatic paths in three-dimensional space without significantly increasing the footprint of the active display region
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 negative electric fields, preventing static electricity accumulation and improving display panel illumination by blocking electrostatic conduction paths and managing induced charges, thereby enhancing display performance.
Implementation Method 1
static electricity accumulation on the surface of the cover plate leading to negative electric fields
Implementation Method 2
a second ground trace that leads out induced charges
Implementation Method 3
an isolation dam, a first ground trace and a second ground trace arranged on the base substrate
Data Source
AI summary
A display panel, including an active area and a peripheral area, which is located outside of the active area, wherein the active area comprises a base substrate, and a display structure layer and a touch structure layer sequentially arranged on the base substrate; the peripheral area includes an isolation dam, a first ground trace and a second ground trace arranged on the base substrate; and the first ground trace is located at a side of the isolation dam close to the active area, and the second ground trace is located at a side of the isolation dam away from the active area.