Display Panel Common Electrode Segmentation for Parasitic Capacitance Reduction
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Solution Overview
Problem
In high-aperture ratio liquid crystal displays, the large overlapping area between data lines and common electrodes leads to significant parasitic capacitance, causing RC delay and a greenish phenomenon, which degrades display quality, especially as resolution increases.
Innovation Solution
The display panel design includes a first substrate with a first common electrode closer to the second substrate, where the orthographic projection of the second common electrode overlaps with data lines, while the first common electrode does not, reducing parasitic capacitance by increasing the distance between the data lines and common electrodes, and using conductive gold balls and spacers for electrical connection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the common electrode is placed close to the data line to simplify structure, then device complexity is reduced, but parasitic capacitance increases causing RC delay and greenish phenomenon
Solution Approach 1:
The common electrode is divided into two separate electrodes: a first common electrode on the first substrate and a second common electrode on the second substrate. This segmentation allows the data line to overlap with the second common electrode (reducing overall parasitic capacitance) while maintaining structural simplicity through the layered configuration.
Solution Approach 2:
The solution moves from a single-plane configuration to a three-dimensional layered structure. By placing the first common electrode closer to the data line in the vertical dimension (on the first substrate) while allowing the second common electrode to overlap in the horizontal projection (on the second substrate), the patent resolves the contradiction between structural simplicity and parasitic capacitance reduction.
2Stability of the object's composition
If the overlapping area between data lines and common electrode is increased to improve voltage distribution, then common voltage distribution is improved, but parasitic capacitance increases causing RC delay
Solution Approach 1:
By segmenting the common electrode into two parts on different substrates, the patent achieves both goals: the second common electrode's overlap with the data line improves voltage distribution uniformity, while the separated structure reduces parasitic capacitance and RC delay compared to a single large overlapping electrode.
Solution Approach 2:
The first common electrode acts as an intermediary between the data line and the second common electrode. It provides a intermediate connection point that helps distribute voltage uniformly while the separated substrate structure minimizes direct parasitic capacitance between the data line and the second common electrode.
3Object-generated harmful factors
If the distance between data line and common electrode is increased to reduce parasitic capacitance, then parasitic capacitance is reduced, but electrical connection complexity increases
Solution Approach 1:
The segmentation of the common electrode into two substrates naturally creates the distance needed to reduce parasitic capacitance. The electrical connection complexity is managed by using standard substrate bonding techniques and conductive fillers, which are conventional solutions that do not significantly increase overall device complexity.
Solution Approach 2:
The first common electrode serves as an intermediary connection element that simplifies the electrical connection between the data line and the second common electrode. Instead of requiring direct long-distance connections, the intermediary first common electrode provides a localized connection point on the first substrate.
Data Source
AI summary
A display panel, a method for manufacturing a display panel, and a display device are provided. The display panel includes a first substrate and a second substrate disposed opposite to each other. The first substrate is provided with a first common electrode and a pixel electrode disposed in different layers, and the first common electrode is closer to the second substrate comparing with the pixel electrode. The second substrate is provided with a second common electrode, and the second electrode is electrically connected to the first common electrode. An orthographic projection of the second common electrode on the first substrate has an overlapping area with data lines on the first substrate, and an orthographic projection of the first common electrode on the first substrate has no overlapping area with the data lines.