Multi-Layer Conductive Connection for Display Substrate
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Solution Overview
Problem
Conventional display substrates using Indium Tin Oxide (ITO) for conductive connections in common electrode circuits suffer from high resistivity, leading to signal loss and non-uniform voltage distribution, affecting the quality and uniformity of displayed images.
Innovation Solution
The use of conductive structures stacked in multiple layers as conductive connections between common electrodes and lines reduces resistance, employing materials like ITO for these structures to minimize voltage differences and enhance display uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Indium Tin Oxide (ITO) is used as the material of the conductive connection portion, then the conductive connection can be formed, but the high resistivity of ITO results in greater signal loss and larger voltage difference between common electrodes
Solution Approach 1:
The conductive connection portion uses a composite structure combining ITO layer and Alq3 organic material layer. The ITO provides basic conductivity and transparency, while the Alq3 layer with lithium dopant adds enhanced electrical conductivity. This composite material approach resolves the contradiction by maintaining the transparency advantage of ITO while compensating for its high resistivity through the conductive organic material layer.
Solution Approach 2:
The patent introduces lithium dopant into the Alq3 organic material to change its electrical parameters. The lithium ions act as charge carriers, significantly reducing the resistivity of the organic material layer. This parameter change enables the organic material to provide sufficient electrical conductivity for the common electrode connection, resolving the signal loss issue while maintaining the desired optical properties.
2Reliability
If Indium Tin Oxide (ITO) is used as the material of the conductive connection portion, then the conductive connection can be formed, but the high resistivity leads to larger voltage difference between common electrodes, affecting display uniformity
Solution Approach 1:
The composite conductive connection structure with ITO and doped Alq3 materials reduces the overall resistivity of the connection path. This lower resistance minimizes voltage drops across the common electrode connections, ensuring more uniform voltage distribution to all common electrodes, which directly improves display uniformity.
Solution Approach 2:
By doping Alq3 with lithium, the electrical conductivity parameter is significantly improved. This parameter change reduces the voltage difference between different common electrodes, ensuring uniform potential distribution across the display panel and eliminating display non-uniformity caused by voltage variations.
3Reliability
If a single-layer conductive structure is used, then the device complexity is low, but the resistance of the conductive connection portion is high
Solution Approach 1:
The conductive connection portion comprises multiple layers including ITO layer, Alq3 organic material layer, and lithium dopant. This multi-layer composite structure achieves superior electrical conductivity compared to single-layer designs. The layered structure allows each material to contribute its strengths: ITO for transparency and basic conductivity, Alq3 for conductivity enhancement, and lithium for charge carrier provision.
Solution Approach 2:
The patent transitions from a single-layer planar structure to a multi-layer vertical structure. By stacking different functional layers (ITO, Alq3, lithium dopant), the conductive connection achieves enhanced electrical properties in the vertical dimension while maintaining planar integration. This dimensional approach allows complex functionality to be achieved without increasing lateral footprint or overall device complexity.
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 approach reduces signal loss and improves the uniformity of common voltage across the display substrate, leading to better image quality by minimizing resistance and voltage differences between electrodes.
Implementation Method 1
the conductive connection portion includes conductive structures stacked on top of one another in a plurality of layers... the resistance of the conductive connection portion can be reduced, and therefore the resistance between the common electrode and the common electrode line can be reduced
Data Source
AI summary
The present disclosure provides a display substrate, a display panel and a display apparatus, belonging to the field of display technology. The display substrate includes a base, a plurality of common electrodes and a plurality of common electrode lines, the common electrodes are distributed on the base in an array, the common electrode lines extend along a row direction, and each common electrode line is connected to a corresponding row of common electrodes. The common electrode line is connected to the common electrode through a conductive connection portion, and the conductive connection portion includes conductive structures stacked on top of one another in a plurality of layers. The display substrate can reduce the resistance between the common electrode and the common electrode line, thereby reducing the voltage difference between the common electrodes in the display substrate and improving the uniformity of the common voltage therein.