Source-Drain Electrode Patterning for Higher TFT Conductivity
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Solution Overview
Problem
The conductivity of source-drain electrodes in existing TFT display screens is relatively low, affecting the performance of array substrates by increasing charging and discharging time, which in turn impacts the refresh rate and overall performance of the display.
Innovation Solution
A method involving electrochemical deposition of a metal layer and a barrier layer on a patterned photoresist layer to form a source-drain electrode, using copper as the metal layer and molybdenum or titanium as the barrier layer, to enhance conductivity and reduce the RC time of the array substrate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional etching method is used to form source-drain electrode, then manufacturing process is simple, but conductivity is low
Solution Approach 1:
The patent replaces the traditional mechanical/chemical etching process with an electrochemical deposition process. Instead of removing material through etching, the invention deposits functional materials (metal layer and barrier layer) through electrochemical reactions, fundamentally changing the manufacturing approach to achieve higher conductivity while maintaining patternability.
Solution Approach 2:
The invention changes the deposition parameters by using electrochemical deposition with controlled voltage, current density, and electrolyte composition. This allows precise control over the thickness, composition, and microstructure of the deposited layers, optimizing conductivity while managing process complexity through parameter optimization.
2Loss of time
If source-drain electrode with low conductivity is used, then manufacturing cost is low, but charging and discharging time increases
Solution Approach 1:
The patent employs a composite structure consisting of multiple layers: conductive layer, metal layer, barrier layer, and optional second metal layer. This composite structure combines materials with different properties - the metal layer (copper, aluminum, or silver) provides high conductivity, while the barrier layer (titanium nitride, tungsten, or molybdenum) prevents diffusion and oxidation, achieving both low charging/discharging time and manufacturing feasibility.
Solution Approach 2:
The invention performs preliminary actions by depositing the barrier layer either before or after the metal layer in a controlled sequence. This preliminary structuring prevents unwanted material diffusion and oxidation during subsequent processing steps, ensuring long-term conductivity stability and reducing charging/discharging time without compromising reliability.
3Manufacturing precision
If photoresist layer is patterned with grooves, then electrochemical deposition precision is improved, but manufacturing steps increase
Solution Approach 1:
The patent uses the photoresist layer with grooves as an intermediary template during electrochemical deposition. The grooves guide the deposition process, ensuring precise pattern formation. After deposition, the photoresist is removed, having served its purpose as a temporary structuring element. This intermediary approach enables high precision without permanently increasing device complexity.
Solution Approach 2:
The invention segments the manufacturing process into distinct steps: photoresist coating, exposure, development to form grooves, electrochemical deposition, and photoresist removal. This segmentation allows each step to be optimized independently, achieving high pattern accuracy while managing overall process complexity through systematic breakdown of operations.
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 method improves the conductivity of the source-drain electrode, shortening the charging and discharging time of the array substrate, increasing the refresh rate, and enhancing the overall performance of the display mechanism.
Implementation Method 1
exposing and then developing the photoresist layer to form grooves passing through the photoresist layer on the photoresist layer
Implementation Method 2
electrochemically depositing a functional material on the patterned photoresist layer
Data Source
AI summary
The present disclosure relates to a source-drain electrode and a method for manufacturing the same, an array substrate and a method for manufacturing the same, and a display mechanism. A method for manufacturing a source-drain electrode includes steps of: disposing a conductive layer on an underlay; forming a photoresist layer on a side of the conductive layer away from the underlay; exposing and then developing the photoresist layer to form grooves passing through the photoresist layer on the photoresist layer, so as to form a patterned photoresist layer; and electrochemically depositing a functional material on the patterned photoresist layer and then removing the photoresist layer to obtain the conductive layer on which a patterned layer is formed, so as to obtain the source-drain electrode. The source-drain electrode manufactured by the above method has a higher conductivity.