LCD Gate Driver Output Transistor With Boosting Capacitor
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Solution Overview
Problem
As LCD devices increase in size, the lengthening gate lines result in increased line resistance, leading to slower response times due to reduced charging rates of thin film transistors, and parasitic capacities affect the gate signal output, deteriorating liquid crystal response time.
Innovation Solution
The LCD device incorporates a gate driver with shift registers that include an output transistor with a top electrode connected to the gate electrode, enhancing the boosted voltage on a first node through an additional capacitor component, which improves the response time by rapidly applying the gate scan signal to the gate lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the LCD device size is increased, then the display area is enlarged, but the gate line length increases causing line resistance to increase and response time to slow down
Solution Approach 1:
The gate driver is divided into multiple shift registers that operate in stages, with each shift register responsible for driving a portion of the gate lines. This segmentation allows the gate signals to be generated and distributed more efficiently, reducing the impact of line resistance even in large-sized displays.
2Area of stationary object
If the gate line length is increased, then the display area is enlarged, but the line resistance increases reducing the charging rate of thin film transistors
Solution Approach 1:
The output transistor is designed with a top electrode connected to the gate electrode to preliminarily establish a capacitive structure that stores charge. This preliminary charge storage compensates for the voltage drop caused by line resistance, ensuring that sufficient charging current reaches the thin film transistors even in large-sized displays.
3Adaptability or versatility
If the output transistor is connected to multiple thin film transistors, then the gate driver can drive more pixels, but parasitic capacities increase affecting the gate signal output and deteriorating response time
Solution Approach 1:
The output transistor structure is modified by adding a top electrode connected to the gate electrode, which changes the electrical parameters of the transistor. This structural parameter change creates an additional capacitor component that compensates for the parasitic capacities, maintaining fast response time while driving multiple thin film transistors.
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 configuration enhances the response time of the output transistor, allowing for faster turned-on/off times of the thin film transistors, thereby improving the liquid crystal response time and overall display performance.
Implementation Method 1
The output transistor includes a top electrode disposed on a uppermost layer and connected to the gate electrode. This configuration enhances the boosted voltage on a first node through an additional capacitor component.
Data Source
AI summary
The liquid crystal display device includes an output portion which is configured to include an output transistor having a large capacitor component. The output portion includes a top electrode which is configured to include an output transistor having a large capacitor component. As such, the liquid crystal display device can enhance the response speed of liquid crystal.