Shift Register Gate Driver Circuit Electrostatic Discharge Unit
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Solution Overview
Problem
The existing gate driver circuits on array (GOA) technology occupies significant area on display panels, limiting the display area, as they are directly fabricated on glass substrates and require large layout areas for pull-down transistors.
Innovation Solution
A shift register and gate driver circuit design that incorporates an electrostatic discharge unit to replace or reduce the need for pull-down transistors, utilizing a combination of input, output, and reset units to manage voltage and increase display area by effectively pulling down gate voltages, thereby reducing the layout area required for the pull-down transistor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a gate driver circuit is directly fabricated on a glass substrate using GOA technology, then the manufacturing cost is reduced, but the occupied area increases and limits the display area
Solution Approach 1:
The invention extracts the pull-down function from the traditional gate driver circuit and implements it through an electrostatic discharge unit. This separation allows the main gate driver circuit to be minimized while the electrostatic discharge unit handles the voltage pulling down task, thereby reducing the overall area occupied by the gate driver circuit on the glass substrate.
Solution Approach 2:
The invention changes the voltage parameter dynamically by using an electrostatic discharge unit that pulls down the voltage of the gate output terminal to a low gate voltage level. This parameter change enables more efficient use of the gate driver circuit area, as the circuit can operate with lower voltage levels during non-active periods, reducing the required transistor sizes and overall circuit footprint.
2Reliability
If a pull-down transistor is used in the gate driver circuit, then the voltage can be pulled down, but the layout area is increased
Solution Approach 1:
The electrostatic discharge unit serves multiple functions: it pulls down the voltage of the gate output terminal, it resets the bootstrap node voltage, and it enables the gate driver circuit to operate in a low-power state. By consolidating these functions into a single unit, the invention reduces the overall layout area compared to using separate pull-down transistors for each function.
Solution Approach 2:
The reset unit performs preliminary action by resetting the bootstrap node voltage before the electrostatic discharge unit pulls down the gate output terminal voltage. This sequence of operations ensures that the circuit is properly prepared for the voltage pulling down operation, maintaining reliability while optimizing the area usage through coordinated timing of operations.
Data Source
AI summary
A shift register and a gate driver circuit are provided. The shift register includes an input unit, an output unit, an electrostatic discharge unit and a reset unit. The input unit provides an input signal. The output unit is coupled to the input unit and a gate output terminal. The output unit outputs an output signal through the gate output terminal according to the input signal. The electrostatic discharge unit is coupled to the output unit. After the gate output terminal outputs the output signal, the electrostatic discharge unit pulls down a voltage of the gate output terminal according to a low gate voltage. The reset unit is coupled to the input unit and the output unit. After the electrostatic discharge unit pulls down the voltage of the gate output terminal, the reset unit resets a voltage of a bootstrap node.