Shift Register Unit for GOA Circuit Stability
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Solution Overview
Problem
Current Gate Driver on Array (GOA) circuits experience poor driving stability due to competition between the pull-up and pull-down nodes, which affects the yield of display panels.
Innovation Solution
A shift register unit with specific sub-circuits and transistors is designed to manage the pull-up and pull-down nodes independently, using input, output, reset, and storage sub-circuits to prevent node interaction, along with an auxiliary pull-down sub-circuit and storage capacitors to enhance stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull-up node and pull-down node are used in the GOA circuit, then the basic switching function is achieved, but the nodes compete with each other causing poor driving stability
Solution Approach 1:
The circuit is divided into independent sub-circuits: input sub-circuit, output sub-circuit, first reset sub-circuit, second reset sub-circuit, pull-down sub-circuit, and spacing sub-circuit. Each sub-circuit manages specific nodes independently, preventing the competition between pull-up and pull-down nodes while maintaining the switching function.
Solution Approach 2:
The spacing sub-circuit acts as an intermediary between the pull-up node and pull-down node, controlling their interaction through timed signal transmission. This mediator prevents direct competition by ensuring nodes are activated in a controlled sequence rather than simultaneously.
2Productivity
If the GOA circuit uses a simplified structure, then the manufacturing cost is reduced, but the yield of display panels is affected due to node competition
Solution Approach 1:
By segmenting the circuit into functional sub-circuits, the patent achieves better control and stability which improves yield, while each sub-circuit remains relatively simple in structure. The segmentation allows independent optimization of each module without requiring a complete redesign of the entire circuit.
Solution Approach 2:
Different sub-circuits are designed with specific local functions: the input sub-circuit handles signal input, the spacing sub-circuit manages node timing, and the reset sub-circuits handle resetting. This local specialization improves overall circuit performance and yield without uniformly increasing complexity across the entire circuit.
3Speed
If the pull-up and pull-down nodes operate simultaneously, then the switching speed is maintained, but the competition between nodes reduces driving stability
Solution Approach 1:
The spacing sub-circuit introduces periodic control signals that activate the pull-up and pull-down nodes in alternating sequences rather than simultaneously. This periodic action maintains the overall switching speed by ensuring rapid alternation between states while preventing harmful simultaneous activation that would reduce stability.
Solution Approach 2:
The circuit design prepares the nodes in advance for their respective actions. The spacing sub-circuit pre-charges or pre-discharges nodes before their active switching phase, ensuring that when they do activate, they do so in a controlled manner that maintains speed without causing instability from simultaneous competition.
Data Source
AI summary
The present application provides a shift register unit including: an input sub-circuit coupled to an input terminal, an first voltage terminal and an pull-up node; an output sub-circuit coupled to the pull-up node and art first clock terminal; a first storage sub-circuit having two terminals respectively coupled to the pull-up node and an output terminal; a first reset sub-circuit coupled to an reset terminal, an second voltage terminal, the pull-up node and the output terminal; a second reset sub-circuit coupled to a second clock terminal and a pull-down node; a pull-down sub-circuit coupled to the pull-down node, the second voltage terminal and the output terminal; and a spacing sub-circuit coupled to the pull-up node, the pull-down node and the second voltage terminal. The present application further provides a driving method of a shift register unit, a gate driving circuit and a display device.