Shift Register Filter Circuit for GOA Noise Reduction
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Solution Overview
Problem
The reliability of Gate-Driving-On-Array (GOA) substrates in display panels is compromised due to noise and instability in shift registers, affecting the overall performance and longevity of the display panels.
Innovation Solution
A shift register design incorporating an input circuit, reset circuit, output circuit, pull-up and pull-down circuits, storage circuits, and a filter circuit, which filters and stabilizes voltage to reduce noise and enhance stability, comprising transistors and capacitors connected in specific configurations to manage input, clock, and power signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional shift register design is used in GOA substrate, then the device complexity is reduced and manufacturing is easier, but noise increases and reliability deteriorates
Solution Approach 1:
The shift register circuit is segmented into multiple functional modules: input circuit, output circuit, pull-up circuit, pull-down circuit, and filter circuit. Each module performs a specific function, allowing the complex reliability improvement to be achieved through modular design without overwhelming complexity increase.
Solution Approach 2:
A filter circuit is introduced as an intermediary component between the pull-down circuit and the output. This filter circuit specifically targets and eliminates noise signals, acting as a mediator that improves reliability by removing harmful noise without requiring complete redesign of the entire shift register.
2Stability of the object's composition
If noise filtering components are added to the shift register, then noise is reduced and stability is improved, but the device complexity increases
Solution Approach 1:
The filter circuit serves as an intermediary component that specifically addresses voltage stability by filtering noise. It is strategically placed in the signal path to provide stabilization without requiring fundamental changes to the core shift register operation, thus improving stability with controlled complexity increase.
Solution Approach 2:
The filter circuit is applied locally at the critical point where noise affects the output signal, rather than throughout the entire circuit. This localized approach to noise filtering provides voltage stability improvement while minimizing the overall complexity increase to only the specific region where it is most needed.
3Reliability
If multiple pull-down circuits and filter circuits are incorporated, then noise is reduced and reliability is improved, but the manufacturing precision requirements increase
Solution Approach 1:
The circuit is divided into distinct functional segments with clear boundaries and defined interfaces. Each segment (input, output, pull-up, pull-down, filter) can be designed and fabricated as a modular unit, which helps manage manufacturing precision requirements by allowing standardized fabrication processes for each segment.
Solution Approach 2:
The filter circuit parameters (such as capacitance and resistance values) are optimized to provide effective noise filtering while maintaining compatibility with standard fabrication processes. By carefully selecting parameter values that work within existing manufacturing capabilities, the design achieves improved reliability without excessively tightening precision requirements.
Data Source
AI summary
A shift register, a gate driving circuit, a display panel and a driving method. The shift register includes an input circuit, an output circuit, a pull-up node pull-down circuit, a first pull-down circuit of a first pull-down node, an output pull-down circuit, a pull-up circuit of the first pull-down node and a filter circuit. The filter circuit is connected with the first pull-down node, a second pull-down node, a first power terminal and a second power terminal respectively, and is configured to filter a voltage of the first pull-down node and transmit the filtered voltage to the second pull-down node.