GOA Scanning-Driving Circuit Stability During Backward Scanning
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Solution Overview
Problem
Conventional liquid crystal display devices with Gate Driver On Array (GOA) scanning-driving circuits face instability, particularly during backward scanning, due to competitive balance issues between thin film transistors, leading to failure in maintaining a stable voltage level for the pull-down control signal node.
Innovation Solution
A scanning-driving circuit with a forward-backward scanning module, pull-up holding module, input module, control module, and output module, utilizing controllable switches and capacitors to manage clock signals and scanning signals, ensuring stable voltage levels and preventing electric leakage, thereby stabilizing the scanning-driving circuit operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a conventional GOA scanning-driving circuit is used, then the circuit can be formed on the array substrate by conventional manufacturing processes, but the circuit becomes unstable during backward scanning due to competitive balance issues between thin film transistors
Solution Approach 1:
The scanning-driving circuit is divided into multiple functional modules: a forward-backward scanning module that generates scanning signals in both directions, a pull-up holding module that maintains voltage levels, an input module that receives clock signals, a control module that coordinates operations, and an output module that drives the scanning line. This segmentation allows each module to be optimized independently, solving the instability issue while maintaining compatibility with conventional manufacturing processes
Solution Approach 2:
The pull-up holding module acts as an intermediary between the forward-backward scanning module and the output module. It receives the selecting signal from the scanning module and actively maintains the voltage level of the pull-up control signal node, preventing the competitive balance issues that cause instability in conventional circuits. This intermediary component ensures stable operation during both forward and backward scanning
2Ease of manufacture
If thin film transistors are used in the scanning-driving circuit, then the circuit can be manufactured with conventional processes, but the circuit fails to maintain stable voltage levels during backward scanning
Solution Approach 1:
The pull-up holding module performs preliminary action by proactively maintaining the voltage level of the pull-up control signal node before instability can occur. It receives the selecting signal in advance and prepares the voltage level, preventing the competitive balance issues that would otherwise cause failure during backward scanning. This preliminary voltage stabilization works effectively with thin film transistors manufactured by conventional processes
Data Source
AI summary
A scanning-driving circuit and a liquid crystal display device are disclosed. The scanning-driving circuit has a forward-backward scanning module to output a forward and backward scanning-driving signals; a pull-up holding module connected to the forward-backward scanning module to receive a selecting signal of the forward-backward scanning module and to pull up a voltage level of a pull-down control signal node; an input module connected to the forward-backward scanning module and the pull-up holding module to receive a previous-stage clock signal and to charge a pull-up control signal node; a control module connected to the pull-up holding module to receive a present-stage clock signal and to control the pull-up holding module; an output module connected to the pull-up holding module and the control module to output a scanning-driving signal to a scanning line, and to transmit the scanning-driving signal to a pixel unit to ensure a stability of the scanning-driving circuit.