GOA Circuit Voltage Stabilization for Touch Panel Scanning
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Solution Overview
Problem
The GOA circuit in liquid crystal display panels experiences insufficient circuit maintenance capability, leading to potential failures in cascaded transmission and display abnormalities due to non-continuous scanning during touch panel operations.
Innovation Solution
A GOA circuit with cascaded structural units, including a forward-reverse scan control module, node signal control input module, voltage-stabilizing module, node pull-down modules, gate signal pull-down module, and a GAS signal function module, with specific TFT configurations to manage scanning signals and potentials, ensuring stable operation by preventing charge leakage during non-scanning periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the GOA circuit performs touch scanning within a keeping time and suspends display scanning, then touch panel operation is enabled, but circuit maintenance capability becomes insufficient and cascaded transmission may fail
Solution Approach 1:
The patent applies preliminary action by pre-charging the first node Q(N) to a high-level potential VGH before the suspending period begins. The voltage-stabilizing module is configured to maintain this potential during the keeping time when touch scanning occurs but display scanning is suspended, ensuring the circuit is ready for resumption without degradation.
Solution Approach 2:
The voltage-stabilizing module acts as an intermediary between the signal output module and the GOA structural units. It mediates the potential at node Q(N) by preventing charge leakage through controlled TFT configurations, isolating the circuit from the harmful effects of the suspending period while enabling touch panel operation.
2Adaptability or versatility
If the GOA circuit is in the keeping status during touch scanning, then touch panel function is maintained, but charge leakage occurs and circuit stability deteriorates
Solution Approach 1:
The circuit performs preliminary charging of node Q(N) to VGH before the suspending period. This pre-established potential is maintained throughout the touch scanning interval, preventing charge leakage and ensuring stable operation when display scanning resumes.
Solution Approach 2:
The voltage-stabilizing module implements feedback control by continuously monitoring and maintaining the potential at node Q(N). The TFT configurations create a feedback mechanism that detects potential drops and compensates by preventing charge leakage, ensuring stable circuit composition during the keeping status.
3Reliability
If conventional COF technique is used for gate driving, then circuit functionality is achieved, but manufacturing cost increases and production performance decreases
Solution Approach 1:
The patent merges the gate driving circuit with the display panel array substrate by forming the GOA circuit directly on the same substrate using the thin film transistor array process. This integration eliminates the separate COF component and its associated bonding processes, reducing manufacturing steps and improving production efficiency while maintaining full gate driving functionality.
Solution Approach 2:
The GOA circuit serves itself by being self-contained on the array substrate, eliminating the need for external COF components. The circuit generates and maintains its own scanning signals through integrated transistor structures, removing dependency on separate driving components and simplifying the manufacturing process.
Data Source
AI summary
A GOA circuit comprises a plurality of GOA structural units connected in cascade, and each GOA structural unit outputs a line scanning signal to a corresponding one line of pixel units. An Nth stage GOA structural unit comprises a forward-reverse scan control module, a node signal control input module, an output control module, a voltage-stabilizing module, a node Q pull-down module, a node P pull-down module, a gate signal pull-down module, a GAS signal function module and a self-lifting capacitor. A gate of a first TFT of the voltage-stabilizing module receives a third GAS signal, a source thereof is connected to the forward-reverse scan control module and the node Q pull-down module, and a drain thereof is connected to the first node. The third GAS signal is VGH signal during the scan period of the touch panel, and is a VGL signal in a suspending period of the touch panel.