GOA Circuit for In-Cell Touch Display Panels
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Solution Overview
Problem
Current gate driver on array (GOA) circuits for in-cell type touch display panels face challenges in achieving stable all-gate-on and signal stop functions, leading to potential electricity leakage and cross-talk between touch and scan driving signals.
Innovation Solution
A GOA circuit design comprising multiple stages with specific TFT configurations and control modules, including forward and backward scan control, node pull-down, reset, and stop-duration output control, utilizing global control signals and TFTs to manage voltage levels and signal phases during black screen, normal display, and touch detection durations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the all-gate-on function is implemented in the current single-type GOA circuit, then the scan driving signals can be raised to high level during black screen duration, but the function may not stay in effecting and electricity leakage occurs
Solution Approach 1:
The patent divides the GOA circuit into multiple independent GOA units (first GOA unit, second GOA unit, etc.), each with its own all-gate-on control module. This segmentation allows each unit to independently control its scan output signals, preventing electricity leakage from affecting the entire circuit and improving the stability of the all-gate-on function.
Solution Approach 2:
The patent introduces a level shift module as an intermediary between the scan driving signal generation module and the scan output signals. This level shift module effectively isolates and controls the signal levels, preventing electricity leakage while maintaining the all-gate-on function stability.
2Adaptability or versatility
If the signal stop function is implemented in the current single-type GOA circuit, then the scan driving signals can be turned off for touch detection, but cross-talk between touch signal and scan driving signal occurs
Solution Approach 1:
The patent divides the GOA circuit into multiple independent GOA units, each capable of independent signal stop control. This segmentation allows the circuit to stop scan driving signals for touch detection without affecting other units, reducing cross-talk between touch signals and scan driving signals.
Solution Approach 2:
The patent implements preliminary anti-action by pre-configuring each GOA unit with independent control modules that can proactively stop scan driving signals before touch detection begins. This prevents cross-talk by ensuring scan signals are completely halted during touch detection periods.
3Adaptability or versatility
If multiple control modules and TFTs are added to achieve all-gate-on and signal stop functions, then circuit functionality is improved, but device complexity increases
Solution Approach 1:
The patent divides the complex control functionality into modular segments (scan driving signal generation module, level shift module, all-gate-on control module, stop control module, etc.). Each module performs a specific function, making the overall complex system manageable and maintainable while achieving advanced control capabilities.
Solution Approach 2:
The patent designs each GOA unit with multi-functional control modules that can perform multiple operations (scan driving, level shifting, all-gate-on control, signal stop) within a unified structure. This universality reduces overall circuit complexity by avoiding separate dedicated circuits for each function.
Data Source
AI summary
The invention discloses a GOA circuit for in-cell type touch display panel; during black screen, using a first global control signal to make a thirteenth N-type TFT conductive to raise a scan driving signal of each stage to high, using the first global control signal to make a twelfth N-type TFT conductive to pull down a voltage level of a second node, and pulling down a voltage level of a first node to avoid ineffective all-gate-on function; using a reset signal and a fourteenth N-type TFT to reset the second node to realize the normal output after awaking from black screen; during stop, setting a negative voltage as a pulse signal having same amplitude, phase and frequency as a touch signal, using a second global control signal to make the fifteenth N-type TFT conductive to output the negative voltage in pulse form to reduce cross-talk between the touch signal and a scan output end.