| 摘要 |
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. |
| 主权项 |
1. A gate driver on array (GOA) circuit for in-cell type touch display panel, which comprises: a plurality of cascade GOA units, N being a positive integer, the N-th stage GOA unit further comprising: a forward and backward scan control module, a first node pull-down control module, a second node control module, a second node reset module, a stop-duration output control module, a black-screen-duration output control module, and a normal-display-duration output control module;
the black-screen-duration output control module further comprising: a thirteenth N-type thin film transistor (TFT); a gate and a source of the thirteenth N-type TFT both connected to a first global control signal, and a drain being connected to a scan output end; the first global control signal providing a constant positive voltage during black screen duration to make the thirteenth N-type TFT of GOA unit of each stage conductive so that the scan driving signals of each stage being raised to a high level voltage; the second node control module further comprising: a twelfth N-type TFT; a gate of the twelfth N-type TFT being connected to the first global control signal, a source connected to a negative voltage and a drain connected to a second node; during black screen duration, the twelfth N-type TFT of GOA unit of each stage being controlled by the first global control signal to become conductive, and the negative voltage providing a constant negative voltage during the black screen duration to pull down the voltage level of the second node; the second node reset module further comprising: a fourteenth N-type TFT; a gate and a source of the fourteenth N-type TFT being connected to a reset signal, a drain being connected to the second node; the reset signal providing a single positive voltage pulse signal when awakening from the black screen duration to make the fourteenth N-type TFT of GOA unit of each stage conductive so that the second node of GOA unit of each stage being reset to the high level; the stop-duration output control module further comprising: a fifteenth N-type TFT, a gate of the fifteenth N-type TFT connected to a second global control signal, a source connected to the negative voltage, and a drain being connected to the scan output end; the second global control signal providing a constant positive voltage during the stop duration to make the fifteenth N-type TFT of GOA unit of each stage conductive; the negative voltage providing a pulse signal the same as a touch signal in amplitude, phase and frequency during the stop duration so as to reduce the cross-talk between the touch signal and the scan output end. |
