GOA Driving Circuit Pull-Down Module for Narrow Frame Displays
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Solution Overview
Problem
In narrow-frame display panels, the distal end of the gate signal line is connected in series with capacitive resistance loads, leading to undercharging of pixels, distortion of display images, and poor reliability due to waveform changes during signal transmission.
Innovation Solution
A driving circuit design that includes a pull-down module activated at the falling edge of the scan driving signal, connected to the control bus and gate signal line, to accelerate the potential descending speed and ensure the falling edge reaches a threshold voltage, thereby reducing waveform distortion and improving display quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the gate signal line is extended to the distal end of the display panel, then the display area is increased and frame is narrowed, but the signal line is connected in series with more capacitive resistance loads causing waveform distortion and pixel undercharging
Solution Approach 1:
A pull-down module is introduced as an intermediary component connected to the distal end of the gate signal line. This module actively pulls down the potential at the distal end during the falling edge of the scan driving signal, compensating for the waveform distortion caused by the long signal line and capacitive resistance loads, thereby ensuring reliable signal transmission to distant pixels
Solution Approach 2:
The pull-down module dynamically changes the potential parameter at the distal end of the gate signal line by activating the pull-down transistor during the falling edge period. This parameter change accelerates the potential descending speed and ensures the falling edge reaches the threshold voltage timely, counteracting the deteriorating effect of the extended signal line
2Area of stationary object
If the gate signal line transmits driving signal to distal end pixels, then the display panel coverage is improved, but the signal line is connected in series with loads such as capacitance and resistance causing waveform changes and pixel undercharging
Solution Approach 1:
The pull-down module serves as an intermediary that actively manages the signal quality at the distal end. By introducing this intermediate control mechanism, the system compensates for the signal degradation caused by long transmission distances, ensuring that pixels at the far end receive properly shaped driving signals with accurate charging characteristics
Solution Approach 2:
The pull-down module performs preliminary anti-action by pre-establishing a discharge path and actively pulling down the potential at the distal end before the next scanning cycle begins. This preliminary action prevents accumulation of residual charge and ensures clean signal transitions, counteracting the harmful effects of capacitive loads during signal transmission
3Length of stationary object
If the scan driving signal is transmitted through a long gate signal line, then the display panel size is increased, but the falling edge of the signal is delayed and waveform distortion occurs
Solution Approach 1:
The pull-down module acts as an intermediary that directly influences the potential at the distal end of the gate signal line. By providing an active discharge path through the pull-down transistor, it accelerates the falling edge speed and compensates for the delay caused by the long signal line and associated capacitive loads
Solution Approach 2:
The control circuit activates the pull-down module in advance during the falling edge period of the scan driving signal. This preliminary action ensures that the discharge path is established before the signal needs to transition, thereby accelerating the falling edge and preventing waveform distortion that would otherwise occur in long signal lines
Data Source
AI summary
The present disclosure provides a driving circuit of a display panel and a display device. The driving circuit includes a gate-on-array (GOA) circuit transmitting a scan driving signal to the display panel through a corresponding gate signal line, and further includes a pull-down module and a control bus. The pull-down module is activated at a falling edge of a gate driving signal to accelerate a potential descent speed of the pull-down module, thereby increasing a charging time of a thin film transistor and realizing a narrow-frame display panel.