GOA Circuit Reset Module for Display Panel Stability
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Solution Overview
Problem
High-resolution display panels face poor level transfer stability due to increased scanning lines and the likelihood of power failures, leading to residual charge and abnormal display issues without a power-off scan and reset function.
Innovation Solution
A Gate Driver on Array (GOA) circuit with multi-level cascaded units, including pull-up, pull-down, holding, and reset modules, is designed to manage scan signals and potentials, ensuring all gates are discharged and set to low potential, enhancing scanning stability and preventing abnormal power conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of scanning lines is increased to achieve higher resolution, then the display resolution is improved, but the level transfer stability deteriorates
Solution Approach 1:
The gate driver circuit is divided into multiple independent GOA units, each handling a specific scanning line. Each unit contains separate pull-up and pull-down modules that can operate independently, ensuring stable level transfer even as the total number of scanning lines increases. This segmentation prevents error propagation across all lines when one line experiences issues.
Solution Approach 2:
The circuit incorporates a reset module that performs preliminary resetting of the scan signal output end before normal operation begins. This preliminary action clears any residual charge or erroneous states that may have accumulated, ensuring a clean starting state for each scanning cycle and preventing abnormal display conditions.
2Device complexity
If power-off scan and reset functions are not implemented, then the device complexity is reduced, but the reliability under power failure conditions deteriorates
Solution Approach 1:
The reset module is configured to perform resetting operations preliminarily, before normal scanning begins and after power failure occurs. By implementing this preliminary reset function, the circuit ensures that any residual charge or erroneous states are cleared before they can cause abnormal display, without requiring complex additional hardware beyond the integrated reset module.
Solution Approach 2:
The reset module serves multiple functions: it resets the scan signal output end during normal operation to maintain stability, and it performs power-off resetting to clear residual charge when power failure occurs. This multi-functionality allows a single module to handle both routine and emergency reset conditions without increasing overall device complexity significantly.
3Ease of operation
If residual charge is not discharged during power failure, then the ease of operation is improved, but the reliability deteriorates due to abnormal display
Solution Approach 1:
The reset module performs preliminary discharge of residual charge from the scan signal output end before normal operation begins and after power failure. This preliminary action ensures that no residual charge remains to cause abnormal display, while the automatic operation of the reset module maintains ease of operation without requiring user intervention.
Solution Approach 2:
The reset module automatically detects and discharges residual charge without requiring external control or user action. The module self-regulates the discharge process through its integrated circuitry, maintaining display reliability while keeping the operation simple and automatic, thus achieving both reliability improvement and ease of operation.
Data Source
AI summary
In a GOA circuit and a display panel provided by embodiments of the present application, a reset module is provided in each level of GOA units, so that each level of the GOA units can output a high potential before an end of a frame, all gates in a display area are turned on, and a charge of all pixels in the display area is discharged; after that, each level of the GOA units outputs a low potential, and all of the gates in the display area are set to the low potential.