GOA Driving Circuit Two Pulse Precharging for Pixel Charging
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Solution Overview
Problem
The existing Gate on Array (GOA) driving circuit for liquid crystal display panels often experiences insufficient charging, leading to abnormal display issues.
Innovation Solution
A method and device that utilize an initial scanning signal with two pulse signals to pre-charge and charge pixel drive cells, where the liquid crystal polarity of molecules in one row is the same as in another row, improving charging time and addressing the insufficient charging problem.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a single pulse signal is used for charging pixel drive cells in GOA driving circuit, then the device complexity is reduced, but the charging time is insufficient causing abnormal displaying
Solution Approach 1:
The charging process is segmented into two distinct phases: a first pulse signal for initial charging and a second pulse signal for subsequent charging. This segmentation allows each pulse to perform a specific charging function, ensuring adequate charging time and voltage for the pixel drive cells, thereby preventing abnormal displaying while maintaining signal structure manageability
Solution Approach 2:
The first pulse signal performs preliminary charging action on the pixel drive cells before the second pulse signal arrives. This preliminary action prepares the capacitor by establishing an initial voltage level, ensuring that when the second pulse arrives, the charging process can continue smoothly without time insufficiency, thus guaranteeing proper display operation
2Productivity
If the scanning signal frequency is increased to improve refresh rate, then the productivity is improved, but the charging time for each pixel drive cell is reduced causing insufficient charging
Solution Approach 1:
The two pulse signals are designed to provide continuous useful action for charging the pixel drive cells. The first pulse initiates charging and the second pulse continues it, ensuring that the charging process is not interrupted even at higher refresh rates. This continuous charging action maintains adequate charging time for each pixel drive cell while supporting improved productivity through higher refresh rates
Data Source
AI summary
A method and a device for driving a display panel are provided by embodiments of the present application. The method includes: outputting an initial scanning signal including two pulse signals; pre-charging an x-th row of pixel drive cells when the x-th row of pixel drive cells receive a first pulse signal; and charging the x-th row of pixel drive cells when the x-th row of pixel drive cells receive a second pulse signal, writing data into the x-th row of pixel drive cells, and meanwhile, pre-charging an x+4m-th row of pixel drive cells.