GOA Drive Circuit Trigger Unit Timing Control
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Solution Overview
Problem
Existing GOA drive circuits experience poor charging of scan lines due to late deactivation of the start vertical signal, leading to deteriorated display effects and quality in liquid crystal display devices.
Innovation Solution
Incorporating additional thin film transistors into the trigger units of the GOA drive circuit to control the input of the start vertical signal, allowing for improved timing control of scan clocks and utilization of bootstrap capacitors to lift potentials at scan control signal points, thereby preventing poor charging of scan lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the start vertical signal is activated during the high level period of scan clocks, then the trigger unit can be properly triggered, but the potential at scan control signal point Q weakens due to coupling effect, causing poor charging of scan lines
Solution Approach 1:
The trigger unit is segmented into multiple thin film transistors (first TFT, second TFT, third TFT) with distinct functions. The first TFT controls the start vertical signal input, the second TFT controls the trigger signal output, and the third TFT manages the bootstrap capacitor connection. This segmentation allows independent optimization of each function, enabling proper trigger activation while preventing potential weakening during scan clock high level periods.
Solution Approach 2:
The bootstrap capacitor is pre-charged to a high potential before the scan clock reaches its high level period. The third TFT is configured to disconnect the bootstrap capacitor from the scan control signal point Q before the scan clock goes high, preventing the coupling effect from weakening the potential. This preliminary action ensures that the scan lines are properly charged before scanning begins.
2Manufacturing precision
If additional thin film transistors are added to control the start vertical signal input, then the timing control of scan clocks is improved and scan line charging is enhanced, but the device complexity increases
Solution Approach 1:
The bootstrap capacitor serves multiple functions: it stores energy to maintain high potential at scan control signal point Q, it couples the scan clock signal to the trigger unit, and it can be disconnected to prevent potential weakening. The third TFT enables the bootstrap capacitor to perform these multiple functions by controlling its connection and disconnection timing, reducing the need for separate dedicated components.
Solution Approach 2:
The control functions for the start vertical signal input, trigger signal output, and bootstrap capacitor connection are merged into a single integrated trigger unit structure. The first, second, and third TFTs work together in a coordinated manner within the same trigger unit, allowing timing control improvement without proportionally increasing the overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively alleviates the poor charging condition of scan lines, enhancing the quality of the display screen by ensuring timely and efficient activation of scan signals across the liquid crystal display panel.
Implementation Method 1
they constantly stay in a high level. This weakens a potential at scan control signal point Q (as shown in FIG. 2) of each of first K scan control signals under a coupling effect of a bootstrap capacitor
Data Source
AI summary
Disclosed is a GOA drive circuit, including a plurality of GOA drive units. Each trigger unit in first K GOA drive units includes a first thin film transistor, which has a gate connected to a trigger clock corresponding to the trigger unit. The trigger clock is configured to turn off the trigger unit when a scan clock of an output unit corresponding to the trigger unit is at a high level.