GOA Circuit All Gate On Stability via Pre-Charging
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Solution Overview
Problem
Conventional Gate Driver On Array (GOA) circuits fail to stably implement the All Gate On function, which is essential for display devices to operate effectively, especially when cooperating with touch panels and requiring a black screen wake-up process.
Innovation Solution
A GOA circuit with cascaded units, each including a full-on controlling module, level module, pull-up and pull-down modules, and maintaining modules, where the horizontal scanning lines connect to Gate All Selected Signals (GAS) to ensure all gate lines are charged, utilizing transistors and capacitors to manage clock and voltage signals for stable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the GOA circuit suspends signals to cooperate with touch panel functions, then the touch panel can be scanned, but the display device requires a black screen wake-up process and the GOA circuit needs additional time to charge all gate lines
Solution Approach 1:
The patent applies preliminary action by pre-charging the gate lines through the full-on controlling module before the display operation begins. The GAS signal activates the first transistor to charge all gate lines in advance, so when the black screen wake-up occurs, the gate lines are already prepared and charged, reducing the time needed for the All Gate On stage.
2Reliability
If the conventional GOA circuit implements the All Gate On function, then the display performance can be improved, but the circuit becomes unstable and fails
Solution Approach 1:
The patent applies beforehand cushioning by introducing the full-on controlling module with the first transistor that pre-charges all gate lines before the display operation. This preliminary charging action cushions against the potential failure that would occur during the All Gate On stage, ensuring stable operation by preparing the gate lines in advance with proper voltage levels.
3Manufacturing precision
If the gate lines are charged during the All Gate On stage, then the residual level in pixel capacitor can be cleaned out, but the conventional GOA circuit fails to provide stable All Gate On requirement
Solution Approach 1:
The patent applies preliminary action by using the GAS signal to activate the full-on controlling module, which charges all gate lines before the display operation begins. This ensures that when the black screen wake-up occurs and the pixel capacitors need to be cleared, the gate lines are already charged and ready, enabling reliable execution of the All Gate On function.
Data Source
AI summary
A GOA circuit, a display device, and a driving method of GOA circuit are disclosed. A N-th level GOA unit is configured for charging the N-th level horizontal scanning line (G(N)) within a display area of the display device. The N-th level horizontal scanning line (G(N)) connects to GAS. In response to the GAS, the horizontal scanning lines corresponding to all of the GOA units are in a charging state. In this way, the horizontal scanning lines at each level are connected to the GAS, such that when the GAS are valid, the corresponding horizontal scanning line at each level are in the charging state of in an on-state so as to realize the All Gate On function.