Gate Drive Unit Pull-Down Circuit Flickering Control
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Solution Overview
Problem
Existing display touch devices experience screen flickering due to the inability to maintain a high voltage potential at the pull-up node during the touch phase, leading to inefficient touch scanning and display performance.
Innovation Solution
A driving method and gate drive unit that includes a pull-down circuit to control the disconnection between the pull-up node and the pull-down voltage terminal during the touch phase, ensuring the pull-up node's potential is maintained by disconnecting the path and turning off the pull-down transistor for a duration greater than or equal to the touch phase, thereby preventing potential leakage and ensuring correct operation during display phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pull-down circuit maintains connection between the pull-up node and the pull-down voltage terminal during the touch phase, then the pull-down transistor can be kept on for continuous potential regulation, but the potential at the pull-up node cannot be maintained at high voltage causing screen flickering
Solution Approach 1:
The patent applies periodic action by controlling the pull-down transistor to operate in periodic on/off cycles synchronized with the display and touch phases. During display phases, the transistor is turned on to regulate potential; during touch phases, it is turned off to maintain high voltage. This periodic switching resolves the contradiction by timing the connection/disconnection to match operational requirements, eliminating screen flickering while maintaining manageable control complexity through phase-synchronized control signals.
2Reliability
If the pull-down transistor is turned off during the touch phase to maintain pull-up node potential, then screen flickering is reduced, but the touch scanning function may be affected
Solution Approach 1:
The patent applies preliminary action by pre-configuring the pull-down transistor control timing to be turned off before the touch phase begins and turned on after the touch phase completes. This advance timing ensures that the potential at the pull-up node is already stabilized to high voltage before touch scanning starts, and is restored after touch scanning completes. This resolves the contradiction by ensuring potential maintenance during touch phases without interfering with touch scanning productivity, as the transistor state changes are synchronized to occur at appropriate boundaries rather than during active touch scanning.
3Stability of the object's composition
If the pull-down circuit continuously connects the pull-up node to the pull-down voltage terminal, then potential regulation is continuous, but the display phase operation becomes incorrect due to potential leakage
Solution Approach 1:
The patent applies dynamics by making the pull-down transistor control state dynamic rather than static, switching between on and off states based on the operational phase (display or touch). During display phases, the transistor is turned off to prevent potential leakage and ensure correct operation; during touch phases, it is turned on to provide continuous potential regulation. This dynamic adaptation resolves the contradiction by adjusting the connection state according to real-time operational requirements, ensuring both potential stability during touch phases and correct display phase operation.
Data Source
AI summary
Provided are a driving method, a gate drive unit and a display touch device. The driving method is applied to the gate drive unit in the display touch device. The gate drive unit includes at least one pull-down circuit. The pull-down circuit is coupled with a pull-up node and a pull-down voltage terminal, and is configured to control connection or disconnection between the pull-up node and the pull-down voltage terminal; one frame of image display time includes a display phase and a touch phase that are alternately set, and at least one of the touch phase is set between two adjacent display phases. The driving method includes: during the touch phase, controlling, by the at least one pull-down circuit, the disconnection between the pull-up node and the pull-down voltage terminal. The problem of a screen flashing phenomenon of existing display touch devices during the touch phase is solved.