Shift Register Unit Touch Display Leakage Current Control
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Solution Overview
Problem
In touch display panels, the leakage current in gate drivers during touch time periods leads to deformation of gate drive signals, resulting in insufficient pixel charging and the formation of dark lines on the display due to the insufficient turn-on of transistors.
Innovation Solution
A shift register unit is designed with an input circuit, a first control circuit, and an output circuit that maintains the first scan voltage connection during touch enable signals, preventing potential reduction at the node due to transistor leakage, ensuring full turn-on of transistors after the touch time period and preventing dark lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the gate driver operates during touch time periods, then the touch function is enabled, but leakage current causes deformation of gate drive signals resulting in dark lines
Solution Approach 1:
The patent applies preliminary action by maintaining the first scan voltage connection to the first node during the entire touch time period before the actual touch scanning occurs. This preventive measure ensures that the node potential does not drop due to leakage current, thereby preventing dark line formation before it can occur. The control circuit proactively keeps the connection active during touch enable signals, rather than waiting for signal degradation to occur.
2Reliability
If the first scan voltage connection is maintained during touch time period, then dark lines are prevented, but power consumption increases
Solution Approach 1:
The patent applies dynamics by making the first scan voltage connection controllable and switchable based on operational mode. During touch time periods, the connection is maintained to prevent dark lines. During normal display operation, the connection can be disconnected to save power. The control circuit dynamically adjusts the connection state according to the touch enable signal, optimizing both display quality and power consumption.
3Manufacturing precision
If the transistor is fully turned on after touch time period, then pixel charging is sufficient, but the leakage current during touch period causes insufficient turn-on
Solution Approach 1:
The patent applies beforehand cushioning by maintaining the first scan voltage connection during the touch time period to compensate for the leakage current that would otherwise cause potential drop. This cushioning effect ensures that when the touch time period ends and normal display operation resumes, the transistor is already in a fully turned-on state with sufficient gate voltage, enabling proper pixel charging without degradation.
Data Source
AI summary
A shift register unit, a driving method for driving the shift register unit, a gate driver, a touch display panel, and a touch display device are disclosed. The shift register unit includes an input circuit being configured to control a level of a first node in response to an input pulse received at an input terminal; a first control circuit being configured to, under control of the input pulse received at the input terminal and a touch enable signal received a touch enable signal terminal, connect a first scan voltage terminal to the first node to control the level of the first node; an output circuit being configured to connect a clock terminal to an output terminal in response to a potential of the first node, to output a clock signal received by the clock terminal at the output terminal.