Gate Drive Circuit Voltage Stabilization for In-Cell Touch Displays
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Solution Overview
Problem
In In-Cell touch display screens, the integration of touch scanning and display driving circuits leads to potential issues with voltage stabilization, causing insufficient output voltages in shift register units due to current leakage, resulting in display abnormalities like horizontal lines.
Innovation Solution
A gate drive circuit with cascaded shift register units and a voltage stabilization circuit that compensates node levels in response to touch scanning control signals, ensuring stable voltage levels across shift register units during touch scanning phases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch scanning control signals are integrated into the gate drive circuit, then touch scanning functionality is achieved, but voltage instability and current leakage occur in shift register units
Solution Approach 1:
A voltage stabilization circuit is introduced as an intermediary component between the touch scanning control signals and the shift register units. This circuit receives the touch scanning control signals and generates stabilized compensation signals to maintain proper voltage levels at the first nodes of shift register units, preventing voltage instability and current leakage while enabling touch scanning functionality.
Solution Approach 2:
The voltage stabilization circuit performs preliminary action by pre-charging the first nodes of shift register units before they are needed for normal operation. By anticipating voltage drops that would occur during touch scanning phases, the circuit proactively maintains voltage levels through compensation signals, preventing the harmful effects of voltage instability before they manifest.
2Productivity
If cascaded shift register units are used to drive gate lines, then display driving capability is improved, but output voltage becomes insufficient due to current leakage
Solution Approach 1:
The voltage stabilization circuit implements feedback by monitoring the state of shift register units and dynamically adjusting compensation signals. The circuit receives touch scanning control signals and uses them to generate feedback-based compensation that maintains adequate output voltage levels in cascaded shift register units, counteracting the voltage drop caused by current leakage while preserving display driving capability.
3Productivity
If touch scanning phase is inserted in display phase, then touch reporting rate is enhanced, but display abnormalities occur due to voltage instability
Solution Approach 1:
The voltage stabilization circuit performs preliminary charging of shift register units before touch scanning phases begin. By proactively maintaining voltage levels at first nodes through compensation signals generated from touch scanning control signals, the circuit prevents display abnormalities such as horizontal lines that would otherwise occur during touch scanning, allowing high touch reporting rates without sacrificing display quality.
Data Source
AI summary
A gate drive circuit, a touch display device and a driving method are provided. The gate drive circuit includes a plurality of cascaded shift register units and a voltage stabilization circuit. Each of the plurality of cascaded shift register units includes a touch scanning control terminal; and the voltage stabilization circuit is connected to a first shift register unit and at least one second shift register unit after the first shift register unit, of the plurality of cascaded shift register units, and configured to compensate a level of a first node of the group of second shift register units in response to the touch scanning control signal.