Touch Display Gate Driving Circuit for Load-Free Voltage Toggling
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Solution Overview
Problem
Existing driving circuits for in-cell touch display panels struggle to provide load-free driving functions due to the inability to toggle gate voltages during touch sensing, which is hindered by feedback mechanisms designed for maintaining constant voltage levels.
Innovation Solution
A driving circuit with a modified structure incorporating switches, multiplexers, and capacitors that allow gate voltages to toggle during touch sensing without altering the internal structure of the power integrated circuit, using diodes or transistors to block feedback and enable load-free driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If feedback mechanisms are used to maintain constant voltage levels in the power integrated circuit, then voltage stability is improved, but the ability to toggle gate voltages during touch sensing deteriorates
Solution Approach 1:
The circuit is segmented into two independent paths: one for voltage regulation (maintaining stability) and one for signal toggling (enabling adaptability). The switch circuitry separates the feedback path from the gate drive path, allowing each to operate independently without interfering with the other.
Solution Approach 2:
Switches and capacitors are introduced as intermediary elements between the power integrated circuit and the gate lines. These intermediaries allow the gate voltages to be toggled during touch sensing while the feedback mechanism continues to maintain voltage stability at the power integrated circuit level.
2Adaptability or versatility
If the power integrated circuit structure is modified to enable load-free driving, then gate voltage toggling capability is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The load-free driving functionality is extracted from the power integrated circuit itself and implemented as an external switch circuit. This extraction allows the power integrated circuit to remain simple and easy to manufacture, while the toggling capability is added through separate, modular switch components.
Solution Approach 2:
The switch circuitry serves multiple functions: it enables gate voltage toggling for touch sensing, maintains compatibility with standard power integrated circuits, and can operate in both display and touch modes. This multi-functionality is achieved without requiring modifications to the power integrated circuit structure.
3Adaptability or versatility
If switches and capacitors are added to enable gate voltage toggling, then load-free driving capability is improved, but circuit complexity increases
Solution Approach 1:
The circuit transitions from a static voltage regulation mode to a dynamic toggling mode through the use of switches and capacitors. These dynamic elements allow the gate voltages to be rapidly switched between different levels during touch sensing, enabling load-free driving while maintaining a relatively simple overall circuit structure.
Data Source
AI summary
A driving circuit, for driving a touch display panel, includes a controller, a first diode, a first capacitor, a second diode and a second capacitor. The controller is configured to provide a first modulation signal and a second modulation signal. The first diode is coupled between a power integrated circuit and a first node for providing a low gate output signal to the touch display panel. The first capacitor is coupled between the controller and the first node. The second diode is coupled between the power integrated circuit and a second node for providing a high gate output signal to the touch display panel. The second capacitor is coupled between the controller and the second node. During a touch period, the controller is configured to provide the first modulation signal with toggling voltage levels, and provide the second modulation signal with toggling voltage levels.