Inverting Circuit for Touch Display Panel
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Solution Overview
Problem
Existing touch display panels have low touch accuracy due to high capacitance to ground of their touch electrodes, resulting in low touch driving frequency.
Innovation Solution
An inverting circuit with an input module and an output module is used to control the potential of a node based on input signals, which includes transistors and capacitors, and a driving method that switches off light-emitting control signals in a touch stage to reduce capacitance to ground, thereby reducing the resistive and capacitive load of the touch electrode and increasing touch driving frequency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the touch electrode is integrated into the display panel, then the display panel has touch-control function, but the capacitance to ground of the touch electrode increases
Solution Approach 1:
The patent segments the driving function by introducing a separate inverting circuit that operates independently from the main display driving circuit. This inverting circuit specifically handles the touch electrode driving signals, separating the touch control function from the display function. This segmentation allows the touch electrode to be driven with optimized signals that reduce capacitance to ground, while the display panel maintains its integrated touch-control capability.
Solution Approach 2:
The inverting circuit acts as an intermediary between the control signal source and the touch electrode. It receives control signals and inverts them before outputting to the touch electrode, thereby reducing the capacitance to ground. This intermediary component enables the system to maintain the integrated touch display function while mitigating the harmful effect of high capacitance through signal transformation.
2Adaptability or versatility
If the touch electrode has high capacitance to ground, then the touch display panel can be integrated, but the touch driving frequency decreases
Solution Approach 1:
The inverting circuit changes the electrical parameters of the driving signal by inverting the control signals before outputting them to the touch electrode. This parameter transformation reduces the effective capacitance to ground, thereby increasing the touch driving frequency while maintaining the integrated structure of the touch display panel.
3Device complexity
If the touch electrode has high capacitance to ground, then the display panel structure is simplified, but the touch accuracy decreases
Solution Approach 1:
The inverting circuit serves as an intermediary that improves touch accuracy without complicating the overall structure. By inserting this signal inversion stage between the control signal source and the touch electrode, the system achieves better touch detection precision through reduced capacitance effects, while the structural complexity remains manageable due to the simple circuit implementation.
Data Source
AI summary
The present invention discloses an inverting circuit, a driving method thereof, a touch display panel and a touch display device. The inverting circuit includes an input module and an output module, the input module is used for controlling a potential of the first node, and the output module is used for controlling, under the control of the potential of the first node, an output signal of the first output terminal according to input signals of the first input terminal, the third voltage terminal and the third signal terminal. In the technical solutions provided by the present invention, a light-emitting control signal is switched off in a touch stage by means of time-sharing driving to lower the capacitance to ground of the touch electrode, so that resistive and capacitive load of the touch electrode is reduced, touch driving frequency is increased, and touch accuracy is thus improved.