Touch Display Compensation Module for Voltage Interference
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In touch display technologies, voltage fluctuations at connection points between the touch display control apparatus and the touch display panel are interfered with due to wiring and circuit structures, leading to inconsistent voltage ranges, which affect image display quality, especially in TDDI systems where touch and display driving are time-shared.
Innovation Solution
The implementation of a touch display control apparatus with compensation modules comprising series-connected N-type and P-type MOS transistors, which counteract interference voltages at compensation nodes, ensuring the voltage remains within an ideal range by connecting touch detection channels or a common voltage signal to the touch display panel, thereby stabilizing the common voltage driving capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch detection channels are connected to the touch display panel through wiring and circuit structures, then touch detection function is achieved, but voltage fluctuation and interference occur at connection points
Solution Approach 1:
A compensation module is introduced as an intermediary component between the touch detection channel and the touch display panel. This compensation module includes a compensation electrode that is coupled to the connection point and can generate a compensation signal to counteract the interference voltage, thereby eliminating the harmful voltage fluctuation while maintaining the touch detection function
2Reliability
If common voltage VCOM is connected to the touch control line in display stage, then display driving is enabled, but interference from wiring and circuit structures affects the voltage range at connection points
Solution Approach 1:
The compensation module operates by detecting the interference voltage at the connection point and generating a compensating signal in response. The compensation electrode produces a feedback signal that counteracts the interference, ensuring the common voltage remains within the ideal range for display driving while compensating for the harmful effects of wiring and circuit structure interference
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively reduces the impact of voltage fluctuations, maintaining a consistent common voltage at connection points, preventing horizontal or vertical stripes in image display by quickly stabilizing the voltage within an ideal range, thus enhancing display quality.
Implementation Method 1
each compensation module comprises a first transistor and a second transistor that are connected in series between a first supply voltage and a second supply voltage
Data Source
AI summary
This application discloses a touch display control apparatus and a touch display apparatus. The touch display control apparatus comprises: a touch control module for touch detection, wherein the touch control module comprises touch detection channels, and performs the touch detection according to touch sensing signals received through the touch detection channels; a display control module for display control, wherein the display control and touch detection are performed in time sharing manner; selection modules for selectively connecting the touch detection channels or a common voltage signal to a touch display panel, wherein nodes connecting the selection modules and the touch display panel are compensation nodes, the touch display control apparatus further comprises compensation modules respectively connected to the compensation nodes, each compensation module counteract an interference voltage coupled to a corresponding compensation node when the interference voltage exceeds a preset value, thereby avoiding a horizontal or vertical stripe in displayed images.