Touch Display Device with Dynamic Touch Driving Circuit
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Solution Overview
Problem
Existing touch display devices struggle to efficiently sense both contact and non-contact touches, and are prone to unwanted parasitic capacitance during non-contact touch sensing.
Innovation Solution
A touch display device and driving circuit that utilizes a touch sensor with first and second touch electrodes, employing distinct touch driving signals and auxiliary driving signals to efficiently sense contact and non-contact touches, while minimizing parasitic capacitance through electrical connections and phase-matched auxiliary driving.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a touch display device uses conventional touch sensing methods, then it can sense contact touch, but it cannot efficiently sense non-contact touch and is prone to parasitic capacitance
Solution Approach 1:
The patent implements dynamic switching between different touch sensing modes (contact touch mode and non-contact touch mode) based on operational requirements. The system transitions from a static sensing approach to a dynamic one, selecting appropriate sensing methods according to whether the device needs to detect physical contact or proximity-only interactions, thereby achieving versatile touch sensing capability.
Solution Approach 2:
The patent changes electrical parameters (such as drive signal characteristics and electrode configuration) to optimize sensing performance for different touch modes. By adjusting these parameters, the system can effectively sense both contact and non-contact touches while minimizing parasitic capacitance interference, resolving the reliability issue.
2Productivity
If the touch display device supplies drive signals to all touch electrodes during non-contact touch sensing, then it can sense hover touch, but unwanted parasitic capacitance occurs
Solution Approach 1:
The patent segments the touch electrode array into sensing regions and non-sensing regions. During non-contact touch sensing, drive signals are selectively supplied only to specific sensing electrodes while other electrodes are left un-driven or grounded. This segmentation prevents parasitic capacitance formation between driven and undriven electrodes, enabling fast sensing without interference.
Solution Approach 2:
The patent introduces auxiliary driving signals as intermediaries to manage the electrical state of non-sensing electrodes. These auxiliary signals act as mediators that prevent unwanted capacitance coupling while maintaining the overall electrical balance of the touch sensor, allowing high-speed sensing without parasitic interference.
3Reliability
If the touch display device uses separate drive signals for different electrode regions, then parasitic capacitance is reduced, but device complexity increases
Solution Approach 1:
The patent designs the driving circuit to perform multiple functions using a unified architecture. The same circuit infrastructure supports both contact touch sensing and non-contact touch sensing modes, as well as both sensing and non-sensing electrode regions. This multi-functionality reduces overall device complexity despite the need for separate drive signals in different regions.
Solution Approach 2:
The patent employs periodic switching of drive signals to different electrode regions. Instead of continuously providing separate drive signals to all regions, the system periodically activates different electrode sets based on the sensing mode. This periodic action simplifies the driving circuit by reusing the same signal generation resources across different time periods.
4Area of stationary object
If the touch display device drives all touch electrodes during hover touch sensing, then sensing coverage is maximized, but power consumption increases
Solution Approach 1:
The patent applies partial action by driving only the necessary subset of touch electrodes required for hover touch sensing rather than all electrodes simultaneously. This selective driving maintains adequate sensing coverage for the intended application while significantly reducing power consumption by leaving other electrodes in a low-power state.
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
Enables efficient and rapid sensing of both contact and non-contact touches, reducing unwanted capacitance and optimizing power consumption.
Implementation Method 1
the touch sensor may include a plurality of first touch electrodes and a plurality of second touch electrodes
Implementation Method 2
a touch driving circuit configured to supply a touch driving signal to the touch sensor
Data Source
AI summary
Embodiments of the present disclosure are related to a touch display device and a touch driving circuit. In the touch display device, a touch sensing mode period may include a first touch sensing mode period in which a first touch driving signal having a first amplitude is applied to the touch sensor, and a second touch sensing mode period in which a second touch driving signal having a second amplitude greater than the first amplitude is applied to the touch sensor. During the second touch sensing mode period, the touch driving circuit may supply the second touch driving signal to a part of the touch sensor and supply an auxiliary driving signal to another part of the touch sensor.