Touch Display Driving Circuit for Contact and Hover Sensing
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch display devices lack the capability to efficiently sense both contact and non-contact touch interactions, such as hover pointing and gestures, limiting their versatility and functionality.
Innovation Solution
A touch display device with a driving circuit that supports multiple touch sensing modes, including contact touch, hover pointing, and hover gesture modes, using distinct touch driving signals with varying amplitudes and electrical connections among touch electrodes to differentiate and efficiently detect these interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a single touch sensing mode is implemented, then the device structure remains simple, but the device cannot support diverse touch interactions such as contact touch, hover pointing, and hover gesture
Solution Approach 1:
The patent implements dynamic switching between multiple touch sensing modes (contact touch mode, hover pointing mode, hover gesture mode) by changing the touch driving signal characteristics. The touch driving circuit dynamically adjusts signal amplitude and electrode connection configurations based on the desired sensing mode, enabling the system to adapt its behavior without requiring separate hardware for each mode.
Solution Approach 2:
The patent changes key parameters of the touch driving signal to differentiate between sensing modes. Specifically, it varies the signal amplitude (first amplitude for contact mode, second amplitude for hover pointing mode, third amplitude for hover gesture mode) and modifies electrode connection configurations (electrically separated vs. electrically connected). These parameter changes enable diverse touch sensing capabilities while using the same physical hardware.
2Adaptability or versatility
If multiple touch sensing modes are supported with distinct driving signals, then diverse touch interactions can be detected, but power consumption increases
Solution Approach 1:
The touch driving circuit dynamically selects and switches between different sensing modes based on operational requirements. By activating only the necessary sensing mode at any given time rather than continuously operating all modes, the system reduces overall power consumption while maintaining the capability to support diverse touch interactions when needed.
Solution Approach 2:
The patent employs periodic switching between different touch sensing modes and operating states. The system can alternate between active sensing periods and low-power states, using periodic touch driving signals that are optimized for each specific mode. This periodic action allows the device to maintain sensing capability while reducing average power consumption compared to continuous full-featured operation.
3Measurement precision
If different amplitude touch driving signals are used for different sensing modes, then accurate differentiation between contact and hover touches is achieved, but signal processing complexity increases
Solution Approach 1:
The patent uses distinct signal amplitude parameters to encode different sensing modes: first amplitude for contact touch mode, second amplitude for hover pointing mode, and third amplitude for hover gesture mode. The touch driving circuit and controller are designed to generate and recognize these amplitude variations, enabling accurate mode differentiation through parameter-based signal classification rather than complex processing algorithms.
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 sensing of contact and non-contact touches, including hover pointing and gestures, while reducing power consumption through optimized operation modes.
Implementation Method 1
a touch sensor including a plurality of touch electrodes
Data Source
AI summary
Embodiments of the present disclosure is related to a touch display device, a driving circuit and a driving method thereof, and may provide a touch display device, a driving circuit and a driving method thereof capable of efficiently sensing a contact touch, a non-contact pointing touch pointing to a point on the screen (e.g., hover pointing touch), and a non-contact gesture with movement (e.g., hover gesture).