In-Cell Touch Sensing Device Hover Mode Signal Segmentation
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Solution Overview
Problem
In-cell touch display devices face challenges with weak touch sensing signals and poor signal-to-noise ratios when users operate via air, plastic, or thick gloves, making effective touch determination difficult.
Innovation Solution
The sensing device employs a hover mode with a substrate and multiple sensing electrodes grouped into hovering units, where only a portion of the electrodes form identification patterns to enhance signal strength and differentiate touch signals from noise.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If conventional touch sensing is used with air, plastic, or thick gloves, then the device can be operated without direct contact, but the sensing signal becomes weak and signal-to-noise ratio deteriorates
Solution Approach 1:
The sensing electrodes are divided into multiple hovering units, with each unit containing multiple sensing electrodes that are independently controlled. This segmentation allows selective activation of electrode groups to form identification patterns, improving signal quality while maintaining operation capability through air or with gloves.
Solution Approach 2:
Different regions of the sensing electrode array are assigned different functions: some regions form identification patterns for hover detection, while others serve as reference electrodes. This local differentiation enables the system to distinguish between genuine hover operations and noise, improving measurement precision without sacrificing ease of operation.
2Measurement precision
If all sensing electrodes are activated to improve signal strength, then detection sensitivity increases, but noise and false positives also increase
Solution Approach 1:
The sensing electrodes are segmented into hovering units that can be selectively activated. Only the necessary electrodes for forming identification patterns are activated during hover detection, reducing overall noise while maintaining detection sensitivity for genuine hover events.
Solution Approach 2:
The system uses feedback from the identification pattern recognition to determine whether a detected signal represents a genuine hover operation or noise. The controller activates hovering units and evaluates the resulting patterns, using this feedback to distinguish valid inputs from noise and adjust subsequent detection accordingly.
3Measurement precision
If hover mode is implemented with identification patterns, then touch determination accuracy improves, but device complexity increases
Solution Approach 1:
The sensing electrode array is segmented into multiple hovering units, each capable of forming identification patterns. This modular segmentation allows the complex hover detection function to be distributed across multiple simple, identical units, reducing overall system complexity while improving accuracy.
Solution Approach 2:
Multiple hovering units with identical structures are used to perform the same hover detection function. This universality allows the system to achieve high touch determination accuracy through pattern recognition across multiple units without requiring each unit to be complex, as each unit follows the same simple identification pattern formation protocol.
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
The hover mode improves signal quality by combining sensing signals from identification electrodes, filtering out noise, and enabling accurate touch determination even with low dielectric materials or gloved operation.
Implementation Method 1
In the In-cell touch display device, mutual capacitance sensing mechanism or self capacitance sensing mechanism may be applied
Implementation Method 2
When hovering on the cover glass, touching on the plastic cover or wearing a thick glove to operate, the user operates via air, plastic, or a glove with small dielectric constants
Data Source
AI summary
A sensing device having a hover mode is provided. The sensing device includes a substrate; and a plurality of sensing electrodes, disposed on the substrate, and defined as a plurality of hovering units in the hover mode, wherein the plurality of hovering units comprise a first hovering unit, and sensing electrodes with signals in the first hovering unit form a first identification pattern.