Touch Sensing System with Loop Antenna for Pen Pressure Detection
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Solution Overview
Problem
Conventional touch sensing systems require separate structures for finger and pen touch modes, leading to increased size and complexity, and are inefficient in combining capacitance and electromagnetic induction methods, resulting in slower touch sensing and higher calculation and memory requirements.
Innovation Solution
A touch sensing system with a combined touch sensing structure using a touch screen panel with intersecting first and second lines and a loop-shaped antenna, where the touch processor detects touch coordinates and pressure by sequentially driving the lines and receiving resonance signals, allowing for both finger and pen touch modes without additional structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate touch sensing structures are provided for finger touch mode and pen touch mode, then both touch modes can be supported, but the size and device complexity increase
Solution Approach 1:
The patent combines the capacitance sensing structure (first and second lines forming sensor nodes) and electromagnetic induction structure (loop-shaped antenna) into a single integrated touch sensing system. This unified structure allows both finger touch mode (capacitance method) and pen touch mode (electromagnetic induction method) to be supported without requiring separate independent structures, thereby reducing device complexity while maintaining versatility
Solution Approach 2:
The integrated touch sensing structure is designed to perform multiple functions: it can detect finger touches through capacitance changes using the sensor nodes, and simultaneously detect pen touches through electromagnetic induction using the loop-shaped antenna. This multi-functional design eliminates the need for separate specialized structures for each touch mode
2Adaptability or versatility
If conventional separate touch sensing structures are used, then both touch modes can be provided, but the touch sensing speed decreases and calculation amount increases
Solution Approach 1:
By merging the capacitance and electromagnetic induction sensing methods into a single integrated structure, the system can efficiently process both finger and pen touch modes without the overhead of switching between separate systems. The unified architecture enables faster touch sensing by eliminating redundant processing steps and reducing calculation requirements
3Measurement precision
If all sensor nodes are sensed for pressure detection, then pressure detection accuracy is improved, but the touch sensing time increases
Solution Approach 1:
The patent applies local quality by selectively sensing only specific sensor nodes (main line and adjacent line) rather than all sensor nodes for pressure detection. This localized sensing approach maintains sufficient pressure detection accuracy by focusing on the relevant area around the touch point, while significantly reducing the time required to complete the sensing operation
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 high-speed touch sensing, reduces calculation and memory needs, and improves pressure detection accuracy in pen touch mode by using a combined capacitance and electromagnetic induction method.
Implementation Method 1
an antenna of a loop shape; and a touch processor that detects a coordinate of a point where a pen touches a screen, by sensing the sensor nodes through a sequential driving of the first lines and the second lines and a reception of a resonance signal of the pen touching the screen through the antenna
Implementation Method 2
a capacitance method for sensing a touch by sensing a change of a capacitance when a body or a specific object is contacted with the touch sensing system
Data Source
AI summary
The present disclosure is related to a touch sensing system and a display apparatus including: a touch screen panel defining sensor nodes by first lines and second lines formed in crossing directions, a loop type antenna, and a touch processor that performs a first touch process by receiving a signal with respect to driving pulses applied to each of the first lines and the second lines, through the antenna, and performs a second touch process by sequentially applying the driving pulses to each of two or more selected lines among the first lines and the second lines and by receiving a signal through the antenna.