Touch Electrode Timing for Reliable Active Pen Recognition
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Solution Overview
Problem
Existing touch devices struggle to reliably distinguish between finger touches and active pen inputs, particularly in large and high-speed displays, leading to deteriorated sensing performance and operational reliability.
Innovation Solution
A touch device with touch electrodes and a touch driver that transmits uplink signals to an active pen during a first period and receives sensing signals during a second period, using capacitive coupling and Bluetooth® wireless technology to enhance recognition, with a switch circuit for selective signal application and a driving mode that includes both pen and touch modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If display size and speed are increased, then display performance is improved, but sensing performance for touch recognition deteriorates
Solution Approach 1:
The touch panel is divided into multiple touch electrode groups (first touch electrode groups and second touch electrode groups) arranged in different directions. This segmentation allows the system to independently sense touches in different orientations, improving overall sensing precision without compromising display performance.
Solution Approach 2:
The touch driver alternates between different driving modes (pen mode and touch mode) in periodic time periods. During pen mode, uplink signals are transmitted to active pens; during touch mode, downlink signals are transmitted for finger touch sensing. This periodic switching enables reliable distinction between pen and finger touches while maintaining high display speed.
2Adaptability or versatility
If conventional touch sensing is used, then display function is provided, but reliable distinction between finger touch and active pen touch deteriorates
Solution Approach 1:
The touch driver dynamically switches between different driving modes (pen mode and touch mode) based on the type of touch detected. The system adjusts its operation in real-time, transmitting uplink signals when active pen touch is detected and downlink signals for finger touch sensing, thereby achieving reliable distinction between different touch types.
Solution Approach 2:
The patent introduces an intermediary switching mechanism that routes different signal types (uplink and downlink) through the same touch electrode infrastructure. This intermediary layer enables the system to handle both active pen and finger touch recognition through a unified interface, improving adaptability while maintaining reliability.
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
Improves the reliability of active pen recognition by accurately distinguishing between finger and pen touches, enhancing sensing performance and operational reliability in large and high-speed displays.
Implementation Method 1
using capacitive coupling and Bluetooth® wireless technology to enhance recognition
Data Source
AI summary
A touch device includes a touch panel including touch electrodes, and a touch driver adjacent to the touch panel, configured to sense a touch of a user, configured to transmit uplink signals including position information of the touch electrodes to an active pen through at least some of the touch electrodes in a first touch period, and configured to receive a sensing signal including position information of the active pen, which is calculated using the uplink signals, from the active pen in a second touch period after the first touch period.