Touch Sensing Device for Active Pen High Resolution Displays

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Solution Overview

Problem

Existing touch sensing devices for active pens require separate periods for sensing pen data and touch coordinates, leading to increased touch sensing periods and limitations in implementing high-resolution display apparatuses.

Innovation Solution

A touch sensing device that transmits an uplink signal to an active pen during a first touch sensing period and senses a downlink signal to generate sensing data, allowing simultaneous calculation of pen data and touch coordinates during multiple second touch sensing periods within one frame, thereby reducing the overall touch sensing period.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If separate touch sensing periods are used for sensing pen data and pen touch coordinates, then sensing accuracy is improved, but touch sensing period increases

Engineering Contradiction:

Improvesensing accuracyVSAvoidtouch sensing period

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent merges the sensing of pen data and pen touch coordinates into a single integrated touch sensing period. The touch sensing device simultaneously performs both sensing operations during the same time window, eliminating the need for separate sensing periods while maintaining sensing accuracy through coordinated signal processing.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The touch sensing device is designed to perform multiple functions within a single touch sensing period: it senses both pen data (such as pressure and tilt information) and pen touch coordinates simultaneously. This multi-functional approach allows the device to gather comprehensive pen information without extending the overall sensing time.

Inventive Principle:

Principle #6Universality (Multi-functionality)

2Loss of information

If touch sensing period is increased to sense pen data and coordinates separately, then sensing completeness is improved, but display period decreases

Engineering Contradiction:

Improvesensing completenessVSAvoiddisplay period

Core Design Contradiction:

Loss of informationVSDuration of action of moving object

Solution Approach 1:

The patent combines pen data sensing and touch coordinate sensing into one unified sensing operation. By integrating these functions, the system achieves complete pen information collection without extending the touch sensing period, thereby preserving adequate display period for high-resolution display apparatuses.

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The system implements periodic touch sensing within a single frame period, where each sensing cycle efficiently collects both pen data and touch coordinates. This periodic integration ensures that all necessary pen information is captured while maintaining the timing requirements for high-resolution display refresh rates.

Inventive Principle:

Principle #19Periodic action

3Measurement precision

If multiple separate touch sensing periods are used within one frame, then sensing coverage is improved, but frame period utilization decreases

Engineering Contradiction:

Improvesensing coverageVSAvoidframe period utilization

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

The patent consolidates multiple sensing functions into a single touch sensing period within each frame. By merging pen data sensing, touch coordinate sensing, and other pen-related measurements into one coordinated sensing operation, the system achieves comprehensive sensing coverage while maximizing frame period utilization for high-resolution displays.

Inventive Principle:

Principle #5Merging (Combining)

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

This approach decreases the touch sensing period, allowing for an increased display period and enabling the implementation of active pens in high-resolution display apparatuses.

Implementation Method 1

a touch sensing unit sensing a downlink signal transmitted from the active pen on the basis of a capacitance occurring between the active pen and the touch electrode to generate first sensing data

Methodology Applied

Scientific EffectCapacitance: Capacitance

Data Source

PatentUS11334200B2Touch sensing device for implementing high resolution and display apparatus including the same

Publication Date: 2022.05.17 SILICON WORKS CO LTD

AI summary

Disclosed is a touch sensing device for implementing a high resolution, which decreases a touch sensing period of an active pen in one frame to increase a display period. The touch sensing device includes a touch driver transmitting an uplink signal to an active pen through a touch electrode provided in a display panel during a first touch sensing period included in one frame period, a touch sensing unit sensing a downlink signal transmitted from the active pen on the basis of a capacitance occurring between the active pen and the touch electrode to generate first sensing data during a plurality of second touch sensing periods included in the one frame period, and a touch controller calculating pen data and pen touch coordinates of the active pen on the basis of the first sensing data generated during the second touch sensing period.