Display-Aware Touch Panel Sensing for Periodic Noise Interference

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Solution Overview

Problem

Touch sensing operations on touch panels are often interfered with by noises generated from display operations, as the touch control circuit lacks information about display data, making it difficult to effectively manage these interferences.

Innovation Solution

The driver circuit, integrated with both display and touch functions, predicts potential display noise by analyzing display data to adjust touch sensing operations accordingly, including determining periodicity, frequency, and applying filters to minimize interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If touch sensing operations are performed on the touch panel, then touch control functionality is achieved, but display-generated noises interfere with sensing accuracy

Engineering Contradiction:

Improvetouch sensing accuracyVSAvoiddisplay noise interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The touch control circuit obtains display information (such as display data, periodicity, frequency) from the display part before performing touch sensing operations. This preliminary acquisition of display information enables the touch part to predict and compensate for noise interference in advance, thereby improving touch sensing accuracy without sacrificing display functionality

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The display part provides feedback information about its operating state (display data, periodicity, frequency) to the touch control circuit. This feedback mechanism allows the touch part to adjust its sensing operations based on the current display state, effectively reducing noise interference while maintaining both display and touch functions

Inventive Principle:

Principle #23Feedback

2Device complexity

If the touch control circuit operates independently without display information, then circuit simplicity is maintained, but noise compensation is impossible

Engineering Contradiction:

Improvecircuit structureVSAvoidtouch sensing precision

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The display part and touch control circuit are integrated into a unified system where the display part shares its operating information (display data, periodicity, frequency) with the touch control circuit. This merging allows the touch part to access display information without requiring a completely separate complex circuit, achieving noise compensation while maintaining reasonable system integration

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The display part serves dual purposes: it not only performs display functions but also provides timing and noise characteristic information to the touch control circuit. This multi-functionality allows the same display infrastructure to support both display operations and touch noise compensation, reducing overall system complexity

Inventive Principle:

Principle #6Universality (Multi-functionality)

Data Source

PatentUS20260023450A1Touch control method based on display information

Publication Date: 2026.01.22 NOVATEK MICROELECTRONICS CORP

AI summary

A method of controlling a touch panel for a driver circuit, which has a display part and a touch part, includes steps of: generating, by the display part, a display information according to a plurality of display data for the touch panel; receiving, by the touch part, the display information from the display part; and performing, by the touch part, a touch sensing operation according to the display information.