Variable Mode Switch Frequency for Audible Noise Reduction

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Solution Overview

Problem

Electronic devices with display and touch sensing functions generate audible noise due to fixed mode switch frequencies between display and touch sensing modes, leading to a poor user experience.

Innovation Solution

Implementing a method to control electronic devices with different mode switch frequencies for switching between display and touch sensing modes, allowing for variable frequencies during different frame times to reduce noise peaks.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If the electronic device uses a fixed mode switch frequency for switching between display mode and touch sensing mode, then the operation is simple and stable, but large audible noise is generated causing poor user experience

Engineering Contradiction:

Improveaudible noiseVSAvoidmode switch frequency control

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The patent applies dynamics by making the mode switch frequency variable rather than fixed. The processing circuit dynamically adjusts the mode switch frequency based on frame timing, using different frequencies in different frames to reduce audible noise peaks while maintaining operational stability

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the parameter of mode switch frequency from a constant value to a variable value that changes between frames. By adjusting the frequency parameter dynamically, the system reduces audible noise without requiring complex additional hardware

Inventive Principle:

Principle #35Parameter changes

2Object-affected harmful factors

If the electronic device periodically switches between display mode and touch sensing mode with the same display time and touch sensing time in each frame, then the operation is consistent and simple, but large audible noise peaks are generated

Engineering Contradiction:

Improveaudible noise peaksVSAvoidmode switch frequency variation

Core Design Contradiction:

Object-affected harmful factorsVSAdaptability or versatility

Solution Approach 1:

The patent uses periodic action by implementing frame-based operation where the mode switch frequency varies from one frame to the next. This periodic variation in frequency breaks the consistent noise pattern that occurs with fixed frequencies, reducing audible noise peaks while maintaining the periodic structure needed for display and touch sensing operations

Inventive Principle:

Principle #19Periodic action

Data Source

PatentUS11282475B2Electronic device control method and electronic device applying the electronic device control method

Publication Date: 2022.03.22 HIMAX TECH LTD

AI summary

An electronic device control method applied to an electronic device can operate in a display mode and a touch sensing mode. The method comprises: (a) controlling the electronic device to have a first mode switch frequency; and (b) controlling the electronic device to have a second mode switch frequency different from the first mode switch frequency. The first mode switch frequency and the second mode switch frequency are frequencies for switching between the display mode and the touch sensing mode.