Touch Panel Driving Code Matrix for Higher SNR Detection

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Solution Overview

Problem

Conventional touch panels using Hadamard or Walsh-Hadamard matrices for modulating/demodulating touch signals suffer from signal distortion and degraded signal-to-noise ratio due to excessive arithmetic sums in the first column codes, leading to mismatched sampling and reduced SNR.

Innovation Solution

A modified driving code matrix of order 2n-1 is introduced, where each column sum is equal to 1, using codes of +1 and -1, to stabilize and reduce the amplitude of sensing signals, thereby minimizing sampling distortion and improving the signal-to-noise ratio.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If Hadamard or Walsh-Hadamard matrix is used for modulating/demodulating touch signals, then multiple access capability is achieved, but signal distortion occurs and signal-to-noise ratio deteriorates due to excessive arithmetic sums in the first column codes

Engineering Contradiction:

Improvemultiple access capabilityVSAvoidsignal-to-noise ratio

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The patent modifies the driving code matrix by changing the code values in the first column from all +1 to alternating +1 and -1 patterns. This parameter change in the code structure reduces the arithmetic sum from excessive values to controlled values, thereby reducing sampling distortion and improving signal-to-noise ratio while maintaining multiple access capability

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

Instead of using all +1 codes in the first column as in conventional Hadamard matrices, the patent inverts some codes to -1 in specific positions. This inversion strategy creates a balanced code structure where the arithmetic sum is controlled, resolving the signal distortion problem while preserving the orthogonal properties needed for multiple access

Inventive Principle:

Principle #13The other way round (Inversion)

2Device complexity

If conventional Hadamard matrix with all +1 codes in first column is used, then matrix structure is simple, but sampling distortion increases due to excessive arithmetic sums

Engineering Contradiction:

Improvematrix structure simplicityVSAvoidsampling accuracy

Core Design Contradiction:

Device complexityVSManufacturing precision

Solution Approach 1:

The patent changes the code parameters in the first column from uniform +1 values to alternating +1 and -1 values. This simple parameter modification maintains the overall matrix structure while controlling the arithmetic sum, thereby reducing sampling distortion without significantly increasing system complexity

Inventive Principle:

Principle #35Parameter changes

Data Source

PatentUS20260010261A1Touch control method, touch control circuit, and touch panel

Publication Date: 2026.01.08 FITIPOWER INTEGRATED TECH SHENZHEN INC

AI summary

A touch control method applied to a touch panel including a plurality of driving electrodes and a plurality of sensing electrodes intersect to form a plurality of touch nodes. The touch control method includes: receiving a driving code matrix of 2n-1 order comprising a plurality of codes corresponding to the plurality of touch nodes; sending a plurality of driving signals to the plurality of driving electrodes simultaneously according to the driving code matrix; and receiving a sensing code matrix generated by the plurality of sensing electrodes based on the plurality of driving signals, wherein the sensing code matrix is configured to obtain a touch position. A computer-readable storage medium, a touch control circuit, and a touch panel are further provided.