Touch Electrode Phase Compensation in Integrated Display Panels

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Solution Overview

Problem

Display devices with integrated touch panels experience noise interference from the driving signals of the display panel, leading to reduced touch sensitivity.

Innovation Solution

A display device design that includes a touch panel with a driving circuit unit supplying data signals and compensation signals with opposite phases to mitigate noise interference, thereby enhancing touch sensitivity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a touch panel is integrated with a display panel, then the device structure is simplified and functionality is enhanced, but noise interference occurs from display panel driving signals to the touch panel, reducing touch sensitivity

Engineering Contradiction:

Improveintegrated functionalityVSAvoidnoise interference

Core Design Contradiction:

Adaptability or versatilityVSObject-affected harmful factors

Solution Approach 1:

The patent applies the principle of converting harm into benefit by using the display panel driving signals, which are originally harmful noise sources, to generate compensation signals that actively cancel out the interference. The driving signals are routed through the touch panel electrodes to create equal and opposite phase signals that neutralize the noise, thereby transforming the harmful interference into a beneficial noise-cancellation mechanism.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The patent changes the phase parameter of the driving signals by introducing a phase inverter that flips the signal phase by 180 degrees. This parameter change transforms the original harmful signals into compensation signals with opposite phases, enabling them to cancel each other out when combined, thus eliminating the noise interference while maintaining the integrated structure.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If data signals are supplied to both display panel and touch panel, then both functions operate, but the same signals cause noise in the touch panel, reducing sensitivity

Engineering Contradiction:

Improveoperational functionalityVSAvoidtouch sensitivity

Core Design Contradiction:

ProductivityVSMeasurement precision

Solution Approach 1:

The patent implements feedback by using the original driving signals as a reference to generate compensation signals. The phase inverter processes the driving signals to create equal and opposite phase signals that are fed back into the touch panel electrodes, continuously canceling out the noise interference in real-time during operation.

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent introduces a phase inverter as an intermediary component between the driving circuit and the touch panel electrodes. This intermediary generates compensation signals by inverting the phase of the driving signals, acting as a mediator that transforms harmful interference into beneficial cancellation signals without disrupting the normal operation of either panel.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS20260079597A1Display device

Publication Date: 2026.03.19 LG DISPLAY CO LTD

AI summary

A display device includes a driving circuit unit supplies a plurality of data signals to a plurality of pixel driving circuits and supplies a data compensation signal to a plurality of touch electrodes, and the data compensation signal and the plurality of data signals have opposite phases to each other.