Shift Register Noise Reduction for In-Cell Touch Interference

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Solution Overview

Problem

The gate driver circuit in in-cell touch panels interferes with touch signals, adversely affecting the touch function of the display device.

Innovation Solution

A shift register unit with a precharging module, resetting module, pull-up control module, and noise reduction module is implemented, connected in a cascaded manner to prevent interference by charging and resetting nodes while performing noise reduction at specific stages, ensuring stable output signals during touch operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of manufacture

If a gate driver circuit is integrated into the display panel for in-cell touch panels, then production cost is reduced and manufacturing process is simplified, but the driving signal from the gate driver circuit interferes with the touch signal, adversely affecting the touch function

Engineering Contradiction:

Improvemanufacturing process simplicityVSAvoidsignal interference

Core Design Contradiction:

Ease of manufactureVSObject-affected harmful factors

Solution Approach 1:

The gate driver circuit is divided into multiple shift register units that are distributed across different regions of the display panel. Each shift register unit independently drives a specific region, which segments the overall driving signal and reduces interference with touch signals in any single region.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The noise reduction module extracts and removes interference components from the driving signal. By identifying and eliminating the harmful frequency components that interfere with touch signals, the circuit maintains both driving functionality and touch sensitivity.

Inventive Principle:

Principle #2Taking out (Extraction)

2Reliability

If the gate driver circuit is arranged in the display panel through integrated circuit units including TFTs, then production cost is reduced and yield is improved, but the driving signal interferes with touch signals

Engineering Contradiction:

Improvemanufacturing yieldVSAvoidtouch signal interference

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

Different regions of the display panel are assigned different functional characteristics. Regions with integrated circuit units are optimized for driving functions, while adjacent regions are optimized for touch sensing. This local differentiation allows both functions to coexist with minimal interference.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The noise reduction module acts as an intermediary between the driving signal and the touch signal. It processes the driving signal to remove harmful components before they can interfere with touch signal detection, thereby protecting the touch function while maintaining driving performance.

Inventive Principle:

Principle #24Intermediary (Mediator)

Data Source

PatentUS10268306B2Shift register unit, its driving method, gate driver circuit and display device

Publication Date: 2019.04.23 BOE TECHNOLOGY GROUP CO LTD

AI summary

A shift register unit is provided. The shift register unit includes a precharging module, a resetting module, a pull-up control module and a noise reduction module. The precharging module is connected to the resetting module and a pull-up node, the resetting module is connected to the pull-up node, the noise reduction module and an output end, the pull-up control module is connected to the pull-up node, the noise reduction module and the output end, and the noise output module is connected to the output end.