Grounded Noise Blocking Film for Touch-Sensitive Display Drivers

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Solution Overview

Problem

Existing display devices face issues with electromagnetic wave interference affecting the touch sensitivity of touch sensing units due to noise from display and touch driver circuits, and there is a need for improved circuit board design to efficiently block these waves.

Innovation Solution

A display device with a noise blocking film covering the driver circuits and a circuit board design that connects the film directly to a ground terminal without a level difference, using a noise blocking film made of anisotropic conductive material to block electromagnetic waves from display and touch driver circuits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Object-affected harmful factors

If a noise blocking film is used to block electromagnetic waves from driver circuits, then electromagnetic wave interference is reduced, but the device structure becomes more complex

Engineering Contradiction:

Improveelectromagnetic wave interferenceVSAvoiddevice structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The noise blocking film is integrated within the existing display device structure, nested between the circuit board and the front cover assembly. This nesting approach allows the noise blocking function to be incorporated without adding external components, thus reducing the impact on device complexity while effectively blocking electromagnetic waves from the driver circuits.

Inventive Principle:

Principle #7Nested doll (Nesting)

Solution Approach 2:

The patent employs a thin film noise blocking material that can be applied directly to the circuit board or positioned within the display assembly. This thin film approach provides effective electromagnetic wave blocking with minimal addition to the device structure, avoiding the need for bulky shielding materials or complex structural modifications.

Inventive Principle:

Principle #30Flexible shells and thin films

2Object-affected harmful factors

If the noise blocking film is connected to ground terminal with a level difference, then electromagnetic wave blocking is achieved, but manufacturing difficulty increases

Engineering Contradiction:

Improveelectromagnetic wave blockingVSAvoidmanufacturing difficulty

Core Design Contradiction:

Object-affected harmful factorsVSEase of manufacture

Solution Approach 1:

The noise blocking film is connected to the ground terminal through a ground connection structure that eliminates level differences, creating an equipotential connection. This approach ensures effective electromagnetic wave blocking by maintaining a consistent ground potential across the noise blocking film, while simplifying the manufacturing process by avoiding complex leveling or positioning mechanisms.

Inventive Principle:

Principle #12Equipotentiality

3Device complexity

If a traditional circuit board design is used, then device simplicity is maintained, but noise blocking efficiency is reduced

Engineering Contradiction:

Improvedevice simplicityVSAvoidnoise blocking efficiency

Core Design Contradiction:

Device complexityVSObject-affected harmful factors

Solution Approach 1:

The circuit board design incorporates localized ground connection areas and positioning structures specifically at the regions where the noise blocking film contacts the board. This local quality enhancement provides effective noise blocking where needed without requiring complex modifications to the entire circuit board design, thus maintaining overall device simplicity while improving noise blocking efficiency.

Inventive Principle:

Principle #3Local quality

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

The solution effectively blocks electromagnetic waves, preventing deterioration of touch sensitivity and improving the efficiency of noise blocking, while allowing easy application and disposition of the noise blocking film.

Implementation Method 1

a noise blocking film covering a driver unit, or driver, comprising the plurality of data driver circuits, the display driver circuit, and the touch driver circuit, and configured to block electromagnetic waves from the driver

Methodology Applied

Scientific EffectElectromagnetic wave blocking: Absorption (EM radiation)

Data Source

PatentUS20260029864A1Display device and electronic device using the same

Publication Date: 2026.01.29 SAMSUNG DISPLAY CO LTD

AI summary

A display device and an electronic device using the same are disclosed. A display device includes a display panel configured to display images through pixels in a display area, a touch driver circuit configured to detect a touch of a user through a touch sensor of the display panel and generate touch coordinate data, a plurality of data driver circuits configured to apply data voltage to the pixels in the display area, a display driver circuit configured to control driving timing of the plurality of data driver circuits and image display timing of the pixels, and a noise blocking film covering a driver including the plurality of data driver circuits, the display driver circuit, and the touch driver circuit, and configured to block electromagnetic waves from the driver.