Variable Thickness Insulating Layer for Touch Display Noise Reduction

Solution Overview

Problem

Display devices with touch sensors face reliability and performance issues due to noise interference from the display panel, which affects the sensing sensitivity of the touch sensor.

Innovation Solution

The display device incorporates a touch array on the display panel with an insulating layer of varying thicknesses in different sub-areas, optimized based on noise levels caused by electrical signals, to minimize noise interference and enhance touch sensing reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Adaptability or versatility

If a touch sensor is attached to or manufactured with the display panel, then touch input recognition is enabled, but noise from the display panel degrades touch sensor sensing sensitivity

Engineering Contradiction:

Improvetouch input recognitionVSAvoidtouch sensor sensing sensitivity

Core Design Contradiction:

Adaptability or versatilityVSReliability

Solution Approach 1:

The display area is divided into multiple sub-areas (first, second, and third sub-areas) with different insulating layer thicknesses. This segmentation allows each region to be optimized for its specific noise characteristics, thereby reducing overall noise impact on the touch sensor while maintaining touch recognition functionality across the entire display.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel are assigned different insulating layer thicknesses based on their specific noise levels. The second sub-area has a thicker insulating layer than the first and third sub-areas, creating local quality variations that selectively attenuate noise in high-noise regions while preserving signal integrity in lower-noise regions.

Inventive Principle:

Principle #3Local quality

2Ease of manufacture

If the insulating layer has uniform thickness across the display area, then manufacturing is simplified, but noise levels vary across different sub-areas affecting touch sensor performance

Engineering Contradiction:

Improveinsulating layer fabricationVSAvoidnoise level uniformity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The display area is divided into multiple sub-areas (first, second, and third sub-areas) with different insulating layer thicknesses. This segmentation allows each region to be optimized for its specific noise characteristics, thereby reducing overall noise impact on the touch sensor while maintaining touch recognition functionality across the entire display.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel are assigned different insulating layer thicknesses based on their specific noise levels. The second sub-area has a thicker insulating layer than the first and third sub-areas, creating local quality variations that selectively attenuate noise in high-noise regions while preserving signal integrity in lower-noise regions.

Inventive Principle:

Principle #3Local quality

3Object-affected harmful factors

If the insulating layer thickness is increased to reduce noise, then noise levels decrease, but the display panel structure becomes more complex

Engineering Contradiction:

Improvenoise levelsVSAvoidinsulating layer structure

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The display area is divided into multiple sub-areas (first, second, and third sub-areas) with different insulating layer thicknesses. This segmentation allows each region to be optimized for its specific noise characteristics, thereby reducing overall noise impact on the touch sensor while maintaining touch recognition functionality across the entire display.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

Different regions of the display panel are assigned different insulating layer thicknesses based on their specific noise levels. The second sub-area has a thicker insulating layer than the first and third sub-areas, creating local quality variations that selectively attenuate noise in high-noise regions while preserving signal integrity in lower-noise regions.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250021197A1Display device

Publication Date: 2025.01.16 SAMSUNG DISPLAY CO LTD

AI summary

A display device including: a display panel including a display area; and a touch array disposed on the display panel, wherein the display panel includes: a substrate; transistors disposed on the substrate; an insulating layer covering first electrodes and second electrodes of the transistors; light emitting elements disposed on the insulating layer, the light emitting elements being electrically connected to the first electrodes of the transistors; and a thin film encapsulation layer covering the light emitting elements, wherein the display area is divided into a plurality of sub-areas, and wherein the insulating layer has different thicknesses in the plurality of sub-areas.