Display Panel Transition Region Encapsulation and Mesh Electrode Design

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Solution Overview

Problem

Existing touch panels face challenges in achieving high touch control accuracy and preventing issues like short circuits and line breaks in the transition regions due to uneven encapsulating layers and mesh electrode fabrication difficulties.

Innovation Solution

A display panel design featuring a base substrate with thin film transistors and display elements, an encapsulating layer with varying thickness in different regions, and a touch electrode layer with mesh electrodes of varying line widths, which are thicker in transition regions to mitigate fabrication issues and ensure accurate touch control.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the encapsulating layer and mesh electrodes are fabricated in the transition region with standard thickness, then the manufacturing process is simplified, but short circuits and line breaks occur due to uneven encapsulation and fabrication difficulties

Engineering Contradiction:

Improveprevention of short circuits and line breaksVSAvoidfabrication difficulty in transition region

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent applies local quality by making the encapsulating layer and mesh electrodes have different thicknesses in different regions. Specifically, the encapsulating layer has a first thickness in the display region and a second thickness in the transition region, where the second thickness is greater than the first thickness. Similarly, mesh electrodes have a first line width in the display region and a second line width in the transition region, where the second line width is greater than the first line width. This local differentiation resolves the contradiction by providing enhanced reliability in the transition region without compromising the simplicity of manufacturing in the display region.

Inventive Principle:

Principle #3Local quality

2Measurement precision

If the mesh electrodes have uniform line width across all regions, then the fabrication process is easier, but touch control accuracy decreases in transition regions

Engineering Contradiction:

Improvetouch control accuracyVSAvoidmesh electrode fabrication complexity

Core Design Contradiction:

Measurement precisionVSEase of manufacture

Solution Approach 1:

The patent implements local quality by defining different line widths for mesh electrodes in different regions. The mesh electrodes have a first line width in the display region and a second line width in the transition region, with the second line width being greater than the first line width. This regional differentiation enhances touch control accuracy in the transition region where thicker electrodes provide better signal detection, while maintaining easier fabrication in the display region where standard thin-film processes apply.

Inventive Principle:

Principle #3Local quality

3Measurement precision

If the encapsulating layer has uniform thickness, then the manufacturing process is simpler, but touch control accuracy and reliability are compromised in transition regions

Engineering Contradiction:

Improvetouch control accuracyVSAvoidencapsulating layer structure complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent applies local quality by creating an encapsulating layer with varying thickness across different regions. The encapsulating layer has a first thickness in the display region and a second thickness in the transition region, where the second thickness is greater than the first thickness. This regional variation improves touch control accuracy and reliability in the transition region by providing better encapsulation and electrical isolation, while maintaining a relatively simple structure in the display region.

Inventive Principle:

Principle #3Local quality

4Reliability

If thicker mesh electrodes are used in transition regions, then fabrication issues like line breaks are prevented, but the overall device complexity increases

Engineering Contradiction:

Improveprevention of line breaksVSAvoidvarying mesh electrode line widths

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent implements local quality by specifying that mesh electrodes have a first line width in the display region and a second line width in the transition region, where the second line width is greater than the first line width. This localized thickening in the transition region prevents line breaks and fabrication issues in the critical transition area, while maintaining the standard thin-film structure in the display region, thus limiting the increase in overall device complexity to only where necessary.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250077013A1Display panel and display apparatus

Publication Date: 2025.03.06 MIANYANG BOE OPTOELECTRONICS TECH CO LTD

AI summary

A display panel is provided. In a display region configured to display an image, the display panel includes a base substrate; thin film transistors and display elements on the base substrate; an encapsulating layer encapsulating the display elements; and a touch electrode layer including mesh electrodes on a side of the encapsulating layer away from the base substrate. The encapsulating layer includes at least an organic encapsulating sub-layer having a first thickness in at least a sub-region of the transition region, and a second thickness in the display region. The first thickness is smaller than the second thickness. The sub-region at least partially surrounds the first window region. A thickness of the organic encapsulating sub-layer in the sub-region of the transition region gradually decreases along a direction from the sub-region of the transition region toward the first window region.