Display Apparatus Touch Electrode Layout for Arc Suppression
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing display apparatuses face limitations in the disposition of touch electrodes, which affect touch sensing performance and stability, particularly in electroluminescent displays.
Innovation Solution
The touch sensing unit is positioned between the encapsulation layer and the color filter layer, with touch electrodes disposed under the black matrix, and bridge electrodes with lower metal density are used to connect these electrodes, while dummy electrodes are added to enhance stability and performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes are disposed in conventional locations, then the display structure is simple, but the degree of freedom in electrode disposition is limited and touch sensing performance is reduced
Solution Approach 1:
The touch electrodes are repositioned from conventional surface locations to the space between the encapsulation layer and color filter layer, utilizing the vertical dimension of the display structure. This spatial relocation enables greater freedom in electrode disposition while maintaining structural integrity through the black matrix framework.
Solution Approach 2:
The touch electrodes are nested within the existing display layer structure, specifically positioned under the black matrix and between the encapsulation layer and color filter layer. This nesting approach integrates the touch sensing function into the conventional display architecture without requiring separate external components.
2Reliability
If metal density is increased to enhance touch sensing performance, then arc occurrence increases between inorganic layer and touch electrodes
Solution Approach 1:
Different regions of the electrode structure are assigned different metal densities. The touch electrodes have high metal density to maximize sensing performance, while the bridge electrodes have relatively lower metal density to prevent arc formation. This localized differentiation of material properties resolves the contradiction between performance and safety.
Solution Approach 2:
Bridge electrodes with lower metal density serve as intermediary components connecting the high-density touch electrodes. These intermediate structures reduce the overall metal density in critical areas where arcs are most likely to occur, thereby preventing arc formation while still enabling electrical connectivity.
3Reliability
If touch electrode lines are made wider to increase metal density, then manufacturing precision requirements increase
Solution Approach 1:
Instead of uniformly increasing all electrode line widths, the invention selectively adjusts the width parameter of touch electrode lines in specific regions where high metal density is beneficial for sensing, while maintaining narrower widths in other areas. This selective parameter optimization achieves enhanced performance without proportionally increasing manufacturing complexity.
Data Source
AI summary
Disclosed is a display apparatus that includes a substrate having a display area and a non-display area adjacent to the display area. The display apparatus includes a light emitting element layer disposed on the substrate in the display area. The display apparatus includes an encapsulation layer disposed on the light emitting element layer. The display apparatus includes a touch sensing layer disposed on the encapsulation layer. The display apparatus includes a color filter layer disposed on the touch sensing layer. The display apparatus includes a gate driving circuit provided on the substrate in the non-display area. The display apparatus includes a dam disposed on the substrate in the non-display area and around the display area. The display apparatus includes a panel crack detector disposed at an edge portion of the substrate in the non-display area. The dam is located between the gate driving circuit and the panel crack detector.