Organic Touch Encapsulation Layout for Foldable Display Bending
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Flexible display panels in foldable electronic devices suffer from stress and deformation issues during bending, leading to cracks and encapsulation failures, which result in display defects like black spots and black screens, and organic touch on encapsulation technology has a low yield rate due to high fluidity of new organic materials.
Innovation Solution
A display touch module with a first and second organic layer, each containing a metal layer with electrodes, where the electrodes are alternately arranged in perpendicular directions to form a touch integration layer, reducing the need for micro vias and minimizing signal disconnection risks, and using an organic encapsulation layer to enhance deformation capability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If inorganic encapsulation layer is used, then manufacturing precision is improved, but bending deformation capability deteriorates
Solution Approach 1:
The patent changes the material parameter of the encapsulation layer from inorganic to organic material. This parameter change enables the encapsulation layer to have better flexibility and deformation capability, allowing it to withstand bending stresses without cracking while maintaining manufacturing precision through controlled organic layer formation processes.
Solution Approach 2:
The patent employs a composite structure combining organic encapsulation material with the display panel and touch sensor layers. This composite approach allows the organic material to provide both the necessary mechanical flexibility for bending applications and the encapsulation function to protect internal layers, resolving the contradiction between rigidity and flexibility.
2Adaptability or versatility
If organic touch on encapsulation is used, then bending deformation capability is improved, but yield rate deteriorates
Solution Approach 1:
The patent segments the touch sensor electrodes into two separate metal layers (first metal layer and second metal layer) positioned at different depths within the organic encapsulation layer. This segmentation eliminates the need for extensive micro-via connections that previously caused yield issues, while the organic material's high fluidity is utilized to create a smooth, continuous encapsulation structure that maintains reliability.
Solution Approach 2:
The patent transitions from a planar single-layer electrode design to a three-dimensional multi-layer electrode structure. By stacking the first and second metal layers vertically within the organic encapsulation, the design reduces the need for lateral micro-via connections, thereby improving yield rate while maintaining the organic material's bending deformation advantages.
3Device complexity
If first electrodes and second electrodes are disposed at the same layer, then device complexity is reduced, but signal disconnection risk increases
Solution Approach 1:
The patent resolves the contradiction by moving the electrodes from a two-dimensional same-layer arrangement to a three-dimensional multi-layer configuration. The first metal layer and second metal layer are positioned at different vertical levels within the organic encapsulation, with projections alternately arranged in perpendicular directions. This vertical separation eliminates the need for micro-via bridging, reducing both complexity and signal disconnection risk simultaneously.
Data Source
Figure 1~2
Figure 3
Figure 4~5
AI summary
This application discloses a display touch module and an electronic device. The display touch module includes a display panel, a first organic layer disposed on the display panel, and a second organic layer disposed on the first organic layer. The display touch module further includes a first metal layer and a second metal layer. The first metal layer is disposed in the first organic layer, and the second metal layer is disposed in the second organic layer. In comparison with using an inorganic layer, the display touch module has a better deformation capability. The first metal layer includes first electrodes, the second metal layer includes second electrodes, and the first electrodes and the second electrodes are configured to output a first signal when a touch operation is detected. No via is required for bridging, to reduce a risk of signal disconnection caused by a via residue. Projections of the first electrodes on the second metal layer and the second electrodes are alternately arranged in a first direction and a second direction respectively, the first direction is perpendicular to the second direction, and the arrangement is in a checkerboard manner, to reduce a drive load of a touch control module.