Touch Display Short Circuit Prevention Electrode Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing touch display devices face challenges in implementing touch electrodes inside the display panel without increasing thickness, and in efficiently disposing touch electrodes due to internal display driving electrodes.
Innovation Solution
A touch display device design that includes a substrate with subpixels having a light-emitting area and a transmissive area, where a touch electrode is disposed on the transmissive area, separated from the light-emitting element's second electrode, and a short circuit prevention electrode is positioned between them to surround the touch electrode, using a transparent material similar to the second electrode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the touch electrode is disposed on the display panel, then the touch sensing function is improved, but the overall thickness of the display device increases
Solution Approach 1:
The touch electrode is integrated inside the display panel structure, nested between the second electrode of the light-emitting element and the encapsulation layer. This nesting approach allows the touch electrode to be housed within the existing panel thickness without requiring additional external space, thereby maintaining thin profile while enabling touch sensing functionality.
Solution Approach 2:
Instead of placing the touch electrode on the external surface of the display panel (2D surface mounting), the invention transitions to a 3D internal arrangement by positioning the touch electrode within the layered structure of the panel, specifically in the vertical dimension between existing electrodes and encapsulation layers.
2Length of moving object
If the touch electrode is disposed inside the display panel, then the overall thickness is reduced, but it becomes difficult to dispose the touch electrode due to various internal electrodes for display driving
Solution Approach 1:
The display panel structure is segmented into distinct functional zones: the light-emitting element with its first and second electrodes, and the encapsulation layer. The touch electrode is strategically positioned in the space between the second electrode and encapsulation layer, creating a clear separation that simplifies the manufacturing process despite the internal placement.
Solution Approach 2:
The invention introduces an intermediary spatial zone between the second electrode of the light-emitting element and the encapsulation layer, where the touch electrode can be comfortably disposed. This intermediary space acts as a buffer zone that facilitates the integration of the touch electrode without interfering with the display driving electrodes.
3Length of moving object
If the touch electrode is placed close to the second electrode to save space, then the panel thickness is maintained, but short circuit between electrodes may occur
Solution Approach 1:
The harmful possibility of short circuit is extracted and eliminated by maintaining a deliberate spatial separation between the touch electrode and the second electrode. The touch electrode is positioned in the available space between the second electrode and encapsulation layer, ensuring sufficient insulation distance is preserved while still achieving compact overall thickness.
Data Source
AI summary
A touch display device can include a touch electrode implemented using a material and disposed on a transmissive area of a subpixel. The touch electrode can be disposed easily in a display panel which a transmittance is high. Furthermore, a short circuit prevention electrode can be disposed between a second electrode of a light-emitting element and the touch electrode to reduce a defect occurrence of the touch electrode in a process, and various types of touch sensing function can be provided or a performance of a touch sensing can be improved by using the short circuit prevention electrode as an electrode performing a certain function.