Auxiliary Electrode Storage Capacitance for Touch Display Integration
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Solution Overview
Problem
Existing self-capacitive touch display devices have a poor display effect due to low storage capacitance between the pixel electrode and the common electrode, which affects the integration of touch and display functions.
Innovation Solution
An auxiliary electrode is added, insulated from and overlapping with the pixel electrode, and electrically connected to the common electrode, increasing storage capacitance by forming capacitance between the auxiliary and pixel electrodes, thus enhancing the display effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the common electrode serves as the touch sensing electrode in self-capacitive touch display integrated technology, then the fabrication cost is reduced and productivity is improved, but the display effect deteriorates due to poor storage capacitance
Solution Approach 1:
The electrode structure is segmented into pixel electrodes, common electrodes, and auxiliary electrodes. The auxiliary electrodes are specifically added to work with common electrodes to generate storage capacitance, while the pixel electrodes maintain touch sensing function. This segmentation allows different electrode groups to perform specialized functions, resolving the contradiction between integrated touch-display functionality and display quality.
Solution Approach 2:
The auxiliary electrodes act as an intermediary element between the pixel electrodes and common electrodes. They mediate the electrical field distribution and capacitance generation, enabling the common electrode to serve dual purposes as both display electrode and touch sensing electrode while maintaining adequate storage capacitance for display performance.
2Adaptability or versatility
If the common electrode layer is divided into multiple separate touch electrodes for time-division control, then touch and display functions are achieved synchronously, but the storage capacitance decreases leading to poor display effect
Solution Approach 1:
The electrode system is divided into functionally distinct segments: pixel electrodes for touch sensing, common electrodes for display and touch control, and auxiliary electrodes specifically for capacitance generation. This segmentation enables time-division multiplexing of touch and display operations while the auxiliary electrodes compensate for the reduced storage capacitance that would otherwise result from dividing the common electrode layer.
Solution Approach 2:
The auxiliary electrodes are positioned in a different conductive layer from the pixel electrodes, creating a three-dimensional electrode architecture. This dimensional arrangement allows the auxiliary electrodes to overlap with pixel electrodes and generate storage capacitance without interfering with the planar touch sensing operation, enabling both touch-display integration and adequate display performance.
3Length of stationary object
If touch sensing electrode is integrated within the panel using self-capacitive technology, then the panel thickness is reduced, but the storage capacitance is insufficient affecting display quality
Solution Approach 1:
The auxiliary electrodes are nested within the multi-layer electrode structure of the integrated touch-display panel. They are positioned in conductive layers between the substrate and the pixel electrodes, utilizing the existing panel thickness efficiently. This nesting approach adds storage capacitance functionality without requiring additional panel thickness, as the auxiliary electrodes share the same vertical space as other electrode layers.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The increased storage capacitance improves the display effect of the display device by synchronizing touch and display operations, reducing the panel's thickness and fabrication costs.
Implementation Method 1
the auxiliary electrode, which is insulated from and overlaps with the pixel electrode, and the auxiliary electrode is electrically connected to the common electrode. Because storage capacitance is a sum of a capacitance between the auxiliary electrode and the pixel electrode, and also is a capacitance between the common electrode and the pixel electrode, the storage capacitance is increased
Data Source
AI summary
An array substrate, a display panel and a display device are provided. The array substrate includes: multiple gate lines and multiple data lines, where the gate lines are insulated from and intersect with the data lines, which define multiple pixel units; a pixel electrode layer, where the pixel electrode layer includes multiple pixel electrodes, and the pixel electrodes are disposed in the pixel units; a common electrode layer, where the common electrode layer includes multiple common electrodes, and the common electrode serves as a touch electrode; and multiple auxiliary electrodes, where the auxiliary electrode is electrically connected to the touch electrode, is disposed in a different conductive layer from the pixel electrode, and overlaps with at least one of the pixel electrodes. In this way, the storage capacitance is increased, and the display device has an improved display effect as compared with the conventional technology.