Self-Capacitive Touch Panel Electrode Segmentation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In self-capacitive touch panels, the overlap between touch electrodes and data lines forms coupling capacitors, leading to high loads on touch electrodes, which affects touch detection efficiency and can cause display non-uniformity, especially in high Pixels Per Inch (PPI) displays.
Innovation Solution
The touch electrodes and data lines are arranged such that their projections do not overlap, with common electrodes insulated from touch electrodes and overlapping with data lines, reducing the capacitance of coupling capacitors and allowing touch electrodes to be reused as common electrodes during display periods, thereby lowering the load on touch electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If touch electrodes and data lines are arranged to overlap, then the touch panel structure is simplified and manufacturing is easier, but coupling capacitors are formed causing high load on touch electrodes and affecting touch detection efficiency
Solution Approach 1:
The patent segments the electrode structure by separating touch electrodes and common electrodes into different layers. Touch electrodes are placed in a first layer while common electrodes are placed in a second layer, preventing overlap with data lines and eliminating coupling capacitors that would form if they were in the same layer. This segmentation resolves the contradiction by maintaining manufacturing simplicity while improving touch detection efficiency.
2Device complexity
If touch electrodes are reused as common electrodes in display period, then device complexity is reduced, but load on touch electrodes increases affecting charging speed
Solution Approach 1:
The patent resolves the contradiction by transitioning to another dimension - separating electrodes vertically into different layers. Touch electrodes in the first layer and common electrodes in the second layer allow the touch electrode to be reused as common electrode during display period without increasing horizontal overlap or load. This dimensional separation maintains device complexity reduction while preserving charging speed.
3Object-generated harmful factors
If common electrodes are insulated from touch electrodes, then coupling capacitors are reduced, but electrode arrangement complexity increases
Solution Approach 1:
The patent segments electrodes into distinct layers - touch electrodes in the first layer and common electrodes in the second layer - which automatically provides insulation and eliminates coupling capacitors. This segmentation approach reduces coupling capacitor capacitance while actually simplifying the arrangement process compared to complex insulation structures within the same layer.
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
This arrangement reduces the load on touch electrodes, improving touch signal scanning frequency and detection effectiveness, and enhances display uniformity in high PPI displays by ensuring quicker charging of touch electrodes.
Implementation Method 1
the overlap between touch electrodes and data lines forms coupling capacitors, leading to high loads on touch electrodes
Data Source
AI summary
Disclosed are a self-capacitive touch panel and a display device. The self-capacitive touch panel includes a display area including a plurality of data lines, touch electrodes and common electrodes, wherein orthographic projections of the touch electrodes and the data liens onto the self-capacitive touch panel are not overlapped with each other; the common electrodes are arranged at a layer same as a layer on which the touch electrodes are and insulated from the touch electrodes, and orthographic projections of the common electrodes and the data lines onto the self-capacitive touch panel are overlapped with each other.