Capacitive In-Cell Touch Screen Panel with Broken Line Electrodes
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Solution Overview
Problem
Capacitive in-cell touch screen panels have low sensing sensitivity due to the small mutual capacitance between traditional straight-line touch driving and sensing electrodes, leading to inadequate voltage signal changes when a human body contacts the panel, which increases manufacturing costs and reduces production efficiency.
Innovation Solution
The capacitive touch module features a common electrode layer with touch sensing and driving electrodes that are insulated from each other, where each electrode is split into sub-electrodes with broken line structures on opposing sides, increasing the mutual capacitance area and improving sensitivity by applying common electrode signals during display intervals and touch scanning signals during touch intervals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional straight-line touch driving and sensing electrodes are used, then the manufacturing process is simple, but the mutual capacitance is small leading to low sensing sensitivity
Solution Approach 1:
The patent applies curvature by changing the electrode edges from straight lines to arc-shaped curves. The touch driving electrode and touch sensing electrode both feature arc-shaped edges that face each other, creating a curved geometric configuration that increases the mutual capacitance area compared to traditional straight-line electrodes, thereby improving sensing sensitivity.
Solution Approach 2:
The patent segments the electrode structure by dividing each electrode into multiple sub-electrodes (first touch driving sub-electrodes, second touch driving sub-electrodes, first touch sensing sub-electrodes, second touch sensing sub-electrodes). This segmentation allows for optimized arrangement and increased interaction area between driving and sensing components, enhancing mutual capacitance while maintaining manageable complexity.
2Adaptability or versatility
If new film layers are additionally arranged on traditional array substrate, then touch function is achieved, but manufacturing cost increases and production efficiency decreases
Solution Approach 1:
The patent merges the touch screen electrode layer with the LCD common electrode layer into a single integrated structure. The touch driving electrodes and touch sensing electrodes are formed within the same common electrode layer that serves both display and touch sensing functions, eliminating the need for separate touch electrode layers and reducing manufacturing complexity to improve production efficiency.
Solution Approach 2:
The common electrode layer is designed to serve multiple functions: it acts as the common electrode for LCD display operation and simultaneously contains both touch driving electrodes and touch sensing electrodes. This multi-functionality allows a single layer to fulfill both display and touch sensing requirements, reducing the number of additional film layers needed and improving manufacturing efficiency.
3Adaptability or versatility
If common electrode layer is split into touch sensing and driving electrodes, then touch function is integrated, but manufacturing process complexity increases
Solution Approach 1:
The patent employs time-division multiplexing where the common electrode layer alternates between display mode and touch sensing mode. During display intervals, common electrode signals are applied; during touch intervals, touch scanning signals are applied to driving electrodes while sensing electrodes detect mutual capacitance changes. This periodic switching allows dual functionality without requiring physically separate electrode systems, simplifying manufacturing.
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 design enhances the sensing sensitivity of the touch screen panel by increasing mutual capacitance between touch driving and sensing electrodes, allowing for more precise detection of contact points and reducing manufacturing costs through improved production efficiency.
Implementation Method 1
Mutual capacitance is formed between the touch sensing electrodes and the touch driving electrodes... voltage signals generated by coupling of the touch sensing electrodes through the mutual capacitance are detected
Implementation Method 2
where a human body contacts the touch screen panel, the electric field of the human body acts on the mutual capacitance, so that the capacitance value of the mutual capacitance is changed
Data Source
AI summary
The present invention discloses a capacitive touch module, a capacitive in-cell touch screen panel and a display device, in which an integrally connected common electrode layer in an array substrate is split to form touch sensing electrodes and touch driving electrodes which are insulated from each other; and the touch driving electrodes and the touch sensing electrodes are subjected to time-sharing drive to achieve the touch function and the display function. Moreover, each touch sensing electrode includes a plurality of touch sensing sub-electrodes; each touch driving electrode includes a plurality of touch driving sub-electrodes; and opposing sides of adjacent touch sensing sub-electrodes and touch driving sub-electrodes are broken lines. Therefore, the opposing area between the adjacent touch driving electrodes and the adjacent touch sensing electrodes can be increased, and hence the mutual capacitance between the touch driving electrodes and the touch sensing electrodes within the unit area can be increased, and consequently the sensing sensitivity of the touch screen in the touch-control process can be improved.