Capacitive In-Cell Touch Panel Signal Isolation
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Solution Overview
Problem
Current capacitive in-cell touch panels experience mutual interference between display signals and touch control signals, affecting the quality of liquid crystal display pictures and the reliability of touch control operations.
Innovation Solution
A capacitive in-cell touch panel is designed with a transparent touch sensing structure layer on an opposite substrate, comprising a first and second touch sensing electrode in the same layer, mutually insulated, where one electrode is loaded with touch control scanning signals and the other couples and outputs these signals, thereby avoiding interference with the array substrate's display signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch control scanning lines and sensing lines are added on the TFT array substrate, then in-cell touch panel functionality is achieved, but mutual interference between display signals and touch control signals occurs
Solution Approach 1:
The invention divides the touch sensing function into two separate electrode layers: a first touch sensing electrode layer and a second touch sensing electrode layer. This segmentation allows the touch control signals to be transmitted through one layer while the sensing is performed by the other layer, preventing signal interference and enabling in-cell touch panel functionality without compromising signal reliability.
2Adaptability or versatility
If two layers of non-coplanar intersecting electrodes are manufactured, then capacitive touch sensing is achieved, but manufacturing complexity increases
Solution Approach 1:
The invention extracts the touch sensing function from the traditional non-coplanar intersecting electrode structure and relocates it to a separate transparent electrode layer. This extraction simplifies the manufacturing process by eliminating the need to create complex three-dimensional non-coplanar electrode intersections within the TFT substrate, while still achieving capacitive touch sensing functionality.
3Volume of moving object
If touch control electrodes are embedded in the liquid crystal display, then module thickness is reduced, but signal interference with display signals occurs
Solution Approach 1:
The invention introduces a transparent electrode layer as an intermediary between the TFT array substrate and the liquid crystal layer. This intermediary layer carries the touch control signals without interfering with the display signals in the TFT substrate, while still achieving the thickness reduction benefits of in-cell integration. The transparent nature of this intermediary layer ensures optical transparency and signal isolation.
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 ensures the quality of liquid crystal display pictures and increases the reliability of touch control operations by isolating touch control signals from display signals, simplifying the structure and reducing manufacturing costs.
Implementation Method 1
one of the first touch sensing electrode and the second touch sensing electrode is configured to be loaded with touch control scanning signals, and the other of the first touch sensing electrode and the second touch sensing electrode is configured to couple the touch control scanning signals and output
Data Source
AI summary
Embodiments of the present invention disclose a capacitive in-cell touch panel and a display device, with a touch sensing structure layer disposed on a side of an opposite substrate opposite to an array substrate, which side faces a liquid crystal layer; the touch sensing structure layer comprises a first touch sensing electrode and a second touch sensing electrode that are disposed in a same layer and mutually insulated; one of the first touch sensing electrode and the second touch sensing electrode is configured to be loaded with touch control scanning signals, and the other of the first touch sensing electrode and the second touch sensing electrode is configured to couple the touch control scanning signals and output. The touch sensing structure layer is provided on the opposite substrate that is away from the array substrate, which can avoid the mutual interference between touch control signals and display signals in the array substrate.