Shielding Pattern Between Data and Touch Lines
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Solution Overview
Problem
The performance of touch sensing in display devices is degraded due to parasitic capacitance generated between electrodes and lines for driving the display and those for touch sensing, leading to noise interference.
Innovation Solution
A touch display panel design that includes a shielding pattern in the non-active area between data link lines and touch link lines, which are electrically connected to the driving circuit, to reduce parasitic capacitance and noise, allowing for simultaneous touch sensing and display driving without additional process steps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If electrodes and signal lines are arranged on the display panel to provide display driving function, then display driving capability is improved, but parasitic capacitance is generated between display electrodes/lines and touch electrodes/lines which degrades touch sensing performance
Solution Approach 1:
A shielding pattern is introduced as an intermediary element between the display signal lines and touch sensing electrodes. This shielding pattern acts as a mediator that blocks or reduces the parasitic capacitance coupling between the two systems, allowing both display driving and touch sensing to coexist with minimal interference
Solution Approach 2:
The harmful parasitic capacitance effect is extracted and isolated by introducing a dedicated shielding structure. The shielding pattern separates the electric fields of display and touch systems, removing the detrimental interaction between them while preserving the necessary functionality of both systems
2Measurement precision
If shielding structures are added to reduce parasitic capacitance, then touch sensing performance is improved, but device complexity and manufacturing process steps increase
Solution Approach 1:
The shielding pattern is designed to serve multiple functions: it reduces parasitic capacitance for touch sensing, maintains display driving performance, and can be integrated with existing pixel electrode structures. This multi-functionality reduces the need for separate dedicated shielding structures
Solution Approach 2:
The shielding pattern is merged with existing display panel structures, particularly integrating it with the pixel electrode layout and non-active area structures. This combination approach allows the shielding function to be achieved without adding completely separate structural elements
3Object-affected harmful factors
If shielding pattern is disposed between data link lines and touch link lines, then parasitic capacitance noise is reduced, but manufacturing process complexity increases
Solution Approach 1:
The shielding function is segmented and distributed along the link lines rather than using a single continuous shield. The shielding pattern is divided into multiple sections positioned at strategic locations where parasitic capacitance coupling occurs, reducing noise effectively while minimizing material usage and process complexity
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 shielding pattern effectively reduces noise from parasitic capacitance, enhancing touch sensing performance and enabling simultaneous touch sensing and display driving without degrading the display driving functionality.
Implementation Method 1
the performance of the touch sensing may be degraded due to the parasitic capacitances generated between electrodes and lines for driving the display and electrodes and lines for touch sensing
Data Source
AI summary
Disclosed are a touch display panel and a touch display device. In a touch display panel and a touch display device, a shielding pattern is arranged between a data link line and a touch link line in a non-active area of the touch display panel, and a signal corresponding to the touch driving signal is applied to the shielding pattern. Parasitic capacitance between the data link line and the touch link line is prevented in order to reduce noise on the touch sensing signal caused by voltage fluctuation on the data link line. Accordingly, it is possible to reduce the influence of display driving on touch sensing, thereby improving touch sensing during display driving.