Touch Display Panel Shielding Layer Noise Reduction
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Solution Overview
Problem
In Cell touch display panels face noise issues due to the multiplexing of the common electrode layer, which prevents simultaneous display and touch functionality, requiring time-sharing operation.
Innovation Solution
A shielding layer is introduced to shield the spacing region between the touch driving electrode and the data line, reducing noise and enabling simultaneous display and touch functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the common electrode layer is cut in both transverse and longitudinal directions to multiplex it as touch driving electrode, then the aperture ratio and transmittance are maintained, but noise increases and simultaneous display and touch operation becomes impossible
Solution Approach 1:
The common electrode layer is segmented into two distinct parts: a touch driving electrode portion and a common electrode portion, separated by a spacing region. This segmentation allows the electrode to serve dual functions while preventing noise interference between data lines and the common electrode, enabling simultaneous display and touch operation.
Solution Approach 2:
A spacing region is introduced as an intermediary element between the touch driving electrode and the common electrode. This spacing region acts as a mediator to electrically isolate the two portions, preventing noise coupling while maintaining the multiplexing functionality of the common electrode layer.
2Object-generated harmful factors
If the common electrode layer is cut away from data line regions, then noise from data lines is reduced, but the common electrode cannot shield data lines during simultaneous display and touch operation
Solution Approach 1:
The common electrode layer is divided into a touch driving electrode portion that extends over data lines for shielding purposes, and a common electrode portion separated by a spacing region. This segmentation enables the touch driving electrode to shield data lines during simultaneous operation while the spacing region prevents noise coupling.
Solution Approach 2:
Different portions of the common electrode layer are assigned different functions: the touch driving electrode portion provides shielding over data lines where needed, while the common electrode portion maintains the common electrode potential. This local differentiation enables both noise reduction and simultaneous operation.
3Object-generated harmful factors
If time-sharing operation is used for display and touch, then noise is reduced, but the touch and display effects become poor
Solution Approach 1:
The patent enables continuous simultaneous operation of display and touch functions by maintaining proper electrical shielding throughout the display panel. The common electrode layer structure ensures continuous noise protection while both display and touch operations proceed concurrently without interruption or performance degradation.
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 layer effectively reduces noise, allowing for normal simultaneous operation of touch and display functions in touch display panels.
Implementation Method 1
The array substrate further includes a shielding layer, and the shielding layer shields a spacing region between the touch driving electrode and the common electrode corresponding to the position of the data line
Data Source
AI summary
The present invention provides a touch display panel and a display device. The touch display panel includes a substrate, which is provided thereon with a common electrode layer, a thin film transistor, and a data line and a pixel electrode connected with the thin film transistor. The common electrode layer includes a touch driving electrode and a common electrode which are insulated and spaced apart from each other. The array substrate further includes a shielding layer, which shields a spacing region between the touch driving electrode and the common electrode corresponding to position of the data line, thereby greatly reducing noise generated when the source and the data line are being charged, and in turn enabling the touch and the display of the touch display panel to be performed simultaneously.