Touch Display Noise Shielding Layer
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Solution Overview
Problem
In touch sensing enabled display devices, the interference between touch sensing and display driving elements reduces touch sensing performance.
Innovation Solution
A touch display device is designed with a noise shielding layer placed between the data/signal lines and light emitting elements to reduce interference, improving touch sensing performance by blocking coupling between these elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If touch electrodes and light emitting elements are disposed in close proximity to enable touch sensing functionality, then device functionality is improved, but interference between touch sensing and display driving elements increases
Solution Approach 1:
A noise shielding layer is introduced as an intermediary component between the light emitting elements and the touch electrodes. This shielding layer acts as a mediator that blocks electromagnetic interference from the light emitting elements from affecting the touch electrodes, thereby enabling both functions to coexist without mutual interference.
Solution Approach 2:
The display device is segmented into distinct functional layers with the noise shielding layer separating the light emitting element layer from the touch electrode layer. This segmentation allows each layer to perform its specific function independently while preventing harmful interactions between adjacent functional elements.
2Device complexity
If elements for display driving and touch sensing are integrated in the same display panel, then device integration is improved, but touch sensing performance deteriorates due to interference
Solution Approach 1:
The noise shielding layer serves as a mediator that allows integration of display driving and touch sensing functions while preventing interference. It enables both functions to share the same display panel structure without compromising touch sensing performance through electromagnetic coupling.
Solution Approach 2:
The noise shielding layer is strategically positioned only in specific regions where interference occurs between light emitting elements and touch electrodes, providing localized protection where needed while maintaining overall device integration and functionality.
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 noise shielding layer effectively reduces voltage fluctuations in the light emitting elements, enhancing touch sensing accuracy and performance by minimizing noise in the touch sensing signals.
Implementation Method 1
a noise shielding layer located between a layer in which the plurality of data lines are disposed and a layer in which the plurality of light emitting elements are disposed
Data Source
AI summary
The present disclosure provides a touch display device having a structure in which at least one touch electrode is disposed on an encapsulation layer, and including a noise shielding layer located between a layer in which the signal line under the encapsulation layer is disposed and a layer in which at least one light emitting element is disposed. The noise shielding layer can block coupling between the signal line and an electrode of the light emitting element, and reduce or prevent a fluctuation in the voltage of the electrode of the light emitting element from causing noise to occur in a touch sensing signal detected by the at least one touch electrode on the encapsulation layer.