Pseudo Touch Electrodes for 5G Interference Mitigation
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Solution Overview
Problem
Touch display devices experience performance deterioration due to electromagnetic interference between radio signals and touch driving signals, particularly in high-frequency bands like 5G mmWave, which affects both radio signal transmission and touch sensing capabilities.
Innovation Solution
The implementation of pseudo touch electrode lines arranged in a non-display area of the touch display device, with these lines spaced apart by a reference interval shorter than the wavelength of the radio signal, and supplied with a pseudo touch driving signal having a phase opposite to the touch driving signal, helps counterbalance electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If touch electrode lines are disposed in the display panel for touch sensing, then touch detection capability is improved, but electromagnetic interference with radio signals deteriorates performance
Solution Approach 1:
Pseudo touch electrode lines are introduced as intermediary elements disposed in the non-display area. These pseudo electrodes act as mediators that generate counter-phase electromagnetic fields to cancel out the interference between touch driving signals and radio signals, thereby protecting radio communication performance while maintaining touch sensing capability
Solution Approach 2:
The patent converts the harmful electromagnetic interference generated by touch electrode lines into a beneficial effect by using pseudo touch electrode lines to generate counter-phase signals. The interference that was originally detrimental to radio signals is transformed into a cancellation mechanism that actively reduces electromagnetic noise in the radio frequency band
2Reliability
If pseudo touch electrode lines are added to reduce electromagnetic interference, then radio signal transmission is improved, but device structure becomes more complex
Solution Approach 1:
The patent resolves structural complexity by relocating pseudo touch electrode lines from the display area to the non-display area (bezel region). This dimensional relocation allows the additional electrodes to be disposed in an unused spatial dimension without interfering with the display structure or increasing complexity in the active display region
3Object-affected harmful factors
If pseudo touch electrode lines are spaced closely to reduce interference, then electromagnetic interference is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The patent optimizes the spacing parameter of pseudo touch electrode lines by setting the reference interval to be shorter than the wavelength of the radio signal. This parameter change ensures effective electromagnetic interference reduction while maintaining manufacturability, as the spacing requirement is defined relative to the radio signal wavelength rather than being an arbitrary fixed dimension
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 arrangement effectively reduces electromagnetic interference, enhancing both radio signal transmission and touch sensing performance by minimizing noise and securing additional space for pseudo touch electrode lines, thereby improving overall device performance.
Implementation Method 1
electromagnetic interference between the radio signal and the touch driving signal
Data Source
AI summary
The present disclosure relates to a touch display device including a display panel in which a plurality of touch electrode lines including a plurality of X-touch electrode lines extending to a first direction and a plurality of Y-touch electrode lines extending to a second direction, and a plurality of subpixels are disposed; a touch driving circuit for supplying a touch driving signal to the display panel and sensing a touch by detecting a touch sensing signal; at least one or more pseudo touch routing lines disposed along a non-display area of the display panel; and a plurality of pseudo touch electrode lines extending from the at least one or more pseudo touch routing lines and spaced apart from each other at a reference interval.