Touch Display Electrode Layout for 5G EMI Offset
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Solution Overview
Problem
Touch display devices using antennas experience degradation in radio signal and touch sensing performance due to electromagnetic interference between radio signals and touch driving signals, particularly in high-frequency bands like 5G mmWave.
Innovation Solution
The implementation of pseudo-touch electrode lines in a non-display area of the touch display device, which are reverse in phase to the touch driving signal, along with a gate-in-panel type gate driving circuit and power lines, to minimize electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an antenna is added to enable radio communication in the touch display device, then communication functionality is improved, but electromagnetic interference between radio signals and touch driving signals increases, degrading both radio signal transmission/reception performance and touch sensing performance
Solution Approach 1:
The patent applies the principle of converting harm into benefit by using the antenna, which originally causes electromagnetic interference harmful to touch sensing, as a beneficial element for 5G mmWave communication. The patent resolves this contradiction by strategically positioning the antenna in the non-display area and designing pseudo-touch electrode lines that generate electromagnetic fields to offset the interference, thereby transforming the antenna from a harmful component to a beneficial one for communication while maintaining touch sensing performance
Solution Approach 2:
The patent introduces pseudo-touch electrode lines as intermediary elements between the antenna and the touch sensing system. These pseudo-electrode lines generate electromagnetic fields that act as mediators to offset the harmful interference from the antenna, allowing the antenna to function for communication while protecting the touch sensing area from electromagnetic interference
2Illumination intensity
If the antenna is positioned in the non-display area to minimize interference with display content, then display quality is improved, but electromagnetic interference with touch driving signals in the same area increases
Solution Approach 1:
The patent applies local quality by creating different electromagnetic field characteristics in different regions. The pseudo-touch electrode lines are specifically positioned in the non-display area where the antenna is located, generating localized electromagnetic fields that offset interference only in that specific region, thereby protecting the touch driving signals without affecting the display quality in the display area
Solution Approach 2:
The patent implements preliminary anti-action by pre-positioning the pseudo-touch electrode lines in the non-display area before the harmful electromagnetic interference from the antenna can affect the touch driving signals. These pseudo-electrode lines generate opposing electromagnetic fields in advance to counteract and offset the interference before it reaches the touch sensing area
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
Enhances electromagnetic interference offset performance by reducing interference between radio and touch driving signals, thereby improving transmission and reception of radio signals and touch sensing capabilities.
Implementation Method 1
electromagnetic interference between a radio signal and a touch driving signal
Implementation Method 2
A pseudo-touch driving signal reverse in phase to the touch driving signal may be applied to the at least one pseudo-touch electrode line
Data Source
AI summary
The disclosure discloses a touch display device includes, at a display panel including a display area and a non-display area surrounding the display area, a plurality of X-touch electrode lines extending in a first direction and receiving a touch driving signal, a plurality of Y-touch electrode lines extending in a second direction and transmitting a touch sensing signal, a plurality of X-touch lines extending in the second direction and transmitting the touch driving signal, at least one pseudo-touch routing line disposed at an outermost portion of the display panel, and at least one pseudo-touch electrode line extending from the at least one pseudo-touch routing line.