Shielding Signal Line Isolates Touch Electrodes in Narrow Bezel Displays
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Solution Overview
Problem
Touch display panels with narrow bezels and high screen-to-body ratios experience signal interference between touch driving and sensing electrodes, leading to reduced touch precision and sensitivity due to the close proximity of signal lines.
Innovation Solution
Incorporating a notch in the display region for functional modules like cameras, with a shielding signal line placed in the non-display region adjacent to the notch, isolating electrode lines from connection lines to reduce coupling effects and improve touch detection precision and sensitivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the distance between signal lines is reduced to achieve narrow bezel design, then the screen-to-body ratio is improved, but signal interference between lines increases
Solution Approach 1:
The patent introduces a shielding signal line as an intermediary element positioned between the first electrode line and the first connection line. This shielding line acts as a mediator that blocks electromagnetic coupling between the two signal lines, allowing them to be placed closer together without causing interference, thus enabling narrow bezel design while maintaining signal integrity
Solution Approach 2:
The patent applies local shielding by positioning the shielding signal line specifically in the region where electrode lines and connection lines are in close proximity (the non-display region adjacent to the notch). This localized approach provides targeted interference protection only where needed, rather than shielding the entire display structure
2Device complexity
If signal lines are placed in close proximity to reduce device size, then manufacturing complexity is reduced, but touch detection precision deteriorates
Solution Approach 1:
The shielding signal line serves as a protective intermediary that allows simple, close-proximity routing of signal lines while preventing the coupling effects that would otherwise degrade touch detection precision. The shielding line absorbs or redirects electromagnetic interference, preserving signal integrity despite the simplified layout
3Device complexity
If signal lines are placed in close proximity to reduce device size, then manufacturing complexity is reduced, but touch sensitivity deteriorates
Solution Approach 1:
The shielding signal line acts as a protective barrier that enables close-proximity signal line placement without compromising touch sensitivity. By blocking electromagnetic coupling between the electrode line and connection line, the shielding line ensures that touch signals remain clear and sensitive even when lines are routed close together in the non-display region
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 signal line effectively isolates signal lines, reducing mutual interference and enhancing touch sensitivity and precision, while also protecting the shielding line from line breaking risks and maintaining a narrow bezel design.
Implementation Method 1
A shielding signal line is disposed in the touch display panel; and an orthographic projection of at least part of the shielding signal line located in the first non-display region onto a substrate of the touch display panel are located between an orthographic projection of the first electrode line onto the substrate, and an orthographic projection of the first connection line onto the substrate. In this way, in the first non-display region, the shielding signal line is used to isolate the first electrode line from the first connection line to reduce the coupling effect between the first electrode line and the first connection line
Data Source
AI summary
Provided are a touch display panel and a display device. The touch display panel includes a first touch electrode, a second touch electrode, a shielding signal line, and a driving chip. The first touch electrode and the driving chip are electrically connected by a first electrode line. The first electrode line includes at least one part located in a first non-display region of the touch display panel. The second touch electrode includes a first touch sub-electrode and a second touch sub-electrode, which are connected by a first connection line. The first connection line includes at least one part located in the first non-display region. The shielding signal line includes at least one part located in the first non-display region. In the first non-display region, the first electrode line and the first connection line are isolated by the shielding signal line.