Touch Driving Wiring Routing for Display Notch Integration
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Solution Overview
Problem
Existing touch sensing units in display devices face challenges in efficiently sensing touch inputs due to the design constraints imposed by components like speakers and optical sensors, which require a notch or trench shape in the display area, leading to reduced screen-to-body ratio and compromised touch sensitivity.
Innovation Solution
A touch sensing unit is designed with a touch driving wiring and a sensing electrode unit, featuring a driving electrode pattern connected to the touch driving wiring and a sensing electrode pattern with rounded corners. The touch driving wiring includes a junction portion with a greater line width than the wiring portion, which bypasses the sensing electrode unit along the rounded corner, optimizing touch signal sensing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a notch or trench shape is introduced in the display area to accommodate components like speakers and optical sensors, then these components can be integrated into the display, but the screen-to-body ratio is reduced and touch sensitivity is compromised
Solution Approach 1:
The patent moves the wiring from the traditional planar layout to a three-dimensional configuration by routing it through the thickness direction of the display device. The wiring passes through the notched portion of the base layer and extends into the side regions, utilizing the Z-dimension (thickness direction) to bypass the sensing area without occupying additional planar space. This dimensional transition allows component integration while preserving screen-to-body ratio and touch sensitivity.
Solution Approach 2:
The wiring is nested within the notched portion of the base layer, utilizing the existing structural space created by the notch. Instead of adding external components that would increase the overall device footprint, the wiring is embedded within the notched region and extends along the side surfaces, effectively using the 'empty space' created by the notch for wiring routing without increasing the screen-to-body ratio.
2Reliability
If wiring is routed through the sensing area, then connection to electrode patterns is achieved, but touch sensing accuracy deteriorates due to interference with the sensing field
Solution Approach 1:
The wiring transitions from a two-dimensional planar route through the sensing area to a three-dimensional path that goes through the thickness direction of the base layer. By passing through the notched portion and extending along the side surfaces, the wiring avoids the sensing area entirely, eliminating electromagnetic interference with the touch sensing field while maintaining reliable electrical connection to the electrode patterns through contact portions at the side surfaces.
Solution Approach 2:
The notched portion of the base layer serves as an intermediary structure that facilitates wiring routing without compromising the sensing area. The wiring uses this notched region as a conduit to bypass the sensing area, and the side surfaces of the base layer act as intermediate contact points for establishing electrical connection, thereby mediating between the need for reliable connection and the requirement to preserve touch sensing accuracy.
3Power
If wiring line width is increased to improve signal transmission, then electrical conductivity improves, but the wiring occupies more space and interferes with the sensing area
Solution Approach 1:
The wiring utilizes the thickness direction of the base layer to increase its effective cross-sectional area for current flow without occupying additional planar space. By routing through the notched portion and extending along the side surfaces, the wiring can have sufficient conductor volume for good electrical conductivity while maintaining a compact planar footprint that does not interfere with the sensing area.
Solution Approach 2:
The wiring structure exhibits varying cross-sectional dimensions at different locations: it has a larger cross-section when passing through the notched portion (providing low resistance), and a smaller cross-section when extending along the side surfaces (minimizing space occupation). This local variation in wiring dimensions optimizes both electrical conductivity and space efficiency at different segments of the wiring path.
Data Source
AI summary
According to an exemplary embodiment of the present invention, a touch sensing unit includes a touch driving wiring and a sensing electrode unit including a driving electrode pattern connected to the touch driving wiring and a sensing electrode pattern with a rounded corner. The touch driving wiring includes a junction portion connected to the driving electrode pattern and a wiring portion extending from the junction portion and bypassing the sensing electrode unit along the rounded corner of the sensing electrode pattern. A line width of the junction portion is greater than a line width of the wiring portion.