Touch Panel Extended Electrode for Narrow Bezel Writing Reliability
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Solution Overview
Problem
The existing touch panels with narrow bezels face issues with incomplete touch electrode channels at the edges, leading to missing or reduced touch signal data, which compromises the writing reliability of active pens.
Innovation Solution
A touch panel design that includes a touch electrode group within the display area and an extended electrode group in the non-display area, electrically connected to a target function chip, ensuring complete channels and improved signal integrity by overlapping with the touch lead group in the non-display area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the touch electrode is arranged flush with the edge of the display area to accommodate narrow bezel design, then the bezel width is reduced, but the channel on one side of the touch electrode becomes missing or incomplete, resulting in reduced writing reliability of the active pen
Solution Approach 1:
The patent extends the touch electrode from the display area into the non-display area along the width direction, transforming a one-dimensional edge arrangement into a two-dimensional extended structure. This dimensional extension allows the electrode to maintain complete channels while accommodating narrow bezel requirements, as the electrode now occupies space in both the display and non-display areas.
Solution Approach 2:
The touch electrode is divided into two distinct parts: a first electrode group located in the display area and a second electrode group (extended electrode) located in the non-display area. This segmentation allows each part to serve specific functions - the first group maintains display integration while the second group ensures complete signal channels, thereby resolving the contradiction between narrow bezel and writing reliability.
2Reliability
If the touch electrode is extended into the non-display area to complete the channel, then the writing reliability is improved, but the space occupation in the non-display area increases
Solution Approach 1:
The extended electrode group is strategically positioned only in the non-display area, creating a localized functional zone with different electrical properties. This local extension maintains complete signal channels for improved writing reliability while confining the space occupation to a specific region, minimizing impact on overall device layout and other components in the non-display area.
Data Source
AI summary
Provided is a touch panel and a mobile terminal. A touch layer of the touch panel comprises a touch electrode group located in a display area; a touch lead group located at least in a non-display area and electrically connected to the touch electrode group; and an extended electrode group overlapping at least a portion of the touch lead group located in the non-display area. The touch electrode group and the extended electrode group are electrically connected to a target function chip located in the non-display area to achieve a target function.