Touch Display Panel Margin Sensing Series Design
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Solution Overview
Problem
Conventional capacitive touch panels require a wider border to maintain consistent sensibility, limiting the enlargement of the active screen area due to the placement of sensing electrodes and margin electrodes, which restricts the reduction of the margin width.
Innovation Solution
The design incorporates a touch sensing substrate with center and margin sensing series, where the margin sensing series forms a parallel hemline along the display area's margin, allowing all sensing series to be disposed within the display area, thereby eliminating the need for a dummy margin area and achieving a slim border.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If diamond sensing electrodes are used to accomplish consistent sensibility, then touch sensing uniformity is improved, but margin width increases due to electrodes extending outside active area
Solution Approach 1:
The sensing electrode is divided into two functional segments: a first sensing electrode within the active area for touch detection, and a second sensing electrode extending into the margin area for compensation. This segmentation allows each part to serve its specific purpose while collectively solving the sensibility consistency problem without excessively increasing margin width.
Solution Approach 2:
The second sensing electrode in the margin area serves multiple functions: it compensates for the capacitive effect at the boundary, maintains sensing uniformity across the active area, and enables the use of diamond-shaped electrodes without requiring excessive margin width. This multi-functionality resolves the contradiction between sensibility consistency and margin width control.
2Illumination intensity
If margin electrodes are added to provide even light transmittance, then optical uniformity is improved, but active area cannot be enlarged due to small electrode areas
Solution Approach 1:
The compensation function and light transmittance optimization are merged into a single integrated electrode structure. The second sensing electrode in the margin area simultaneously provides capacitive compensation and maintains optical uniformity, eliminating the need for separate margin electrodes and enabling active area enlargement.
Solution Approach 2:
The second sensing electrode performs multiple functions concurrently: capacitive compensation, light transmittance optimization, and boundary effect mitigation. This multi-functionality allows the active area to be enlarged without compromising optical uniformity or sensing performance.
3Reliability
If wider border is used to accommodate sensing electrodes, then touch sensing coverage is improved, but device volume increases
Solution Approach 1:
Different regions of the electrode structure are assigned different qualities and functions: the first sensing electrode in the active area focuses on touch detection, while the second sensing electrode in the margin area focuses on compensation and coverage extension. This local differentiation enables improved sensing coverage without proportionally increasing device volume.
Solution Approach 2:
The sensing coverage is extended not only within the active area but also into the margin area through the second sensing electrode. This dimensional extension into the border region improves touch sensing coverage while minimizing the impact on overall device volume by utilizing the existing margin space efficiently.
Data Source
AI summary
A touch display panel including a flat display panel and a touch sensing device disposed on the flat display panel is provided. The touch sensing device includes a plurality of the center sensing series and at least a margin sensing series corresponding to the display area of the flat display panel. Each center sensing series is formed by a plurality of center sensing electrodes serially connected. The margin sensing series disposed along the margin of the display area is formed by a plurality of margin sensing electrodes serially connected. Each of the margin sensing electrodes includes an inner portion and a rectangular outer portion. An area of the inner portion is substantially half of an area of the center sensing electrode. A parallel hemline is formed by the rectangular outer portions serially connected.