Self-capacitance touch electrodes with side wings for pin reduction
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Solution Overview
Problem
Existing self-capacitance touch panels face challenges with a large number of wirings and electrode pins at the bonding pad due to numerous self-capacitance touch electrodes, increasing manufacturing costs and complexity.
Innovation Solution
The self-capacitance touch structure incorporates a main body portion and side wing portions with recesses, allowing adjacent electrodes to be arranged in a staggered manner, reducing the number of electrodes and pins while maintaining touch accuracy by increasing the affected area per touch point.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a large number of self-capacitance touch electrodes are used, then the touch accuracy is improved, but the number of wirings and electrode pins at the bonding pad increases
Solution Approach 1:
Each self-capacitance touch electrode is segmented into a main body portion and side wing portions, allowing the electrode to extend into recesses of adjacent electrodes. This segmentation enables increased touch detection coverage without proportionally increasing the number of electrodes or wiring connections.
Solution Approach 2:
The side wing portions of electrodes are nested into the recesses of adjacent electrodes, creating an interlocking pattern. This nesting allows adjacent electrodes to share detection coverage areas, reducing the total number of electrodes needed while maintaining touch accuracy.
2Device complexity
If the number of self-capacitance touch electrodes is reduced, then the number of wirings and bonding pad pins is reduced, but the touch accuracy may be compromised
Solution Approach 1:
The electrode structure extends from a simple linear arrangement into a two-dimensional staggered pattern with side wing portions protruding from the main body. This dimensional expansion allows each electrode to cover a larger effective area and participate in detecting touches at multiple locations, maintaining accuracy with fewer electrodes.
Solution Approach 2:
Different portions of the electrode structure serve different functions: the main body portion provides primary detection capability, while the side wing portions extend into adjacent recesses to enhance detection coverage and enable shared detection zones between neighboring electrodes.
3Device complexity
If traditional square self-capacitance touch electrodes are used, then the structure is simple, but the number of electrodes required is large
Solution Approach 1:
The electrode structure transitions from a symmetric square shape to an asymmetric configuration with a central main body and protruding side wing portions. This asymmetric design allows electrodes to interlock with neighbors in a staggered arrangement, increasing coverage efficiency and reducing the total number of electrodes needed.
Data Source
AI summary
The present disclosure provides a self-capacitance touch structure, a touch panel and a display device. The self-capacitance touch structure comprising a plurality of self-capacitance touch electrodes arranged in an array, the self-capacitance touch electrode comprising a main body portion and a side wing portion protruding from at least one side of the main body portion, wherein at least one recess is formed between the side wing portion and the main body portion, the side wing portion of at least one self-capacitance touch electrode in at least one row extends into the recess of a self-capacitance touch electrode, adjacent to the at least one self-capacitance touch electrode, in another row.