Interlaced Self-Capacitive Electrodes for Touch Substrate Pin Reduction
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Solution Overview
Problem
Current self-capacitive touch display devices face challenges in reducing the number of pins in the bonding pad region of the flexible printed circuit board (FPC) due to the large number of self-capacitive electrodes, leading to small pin width and spacing, which complicates the combination of leads and pins and increases costs.
Innovation Solution
The design of a touch substrate with self-capacitive electrodes arranged in a pattern featuring a body section and projections, where each electrode is interlaced with adjacent electrodes, allowing for increased dimension while maintaining touch accuracy, thereby reducing the number of electrodes and pins required, and improving the yield and cost-effectiveness of the pin combination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of self-capacitive electrodes is increased to improve touch accuracy, then the touch sensing capability is enhanced, but the number of pins in the bonding pad region increases, leading to smaller pin width and spacing
Solution Approach 1:
The patent combines multiple electrode functions into fewer electrodes by using interlaced patterns where projections of one electrode extend into recessed portions of adjacent electrodes. This merging approach maintains touch detection capability while reducing the total number of electrodes and corresponding pins required.
Solution Approach 2:
The patent transitions from a simple grid arrangement to a three-dimensional interlaced structure where electrodes have projections extending in multiple directions. This dimensional change allows electrodes to overlap and interlace, effectively reducing the number of discrete electrode elements needed while maintaining coverage area for touch sensing.
2Ease of manufacture
If the number of pins is reduced to simplify lead-pin combination and reduce costs, then manufacturing complexity is decreased, but touch accuracy may be compromised
Solution Approach 1:
The patent segments each electrode into a body section and multiple projections, where the projections extend into recessed portions of adjacent electrodes. This segmentation allows the electrode pattern to be formed as a single continuous conductive layer, simplifying manufacturing while the interlaced projections maintain adequate sensing coverage for touch accuracy.
Solution Approach 2:
The patent implements a nested structure where projections of one electrode are positioned within the recessed portions of adjacent electrodes, creating an interlaced pattern. This nesting approach allows fewer electrodes to cover the same effective area, reducing pin count while maintaining touch detection capability.
3Ease of manufacture
If traditional grid arrangement of electrodes is used, then manufacturing is simple, but the number of pins required is large, increasing costs and reducing combination yield
Solution Approach 1:
The patent employs asymmetric electrode shapes with body sections and protruding projections rather than symmetric grid patterns. Each electrode has an irregular shape with projections extending in specific directions into adjacent electrode recesses, allowing more efficient space utilization and reduced electrode count while maintaining manufacturing simplicity through single-layer formation.
Data Source
AI summary
A touch substrate, a manufacturing method thereof and a display device. The touch substrate, comprising a plurality of self-capacitive electrodes; a planar shape of each self-capacitive electrode on a surface provided with the plurality of self-capacitive electrodes includes a body section and a plurality of projections extending from a first side of the body section; the plurality of projections extend along a first direction and sequentially arranged along a second direction. On the surface provided with the plurality of self-capacitive electrodes, a recessed portion is encircled by every two projections and the body portion of each self-capacitive electrode; and in the recessed portion is provided with one of a plurality of projections of another self-capacitive electrode. The touch substrate can reduce the number of leads while ensuring the touch accuracy.