In-cell Touch Panel Self-Capacitance Electrode Layer Separation
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Solution Overview
Problem
In-cell touch panels with self-capacitance electrodes and leads arranged in the same layer experience touch blind areas, leading to reduced touch performance and non-uniformity in display images due to disordered signals in these areas.
Innovation Solution
The self-capacitance electrodes and leads are arranged in different layers with an interlayer insulating layer in between, using through holes for electrical connection and pseudo through holes at overlapped areas to maintain pattern uniformity and improve display image uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If self-capacitance electrodes and leads are arranged in the same layer, then manufacturing process is simpler, but touch blind areas are produced and display image uniformity deteriorates
Solution Approach 1:
The patent transitions from a two-dimensional same-layer arrangement to a three-dimensional multi-layer arrangement. Self-capacitance electrodes are placed in a first pattern layer while leads are placed in a second pattern layer, utilizing the vertical dimension to separate overlapping elements and eliminate touch blind areas while maintaining manufacturing feasibility through standard multi-layer PCB techniques.
Solution Approach 2:
The patent segments the pattern structure into multiple independent layers. The self-capacitance electrodes form a first pattern on a substrate, and leads form a second pattern on a separate layer, allowing independent optimization of each pattern without interference. This segmentation eliminates the conflict between electrode continuity and lead routing that causes touch blind areas.
2Device complexity
If leads and self-capacitance electrodes are arranged in the same layer, then no additional patterning process is required, but signal disorder occurs in touch blind areas
Solution Approach 1:
The patent resolves signal disorder by separating leads and electrodes into different vertical layers. Leads are routed on a second pattern layer while self-capacitance electrodes remain on a first pattern layer, eliminating signal interference in previously blind areas. The multi-layer structure allows clean signal paths without the complexity of additional patterning processes.
3Ease of manufacture
If self-capacitance electrodes and leads are in the same layer, then manufacturing is easier, but touch performance is reduced due to touch blind areas
Solution Approach 1:
The patent improves touch sensing accuracy by moving leads to a separate second pattern layer, eliminating touch blind areas where leads previously disrupted the electric field. This multi-layer configuration maintains manufacturing simplicity while restoring full touch sensitivity across the entire display surface, including areas previously affected by lead routing.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the uniformity of display images and touch performance by ensuring consistent signal transmission across the panel, reducing touch blind areas and improving the signal-to-noise ratio.
Implementation Method 1
an interlayer insulating layer between the self-capacitance electrodes and the leads
Implementation Method 2
a plurality of through holes penetrating the interlayer insulating layer, the self-capacitance electrodes being electrically connected to the leads through the through holes
Data Source
Figure 1~2a
Figure 2b~3
Figure 4a
AI summary
An in-cell touch panel and a display device are disclosed. The in-cell touch panel comprises: an upper substrate (01) and a lower substrate (2) arranged opposite to each other, a plurality of mutually independent self-capacitance electrodes (03) arranged in the same layer, and a plurality of leads (05) configured to connect the self-capacitance electrodes (03) to a touch detection chip (04). The self-capacitance electrodes (03) and the plurality of leads (05) are arranged in different layers; an interlayer insulating layer (06) is disposed between the self-capacitance electrodes (03) and the leads (05); each self-capacitance electrode (03) is electrically connected with the lead (05) via a through hole running through the interlayer insulating layer (06); and the interlayer insulating layer is provided with recessed portions at overlapped areas of the self-capacitance electrodes and the leads other than the leads electrically connected with the self-capacitance electrodes. Therefore, the uniformity of display images of the touch panel can be improved.