In-cell Touch Panel Wire Reduction for Narrow Frames
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Solution Overview
Problem
In-cell touch panels face challenges with a large number of conductive wires, which hinder narrow frame designs and increase the likelihood of touch blind areas due to the need for numerous peripheral wires and potential interference with display signals.
Innovation Solution
The arrangement of self-capacitance electrodes and conductive wires in the same layer, with the conductive layer occupying a certain area, reduces the number of conductive wires and facilitates a narrow frame design while minimizing touch blind areas by ensuring accurate touch position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each self-capacitance electrode is connected through a separate leading wire, then touch detection accuracy is improved, but the number of conductive wires increases, leading to larger frame width and potential touch blind areas
Solution Approach 1:
The patent merges multiple self-capacitance electrodes into groups, where each group shares a common conductive wire connection. Specifically, multiple self-capacitance electrodes are electrically connected to a single conductive wire through via holes, reducing the total number of leading wires required while maintaining touch detection functionality across the grouped electrodes.
Solution Approach 2:
The patent segments the array of self-capacitance electrodes into multiple groups, where each group is served by a dedicated conductive wire. This segmentation allows systematic reduction of wire count while preserving detection coverage by organizing electrodes into manageable clusters that can be addressed through fewer connection paths.
2Length of stationary object
If the number of conductive wires is reduced, then frame width is narrowed and touch blind areas are reduced, but touch detection coverage may be compromised
Solution Approach 1:
The patent implements a nested structure where multiple self-capacitance electrodes are electrically nested within a single conductive wire connection. The electrodes are arranged in groups, with each electrode connected to the shared conductive wire through via holes, creating a hierarchical connection structure that reduces wire count while maintaining detection area.
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 reduces the number of conductive wires, enabling a narrower frame design and improving touch accuracy by ensuring that touch positions are consistently detected over self-capacitance electrodes, thereby enhancing the overall performance and cost-effectiveness of the touch panel.
Implementation Method 1
the self-capacitance touch screen panel achieves the detection of a finger touch position by means of the self-capacitance principle
Data Source
Figure 1a
Figure 1b
Figure 2a
AI summary
An in-cell touch panel and a display device are provided, and the in-cell touch panel comprises: an upper substrate (01) and a lower substrate (02) arranged oppositely to each other; a conductive layer (20) which is provided on a side, facing the lower substrate (02), of the upper substrate (01) or on a side, facing the upper substrate (01), of the lower substrate (02), and comprises a plurality of hollowed-out regions (21) arranged in a matrix form; a plurality of self-capacitance electrodes (10) insulated from the conductive layer (20) and arranged in a layer in which the conductive layer (20) is provided, each of the hollowed-out regions (21) being provided therein with at least one of the self-capacitance electrodes (10); and a plurality of conductive wires (40) respectively electrically connected with the self-capacitance electrodes (10). This in-cell touch panel can reduce the number of the conductive wires, so as to facilitate a narrow frame design and reduce the occurrence possibility of a larger touch blind area to a certain extent.