Touch Layer with Embedded Fingers for Resistance and Capacitance Balance
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Solution Overview
Problem
Existing OLED touch display devices face issues with increased electrode resistance and touch load due to small internal metal wiring spaces, and excessive mutual capacitance values affecting touch chip recognition.
Innovation Solution
Optimize the electrode pattern in the touch layer by designing first and second electrodes with varying finger lengths and embedded structures at crossing points, ensuring larger spaces away from the crossing point to increase mutual capacitance while maintaining optimal resistance and capacitance values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If the internal metal wiring space is increased, then the mutual capacitance value increases, but the electrode resistance increases and touch load increases
Solution Approach 1:
The patent applies local quality by varying the finger length of electrodes at different positions. Specifically, electrodes at the four corners have shorter lengths (0.5-1.5 times the standard finger length), while electrodes at the four sides have longer lengths (1.5-2.5 times the standard finger length). This localized differentiation optimizes the balance between mutual capacitance and electrode resistance in different regions of the touch panel.
2Area of stationary object
If the mutual capacitance value is increased, then the touch sensitivity improves, but the touch chip recognition becomes difficult
Solution Approach 1:
The patent implements local quality through differentiated finger lengths for corner and side electrodes. This creates a balanced capacitance distribution that maintains sufficient touch sensitivity while preventing excessive mutual capacitance values that would hinder touch chip recognition. The corner electrodes with shorter fingers reduce capacitance at corners, while side electrodes with longer fingers maintain sensitivity along the edges.
Data Source
AI summary
A touch layer, a touch substrate and a touch display device are provided. The touch layer includes a first electrode chain formed by at least two first electrodes arranged along a first direction and connected with each other, and a second electrode chain formed by at least two second electrodes arranged along a second direction crossing the first direction and connected in sequence; at least one side edge of the first electrode is provided with a plurality of first fingers, at least one side edge of the second electrode is provided with a plurality of second fingers, the first fingers and the second fingers are mutually embedded; at least one first finger has a smaller extension length than other first finger and is closer to the crossing point; at least one second finger has a smaller extension length than other second finger and is closer to the crossing point.