Touch Display Panel Trace Layout for Uniform Signal Transmission
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Solution Overview
Problem
Existing touch display panels face issues with non-uniform signal transmission and reduced accuracy due to varying resistances and capacitances in touch lines extending to the touch integrated circuit, affecting the uniformity and accuracy of touch sensitivity.
Innovation Solution
The touch display panel design includes touch lines with varying cross-sectional areas and lengths, with specific ratios and through holes in the conductive layer to balance resistance and parasitic capacitance, ensuring consistent signal transmission and improved touch accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch lines are extended to connect touch units to the touch integrated circuit, then electrical connection is achieved, but resistance and parasitic capacitance vary causing non-uniform signal transmission
Solution Approach 1:
The patent applies local quality by making different parts of the touch line have different properties. Specifically, the touch line includes a first section with a first cross-sectional area and a second section with a second cross-sectional area, where the cross-sectional areas are different. This allows the touch line to have varying electrical characteristics along its length, enabling compensation for resistance and capacitance variations to achieve uniform signal transmission.
Solution Approach 2:
The patent changes the geometric parameter of the touch line by varying its cross-sectional area along different sections. The first cross-sectional area and second cross-sectional area are specifically designed with different values to adjust the electrical parameters (resistance and capacitance) of the touch line, thereby compensating for variations and improving signal transmission uniformity.
2Reliability
If through holes are introduced in the conductive layer to reduce parasitic capacitance, then signal transmission is improved, but manufacturing precision requirements increase
Solution Approach 1:
The patent introduces an intermediary structure - the through holes in the conductive layer - to mediate between the touch line and the underlying conductive structure. These through holes are specifically positioned and sized to reduce parasitic capacitance between the touch line and the conductive layer, thereby improving touch accuracy while managing the manufacturing precision requirements through controlled design.
3Reliability
If touch lines have varying lengths and cross-sectional areas, then resistance and capacitance can be balanced, but device complexity increases
Solution Approach 1:
The patent segments the touch line into multiple sections with different cross-sectional areas. The touch line includes a first section extending from the touch unit and a second section extending from the first section, where each section has a different cross-sectional area. This segmentation allows independent optimization of electrical characteristics for different parts of the touch line, enabling better resistance and capacitance balancing.
Data Source
AI summary
The present disclosure provides a touch display panel. The touch display panel includes a display substrate and a touch layer, wherein the touch layer includes a plurality of touch units and a plurality of touch lines which are disposed on the display substrate; wherein the touch lines are connected to at least one touch unit and are configured to electrically connect the touch unit connected thereto to a touch integrated circuit; the plurality of touch lines at least include a first trace and a second trace which are disposed in a non-display region; and the display substrate includes a conductive layer disposed in the non-display region; wherein at least one first through hole and at least one second through hole are defined in the conductive layer.