Touch Display Panel Electrode Layout for Lower Capacitive Load
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Solution Overview
Problem
The capacitive load on touch controllers in touch display panels increases due to overlapping areas between touch sensing electrodes and connected cables, leading to increased drive load.
Innovation Solution
A touch display panel design with a first and second metal layer, where the second metal layer's conductive patterns are arranged in a matrix form with non-overlapping areas, reducing capacitive load by minimizing overlapping between conductive wires and using floating wires to prevent capacitive formation at intersections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the touch sensing electrode area is increased to improve touch sensitivity, then the capacitance value increases, but the capacitive load on the touch cable and drive load on the touch controller increase
Solution Approach 1:
The conductive pattern is divided into multiple segments (first conductive pattern, second conductive pattern, third conductive pattern) arranged in a matrix. Each segment is independently connected to the touch cable through separate connection points, distributing the capacitive load across multiple connection points rather than having one large electrode connected to a single cable, thereby reducing the capacitive load on each individual cable while maintaining overall touch sensitivity
Solution Approach 2:
The conductive patterns are arranged in a three-dimensional matrix structure across multiple layers (first, second, and third conductive patterns at different positions). This spatial distribution in multiple dimensions allows the touch sensing function to be maintained across a large area while reducing the overlapping area between any single conductive pattern and the touch cable, thereby reducing capacitive load
2Reliability
If the overlapping area between touch cable and sensing electrode is increased to improve signal transmission, then the connection reliability improves, but the capacitive load on the touch controller increases
Solution Approach 1:
Multiple connection points are established between the conductive patterns and touch cables. Instead of relying on a single large overlapping area for connection, the system uses multiple smaller connection points distributed across the matrix structure. This segmentation maintains connection reliability through redundancy while reducing the capacitive load at each individual connection point
Solution Approach 2:
The conductive patterns are designed with varying local characteristics - each segment has optimized dimensions and positioning to achieve appropriate local overlap with touch cables. This ensures sufficient connection reliability at each local connection point while preventing excessive capacitive load accumulation, as each local area contributes only a portion of the total capacitance
3Measurement precision
If the conductive patterns are arranged in a dense matrix form to improve touch detection precision, then the touch location accuracy improves, but the overlapping area with light-emitting areas increases, affecting image brightness
Solution Approach 1:
The dense matrix of conductive patterns is segmented into distinct first, second, and third conductive patterns positioned at different locations. This segmentation allows the system to achieve high touch detection precision through the matrix arrangement while ensuring that individual patterns do not excessively overlap with light-emitting areas, as each segmented pattern can be independently positioned to minimize light obstruction
Solution Approach 2:
The conductive patterns are distributed across multiple spatial dimensions and layers, creating a three-dimensional matrix structure. This dimensional distribution enables high touch detection accuracy through dense spatial sampling while reducing the two-dimensional projection overlap with light-emitting areas, as the patterns extend in multiple directions and layers rather than concentrating in a single plane
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 design effectively reduces capacitive load on the touch controller, enhances touch operation identification accuracy, and maintains image brightness by ensuring conductive wires do not obstruct light-emitting areas.
Implementation Method 1
the plurality of conductive patterns each output a first sensing signal through self-capacitance when sensing a touch operation
Data Source
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Figure 3
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AI summary
This application provides a touch display panel and a touch display apparatus for reducing capacitive load. A surface of a package substrate in the touch display panel includes a first metal layer and a second metal layer that are mutually insulated. The second metal layer includes a plurality of conductive patterns that are arranged in a matrix form in a first direction and a second direction. The plurality of conductive patterns each output a first sensing signal through self-capacitance when sensing a touch operation. Each conductive pattern includes a first area and a second area that do not overlap. The first area includes a plurality of first metal sub-conducting wires extending in the first direction. A plurality of second metal conducting wires extending in the second direction are disposed in the first area corresponding to the first metal layer, the second metal conducting wire does not overlap the first metal sub-conducting wire in the second direction, any second metal conducting wire is electrically connected to one conductive pattern and is configured to transmit the first sensing signal to a touch controller, and the touch controller is configured to identify a location of the touch operation based on the first sensing signal.