Self-Capacitance Touch Display Panel Narrow Frame Design
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Solution Overview
Problem
Existing touch display panels face challenges in achieving a narrow frame design while maintaining effective touch control performance, particularly due to the need for increased edge frame area for wiring connections in self-capacitance type touch panels.
Innovation Solution
The implementation of a self-capacitance type touch display panel with a separate first metal layer for touch lead wires, allowing these wires to be arranged above existing peripheral circuits, and the reuse of common electrodes as self-capacitance touch electrodes, positioned between gate and data lines to minimize parasitic capacitance and reduce frame area requirements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If wiring connections are routed in the edge frame region to connect electrodes to the touch control chip, then the touch control function is achieved, but the area of the edge frame region increases and narrow frame design is not facilitated
Solution Approach 1:
The patent introduces a first metal layer positioned between the gate electrode metal layer and the source/drain electrode layer, creating a new spatial dimension for routing touch lead wires. This allows the wiring to be conducted through the pixel region rather than being confined to the edge frame region, thereby reducing the edge frame area while maintaining touch control functionality.
Solution Approach 2:
The first metal layer serves multiple functions: it acts as a routing path for touch lead wires, provides electrical connection between touch electrodes and the touch control chip, and integrates with the existing pixel electrode structure. This multi-functionality eliminates the need for separate edge frame wiring regions.
2Area of stationary object
If common electrodes are reused as self-capacitance touch electrodes, then the frame area is reduced and narrow frame design is enabled, but parasitic capacitance between the electrode and other signal lines may affect touch control performance
Solution Approach 1:
The patent positions the self-capacitance touch electrode (formed by the common electrode) in a specific location between adjacent gate lines and data lines, where the local electromagnetic environment is optimized. This positioning minimizes the electrode's proximity to other signal lines that would generate parasitic capacitance, while still achieving the narrow frame design benefit.
Solution Approach 2:
The patent accepts that some parasitic capacitance exists but optimizes its impact by strategically positioning the touch electrode. The electrode is placed in a region where the parasitic capacitance is minimized, and the design leverages the existing pixel electrode structure to achieve both narrow frame and acceptable touch performance.
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 solution enables a narrow frame design while improving touch control performance by reducing parasitic capacitance and allowing for efficient touch signal transmission without increasing the frame area, thus enhancing the touch experience on large-sized display panels.
Implementation Method 1
the capacitance carried over the electrode m is a fixed value when a finger does not touch the electrode; when the finger touches the electrode, the capacitance carried over the electrode m is a finger capacitance plus the initial capacitance
Implementation Method 2
parasitic capacitance between the self-capacitance touch electrode and other signal lines is very small during the touch stage
Implementation Method 3
a driving signal is applied to the electrode from the touch control chip p, and the electrode m itself may receive a feedback signal
Implementation Method 4
the first metal layer comprises a plurality of touch lead wires corresponding to the respective self-capacitance touch electrodes one to one, and each of the self-capacitance touch electrodes is connected with the touch control chip via a corresponding touch lead wire
Data Source
AI summary
The present disclosure provides a touch display panel including a self-capacitance or mutual-capacitance type touch display panel, a manufacturing method and a method driving for the same and a display device. The self-capacitance type touch display panel includes an array substrate having a first metal layer and self-capacitance touch electrodes, and a touch control chip. Each touch electrode includes common electrodes, first metal layer includes touch lead wires corresponding to the touch electrodes, and each touch electrode is connected with the touch control chip via a corresponding touch lead wire. The touch lead wire is configured to transmit a common electrode signal to the touch electrode during a display stage, to transmit a touch scan signal to the touch electrode during a touch stage, and to transmit a touch signal, which is generated by the touch electrode at a position where a touch operation occurs, to the touch control chip.