Array Substrate Touch Electrodes Shielding and Capacitance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing capacitive in-cell touch panels face increased manufacturing costs and thickness due to additional masking steps and potential interference between touch driving signals and display signals, which affects picture quality and touch accuracy.
Innovation Solution
An array substrate with intersecting data lines, gate lines, and thin film transistors, incorporating first and second touch sensing electrodes that serve as metal shielding and capacitance-forming elements, reducing the number of masking steps and thickness while minimizing signal interference through a simplified structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If touch scanning lines and touch sensing lines are directly added on an existing array substrate, then the capacitive in-cell touch panel can be realized, but the number of masking times in manufacturing process increases and the thickness of the touch panel increases
Solution Approach 1:
The patent merges the touch sensing function with the existing array substrate structure by utilizing the gate lines and data lines as touch sensing lines. The gate electrode and data line are combined to form capacitance nodes for touch sensing, eliminating the need for separate touch scanning lines and sensing lines. This integration reduces the number of masking steps from 6 to 4 and decreases the overall panel thickness.
Solution Approach 2:
The existing array substrate components serve dual functions: the gate lines function as both display control lines and touch sensing lines, while the data lines serve as both data transmission lines and touch sensing lines. This multi-functionality allows the same structural elements to perform both display and touch sensing operations, reducing manufacturing complexity and component count.
2Reliability
If touch scanning lines and touch sensing lines are directly added on an existing array substrate, then the capacitive in-cell touch panel can be realized, but the manufacture cost increases
Solution Approach 1:
The patent merges the touch sensing function with the existing array substrate structure by utilizing the gate lines and data lines as touch sensing lines. The gate electrode and data line are combined to form capacitance nodes for touch sensing, eliminating the need for separate touch scanning lines and sensing lines. This integration reduces the number of masking steps from 6 to 4 and decreases the overall panel thickness.
Solution Approach 2:
The existing array substrate components serve dual functions: the gate lines function as both display control lines and touch sensing lines, while the data lines serve as both data transmission lines and touch sensing lines. This multi-functionality allows the same structural elements to perform both display and touch sensing operations, reducing manufacturing complexity and component count.
3Reliability
If touch driving signals are applied to the added touch scanning lines, then the touch sensing function is enabled, but the touch driving signals may interfere with the original display signals in the array substrate
Solution Approach 1:
The patent employs time-division multiplexing where the array substrate operates in alternating periods: during the first period, touch driving signals are applied to the gate lines and data lines for capacitive touch sensing, and during the second period, display driving signals are applied for normal display operation. This periodic switching prevents signal interference by ensuring that touch and display signals are not active simultaneously on the same lines.
Solution Approach 2:
The patent dynamically switches the function of the gate lines and data lines between touch sensing mode and display driving mode based on the operational period. The system adapts its signal transmission characteristics in real-time, using the same physical lines for different purposes at different times, thereby avoiding static signal conflicts and interference.
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
The solution results in a thinner touch panel with reduced manufacturing complexity and improved signal integrity, enhancing both display quality and touch accuracy by sharing touch sensing electrodes as metal shielding layers and optimizing capacitance formation.
Implementation Method 1
the first touch sensing electrodes and the second touch sensing electrodes intersect with each other in different planes, and capacitances are formed at intersections of the first touch sensing electrodes and the second touch sensing electrodes
Implementation Method 2
the first touch sensing electrodes are provided below active regions of the thin film transistors and also serve as a metal shielding layer for blocking light emitted by a backlight source
Data Source
AI summary
Embodiments of the present invention provide an array substrate and a manufacturing method thereof and a touch display device. The array substrate comprises multiple data lines, multiple gate lines and multiple thin film transistors. The data lines and the gate lines intersect with each other in different planes to divide the array substrate into multiple pixel units, in each of which a thin film transistor is provided, wherein the array substrate further comprises multiple first touch sensing electrodes and multiple second touch sensing electrodes. The first touch sensing electrodes are provided below active regions of the thin film transistors and also serve as metal shielding layers for blocking light emitted by a backlight source. The first touch sensing electrodes and the second touch sensing electrodes intersect with each other in different planes, and capacitances are formed at intersections of the first touch sensing electrodes and the second touch sensing electrodes.