In-Cell Touch Array Substrate Data Line Switching
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing in-cell touch display panels require additional touch array circuits, increasing manufacturing complexity and cost due to the separate provision of touch drive and sensing electrodes.
Innovation Solution
An array substrate design that integrates data line layers with first and second touch electrodes, along with switch signal lines, allowing electrical connection of data lines and touch electrodes during touch periods, eliminating the need for a separate touch array circuit by using switch elements to connect all data lines and touch electrodes, thereby simplifying the manufacturing process and reducing costs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate touch array circuits are added to the TFT array substrate, then touch function is achieved, but manufacturing complexity and cost increase
Solution Approach 1:
The patent combines the touch electrode functions with the existing data line layer and common electrode layer of the TFT array substrate. The first touch electrodes are formed using the same data line layer structure, and the second touch electrodes use the common electrode layer, eliminating the need for separate touch array circuits and reducing manufacturing complexity.
Solution Approach 2:
The data line layer serves dual purposes: as data lines for display driving and as first touch electrodes for touch sensing. The common electrode layer similarly serves as both the common electrode for display and as second touch electrodes for touch detection, achieving multi-functionality and reducing overall device complexity.
2Measurement precision
If additional touch array circuits are provided, then touch sensitivity is improved, but manufacturing cost increases
Solution Approach 1:
The patent merges the touch sensing function with existing display structure layers, using the data line layer and common electrode layer as touch electrodes. This integration eliminates the need for additional separate touch array circuits, thereby reducing manufacturing costs while maintaining touch sensitivity through the integrated electrode structure.
3Measurement precision
If data lines are electrically connected during touch period, then touch identification accuracy is improved, but circuit control complexity increases
Solution Approach 1:
The patent implements periodic switching of the first switch elements synchronized with the touch detection period. During the touch detection period, the switch elements are turned on to electrically connect the data lines as touch electrodes, and during the display period, they are turned off. This periodic control enables accurate touch identification while managing circuit control complexity through time-division multiplexing.
Solution Approach 2:
The first switch elements dynamically change the electrical connection state of the data lines based on the operating mode (touch detection or display). This dynamic switching allows the same data line layer to serve different functions at different times, improving touch identification accuracy without requiring permanently complex circuitry.
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 enhances touch sensitivity and identification accuracy while reducing manufacturing complexity and costs by integrating touch functions into the display panel's data line and common electrode layers, eliminating the need for additional touch array circuits and addressing issues of touch insensitivity and visual artifacts.
Implementation Method 1
a control terminal of each first switch element is connected to the first switch signal line, a first terminal of the first switch element is connected one data line in the first touch electrode, and a second terminal of the first switch element is connected another data line in the first touch electrode, so that all of the data lines in the first touch electrode are electrically connected to each other upon the first switch element being turned on
Implementation Method 2
touch drive signals are applied to the touch drive electrodes and voltage signals, over the touch sensing line, coupled out through mutual capacitors are detected
Implementation Method 3
where a human touches the touch screen, an electric field by his/her body acts on the capacitors formed between the touch sensing electrodes and the touch drive electrodes, so that the capacitance of the capacitors is changed
Data Source
AI summary
An array substrate, a touch display device, and a driving method are provided. The array substrate includes a data line layer which includes a plurality of first touch electrodes; a common electrode layer which includes a plurality of second touch electrodes; and a first switch signal line. Each first touch electrode includes a plurality of data lines and a plurality of first switch elements, a control terminal (a) of the first switch element is connected to the first switch signal line, a first terminal (b) of the first switch element is connected one of the data lines in the first touch electrode, and a second terminal (c) of the first switch element is connected another of data lines in the first touch electrode, so that all of the data lines in the first touch electrode are electrically connected to each other upon the first touch electrode being turned on.