Segmented Array Substrate for Multi-Point Touch Control
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Solution Overview
Problem
Conventional capacitive touch control technologies, particularly self-capacitive designs, are inadequate for multi-point touch recognition, leading to issues like ghost points and limited screen size due to high parasitic capacitance and separate display and touch control operations, which hinder efficient touch control on larger screens.
Innovation Solution
The implementation of an array substrate with a common electrode made of Indium Tin Oxide (ITO) material, segmented into touch control electrodes and connected via lead wires to detect touch signals, allowing for concurrent touch control and display operations without interfering with display performance, and the use of a metal layer to reduce resistance and parasitic capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If self-capacitive touch control technology is used, then integration and thinness are improved, but parasitic capacitance increases causing ghost points and limited screen size
Solution Approach 1:
The patent segments the touch control electrode into multiple independent electrode regions corresponding to different pixel units. Each electrode region is independently connected to the TFT, allowing separate control and reducing mutual interference. This segmentation reduces parasitic capacitance effects while maintaining high integration, enabling accurate multi-point touch detection without ghost points on larger screens.
2Difficulty of detecting and measuring
If separate display and touch control operations are used, then touch control detection is simplified, but operation time increases and efficiency decreases
Solution Approach 1:
The patent merges display and touch control operations into a single integrated process. The touch control electrode is formed within the pixel unit structure during the display manufacturing process, and both display signal writing and touch control detection are performed concurrently through the same electrode structure. This eliminates the need for separate operation sequences, reducing total operation time while maintaining detection accuracy.
3Ease of manufacture
If conventional self-capacitive design is used, then manufacturing is simplified, but multi-point touch recognition fails producing ghost points
Solution Approach 1:
The patent divides the touch control electrode into distinct segmented regions, each corresponding to specific pixel units. This segmentation allows independent capacitance measurement for each region, enabling accurate identification of multiple touch points without ghost point artifacts. The segmented design maintains compatibility with conventional manufacturing processes while achieving precise multi-point touch recognition.
4Area of stationary object
If larger screen size is implemented, then display area increases, but parasitic capacitance increases causing touch control performance degradation
Solution Approach 1:
The patent implements a segmented electrode structure where each segment corresponds to a specific region of the display. This segmentation reduces the total parasitic capacitance by distributing the capacitive load across multiple independent regions rather than having a single large continuous electrode. The segmented design enables accurate touch detection across larger screen areas by reducing mutual interference between adjacent regions.
Solution Approach 2:
The patent applies different electrode configurations to different regions of the display based on local requirements. Each pixel unit or group of pixel units can have optimized electrode dimensions and spacing tailored to local parasitic capacitance characteristics. This local optimization enables consistent touch control performance across the entire large screen area despite variations in local electrical properties.
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
Enables effective self-capacitive multi-point touch recognition without ghost points, improving touch control performance and supporting larger screen sizes by reducing the time required for touch control operations and maintaining display quality.
Implementation Method 1
capacitive touch control technologies... self-capacitive and mutual-capacitive technologies as per capacitance detection schemes
Implementation Method 2
the use of a metal layer to reduce resistance and parasitic capacitance
Data Source
AI summary
The disclosure provides an array substrate and a color filter substrate of a capacitive touch control screen, a touch control display device and a method for driving the touch control display device, so as to achieve the self-capacitive multi-point touch. The array substrate of the capacitive touch control screen includes: a peripheral area and a display area; a plurality of pixel units with pixel electrodes arranged in the display area; a plurality of touch control electrodes; and touch control electrode lead wires connected with a module configured to detect a touch control signal, wherein each of the touch control electrodes is connected respectively with one of the touch control electrode lead wires.