Active Touch System With Segmented Sensing Units
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current touch screens, such as resistive, infrared, ultrasonic, and capacitive types, face issues like display quality degradation, high power consumption, calibration needs, water and dust interference, and complex manufacturing processes, which limit their application in portable devices and multi-point touch recognition.
Innovation Solution
An active touch system with sensing electrodes, control electrodes, and detecting lines connected through active devices, allowing each sensing unit to operate independently, using thin film transistors to detect touch positions via leakage currents and improve multi-point touch recognition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a resistive touch screen with double-layer substrate structure is used, then touch sensitivity is improved, but display quality (brightness, contrast, chroma) deteriorates and power consumption increases
Solution Approach 1:
The touch screen is divided into multiple independent sensing units, each with its own active device (transistor). This segmentation allows each unit to operate independently, improving touch sensitivity through precise local detection while using only the necessary electrode layers, thus reducing the impact on display quality and power consumption.
Solution Approach 2:
The invention extracts and removes unnecessary electrode layers and structural components from traditional multi-layer touch screens. By using a simplified structure with active devices directly connected to sensing electrodes, the patent eliminates redundant layers that cause light reflection and reduce display quality, while maintaining high touch sensitivity.
2Illumination intensity
If a planar capacitive touch screen with single-layer substrate is used, then display quality is improved, but positioning drift occurs and calibration is needed
Solution Approach 1:
Each sensing unit is equipped with an active device (transistor) that provides local feedback and signal processing capabilities. This feedback mechanism enables real-time compensation for positioning drift and eliminates the need for calibration, while maintaining the single-layer substrate structure that ensures high display quality.
3Illumination intensity
If a projected capacitive touch screen is used, then display quality is improved, but manufacturing complexity and cost increase due to high resistance requirements
Solution Approach 1:
The invention uses a grid of intersecting control electrodes and detecting lines that copy the sensing function to multiple independent units. This approach reduces the resistance requirements for individual electrodes, allowing the use of standard transparent conductive materials like ITO without requiring additional high-conductivity metal layers, thus simplifying manufacturing while maintaining display quality.
4Adaptability or versatility
If traditional scanning detection mode is used for multi-point touch, then touch recognition capability is improved, but detection time and computing power requirements increase
Solution Approach 1:
The touch screen is divided into multiple independent sensing units, each capable of autonomous detection. This segmentation allows simultaneous detection of multiple touch points without requiring complex scanning sequences, significantly reducing detection time and computing power requirements while maintaining multi-point touch recognition capability.
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 enhances touch screen precision, simplifies post-processing, reduces costs, and enables easy multi-point touch recognition with improved reliability and reduced power consumption.
Implementation Method 1
a coupling capacitance is formed between the finger or other touch object and the sensing electroding unit, and the touch excitation signal on the sensing electroding unit is leaked out partially through the coupling capacitance
Data Source
AI summary
An active touch system is provided, in which sensing electroding units in an array and two groups of intersecting control electrodes and detecting lines are disposed on a touch substrate, and the detecting lines are connected to sensing electrodings through active devices. The control electrodes are used to control on and off of the active devices, and the detecting lines are used to apply touch excitation signals to the sensing electrodings, and detect a leakage current of a sensing electroding to a finger or other touch object. A position of the finger or other touch object on the touch substrate is found by determining a sensing electroding unit generating the leakage current. The method of obtaining touch signals is improved in the hardware sensing stage, so that the judgment procedure after detection is greatly simplified, and the judgment of multi-point touch becomes easy and natural.