Touch Screen Display Electrode Integration for Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional touch screen display devices face limitations in improving touch sensitivity, particularly in increasing the area of electrodes for electrostatic capacitance in electrostatic capacitor type touch screen display devices.
Innovation Solution
A touch screen display device with a common electrode, base substrate, display signal lines, pixel electrodes, and a touch position sensing part that includes micro capsules with positively and negatively charged pigment particles, forming electrostatic capacitance between the common electrode and the touch position sensing part, and using a position data processing part to detect changes in capacitance for accurate touch position detection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the area of electrodes is increased to improve touch sensitivity, then the sensitivity of sensing improves, but the device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent combines the touch sensing function with the display pixel structure by integrating sensing electrodes into the existing pixel electrode pattern. The pixel electrodes serve dual purposes: displaying images and sensing touch positions, thereby improving touch sensitivity without adding separate sensing electrode layers that would increase device complexity.
Solution Approach 2:
The pixel electrodes are designed to perform multiple functions simultaneously: they act as both display electrodes for image rendering and sensing electrodes for touch detection. This multi-functionality allows the system to achieve improved touch sensitivity while avoiding the need for additional dedicated sensing components that would complicate the device structure.
2Measurement precision
If conventional electrostatic capacitor methods are used with larger electrodes, then touch sensitivity improves, but the manufacturing process becomes more complicated
Solution Approach 1:
The manufacturing process benefits from merging the sensing electrode formation with the existing pixel electrode fabrication steps. By using the same photolithography and deposition processes already established for creating pixel electrodes, the patent achieves improved touch sensitivity without introducing additional manufacturing complexity or requiring new process equipment.
Solution Approach 2:
The sensing electrodes are formed using the same materials and fabrication methods as the pixel electrodes, ensuring homogeneity in manufacturing processes. This approach maintains ease of manufacture by utilizing established production techniques while achieving the goal of improved touch sensitivity through optimized electrode geometry and integration.
3Measurement precision
If more sensing lines are added to improve touch position detection accuracy, then measurement precision improves, but device complexity increases
Solution Approach 1:
The patent merges the sensing line function with the existing display signal line structure. The same conductive layers used for driving pixel electrodes are also utilized as sensing lines for detecting touch positions. This integration improves touch position detection accuracy while avoiding the addition of separate sensing line structures that would increase device complexity.
Solution Approach 2:
The display signal lines are designed to serve dual purposes: transmitting driving signals to pixel electrodes and acting as sensing lines for touch position detection. This multi-functionality enables improved measurement precision for touch positioning while maintaining simplicity in the overall sensing line structure by reusing existing conductive pathways.
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
Enhances touch sensitivity and allows for improved detection of touch positions with increased accuracy and sensitivity, while also simplifying the manufacturing process and reducing power consumption.
Implementation Method 1
the touch position sensing part sensing a change of electrostatic capacitance formed between the common electrode and the touch position sensing part
Implementation Method 2
The display layer includes a plurality of micro capsules comprising positively charged pigment particles and negatively charged pigment particles
Data Source
AI summary
A touch screen display device includes a common electrode, a base substrate disposed opposite to the common electrode, a display signal line formed on the base substrate, a plurality of pixel electrodes, a touch position sensing part formed between the base substrate and the pixel electrodes, the touch position sensing part sensing a change of electrostatic capacitance formed between the common electrode and the touch position sensing part, and a display layer disposed between the common electrode and the pixel electrodes. The display layer includes a plurality of micro capsules comprising positively charged pigment particles and negatively charged pigment particles.