Touch Screen Display Device With Coupled Sensing Electrodes
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Solution Overview
Problem
Existing touch screen technologies face challenges in accurately detecting touch positions due to limitations in sensing transistor configurations and electrode arrangements, which affect the precision and reliability of touch input recognition.
Innovation Solution
The touch screen display device incorporates a sensing transistor with a first and second touch electrode, coupled through a coupling portion, and an initialization voltage line, along with a touch driving unit and position detecting unit, to enhance touch sensing accuracy by initializing and detecting touch signals effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional sensing transistor configuration is used, then the device structure is simple, but the touch position detection accuracy is insufficient
Solution Approach 1:
The sensing transistor is divided into multiple functional regions with distinct electrodes: a first touch electrode positioned between the gate and semiconductor layer, a second touch electrode spaced from the first, and a coupling portion connecting them. This segmentation allows each region to contribute differently to touch sensing, improving detection accuracy while maintaining a systematic structure.
Solution Approach 2:
The touch sensing mechanism extends into the vertical dimension by positioning the first touch electrode between the gate electrode and semiconductor layer, rather than only in the planar direction. This three-dimensional electrode arrangement enables more precise touch position detection by capturing capacitance changes from multiple spatial perspectives.
2Measurement precision
If multiple touch electrodes are introduced to improve sensing accuracy, then the touch detection precision improves, but the manufacturing process becomes more complex
Solution Approach 1:
The first and second touch electrodes are integrated within the same sensing transistor structure, sharing common elements such as the semiconductor layer and gate electrode. This merging approach allows multiple sensing functions to be achieved within a unified manufacturing process, reducing overall fabrication complexity while maintaining high touch detection precision.
Solution Approach 2:
The sensing transistor structure serves multiple functions: the first touch electrode detects touch events, the second touch electrode provides additional sensing capability, and the coupling portion enables signal transmission. This multi-functional design allows a single structure to perform several sensing operations, simplifying the overall manufacturing process while improving touch sensing accuracy.
3Measurement precision
If the first touch electrode is positioned between the gate electrode and semiconductor layer, then the touch sensing accuracy is improved, but the transistor structure becomes more complex
Solution Approach 1:
The first touch electrode is nested within the existing transistor structure, specifically positioned between the gate electrode and semiconductor layer. This nesting approach allows the touch sensing function to be integrated into the conventional transistor architecture without requiring completely separate sensing structures, thereby improving touch signal detection accuracy while limiting the increase in overall device complexity.
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 configuration improves the accuracy of touch position detection by ensuring precise coupling of electrodes and efficient signal processing, leading to enhanced user input recognition and device responsiveness.
Implementation Method 1
a coupling portion to couple the first and second touch electrodes
Data Source
AI summary
A touch screen display device includes a plurality of pixels and a plurality of touch sensing units. Each touch sensing unit includes a sensing transistor, a first touch electrode between a gate electrode and a semiconductor layer of the sensing transistor, a second touch electrode spaced from the first touch electrode, and a coupling portion to couple the first and second touch electrodes.