Touch Display Device Integrating Electrodes for Sensing
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Solution Overview
Problem
Current touch display devices face challenges in integrating touch sensing functionality with display functionality while minimizing manufacturing processes and components, leading to increased costs and potential interference with lighting effects during touch sensing.
Innovation Solution
The integration of a thin-film transistor (TFT) substrate with a light-emitting element and a touch sensing electrode, where the light-emitting element's electrodes function as touch sensing electrodes, allowing for self-capacitance change detection, and optionally incorporating a reference electrode for three-dimensional touch sensing, reducing manufacturing steps and components.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate touch sensing electrodes and display electrodes are used, then touch sensing accuracy is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the display electrode and touch sensing electrode into a single integrated electrode structure. The same electrode that serves as the display electrode also functions as the touch sensing electrode, eliminating the need for separate touch electrodes. This merging reduces device complexity and manufacturing cost while maintaining adequate touch sensing functionality through self-capacitance detection methods.
Solution Approach 2:
The electrode is designed to perform multiple functions simultaneously: it serves as both the display electrode for showing visual content and the touch sensing electrode for detecting user input. This multi-functionality approach allows a single component to fulfill both display and touch interaction roles, simplifying the overall device architecture.
2Adaptability or versatility
If additional touch sensing layers are added, then touch sensing functionality is improved, but manufacturing processes and cost increase
Solution Approach 1:
The patent merges the touch sensing function into the existing display electrode structure, eliminating the need for additional separate touch sensing layers. By using the display electrode itself for touch sensing through self-capacitance detection, the invention avoids adding manufacturing complexity while maintaining versatile touch sensing capabilities including multi-touch and gesture recognition.
3Adaptability or versatility
If separate touch and display components are integrated, then functionality is improved, but interference with lighting effects occurs
Solution Approach 1:
The electrode performs dual functions as both display and touch sensing component, but the touch sensing operation uses self-capacitance detection that does not emit light or interfere with the display lighting effects. The sensing mechanism relies on detecting changes in capacitance caused by touch, which is transparent to the optical performance of the display.
Solution Approach 2:
The patent replaces potential mechanical or optical touch sensing mechanisms that might interfere with display lighting with an electrical field-based self-capacitance detection method. This substitution uses electrical field interactions rather than mechanical or optical interference, allowing touch sensing to occur without affecting the visual display quality.
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 enables efficient touch motion sensing in two or three dimensions with reduced manufacturing complexity and cost, while minimizing interference with the display lighting effect, by utilizing the light-emitting element's electrodes for touch sensing and potentially adding a reference electrode for Z-axis sensing.
Implementation Method 1
The integration of a thin-film transistor (TFT) substrate with a light-emitting element and a touch sensing electrode, where the light-emitting element's electrodes function as touch sensing electrodes, allowing for self-capacitance change detection
Data Source
AI summary
A touch display device includes a thin-film transistor (TFT) substrate and a light-emitting element. The TFT substrate has a substrate and a TFT structure. The TFT structure is disposed on the substrate and includes a driving transistor. The light-emitting element is disposed on the TFT structure and has a first end electrode, a light-emitting layer and a second end electrode. The first end electrode is electrically connected with the driving transistor. The light-emitting layer is disposed between the first end electrode and the second end electrode. The first end electrode or the second end electrode is a touch sensing electrode of the touch display device.