Capacitance Touch Structure Integrated with Electro-Wetting Display Substrate
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Solution Overview
Problem
Conventional electro-wetting display (EWD) devices lack touch control functionality, which is essential for enhanced user interaction in modern electronic devices.
Innovation Solution
A touch substrate with a transparent substrate, thin film transistor elements, and a capacitance touch structure comprising parallel conductive electrodes on both surfaces, forming sensing capacitors to enable touch control functionality while maintaining the electro-wetting display's bright and dark conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional EWD device structure is used, then the display maintains simple structure and low cost, but the device lacks touch control functionality
Solution Approach 1:
The patent combines the display function and touch control function into a single integrated device. The capacitance touch structure is integrated with the EWD device structure, where the first and second conductive electrodes are incorporated into the existing substrate and liquid crystal layer structure, allowing both display and touch control operations to be performed simultaneously without requiring separate independent systems
Solution Approach 2:
The conductive electrodes serve dual purposes: they function as part of the EWD display mechanism while simultaneously forming sensing capacitors for touch control detection. This multi-functionality allows the same structural elements to support both display operations and touch sensing, enhancing device versatility without proportionally increasing complexity
2Ease of operation
If capacitance touch structure with multiple conductive electrodes is added, then touch control functionality is achieved, but the device structure becomes more complex
Solution Approach 1:
The touch sensing area is divided into multiple sensing capacitors formed by intersecting first and second conductive electrodes. This segmentation allows for precise detection of touch coordinates by identifying which specific sensing capacitor experiences capacitance change, enabling accurate touch position detection while using a relatively simple electrode arrangement
Solution Approach 2:
The patent uses two sets of conductive electrodes arranged in different directions (first electrodes and second electrodes that cross the first electrodes) to form a grid-like structure. By detecting capacitance changes along both dimensions, the system can precisely locate touch coordinates through coordinate identification, achieving accurate touch detection without requiring a separate electrode for each sensing point
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
The integration of a touch control system allows for precise detection of touch coordinates, enhancing user interaction without compromising the display's performance in displaying bright and dark conditions.
Implementation Method 1
Incident light is absorbed by the first liquid 13, so that the pixel area R of the EWD device 10 displays a dark condition
Implementation Method 2
When a voltage greater than the threshold voltage is applied, the surface tension of the second liquid 12 is changed. The second liquid 12 pushes the first liquid 13 towards one of the pixel wall 16
Implementation Method 3
The first electrodes, the second electrodes and the transparent substrate sandwiched therebetween form a plurality of sensing capacitors
Data Source
AI summary
A touch substrate includes a transparent substrate having a first surface and a second surface facing the first surface, a plurality of thin film transistor elements disposed on the second surface, and a capacitance touch structure. The capacitance touch structure includes a plurality of parallel first conductive electrodes disposed on the first surface and a plurality of parallel second conductive electrodes disposed on the second surface. The second electrodes cross the first electrodes insulatingly. The first electrodes, the second electrodes and the transparent substrate sandwiched therebetween form a plurality of sensing capacitors.