Electrophoresis Driving Electrode Dual-Function Touch Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional display apparatuses with electrophoresis layers require separate electrodes for image display and touch position detection, limiting the functionality and efficiency of the system.
Innovation Solution
A display apparatus design where the driving electrode for image display also functions as an electrode for detecting the input position using an electrostatic capacitance system, allowing for integrated touch detection without the need for additional detection electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If separate electrodes are provided for image display and touch detection, then image display function is achieved, but device complexity increases and manufacturing cost rises
Solution Approach 1:
The driving electrode is designed to serve dual purposes: displaying images through electrophoresis and detecting touch positions through electrostatic capacitance changes. This multi-functionality eliminates the need for separate detection electrodes, reducing device complexity while maintaining both display and touch detection capabilities
Solution Approach 2:
The invention merges the image display function and touch detection function into a single driving electrode structure. By combining these two previously separate functions into one component, the patent reduces the total number of electrodes required in the display apparatus
2Ease of manufacture
If separate electrodes are provided for image display and touch detection, then touch detection accuracy is maintained, but manufacturing precision requirements increase
Solution Approach 1:
The driving electrode performs both display and touch detection functions, eliminating the need to manufacture separate detection electrodes. This reduces manufacturing precision requirements as only one electrode structure needs to be fabricated with high precision rather than multiple electrodes requiring precise alignment
3Productivity
If driving electrode is used for both image display and touch detection, then system efficiency improves, but electrostatic capacitance interference occurs
Solution Approach 1:
The patent employs periodic switching between display mode and touch detection mode. During touch detection, the driving electrode operates in a specific temporal pattern that allows capacitance measurement while minimizing interference with the electrophoresis display function. This periodic operation enables dual functionality while managing electrostatic capacitance interference
Solution Approach 2:
The patent utilizes changes in electrostatic capacitance parameters to detect touch positions. By monitoring capacitance variations caused by finger proximity or contact, the system extracts touch information from the same driving electrode used for display, converting a potentially harmful interference into a useful detection signal
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
Enables efficient and integrated touch detection on the display surface, enhancing user interaction while maintaining image display capabilities without additional hardware, thus improving the overall user experience and system efficiency.
Implementation Method 1
an electric field is formed in the electrophoresis layer by, for example, applying a voltage between a pixel electrode formed on each pixel and a driving electrode commonly formed for a plurality of pixels
Implementation Method 2
an electrophoresis layer containing electrophoretic particles functioning as charging particles
Implementation Method 3
an input position is detected based on an electrostatic capacitance of each of the plurality of second electrodes
Implementation Method 4
when an inputting operation is performed by making the input tool such as a finger, a touch pen or others contact with the capacitive element, a capacitance is added to the capacitive element so as to change the detection capacitance
Data Source
AI summary
In a display apparatus provided with an electrophoresis layer, such a display apparatus capable of operating a driving electrode for use in displaying an image as an electrode for use in detecting an input position is provided. A display apparatus includes: a substrate; another substrate that is disposed so as to face the substrate; an electrophoresis layer sandwiched between the substrate and another substrate; a plurality of pixel electrodes formed on the substrate; and a plurality of driving electrodes formed on another substrate. An electric field is formed between each of the plurality of pixel electrodes and each of the plurality of driving electrodes, so that an image is displayed, and an input position is detected based on an electrostatic capacitance of each of the plurality of driving electrodes.