In-cell Inductive Touch Detection in Electronic Paper Displays
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Solution Overview
Problem
Existing electronic paper display technologies lack effective touch detection methods that integrate seamlessly with the display panel, resulting in limited precision and functionality for user interaction.
Innovation Solution
Incorporating an inductance coil array between the substrate and pixel electrode array, with driving lines and touch lines connected to each inductance coil, allowing for touch detection by sensing changes in magnetic fields generated by an external stylus, enabling precise touch positioning and integration of electronic paper display technology with in-cell inductance touch capabilities.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional electronic paper display panels are used without integrated touch detection, then the display function is simple and structure is basic, but touch detection precision and functionality are limited
Solution Approach 1:
The patent combines the touch detection function with the display panel structure by integrating inductance coil arrays between the substrate and pixel electrode array. This merging approach allows the panel to perform both display and touch detection functions within a single integrated structure, eliminating the need for separate touch detection layers and achieving high-precision touch detection without proportionally increasing overall device complexity.
Solution Approach 2:
The inductance coil array serves multiple functions: it acts as both a structural component of the display panel and a sensitive touch detection element. The same coil structure that provides mechanical support also detects touch positions through magnetic field changes, enabling the panel to achieve multi-functionality with minimal additional complexity.
2Measurement precision
If inductance coil array is integrated into the display panel, then touch detection precision is improved, but manufacturing complexity increases
Solution Approach 1:
The inductance coil array is divided into multiple independently controllable coil units arranged in specific patterns. Each coil can be individually addressed and controlled through dedicated driving lines, allowing for simplified manufacturing by enabling modular assembly and testing. The segmentation also facilitates precise touch position determination through coordinate calculation based on individual coil responses.
Solution Approach 2:
The patent introduces driving lines as intermediary components that connect the inductance coil array to the control circuitry. These driving lines serve as mediators that simplify the manufacturing process by providing standardized interfaces for signal transmission, making it easier to integrate the coil array into the existing display panel manufacturing workflow without requiring complex direct connections.
3Adaptability or versatility
If in-cell inductance touch technology is integrated with electronic paper display, then user interaction capability is enhanced, but device structure becomes more complex
Solution Approach 1:
The inductance coil array is designed to be self-powered through the existing display panel voltage supply system. The coils utilize the voltage difference between the substrate and common electrode to generate magnetic fields for touch detection, eliminating the need for separate power supply circuits. This self-service approach enables enhanced user interaction functionality while avoiding additional power management complexity.
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (strength, distribution) caused by touch events to detect user input. By monitoring parameter changes in the magnetic field rather than requiring complex mechanical or capacitive structures, the system achieves versatile user interaction capabilities including multi-point touch and pressure sensitivity while maintaining relatively simple device structure.
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 high-precision touch detection and integration of electronic paper display technology with in-cell inductance touch, allowing for accurate stylus-based input and improved user interaction, such as handwriting recognition.
Implementation Method 1
each inductance coil has an input terminal and an output terminal... sensing changes in magnetic fields generated by an external stylus
Data Source
AI summary
An electronic paper display panel, a touch detecting method thereof and an electronic device are provided. The electronic paper display panel includes: a first substrate and a pixel electrode array which is arranged on the first substrate; an inductance coil array disposed between the first substrate and the pixel electrode array and including a plurality of inductance coils arranged in array, each inductance coil has an input terminal and an output terminal; a plurality of driving lines arranged with the plurality of inductance coils respectively, each driving line is electrically connected to the input terminal of the corresponding inductance coil; and a plurality of touch lines arranged with the plurality of inductance coils respectively, each touch line is electrically connected to the output terminal of the corresponding inductance coil.