Integrated Touch and Force Sensing in Display Panels
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Solution Overview
Problem
Current touch display apparatuses face challenges in reducing size and weight due to the additional force sensors required for detecting touch force, which complicates human-computer interaction and increases the size and weight of the device.
Innovation Solution
A display apparatus with integrated touch sensing and force sensing functions, utilizing a conductive layer and dielectric layer to form a force sensing device, where touch sensing pads and force sensing pads are electrically connected, allowing for simultaneous detection of touch position and force applied, without the need for separate force sensors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a force sensor is additionally arranged to detect touch force, then force sensing function is improved, but size and weight of display apparatus increase
Solution Approach 1:
The patent merges the force sensing function with the existing touch panel structure by integrating force sensing pads into the conductive layer that is already part of the touch panel assembly. This combination eliminates the need for separate force sensors, achieving force sensing capability without adding significant weight or size to the display apparatus.
Solution Approach 2:
The conductive layer in the touch panel is designed to serve multiple functions: it acts as both the conductive element for touch sensing and as the force sensing pads for detecting applied force. This multi-functionality allows the same structural component to perform both touch position detection and force measurement, avoiding additional weight from dedicated force sensors.
2Adaptability or versatility
If a force sensor is additionally arranged to detect touch force, then force sensing function is improved, but size of display apparatus increases
Solution Approach 1:
The force sensing pads are merged with the conductive layer of the touch panel, utilizing the existing spatial structure. This integration ensures that the force sensing function is achieved within the current footprint of the display apparatus without requiring additional space or increasing the overall size.
Solution Approach 2:
The force sensing pads are nested within the conductive layer structure of the touch panel. By placing the force sensing functionality inside the existing conductive layer, the patent achieves force sensing capability without adding external components that would increase the display apparatus size.
3Device complexity
If touch sensing pads and force sensing pads are integrated in the conductive layer, then device complexity is reduced, but manufacturing precision requirements increase
Solution Approach 1:
The integration of touch sensing pads and force sensing pads into the single conductive layer simplifies the overall device structure by eliminating separate force sensor components. While this merging reduces structural complexity, it does require precise manufacturing to ensure proper alignment and functionality of the integrated pads.
Solution Approach 2:
The conductive layer is designed to fulfill multiple functions simultaneously - serving as both touch sensing and force sensing elements. This universal design reduces the number of separate components needed, simplifying the device structure, though it demands higher manufacturing precision to ensure the multi-functional pads are correctly positioned and sized.
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 detection of touch position and force applied, reducing the size and weight of the display apparatus while maintaining high sensitivity and accuracy, by integrating the sensing functions within the existing display panel structure.
Implementation Method 1
Capacitive touch panels become a main touch technology used in current middle-range and high-end consumer electronics products due to features such as high accuracy, multi-touch, and high touch resolution
Data Source
AI summary
A display apparatus with touch sensing and force sensing functions includes a display panel, a first touch device, a conductive layer and a dielectric layer. The first touch device includes multiple touch sensing pads. The conductive layer includes multiple force sensing pads electrically connected to each other, where the touch sensing pads separately overlap the corresponding force sensing pads in a vertical projection direction. The dielectric layer is disposed between the conductive layer and the first touch device. The touch sensing pads, the dielectric layer and the force sensing pads form a force sensing device.