Integrated Force Touch Sensor with Extension Parts
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Solution Overview
Problem
The implementation of force touch function in devices like the iPhone requires additional components such as a force sensor, driver IC, and peripheral circuits, increasing cost and thickness, and complicating the manufacturing process due to separate design and assembly of touch and force sensors.
Innovation Solution
A touch substrate with a base substrate and a force sensor comprising multiple extension parts and connection parts, where the extension parts are sequentially connected to increase resistance change detection accuracy, allowing for integrated force and touch sensing in the same layer, reducing thickness and complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If force sensor, driver IC, and peripheral circuits are added separately to implement force touch function, then force touch detection capability is improved, but device thickness and manufacturing complexity increase
Solution Approach 1:
The patent combines the force sensor and touch sensor into a single integrated sensor structure. The sensor includes both a force sensing unit with extension parts for detecting touch force magnitude and a touch sensing unit for detecting touch position, allowing both functions to be implemented in one component rather than requiring separate force sensors, driver ICs, and peripheral circuits
Solution Approach 2:
The integrated sensor serves multiple functions simultaneously: it detects both touch position (through the touch sensing unit) and touch force magnitude (through the force sensing unit with extension parts). This multi-functional design eliminates the need for separate dedicated force sensing components and their associated control circuits
2Measurement precision
If force sensor, driver IC, and peripheral circuits are added separately to implement force touch function, then force touch detection capability is improved, but device thickness increases
Solution Approach 1:
The patent combines the force sensor and touch sensor into a single integrated sensor structure. The sensor includes both a force sensing unit with extension parts for detecting touch force magnitude and a touch sensing unit for detecting touch position, allowing both functions to be implemented in one component rather than requiring separate force sensors, driver ICs, and peripheral circuits
Solution Approach 2:
The force sensing unit is nested within the same layer as the touch sensing unit. The extension parts of the force sensing unit are arranged in a compact configuration that allows them to be contained within the overall sensor structure, reducing the vertical space required compared to separate stacked components
3Measurement precision
If separate design and assembly of touch and force sensors are used, then force touch detection capability is improved, but manufacturing complexity increases
Solution Approach 1:
The patent combines the force sensor and touch sensor into a single integrated sensor structure. The sensor includes both a force sensing unit with extension parts for detecting touch force magnitude and a touch sensing unit for detecting touch position, allowing both functions to be implemented in one component rather than requiring separate force sensors, driver ICs, and peripheral circuits
Solution Approach 2:
The sensor is segmented into functional units (force sensing unit with extension parts and touch sensing unit) that can be designed and manufactured as an integrated structure using standard thin-film fabrication processes, simplifying the manufacturing process compared to assembling separate components
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 enhances the accuracy and effectiveness of force touch detection while reducing the thickness and manufacturing complexity of touch display devices by integrating force and touch sensors, allowing for improved user experience and cost efficiency.
Implementation Method 1
outputting a force signal according to a change in voltage difference on two ends of the force sensing unit to determine a magnitude of a touch force, the change in voltage difference on two ends of the force sensing unit caused by a change in resistance value of the force sensing unit under an action of an external force
Data Source
AI summary
A touch substrate, a manufacturing and driving method thereof and a touch display device are provided. The touch substrate includes: a base substrate and a force sensor being located on the base substrate and including at least one force sensing unit, the force sensing unit including a plurality of extension parts and at least one connection part, the plurality of extension parts extending along a first direction X, the plurality of extension parts being sequentially connected by the at least one connection part. The touch substrate can increase the change in resistance caused by the touch force so as to facilitate detection of the change in touch force by the detection chip.