Touch Display Device With Integrated Capacitive and Pressure Sensing
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Solution Overview
Problem
Conventional 3D touch display devices are structurally complex and costly due to the need for separate capacitor and pressure touch units, which complicates their design and increases manufacturing costs.
Innovation Solution
A touch display device featuring a substrate with a light emitting layer, encapsulation layer, and a touch layer comprising multi-metal layer touch electrode units wrapped around nodes to form coils, connected to a touch driver inspection circuit that monitors capacitance and pressure variations for 2D and 3D coordinate inspections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If opposite independent capacitor touch unit and pressure touch unit are employed to achieve 3D coordinate inspection, then touch inspection capability is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent combines the capacitor touch unit and pressure touch unit into a single integrated touch sensor unit. The touch sensor includes both a first capacitor electrode and a second capacitor electrode, along with a pressure-sensitive element, all integrated within one structural unit that can detect both capacitive changes and pressure forces, thereby reducing device complexity while maintaining 3D inspection capability
Solution Approach 2:
The integrated touch sensor unit serves multiple functions simultaneously: it detects touch position through capacitive sensing, measures pressure through the pressure-sensitive element, and provides both 2D and 3D coordinate inspection. This multi-functional design eliminates the need for separate independent units while achieving comprehensive touch inspection
2Measurement precision
If opposite independent capacitor touch unit and pressure touch unit are employed to achieve 3D coordinate inspection, then touch inspection capability is improved, but manufacturing cost increases
Solution Approach 1:
By merging the capacitor touch unit and pressure touch unit into a single integrated structure with shared substrates, electrodes, and encapsulation layers, the patent reduces the total number of manufacturing steps, materials required, and assembly operations, thereby lowering manufacturing cost while maintaining full 3D inspection capability
3Measurement precision
If traditional separate touch units are used, then 3D inspection is achieved, but device weight and size increase
Solution Approach 1:
The patent implements a nested structure where the pressure-sensitive element is positioned between the first and second capacitor electrodes, and all components are integrated within a single encapsulation layer system. This nested arrangement allows multiple functional elements to occupy overlapping spatial volumes, reducing overall device weight and size while maintaining 3D inspection capability
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 simplifies the touch layer structure, reduces manufacturing costs, and enhances the device's light weight and compactness while maintaining effective touch sensitivity and precision for both 2D and 3D inspections.
Implementation Method 1
configured to according to variation of a capacitance of the touch electrode units and monitor a touch position
Implementation Method 2
the first touch electrode wire and the second touch electrode wire are multi-metal layer structures each of which comprises a pressure-sensitive material layer
Data Source
AI summary
A touch display device is provided and includes a substrate, light emitting layer, encapsulation layer, a touch layer, and a touch driver inspection circuit. The touch layer includes a plurality of touch electrode units. The touch driver inspection circuit is connected to each of the touch electrode units the touch layer and is configured to monitor a touch position according to variation of a capacitance of the touch electrode units. The touch driver inspection circuit is further configured to monitor a pressure of the touch position according to variation of pressures on the touch electrode units.