Integrated Display Sensor Layout for Touch Pressure Detection
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Solution Overview
Problem
Current touch sensors in display devices can only detect the position of touch inputs and lack the capability to sense the pressure applied, limiting their functionality and accuracy in providing user inputs.
Innovation Solution
A display device with an input sensor and pressure sensor electrode configuration, including a first and second conductive layer with a pressure sensor electrode between them, and a mesh structure, capable of sensing pressure through nano-particles, to differentiate between input and non-input sections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional touch sensor is used, then the position of touch input can be detected, but the pressure of touch input cannot be sensed
Solution Approach 1:
The patent combines the touch sensor and pressure sensor into a single integrated sensor structure. The first and second conductive layers serve dual purposes as both touch sensing electrodes and pressure sensing electrodes, eliminating the need for separate sensor systems and reducing overall device complexity while enabling both position and pressure detection
Solution Approach 2:
The conductive layers are designed to perform multiple functions simultaneously: they act as touch sensing electrodes for position detection and as pressure sensing electrodes for pressure detection. This multi-functionality allows a single sensor structure to provide both touch location and pressure information without requiring additional components
2Measurement precision
If the sensor area is increased to improve touch detection accuracy, then the dummy area must also increase, leading to larger overall sensor size
Solution Approach 1:
The patent applies different properties to different areas of the sensor: the sensor area uses conductive layers configured for high-sensitivity touch detection, while the dummy area uses the same conductive layers but configured for pressure detection only. This local differentiation allows the sensor to achieve high touch detection accuracy in the sensor area without requiring a proportional increase in the overall sensor area
3Strength
If a thick window is used to protect the input sensor, then the pressure sensing sensitivity is reduced
Solution Approach 1:
The patent changes the thickness parameter of the window from conventional thick glass to a thin glass film with thickness of 20 μm to 100 μm. This parameter change enables the window to maintain adequate mechanical protection while allowing sufficient pressure transmission to the underlying sensor layers, thereby preserving pressure sensing sensitivity
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 accurate input detection by sensing the pressure of touch inputs, enhancing user interaction with virtual keyboards or touch pads by distinguishing between input and non-input sections with improved sensitivity.
Implementation Method 1
a pressure sensor electrode disposed between the first dummy electrode and the second dummy electrode
Data Source
AI summary
Disclosed is a display device including a display panel that displays an image on a display surface and an input sensor having a sensor area and a dummy area defined therein. The input sensor includes a first conductive layer that is disposed on the display panel and that includes a first dummy electrode disposed in the sensor area and the dummy area, a second conductive layer that is disposed on the first conductive layer and that includes a sensor electrode disposed in the sensor area and a second dummy electrode disposed in the dummy area, and a pressure sensor electrode disposed between the first dummy electrode and the second dummy electrode.