Touch Display Panel Pressure Sensing Capacitor Design
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Solution Overview
Problem
Conventional touch display panels with integrated pressure sensing capabilities face thickness increases due to the need for a gap between the pressure sensor and the backlight module, which affects the device's thickness and efficiency.
Innovation Solution
A touch display panel design featuring a first and second pressure sensing capacitor connected in series, where both electrodes are disposed on the substrate with a compression zone between each electrode and a conductor, allowing for pressure measurement without increasing the device's thickness.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a pressure sensor is additionally disposed under the backlight module to provide pressure sensing function, then pressure sensing capability is improved, but the thickness of the electronic apparatus is increased due to the required gap between pressure sensor and backlight module
Solution Approach 1:
The patent merges the pressure sensing function with the existing substrate structure by forming pressure sensing capacitors on the substrate. The first and second pressure sensing electrodes are integrated onto the substrate, eliminating the need for a separate pressure sensor module and the associated gap, thus achieving pressure sensing without increasing device thickness
Solution Approach 2:
The patent transitions from a three-dimensional stacked structure (pressure sensor below backlight module with gap L1) to a two-dimensional planar structure on the substrate. The pressure sensing capacitors are formed on the same plane as the substrate, removing the vertical thickness requirement and enabling pressure sensing within the existing device profile
2Measurement precision
If a gap is kept between the pressure sensor and backlight module to accommodate deformation, then pressure sensing accuracy is improved, but the device thickness is increased
Solution Approach 1:
The substrate itself serves dual purposes: as the structural base and as the sensing element. The first and second pressure sensing electrodes are formed on the substrate, creating capacitors that directly measure pressure-induced substrate deformation without requiring a separate gap structure
Solution Approach 2:
The substrate performs self-sensing by utilizing its own deformation characteristics. The pressure sensing capacitors are formed using the substrate as one electrode, allowing the substrate to sense its own deformation under pressure without requiring external sensing components or additional spacing
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 pressure measurement while reducing the overall thickness of the touch display panel by integrating the pressure sensing functionality directly onto the substrate, enhancing the panel's efficiency and design.
Implementation Method 1
A compression zone exists between the first pressure sensing electrode and the conductor, so as to form a first pressure sensing capacitor. The second pressure sensing electrode is disposed on the first substrate and disposed above the conductor. The compression zone exists between the second pressure sensing electrode and the conductor, so as to form a second pressure sensing capacitor connected in series with the first pressure sensing capacitor.
Data Source
AI summary
A touch display panel and a manufacturing method thereof are provided. The touch display panel includes a substrate, a conductor, a first pressure sensing electrode and a second pressure sensing electrode. The conductor is stacked under the substrate, and the conductor is not connected to a bias. The first pressure sensing electrode is disposed on the substrate and disposed above the conductor. A compression zone exists between the first pressure sensing electrode and the conductor, so as to form a first pressure sensing capacitor. The second pressure sensing electrode is disposed on the substrate and disposed above the conductor. The compression zone exists between the second pressure sensing electrode and the conductor, so as to form a second pressure sensing capacitor connected in series with the first pressure sensing capacitor.