Touch Display Panel Pressure Sensing Integration
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Solution Overview
Problem
Conventional touch display panels with pressure sensing functions suffer from increased thickness due to the additional pressure sensor and required cell gap, which compromises their design and functionality.
Innovation Solution
Integrating a pressure sensing capacitor within the touch display panel by placing a first pressure sensing electrode on the top substrate and a second pressure sensing electrode on the bottom substrate, with a liquid crystal layer between them, allowing for the elimination of an external pressure sensor and associated cell gap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an external pressure sensor is added under the backlight module, then pressure sensing function is achieved, but the overall thickness of the display panel increases
Solution Approach 1:
The patent merges the pressure sensing function with the existing touch display panel structure by integrating pressure sensing electrodes into the top and bottom substrates. This combines multiple functions (display and pressure sensing) into a single integrated structure, eliminating the need for a separate external pressure sensor and reducing overall thickness.
Solution Approach 2:
The top and bottom substrates of the touch display panel are designed to serve dual purposes: as structural components for display and as electrodes for pressure sensing. This multi-functionality allows the same components to perform multiple roles, eliminating the need for additional dedicated pressure sensing components.
2Reliability
If a cell gap is maintained between the pressure sensor and backlight module, then proper sensor operation is ensured, but the display panel thickness increases
Solution Approach 1:
The pressure sensing electrodes are integrated directly into the existing substrates of the touch display panel, merging the pressure sensing function with the display structure. This eliminates the need for a separate cell gap between an external pressure sensor and the backlight module.
Solution Approach 2:
The patent extracts the pressure sensing function from a separate external component and integrates it directly into the touch display panel substrates. This removes the need for the additional cell gap that would be required if an external pressure sensor were used.
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 integration reduces the overall thickness of the display panel while maintaining pressure sensing capabilities, enhancing its design efficiency and functionality.
Implementation Method 1
The first pressure sensing electrode and the second pressure sensing electrode form a pressure sensing capacitor
Data Source
AI summary
A touch display panel includes a top substrate, a bottom substrate, a first pressure sensing electrode, a second pressure sensing electrode and a liquid crystal layer. The top substrate has a color filter layer. The bottom substrate is stacked under the top substrate. The first pressure sensing electrode is disposed on a first surface of the top substrate. The second pressure sensing electrode is disposed on a surface of the bottom substrate. Therein, the first pressure sensing electrode and the second pressure sensing electrode form a pressure sensing capacitor. The liquid crystal layer is disposed between the top substrate and the bottom substrate and disposed between the first pressure sensing electrode and the second pressure sensing electrode.