Display Device Force Sensor Integrated PCB Structure
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Solution Overview
Problem
Existing display devices with force sensors have unstable connections to printed circuit boards (PCBs) and complex structures, which affect the reliability and efficiency of pressure sensing.
Innovation Solution
A display device design that includes a display panel, a printed circuit board connected to the panel, an elastic element, and conductive elements forming capacitance, with a conductive sheet or tape attached to the panel and a sensing electrode on the PCB, allowing for robust connection and simplified structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a separate flexible printed circuit board (FPCB) is used to connect the force sensor and PCB, then the force sensor can be connected to the PCB, but the connection becomes unstable and the structure becomes complicated
Solution Approach 1:
The patent merges the force sensor connection structure with the PCB by directly integrating the force sensor onto the PCB substrate, eliminating the need for a separate FPCB. This integration combines multiple functions (sensing and connection) into a single unified structure, resolving the contradiction between connection stability and structural complexity
Solution Approach 2:
The patent extracts and removes the separate FPCB component from the system, keeping only the essential PCB structure. By taking out the unnecessary intermediate FPCB layer, the design achieves more stable connections while simplifying the overall structure
2Ease of manufacture
If a separate flexible printed circuit board is used for force sensor connection, then the sensor can be connected, but the overall structure becomes complicated
Solution Approach 1:
The force sensor and PCB are merged into a single integrated structure, reducing the number of discrete components that need to be manufactured and assembled. This integration simplifies the manufacturing process by eliminating the need to separately produce and connect FPCB 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 design enhances the stability and reliability of pressure sensing by eliminating the need for a separate flexible printed circuit board and simplifying the structure, while maintaining effective capacitance measurement for touch pressure detection.
Implementation Method 1
a first conductor disposed between the elastic element and the printed circuit board; and a second conductor disposed between the elastic element and the display panel, and forming a capacitance with the first conductor
Implementation Method 2
an elastic element disposed between the display panel and the printed circuit board
Data Source
AI summary
A display device including: a display panel; a printed circuit board connected to the display panel; an elastic element disposed between the display panel and the printed circuit board; a first conductor disposed between the elastic element and the printed circuit board; and a second conductor disposed between the elastic element and the display panel, and forming a capacitance with the first conductor, wherein the printed circuit board includes a first pad connected to the first conductor.