Flexible Circuit Board Pressure Sensor Integration
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Solution Overview
Problem
Existing display devices require additional conductive members to measure pressure changes, which can complicate the sensing mechanism and reduce accuracy.
Innovation Solution
A display device with a pressure sensor integrated into a flexible circuit board, utilizing a capacitor with electrodes on its surface to sense pressure changes without additional conductive members, featuring a folded or bent design and an elastic layer to maintain constant capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If additional conductive members are used to measure pressure changes, then pressure sensing capability is achieved, but device complexity increases and measurement precision decreases
Solution Approach 1:
The pressure sensing function is merged with the flexible circuit board by integrating capacitor electrodes directly into the board structure. The first electrode is formed on the flexible circuit board, and the second electrode is formed on the display panel, eliminating the need for separate pressure sensing conductive members. This integration reduces device complexity while maintaining pressure sensing capability through capacitance change detection when pressure is applied.
Solution Approach 2:
The flexible circuit board serves multiple functions: it provides electrical connection to the display panel and simultaneously acts as a pressure sensing element through its integrated capacitor electrodes. The first electrode on the flexible circuit board and the second electrode on the display panel form a capacitor that detects pressure-induced capacitance changes, allowing the same structure to perform both circuit board and pressure sensor functions.
2Device complexity
If electrodes are disposed on flexible circuit board surfaces, then pressure sensing is enabled without additional conductive members, but electrode positioning and alignment precision must be maintained
Solution Approach 1:
The first electrode is pre-formed on the flexible circuit board during its manufacturing process, and the second electrode is pre-formed on the display panel before assembly. This preliminary formation of electrodes ensures proper positioning and alignment is built into the manufacturing process itself, reducing the need for post-assembly alignment adjustments and maintaining manufacturing precision while keeping the sensing mechanism simple.
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 precise measurement of touch pressure intensity by detecting changes in capacitance without external conductive layers, enhancing accuracy and simplifying the sensing mechanism.
Implementation Method 1
a pressure sensor including a first electrode and a second electrode. The pressure sensor is configured to sense a change of capacitance of a capacitor, which is formed between the first electrode and the second electrode, in accordance with a pressure applied thereto
Implementation Method 2
an elastic layer which is disposed between the first area and the second area
Data Source
AI summary
A display device includes a display panel configured to display an image on a front surface thereof, and a flexible circuit board connected to the display panel and configured to drive the display panel. The display device further includes a pressure sensor including a first electrode and a second electrode. The pressure sensor is configured to sense a change of capacitance of a capacitor, which is formed between the first electrode and the second electrode, in accordance with a pressure applied thereto. The flexible circuit board includes a first surface and a second surface facing the first surface. The first electrode and the second electrode are disposed on the first surface or the second surface.