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Device and method for improving force measurement accuracy of piezoelectric touch screen under step force

A technology of touch screen and step force, applied in the direction of electrical digital data processing, input/output process of data processing, instruments, etc., can solve problems such as unstable response relationship, achieve strong portability, improve force measurement accuracy, improve The effect of accuracy

Active Publication Date: 2021-06-29
BEIHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, successful commercial applications of piezoelectric screens are still rare, and an important defect that needs to be overcome is the unstable response relationship between the output voltage value and the force loaded on the piezoelectric material.

Method used

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  • Device and method for improving force measurement accuracy of piezoelectric touch screen under step force
  • Device and method for improving force measurement accuracy of piezoelectric touch screen under step force
  • Device and method for improving force measurement accuracy of piezoelectric touch screen under step force

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Experimental program
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Effect test

Embodiment 1

[0051] Embodiment 1 A device for improving the force measurement accuracy of a piezoelectric touch screen under step force

[0052] This embodiment includes a prestress detection circuit, a piezoelectric signal detection circuit and a signal acquisition unit.

[0053] like figure 1As shown, the signal acquisition unit is implemented by a piezoelectric device, which includes a first protective layer, a first electrode layer, a piezoelectric material layer, a ground electrode layer and a second protective layer arranged in sequence from top to bottom. The first electrode layer and the second electrode layer are used as the output terminals of the signal acquisition unit. The charge generated by the forward piezoelectric effect is drawn out from the first electrode layer and the second electrode layer, and the ground electrode layer is grounded through the connected lead wire. Wherein, the first protective layer and the second protective layer are made of PET plastic, and the pi...

Embodiment 2

[0058] Embodiment 2 A method for improving the force measurement accuracy of a piezoelectric touch screen under step force

[0059] This embodiment adopts embodiment 1 to realize, such as Figure 5 As shown, follow the steps in the following order:

[0060] 1. Detection of prestress F static

[0061] S1. The control pin of the microcontroller sends a command to the multiplexer through the switch control pin of the multiplexer, and connects the timer output pin of the microcontroller with the piezoelectric material layer, and the microcontroller A 3.3V pulse signal with a length of 1us is generated by the timer and loaded on the piezoelectric material layer to charge the piezoelectric material layer to 3.3V;

[0062] S2. Once the time of 1us is up, the control pin of the microcontroller sends a command to the multiplexer through the switch control pin of the multiplexer, and the piezoelectric material layer is connected to the positive input terminal of the comparator. The ...

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Abstract

The invention discloses a device for improving the force measurement accuracy of a piezoelectric touch screen under step force, which includes a prestress detection circuit, a piezoelectric signal detection circuit and a signal acquisition unit; the prestress detection circuit includes a microcontroller; The control pin is connected to the switch control pin of the multiplexer, the timer output pin of the microcontroller is connected to the piezoelectric material layer through the multiplexer, and the piezoelectric material layer is compared with the The positive input terminal of the comparator is connected, the negative input terminal of the comparator is connected with the DAC pin of the microcontroller, and the output terminal is connected with the interrupt pin of the microcontroller; the piezoelectric signal detection circuit includes a charge-voltage conversion circuit. The invention also discloses a method for improving the force measurement accuracy of the piezoelectric touch screen under the step force. The invention has a simple structure, determines the size of the prestress on the piezoelectric film, thereby corrects the piezoelectric coefficient, improves the accuracy of the force measurement of the piezoelectric material, and is suitable for the technical field of piezoelectric touch screen equipment.

Description

technical field [0001] The invention belongs to the technical field of touch screen equipment and is used for improving the precision of the touch screen, in particular to a device and method for improving the force measurement accuracy of a piezoelectric touch screen under step force. Background technique [0002] Touch screens are being used on a large scale in many electronic products, from mobile phones that people use every day to medical equipment. Traditional touch screen positioning and detection use capacitance or resistance, and whether it is a capacitive screen or a piezoresistive screen, they all have their own defects. With the improvement of people's requirements for touch screen interaction, the structural and performance advantages of piezoelectric screens will make the wide application of piezoelectric materials on touch screens an inevitable trend in the future. [0003] In recent years, around the characteristics of touch screens, many researchers have ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F3/041
CPCG06F3/0412G06F3/0414G06F3/0416G06F2203/04105
Inventor 高硕石佳卉陈君亮代晏宁徐立军
Owner BEIHANG UNIV
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