Display panel including piezoelectric device and method for compensating for properties of piezoelectric device

Patent metadata

Field	Value
Publication number	US-2016209922-A1
Application number	US-201514749203-A
Country	US
Kind code	A1
Filing date	Jun 24, 2015
Priority date	Jan 15, 2015
Publication date	Jul 21, 2016
Grant date	—

Abstract

There is provided a display panel including a piezoelectric device and a method for compensating properties of a piezoelectric device. According to the an exemplary embodiment of the present disclosure, the display panel includes: a panel; and a piezoelectric device coupled with the panel, wherein the piezoelectric device includes: a plurality of piezoelectric elements disposed at different positions of the panel and each configured to generate vibrations according to a driving signal; a driver configured to supply the driving signal to the plurality of piezoelectric elements; a plurality of acceleration sensors configured to detect acceleration information of vibrations in different regions of the panel; and a compensator configured to control the driving signal to compensate for property deviations of the plurality of piezoelectric elements, based on the acceleration information.

First claim

What is claimed is:

1 . A display panel, comprising:
a panel; and a piezoelectric device coupled with the panel, wherein the piezoelectric device includes: a plurality of piezoelectric elements disposed at different positions of the panel and each configured to generate vibrations according to a driving signal; a driver configured to supply the driving signal to the plurality of piezoelectric elements; a plurality of acceleration sensors configured to detect acceleration information of vibrations in different regions of the panel; and a compensator configured to control the driving signal to compensate for property deviations of the plurality of piezoelectric elements based on the acceleration information.

2 . The display panel of claim 1 , wherein:
the compensator is configured to calculate the property deviations based on deviations in the acceleration information.

3 . The display panel of claim 1 , wherein:
the compensator is configured to divide the plurality of piezoelectric elements into a plurality of groups corresponding to the plurality of acceleration sensors one-to-one, depending on each position of the plurality of acceleration sensors, and the property deviations for the plurality of groups are calculated based on deviations of the acceleration information detected by the plurality of acceleration sensors.

4 . The display panel of claim 1 , wherein the compensator is configured to:
estimate acceleration information corresponding to each piezoelectric element by extrapolating/interpolating the acceleration information detected by the plurality of acceleration sensors, and calculate the property deviations based on a deviation of the acceleration information estimated for each piezoelectric element.

5 . The display panel of claim 1 , further comprising:
a memory storing temperature property information that describes a relationship between a change in physical properties of a piezoelectric element and temperature; and a temperature sensor disposed on the panel to detect temperature information, wherein the compensator is configured to control the driving signal based on the temperature information and the temperature property information.

6 . The display panel of claim 5 , wherein:
the temperature property information includes piezoelectric constants each corresponding to a temperature, and the compensator is configured to read the piezoelectric constant corresponding to the temperature information from the memory and control the driving signal using a reference piezoelectric constant and the driving signal at a reference temperature and the piezoelectric constant corresponding to the temperature information.

7 . The display panel of claim 1 , wherein:
the compensator is configured to detect the acceleration information using the plurality of acceleration sensors while the same driving signal is supplied to the plurality of piezoelectric elements.

8 . A method for compensating for properties of a piezoelectric device including a plurality of piezoelectric elements, the method comprising:
applying the same driving signal to the plurality of piezoelectric elements; detecting, by a plurality of acceleration sensors spaced apart from each other, acceleration information due to an output of the plurality of piezoelectric elements; calculating property deviations of the plurality of piezoelectric elements based on the acceleration information; and controlling driving signals output to the plurality of piezoelectric elements to compensate for the property deviations.

9 . The method of claim 8 , wherein:
the property deviation is calculated based on the deviation in the acceleration information.

10 . The method of claim 8 , wherein the calculating of the property deviation includes:
estimating acceleration information corresponding to each piezoelectric element by extrapolating/interpolating the acceleration information detected by the plurality of acceleration sensors, and calculating the property deviations based on a deviation of the acceleration information estimated for each piezoelectric element.

Assignees

• Samsung Display Co Ltd

Inventors

• Kim Beom Shik
• Lee Jong Seo

Classifications

• G06F3/0412

  Digitisers structurally integrated in a display · CPC title

• G06F3/016 Primary

  Input arrangements with force or tactile feedback as computer generated output to the user · CPC title

• H01L41/09

  Electricity · mapped topic

• H10N30/802

  Circuitry or processes for operating piezoelectric or electrostrictive devices not otherwise provided for, e.g. drive circuits · CPC title

• G06F1/206

  comprising thermal management · CPC title