DISPLAY PANEL INCLUDING PIEZOELECTRIC DEVICE AND METHOD FOR COMPENSATING FOR PROPERTIES OF PIEZOELECTRIC DEVICE

• US 20160209922A1
• Filed: 06/24/2015
• Published: 07/21/2016
• Est. Priority Date: 01/15/2015
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: KIM, Beom Shik, LEE, Jong Seo
• Granted Patent: US 9,804,676 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 1/206 comprising thermal management
• CPC Class Codes: G06F 3/016 Input arrangements with force or tactile feedback as computer generated output to the user
• CPC Class Codes: G06F 3/041 Digitisers, e.g. for touch screens or touch pads, characterised by the transducing means
• CPC Class Codes: G06F 3/0412 Digitisers structurally integrated in a display
• CPC Class Codes: G06F 3/0418 for error correction or compensation, e.g. based on parallax, calibration or alignment
• CPC Class Codes: H10N 30/802 Drive or control circuitry or methods for piezoelectric or electrostrictive devices not otherwise provided for

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.

Claims

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.