Display device and a method of measuring a strain of the display device

Patent metadata

Field	Value
Publication number	US-9658145-B2
Application number	US-201414302009-A
Country	US
Kind code	B2
Filing date	Jun 11, 2014
Priority date	Jul 3, 2013
Publication date	May 23, 2017
Grant date	May 23, 2017

Abstract

A measurement pigment composition including pigment particles may be coated on a surrounding area of a display panel to form a strain measuring part. A strain of the display device may be measured by using 3D images of the strain measuring part.

First claim

What is claimed is:

1. A method of measuring a strain experienced by a display device, the method comprising:
coating a measurement pigment composition comprised of pigment particles on any portion of a surrounding non-display area of a display panel, a strain measuring part being defined by the measurement pigment composition coating, the surrounding non-display area of the display panel consisting of display panel surfaces not covered by device components interfacing with the display panel, the strain measuring part comprising at least one selected from the group consisting of an ultraviolet curable resin, a thermoplastic resin and a thermosetting resin;
obtaining a first three-dimensional image of the strain measuring part;
causing a shape of the strain measuring part to change by bending at least one portion of the display device including the display panel;
obtaining a second three-dimensional image of the strain measuring part; and
generating a strain of the display device by making a comparison between a plurality of the three-dimensional images of the strain measuring part.

2. The method of claim 1 , further comprising:
combining a polarization film with the display panel; and
combining a driving part with the display panel at a side of the polarization film.

3. The method of claim 2 , wherein the surrounding area of the display panel comprises a first coating area, a second coating area, and a third coating area, and wherein the first coating, area surrounds the driving pan, the second coating area surrounds the polarization film, and the third coating area is on a lower surface of the display panel, which is opposite to an upper surface of the display panel where the polarization film and the driving part are disposed.

4. The method of claim 1 , wherein the measurement pigment composition is coated by a dispensing, a screen printing, a spin coating, a slit coating, a bar coating, or a nozzle spraying to form the strain measuring part.

5. The method of claim 1 , wherein the pigment particles comprise a black pigment particle and a white pigment particle.

6. The method of claim 1 , the measurement of the strain of the display device comprising:
taking the first three-dimensional image of the display device before the display device is bent;
taking the second three-dimensional image of the display device after bending the display device;
comparing the first three-dimensional image with the second three-dimensional image; and
using a processing computer and software to determine the strain of the display device based on the comparison between the first three-dimensional image and the second three-dimensional image.

7. The method of claim 6 , wherein the bending of the display device is controlled by an operator.

8. The method of claim 1 , the method being comprised of obtaining the comparison by measuring distances between the pigment particles for the first and second three-dimensional images.

9. The method of claim 1 , further comprising the measuring of the strain using a three-dimensional (3D) image camera.

10. A display device, comprising:
a display panel; and
a strain measuring part comprising pigment particles disposed on an area surrounding the display panel to provide a representation of strain experienced by the area surrounding the display panel, strain experienced by the display device being amenable to measurement by comparing three-dimensional images of the strain measuring part, the surrounding area of the display panel comprised of display panel surfaces not covered by device components interfacing with the display panel, the three-dimensional images being obtained before and after bending of the display panel, the strain measuring part comprising at least one selected from the group consisting of an ultraviolet curable resin, a thermoplastic resin and a thermosetting resin.

11. The display device of claim 10 , wherein the pigment particles comprises at least one selected from the group consisting of lithopone, white lead, and carbon black.

12. The display device of claim 10 , the pigment particles comprising at least one selected from the group consisting of K 2 O, Fe 2 O 3 , Sb 2 O 3 , ZnO, P 2 O 5 , V 2 O 5 , TiO 2 ,Al 2 O 3 , WO 3 ,SnO, PbO, MgO, CaO, BaO, Li 2 O, Na 2 O, B 2 O 3 , TeO 2 , SiO 2 , Ru 2 O, Rh 2 O, CuO, Cr 2 O 3 , Na 2 S, and Bi 2 O 3 .

13. The display device of claim 10 , wherein a size of each pigment particle is about 0.1 μm to about 0.5 μm.

14. The display device of claim 10 , a. thickness of the display panel is about 100 μm to about 500 μm.

15. The display device of claim 10 , further comprising a polarization film disposed on the display and a driving part connected to the display panel.

16. The display device of claim 10 , wherein the strain measuring part is disposed on an upper surface of the display panel to have a shape surrounding the polarization film in a plan view.

17. The display device of claim 16 , wherein the strain measuring part is further disposed on a lower surface of the display panel.

18. The display device of claim 10 , wherein the strain measuring part is coupled with a three-dimensional (3D) image camera to obtain the representation of the strain.

19. A method of measuring a strain experienced by a display, the method comprising:
coating a measurement pigment composition comprised of pigment particles on an portion of a surrounding non-display area of a display panel, a strain measuring part being defined by the coating of measurement pigment composition, the surrounding non-display area of the display panel comprised of display panel surfaces not covered by device components interfacing with the display panel;
obtaining a first three-dimensional image of the strain measuring part;
bending at least one portion of the display device including the display panel, the bending causing a shape of the strain measuring part to change by the bending;
obtaining a second three-dimensional image of the strain measuring part;
comparing a plurality of the three-dimensional images of the strain measuring part to generate a strain measurement; and
using the measured strain Of the display device iteratively to design a display device including a display panel having a desired strain ratio in response to a selected external pressure, where delamination of any films disposed on or under the display panel is prevented.

Assignees

• Samsung Display Co Ltd

Inventors

• Jeong Chul-Woo
• Park Soon-Ryong
• Baek Seok-Gi
• So Jung-Ho
• Kim Tae-Eun

Classifications

• G01N3/20 Primary

  by applying steady bending forces (G01N3/26, G01N3/28 take precedence) · CPC title

• G01N2033/0095

  Physics · mapped topic

• G01N2033/0078

  Physics · mapped topic

• G09F9/00

  Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements (in which the variable information is permanently attached to a movable support G09F11/00; abacus G06C1/00; slide-rules G06G1/00) · CPC title

• G01B11/16 Primary

  for measuring the deformation in a solid, e.g. optical strain gauge · CPC title