Display device using thermochromic pigment and method for manufacturing the same

Patent metadata

Field	Value
Publication number	US-12130506-B2
Application number	US-202217737489-A
Country	US
Kind code	B2
Filing date	May 5, 2022
Priority date	Jul 16, 2021
Publication date	Oct 29, 2024
Grant date	Oct 29, 2024

Abstract

A display device includes a display panel including a first area, a second area, and a bending area disposed between the first area and the second area, the bending area having a curvature radius, a data driver disposed on the display panel and overlapping the second area in a plan view, and a bending protection layer disposed on the display panel and the data driver and overlapping the first area in a plan view, the bending area, and the second area. The bending protection layer includes a thermochromic pigment having a light transmittance that varies according to a temperature.

First claim

What is claimed is:

1. A display device comprising:
a display panel comprising:
a first area;
a second area; and
a bending area disposed between the first area and the second area, the bending area having a curvature radius;

a data driver disposed on the display panel and overlapping the second area in a plan view; and
a bending protection layer disposed on the display panel and the data driver and overlapping the first area, the bending area, and the second area in the plan view,
wherein the bending protection layer comprises a thermochromic pigment having a light transmittance.

2. The display device of claim 1 , wherein
the light transmittance of the bending protection layer at a temperature lower than a first temperature is 1% or less, and
the light transmittance of the bending protection layer at another temperature equal to or higher than the first temperature is 50% or more.

3. The display device of claim 1 , wherein the bending protection layer exhibits a first color at a temperature lower than a first temperature and is transparent at another temperature equal to or higher than the first temperature.

4. The display device of claim 3 , wherein the first color is black.

5. The display device of claim 1 , wherein a light transmittance of the thermochromic pigment varies according to a temperature.

6. The display device of claim 1 , wherein the thermochromic pigment comprises an electron acceptor and an electron donor.

7. The display device of claim 1 , wherein the thermochromic pigment comprises liquid crystal molecules.

8. The display device of claim 1 , wherein the bending protection layer covers the data driver.

9. The display device of claim 1 , further comprising:
a printed circuit board bonded to the second area,
wherein the bending protection layer overlaps at least a portion of the printed circuit board in the plan view.

10. The display device of claim 1 , further comprising:
an anti-reflection layer disposed on the display panel and overlapping the first area in the plan view,
wherein a portion of the bending protection layer which overlaps the first area of the display panel, does not overlap the anti-reflection layer in the plan view.

11. The display device of claim 1 , wherein
the first area comprises a first non-folding area, a folding area, and a second non-folding area which are sequentially disposed in a direction, and
the folding area is folded with respect to a folding axis.

12. A display device comprising:
a display panel comprising:
a first area;
a second area; and
a bending area disposed between the first area and the second area, the bending area having a curvature radius;

a data driver disposed on the display panel and overlapping the second area in a plan view; and
a bending protection layer disposed on the display panel and overlapping the first area, the bending area, and the second area in the plan view and that covers the data driver,
wherein the bending protection layer comprises a reversible thermochromic pigment.

13. The display device of claim 12 , wherein the reversible thermochromic pigment exhibits a black color at a temperature lower than a first temperature and is transparent at another temperature equal to or higher than the first temperature.

14. The display device of claim 12 , wherein
the bending protection layer further comprises a base resin, and
the base resin comprises at least one of an acrylic-based polymer, a urethane-based polymer, a silicon-based polymer, and an imide-based polymer.

15. A method for manufacturing a display device, the method comprising:
providing a resin comprising a base resin, a thermochromic pigment, and a photoinitiator on a first area, a bending area, and a second area;
applying heat to the resin to generate a temperature condition equal to or higher than a first temperature to form a preliminary bending protection layer; and
providing light having a first wavelength region to the preliminary bending protection layer to form a bending protection layer, wherein
the display device comprises a display panel comprising the first area, the bending area, the second area which are disposed sequentially in a direction, and a data driver disposed on the display panel, the data driver overlapping the second area.

16. The method of claim 15 , wherein the thermochromic pigment exhibits a first color at a temperature lower than the first temperature and is transparent at-a another temperature equal to or higher than the first temperature.

17. The method of claim 15 , wherein the first temperature is in a range of 30° C. to 80° C.

18. The method of claim 15 , wherein the forming of the preliminary bending protection layer comprises providing light having a second wavelength region to apply heat to the resin, the second wavelength region and the first wavelength region being different.

19. The method of claim 18 , wherein the photoinitiator is activated by the light having the first wavelength region.

20. The method of claim 15 , wherein the providing of the resin comprises applying the resin to cover the data driver.

Assignees

• Samsung Display Co Ltd

Inventors

• Ryu Tae Yong
• Park Kyoungwoo
• Lee Hyoungjoo

Classifications

• G02F1/132

  Thermal activation of liquid crystals exhibiting a thermo-optic effect · CPC title

• C09C2210/00

  Special effects or uses of interference pigments · CPC title

• C09D201/00

  Coating compositions based on unspecified macromolecular compounds · CPC title

• C09D5/26

  Thermosensitive paints · CPC title

• G09F9/301 Primary

  flexible foldable or roll-able electronic displays, e.g. thin LCD, OLED · CPC title