DISPLAY PANEL AND DISPLAY DEVICE HAVING THE SAME

• US 20140146273A1
• Filed: 09/04/2013
• Published: 05/29/2014
• Est. Priority Date: 11/23/2012
• Status: Active Grant

• Current Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Original Assignee: Samsung Display Company Limited (Samsung Electronics Co. Ltd.)
• Inventors: Do, Hee-Wook, Suh, Duck-Jong, Lee, Jung-Hun, Cho, Seon-Ah, KIM, SANG-JAE, Ki, Boo-Kan, Kim, Ji-Hye, Park, Jae-Won, Lee, Hyoung-Joo, Hong, Hyo-Sung
• Granted Patent: US 9,436,034 B2
• Time in Patent Office: Days
• US Class Current: 349/65
• CPC Class Codes: G02F 1/133524 Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence

Abstract

A display panel includes a first substrate, a second substrate, a liquid crystal layer, a first polarizer, a second polarizer and a viewing angle control layer. The second substrate faces the first substrate. A liquid crystal layer is disposed between the first substrate and the second substrate. A first polarizer is disposed on a lower surface of the first substrate and includes a first polarizing layer and a second polarizing layer stacked on each other. A second polarizer is disposed on an upper surface of the second substrate. A viewing angle control layer is disposed on the first polarizer and is configured to control a viewing angle of a column direction of the display panel.

Claims

1. A display panel, comprising:

a first substrate;

a second substrate facing the first substrate;

a liquid crystal layer disposed between the first substrate and the second substrate;

a first polarizer disposed on a lower surface of the first substrate and including a first polarizing layer and a second polarizing layer stacked on each other;

a second polarizer disposed on an upper surface of the second substrate; and

a viewing angle control layer disposed on the first polarizer, wherein the viewing angle control layer is configured to control a viewing angle of a column direction of the display panel.

2. The display panel of claim 1, wherein the viewing angle control layer is disposed on the upper surface of the second polarizer.

3. The display panel of claim 1, wherein the viewing angle control layer is disposed between the first substrate and the first polarizer.

4. The display panel of claim 1, wherein the first polarizer is a reflection polarizer, and the second polarizer is an absorption polarizer.

5. The display panel of claim 1, wherein the first polarizer and the second polarizer is a reflection polarizer.

6. The display panel of claim 1, wherein an absorption axis of the second polarizer is parallel to a reflection axis of the first polarizer.

7. The display panel of claim 1, wherein the viewing angle control layer comprises a viewing angle control film, and the viewing angle control film includes a base sheet and a protrusion portion protruding from an upper surface of the base sheet and extending in a direction.

8. The display panel of claim 7, wherein an absorption axis of the viewing angle control layer is parallel to a reflection axis of the first polarizer.

9. The display panel of claim 1, wherein the viewing angle control layer comprises a pattern retarder.

10. The display panel of claim 9, wherein the pattern retarder comprises:

a base layer having a birefringence;

a pattern retarding layer disposed on a lower surface of the base layer and including patterns having a different optical axis from each other; and

an adhesive layer disposed on a lower surface of the pattern retarding layer.

11. The display panel of claim 10, wherein the pattern retarding layer comprises:

a first retarder configured to convert a first light to a first polarization;

a second retarder configured to convert a second light to a second polarization; and

a black matrix disposed on lower surfaces of the first retarder and the second retarder to cover boundary portions between the first retarder and the second retarder.

12. The display panel of claim 11, wherein the black matrix is parallel to a reflection axis of the first polarizer.

13. The display panel of claim 1, wherein the viewing angle control layer comprises a parallax barrier layer, and the parallax barrier layer includes a plurality of parallax barriers and a wire grid polarizer disposed between the plurality of parallax barriers.

14. The display panel of claim 13, wherein an absorption axis of the parallax barrier is parallel to a reflection axis of the first polarizer.

15. A display device, comprising:

a display panel comprising;

a first substrate,

a second substrate facing the first substrate,

a liquid crystal layer disposed between the first substrate and the second substrate,

a first polarizer disposed on a lower surface of the first substrate and including a first polarizing layer and a second polarizing layer stacked on each other,

a second polarizer disposed on an upper surface of the second substrate, and

a viewing angle control layer disposed on the first polarizer, wherein the viewing angle control layer is configured to control a viewing angle of a column direction of the display panel; and

a backlight assembly configured to provide a light to the display panel.

16. The display apparatus of claim 15, wherein the viewing angle control layer is disposed on the upper surface of the second polarizer.

17. The display device of claim 15, wherein the viewing angle control layer is disposed between the first substrate and the first polarizer.

18. The display device of claim 15, wherein the viewing angle control layer comprises a viewing angle control film, and the viewing angle control film includes a base sheet and a protrusion portion protruding from an upper surface of the base sheet and extending in a direction.

19. The display device of claim 15, wherein the viewing angle control layer comprises a pattern retarder, and the pattern retarder includes a base layer having a birefringence, a pattern retarding layer disposed on a lower surface of the base layer and including patterns having a different optical axis from each other and an adhesive layer disposed on a lower surface of the pattern retarding layer.

20. The display device of claim 15, wherein the viewing angle control layer comprises a parallax barrier layer, and the parallax barrier layer includes a plurality of parallax barriers and a wire grid polarizer disposed between the plurality of parallax barriers.

21. The display device of claim 15, wherein an absorption axis of the second polarizer is perpendicular to an absorption axis of the first polarizer and wherein a reflection axis of the second polarizer is parallel to an absorption axis of the first polarizer.

22. The display device of claim 18, wherein the protrusion portion includes a light reflecting material and a light absorbing material.

23. The display device of claim 22, wherein the light reflecting material of the protrusion portion includes at least one selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, zinc phosphate, calcium carbonate, alumina, silica, antimony oxide, barium sulfide, lytopene (co-precipitate of barium sulfide and zinc oxide), calcined kaolin, lead carbonate, and magnesium oxide and wherein the light absorbing material of the protrusion portion includes at least one material selected from the group consisting of carbon black, spinel black, rutile black, and iron black.

24. The display device of claim 20, wherein the plurality of parallax barriers include at least one light reflecting material selected from the group consisting of titanium dioxide, zinc oxide, zinc sulfide, zinc phosphate, calcium carbonate, alumina, silica, antimony oxide, barium sulfide, lytopene (co-precipitate of barium sulfide and zinc oxide), calcined kaolin, lead carbonate, and magnesium oxide.

25. A display device, comprising:

a display panel comprising;

a first substrate,

a second substrate facing the first substrate,

a liquid crystal layer disposed between the first substrate and the second substrate,

a first polarizer disposed on a lower surface of the first substrate and including a first polarizing layer and a second polarizing layer stacked on each other,

a second polarizer disposed on an upper surface of the second substrate, and

a viewing angle control layer disposed on the first polarizer, wherein the viewing angle control layer is configured to control a viewing angle of a column direction of the display panel,

an optical sheet disposed on a lower surface of the first polarizer; and

a backlight assembly disposed on a lower surface of the optical sheet and configured to provide a light to the display panel.

26. The display device of claim 25, wherein the first polarizing layer includes a birefringence material and wherein the second polarizing layer includes a material having a reflective index different from the birefringence material of the first polarizing layer.

27. The display device of claim 25, wherein the second polarizing layer includes a macromolecular material having positive birefringence and wherein the first polarizing layer includes an isotropic macromolecular material.

28. The display device of claim 25, wherein the backlight assembly includes a light guide plate, a light source disposed at a side of the backlight assembly and configured to emit light to the light guide plate, and a reflection plate disposed on a lower surface of the light guide plate and configured to reflect the light emitted to the light guide plate.