Display apparatus

Patent metadata

Field	Value
Publication number	US-11243342-B2
Application number	US-201916591196-A
Country	US
Kind code	B2
Filing date	Oct 2, 2019
Priority date	Oct 15, 2018
Publication date	Feb 8, 2022
Grant date	Feb 8, 2022

Abstract

Disclosed herein is a display apparatus. The display apparatus includes a backlight unit configured to emit light, a display panel positioned in front of the backlight unit; and an optical film positioned in front of the display panel, and the optical film includes a base layer, a first refractive layer positioned in front of the base layer, a second refractive layer positioned in front of the first refractive layer and having a lower refractive index than the first refractive layer, a third refractive layer positioned at the rear of the base layer, and a fourth refractive layer positioned at the rear of the third refractive layer and having a lower refractive index than the third refractive layer.

First claim

What is claimed is:

1. A display apparatus, comprising:
a backlight unit configured to emit light;
a display panel positioned to the front of the backlight unit; and
an optical film positioned to the front of the display panel, the optical film including:
a base layer,
a first refractive layer positioned to the front of the base layer, the first refractive layer comprising:
first patterns, each including a first non-perpendicular portion and a first parallel portion which extends in a first direction perpendicular to a front to rear direction of the optical film, and
second parallel portions, each disposed between adjacent first patterns among the first patterns, wherein each second parallel portion extends in the first direction and is connected to a first parallel portion of one of the adjacent first patterns by a first non-perpendicular portion of the one of the adjacent first patterns,

a second refractive layer positioned to the front of the first refractive layer and having a higher refractive index than air and a lower refractive index than the first refractive layer, the second refractive layer comprising a first filling portion filling between the first patterns,
a third refractive layer positioned to the rear of the base layer, the third refractive layer comprising second patterns, and
a fourth refractive layer positioned to the rear of the third refractive layer and having a lower refractive index than the third refractive layer,
wherein
the second patterns each include a second non-perpendicular portion configured to refract at least a portion of the light emitted from the backlight unit that passes through the fourth refractive layer, and
a distance between the adjacent first patterns, corresponding to a length of a corresponding second parallel portion among the second parallel portions, is different from a distance between adjacent second patterns among the second patterns.

2. The display apparatus of claim 1 , wherein
the first non-perpendicular portion of each of the first patterns is configured to totally reflect a portion of the light emitted from the backlight unit.

3. The display apparatus of claim 1 , wherein
the first non-perpendicular portion has a greater inclination angle than the second non-perpendicular portion.

4. The display apparatus of claim 1 , wherein
each of the first patterns has a higher height than each of the second patterns.

5. The display apparatus of claim 1 , wherein
the fourth refractive layer comprises a second filling portion filling between the second patterns of the third refractive layer.

6. The display apparatus of claim 1 , wherein
the first patterns and the second patterns are embossed patterns.

7. The display apparatus of claim 2 , wherein
each of the second patterns includes a third parallel portion which extends in the first direction, and
the third refractive layer comprises fourth parallel portions, each disposed between the adjacent second patterns, wherein each fourth parallel portion extends in the first direction and is connected to a third parallel portion of one of the adjacent second patterns by a second non-perpendicular portion of the one of the adjacent second patterns.

8. The display apparatus of claim 1 , wherein
the first non-perpendicular portion includes a curved portion configured to totally reflect a portion of the light emitted from the backlight unit.

9. The display apparatus of claim 1 , wherein
the second patterns include a curved portion.

10. The display apparatus of claim 9 , wherein
each of the second patterns of the third refractive layer is an engraved pattern.

11. A display apparatus, comprising:
a display panel; and
an optical film positioned to the front of the display panel, the optical film including:
a base layer,
a first refractive layer positioned to the front of the base layer, the first refractive layer comprising:
first patterns each comprising a first non-perpendicular portion configured to totally reflect a portion of light passing through the base layer and a first parallel portion which extends in a first direction perpendicular to a front to rear direction of the optical film, and
second parallel portions, each disposed between adjacent first patterns among the first patterns, wherein each second parallel portion extends in the first direction and is connected to a first parallel portion of one of the adjacent first patterns by a first non-perpendicular portion of the one of the adjacent first patterns,

a second refractive layer positioned to the front of the first refractive layer and having a higher refractive index than air and a lower refractive index than the first refractive layer, the second refractive layer comprising a first filling portion filling between the first patterns,
a third refractive layer positioned to the rear of the base layer, the third refractive layer comprising second patterns each comprising a second non-perpendicular portion configured to refract a portion of light incident from the display panel, and
a fourth refractive layer positioned to the rear of the third refractive layer and having a lower refractive index than the third refractive layer,

wherein a distance between the adjacent first patterns, corresponding to a length of a corresponding second parallel portion among the second parallel portions, is different from a distance between adjacent second patterns among the second patterns.

12. The display apparatus of claim 11 , wherein
the first patterns are embossed patterns.

13. The display apparatus of claim 11 , wherein
the second patterns are embossed patterns or engraved patterns, and
the fourth refractive layer comprises a second filling portion filling between the second patterns.

14. The display apparatus of claim 11 , wherein
the first non-perpendicular portion has a greater inclination angle than the second non-perpendicular portion.

15. The display apparatus of claim 11 , wherein
each of the first patterns has a higher height than each of the second patterns.

16. A display apparatus, comprising:
a display panel;
a backlight unit configured to supply light to the display panel and provided such that a ratio of light emitted in a front and rear direction is greater than a ratio of light emitted in an oblique direction in the front and rear direction; and
an optical film positioned to the front of the display panel, the optical film including:
a base layer,
a first refractive layer positioned to the front of the base layer, the first refractive layer comprising:
first patterns, each comprising a first non-perpendicular portion configured to totally reflect a portion of light passing through the base layer and formed in an embossed pattern, and a first parallel portion which extends in a first direction perpendicular to a front to rear direction of the optical film, and
second parallel portions, each disposed between adjacent first patterns among the first patterns, wherein each second parallel portion extends in the first direction and is connected to a first parallel portion of one of the adjacent first patterns by a first non-perpendicular portion of the one of the adjacent first patterns,

a second refractive layer positioned to the front of the first refractive layer and having a higher refractive index than air and a lower refractive index than the first refractive layer, the second refractive layer comprising a first filling portion filling between the first patterns,
a third refractive layer positioned to the rear of the base layer, the third refractive layer comprising secon

Assignees

• Samsung Electronics Co Ltd

Inventors

• Jeong seung jun
• Kang Sei Young
• Kang Min Woo
• Roh Nam Seok
• Min Kwan Sik
• Choi Jun Sung

Classifications

• G02F1/133553

  Reflecting elements (associated to illuminating devices G02F1/133605) · CPC title

• G02B5/0231

  the surface having microprismatic or micropyramidal shape (macroscopic prism arrays G02B5/045) · CPC title

• G02B5/0263

  with positional variation of the diffusing properties, e.g. gradient or patterned diffuser · CPC title

• G02B6/0051

  Diffusing sheet or layer · CPC title

• G02B6/0053 Primary

  Prismatic sheet or layer; Brightness enhancement element, sheet or layer · CPC title