Ultrathin light unit

Patent metadata

Field	Value
Publication number	US-10114167-B2
Application number	US-201514932456-A
Country	US
Kind code	B2
Filing date	Nov 4, 2015
Priority date	Nov 19, 2014
Publication date	Oct 30, 2018
Grant date	Oct 30, 2018

Abstract

Provided is a thin light unit for a display device that includes, for example, a high refraction film including an inclined portion at a first side of the high refraction film and a flat portion extended from the inclined portion to a second side of the high refraction film; a second member on the inclined portion at the first side of the high refraction film and having a first width; a first member on the flat portion in a middle of the second side of the high refraction film and separated from the second member; a third member on the flat portion and having the first width; and a light source adjacent to the first member at a side of the flat portion.

First claim

What is claimed is:

1. A display device having a display panel and a light unit, the light unit comprising:
a high refraction film including an inclined portion at a first side of the high refraction film and a flat portion extended from the inclined portion to a second side of the high refraction film;
a second member on the inclined portion at the first side of the high refraction film and having a first width;
a first member on the flat portion in a middle of the second side of the high refraction film and separated from the second member;
a third member on the flat portion and having the first width; and
a light source adjacent to the first member at a side of the flat portion,
wherein the first member absorbs a transmitted light having an incident angle less than a critical angle, which makes a total reflection occur at an interface between the high refraction film and the third member, among incident light emitted from the light source and being incident on the side of the flat portion.

2. The display device of claim 1 , wherein the first member is disposed on the third member.

3. The display device of claim 1 , wherein the third member is disposed between the second member and the first member.

4. The display device of claim 3 , wherein the inclined portion has an inclined angle for adjusting a reflection angle of a divergent light, which has an incident angle greater than the critical angle among the incident light and travels inside the high refraction film through the total reflection, so that the divergent light has an incident angle less than the critical angle and is incident on the second member.

5. The display device of claim 4 , wherein the second member has a holographic pattern for converting the divergent light, which is collimated in a vertical direction by the inclined portion and is incident on the second member, into a collimated light collimated in vertical and horizontal directions, and emitting the collimated light having a predetermined condition, and
wherein the predetermined condition is a condition, in which the collimated light, which is emitted to the inclined portion and is again reflected by adjusting an angle due to the inclined portion, is transmitted by the high refraction film and is totally reflected at an interface between the third member and an air.

6. The display device of claim 5 , wherein the third member has a holographic pattern for emitting a portion of the collimated light again reflected by the inclined portion to the outside of the third member.

7. A display device having a display panel and a light unit, the light unit comprising:
a high refraction film including an inclined portion at a first side of the high refraction film and a flat portion extended from the inclined portion to a second side of the high refraction film;
a second member on the inclined portion at the first side of the high refraction film and having a first width;
a first member on the flat portion in a middle of the second side of the high refraction film and separated from the second member;
a third member on the flat portion and having the first width;
a light source adjacent to the first member at a side of the flat portion; and
a low refraction film opposite an upper surface of the high refraction film,
wherein the first member absorbs a transmitted light having an incident angle less than a critical angle, which makes a total reflection occur at an interface between the high refraction film and the low refraction film, among incident light emitted from the light source and being incident on the side of the flat portion.

8. The display device of claim 7 , wherein the inclined portion has an inclined angle for adjusting a reflection angle of a divergent light, which has an incident angle greater than the critical angle among the incident light and travels inside the high refraction film through the total reflection, so that the divergent light has an incident angle less than the critical angle and is incident on the second member.

9. The display device of claim 8 , wherein the second member has a holographic pattern for converting the divergent light, which is collimated in a vertical direction by the inclined portion and is incident on the second member, into a collimated light collimated in vertical and horizontal directions, and emitting the collimated light having a predetermined condition, and
wherein the predetermined condition is a condition, in which the collimated light, which is emitted to the inclined portion and is again reflected by adjusting an angle due to the inclined portion, is transmitted by the high refraction film and the low refraction film and is totally reflected at an interface between the third member and an air.

10. The display device of claim 9 , wherein the third member has a holographic pattern for emitting a portion of the collimated light again reflected by the inclined portion to the outside of the third member.

11. The display device of claim 1 , further comprising a lower first member disposed under the high refraction film and positioned opposite the first member.

12. The display device of claim 7 , further comprising a lower first member disposed under the high refraction film and positioned opposite the first member.

13. The display device of claim 1 , further comprising:
a light scattering mode light source disposed on both sides of the light source in a width direction at the side of the flat portion;
a lower low refraction film disposed on a lower surface of the high refraction film; and
a fourth member positioned opposite the flat portion on a lower surface of the lower low refraction film.

14. The display device of claim 7 , further comprising:
a light scattering mode light source disposed on both sides of the light source in a width direction at the side of the flat portion;
a lower low refraction film disposed on a lower surface of the high refraction film; and
a fourth member positioned opposite the flat portion on a lower surface of the lower low refraction film.

15. The display device of claim 13 , further comprising a reflective film disposed under the fourth member.

16. The display device of claim 14 , further comprising a reflective film disposed under the fourth member.

17. A light unit for a display device comprising:
a high refraction film including an inclined portion at a first side of the high refraction film and a flat portion extended from the inclined portion to a second side of the high refraction film;
a second member on the inclined portion at the first side of the high refraction film and having a first width;
a first member on the flat portion in a middle of the second side of the high refraction film and separated from the second member;
a third member on the flat portion and having the first width; and
a light source adjacent to the first member at a side of the flat portion,
wherein the first member absorbs a transmitted light having an incident angle less than a critical angle, which makes a total reflection occur at an interface between the high refraction film and the third member, among incident light emitted from the light source and being incident on the side of the flat portion.

Assignees

• Lg Display Co Ltd
• Covestro Deutschland Ag

Inventors

• Bang Hyungseok
• Ryu Seungman

Classifications

• G02B6/0046

  Tapered light guide, e.g. wedge-shaped light guide · CPC title

• G02B5/32 Primary

  Holograms used as optical elements · CPC title

• G02F1/133615

  Edge-illuminating devices, i.e. illuminating from the side · CPC title

• G02F2201/08

  light absorbing layer · CPC title

• G02B6/0065

  Manufacturing aspects; Material aspects · CPC title