Optical member and display device including the same
An optical member and a display device, the optical member including a light guide plate; a low refractive index layer disposed on a top surface of the light guide plate; a first optical pattern layer disposed on a bottom surface of the light guide plate; and a second optical pattern layer disposed to cover a light-incident surface of the light guide plate. The second optical pattern layer includes a focusing lens structure.
1. An optical member comprising:
a light guide plate having a first refractive index;
a low refractive index layer disposed on a top surface of the light guide plate and having a second refractive index;
a wavelength conversion layer disposed on a top surface of the low refractive index layer;
a first optical pattern layer disposed on a bottom surface of the light guide plate; and
a second optical pattern layer disposed to cover a light-incident surface of the light guide plate,
wherein:
the second refractive index is lower than the first refractive index; and
the second optical pattern layer comprises a focusing lens structure.
2. The optical member of claim 1 , wherein:
the second optical pattern layer comprises a base layer and a pattern layer disposed on the base layer and comprises the focusing lens structure; and
the pattern layer has a convex surface and a plurality of uneven patterns.
3. The optical member of claim 2 , wherein:
the convex surface is disposed to overlap with a center of the pattern layer; and
the uneven patterns are arranged in series at a constant pitch, starting from both edges of the convex surface.
4. The optical member of claim 3 , wherein the pattern layer comprises the convex surface and a Fresnel lens structure having the uneven patterns.
5. The optical member of claim 4 , wherein the Fresnel lens structure is a linear Fresnel lens structure.
6. The optical member of claim 5 , wherein:
the second optical pattern layer is disposed to further cover a first side of the wavelength conversion layer; and
the first side of the wavelength conversion layer is aligned with the light-incident surface.
7. The optical member of claim 6 , further comprising a tape layer covering a counter surface of the light guide plate that is opposite to the light-incident surface,
wherein the tape layer contains a light-reflecting material.
8. The optical member of claim 7 , wherein:
the tape layer is disposed to cover a second side of the wavelength conversion layer that is opposite to the first side of the wavelength conversion layer; and
the second side of the wavelength conversion layer is aligned with the counter surface.
9. The optical member of claim 8 , wherein the tape layer is disposed to cover all sides of the light guide plate except for the light-incident surface.
10. The optical member of claim 9 , wherein the second optical pattern layer and the tape layer are in contact with each other.
11. The optical member of claim 8 , wherein the second optical pattern layer comprises:
a first folded surface extending from one side of the light-incident surface to cover a top surface of the wavelength conversion layer; and
a second folded surface extending from the other side of the light-incident surface to cover a bottom surface of the first optical pattern layer.
12. The optical member of claim 11 , wherein the tape layer comprises:
a third folded surface extending from one side of the counter surface to cover a top surface of the wavelength conversion layer; and
a fourth folded surface extending from the other side of the counter surface to cover a bottom surface of the first optical pattern layer.
13. The optical member of claim 5 , wherein the second optical pattern layer is disposed to further cover a side of the first optical pattern layer.
14. The optical member of claim 4 , wherein the Fresnel lens structure is a circular Fresnel lens structure.
15. The optical member of claim 14 , wherein the second optical pattern layer comprises a Fresnel lens array having a plurality of circular Fresnel lens structures.
16. A display device comprising:
an optical member comprising:
a light guide plate having a first refractive index;
a low refractive index layer disposed on a top surface of the light guide plate and having a second refractive index;
a wavelength conversion layer disposed on a top surface of the low refractive layer;
a first optical pattern layer disposed on a bottom surface of the light guide plate; and
a second optical pattern layer disposed to cover a light-incident surface of the light guide plate;
a light source disposed on at least one side of the light guide plate; and
a display panel disposed above the optical member,
wherein:
the second optical pattern layer comprises a focusing lens structure; and
the second refractive index is lower than the first refractive index.
17. The display device of claim 16 , wherein:
the light source is configured to emit blue light; and
the wavelength conversion layer comprises:
first wavelength conversion particles converting the blue light into red light; and
second wavelength conversion particles converting the blue light into green light.
18. The display device of claim 17 , wherein the focusing lens structure is a linear Fresnel lens structure.
19. The display device of claim 18 , wherein:
the second optical pattern layer is disposed to further cover a first side of the wavelength conversion layer; and
the first side of the wavelength conversion layer is aligned with the light-incident surface.
20. The display device of claim 19 , further comprising a tape layer covering a counter surface of the light guide plate that is opposite to the light-incident surface,
wherein:
the tape layer comprises a light-reflecting material and is disposed to further cover a second side of the wavelength conversion layer that is opposite to the first side of the wavelength conversion layer; and
the second side of the wavelength conversion layer is aligned with the counter surface.