Liquid crystal lens and 3D display
View Patent ↗The disclosure provides a liquid crystal lens, including an upper substrate, a lower substrate, a liquid crystal layer and a spacer, the liquid crystal layer and the spacer are disposed between the upper substrate and the lower substrate. A surface of the spacer is coated with a first antireflection film and a second antireflection film in turn. An index of refraction of the liquid crystal layer is n 0 . An index of refraction of the first antireflection film is n 2 , a thickness of which is d2. An index of refraction of the second antireflection film is n 1 , a thickness of the second antireflection film is d1. An index of refraction of the spacer is n 3 , and n 1 = n 0 2 3 n 3 1 3 , n 2 = n 0 1 3 n 3 2 3 , n 1 d1=n 2 d2=λ/6, where λ is a wavelength of light. The liquid crystal lens and the 3D display can reduce light intensity of the reflective rays on the spacer and increase contrast of the image.
1. A liquid crystal lens, comprising: an upper substrate, a lower substrate, a liquid crystal layer and a spacer, the liquid crystal layer and the spacer disposed between the upper substrate and the lower substrate, wherein a surface of the spacer is coated with a first antireflection film and a second antireflection film in turn, an index of refraction of the liquid crystal layer is n 0 , an index of refraction of the first antireflection film is n 2 , a thickness of the first antireflection film is d2, an index of refraction of the second antireflection film is n 1 , a thickness of the second antireflection film is d1, an index of refraction of the spacer is n 3 , and
n
1
=
n
0
2
3
n
3
1
3
,
n
2
=
n
0
1
3
n
3
2
3
,
n
1
d
1
=
n
2
d
2
=
λ
/
6
,
where λ is a wavelength of light.
2. The liquid crystal lens according to claim 1 , wherein the index of refraction n 2 of the first antireflection film is larger than the index of refraction n 1 of the second antireflection film.
3. The liquid crystal lens according to claim 1 , wherein the spacer is spherical.
4. The liquid crystal lens according to claim 3 , wherein a diameter of the spacer is 20 um˜50 um.
5. The liquid crystal lens according to claim 1 , wherein reflectivity of the first antireflection film and that of the second antireflection film are directly proportional to a size of the spacer.
6. The liquid crystal lens according to claim 1 , wherein reflectivity of the first antireflection film and that of the second antireflection film are 10%-40%.
7. The liquid crystal lens according to claim 1 , wherein the first antireflection film and the second antireflection film are made by one or more materials selected from a group consisting of SiO 2 , SiN 4 , MgF 2 , TiO 2 , ZrO 2 , Nb 2 O 5 , material of the first antireflection film and that of the second antireflection film are different.
8. A 3D display, comprising a liquid crystal lens, the liquid crystal lens comprising: an upper substrate, a lower substrate, a liquid crystal layer and a spacer, the liquid crystal layer and the spacer disposed between the upper substrate and the lower substrate, wherein a surface of the spacer is coated with a first antireflection film and a second antireflection film in turn, an index of refraction of the liquid crystal layer is n 0 , an index of refraction of the first antireflection film is n 2 , a thickness of the first antireflection film is d2, an index of refraction of the second antireflection film is n 1 , a thickness of the second antireflection film is d1, an index of refraction of the spacer is n 3 ,
n
1
=
n
0
2
3
n
3
1
3
,
n
2
=
n
0
1
3
n
3
2
3
,
n
1
d
1
=
n
2
d
2
=
λ
/
6
,
where λ is a wavelength of light.
9. The 3D display according to claim 8 , wherein the spacer is spherical.
10. The 3D display according to claim 8 , wherein the index of refraction n 2 of the first antireflection film is larger than the index of refraction n 1 of the second antireflection film.