Interference filter, display device, and display device manufacturing method

• US 9,268,074 B2
• Filed: 09/10/2013
• Issued: 02/23/2016
• Est. Priority Date: 09/11/2012
• Status: Active Grant

• Current Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Nagato, Hitoshi, Miyazaki, Takashi, Suzuki, Kouji, Atsuta, Masaki, Hasegawa, Rei
• Primary Examiner(s): Won, Bumsuk
• Assistant Examiner(s): Gagnon, Grant
• Application Number:
  US14/022,686
• Publication Number:
  US 20140071534A1
• Time in Patent Office: 896 Days
• Field of Search: 359580-590, 359/577, 359/578, 359/579, 359/260, 359/261, 356/454, 356/505, 356/506, 356/519, 353/20
• US Class Current: 1/1
• CPC Class Codes: G02B 5/284 of etalon type comprising a resonant cavity other than a thin solid film, e.g. gas, air, solid plates etalons for fibre optic multiplexing G02B6/29358; etalons for spectral measurement G01J3/26
• CPC Class Codes: G02F 1/133514 Colour filters
• CPC Class Codes: G02F 1/133521 Interference filters
• CPC Class Codes: G02F 1/136222 Colour filters incorporated in the active matrix substrate

Abstract

According to one embodiment, a display device includes an interference filter including following layers, and a display layer. The first common layer includes first and second regions. The second common layer faces the first common layer. The first spacer layer is provided between the first and second common layers and includes first and second portions facing the first and second regions. The thickness of the first portion is different from the thickness of the second portion. The second spacer layer faces at least one of the first and second portions through the second common layer and is made of the same material as that of the first spacer layer. The coating layer faces the second common layer through the second spacer layer.

Claims

1. A display device, comprising:

an interference filter comprising;

a first common layer comprising a first region, a second region, and a third region;

a second common layer facing the first common layer;

a first spacer layer provided between the first common layer and the second common layer and comprising a first portion facing the first region, a second portion facing the second region, and a third portion facing the third region, the first portion having a first thickness, the second portion having a second thickness different from the first thickness, the third portion having a third thickness different from the first thickness and the second thickness;

a second spacer layer comprising a fourth portion facing the first portion through the second common layer, a fifth portion facing the second portion through the second common layer, and a sixth portion facing the third portion through the second common layer, the second spacer layer being made of a same material as a material of the first spacer layer;

a coating layer comprising a seventh portion facing the fourth portion, an eighth portion facing the fifth portion, and a ninth portion facing the sixth portion; and

a display layer facing the interference filter,

wherein;

each of the first common layer, the first spacer layer, the second common layer, the second spacer layer, and the coating layer is formed from a dielectric film; and

one or two of the following conditions is satisfied;

a total thickness of the fourth portion and the seventh portion is zero;

a total thickness of the fifth portion and the eighth portion is zero; and

a total thickness of the sixth portion and the ninth portion is zero.

2. The device according to claim 1, wherein the second common layer is continuously provided to face the first portion, the second portion, and the third portion.

3. The device according to claim 1, wherein the first thickness is greater than the second thickness.

4. The device according to claim 1, wherein the first thickness is greater than the third thickness.

5. The device according to claim 1, wherein:

the interference filter comprises a first interference filter portion including the first region of the first common layer, a second interference filter portion including the second region of the first common layer, and a third interference filter portion including the third region of the first common layer;

the first interference filter portion is configured to transmit light in a first wavelength region and to reflect light in a wavelength region other than the first wavelength;

the second interference filter portion is configured to transmit light in a second wavelength region different from the first wavelength region and to reflect light in a wavelength region other than the second wavelength region; and

the third interference filter portion is configured to transmit light in a third wavelength region different from the first wavelength region and the second wavelength region and to reflect light in a wavelength region other than the third wavelength region.

6. The device according to claim 1, wherein a portion where one of

the total thickness of the fourth portion and the seventh portion,

the total thickness of the fifth portion and the eighth portion, and

the total thickness of the sixth portion and the ninth portion,

is not zero, transmits green light.

7. The device according to claim 1, further comprising an absorption filter facing the interference filter through the display layer.

8. The device according to claim 1, wherein the display layer is a liquid crystal layer.

9. An interference filter, comprising:

a first common layer comprising a first region, a second region, and a third region;

a second common layer facing the first common layer;

a first spacer layer provided between the first common layer and the second common layer and comprising a first portion facing the first region, a second portion facing the second region, and a third portion facing the third region, the first portion having a first thickness, the second portion having a second thickness different from the first thickness, the third portion having a third thickness different from the first thickness and the second thickness;

a second spacer layer comprising a fourth portion facing the first portion through the second common layer, a fifth portion facing the second portion through the second common layer, and a sixth portion facing the third portion through the second common layer, the second spacer layer being made of a same material as a material of the first spacer layer; and

a coating layer comprising a seventh portion facing the fourth portion, an eighth portion facing the fifth portion, and a ninth portion facing the sixth portion,

wherein;

each of the first common layer, the first spacer layer, the second common layer, the second spacer layer, and the coating layer is formed from a dielectric film; and

one or two of the following conditions is satisfied;

a total thickness of the fourth portion and the seventh portion is zero;

a total thickness of the fifth portion and the eighth portion is zero; and

a total thickness of the sixth portion and the ninth portion is zero.

10. The interference filter according to claim 9, wherein the second common layer is continuously provided to face the first portion, the second portion, and the third portion.

11. The interference filter according to claim 9, wherein the first thickness is greater than the second thickness.

12. The interference filter according to claim 9, wherein the first thickness is greater than the third thickness.

13. The interference filter according to claim 9, comprising a first interference filter portion including the first region of the first common layer, a second interference filter portion including the second region of the first common layer, and a third interference filter portion including the third region of the first common layer,

wherein:

the first interference filter portion is configured to transmit light in a first wavelength region and to reflect light in a wavelength region other than the first wavelength;

the second interference filter portion is configured to transmit light in a second wavelength region different from the first wavelength region and to reflect light in a wavelength region other than the second wavelength region; and

the third interference filter portion is configured to transmit light in a third wavelength region different from the first wavelength region and the second wavelength region and to reflect light in a wavelength region other than the third wavelength region.

14. The interference filter according to claim 9, wherein a portion where one of

the total thickness of the fourth portion and the seventh portion,

the total thickness of the fifth portion and the eighth portion, and

the total thickness of the sixth portion and the ninth portion,

is not zero, transmits green light.

15. A display device manufacturing method, comprising:

forming an interference filter, the interference filter comprising;

a first common layer comprising a first region, a second region, and a third region;

a second common layer facing the first common layer;

a first spacer layer provided between the first common layer and the second common layer and comprising a first portion facing the first region, a second portion facing the second region, and a third portion facing the third region, the first portion having a first thickness, the second portion having a second thickness different from the first thickness, the third portion having a third thickness different from the first thickness and the second thickness;

a second spacer layer comprising a fourth portion facing the first portion through the second common layer, a fifth portion facing the second portion through the second common layer, and a sixth portion facing the third portion through the second common layer, the second spacer layer being made of a same material as a material of the first spacer layer; and

a coating layer comprising a seventh portion facing the fourth portion, an eighth portion facing the fifth portion, and a ninth portion facing the sixth portion,

wherein;

each of the first common layer, the first spacer layer, the second common layer, the second spacer layer, and the coating layer is formed from a dielectric film; and

one or two of the following conditions is satisfied;

a total thickness of the fourth portion and the seventh portion is zero;

a total thickness of the fifth portion and the eighth portion is zero; and

a total thickness of the sixth portion and the ninth portion is zero; and

forming a display layer facing the interference filter.