LIQUID CRYSTAL PANEL, LIQUID CRYSTAL DISPLAY DEVICE, AND REFLECTIVE POLARIZING PLATE AND MANUFACTURING METHOD THEREOF

• US 20170115528A1
• Filed: 01/05/2017
• Published: 04/27/2017
• Est. Priority Date: 07/08/2014
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: OHMURO, Katsufumi, SAITOH, Yukito, YONEMOTO, Takashi
• Granted Patent: US 10,175,528 B2
• Time in Patent Office: Days
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02B 5/305 including organic materials, e.g. polymeric layers
• CPC Class Codes: G02F 1/133531 characterised by the arrangement of polariser or analyser axes
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 1/133562 on the viewer side
• CPC Class Codes: G02F 1/133567 on the back side
• CPC Class Codes: G02F 1/133614 using photoluminescence, e.g. phosphors illuminated by UV or blue light
• CPC Class Codes: G02F 1/133621 providing coloured light G02F1/133617, G02F1/133533 take precedence
• CPC Class Codes: G02F 2202/022 polymeric
• CPC Class Codes: G02F 2202/36 Micro- or nanomaterials

Abstract

An aspect of the present invention relates to a liquid crystal panel including a visible side polarizing plate, a liquid crystal cell, and a backlight side polarizing plate, in which the backlight side polarizing plate is a reflective polarizing plate of which a degree of polarization P_{550 nm} with respect to light at a wavelength of 550 nm is greater than or equal to 99.90%, and the reflective polarizing plate and the liquid crystal cell are integrally laminated, a liquid crystal display device, and a reflective polarizing plate and a manufacturing method thereof.

Claims

1. A liquid crystal panel, comprising:

a visible side polarizing plate;

a liquid crystal cell; and

a backlight side polarizing plate,

wherein the backlight side polarizing plate is a reflective polarizing plate of which a degree of polarization P_{550 nm} with respect to light at a wavelength of 550 nm is greater than or equal to 99.90%, and

the reflective polarizing plate and the liquid crystal cell are integrally laminated.

2. The liquid crystal panel according to claim 1,

wherein in the reflective polarizing plate, a degree of polarization P_{450 nm} with respect to light at a wavelength of 450 nm, a degree of polarization P_{550 nm} with respect to light at a wavelength of 550 nm, and a degree of polarization P_{630 nm} with respect to light at a wavelength of 630 nm satisfy at least one of Expression (1) or (2) described below.

0.00%≦

|P_{450 nm}−

P_{550 nm}|<

0.10% 

 

(1)

0.00%≦

|P_{550 nm}−

P_{630 nm}|<

0.10% 

 

(2)

3. The liquid crystal panel according to claim 2,

wherein the reflective polarizing plate satisfies Expression (1) and Expression (2) described above.

4. The liquid crystal panel according to claim 1,

wherein the liquid crystal cell and the reflective polarizing plate are integrally laminated through at least one easily adhesive layer.

5. The liquid crystal panel according to claim 1,

wherein the reflective polarizing plate includes a stretched film of a laminate of two or more layers selected from the group consisting of a polyethylene naphthalate film and a polyethylene terephthalate film as a reflective polarizer.

6. The liquid crystal panel according to claim 1,

wherein the visible side polarizing plate includes a polyvinyl alcohol-based film as a polarizer.

7. The liquid crystal panel according to claim 1,

wherein the visible side polarizing plate and the reflective polarizing plate are arranged such that transmission axes thereof are orthogonal to each other.

8. A liquid crystal display device, comprising:

the liquid crystal panel according to claim 1; and

a backlight unit.

9. The liquid crystal display device according to claim 8,

wherein the backlight unit emits at least blue light which has a light emission center wavelength in a wavelength range of 400 to 499 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm.

10. The liquid crystal display device according to claim 8,

wherein the backlight unit emits,

blue light which has a light emission center wavelength in a wavelength range of 400 to 499 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm,

green light which has a light emission center wavelength in a wavelength range of 500 to 599 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm, and

red light which has a light emission center wavelength in a wavelength range of 600 to 700 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm.

11. The liquid crystal display device according to claim 8,

wherein the backlight unit includes a wavelength conversion member containing a quantum dot which is excited by exciting light and emits fluorescent light.

12. The liquid crystal display device according to claim 11,

wherein the quantum dot contained in the wavelength conversion member is at east one type selected from the group consisting of

a quantum dot A having a light emission center wavelength in a wavelength range of 600 nm to 700 nm,

a quantum dot B having a light emission center wavelength in a wavelength range of 500 nm to 599 nm, and

a quantum dot C having a light emission center wavelength in a wavelength range of 400 nm to 499 nm.

13. The liquid crystal display device according to claim 12,

wherein the backlight unit includes a light source emitting blue light which has a light emission center wavelength in a wavelength range of 400 to 499 nm and has a light emission intensity peak having a half-width of less than or equal to 100 nm,

the wavelength conversion member contains the quantum dot A and the quantum dot B, and

the wavelength conversion member is disposed between the light source and the liquid crystal panel.

14. A reflective polarizing plate of which a degree of polarization P_{550 nm} with respect to light at a wavelength of 550 nm is greater than or equal to 99.90%.

15. The reflective polarizing plate according to claim 14,

wherein a degree of polarization P_{450 nm} with respect to light a wavelength of 450 nm, a degree of polarization P_{550 nm} with respect to light at a wavelength of 550 nm, and a degree of polarization P_{630 nm} with respect light at a wavelength of 630 nm satisfy at least one of Expression (1) or (2) described below.

0.00%≦

|P_{450 nm}−

P_{550 nm}|<

0.10% 

 

(1)

0.00%≦

|P_{550 nm}−

P_{630 nm}|<

0.10% 

 

(2)

16. The reflective polarizing plate according to claim 15, which satisfies Expression (1) and Expression (2) described above.

17. A manufacturing method of a reflective polarizing plate,

wherein the reflective polarizing plate is the reflective polarizing plate according to claim 14,

the reflective polarizing plate is a stretched film obtained by stretching a laminate of two or more layers of films,

the stretched film is prepared through a stretching step in at least film width direction, and

in the stretching step in the film width direction, the laminate of the two or more layers of films is sequentially subjected to a stretching treatment under a first heating treatment, a cooling treatment, and a second heating treatment.

18. The manufacturing method according to claim 17,

wherein the second heating treatment is performed at a heating temperature higher than or equal to a heating temperature of the first heating treatment.

19. The manufacturing method according to claim 17,

wherein the laminate is a laminate of two or more layers selected from the group consisting of a polyethylene naphthalate film and a polyethylene terephthalate film.