Liquid crystal display device appreciating room

• US 7,889,283 B2
• Filed: 04/05/2007
• Issued: 02/15/2011
• Est. Priority Date: 05/26/2006
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Yoshimi, Hiroyuki, Kitagawa, Takeharu
• Primary Examiner(s): Nelms; David
• Assistant Examiner(s): Briggs; Nathanael R
• Application Number:
  US12/063,903
• Publication Number:
  US 20090201435A1
• Time in Patent Office: 1,412 Days
• Field of Search: 349/1, 349/61, 349/98
• US Class Current: 349/1
• CPC Class Codes: G02F 1/13363 Birefringent elements, e.g. for optical compensation
• CPC Class Codes: G02F 1/133638 Waveplates, i.e. plates with a retardation value of lambda/n
• CPC Class Codes: G02F 2413/02 Number of plates being 2
• CPC Class Codes: G02F 2413/08 with a particular optical axis orientation
• CPC Class Codes: G02F 2413/12 Biaxial compensators

Abstract

Provided is a liquid crystal display device appreciating room making it possible to prevent glare or external-image-projection on the basis of external light so that persons can watch the screen of a liquid crystal display device satisfactorily. The appreciating room comprises a room, a liquid crystal display device arranged inside the room and having a liquid crystal panel 2, and a light source which lightens the inside of the room, wherein a ¼ wavelength plate 6 is arranged on the front surface side of a viewing-side polarizer 3 of the liquid crystal panel 2, the ¼ wavelength plate 6 is arranged to set the angle θ of the slow axis direction X thereof to 45±5° or 135±5° from the absorptive axis direction A of the viewing-side polarizer toward the counterclockwise direction when the ¼ wavelength plate is seen from the viewing-side, and light inside the room is any one of left-handed circularly polarized light and right-handed circularly polarized light.

Claims

1. A liquid crystal display device appreciating room, comprising:

a room,

a liquid crystal display device arranged inside the room and having a liquid crystal panel, and

a light source which lightens the inside of the room,

wherein said light source includes a light bulb and an optical member,

wherein said optical member circularly polarizes the light emitted from the light bulb,

wherein a ¼

wavelength plate is arranged on the front surface side of a viewing-side polarizer of the liquid crystal panel,

the ¼

wavelength plate is arranged to set the angle of the slow axis direction thereof to 45±

5°

or 135±

5°

from the absorptive axis direction of the viewing-side polarizer toward the counterclockwise direction when the ¼

wavelength plate is seen from the viewing-side, and

light inside the room essentially consists of left-handed circularly polarized light or right-handed circularly polarized light.

2. The liquid crystal display device appreciating room according to claim 1, wherein the front surface of the ¼

wavelength plate has fine irregularities.

3. The liquid crystal display device appreciating room according to claim 1, wherein the ¼

wavelength plate has an optical characteristic of converting circularly polarized light at a wavelength of 550 nm to linearly polarized light.

4. The liquid crystal display device appreciating room according to claim 1, wherein the light source transmits any one of left-handed circularly polarized light and right-handed circularly polarized light.

5. The liquid crystal display device appreciating room according to claim 1, further comprising:

a second light source,

a second optical member,

wherein the second light source corresponds to natural light outside the room which enter the inside of the room from an opening in the room, wherein

said second optical member, which transmits any one of left-handed circularly polarized light and right-handed circularly polarized light out of natural light outside the room, is arranged in an opening in the room.

6. The liquid crystal display device appreciating room according to claim 1, wherein the optical member has a film exhibiting a cholesteric phase.

7. The liquid crystal display device appreciating room according to claim 1, wherein the room is a room in a building.

8. The liquid crystal display device appreciating room according to claim 1, wherein the room is a room in a vehicle.