Matrix-type liquid crystal display device

• US 7,808,575 B2
• Filed: 04/09/2008
• Issued: 10/05/2010
• Est. Priority Date: 04/10/2007
• Status: Active Grant

• Current Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Original Assignee: Fujifilm Corporation (Fujifilm Holdings Corporation)
• Inventors: Watanabe, Jun, Hirakata, Junichi
• Primary Examiner(s): Ullah; Akm E
• Application Number:
  US12/100,226
• Publication Number:
  US 20080259246A1
• Time in Patent Office: 909 Days
• Field of Search: 349/64, 349/96, 349/179, 349/75, 349/193, 349/118, 349/119, 349/140, 349/141, 349/58
• US Class Current: 349/64
• CPC Class Codes: G02F 1/133507 Films for enhancing the luminance
• CPC Class Codes: G02F 1/133606 including a specially adapted diffusing, scattering or light controlling members
• CPC Class Codes: G02F 1/1393 the birefringence of the liquid crystal being electrically controlled, e.g. ECB-, DAP-, HAN-, PI-LC cells G02F1/1396, G02F1/141 take precedence

Abstract

A matrix-type liquid crystal display device, includes: a liquid crystal panel including: a pair of substrates disposed to face each other with at least one of the pair of substrates having an electrode; a liquid crystal layer interposed between the pair of substrates; a pair of polarizing plates disposed to sandwich the liquid crystal layer, each having a polarizing film and a protective film provided directly or indirectly on at least one surface of the polarizing film; and an optically compensatory film disposed in at least one of spaces between the liquid crystal layer and the pair of polarizing films; a backlight comprising a light source; a first optical member having a light-condensing property; and a second optical member having a surface scattering function.

Claims

1. A matrix-type liquid crystal display device, comprising:

a liquid crystal panel comprising;

a pair of substrates disposed to face each other with at least one of the pair of substrates having an electrode;

a liquid crystal layer interposed between the pair of substrates;

a pair of polarizing plates disposed to sandwich the liquid crystal layer, each having a polarizing film and a protective film provided directly or indirectly on at least one surface of the polarizing film; and

an optically compensatory film disposed in at least one of spaces between the liquid crystal layer and the pair of polarizing films;

a backlight comprising a light source;

a first optical member having a light-condensing property; and

a second optical member having a surface scattering function,

wherein the second optical member having a surface scattering function is a light-scattering film comprising;

a transparent support; and

at least a light-scattering layer directly or indirectly on the transparent support, and

wherein in the light-scattering film, assuming that when nearly parallel light rays are made incident on a surface of the light-scattering film at an incident angle of 5°

, a reflectance for an angle θ

in a light-receiving part measured in a plane containing a film normal line and an incident direction is R(θ

) and a value obtained by normalizing R(θ

) by a reflectance of regular reflection is Rrel(θ

) and further that a value calculated from the maximum variation |dRrel(θ

)/dθ

|max for the angle θ

is a scattering coefficient A (formula

     1), a reflection coefficient B (formula

     2) calculated from the scattering coefficient A and a 5°

specular reflectance Rs is from 1.5 to 4.5;

Scattering coefficient A =1/|dRrel(θ

)/dθ

|max 

 

(Formula

     1)

Reflection coefficient B =2.2×

log 10(Rs)−

7.5×

log 10(A)+5.9. 

 

(Formula

     2)

2. The matrix-type liquid crystal display device according to claim 1, wherein the first optical member having a light-condensing property collects light by a periodic concave-convex structure and a pitch of the periodic concave-convex structure is smaller than a periodicity pitch of display pixels.

3. The matrix-type liquid crystal display device according to claim 1, wherein the first optical member having a light-condensing property has a linear periodic concave-convex structure and a direction of the linear periodic concave-convex structure intersects a direction of pixel periodicity.

4. The matrix-type liquid crystal display device according to claim 1, wherein the second optical member having a surface scattering function is

disposed directly or indirectly on a surface of the protective film of the polarizing film on a backlight side.

5. The matrix-type liquid crystal display device according to claim 1, wherein the scattering coefficient A is from 1.5 to 4.5.

6. The matrix-type liquid crystal display device according to claim 1, which is in a vertically aligned display mode.

7. The matrix-type liquid crystal display device according to claim 1, wherein

the backlight, the first optical member having a light-condensing property, and the liquid crystal layer are arranged in this order;

and

one of the pair of polarizing plates is a polarizing plate on a viewing side, the polarizing plate on the viewing side having the second optical member having a surface scattering function formed thereon as a protective film at an outermost surface of the polarizing plate on the viewing side.