LIQUID CRYSTAL DISPLAY DEVICE

• US 20120008070A1
• Filed: 03/26/2010
• Published: 01/12/2012
• Est. Priority Date: 03/27/2009
• Status: Active Grant

• Current Assignee: Nitto Denko Corporation
• Original Assignee: Nitto Denko Corporation
• Inventors: Takemoto, Hiroyuki, Shuto, Shunsuke, Fuchida, Takehito
• Granted Patent: US 9,041,881 B2
• Time in Patent Office: Days
• US Class Current: 349/96
• CPC Class Codes: G02B 3/005 arranged along a single direction only, e.g. lenticular sheets G02B3/0043 takes precedence
• CPC Class Codes: G02B 5/003 Light absorbing elements
• CPC Class Codes: G02B 5/3033 in the form of a thin sheet or foil, e.g. Polaroid
• CPC Class Codes: G02F 1/133504 Diffusing, scattering, diffracting elements associated to illuminating devices G02F1/133606
• CPC Class Codes: G02F 1/133524 Light-guides, e.g. fibre-optic bundles, louvered or jalousie light-guides

Claims

1. A liquid crystal display comprising, in sequence:

a light source device that emits a parallel light beam;

a back surface-side polarizer;

a liquid crystal cell;

a display surface-side polarizer; and

a light diffusion layer,

wherein the liquid crystal display further comprises;

a selective light-shielding layer between the display surface-side polarizer and the light diffusion layer so that the selective light-shielding layer shields light that is generated by being depolarized and scattered in the liquid crystal cell and travels in a direction that is different from a direction in which the parallel light beam travels.

2. The liquid crystal display according to claim 1, wherein

a light-shielding angle of the selective light-shielding layer is in a range from 0.7 to 3.0 times a half-value angle of the parallel light beam emitted from the light source device.

3. The liquid crystal display according to claim 1, wherein

a light-shielding angle of the selective light-shielding layer is in a range from 1°

to 100°

.

4. The liquid crystal display according to claim 1, wherein

a diffusion half-value angle of the light diffusion layer is in a range from 10°

to 100°

.

5. The liquid crystal display according to claim 1, wherein

a surface roughness Ra of the light diffusion layer is 0.1 μ

m or less.

6. The liquid crystal display according to claim 1, wherein

an absorption axis of the back surface-side polarizer is orthogonal to that of the display surface-side polarizer.

7. The liquid crystal display according to claim 1, wherein

the selective light-shielding layer comprises:

light-shielding parts; and

light-transmitting parts,

the light-shielding parts and the light-transmitting parts being arranged in stripes so that a direction orthogonal to a width direction of the stripes becomes parallel to an absorption axis of the display surface-side polarizer.

8. The liquid crystal display according to claim 7, wherein

a thickness (X) of each of the light-shielding parts is greater than a width (Y) of each of the light-transmitting parts.

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

the thickness (X) of each of the light-shielding parts is 1.5 times or more the width (Y) of each of the light-transmitting parts.

10. The liquid crystal display according to claim 1, wherein

the liquid crystal cell contains liquid crystal molecules aligned in a homeotropic alignment.