Liquid crystal display device
A liquid crystal display being capable of improving the contrast ratio in the front direction thereof is provided. A liquid crystal display 100 of the present invention includes, in sequence: a light source device 14 that emits a parallel light beam; a back surface-side polarizer 16 ; a liquid crystal cell 13 ; a display surface-side polarizer 11 ; and a light diffusion layer 15 . The liquid crystal display 100 further includes: a selective light-shielding layer 12 between the display surface-side polarizer 11 and the light diffusion layer 15 so that the selective light-shielding layer 12 shields light that is generated by being depolarized and scattered in the liquid crystal cell 13 and travels in a direction that is different from a direction in which the parallel light beam travels.
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,
the light source has a half-value angle of the parallel light beam being 20° or less,
an absorption axis of the back surface-side polarizer is orthogonal to that of the display surface-side polarizer,
the selective light-shielding layer comprises light-shielding parts and light-transmitting parts, and the light-shielding parts and the light-transmitting parts are 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, and
the liquid crystal cell contains liquid crystal molecules aligned in a homeotropic alignment.
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 the 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 μm or less.
6. The liquid crystal display according to claim 1 , wherein
a thickness (X) of each of the light-shielding parts is greater than a width (Y) of each of the light-transmitting parts.
7. The liquid crystal display according to claim 6 , 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.