Patent ID: 11860480
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A liquid crystal display device comprising, in the following order:
a first polarizer;
a liquid crystal cell;
a second polarizer; and
a direct type backlight that uses a point light source,
wherein a light control member is further provided between the second polarizer and the direct type backlight,
the liquid crystal display device satisfies relationships of the following Expression (1) to Expression (3),

70%≤(I20/I0)×100≤90%  Expression (1)

10%≤(I40/I0)×100≤35%  Expression (2)

1%≤(I60/I0)×100≤20%  Expression (3)

in a case where, upon expressing an azimuthal angle with setting an absorption axis direction of the first polarizer to an azimuthal angle of 0°, counterclockwise rotation with reference to the absorption axis direction of the first polarizer as viewed from a viewing side is represented by a positive value,
I0 represents a brightness measured at a polar angle of 0° and an azimuthal angle of 0° in a state of the liquid crystal display device being brought into white display,
I20 represents an average brightness obtained by arithmetically averaging a brightness measured at a polar angle of 20° and an azimuthal angle of 45°, a brightness measured at a polar angle of 20° and an azimuthal angle of 135°, a brightness measured at a polar angle of 20° and an azimuthal angle of 225°, and a brightness measured at a polar angle of 20° and an azimuthal angle of 315°, in a state of the liquid crystal display device being brought into white display,
I40 represents an average brightness obtained by arithmetically averaging a brightness measured at a polar angle of 40° and an azimuthal angle of 45°, a brightness measured at a polar angle of 40° and an azimuthal angle of 135°, a brightness measured at a polar angle of 40° and an azimuthal angle of 225°, and a brightness measured at a polar angle of 40° and an azimuthal angle of 315°, in a state of the liquid crystal display device being brought into white display, and
I60 represents an average brightness obtained by arithmetically averaging a brightness measured at a polar angle of 60° and an azimuthal angle of 45°, a brightness measured at a polar angle of 60° and an azimuthal angle of 135°, a brightness measured at a polar angle of 60° and an azimuthal angle of 225°, and a brightness measured at a polar angle of 60° and an azimuthal angle of 315°, in a state of the liquid crystal display device being brought into white display.