Liquid crystal display device

A liquid crystal display device comprising:

• a liquid crystal panel;
• a backlight;
• an illuminance sensor that detects an environmental illuminance in a surrounding environment of the liquid crystal panel;
• and
• a display controller configured to increase a luminance of the backlight as the environmental illuminance detected by the illuminance sensor increases,
• the liquid crystal display device is a transmission liquid crystal display device,
• the liquid crystal panel including, in order toward the backlight, an antireflection layer, a first linearly polarizing plate, a first λ/4 retardation layer, a first substrate, a second λ/4 retardation layer, a liquid crystal layer, a second substrate, and a second linearly polarizing plate,
• an in-plane slow axis of the first λ/4 retardation layer and the transmission axis of the first linearly polarizing plate forming an angle of 42° to 48°,
• the liquid crystal panel having a reflectance of higher than 0.5% and 1.3% or lower in irradiating the liquid crystal panel with light from an antireflection layer side, and
• the liquid crystal display device satisfying 136.17X0.3891≤Y≤477.54X0.3086 with X≥10000, where X (unit:
• lx) is defined as the environmental illuminance detected by the illuminance sensor, and Y (unit:
• nit) is defined as the luminance of the backlight, adjusted by the display controller.

A liquid crystal display device comprising:

• a liquid crystal panel;
• a backlight;
• an illuminance sensor that detects an environmental illuminance in a surrounding environment of the liquid crystal panel;
• and
• a display controller that adjusts a luminance of the backlight, based on the environmental illuminance detected by the illuminance sensor,
• the liquid crystal panel including, in order toward the backlight, an antireflection layer, a first linearly polarizing plate, a first λ/4 retardation layer, a first substrate, a second λ/4 retardation layer, a liquid crystal layer, a second substrate, and a second linearly polarizing plate,
• the liquid crystal panel having a reflectance of higher than 1.3% and 1.8% or lower in irradiating the liquid crystal panel with light from an antireflection layer side, and
• the liquid crystal display device satisfying 172.05X0.3979≤Y≤640.09X0.3122 with X≥90, where X (unit:
• lx) is defined as the environmental illuminance detected by the illuminance sensor, and Y (unit:
• nit) is defined as the luminance of the backlight, adjusted by the display controller.