Light diffusing film, polarizing plate, liquid crystal display device and production method of light diffusing film

A liquid crystal display device, comprising:

• a liquid crystal display element, and
• a backlight structure for irradiating the liquid crystal display element,
• wherein the backlight structure includes at least two prism sheets having a large number of fine prism grooves on the liquid crystal display element-side surface,
• the angle between the groove direction of the prism groove of the two prism sheets and the repeating direction of pixels in the liquid crystal element is 4 to 86°,
• the two prism sheets are disposed by arranging the groove directions of prism grooves to run at right angles to one another, and
• a light diffusing film is provided between said two prism sheets and the liquid crystal element, the light diffusing film comprising a thermoplastic resin as the main component and containing, in the thermoplastic resin, at least one kind of a light-transmitting particle having an average primary particle diameter of 3 to 10 μm,
• wherein the absolute value of the refractive index difference between the thermoplastic resin and the light-transmitting particle is from 0.01 to 0.06,
• one surface has a concavoconvex shape, the total haze value is from 15 to 30%, the internal haze value is from 5 to 25%, the surface haze value is from 5 to 20%, and the average film thickness is from 20 to 200 μm.