Patent ID: 9513503
Filing Date: 2016-12-06
CPC Classification: G02B,G02F

Claim Text:
1. A display apparatus, comprising: a liquid crystal display device, comprising: a backlight module; and a liquid crystal panel comprising a first substrate, a second substrate and a liquid crystal layer, wherein the liquid crystal layer is disposed between the first substrate and the second substrate and includes liquid crystal molecules, as no electrical field is applied in the liquid crystal layer, liquid crystal molecules are substantially perpendicular to surfaces of the first substrate and the second substrate, or the molecules have a pretilt angle substantially equal to or bigger than 60 degrees with the surfaces of the first substrate and the second substrate, as an electrical field is applied in the liquid crystal layer, the liquid crystal molecules are tilted into a liquid crystal tilt direction by the electrical field; a first polarizer disposed above the first substrate, wherein the first substrate is a color filter substrate; a second polarizer disposed between the second substrate and the backlight module, wherein a polarizing direction of the first polarizer is substantially perpendicular to a polarizing direction of the second polarizer; and a diffractive optical element including a first grating region having a first diffraction grating and a second grating region having a second diffraction grating and disposed on a light emitting side of the first polarizer, wherein an azimuth angle of the first diffraction grating is counted from an absorbing axis of the first polarizer as standard, wherein a period of the first grating region is 20 μm to 250 μm and a period of the second grating region is 20 μm to 250 μm; wherein the first grating region is separated from the second grating region by a non-grating region, and the non-grating region is designed for generating an intensity ratio of the total zero order diffraction light to the total non-zero order diffraction light higher than 100:1.