The invention provides a display device, belongs to the technical field of display devices and can solve problems of existing display devices. According to the display device, an optical grating structure is arranged between a display panel and a backlight module and comprises a first optical grating layer close to the backlight module and a second optical grating layer close to the liquid crystal display panel; the first optical grating layer is relatively short in period and is used for polarizing light, and after polarizing treatment, the second optical grating layer performs diffraction pointing on polarized light. The lighting effect is improved by the aid of the optical grating structure, crosstalk is reduced, the integration degree of a product can be increased, and light is efficiently utilized.