The embodiment of the invention provides a liquid-
crystal display device, and relates to the technical field of liquid-
crystal display. By the adoption of the liquid-
crystal display device, the resolution and illumination of display are not reduced when
transparent display is achieved. A backlight module includes a
luminescence part and a
light guide plate; after entering the
light guide plate ina certain angle range, light transmitted by the
luminescence part is totally reflected; a display panel includes a first substrate, a second substrate and a
liquid crystal layer; the second substrateis close to the backlight module; the first substrate includes colorful light resistance patterns and light shading patterns, wherein the light shading patterns are used for partitioning the colorfullight resistance patterns and enabling polarized light in a first polarization direction to transmit; the liquid-
crystal display device further includes first gratings which are arranged at the side,close to or away from the display panel, of the
light guide plate, and the orthographic projections of the first gratings on the light shading patterns are located within the borders of the light shading patterns; the first gratings are used for enabling light which is totally reflected in the light guide plate to be emergent as collimated polarized light, the polarization direction of the collimated polarized light serves as a second polarization direction, and the first polarization direction is perpendicular to the second polarization direction.