Transparent liquid crystal display device and display method thereof

A transparent liquid crystal display device, comprising:

• a transparent liquid crystal display panel, including a color filter substrate;
• a transparent backlight module, disposed on a non-display side of the transparent liquid crystal display panel and including:
• a transparent light guide plate;
• and
• an ultraviolet light source, disposed on a side end of the transparent light guide plate,
• a cholesteric liquid crystal cell, disposed on a side of the transparent backlight module opposite to the transparent liquid crystal display panel, wherein a screw pitch of a cholesteric liquid crystal molecule in the cholesteric liquid crystal cell and a wavelength of ultraviolet light emitted from the ultraviolet light source are in a linear relationship,
• wherein the color filter substrate includes color resin layers with different colors, and the color resin layers with the different colors are mixed with fluorescent materials which are excitable to emit corresponding colors, and
• wherein the cholesteric liquid crystal cell is configured to reflect circularly polarized ultraviolet light having an identical rotation direction with the cholesteric liquid crystal molecule in the ultraviolet light emitted from the ultraviolet light source to the color resin layers, to excite the fluorescent materials to emit light, so as to assist the transparent liquid crystal display device to display under a condition that an intensity of ambient light is lower than a preset value.