A display device is disclosed, which it comprises a backlight module used for providing the backlight brightness of the display device; a display device used for displaying images; a first polarizer, located between the backlight module and the display module, and disposed on a lower surface of the display module, for transforming light from the backlight module into linear polarizing light; a mirror polarizer having polarization function, comprising a first thermosensitive glue layer, the mirror polarizer is bonded on an outer surface of the display module by a first thermosensitive glue layer for transmitting light from the backlight module and reflecting natural light at the same time. The display device of the present invention does not obviously increase the display panel thickness and weight, and has relatively lower cost. Also, it can be used in the LCD module and OLED display module.