Patent ID: 8830421

Claim:
A display device including a sub-backlight unit, comprising: a front display unit, the front display unit including a display panel; and a rear display unit disposed at a rear side of the front display unit to allow an image of the rear display unit to be visible through a portion of the front display unit; a first light guide panel disposed at a rear side of the display panel and having a transparent window through which the rear display unit is visible; a first light source disposed around the first light guide panel; a front backlight unit having a reflective sheet disposed at a rear surface of the first light guide panel to reflect light and having an image hole formed corresponding to the transparent window; and a sub-backlight unit disposed at a location corresponding to the transparent window on a rear side of the front backlight unit, wherein the sub-backlight unit includes: a second light guide panel having an opening corresponding to the transparent window, a second light source disposed at a circumference of the light guide panel, and a polymer dispersed liquid crystal (PDLC) sheet disposed close to a front side of the opening of the second light guide panel.