A display device (10, 20, 30), comprising: a first display panel, being a liquid crystal display panel, and configured for regionalized brightness adjustment and comprising: a plurality of first pixel units (140, 140A, 140B), each comprising a first sub-pixel (142, 142A, 142B) and a second sub-pixel (144, 144A, 144B), wherein the first sub-pixel (142, 142A, 142B) and the second sub-pixel (144, 144A, 144B) are configured to be switched together by being connected to a common active component connected to a single scan line and a single data line; a second display panel, being a liquid crystal display panel, and disposed above the first display panel and comprising a plurality of second pixel units (240, 240A), wherein each second pixel unit (240, 240A) comprises a third sub-pixel, a fourth sub-pixel, and a fifth sub-pixel, wherein each of the third sub-pixel, the fourth sub-pixel, and the fifth sub-pixel comprises a driving layer (242A, 244A, 246A) and a color filter layer (242B, 244B, 246B), each driving layer including a respective sub-pixel electrode; and a backlight module (300A, 300B), wherein the first display panel is located between the second display panel and the backlight module (300A, 300B), wherein each first pixel unit (140, 140A, 140B) is disposed corresponding to N second pixel units (240, 240A), where N is an integer satisfying 0 <N≦20; and each first pixel unit (140, 140A, 140B) further comprises a first sub-pixel electrode in the first sub-pixel (142, 142A, 142B), a second sub-pixel electrode in the first sub-pixel (144, 144A, 144B), a common line and a common electrode, wherein the common electrode is overlapped with both sub-pixel electrodes (PE1, PE2), and the common electrode and the common line are electrically connected to each other through a contact hole. a first display panel, being a liquid crystal display panel, and configured for regionalized brightness adjustment and comprising: a plurality of first pixel units (140, 140A, 140B), each comprising a first sub-pixel (142, 142A, 142B) and a second sub-pixel (144, 144A, 144B), wherein the first sub-pixel (142, 142A, 142B) and the second sub-pixel (144, 144A, 144B) are configured to be switched together by being connected to a common active component connected to a single scan line and a single data line; a second display panel, being a liquid crystal display panel, and disposed above the first display panel and comprising a plurality of second pixel units (240, 240A), wherein each second pixel unit (240, 240A) comprises a third sub-pixel, a fourth sub-pixel, and a fifth sub-pixel, wherein each of the third sub-pixel, the fourth sub-pixel, and the fifth sub-pixel comprises a driving layer (242A, 244A, 246A) and a color filter layer (242B, 244B, 246B), each driving layer including a respective sub-pixel electrode; and a backlight module (300A, 300B), wherein the first display panel is located between the second display panel and the backlight module (300A, 300B), wherein each first pixel unit (140, 140A, 140B) is disposed corresponding to N second pixel units (240, 240A), where N is an integer satisfying 0 <N≦20; and each first pixel unit (140, 140A, 140B) further comprises a first sub-pixel electrode in the first sub-pixel (142, 142A, 142B), a second sub-pixel electrode in the first sub-pixel (144, 144A, 144B), a common line and a common electrode, wherein the common electrode is overlapped with both sub-pixel electrodes (PE1, PE2), and the common electrode and the common line are electrically connected to each other through a contact hole.