Final answer:
LCD (Liquid Crystal Display) technology requires backlighting. This is because the image on an LCD screen is created by a light from the back passing through colored filters. Plasma, DMD, and OLED generate their own light and do not require backlights.
Step-by-step explanation:
The display technology that requires backlighting is LCD (Liquid Crystal Display). In flat screen LCD televisions, a large light is generated at the back of the TV. This light then travels to the front screen through millions of tiny units called pixels, which have three cells with red, blue, or green filters. The voltage applied to each pixel's liquid crystal determines whether light gets passed through the filters to create various images on the screen. Therefore, the image on an LCD screen is created by manipulating this backlight passing through colored filters.
On the other hand, other technologies such as Plasma, DMD (Digital Micromirror Device), and OLED (Organic Light Emitting Diodes) produce their own light and do not require a backlight for visibility. Plasma screens work by illuminating small colored fluorescent lights. OLED displays create light with each pixel individually when electricity is applied, while DMD is a reflective technology used in projectors rather than direct-view displays.