If you thought TVs couldn't get any thinner, think again. LG Display's "wallpaper" panel is 55 inches wide, but less than a millimeter (four-hundredths of an inch) thick. It's so thin and light (just over 4 pounds) that it can be attached to the wall with a simple magnetic backing and then peeled off like a sticker.

This level of thickness is only attainable with OLEDs, or organic light-emitting diodes. While LCD TVs require a stack of backlights, filters and tiny shutters to create their pixels, OLED TVs put all those into one layer. OLED display has enabled thin phones and other devices, but OLED TVs have been few and far between, partly because it is difficult to manufacture large numbers of them — making them astronomically expensive.

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