When comparing LCD and OLED screens used in smartphones and tablets, which statement correctly explains how OLED achieves deeper black levels than an LCD?
OLED displays rely on a cold-cathode fluorescent lamp (CCFL) and inverter to illuminate the screen.
OLED panels regulate a twisted-nematic liquid-crystal layer to control light from an LED backlight.
OLED pixels emit their own light, so they can be turned completely off instead of blocking a backlight.
OLED screens use a brighter LED backlight that produces higher contrast.
OLED (organic light-emitting diode) panels contain organic compounds that emit their own light when current is applied. Because each pixel can be completely shut off, the screen can display true black with no backlight bleed. LCD variants-including IPS, TN, and VA-require an external backlight and instead block or pass that light through liquid-crystal layers, so some light always leaks through, reducing contrast. Therefore, the self-emissive nature of OLED is what allows deeper blacks and higher contrast, while the distractor statements all describe characteristics of LCD technology.
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