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The two screen types you will see mentioned most often on phones are LCD and OLED, and the difference is simpler than the jargon suggests. An LCD uses a backlight that shines through a layer of liquid crystals and colour filters. An OLED has no separate backlight, because each tiny pixel produces its own light. That one distinction explains most of what people notice when they compare two handsets side by side. Knowing which you have also helps you make sense of a repair qu