In which display technology does each pixel emit its own light?

In OLED (Organic Light Emitting Diode) technology, each pixel is composed of organic compounds that emit their own light when an electric current passes through them. This characteristic allows for a high level of contrast and vivid colors, as the pixels can be turned on or off independently. This means that OLED displays can achieve true blacks because individual pixels can completely turn off, rather than relying on backlighting like in other technologies.

In contrast, LCD (Liquid Crystal Display) technology relies on a backlight and liquid crystals that control the passage of light, meaning that the pixels themselves do not emit light. Similarly, LED (Light Emitting Diode) technology, while often used in combination with LCDs for backlighting, also does not have pixels that emit their own light. CRT (Cathode Ray Tube) technology utilizes electron beams that illuminate phosphor dots on the screen, rather than the pixels emitting light directly.

Therefore, the correct answer is OLED, as it uniquely allows each pixel to function independently by emitting its own light.