Backlight — What It Is and Why It Matters
A backlight is the illumination system behind or around a dive computer's display that makes the screen readable in low-visibility conditions — night dives, deep dives, wreck penetrations, or murky water. Modern dive computers use LED backlighting, which is brighter and more energy-efficient than older electroluminescent (EL) systems.
Full-color AMOLED and TFT screens found on premium dive computers are self-illuminating and always readable without a separate backlight. Budget models typically use monochrome LCD screens with a manually or automatically activated backlight.
Frequently Asked Questions
Does using the backlight drain the battery faster?
Yes. On monochrome LCD dive computers, frequent or always-on backlight use significantly reduces battery life. AMOLED displays consume more power overall but do not have a separate backlight toggle — the screen is always lit.
Can I set the backlight to stay on for an entire dive?
Many dive computers allow this in their settings, but it dramatically reduces battery life on LCD models. For frequent night diving, consider a computer with an AMOLED or TFT display designed for always-on readability.
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