OPPO A78 — Screen Size, Resolution & PPI

What these specs mean

At phone viewing distance (around 15 cm / 6 inches), pixel density is the first thing you notice — above 300 PPI individual pixels disappear and text looks printed rather than pixelated. Refresh rate controls how smooth scrolling and games feel: 60 Hz is the long-standing baseline, 90–120 Hz noticeably cuts motion blur, and LTPO OLED panels can ramp from 1 Hz up to 120 Hz to save battery on static content. OLED's per-pixel contrast also makes blacks look genuinely black, which matters for dark-mode reading and overall battery behavior.

Modern OLED and AMOLED panels from suppliers like BOE, CSOT, and Samsung Display increasingly hit 120 Hz refresh, 1,000+ nit peak brightness, and full Dolby Vision HDR even on mid-range pricing — specs that cost flagship money only a few years ago now show up across price tiers.

Frequently asked questions

What is the pixel density of the OPPO A78?

The OPPO A78 has a 409 PPI pixel density on its 6.43-inch display — high enough that individual pixels are indistinguishable at typical viewing distance. Combined with the screen's OLED technology, this determines how sharp text and images actually render.

When was the OPPO A78 released?

OPPO launched the OPPO A78 in May 2023. Release date matters when checking software support windows: most manufacturers commit 5–7 years of security updates and 3–5 years of major OS upgrades from launch.

What operating system does the OPPO A78 run?

The OPPO A78 ships with Android. OPPO typically delivers OS updates over-the-air — check the device's Settings app or OPPO's support page for the latest available version.