1.19 Inch 390x390 Round AMOLED Display Module MIPI SPI - VXO-119AMA-044

No Backlight — What That Actually Removes

A TFT LCD is a shutter, not a lamp. It needs a light behind it, and supplying that light is a real chunk of the hardware. An AMOLED does not.

The smallest TFT backlight in our range is 0.18 W, and the largest is 2.34 W. This module draws about 0.098 W in total at full white — the worst case for an AMOLED — which is still below the smallest TFT backlight on its own.

And full white is genuinely the worst case. On an LCD, a dark screen costs the same as a bright one because the backlight is always on. On an AMOLED, a dark pixel draws little, so a watch face with a black background costs far less than the full-white figure.

60,000:1 — and Why It Is Not a Typo

The mechanism is straightforward once you accept there is no backlight. On an LCD, a "black" pixel is a shutter trying to block a lamp that is still on, so some light always gets through. On an AMOLED, a black pixel is emitting nothing. The ratio is measured as white luminance over black luminance, and when the denominator approaches zero, the ratio becomes very large.

What this means in practice: text and graphics on black are crisp in a way an LCD cannot match, and the panel looks correct in a dark room rather than showing a grey glow. For a watch face with a black background — the common case — that is the whole visual experience.

Where It Gets Used

• Smart watches — the stated application: round, dense, low standby current.
• Fitness bands and trackers — 1 µA deep standby between workouts.
• Wearable medical devices — worn continuously, read at any angle.Compact round instruments and gauges — true black for dial-style readouts.
• Bluetooth and IoT devices with a small screen — wake on event, show, return to standby.
• Battery products that must last weeks — no backlight, and power follows content.
• Products where thickness matters — 0.678 mm total glass, no backlight unit.

GENERAL INFORMATION

Item	Contents	Unit
Model	VXO-119AMA-044
Display Mode	AMOLED	/
LTPS Glass Outline (W×H)	33.22×33.75	mm
Encapsulation Glass Outline (W×H)	33.22×32.75	mm
Active area (W×H)	φ30.42	mm
Number ofDots	390×3(RGB)×390	/
Diagonal Inch	1.2	inch
Pixel pitch (W×H)	78×78	um
Glass Thickness	0.2(LTPS) 0.205(Encap) 0.678(Total)	mm

ABSOLUTE MAXIMUM RATINGS

Parameter	Symbol	Min	Max	Unit
Supply voltage (Display)	VCC	-0.3	5.5	V
	IOVCC	-0.3	5.5	V
	ELVDD	0.0	6.0	V
	ELVSS	-6.5	0.0	V
Operating temperature	Top	-20	70	0C
Storage temperature	TST	-30	80	OC
Humidity	RH		90	%RH

EXTERNAL DIMENSIONS