The listing promises a 6.7-inch screen, 120 Hz and 1,000 nits. Three flattering numbers that can describe a mediocre panel or an excellent one. The diagonal says nothing about sharpness, the refresh rate says nothing about colour, and the advertised brightness often means a peak reached on a small area.
Reading a screen means checking four things: actual resolution, pixel density, panel type and sustained brightness.
The diagonal is not usable size
A 6.7-inch screen is measured diagonally. The figure says nothing about real area or aspect ratio. Two devices with the same diagonal can have different proportions, and therefore different usable width.
It says nothing about sharpness either. A 6.7-inch 720p panel and a 6.7-inch 1.5K panel share the diagonal and have nothing in common in image quality.
Resolution and ppi
Resolution is expressed in pixels: 720 by 1600, 1080 by 2400, or 1220 by 2712. Retail listings use labels such as HD+, FHD+ or 1.5K, which hide substantial gaps.
Density, in pixels per inch, expresses real sharpness. Below 300 ppi text loses finesse. Above 400 the eye struggles to tell the difference at normal distance.
720p on 6.7 inches works out around 260 ppi. That is the weak point of many budget models: the panel can be bright and smooth, and text still looks soft.
Nits
A nit measures brightness. Listings often quote a peak, reached on a small portion of the screen for a few seconds.
The useful figure is sustained brightness, what remains available in everyday use. A screen advertised at 1,200 nits may cap at 600 under the sun, which changes readability completely.
In Algeria, summer and direct light make this decisive. A panel at 400 sustained nits becomes hard to read outdoors, even with good contrast.
OLED and LCD
An OLED panel lights each pixel separately. Blacks are deep, contrast is high, and power draw falls on dark images.
An LCD panel uses a single backlight. Blacks stay greyish, especially in a dark room, but maximum brightness is often easier to achieve.
OLED can produce low-frequency flicker that some people notice. LCD does not, though its contrast remains lower.
120 Hz
A 120 Hz refresh rate redraws the image twice as fast as 60 Hz. Scrolling feels smoother and animations look cleaner.
The benefit depends on use. Reading and video are fine at 60. Gaming and fast navigation gain real comfort at 120.
Beware models advertising 120 Hz on a budget LCD panel: the rate is there, image quality stays average.
Marketing labels
"1.5K AMOLED" guarantees neither brightness, nor colour accuracy, nor tough protective glass.
"Adaptive 120 Hz" means the rate drops to save battery. That is good, provided the range is genuinely used.
"1,000 nits" without qualification usually means a peak measured on 5% of the panel.
Test in a shop
Raise brightness to maximum and look at the screen facing a shop window. If it stays readable, the panel keeps its promise.
Open a page of small text and look at letter edges. Blur is obvious on 720p.
Scroll a long page. Smoothness is easier to judge than in a demo animation.
The short version
The diagonal attracts, resolution informs, density decides sharpness. Sustained brightness matters more than the quoted peak, and panel type sets contrast.
Before buying, check exact resolution and density in ppi. A 120 Hz 720p screen is still a soft screen.
Read next
- Best phone between 50,000 and 100,000 DA
- Compare phones in Algeria
- The Mobilidz price comparison tool
