Dear Friends today I talk
on best mobile technology that can be race on mobile Products. The latest Smartphones
have densities of up to 468 ppi. What does it mean? Should ppi important to buy
your next mobile?
A mobile
display has thousands of individual pixels. Pixel stands for picture elements.
They are basic structure of building of Smartphone. Images are structured by
standby the millions of pixel to change color in depth. Changing in pixel to
give the desired color, your mobile can produce any images.
There
are many factors to consider when comparing smartphone displays. A popular
point of contention has been the way pixels produce light. Organic LED
displays and LCD displays produce light in a different way. This leads to
differences in how the displays look – OLEDs have a higher contrast ratio
whereas LCDs give a brighter image. Other people will look at how
individual pixels are formed – the sub pixel arrangement can greatly
affect the readability of a display. Finally, there’s pixel density. This has
captured the most attention in the past year and it’s where we’ve seen the
biggest developments.
Simply put, pixel
density is a measure of how close together the pixels are packed on your Smartphone’s
display. The most popular way to measure pixel density is “pixels per inch”.
This is often abbreviated as ppi.
The following diagram
illustrates the meaning of “pixels per inch”. We’ve considered a hypothetical
display that measures 1-inch in each direction. Pixels are shown as a grey
square. Starting from the leftmost example, we have a display with just one
pixel. The one pixel takes up the entire display. In this example, there’s one
pixel for one inch of display. We say the display has a pixel density of 1ppi.
Moving rightwards to
the next image, the number of pixels has been doubled in both directions. The
pixel density has also doubled to 2ppi. The pattern continues as we move to
4ppi and 8ppi.
|
Pixel Density (Pixels
Per Inch/PPI)
|
Pixels Per Square Inch
|
|
1ppi
|
1
|
|
2ppi
|
4 (double ppi =
quadruple pixel count)
|
|
4ppi
|
16
|
|
8ppi
|
64
|
|
218ppi (Galaxy S II)
|
47,524
|
|
306ppi (Galaxy S III)
|
93,636
|
|
326ppi (iPhone 5 Retina
Display)
|
106,276
|
|
441ppi (Galaxy S4)
|
194,481
|
|
468ppi (HTC One)
|
219,024
|
“Pixels per square
inch” is a much better indicator of image quality. When pixel density doubles,
the “pixels per square inch” will quadruple. Compared to the iPhone 5 (326ppi),
the HTC One (468ppi) offers 43% more pixels per inch. However, the “pixels per
square inch” has actually increased by 106%. Picture quality has improved by
more than is expected.
How to Calculate Pixel
Density
To calculate the pixel
density of your smartphone, start by taking its resolution. You can look at the
resolution in either the horizontal or vertical directions. Once you have the
resolution, measure the length of the display. This should be recorded in
inches (2.54cm = 1 inch). By dividing the two numbers, you’ll end up with the
“pixels per inch” (ppi).
Here’s an example where
we’ve calculated the pixel density for the Galaxy S4:
No comments:
Post a Comment