(සිංහලෙන් කියවන්න මෙතැනින්.)
You may know there are so many types of displays/screens with different technologies and pixel arrangements has been introduced for smart phones. Here is a brief description about smartphone displays.
In past we had dot matrix screens and later we had coloured displays. After that, people could use touchscreens instead of pressing hardware buttons. This was a revolution in display screens. Touchscreens are being developed and flexible screens have been introduced.
The quality of the smartphones display is one of the main characteristics you should take into consideration when you decide to buy an Android smartphone or tablet, and why? Read this and it may help you to decide. Most of the people don't want to know about inside of the screens and let's see what are the main things about display screens.
Most popular screen types.
TFT - (LCD)
SUPER LCD
IPS - (LCD)
Retina Display
OLED
AMOLED (Super AMOLED, Super AMOLED Plus...)
LCD (Liquid Crystal Display)
Most of you have heard about LCD screens. Because it replaced CRT monitors earlier. This technology is also used in smartphones. LCD displays start with a backlight that’s always on. It needs this backlight for produce all colours including black.
This technology is the one that used for other types of LCD displays like TN, TFT, IPS, S-IPS, and Super LCD.
TFT (Thin Film Transistor) LCD screens are the first improved version of the LCD technology. The main purpose to build this type of screens was to provide better contrast by better managing the pixels.
It offers better image quality and higher resolutions as compared to earlier generation LCD displays. But, narrow viewing angles and poor visibility in direct light or sunlight are limitations in these TFT screens. Also, large TFT displays consume more power and hence, are not battery-friendly. But this display technology is cheaper to manufacture, these are most commonly found on budget phones, feature phones and low-end smartphones.
IPS (In Plane Switching) is a premium LCD technology for having a wide viewing angle and clear and pure view picture. Also consumes less power compared to TFT screens. The main drawback of the IPS displays are not capable of accurately reproducing black, which looks rather like a dark shade of gray. This technology is found only in high-end smartphones.
Retina Display is also a type of LCD screens. Retina Display is a term used by Apple for its high resolution (640x960 pixels) IPS LCD display technology. The company calls it the Retina display because its pixels cannot be individually identified by a human eye, making the display super sharp, text more crisp and pictures more clear.
Super LCD is another improved version of the LCD displays. The Super LCD panels are highly appreciated for their low power consumption and accurate color reproduction. So the Super LCD2 and Super LCD3 displays have introduced to market.
OLED (Organic Light Emitting Diode)
The other major technology used for manufacturing various device displays is the OLED, which has a completely different functioning system. Because of the success in this technology, more OLED technologies have been introduced for smart phones and tabs.
OLED display technology is much better than LCD display technology because of its excellent colour reproduction (OLED screens doesn't need a backlight pannel, the pixels light up by them selves. That's why OLED screens have deep black colors, if there were a backlight panel light makes black color look bit more grey) , faster response times, wider viewing angles, higher brightness and extremely light weight designs. And also these screens LED pannels are very thin and consume low power. Therefore it's really helps to long last the battery.
AMOLED (Active-Matrix Organic Light Emitting Diode) display technology is a OLED-based technology.
The biggest problem of the AMOLED displays is that they are performing poorly under direct sunlight.
There is no substantial difference between OLED and AMOLED. Active Matrix, which is a method for controlling individual pixels.
Super AMOLED display technology is an advanced version AMOLED display developed by Samsung, the thinnest display technology in the market in 2014. Super AMOLED display is much more responsive than an AMOLED display.
Super AMOLED Plus and HD Super AMOLED are also developed by Samsung. They have differences in subpixels.
Pixels? What is it?
a pixel is a single point in a graphic image. It means a picture element. Every photograph, in digital form, is made up of pixels.
This example shows an image with a portion greatly enlarged, in which the individual pixels are rendered as small squares and can easily be seen.
What is ppi?
it's pixels per inch. A measurement of the pixel density.
Screen Resolutions.
QVGA - 240 x 320
WQVGA - 240 x 432
HVGA - 240 x 480
nHD - 360 x 640
WVGA - 480 x 800
FWVGA - 480 x 854
qHD - 540 x 960
DVGA - 640 x 960
XGA -768 x 1024
HD -720 x 1280 (720p)
WXGA -800 x 1280
FHD -1080 x 1920 (1080p) (Full HD)