Mobile phones have progressed dramatically since the days their displays needed only to show you the number of the person calling. Then text messaging was added and even email, we need a bit more space to see what we'd written. Then colors were to give them a bit more interest. When cameras were added to the phones, user wanted the screens to be sharper, so user could see the pixilated VGA photos taken. Once the ability to store video arrived, we needed them to be smooth, with good refresh rates.
In the era of touch screen smartphone, we expect them to be as good as computer screens, offering crisp text, vibrant images, blur-free video and enough brightness to see outdoors, all under a responsive touch layer.
Different type of mobile screens are:
1. TFT-LCD: By far the most common kind of screen used on mobile phones is TFT-LCD (often just referred to as LCD, since TFT-based LCD screens are the only type used in practice). It ranges from the budget smartphone like the HTC Wildfire to high-end handsets, such as the iPhone 4.There are many different ways of manufacturing LCD screens, so knowing that a phone is LCD doesn't tell you much about its quality.
In practice, cheap phone screens will often display dull colors, and have narrow viewing angles, which means that if you look at them from off-center, it becomes hard to see what's on-screen. High quality LCD screens will have bright, accurate colors and with visibility from just about any angle. All LCD screens need to have a light behind them, which shines through the pixels to make them visible. As a result, they don't offer quite the thinness of AMOLED technology.
2.Super-LCD: This is a particular type of TFT-LCD screen, and has been touted as rivalling AMOLED for image quality. It offers lower power consumption than most LCD technologies, but without sacrificing any picture quality.
3.NOVA: This is LCD-derived screen technology from LG. It's said to offer hugely increased brightness while being extremely energy efficient.
4.AMOLED: This is a screen technology based on organic compounds that offers high image quality in exchange for potentially very low power usage. Unlike LCD screens, AMOLED displays don't need a backlight - each pixel produces its own light - so phones using them can potentially be thinner. It also means that a mostly black screen will use very little electricity, and true blacks when watching videos, rather than the dark gray some LCD screens produce. However, AMOLED screens have proved costly and difficult to produce. AMOLED uses a different sub pixel arrangement to LCD, which can result in images that don't appear quite as sharp.
1.1.e Mobile Phone Keypads
Today, there are several types of mobile phones that address various requirements of users. In past few years lot of changes are seen in mobile phone handset, which include changes in keypads. Major types of cell phone keypads available are
A tactile keypad phone has a physical keypad; these phones are often referred as candy bar phones. In these phones keypad is numeric and alphabets can be typed by tapping the keys specific number of times. To make typing easier a feature T9 dictionary is added to most of the phones that saves you from lot of tapping. This is default keypad and mobile phones and mobile phones with this type of keypad are usually less costly.
1. Tactile Keypads:A tactile keypad phone has a physical keypad; these phones are often referred as candy bar phones. In these phones keypad is numeric and alphabets can be typed by tapping the keys specific number of times. To make typing easier a feature T9 dictionary is added to most of the phones that saves you from lot of tapping. This is default keypad and mobile phones and mobile phones with this type of keypad are usually less costly.
These keypads are very easy to repair or replace. Mobile phones with tactile keypads are best suited for people looking to buy a low budget phone. Here’s a look at a basic tactile keypad.
2. QWERTY Keypads: QWERTY is an acronym used to commonly describe standard keyboard layout on English-Language computers.QWERTY is derived from combining six keys (from left to right) on the far left portion of standard keyboard. These keys are just below the number keys. These keypads have different keys for all the alphabets. This type of keypad makes typing much easier and faster.Mobile phones with QWERTY keypads are very useful for the people who use their phone for Internet browsing and fast SMS texting or chatting. These keypads are easy to repair and replace. Here’s a look at QWERTY keypad