Display Screen of Mobile Phone

A basic phone or feature phone has a small display and keypad for interaction with the phone.

Smartphones has a touch screen glass, which uses the finger touch pressure as input through special sensing method (capacitive or resistive) and is converted into an input signal. This way touch screen acts as an input device. New mobile phones covers the most part of the phone’s front surface as touch screen.

In Smartphone, the keypad comes inside the touchscreen, as a virtual display keyboard in Mobile OS, thereby reducing the space and need of keypad hardware.

Display screen or the touch screen is the medium by which a user interacts with the phone. This also determines the size of the phone. It is also an output device.

screen size is based on the diagonal measurement of 4 to 6 inches. (4” to 6”)

There are two types of touch screen displays – Capacitive and Resistive.

Both the displays are based on TFT technology. TFT stands for Thin Film Transistor technology.

CAPACITIVE touch screens work by sensing the electrical properties of the human body while RESISTIVE touch screens operate by sensing direct pressure applied by the user.

TFT LCDs are the most common type of display units used in mobile phones. LCD stands for Liquid Crystal Display.

TFT LCD offer better image quality and higher resolutions compared to earlier generation LCD displays but their limitation lies in narrow viewing angles and poor visibility in direct light or sunlight.

Large TFT displays consume more power and hence are not battery friendly. But since these are cheaper to manufacture these are found on budget phones, feature phones and lower end smartphone.

IPS LCDs are superior to normal TFT LCD displays with wider viewing angles and lower power consumption which leads to a much improved battery life.
IPS stands for In-Place Switching. IPS-LCDs are costlier than normal TFT LCD and hence are found only on higher end smartphones. A higher resolution (640 x 960 pixels) version of IPS LCD is used in Apple iPhone 4 and is called Retina Display because of its brilliant picture quality.

Resistive touch screens contain two layer of conductive material with a very small gap between them which acts as a resistance. When the resistive touch screen is touched with finger (or stylus) the two layers meet at the point of touch thus making a circuit at the point of touch. This information is recognized by the mobile’s processor / chip and passed on to the mobile’s OS there by triggering and event / action at the point of touch.

Resistive Touch screens are not as responsive as capacitive touch screens and often require a stylus to identify point of touch accurately. These are used only in lower end smartphones and feature touch phones.

Capacitive touch screen technology consists of a layer of glass coated with a transparent conductor (like indium tin oxide). When a capacitive touch screen is touched by human body (finger), an interruption is created in the screens electrostatic field (which is measurable as a change in capacitance) which is detected by phone’s processor or chip and which in turn instructs phone’s operating system to trigger and event or action accordingly.

Capacitive touch screens are much better and responsive to human touch when compared to resistive touch screens. Capacitive Touch screens are used in most of the higher end smartphones.

OLED - OLED stands for Organic Light Emitting Diode. It is a newer technology for displays of mobiles and monitors. In OLED technology a layer of organic material (carbon based) is sandwiched between two conducting sheets (an anode and a cathode), which in turn are sandwiched between a glass top plate (seal) and a glass bottom plate (substrate). When electric pulse is applied the two conducting sheets, electro-luminescent light is produced directly from the organic material sandwiched between sheets. Brightness and color can vary depending on the electric pulse.

OLEDs are much better compared to LCDs because of their exceptional color reproduction, blazing fast response times, wider viewing angles, higher brightness and extremely light weight designs. OLEDs panels are very thin and consume low power. Therefore it is really helps to long last the battery.
AMOLED - AMOLED stands for Active-Matrix Organic Light-Emitting Diode.

AMOLED displays are a type of OLED displays for mobiles and are rapidly gaining popularity in top end smartphone segment. AMOLED screens have all the attributes of an OLED display like brilliant color reproduction, light weight, better battery life, higher brightness and sharpness and light weight designs.

AMOLED displays are now getting into market and most of the latest higher end smartphones comes with AMOLED displays.It is recommended to choose AMOLEDs over TFT LCDs.

Super AMOLED displays are the advanced version of AMOLED displays developed by Samsung. Super AMOLED display is built with touch sensors on the display itself, as opposed to creating a separate touch sensitive layer (as in capacitive touch screen). This is the thinnest display technology.

Super AMOLED displays are also much more responsive than other AMOLED displays.

Retina Display

Retina Display is a term used by Apple for its high resolution (640 x 960 pixels) IPS LCD (with backlit LED) used by them in iPhone4. They call it the Retina display because its pixels cannot be individually identified by the human eye, thus making the display super sharp and brilliant.

Haptic / Tactile touch screen : Haptic technology has been used by Blackberry and Nokia for their touch screen smartphones targeted towards enterprise market.

This technology provides a tactile feedback on a touch action on the screen thus providing an immediate and unmistakable confirmation to the user. Haptic technology has been found to significantly improve user performance, accuracy and satisfaction while typing on a touch screen.

Gorilla Glass

Gorilla Glass is a special glass shield with exceptional damage resistance that helps protect mobile displays from scratches, drops, and bumps of everyday use.

Many companies like Motorola, Samsung and Nokia are now using Gorilla Glass to make their mobile displays more durable and reliable.

It is always better to go for a smartphone with Gorilla Glass for that added protection and peace of mind.

in all mobile phones, generally the screen size will be given in inches. In some countries it is measured in centimetres. It is normally calculated in diagonal measurement. Normally a smartphone comes with 4 to 6 inch display. A little bigger screen is also available in market, but if the screen size exceeds 6.5 to 7 inches, it's normally called as a tab / pad / mini book / mini pad. The basic architecture in tab is same that of mobile phone, differing slightly in display, operating system and even some apps.

The resolution of the Display, contributes to the quality of the phone. Higher the pixels, higher is the resolution.

The Display resolution is usually quoted as width × height, with the units in pixels: for example, "1024 × 768" means the width is 1024 pixels and the height is 768 pixels.

1080p (1920×1080 px also known as Full HD or FHD ) is a set of HDTV high-definition video modes characterized by 1080 horizontal lines of vertical resolution; the p stands for progressive scan, i.e. non-interlaced. The term usually assumes a widescreen aspect ratio of 16:9, implying a resolution of 2.1 megapixels. It is often marketed as full HD, to contrast 1080p with 720p resolution screens. HD means High Definition.


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