Basic types of Smartphone Touchscreen Displays
Touch screens are widely used in ATM Machines, Retail Shop Terminals, Railways, Car, Transport and Radar Navigation Systems. These are basically made up of a touch panel with a responsive material. It works as electrical charge running through a wired matrix of a touch panel is shorted with human finger charge or stylus pressure. A controller senses the voltage change signal and sends to a Processor.

The first Capacitive touchscreen is developed by E.A. Johnson at Malvern, the UK in 1966. The first truly touch screen is developed by Sam Hurst and Elographics in 1977. The well known Siemens Company then financed the scientists for further development during this period. Then later on, after years companies such as HP (Hewlett-Packard) introduced touch screen based home computer. In recent 90's was the actual era where we started seeing these touch-devices in more applications worldwide with PDA's and Palms. In 2002 Microsoft first introduced first Windows tablet and in 2007, a fully Capacitive touchscreen phone were released by Apple is known as iPhone.

Basically, there are two types of touchscreen displays are widely available. Resistive and Capacitive type of touchscreen. They can further be categorized as follows.

TFT LCD Display

It is Thin Film Transistor technology developed far back in 19's and used in most of the earlier devices. TFT LCD displays lacks in viewing angles as well as poor visibility in an outdoor environment. TFT LCD Displays are widely used in TV sets, Computer Monitors, Video Gaming Devices, Mobiles, Navigation Systems and Projectors.

IPS LCD Display

IPS (In-Plane Switching) is the further enhancement to TFT LCD displays in which wider viewing angles are possible with lower power consumption. Due to this fact, they cost higher than TFT LCD displays and used in Hi-Tech gadgets.

Resistive Touch Display

Resistive displays work on the technology in which there are two conductive layers are combined with a small gap in between. This gap acts as a resistance. When pointer/stylus is pressed on this layer, two layers meet and complete a function and causing action as a button click. This click is then sensed by a processor and thereby causing an action on screen. Resistive touchscreen works on a pressure principle rather than just a touch.

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Capacitive Touch Display

This technology consists of a layer of glass on which there is a conductive layer is present. When this screen is touched by a human finger, the points present on the conductive layer complete the circuit and cause an action. Capacitive touchscreens are very sensitive to the human body conduction and hence there are widely used everywhere nowadays.


OLED (Organic Light Emitting Diode is a technology in which organic carbon-based layer is placed between two conductive sheets (Anode/Cathode) and cover by a top (seal) and bottom glass (substrate) plate. When an electric pulse is applied over two conductive plates, luminescent light is produced in the organic material. OLED displays are preferred over conventional LCDs due to an ability to produce excellent color combinations again with lightweight designs.

AMOLED Display

AMOLED (Active Matrix Organic Light Emitting Diode) are recently developed technology where OLED display uses further advanced light emitting diodes for causing accurate sensing action and enhanced color production. AMOLED displays have all the characteristics of OLED displays. These displays are quite costlier over conventional displays.

Super AMOLED Display

These are a further advanced version of AMOLED displays. Super Amoled Displays are under the patent of Samsung. A touch sensitive layer is combined over the AMOLED display which eliminates its separate presence over it. With this Samsung could bring the thinnest displays in the market at first. Samsung's latest series mobiles have Super Amoled Display.

Other types of Displays (Actually they are not separate display technology but are widely termed as types)

Retina Display

These are developed and named by Apple to consider the display in which pixels are not distinguished by human eyes. These are similar IPS LCD with backlit LED display used in their iPhone 4 series. Apple with brand name call them as "Retina Display"

Blackberry's Haptic-display is again famous due to the fact that while on touch the phone causes vibration/tactile response. These phones were developed for business people. 

The term Gorilla Glass is a special protective glass made up of alkali-aluminosilicate to protect the fragile display of the smartphone. This glass cover is hard and scratches proof enough to handle daily and long life rough usage.

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Resistive Touchscreen based Smartphones

Samsung Omnia Pro
Samsung Tacco Lite
HTC Tatto
Sony Ericsson Satio

Capacitive Touchscreen based Smartphones

Apple iPhones all Versions
Samsung Galaxy S Series

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