Nokia Lumina 900

Nokia Lumia 900 is a Windows Phone-powered smartphone, first unveiled on January 9, 2012 by Nokia at Consumer Electronics Show 2012, where it won the Best Smartphone award in January 2012. The phone has 4G LTE support and was released in April, 2012. Nokia Lumia 900 has a 4.3″ (109 mm) display and a ClearBlack AMOLED 800×480 capacitive touchscreen. It also features a one-piece polycarbonate body and is available in magenta, black, cyan and white.

DROIDE RAZR

The Motorola Droid Razr (GSM/UMTS version: Motorola Razr; both versions styled RAZR) is an Android-based, 4G LTE-capable smartphone designed by Motorola that launched on Verizon Wireless on November 11, 2011. It was announced on 18 October 2011 in New York City.

At launch, the RAZR was the thinnest smartphone in the world at only 7.1 mm thick on most of the device (it does, however, have a "bump" on top that's approximately 11.1 mm thick.) and includes a 4.3-inch (110 mm) super active-matrix organic light emitting diode (AMOLED) advanced PenTile display, covered in a Gorilla glass screen and a kevlar back plate. It is powered by an OMAP 4430 SoC with dual 1.2 GHz ARM Cortex-A9 processor cores. Its 8 megapixel rear facing camera can record 1080p HD videos. It comes with 1 GB of RAM and runs Android version 4.0.4

AMOLED Categories

Super AMOLED
Super AMOLED is Samsung's term for an AMOLED display with an integrated digitizer, meaning, the layer that detects touch is integrated into the screen, rather than being overlaid on top of it. According to Samsung, Super AMOLED reflects 5 times less sunlight compared to the first generation AMOLED. The display technology itself is not changed. Also, Super AMOLED displays uses a PenTile RGBG subpixel arrangement that has fewer subpixels than a traditional RGB RGB subpixel arrangement.


Super AMOLED Advanced
Super AMOLED Advanced is a term marketed by Motorola to describe a brighter display than Super AMOLED screens, but also a higher resolution – qHD or 960 × 540 for Super AMOLED Advanced compared to WVGA or 800 × 480 for Super AMOLED. This display equips the Motorola Droid RAZR.

Super AMOLED Plus

Super AMOLED Plus, first introduced with the Samsung Galaxy S II and Samsung Droid Charge smartphones, is a branding from Samsung where the PenTile RGBG pixel matrix (2 subpixels) used in Super AMOLED displays has been replaced with a traditional RGB RGB (3 subpixels) arrangement typically used in LCD displays. This variant of AMOLED is brighter and therefore more energy efficient than Super AMOLED displays and produces a sharper, less grainy image because of the increased number of subpixels. In comparison to AMOLED and Super AMOLED displays, the Super AMOLED Plus displays are even more energy efficient and brighter.

HD Super AMOLED

HD Super AMOLED is a branding from Samsung for an HD-resolution (>1280×720) Super AMOLED display. The first device to use it was the Samsung Galaxy Note. the Galaxy Note and the Galaxy S III both implements the HD Super AMOLED with a PenTile RGBG-matrix (2 subpixels/pexel) , while the Galaxy Note II uses an RBG matrix (3 subpixels/pixels) but not in the standard 3 stripe arrangement.

Source : Wikipedia

AMOLED Compare with Other Technologies

AMOLED displays provide higher refresh rates than their passive-matrix OLED counterparts[not specific enough to verify], improving response time often to under a millisecond, and they consume significantly less power. This advantage makes active-matrix OLEDs well suited for portable electronics, where power consumption is critical to battery life.

The amount of power the display consumes varies significantly depending on the colour and brightness shown. As an example, one commercial QVGA OLED display consumes 3 watts while showing black text on a white background, but only 0.7 watts showing white text on a black background. Because the black pixels actually turn off, AMOLED also has contrast ratios that are significantly better than LCD.

AMOLED displays may be difficult to view in direct sunlight compared with LCDs because of their reduced maximum brightness. Samsung's Super AMOLED technology addresses this issue by reducing the size of gaps between layers of the screen. Additionally, PenTile technology is often used to allow for a higher resolution display while requiring fewer subpixels than would otherwise be needed, often resulting in a display less sharp and more grainy compared with a non-pentile display with the same resolution.

The organic materials used in AMOLED displays are prone to degradation over a period of time. However, technology has been developed to compensate for material degradation.

Current demand for AMOLED screens is high, and, due to supply shortages of the Samsung-produced displays, certain models of HTC smartphones have been changed to use next-generation LCD displays from the Samsung and Sony joint-venture SLCD in the future. Construction of new production facilities in 2011 will increase the production of AMOLED screens to cope with demand.

Source : Wikipedia

AMOLED Future Development

   Manufacturers have developed in-cell touch panels, integrating the production of capacitive sensor arrays in the AMOLED module fabrication process. In-cell sensor AMOLED fabricators include AU Optronics and Samsung. Samsung has marketed their version of this technology as Super AMOLED. Researchers at DuPont used computational fluid dynamics (CFD) software to optimize coating processes for a new solution-coated AMOLED display technology that is cost and performance competitive with existing chemical vapor deposition (CVD) technology. Using custom modeling and analytical approaches, they developed short- and long-range film-thickness control and uniformity that is commercially viable at large glass sizes.

Source : Wikipedia

AMOLED - ACTIVE MATRIX ORGANIC LIGHT-EMITTING DIODE

ACTIVE MATRIX ORGANIC LIGHT-EMITTING DIODE

AMOLED is a display technology for use in mobile devices and televisions. OLED describes a specific type of thin-film display technology in which organic compounds form the electroluminescent material, and active matrix refers to the technology behind the addressing of pixels.

As of 2012, AMOLED technology is used in mobile phones, media players and digital cameras, and continues to make progress toward low-power, low-cost and large-size (for example, 40-inch) applications.

DESIGN

An AMOLED display consists of an active matrix of OLED pixels that generate light (luminescence) upon electrical activation that have been deposited or integrated onto a thin film transistor (TFT) array, which functions as a series of switches to control the current flowing to each individual pixel.

Typically, this continuous current flow is controlled by at least two TFTs at each pixel (to trigger the luminescence), with one TFT to start and stop the charging of a storage capacitor and the second to provide a voltage source at the level needed to create a constant current to the pixel, thereby eliminating the need for the very high currents required for passive matrix OLED operation.

TFT backplane technology is crucial in the fabrication of AMOLED displays. Two primary TFT backplane technologies, namely polycrystalline silicon (poly-Si) and amorphous silicon (a-Si), are used today in AMOLEDs. These technologies offer the potential for fabricating the active matrix backplanes at low temperatures (below 150°C) directly onto flexible plastic substrates for producing flexible AMOLED displays.

Source : Wikipedia