AMOLED

AMOLED (active-matrix organic light-emitting diode, /ˈæmoʊˌlɛd/) is a display technology 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 2008, 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 generating 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.

After School (band)

After School (Hangul: 애프터스쿨, Katakana: アフタースクール, often stylized as AFTERSCHOOL, abbreviated as A.S.) is a South Korean girl group formed by Pledis Entertainment in 2009, with an admissions and graduation concept. The band currently consists of six members: Uee, Raina, Nana, Lizzy, E-Young and Kaeun. After School officially debuted in January 2009. Later that year they released "Because of You", which was ranked number 1 on multiple music charts.

The group debuted in Japan in 2011 under Avex Trax with a remake of their Korean hits "Bang!", "Diva", "Shampoo" and "Because of You". Their Japanese debut was successful, and they entered the Oricon Weekly Chart at number seven. The group also released an original Japanese song, "Rambling Girls", in January 2012. The group's debut Japanese album, Playgirlz, debuted at number eight on the Oricon Weekly Album Chart.

History

Pre-debut

After School was first formed following Kahi's departure from Korean-American girl group S-Blush. Kahi alongside the current CEO of Pledis Entertainment planned to produce a new group together. The first member other than Kahi was Bekah, who was a trainee while Kahi was in S-Blush. Bekah was brought from Hawaii to South Korea, and had been strongly recommended by the CEO. Before joining the group, they were then introduced to Jungah, followed by the admission of Jooyeon and Soyoung to form a five-member group.