Apple (Steve Jobs) introduced for a few minutes the Apple IPAD! At the moment no infos if the display is an OLED or an LCD Display.
Source

Apple Ipad technical details

• 0.5 inch thin
• 1.5 pounds
• 9.7 inch IPS LCD Display
• Wifi 802.11n
• Bluetooth 2.1 +EDR
• 1 GhZ Apple A4 chip
• 16 GB - 64 GB Flash Storage
• Full capacitive multi touch

In-plane switching (IPS)
In-plane switching is an LCD technology which aligns the liquid crystal cells in a horizontal direction. In this method, the electrical field is applied through each end of the crystal, but this requires two transistors for each pixel instead of the single transistor needed for a standard thin-film transistor (TFT) display. This results in blocking more transmission area, thus requiring a brighter backlight, which will consume more power, making this type of display less desirable for notebook computers.