This is the biggest ever tablet I've ever seen. Well this is not actually the complete but Ardic Technology have used a normal size Android Honeycomb tablet connecting it to a 1080p touch screen with basic gestures, which is about 65" inch (161.5 cms) LCD.
This 65 inch tablet has a inbuilt two touch sensors that support simple gestures such as pinching and swiping, it also has audio, video 1080p and HDMI port.
Watch the below demo where ARDIC Technology, a startup based in Istanbul, Turkey has given a wonderful demonstration of this huge sized tablet.
They have used Motorola Xoom tablet which is connected to the HDMI port. The tablet is powered by an NVIDIA Tegra 2 SoC, and includes 1GB of RAM, 16GB of flash memory, dual cameras, HDMI, USB, microSD and 3G and WiFi connectivity.