A touchscreen is an electronic visual display that can detect the presence and location of a touch within the display area. The term generally refers to touching the display of the device with a finger or hand. Touchscreens can also sense other passive objects, such as a stylus. Touchscreens are common in devices such as all-in-one computers, tablet computers, and smartphones.
The touchscreen has two main attributes. First, it enables one to interact directly with what is displayed, rather than indirectly with a pointer controlled by a mouse or touchpad. Secondly, it lets one do so without requiring any intermediate device that would need to be held in the hand (other than a stylus, which is optional for most modern touchscreens). Such displays can be attached to computers, or to networks as terminals. They also play a prominent role in the design of digital appliances such as the personal digital assistant (PDA), satellite navigation devices, mobile phones, and video games.

LCD extension board allows to extent LPC-4350 board with Samsung LCD touch screen with 320x240px resolution.

For schematics diagram download lcd-eb1-schematic.pdf file.

On the following pictures you can see LCD extension board main components:

There are several main components available:

1. Demoboard Connector		J1 to plug extension board to compatible LPC-4350-DB1 or LPC-1850-DB1 demoboard.
2. LCD / Touch Screen		LCD screen.
3. Button		S1 button for assigning user action.