So far we have looked at using LEDs, seven segment displays, serial character LCDs, and parallel character LCDs to relay information to users. To design modern embedded systems, users demand more. Many users, thanks to the smartphone revolution, expect to be able to interact with their devices using touch displays. In addition, OLED technology is rapidly replacing LCD technology. For these reasons, this chapter looks at going a bit further and using OLEDs and touch screen LCDs (see Figure 10-1).