Provided is a wearable personal digital device and methods for enlarging display space using the wearable personal digital device. The wearable personal digital device may comprise a processor, a memory unit, an expandable display, a camera, a projector, a communication circuit, a swipe card reader, one or more biometric sensors, one or more accelerometers, a housing, and a band. The expandable display is be communicatively coupled to the processor and configured to expand to enlarge display space using a flip up portion, detachable portion, or bending the expandable display. The band may include one or more rechargeable batteries configured to power the wearable personal digital device. Biometric sensors and accelerometers provide data for monitoring health and activity of the user. The swipe card reader is configured to read payment card data.