A Rotating LED Display

Abstract

Rotating LED is a display technique based on persistence of vision. In compared with convention LED display technology; this technique greatly reduces the number of LEDs used by time-space sharing concepts through a high speed rotating device. Hence, the demand of complex electronic driving circuits for the LEDs is greatly decreased. This kind of rotating display is also made possible to be a creative decoration device for various applications. In this project, a prototype rotating LED display was made with enhanced control functionality in user-device interface. With only 8 LEDs used in this device, its display resolution can up to 8 x 240 pixels, which means a total of 1920 LEDs are needed to provide equivalent resolution using conventional display technology. In our design, a Bluetooth and a sound detection module are added. With the Bluetooth module, the rotating LED device is able to receive command directly from other Bluetooth devices, such as a PC or a smartphone. Different text messages displayed either in static or scrolling, graphic patterns, digital clock, and other functionality can be controlled directly through other Bluetooth devices in real time, hence increasing the attractiveness of the device for decoration or advertisement purposes. While with the sound detection module, some simple function of the display, such as ON/OFF, can be controlled through the clapping hands. The whole design can be scaled up easily with additional single or multiple colors LEDs for more complex display effects.