Light-emitting diodes (LEDs) arc semiconductor devices that illuminate solely by motion of electrons. When forward-biased, these things emit light. LEDs provide a cheap and convenient way to display information electronically, fit easily into an electrical circuit, and are durable (Zilog Inc. Application Note, 8x8 LED Dot Matrix Display with Z8 Encore. July 2008)

Dot Matrix VS. 7-segment Display

LEDs arc often arranged in patterns to display information. The 7-segment configuration of an LED arranged in the form of digit 8 can be restrictive in that it does not adequately allow the display of some alphanumeric characters. By contrast, the versatility of a dot matrix arrangement allows an LED unit to display complicated shapes. A 8x8 LED dot matrix is the appropriate device for displaying characters (About LEDs, Grccnworld LED Solutions, Inc.,

Why used Led dot matrix?

The LED dot matrix is the most versatile display in our line of LED displays. It is suitable for any application that requires numeric, alphabetical and symbolic/graphic information to be displayed. Choose a smaller pixel size for a crisper message and combine multiple modules for larger displays (Dot Matrix Displays. October 2008). Practically, a LED dot matrix is

A shift register is a circuit which uses flip-flops connected in line so that each bit which is stored at the Q output is shifted to the next flip-flop in line at each clock pulse. Shift registers from a very important class of components in all types of digital circuits because the flip-flop output is changed only by a clock pulse after the input has been changed, the removal of clock pulses, leaving only the supply voltage present leaves the output of the flip-flop unchanged for as long as these conditions are maintained. There arc many type of shift register ICs but in this study, 741,8138 shift register will be used. The 741.8138 is a high¬speed 8-bit Serial-In Parallel-Out Shift Register. Serial data is entered through a 2-input AND gate synchronous with the LOW to HIGH transition of the clock. The devices features an asynchronous Master Reset which clears the register setting all outputs LOW independent of the clock