HDLU-1414 is a 3.7mm four character 5 x 7 dot matrix displays driven by an on-board CMOS IC. These displays are pin for pin compatible with the HPDL-1414.The IC stores and decodes 7-bit ASCII data and displays it in an easy to read 5x7 font. Multiplexing and LED drive circuitry is also included in the display, and fast setup and hold times allow it to interface easily with common microprocessors. 

The address and data inputs can be directly connected to microprocessor address and data buses. The HDLU-1414 offers a larger character set than the HPDL-1414. Lower case letters and special symbols are now offered, made possible by the 5 x 7 dot matrix character layout. The difference between the sunlight view-able HDLS-1414 and the low power HDLU-1414 lies in the brightness level.