seven-segment display

(redirected from 7-segment display)
Also found in: Dictionary.

seven-segment display

A common display found on digital watches and readouts that looks like a series of 8s. Each digit is formed by selective illumination of from one to seven separately addressable segments. For more details, see LCD types. For more on color LCDs, see LCD subpixels.


Seven-segment Display
Using two seven-segment digits, this readout can display from 00 to 99. Each of the seven segments has its own contact to the outside electronics. (Image courtesy of LXD, Inc.)







Seven-Segment Odometer
This seven-segment display shows the vehicle's mileage. Notice how seven segments make up the digits.









A Single Segment
The above illustration highlights one segment of the liquid crystal layer in a monochrome twisted nematic (TN) seven-segment display (Image courtesy of LXD, Inc.) In their natural state, liquid crystals line up with the orientation "rubbed" into the front and rear glass panels. The rubbings are microscopic grooves.

In this "positive image" example, the background is lit, while the dark segments that make up the desired letters and digits are unlit. Notice that the front and rear planes are oriented 90 degrees from each other. The top left segment is the result of ambient light traveling from the viewer down the crystals and reflected back up the same twisted ladder. Light follows the liquid crystal path.

The top right segment gets no light, because the crystals reorient perpendicular to the rear polarizer, which absorbs the light.

Reflective vs. Backlit
In low-cost calculators and readouts, a reflector bounces ambient light back to the viewer. However, reflective displays are hard to read in dim light. A backlight provides a source of light at all times (see transmissive LCD). Passive displays may be reflective or backlit, but active matrix TV and computer screens are always backlit (see LCD types and LED TV). See flat panel display, LCoS and indium.
Copyright © 1981-2019 by The Computer Language Company Inc. All Rights reserved. THIS DEFINITION IS FOR PERSONAL USE ONLY. All other reproduction is strictly prohibited without permission from the publisher.
References in periodicals archive ?
With additional monitoring functions on the 7-segment display that include high condensate level warning, clogged filter mat alarm, enclosure internal temperature and any error messages, the health of the cooling unit can be checked at a glance.
The 7-segment display which is built into the sensing head informs already at the spindle of the occurrences
New Yorker Electronics is a franchise distributor for Vishay and supplies the full line of Vishay Optoelectronics including Optocouplers, Optical Sensors, 7-Segment Displays, Infrared Receivers, Solid-State Relays, LCD Displays, Visible LEDs, Infrared Emitters, Plasma Displays, Photo Detectors, IrDA Transceivers and Infrared Touch Panels.
The DL-030 FPGA-based Microprocessor Design Trainer features an Altera Cyclone Ill FPGA, Altera Nios II embedded processor, a software CD with powerful designing/implementing tools, a 137-page lab manual, an iPad version of the lab manual available on iTunes, 11 hands-on labs correlated to any textbook for microprocessor design training, works with any Windows XP or higher system (32-bit only), a rugged blow-molded carrying case, 100 machined pin hookup wires, 16 LEDs, three 7-segment displays, 16 slide switches and three pushbutton switches, four each, regulated 5V power (Vcc) and ground (GND), and eight input/output connection sockets.