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Seven-segment display

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Seven-segment display

A seven-segment display (SSD), or seven-segment indicator, is a form of electronic display device for displaying decimal numerals that is an alternative to the more complex dot matrix displays.
Seven-segment displays are widely used in digital clocks, electronic meters, basic calculators, and other electronic devices that display numerical information.

Concept and visual structure

The individual segments of a seven-segment display
16x8-grid showing the 128 states of a seven-segment display
The common segment displays shown side by side: 7-segment, 9-segment, 14-segment and 16-segmentdisplays.
The seven elements of the display can be lit in different combinations to represent the arabic numerals. Often the seven segments are arranged in an oblique (slanted) arrangement, which aids readability. In most applications, the seven segments are of nearly uniform shape and size (usually elongated hexagons, though trapezoids and rectangles can also be used), though in the case of adding machines, the vertical segments are longer and more oddly shaped at the ends in an effort to further enhance readability.
The numerals 6, 7 and 9 may be represented by two or more different glyphs on seven-segment displays, with or without a 'tail'.
The seven segments are arranged as a rectangle of two vertical segments on each side with one horizontal segment on the top, middle, and bottom. Additionally, the seventh segment bisects the rectangle horizontally. There are also fourteen-segment displays and sixteen-segment displays (for full alphanumerics); however, these have mostly been replaced by dot matrix displays.
The segments of a 7-segment display are referred to by the letters A to G, where the optional decimal point (an "eighth segment", referred to as DP) is used for the display of non-integer numbers

Displaying letters

LED-based 7 segment display which cycles through the common glyphs of the ten decimal numerals and the sixhexadecimal"letter digits" (A, b, C, d, E, F)
Hexadecimal digits can be displayed on seven-segment displays. A combination of uppercase and lowercase letters is used for A–F;[8] this is done to obtain a unique, unambiguous shape for each hexadecimal digit (otherwise, a capital D would look identical to an 0/O and a capital B would look identical to an 8). Also the digit 6 must be displayed with the top bar lit to avoid ambiguity with the letter b.
Hexadecimal encodings for displaying the digits 0 to F
Digitgfedcbaabcdefgabcdefg
00×3F0×7Eononononononoff
10×060×30offononoffoffoffoff
20×5B0×6Dononoffononoffon
30×4F0×79ononononoffoffon
40×660×33offononoffoffonon
50×6D0×5Bonoffononoffonon
60×7D0×5Fonoffononononon
70×070×70onononoffoffoffoff
80×7F0×7Fononononononon
90×6F0×7Bononononoffonon
A0×770×77onononoffononon
b0×7C0×1Foffoffononononon
C0×390×4Eonoffoffonononoff
d0×5E0×3Doffononononoffon
E0×790×4Fonoffoffonononon
F0×710×47onoffoffoffononon

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