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A seven-segment display (sometimes written as 7-segment display) is a form of display that predates the now ubiquitous dot-matrix displays. Seven segment displays are commonly used in electronics as a method of displaying decimal numeric feedback on the internal operations of devices. A display device is a device for visual or tactile presentation of images (including text) acquired, stored, or transmitted in various forms. ...
A dot matrix is an array of dots used to generate characters, symbols and images. ...
Two digital voltmeters The field of electronics is the study and use of electronic devices that operate by controlling the flow of electrons or other electrically charged particles in devices such as thermionic valves and semiconductors. ...
Concept and visual structure
 A typical 7-segment LED display component, with decimal point. A seven segment display, as its name indicates, is composed of seven elements. Individually on or off, they can be combined to produce standardized representations of the arabic numerals. single unit seven segment display File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
single unit seven segment display File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...
Red, pure green, and blue LEDs. ...
Arabic numerals (also called Hindu numerals or Hindu-Arabic numerals) are by far the most common form of symbolism used to represent numbers. ...
The seven segments are arranged as a rectangle of two vertical segments on each side with one horizontal segment on the top 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are also fourteen-segment displays and sixteen-segment displays (for full alphanumerics); however, these have mostly been replaced by dot-matrix displays. In geometry, a rectangle is a defined as a quadrilateral polygon in which all four angles are right angles. ...
LCD fourteen-segment display as used on the HP-41 range of programmable engineering calculators of the 1980s. ...
Segment layout, showing all 16 segments. ...
Generally speaking, the term alphanumeric refers to anything that consists of only letters and numbers. ...
A dot matrix is an array of dots used to generate characters, symbols and images. ...
Usually, but not always, the seven segments are arranged in an oblique, or italic, arrangement, which aids readability. Italic type is a form of type that slants slightly to the right and uses different glyph shapes, used to distinguish or otherwise set off certains words within text. ...
The segments of a 7-segment display are referred to by the letters A to G, as follows:
AAAA F B F B F B GGGG E C E C E C DDDD DP where the optional DP decimal point (an "eighth segment") is used for the display of non-integer numbers. The decimal separator is used to mark the boundary between the integer and the fractional parts of a decimal numeral. ...
In addition to the ten numerals, seven segment displays can produce some latin letters: uppercase A, B, C, E, F, G, H, I, J, L, N, O, P, S, U, Y, Z, and lowercase a, b, c, d, e, g, h, i, n, ñ, o, q, r, t, u. Some of these shapes, however, are visually highly ambiguous and rely on context and the experience of the reader to be properly understood and distinguished from each other. On a related note, school children and students have been known to produce letters and words from upside-down calculator displays. The Latin alphabet, also called the Roman alphabet, is the most widely used alphabetic writing system in the world. ...
A calculator is a device for performing numerical calculations. ...
Implementations Most separate 7-segment displays use an array of light-emitting diodes (LEDs), though other types exist using alternative technologies such as cold cathode gas discharge, vacuum fluorescent, incandescent filament, liquid crystal display (LCD), etc. An alternative to the 7-segment display in the 1950s through the 1970s was the vacuum tube-like nixie tube. Integrated displays also exist, with multiple digits. Some of these integrated displays incorporate their own internal decoder, though most do not – each individual LED is brought out to a connecting pin. Red, pure green, and blue LEDs. ...
Diagram of a copper cathode in a Daniells cell. ...
Reflective twisted nematic liquid crystal display. ...
// Events and trends The 1950s in Western society was marked with a sharp rise in the economy for the first time in almost 30 years and return to the 1920s-type consumer society built on credit and boom-times, as well as the height of the baby-boom from returning...
This article provides extensive lists of events and significant personalities of the 1970s. ...
A nixie tube is an electronic device for displaying numerals or other information, in the form of a glass tube containing multiple cathodes and a wire mesh anode, filled with neon and often a little mercury and/or argon at a small fraction of atmospheric pressure. ...
 LED seven-segment display showing hex digits. Seven segment displays can be found in patents as early as 1908 (United States patent 974943, for example), but did not achieve widespread use until the advent of LEDs and LCDs in the 1970s. They are sometimes even used in unsophisticated displays like cardboard "For sale" signs, where the user either applies color to pre-printed segments, or (spray)paints color through a seven-segment digit template, to compose figures such as product prices or a telephone numbers. Wikipedia does not have an article with this exact name. ...
Wikipedia does not have an article with this exact name. ...
// Representing hexadecimal Some hexadecimal numbers are indistinguishable from a decimal number (to both humans and computers). ...
A patent is a set of exclusive rights granted by a state to a person for a fixed period of time in exchange for the regulated, public disclosure of certain details of a device, method, process or substance (known as an invention) which is new, inventive and useful. ...
A template is some form of device to provide a separation of form or structure from content. ...
For many applications, dot-matrix LCDs have largely superseded LED displays, though even in LCDs 7-segment displays are very common. Unlike LEDs, the shapes of elements in an LCD panel are arbitrary since they are formed on the display by a kind of printing process. In contrast, the shapes of LED segments tend to be simple rectangles, reflecting the fact that they have to be physically moulded to shape, which makes it difficult to form more complex shapes than the segments of 7-segment displays. However, the high common recognition factor of 7-segment displays, and the comparatively high visual contrast obtained by such displays relative to dot-matrix digits, make seven-segment multiple-digit LCD displays very common on basic calculators. In geometry, a rectangle is a defined as a quadrilateral polygon in which all four angles are right angles. ...
In visual perception, contrast is the difference in visual properties that makes an object (or its representation in an image) distinguishable from other objects and the background. ...
A calculator is a device for performing numerical calculations. ...
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