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Text of the page (random words):
n segment display edit a typical 7 segment led display component with decimal point in a wide dip 10 package a seven segment display is a display device for digits and some letters it is often used in a device to display numbers for example in a digital clock or calculator to a lesser extent but still common it is used to display alphanumeric information since a seven segment display tends to be less expensive than a display that can better represent any character and even a graphic image such as a dot matrix display the design choice to use a seven segment display is a tradeoff to minimize cost over providing richer functionality 1 history edit seven segment representation of figures can be found in patents as early as 1903 in u s patent 1 126 641 when carl kinsley invented a method of telegraphically transmitting letters and numbers and having them printed on tape in a segmented format in 1908 f w wood invented an 8 segment display which displayed the number 4 using a diagonal bar u s patent 974 943 in 1910 a seven segment display illuminated by incandescent bulbs was used on a power plant boiler room signal panel 2 they were also used to show the dialed telephone number to operators during the transition from manual to automatic telephone dialing 3 they did not achieve widespread use until the advent of leds in the 1970s filament seven segment display some early seven segment displays used incandescent filaments in an evacuated bulb they are also known as numitrons 4 a variation minitrons made use of an evacuated potted box minitrons are filament segment displays that are housed in dip dual in line package packages like modern led segment displays they may have up to 16 segments 5 6 7 there were also segment displays that used small incandescent light bulbs instead of leds or incandescent filaments these worked similarly to modern led segment displays 8 vacuum fluorescent display versions were also used in the 1970s 9 many early c 1970s led seven segment displays had each digit built on a single die this made the digits very small some included magnifying lenses in the design to try to make the digits more legible 10 11 other designs used 1 or 2 dies for every segment of the display 12 13 liquid crystal display lcd largely superseded led seven segment displays the shapes of elements in an lcd panel are arbitrary since they are formed on the display by photolithography while led segments tend to be simple rectangles because they have to be physically moulded to shape which makes it difficult to form more complex shapes however the easy recognition of seven segment displays and the comparatively high visual contrast obtained by such displays relative to dot matrix digits makes seven segment multiple digit lcd screens very common on basic calculators seven segment displays have been recommended against for critical information i e information that is dangerous to health or safety if misread due to misreading if upside down or if segments are stuck on or off 14 backlit dot matrix lcds have largely superseded seven segment displays on such equipment the seven segment display has inspired type designers to produce typefaces reminiscent of that display but more legible such as new alphabet db lcd temp ion b etc the seven segment pattern is sometimes used in posters or tags where the user either applies color to pre printed segments or applies color through a seven segment digit template to compose figures such as product prices or telephone numbers seven segment displays which use a restricted range of letters that look like upside down digits are commonly used by school children to form words and phrases using a technique known as calculator spelling gas station price display calculator that has a tail on the 7 digit apollo guidance computer control panel reproduction marantz cd63se cd player with a vacuum fluorescent display in test mode marantz cc 45 cd player display a beijing bus displaying the route number 695 using a seven segment display implementations edit seven segment displays may use a liquid crystal display lcd a light emitting diode led for each segment an electrochromic display or other light generating or controlling techniques such as cold cathode gas discharge neon panaplex vacuum fluorescent vfd incandescent filaments numitron and others for gasoline price totems and other large signs electromechanical seven segment displays made up of electromagnetically flipped light reflecting segments are still commonly used a precursor to the 7 segment display in the 1950s through the 1970s was the cold cathode neon lamp like nixie tube starting in 1970 rca sold a display device known as the numitron that used incandescent filaments arranged into a seven segment display 15 in ussr the first electronic calculator vega which was produced from 1964 contains 20 decimal digits with seven segment electroluminescent display 16 in a simple led package typically all of the cathodes negative terminals or all of the anodes positive terminals of the segment leds are connected and brought out to a common pin this is referred to as a common cathode or common anode device 17 hence a 7 segment plus decimal point package will only require nine pins though commercial products typically contain more pins and or spaces where pins would go in order to match standard ic sockets integrated displays also exist with single or 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 as described multiple digit led displays as used in pocket calculators and similar devices used multiplexed displays to reduce the number of i o pins required to control the display for example all the anodes of the a segments of each digit position would be connected together and to a driver circuit pin while the cathodes of all segments for each digit would be connected to operate any particular segment of any digit the controlling integrated circuit would turn on the cathode driver for the selected digit and the anode drivers for the desired segments then after a short blanking interval the next digit would be selected and new segments lit in a sequential fashion in this manner an eight digit display with seven segments and a decimal point would require only 8 cathode drivers and 8 anode drivers instead of sixty four drivers and ic pins 18 often in pocket calculators the digit drive lines would be used to scan the keyboard as well providing further savings however pressing multiple keys at once would produce odd results on the multiplexed display some multiple digit displays have only two segments on the left which can only display the number 1 this doubles the range of the display for a modest extra cost in space and silicon such displays are referred to by the number of full 7 segment digits plus one half for example a multimeter capable of displaying values up to 1999 volts or 1 999 amperes might have a 3½ digit display the newcomb benford law implies that adding a 1 on the left might be useful in a larger number of applications than a naïve analysis might suggest for example many buildings have a highest floor numbered between 10 and 19 allowing their elevators to use a 1½ digit display a multiplexed 4 digit seven segment display with only 12 pins a 4 digit display scanning by columns to make the number 1 234 x ray of an 8 digit 7 segment multiplexed led display from a 1970s calculator characters edit main article seven segment display character representations segment names of a seven segment display with an eighth decimal point segment slanted red seven segment display with dot the seven segments are arranged as a rectangle with two vertical segments on each side and one horizontal segment each at the top middle and bottom often the rectangle is oblique slanted which may aid readability in most applications the 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 to try to make them more easily readable the seven elements of the display can be lit in different combinations to represent each of the arabic numerals the individual segments are referred to by the letters a to g and an optional decimal point an eighth segment referred to as dp is sometimes used for the display of non integer numbers 19 17 a single byte can encode the full state of a seven segment display including the decimal point the most popular bit encodings are gfedcba and abcdefg in the gfedcba representation a byte value of 0x06 would turn on segments c and b which would display a 1 16 8 grid showing the 128 states of a seven segment display 20 decimal edit the numerical digits 0 to 9 are the most common characters displayed on seven segment displays the most common patterns used for each of these are 21 alternative patterns the numeral 1 may be represented with the left segments the numerals 6 and 9 may be represented without a tail and the numeral 7 represented with a tail 22 in unicode 13 0 10 codepoints had been given for segmented digits 0 9 in the symbols for legacy computing block to replicate early computer fonts that included seven segment versions of the digits 23 the official reference shows the less common four segment 7 hexadecimal edit the binary coded decimal bcd 0 to 9 digit values require four binary bits to hold their values since four bits 2 4 can hold 16 values this means hexadecimal hex digits can be represented by four bits too 24 due to the limited number of segments in seven segment displays the hexadecimal digits b and d are displayed as lowercase letters to avoid confusion with 8 and 0 respectively 25 26 27 28 the digit 6 must also be displayed with the topmost segment as to avoid ambiguity with the letter b early decoder ics often produced unintuitive patterns or duplicates of digits for 10 15 29 as they were designed to use as few gates as possible and only required to produce 0 9 letters edit many letters of the latin alphabet can be reasonably implemented on a seven segment display though not every letter is available it is possible to create many useful words by careful choice of words one can sometimes work around unavailable letters uppercase letters b i s z and d o conflict with the common seven segment representation of digits 8 1 5 2 and 0 respectively and the lowercase letter g with digit 9 upper case i could be put on the left as lower case l is shown here but this is not often done lowercase b and q are identical to the alternate numerical digits 6 and 9 latin alphabet a b c d e f g h i j k l m n o p q r s t u v w x y z upper lower greek alphabet α β γ δ ε ζ η θ ι κ λ μ ν ξ ο π ρ σ τ υ φ χ ψ ω upper lower the following are some english word examples seen on actual electronic equipment first line appeared on some cd players eight segment display edit eight segment display of the sharp el 8 an eight segment display is a type of display based on eight segments that can be turned on or off according to the font pattern to be produced applications edit one application was in the sharp el 8 an early electronic calculator the eight segment display produces more rounded digits than a seven segment display yielding a more script like output with the trade off that fewer possible alphabetic characters can be displayed because the bars f and g are merged see table below displaying edit an eight segment display can sometimes display alphabetic characters with less readability because the segments f and g are combined and the corners are rounded the asymmetrical layout of the elements produced a distinctive handwritten digit style with a half height 0 characters able to be displayed by a seven segment display but unable to be displayed by an eight segment display due to graphical confusion script characters latin c c d g l n n 0 o r u z ə greek γ ζ ν ξ ο ο π π cyrillic г г д п п э others 0 characters what they display as on an eight segment display c e c l r г t d u ɐ g 6 n ν λ π п a n π п h o ο b z ζ e 0 o ə ο д 8 γ г f ξ c̠ э 9 μ p examples edit sharp el 8 with eight segment displays eight segment display displaying an 8 eight segment display displaying a d nine segment display edit nine segment display alternate alternate alternate an example of a nine segment alphanumeric character set some letters are compromised and most special characters other than the ones shown here are unable to be rendered without significant compromises that would make them illegible more variations a nine segment display is a type of display based on nine segments that can be turned on or off according to the graphic pattern to be produced it is an extension of the more common seven segment display having an additional two diagonal or vertical segments one between the top and the middle and the other between the bottom and the horizontal segments it provides an efficient method of displaying alphanumeric characters the letters displayed by a nine segment display are not consistently uppercase or lowercase in shape a common compromise is to use a lower case n instead of n depending on the design of the display segments the use of the extra two segments may be avoided whenever possible as in the nixxo x page tall lowercase r and y uses edit soviet postcodes upper image preprinted at the bottom left corner of an envelope are six nine segment grids to be filled with the six digits of the postal code bottom image samples of each digit in the grid format in some soviet digital calculators of the 1970s such as the elektronika 4 71b 9 segment displays were used to provide basic alphanumerics and avoid confusions with representing numbers in soviet postcodes digit 3 letter з ze different segments for similar glyphs the extra two bars were slanted forward allowing for an appropriate looking и and to differentiate the numeral 3 from the letter з the sharp compet calculator also uses a 9 segment display allowing a small range of characters and symbols to be used nine segment displays are used in many timex digital watches and some pagers such as the nixxo xpage 30 the arch br502 pager 31 and the scope geo n8t 32 they are also used in some epson stylus printers and newport iseries digital meters 33 the display used in the iseries is unique in that it has a vertical extra segment at top and a fully backwards leaning slant for the extra segment at bottom this allows for a somewhat more natural appearing r and m pinball tables produced by bally from 1986 to 1989 used nine segment scoring displays 34 a nine segment display has been developed for displaying bengali 35 and roman numerals citation needed nine segment vacuum fluorescent display postal code nine segment sample on an envelope postcard from latvia just before its independence fourteen segment display edit the individual segments of a fourteen segment d...