Scan line

Short description: One row in a raster scanning pattern

Scanlines on a Mitsubishi CS-40307 CRT color television. The fine dots through the bright scanlines are due to the shadow mask. PAL video signal scan line. From the left: horizontal sync pulse, back porch with color burst, signal itself, front porch, sync pulse, back porch with color burst, video portion of the next scan line. The signals from multiple lines are overlaid, showing shaded areas instead of a single curve.

A scan line (also scanline) is one line, or row, in a raster scanning pattern, such as a line of video on a cathode-ray tube (CRT) display of a television set or computer monitor.[1]

On CRT screens the horizontal scan lines are visually discernible, even when viewed from a distance, as alternating colored lines and black lines, especially when a progressive scan signal with below maximum vertical resolution is displayed.[2] This is sometimes used today as a visual effect in computer graphics.[3]

The term is used, by analogy, for a single row of pixels in a raster graphics image.[4] Scan lines are important in representations of image data, because many image file formats have special rules for data at the end of a scan line. For example, there may be a rule that each scan line starts on a particular boundary (such as a byte or word; see for example BMP file format). This means that even otherwise compatible raster data may need to be analyzed at the level of scan lines in order to convert between formats.

## See also

* Flicker (screen)
* Interlaced video
* Scanline rendering
* Stroboscopic effect

## References

1. ↑ Keith Jack and Vladimir Tsatsulin (2002). Dictionary of Video and Television Technology. Newnes. p. 242. ISBN 978-1-878707-99-4. https://books.google.com/books?id=4Hsh7J0d1DwC&q=scan-line+video+display+computer+television&pg=PA242.
2. ↑ Wesley Fenlon (15 January 2014). "In Search of Scanlines: The Best CRT Monitor for Retro Gaming". Tested. http://www.tested.com/tech/gaming/456719-best-crt-retro-games/.
3. ↑ Gabriel B. (December 2012). "Freeware Friday: Maldita Castilla". Blistered Thumbs. http://www.blisteredthumbs.net/2012/12/ff-maldita-castilla/.
4. ↑ Robin Stuart Ferguson (2001). Practical algorithms for 3D computer graphics. A K Peters, Ltd. p. 104. ISBN 978-1-56881-154-3. https://books.google.com/books?id=bBOxUmw83jUC&q=scanline+row-of-pixels&pg=PA104.

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Display technology

Video displays|

| Current
generation|

* Eidophor
* Electroluminescent display (ELD)
* Electronic paper
* E Ink
* Gyricon
* Light emitting diode display (LED)
* Cathode-ray tube (CRT) (Monoscope)
* Liquid-crystal display (LCD)
* TFT
* TN
* LED
* Blue Phase
* IPS
* Plasma display panel (PDP)
* ALiS
* Digital Light Processing (DLP)
* Liquid crystal on silicon (LCoS)

|

Next
generation|

* Organic light-emitting diode (OLED)
* AMOLED
* microLED
* Organic light-emitting transistor (OLET)
* Surface-conduction electron-emitter display (SED)
* Field emission display (FED)
* Laser TV
* Quantum dot
* Liquid crystal
* MEMS display
* IMoD
* TMOS
* Quantum dot display (QD-LED)
* Ferro liquid crystal display (FLCD)
* Thick-film dielectric electroluminescent technology (TDEL)
* Telescopic pixel display (TPD)
* Laser-powered phosphor display (LPD)

Non-video|

* Electromechanical
* Flip-dot
* Split-flap
* Vane
* Eggcrate
* Fiber optic
* Nixie tube
* Vacuum fluorescent display (VFD)
* Light-emitting electrochemical cell (LEC)
* Lightguide display
* Dot-matrix display
* Seven-segment display (SSD)
* Nine-segment display
* Fourteen-segment display (FSD)
* Sixteen-segment display (SISD)

3D display|

* Stereoscopic
* Autostereoscopic
* Multiscopic
* Hologram
* Holographic display
* Computer-generated holography
* Volumetric
* Musion Eyeliner
* Fog display

Static media|

* Jumbotron
* Movie projector
* Neon sign
* Destination sign
* Slide projector
* Transparency
* Laser beam

Display capabilities|

* EDID
* CEA-861
* DisplayID

Related articles|

* History of display technology
* Large-screen television technology
* Optimum HDTV viewing distance
* High-dynamic-range imaging (HDRI)
* Color Light Output
* Flexible display

Comparison of display technology

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