An STN (tremendous-twisted nematic) show is a kind of liquid-crystal show (LCD). STN displays improved on that by twisting the liquid crystal molecules at a much larger angle, sometimes between 180 and 270 levels. An LCD is a flat-panel show that makes use of liquid crystals to change its properties when uncovered to an electric field, which can be used to create photographs. This enables for a sharper picture and passive matrix addressing, a less complicated method to manage the pixels in an LCD. Earlier TN displays twisted the liquid crystal molecules at a 90-diploma angle. This variation is called the twisted nematic (TN) discipline impact.

While STN shows have been as soon as widespread in varied digital units, they have been largely changed by TFT (skinny-movie transistor) displays.

Development
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In 1982, C. M. Waters and E. P. Raynes patented STN displays,[1] and by 1984 researchers at Brown Boveri (later ABB) built the first prototype STN matrix show, with 540 × 270 pixels. [2] A key problem was discovering a way to address more pixels efficiently. Normal TN shows weren’t superb for this due to their voltage characteristics. STN displays, with their 180-270 degree twist, supplied a solution. This twist allows for a clearer distinction between on and off states, making them appropriate for passive-matrix addressing with extra pixels. [3][4]

The primary benefit of STN LCDs is their decrease power consumption and affordability. While nonetheless present in some simple digital merchandise like calculators, STN shows have largely been changed by TFT LCDs, which supply superior image quality and faster response times. They can also be made purely reflective for sunlight readability. In the late 1980s, they were utilized in portable computer systems and handheld units like the Nintendo Sport Boy.

Variants
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CSTN
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CSTN (color super-twist nematic) is a color variant of STN shows, developed by Sharp. Nevertheless, developments have improved response times to one hundred ms (still longer than the eight ms for TFT), widened viewing angles to 140 levels, and enhanced shade high quality, making them a more aggressive choice at about half the cost of TFT shows. A newer passive-matrix expertise, excessive-performance addressing (HPA), affords even better performance than CSTN. Early CSTN shows had limitations like sluggish response occasions and ghosting. It uses red, inexperienced, and blue filters to create colour pictures.

CCSTN
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CCSTN (colour coded STN) is another shade variant of STN, which uses a type of liquid crystal that polarizes totally different wavelengths of mild differently and achieves shade without the usage of sub pixels or shade filters. Theoretically, it could be tuned for any wavelength, however most gadgets could only show crimson, inexperienced, and blue. This impact is known as birefringence. This is possible because it uses a chiral liquid crystal, just like those utilized in mood rings, as a substitute of a more conventional symmetric one. Its utilization of distinctive crystal properties as an alternative of coloration filters improved its brightness and contrast over other colour LCDs on the time. It really works by tuning the polarization amount, which because of the unique crystal over traditional STN shows, is ready to alter the color.

Other STN technologies
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Other STN display variations were launched, trying to enhance image quality and response instances. They embrace:

Double layer STN: Makes use of an extra compensating layer to supply a sharper image.

DSTN (double STN or dual-scan STN): The display screen is divided into halves, and every half is scanned concurrently, thereby doubling the number of traces refreshed per second and providing a sharper look. Widely used on early portable computer systems.

FRSTN (quick-response STN)

FSTN: (movie compensated STN, formulated STN or filtered STN): Uses a film compensating layer between the STN show and rear polarizer for added sharpness and distinction. Used on early portable computer systems before adoption of DSTN.

FFSTN (double movie compensated STN)

MSTN (monochrome STN)

^ Waters, Colin Martin; Raynes, Edward Peter (1982). “Liquid Crystal Units”.

^ European Patent No. EP 0131216: Amstutz H., Heimgartner D., Kaufmann M., Scheffer T.J., “Flüssigkristallanzeige,” October 28, 1987.

^ Scheffer, T. J.; Nehring, J. (1984-11-15). “A new, highly multiplexable liquid crystal display”. Applied Physics Letters. Forty five (10). AIP Publishing: 1021-1023. Bibcode:1984ApPhL..45.1021S. doi:10.1063/1.95048. ISSN 0003-6951.

^ Kelly, Stephen M. (2000). Flat Panel Displays: Advanced Organic Supplies. Royal Society of Chemistry. pp. 115-117. ISBN 0-85404-567-8. Super-twisted nematic show.

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This web page was last edited on 8 January 2026, at 01:00 (UTC).

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