From Wikipedia, the free encyclopedia
(Redirected from Dual-scan)

DSTN (double super twisted nematic), also known as dual-scan super twisted nematic[1] or simply dual-scan, is an LCD technology in which a screen is divided in half, which are simultaneously refreshed giving faster refresh rate than traditional passive matrix screens.[2] It is an improved form of supertwist nematic display that offers low power consumption but inferior sharpness and brightness compared to TFT screens.[2][3][4][5]


For several years (early 1990s[6] to early 2000s), TFT screens were only found in high-end laptops due to them being more expensive and lower-end laptops offering DSTN screens only. This was at a time when the screen was often the most expensive component of laptops. The price difference between a laptop with DSTN and one with TFT could easily be $400 or more. However, TFT gradually became cheaper and has essentially captured the entire market.

DSTN display quality is poor compared to TFT, with visible noise, smearing, much lower contrast and slow response. Such screens are unsuitable for viewing movies or playing video games of any kind.


  1. ^ Kim, J.J.H.; Cho, Rae; Kiachian, J. (November 1997). "Interface issues in displaying graphics and video on high resolution flat panel displays". WESCON/97 Conference Proceedings: 307–313. doi:10.1109/WESCON.1997.632353.
  2. ^ a b "What is DSTN (Double-layer SuperTwisted Nematic)?". www.computerhope.com. 2019-11-16. Retrieved 2022-02-08.
  3. ^ Kawamoto, H. (April 2002). "The history of liquid-crystal displays". Proceedings of the IEEE. 90 (4): 460–500. doi:10.1109/JPROC.2002.1002521. ISSN 1558-2256.
  4. ^ apoor (2001-06-11). "More Than Meets the Eye". ExtremeTech. Retrieved 2023-02-19.
  5. ^ S. Coolidge, Daniel; Jimmerson, J. Michael (1997). A survival guide for road warriors: essentials for the mobile CPA. American Institute of Certified Public Accountants. p. 27. ISBN 0-87051-194-7. OCLC 39913176.
  6. ^ "Toshiba's latest color portable PC checks in with a vibrant display". InfoWorld. 2 March 1992.