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.
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.