Hi! To bring some new info to this thread, there's a post below from russian-speaking hardware forum ixbt.com
It is google translated so sorry for readability.
This guy wrote a post about specific monitor model.
There is a clever way of sharpening, patent WO1996007115A1 - Improved polarizer (improved polarizer). The polarizer consists of many small waveguide cones. Which allows you to improve viewing angles, contrast and sharpness!. The light from the monitor is not solid (scattered, as in real life), but thin rays (10-40% of the size of the subpixel). The brain is not able to distinguish these rays, but the eyes catch, which leads to their tension. Such cone polarizers in various configurations are now commonly used. I changed the polarizer from "improved" to normal - the eyes get tired much less. Without sharpening, the text looks unusual, you need to look a little closer, but the text itself looks like in a book, without unnatural clarity. But with an improved polarizer I can read from a meter, I see everything, although I shouldn't, it's too far and shallow. The eyes have to pay for such clarity. Oddly enough, in some people, their eyes react to increased clarity the other way around. I showed 2 monitors to my friend, the first one with a very sharp polarizer, the second one with a moderate one, so he said that the first one had a normal text washed in the second one. The Ya. Market is full of reviews about fuzzy text, I think that's why. In monitors where there is no sharpness adjustment in the menu, it remains intact. And the differences in clarity are due to different polarizers. Patent citations:
The present invention is advantageous to use because viewability around the normal to the plane of the liquid crystal device is improved and when viewed at high angle, the quality of the image is improved in that it exhibits better contrast and sharpness
One advantage of placing the polarizer element and the array of tapered waveguides in close proximity is that the distance between the liquid crystal display device elements (pixels) and the array of tapered waveguides is minimized which results in an image with greater sharpness, contrast, and color purity