Many displays do indeed do blurring at the lesser end of the sharpness scale, as mseebach notes, and their 'no alteration' point is then normally about 10% from

Many displays do indeed do blurring at the lesser end of the sharpness scale, as mseebach notes, and their 'no alteration' point is then normally about 10% from the bottom. It can be easily observed on edges that aren't text, even if text is subpixel rendered.