Required Screen Size and Pixel Density for Portable LCD Televisions
Satoru Kubota, Arihiro Nomura · The Journal of The Institute of Image Information and Television Engineers · 2004
We investigated the required screen size and pixel density for portable LCD televisions for viewing a moving picture at 30 cm. Twenty-five subjects adjusted the size of the movie player window on LCD screens with various pixel densities. The results indicated that the optimal screen size was about four inches in diagonal when the pixel density of the screen was more than 170 ppi. The smallest acceptable size for viewing a moving picture was about 2 inches in diagonal. A three-inch diagonal satisfied 85 % of the subjects.