here we are not watching the images the monitors good for images may not be good for dots.
we are watching the dots not pixels, dots have only color no brightness.
more resolution more details of graphs. each candle is made up of dots.
so for selection of monitor main criteria is resolution not pixel depth.
a chart in 22 inches 1920X1080 monitor looks same in 36 inches 1920x1080
even 16 inches 1920x1080 looks same
while buying the monitor keep this point in mind.