There is one more interesting thing about this display: the backlight lamp is modulated. To control brightness, the manufacturer used a width-pulse modulation of the lamp power supply (as you know, LCD displays use fluorescent lamps with high-frequency power supply, about 40…60kHz) with a frequency of about 260Hz. This was quite clear in the oscillograms, taken at a low brightness level (when brightness is high, the impulse width gets larger and independent impulses practically converge into one):

Of course, the eye cannot discern such frequencies, so all the things mentioned above are nothing more but just a curious fact.

xbitlabs的評測提過一種背光燈（？）閃爍，亮度低的時候
是不是這種？

http://www.xbitlabs.com/articles/ot...response_3.html