Technically that applies to any LCD monitor. If there was no backlight bleedthrough the crazy numbers you see for dynamic contrast ratios would apply to static contrast ratios too. The simple fact is even the best LCD monitors let a little bit of light through when ideally they would be displaying black. Sometimes this can be as little as 0.3 lux which is very good really, but it still counts as 'bleedthrough'. The excess bleedthrough whereby you can see patches of purple/blue etc. occurs to varying degrees and sometimes that isn't a problem even on TN LCD panels.