Older, CCFL-backlit monitors seems to be less susceptible to this problem, despite also using PWM, simply because the CCFL tube keeps glowing for a few milliseconds, versus LEDs that can blink at literally over a million times a second with no problems. Many are sensitive to this, and get symptoms like eye strain, headaches, nausea, etc. The downside to this approach is that at all brightness levels except 100%, the monitor flickers. This is what it looks like in slow motion (40x). More info (monitor-specific, which PWM is not). For example, if it's on for 1 ms, then off for 4 ms, that gives a flicker frequency of 1/((1+4) * 10 -3 ) = 200 Hz, and a brightness of 1/(1+4) = 20%. How bright it appears depends on the duty cycle, i.e. What this means is that they blink it on and off ~180-500 times a second (depending on the model). Long story short: most (extremely close to "all", I know of 2 exceptions, the new U2312HM revision and HPs ZR2740w 27" monitor) monitors use PWM to control backlight brightness. All older revisions (older than rev A05, or somewhere between Dec 2011 - May 2012) have many complaints about PWM flicker. I'm currently looking at Dell's U2312HM, after reading this thread about how it seems the newer revisions no longer use PWM dimming of the backlight. The 10% rule is enforced on /r/hardware repeat offenders and/or your website or channel may be banned. Users who want to post links to their website should be aware of the reddit definition of spam and read this article concerning self promotion on reddit. No self-edtiorialized titles, just copy the title of the site, with the exception of clickbait titles. No submissions to crowdfunding sites or ongoing campaigns. No submissions to streaming sites outside of event megathreads. Any rumor or claim that is just a statement from an unknown source containing no supporting evidence will be removed. No unsubstantiated rumors - Rumors or other claims/information not directly from official sources must have evidence to support them. This includes 'What should I buy?', 'Does a _ do what I need?', 'How much is _ worth?' and 'How long until (something obvious) happens?' type questions. If your post asks a question about a specific product or need, it probably belongs elsewhere. We allow intelligent discussion posts, but this isn't the place to come for help. This includes "which should I get?" posts. These belong in /r/techsupport or /r/buildapc. Top level comments must be substantive and contain more than 20 characters. Images submitted as self posts must include an informative description for context. Memes, direct image links, and low effort content will be removed. No memes, jokes, or direct links to images Do NOT editorialize the title of the submission (minor changes for clarity may be acceptable). Please use the "suggest title" button for link submissions, or copy the title of the original link. Posts should be about hardware news, reviews, technical discussion or how-tos and buyers guides. Insults and personal attacks aren't welcome here. TL DR: If you can't say something respectfully, don't say it at all.
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