When it comes to slim monitors, BenQ already holds the title but the latest model confirms that it can still go thinner. With only 15mm thickness (it’s actually very thin), this 21.5″ display prompts to be the world’s thinnest of its class. Aside from that magnificent feature, it also sports a HDMI support at a 1920×1080 resolution, 250 nits of brightness, 1000:1 real contrast ratio, and 5ms response time. Now, which is the real slim LCD?