For serious gamers, success boils down to the split-second decisions you make on the fly. Because of this, gamers need to ensure that nothing gets in the way of their decision making, including the gear they use for their gaming setup. From accessories to hardware, hardcore gamers are used to looking for the highest performing equipment they can find, and the same goes for their display solutions.
When it comes to gamers who are looking for an immersive experience, there has been a growing movement away from traditional TVs/displays in favor of gaming projectors. For these gamers, input lag is one of the main criteria when picking the ideal projector.
But what is input lag? How do you measure input lag on a projector? How can you reduce input lag on your projector? Is input lag the be-all and end-all for judging the performance of a projector for gaming?
For projectors, input lag (or latency), it refers to the time between the projector receiving audio/video signal from the input source (the gaming console) and actually projecting the video that corresponds to the signal. It can cause lag time or image stuttering. Because of this phenomenon and how it may affect your ability to play at the highest level, low input lag time is one of the key things to focus on when determining whether a projector will boost or hamper your gaming abilities, as you want a projector that instantaneously projects the video that the console is transmitting to it so as to make sure that you’re able to make those split second decisions.
It’s worth noting that input lag time is somewhat different then response time. Response time in gaming refers to the duration of time from when a button is pressed to when the character performs a corresponding action. Response time involves all the hardware of the gaming setup, while input lag time refers only to the part of the equation involving the input signal and projector.
With an understanding of what input lag is, the next step is to figure out how input lag is measured and how this knowledge can be applied to choosing a gaming projector. For most gaming projectors, input lag time is listed in its product specs using milliseconds (ms) as the unit of measurement, so for a projector with a listed input lag time of 16 ms there will be a 16 millisecond gap between when the projector receiving signal from the gaming console and when the resulting image is projected. For some this may seem like just a sliver of time, but for serious gamers it could be a matter of life or death (figuratively of course). The calculations used to derive the value itself is a result of the projector’s resolution and refresh rate, along with the engineering of the projector. As a result, most specs that list the input lag time will also list the conditions in which that value was measured, including resolution, refresh rate, and any corresponding video modes used, all of which gamers should take into consideration when comparing projectors.
Likewise, refresh rate, or refresh frequency, is another useful concept when judging the performance of a projector. Strictly speaking, refresh rate is the rate at which a projector projects the images or frames in a video broadcast. You can think of it as essentially the frame rate for a projected video. Whereas frame rate is usually measured in frames per second (FPS), refresh rate is measured in hertz (Hz), but both are pretty much the same thing. So, in other words, a projector with a refresh rate of 120Hz projects 120 frames every second. Why refresh rate is an important measure for a projector’s performance is because a higher refresh rate, i.e. a greater number of frames projected per second, means a video with cleaner, smoother motion and less blur.
Given the knowledge of how input lag time is measured and how it can be identified in a projector’s specifications, how then is a user supposed to ensure that the projector they’ve purchased achieves the input lag time advertised in its specs. A sizeable amount of gaming projectors on the market feature a pre-configured fast mode that helps reduce input lag when it is enabled. It’s recommended that when shopping for a projector, gamers double-check to see if their prospective purchase features such a mode, and once purchased that they activate the mode prior to gaming. Beyond that, it is also highly recommended that gamers further boost their projector’s speed by turning off any additional image processing functions such as keystoning, aspect ratio manipulations, and overscanning. Doing this will further complement the fast mode feature and ensure that your projector is working at its fastest speed possible.
Despite all the discussion above regarding input lag, there are also plenty of other considerations to make when purchasing a gaming projector, especially if you are doing so in order to create a more immersive gaming experience. This includes attention towards the color accuracy, overall image quality, and rendering of details by the projector. For BenQ this has led to the development of our GameMaestroTM suite of features. GameMaestro combines features such as special video/sound modes and detail adjustments designed specifically for different gaming genres coupled with a high-performance fast mode that reduces input lag to a minimum.
An addendum to this whole discussion is a note to gamers that brands which advertise projectors with 4K resolution and a 240Hz refresh rate are promoting misleading claims. Such claims are misleading because these projectors are not actually able to produce such results simultaneously. Whereas these projectors do have the capacity to provide 4K resolution, their hardware is only able to reach a 240Hz refresh rate when the resolution is downgraded to 1080p FHD resolution, so the labelling of 4K and 240Hz side-by-side with one another is a misnomer meant to attract attention. Another related item to note is the fact that as of now no gaming consoles are able to output 240Hz content, so to purchase a projector with 240Hz refresh rate capabilities for gaming purposes is to spend extra for something that might not be used for years.