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Output lag - Wikipedia, the free encyclopedia
(Redirected from Input lag) Jump to: navigation, search ... 5 Output lag versus response time. 6 Mislabeling the issue as input lag. 7 References ...
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YouTube - Input Lag Demo - Dell 2408WFP vs ViewSonic VP2030b
A real world example of input lag, Dell 2408WFP vs ViewSonic 2030b ... No matter, input lag don't bother me even in game. :) View all 10 comments ...
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AnandTech: 24" LCD Roundup
We have five new 24 ... Input Lag and Response Times ... heard frequent complaints about input lag on various LCDs, particularly after ...
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YouTube - Dell 2408WFP Input lag Rfactor
Comparativa Input Lag entre monitores modelo Dell 2408WFP y 2407WFP-HC, utilizando el software RFactor ... 2408wfp input lag. 00:47 From: immortalityHW. Views: ...
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Talk:Input lag - Wikipedia, the free encyclopedia
... less processing and thus should (not will) have less input lag. ... "we've already determined that there is no set input lag value for any given display. ...
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Reports | Input Lag and You: Dell 2408WFP | APH Networks
But how about input lag? ... issues of Dell 2408WFP's input lag problems. ... Input lag is not really a problem at all, and I believe it's safe to say 99% of ...
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AnandTech
I'm beginning to think that S-PVA may somehow account for the input lag. ... The two TN panels match it in terms of input lag (sorry - I no longer stock CRTs) ...
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LCD input Lag problems: new tests of 2405fpw and 244t - [H]ard|Forum
LCD input Lag problems: new tests of 2405fpw and ... At this point the input lag on the Dell 2405fpw, once I set the ... realized the input lag was driving me ...
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Input lag is a phenomenon associated with some types of LCD displays, and nearly all types of HDTVs, that refers to Latency (engineering), or lag measured by the difference between the time a signal is input into a display and the time it is shown by the display. This lag time has been measured as high as 65ms, or the equivalent of 3-4 frames on a 60Hz display. Currently, the only TFT LCD panels known to have this phenomenon are so-called overdrive panels. These include S-PVA, S-MVA, and Overdrive-TN panels. S-PVA have been observed to suffer from greater input lag than P-MVA panels, while IPS, S-IPS and AS-IPS panels are not or only minimally affected.

Causes of input lag While the pixel response time of the display is usually listed in the monitor's specifications, no manufacturers advertise the input lag of their displays, likely because the trend has been to increase input lag as manufacturers find more ways to process input at the display level before it is shown. Possible culprits are the processing overhead of HDCP, Digital Rights Management, and also DSP techniques employed to reduce the effects of ghosting, however no conclusive investigations have been performed, and the cause may vary depending on the model of display.

LCD and Plasma displays, unlike CRT's, have a native resolution. That is to say that there are discrete pixel elements directly on these displays. One common source of input lag that is separate from others is the introduction of latency due to internal scaling for non-native resolutions. As an example, a display that has a native resolution of 1600x1200 being provided a signal of 640x480 must scale width and height by 2.5x in order to display the image provided by the computer on the native pixels. In order to do this, advanced signal processing is required, which can be a source of introduced latency. Anecdotally, input lag is significantly less when displays operate in native resolutions for a given LCD screen. External devices have also been shown to reduce overall latency by providing faster image-space resizing algorithms than those present in the LCD screen.

Testing for input lag Input lag is easier "felt" than seen. As such, proving the existence of this phenomenon requires an elaborate set-up (at least for a home computer system). Tests for this phenomenon usually involve a test display (the display being measured), a control display (usually a CRT) that would ideally have no input lag, a computer capable of mirroring output to two displays, stopwatch software, and a high-speed camera pointed at the two displays running the stopwatch program. The lag time is measured by taking a photograph of the displays running the stopwatch software, then subtracting the two times on the displays in the photograph. This method only measures the difference in input lag between two displays and cannot determine the absolute input lag of a single display. CRTs are preferable to use as a control display because their input lag is typically negligible. Also, video mirroring does not guarantee that the same image will be sent to each display at the same point in time. However, since the results of this test are easily reproducible, even when the displays are plugged into different ports and different cards, suggests that the effect is attributable to the display and not the computer system.

Effects of input lag on users Depending on the monitor, input lag times between 10ms and 65ms have been measured. However, the effects of the delay on the user depend on the user's own sensitivity to it. In the application of gaming, the type of game being played is another factor that may increase one's perception of lag. For instance, in a relatively slow MMORPG such as World of Warcraft, slight delays are far more tolerable than in medium paced tactical shooters like Counter-strike or especially in fast-action shooters such as Unreal Tournament.

Input lag contributes to the overall latency in the interface chain of the user's inputs (mouse, keyboard, etc...) to the graphics card to the monitor. Most sensitive users can tolerate latency under 20ms.

Input lag versus response time LCD screens with a high response time value often do not give satisfactory experience when playing fast paced computer games. But an LCD screen with high response time AND significant input lag is unsuitable for playing fast paced computer games or performing fast high accuracy operations on the screen (e.g. CAD design). Manufacturers only state the response time of their displays and do not inform customers of the input lag value.

External links

• BeHardware test
• Video demonstrating input lag in Quake
• Video demonstrating input lag in UT2003
• Video demonstrating input lag in Windows UI
• BeHardware tests 22inch TFT monitors for input lag
• Avs Forum posting on input lag