- Mar 21, 2004
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Motion blur is a stupid post processing effect found in games.
Also a real life phenomenon that looks nothing like that which is found in games and only occurs when moving very fast and looking nearby: http://forums.anandtech.com/showthread.php?t=2082412
http://en.wikipedia.org/wiki/Motion_blur
Ghosting is when you move the screen and text blurs out on an LCD, also any wire mesh pattern would blur together. You see a "ghost image".
Although according to wikipedia motion blur is used interchangeably with ghosting to describe the above-mentioned effect.
http://en.wikipedia.org/wiki/Ghosting
Refresh rate is how many times per second the luminous phosphorous is hit by electronics in a CRT, or UV rays in a plasma display. When the phosphorous is hit it produces visible light in the right color for a moment and then fades away. If the refresh rate is too low, you would be able to make out the flickering of the display.
http://en.wikipedia.org/wiki/Refresh_rate
There is technically a "refresh rate" for LCDs as well but it is different kind... LCDs are always on so the pixels do not have to be "refreshed" to keep them from flickering. But the image does have to be changed to display new pictures (see frame rate). The LCD's refresh rate is thus its frame rate.
Sub-field drive: Subfield drive is a new fancy name for the refresh rate of a plasma screen; Companies selling plasma screens are now claiming that their high "subfield drive" is the reason you do not get ghosting in plasma; that is a lie.
The extremely high refresh rate of plasma screens is actually the reason they do not visibly flicker as a CRT does, it has absolutely nothing to do with why they do not ghost/motion blur. So when marketing tells you that 600Hz subfield drive is why your plasma doesn't ghost, ignore them.
Also, the refresh rate of plasma has absolutely nothing to do with frame rate, subfield drive is typically 600 Hz, frame rate is typically 60; it simply refreshes the exact same frame 10 times.
Response time is how long it takes each pixel to change from the previous color to the new one. This is a problem that is limited to LCDs. CRTs, plasma, etc all have a response time, its just much better than an LCD to the point where it is not an issue; also for those displays the pixel shows color for a moment when it is hit by electrons or UV, and then it goes dark... so most of the time its black and not displaying any color; LCDs on the other hand have a constant backlight source with a polarized liquid crystal, when the liquid crystal changes it polarization it will display all colors "betwee" the current color and the target color to which it changes to (for a fraction of a second):
http://en.wikipedia.org/wiki/Response_time_(technology) EX: the modernest of all LCDs manage 2ms response time... older ones would go over 20ms.
Frame rate (of a display) is how many different pictures your display receives per second. A 60Hz frame rate display (the standard) will display 60 unique pictures per second. Higher refresh rate (such as a plasma screen's 600Hz) would mean that the same picture would be displayed more then once.
All displays have a refresh rate, plasma, CRT, LCD, or any other.
Your computer also outputs a certain frame rate, termed FPS (frames per second). If your combination of game settings, video card, and CPU are able to produce 24 FPS then you are sending the monitor 24 frames per second. Since that is below the 60 it can actually display, then it will simply repeat the same picture more then once. Mismatch between frame sending and frame displaying will cause tearing. This occurs whether your video card is producing more or less FPS than 60.
Also, all the above means that if your monitor only displays 60 frames per second, and your video card is producing 100+, then only 60 of those 100+ unique frames will get displayed, making the rest wasted.
http://en.wikipedia.org/wiki/Frame_rate
There is a problem with displays called Tearing which is related to framerate, Some claim that higher frame rate solve tearing or that tearing is limited to LCDs and not found in CRTs. Both claims are untrue. Tearing is found in both LCDs and CRTs, and occur whether your FPS exceeds or falls under the framerate of your monitor. There is a solution though, it is called v-sync. V-sync stands for vertical synchronization. It simply means that the video card will synchronize its output with monitor such that the FPS produced by the video card will be capped at the monitor's max (60 FPS), and that they will be synced to be sent over after the monitor finished displaying the current picture but before the next one (so it does not update the monitor's picture to be displayed halfway through the displaying, thus causing tearing)
http://en.wikipedia.org/wiki/Screen_tearing
Also a real life phenomenon that looks nothing like that which is found in games and only occurs when moving very fast and looking nearby: http://forums.anandtech.com/showthread.php?t=2082412
http://en.wikipedia.org/wiki/Motion_blur
Ghosting is when you move the screen and text blurs out on an LCD, also any wire mesh pattern would blur together. You see a "ghost image".
Although according to wikipedia motion blur is used interchangeably with ghosting to describe the above-mentioned effect.
http://en.wikipedia.org/wiki/Ghosting
Refresh rate is how many times per second the luminous phosphorous is hit by electronics in a CRT, or UV rays in a plasma display. When the phosphorous is hit it produces visible light in the right color for a moment and then fades away. If the refresh rate is too low, you would be able to make out the flickering of the display.
http://en.wikipedia.org/wiki/Refresh_rate
There is technically a "refresh rate" for LCDs as well but it is different kind... LCDs are always on so the pixels do not have to be "refreshed" to keep them from flickering. But the image does have to be changed to display new pictures (see frame rate). The LCD's refresh rate is thus its frame rate.
Sub-field drive: Subfield drive is a new fancy name for the refresh rate of a plasma screen; Companies selling plasma screens are now claiming that their high "subfield drive" is the reason you do not get ghosting in plasma; that is a lie.
The extremely high refresh rate of plasma screens is actually the reason they do not visibly flicker as a CRT does, it has absolutely nothing to do with why they do not ghost/motion blur. So when marketing tells you that 600Hz subfield drive is why your plasma doesn't ghost, ignore them.
Also, the refresh rate of plasma has absolutely nothing to do with frame rate, subfield drive is typically 600 Hz, frame rate is typically 60; it simply refreshes the exact same frame 10 times.
Response time is how long it takes each pixel to change from the previous color to the new one. This is a problem that is limited to LCDs. CRTs, plasma, etc all have a response time, its just much better than an LCD to the point where it is not an issue; also for those displays the pixel shows color for a moment when it is hit by electrons or UV, and then it goes dark... so most of the time its black and not displaying any color; LCDs on the other hand have a constant backlight source with a polarized liquid crystal, when the liquid crystal changes it polarization it will display all colors "betwee" the current color and the target color to which it changes to (for a fraction of a second):
http://en.wikipedia.org/wiki/Response_time_(technology) EX: the modernest of all LCDs manage 2ms response time... older ones would go over 20ms.
Frame rate (of a display) is how many different pictures your display receives per second. A 60Hz frame rate display (the standard) will display 60 unique pictures per second. Higher refresh rate (such as a plasma screen's 600Hz) would mean that the same picture would be displayed more then once.
All displays have a refresh rate, plasma, CRT, LCD, or any other.
Your computer also outputs a certain frame rate, termed FPS (frames per second). If your combination of game settings, video card, and CPU are able to produce 24 FPS then you are sending the monitor 24 frames per second. Since that is below the 60 it can actually display, then it will simply repeat the same picture more then once. Mismatch between frame sending and frame displaying will cause tearing. This occurs whether your video card is producing more or less FPS than 60.
Also, all the above means that if your monitor only displays 60 frames per second, and your video card is producing 100+, then only 60 of those 100+ unique frames will get displayed, making the rest wasted.
http://en.wikipedia.org/wiki/Frame_rate
There is a problem with displays called Tearing which is related to framerate, Some claim that higher frame rate solve tearing or that tearing is limited to LCDs and not found in CRTs. Both claims are untrue. Tearing is found in both LCDs and CRTs, and occur whether your FPS exceeds or falls under the framerate of your monitor. There is a solution though, it is called v-sync. V-sync stands for vertical synchronization. It simply means that the video card will synchronize its output with monitor such that the FPS produced by the video card will be capped at the monitor's max (60 FPS), and that they will be synced to be sent over after the monitor finished displaying the current picture but before the next one (so it does not update the monitor's picture to be displayed halfway through the displaying, thus causing tearing)
http://en.wikipedia.org/wiki/Screen_tearing
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