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Judder is a mixture of [[smearing]] and [[strobing]]. Judder can significantly reduce visual quality of a [[VR]] display. The smearing aspect of the Judder is caused by low [[refresh rate]] or high [[persistence]] of the display. smearing occurs when each pixel moves across the retina while it is lit. <ref>http://blogs.valvesoftware.com/abrash/down-the-vr-rabbit-hole-fixing-judder/</ref>
Judder can be reduced by increasing the [[refresh rate]] of the display. When refresh rate is high enough, judder will not longer be visible to the human eyes, effectively eliminating the phenomenon. To truly eliminate smearing, refresh rate of 1000 Hz is needed. Currently this is almost impossible to do due to technical limitations. Another, more practical, method is to use [[low persistence]] display. In a low persistence display, each pixel is lit for a very short amount of time, less than 2 ms. Because lit pixel will no longer move across the retina, smearing dissipates. Low persistence also reduces the effect of strobing. Increasing refresh rate can further eliminate strobing
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