NOTE: Test on LCD / sample-and-hold. This effect doesn't occur on impulse-driven displays (CRTs, ULMB, LightBoost, impulsed OLED, or other strobe/flicker technologies)
This animation creates a persistence-of-vision effect by panning an image behind tiny slits, like walking along a picket fence and staring through, or scanning through through the crack of a door. This is an enhanced version of the Eye Tracking Demo. It clearly demonstrates the limitation of low refresh rate on any display, including CRT. This effect looks very pixellated on 60 Hz displays. This image becomes progressively sharper, the higher refresh rate you go (such as 240 Hz LCD gaming monitors in non-strobed mode. This effect is noticeably clearer on 1ms TN displays than on IPS/VA LCD panels. Optical Illusion Invented by Mark D. Rejhon of Blur Busters.
Did you know? You need approximately 480Hz+ to be able to read the street name labels in the Panning Map Through Slits animation at 960 pixels per second. This animation demonstrates the limitations of even 120 Hz and 240 Hz displays, and it is still beneficial to go to even higher refresh rates including 480 Hz and 1000 Hz in the future. Laboratory displays (1000Hz+) have confirmed this via this type of animation. Real-world situations include viewing things through dense bushes while moving fast, or moving past picket fences, or tilting head to scan through door cracks. Good full-readability (zero stroboscopic effect & zero motion blur) with rapid occulsion effects, require quadruple-digit refresh rates for good clarity. Spinning LED clocks, LED bike wheel effects, and old mechanical TVs (Nipikow wheels) use the same persistence-of-vision technique (very high Hz for the individual flickering light source). This TestUFO pattern achieves the same effect. The faster the pixels modulate (120Hz, 240Hz), the more detailed the resulting moving image becomes during this test. Real-world situations include tilting head while viewing through a door crack, in order to "scan" the scenery behind the door.