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- Flicker_(screen) abstract "Flicker is a visible fading between cycles displayed on video displays, especially the refresh interval on cathode ray tube (CRT) based computer screens. Flicker occurs on CRTs when they are driven at a low refresh rate, allowing the brightness to drop for time intervals sufficiently long to be noticed by a human eye – see persistence of vision and flicker fusion threshold. For most devices, the screen's phosphors quickly lose their excitation between sweeps of the electron gun, and the afterglow is unable to fill such gaps – see phosphor persistence. A similar effect occurs in PDPs during their refresh cycles.For example, if a cathode ray tube's vertical refresh rate is set to 60 Hz, most screens will produce a visible "flickering" effect, unless they use phosphor with long afterglow. Most people find that refresh rates of 70–90 Hz and above enable flicker-free viewing on CRTs. Use of refresh rates above 120 Hz is uncommon, as they provide little noticeable flicker reduction and limit available resolution.Since the shutters used in liquid crystal displays for each pixel stay at a steady opacity, they do not flicker, even when the image is refreshed. The backlights of such displays typically operate in the range of 150–250 Hz. But, to save the crystals from deterioration caused by constant current, voltage is constantly reversed, which may cause flicker. "In a pixel on an LCD monitor, the amount of light that is transmitted from the backlight depends on the voltage applied to the pixel. For the amount of light, it doesn't matter whether that voltage is negative or positive. However, applying the same voltage for a long period would damage the pixel. For example, electricity decomposes water into oxygen and hydrogen gas. A comparable similar effect could happen inside the liquid crystals that are in the pixels. In order to prevent damage, LCD displays quickly alternate the voltage between positive and negative for each pixel, which is called 'polarity inversion'. Ideally, the rapid polarity inversion wouldn't be noticeable because every pixel has the same brightness whether a positive or a negative voltage is applied. However, in practice, there is a small difference, which means that every pixel flickers at about 30 hertz."The lighting used in film projectors is typically an incandescent lamp or arc lamp, which does not flicker, but some degree of flicker is desirable to help decrease the flicker fusion threshold comfortably below film's typical framerate of 24 fps. This is usually accomplished with a shutter which causes the lamplight to apparently strobe on and off at a multiple of the framerate, most often 48–96 Hz.The exact refresh rate necessary to prevent the perception of flicker varies greatly based on the viewing environment. In a completely dark room, a sufficiently dim display can run as low as 30 Hz without visible flicker. At normal room and TV brightness this same display rate would produce flicker so severe as to be unwatchable.Chewing something crunchy such as Doritos or granola can induce flicker perception due to the vibrations from chewing synchronizing with the flicker rate of the display.Another factor in detecting flicker is peripheral vision. The human eye is most sensitive to flicker at the edges of human field of view, and least sensitive at the center of gaze (the area being focused on). As a result, the greater the portion of our field of view that is occupied by a display, the greater is the need for high refresh rates. This is why computer monitor CRTs usually run at 70 to 90 Hz, while TVs, which are viewed from further away, are seen as acceptable at 60 or 50 Hz (see Analog television Standards).".
- Flicker_(screen) wikiPageExternalLink Farrell_Flicker_1987.pdf.
- Flicker_(screen) wikiPageID "616886".
- Flicker_(screen) wikiPageLength "7461".
- Flicker_(screen) wikiPageOutDegree "41".
- Flicker_(screen) wikiPageRevisionID "676875735".
- Flicker_(screen) wikiPageWikiLink Aliasing.
- Flicker_(screen) wikiPageWikiLink Analog_television.
- Flicker_(screen) wikiPageWikiLink Arc_lamp.
- Flicker_(screen) wikiPageWikiLink Backlight.
- Flicker_(screen) wikiPageWikiLink Brightness.
- Flicker_(screen) wikiPageWikiLink Category:Display_technology.
- Flicker_(screen) wikiPageWikiLink Category:Television_technology.
- Flicker_(screen) wikiPageWikiLink Cathode_ray_tube.
- Flicker_(screen) wikiPageWikiLink Color_depth.
- Flicker_(screen) wikiPageWikiLink Computer_display.
- Flicker_(screen) wikiPageWikiLink Computer_graphics.
- Flicker_(screen) wikiPageWikiLink Computer_monitor.
- Flicker_(screen) wikiPageWikiLink Computer_program.
- Flicker_(screen) wikiPageWikiLink Crunchy.
- Flicker_(screen) wikiPageWikiLink Display_device.
- Flicker_(screen) wikiPageWikiLink Dizziness.
- Flicker_(screen) wikiPageWikiLink Doritos.
- Flicker_(screen) wikiPageWikiLink Double_buffering.
- Flicker_(screen) wikiPageWikiLink Electron_gun.
- Flicker_(screen) wikiPageWikiLink Fatigue_(medical).
- Flicker_(screen) wikiPageWikiLink Flicker-free.
- Flicker_(screen) wikiPageWikiLink Flicker_fusion_threshold.
- Flicker_(screen) wikiPageWikiLink Frame_buffer.
- Flicker_(screen) wikiPageWikiLink Frame_rate_control.
- Flicker_(screen) wikiPageWikiLink Framebuffer.
- Flicker_(screen) wikiPageWikiLink Granola.
- Flicker_(screen) wikiPageWikiLink Headache.
- Flicker_(screen) wikiPageWikiLink Headaches.
- Flicker_(screen) wikiPageWikiLink Hertz.
- Flicker_(screen) wikiPageWikiLink Incandescent_lamp.
- Flicker_(screen) wikiPageWikiLink Incandescent_light_bulb.
- Flicker_(screen) wikiPageWikiLink LCD_backlight.
- Flicker_(screen) wikiPageWikiLink Liquid-crystal_display.
- Flicker_(screen) wikiPageWikiLink Liquid_crystal_display.
- Flicker_(screen) wikiPageWikiLink Motion_sickness.
- Flicker_(screen) wikiPageWikiLink Movie_projector.
- Flicker_(screen) wikiPageWikiLink Multiple_buffering.
- Flicker_(screen) wikiPageWikiLink Nausea.
- Flicker_(screen) wikiPageWikiLink Persistence_of_vision.
- Flicker_(screen) wikiPageWikiLink Phosphor.
- Flicker_(screen) wikiPageWikiLink Phosphor_persistence.
- Flicker_(screen) wikiPageWikiLink Plasma_display.
- Flicker_(screen) wikiPageWikiLink Refresh_rate.
- Flicker_(screen) wikiPageWikiLink Screen_tearing.
- Flicker_(screen) wikiPageWikiLink Temporal_dithering.
- Flicker_(screen) wikiPageWikiLink True_Color.
- Flicker_(screen) wikiPageWikiLink Vertical_refresh.
- Flicker_(screen) wikiPageWikiLink Video_display.
- Flicker_(screen) wikiPageWikiLink Visual_perception.
- Flicker_(screen) wikiPageWikiLink Z-fighting.
- Flicker_(screen) wikiPageWikiLinkText "Flicker (screen)".
- Flicker_(screen) wikiPageWikiLinkText "Flicker".
- Flicker_(screen) wikiPageWikiLinkText "display flicker".
- Flicker_(screen) wikiPageWikiLinkText "flicker trick".
- Flicker_(screen) wikiPageWikiLinkText "flicker".
- Flicker_(screen) wikiPageWikiLinkText "flickering".
- Flicker_(screen) wikiPageWikiLinkText "flickers".
- Flicker_(screen) wikiPageWikiLinkText "screen flicker".
- Flicker_(screen) hasPhotoCollection Flicker_(screen).
- Flicker_(screen) wikiPageUsesTemplate Template:Citation_needed.
- Flicker_(screen) wikiPageUsesTemplate Template:Clarify.
- Flicker_(screen) wikiPageUsesTemplate Template:Full.
- Flicker_(screen) wikiPageUsesTemplate Template:Other_uses.
- Flicker_(screen) wikiPageUsesTemplate Template:Refimprove.
- Flicker_(screen) wikiPageUsesTemplate Template:Reflist.
- Flicker_(screen) subject Category:Display_technology.
- Flicker_(screen) subject Category:Television_technology.
- Flicker_(screen) hypernym Fading.
- Flicker_(screen) comment "Flicker is a visible fading between cycles displayed on video displays, especially the refresh interval on cathode ray tube (CRT) based computer screens. Flicker occurs on CRTs when they are driven at a low refresh rate, allowing the brightness to drop for time intervals sufficiently long to be noticed by a human eye – see persistence of vision and flicker fusion threshold.".
- Flicker_(screen) label "Flicker (screen)".
- Flicker_(screen) sameAs m.02x0nx.
- Flicker_(screen) sameAs Q17053030.
- Flicker_(screen) sameAs Q17053030.
- Flicker_(screen) wasDerivedFrom Flicker_(screen)?oldid=676875735.
- Flicker_(screen) isPrimaryTopicOf Flicker_(screen).