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When I project certain material like movies and sports I see a juddering or rippling effect or it's slightly blurred. What's wrong?

RELATES TO:

  • Projectors
  • Image quality and settings

TABLE OF CONTENTS:

EXPLANATION:

If some projection is jerky or suffers from rippling or juddering effects, particularly during slow, panning camera movements, then the issue is likely to be that the projector settings need to be adjusted to suit the type of material you are projecting. There are settings that can improve the appearance of fast-moving images such as sports and can also be adjusted for movies with panning shots and fast-moving action sequences, and the projection of still images.

There are several factors which can affect the appearance of visual media when it is played back. This doesn't just affect projected images, these factors can affect other types audio/visual equipment such as televisions, computer monitors, and other display devices. Such factors include:

  • Frame rate of moving image material (e.g. movie or video clip)
  • Frame rate of the source or playback device (e.g. TV signal, DVD player, Blu-ray player, HD player)
  • Refresh rate of output display device (e.g. projector, TV, computer monitor)
  • Pull-down (e.g. 1:1, 2:2, 3:2, 2:3, 4:4) of output display device

Media with moving images such as film/movies and video images (e.g. TV, home movies) is composed of many unique consecutive images called frames. Frame rate is a measurement of the frequency (or rate) at which these frames are produced by an imaging device (e.g. a film or video camera), and is expressed in Hz or frames per second (FPS). Frame rates in video games refer to the speed at which the image is refreshed.

The frame rate of the media depends on the device that has produced it. For example, movies are normally recorded at 24fps, whereas video clips (such as those recorded with a camcorder) may be recorded at a lower or higher framerate (e.g. 16fps, 30fps). Some US TV programs are also filmed at 30fps.

When a device plays back such material e.g. a movie, it will normally play it back at the same rate that it is recorded in e.g. a DVD player will playback at 24fps but this is not always the case (some early models of Blu-ray players did not support playback at 24fps for example and scaled it up to 60fps/60i). The output device may be a TV or in this case a projector, and in order for the playback of the moving images to be correct or smooth, the rate of playback should match that particular type of material. However, as there are different types of film/video/moving image material, a single display device (e.g. TV, projector, monitor) will need to have a refresh rate that supports the different frame rates of different material. Most output display devices have one refresh rate only. Some of the latest technology allows the refresh rate to be adjusted by using a pull-down setting such as 4:4. The Epson EH-TW5000/TW5800 allows you to enable pull-down of 4:4 or have it at 2:3. The EH-TW3800 allows you to enable pull-down to 2:2 or have it at 2:3.

We recommend experimenting with the settings to find the best combination for the media you are viewing. The following may be used as a guide:

Media Playback device/settings Projector settings
Motion Detection/Frame Interpolation (Setting) Pull-down (Setting) Progressive
Photographs/slideshow Digital Still Camera/other source OFF/Low OFF/Low ON/Normal
Home video clips Digital Camera/Camcorder/other source OFF/Low OFF/Low ON/Normal
TV program with fast-moving images (e.g. sport) Analogue/Digital (SD quality) ON (higher value/High) OFF OFF/Auto
HD TV program with fast-moving images (e.g. sport) Digital HD quality ON (normal/high value) ON OFF/Auto or Film
HD movie transmitted via TV channel Digital HD quality OFF/Low ON Film/Auto
PAL DVD Upscaled via HD/Blu-ray player OFF** OFF OFF/Auto

Film/Auto
NTSC DVD Multi-region DVD/HD/Blu-ray player OFF** OFF (TW3800)* OFF/Auto

Film/Auto
Blu-ray Blu-ray player, 24fps at 1080p OFF/Low** ON OFF/Auto

Film/Auto
Blu-ray Some early model Blu-ray players/PS3 @ 1080p/60 output ON/Normal** OFF OFF/Auto

Film/Auto

*This is detected and set automatically with EH-TW5000/TW5800. It reverses the 2:3/3:2 pull-down performed by PAL DVD/Blu-ray players.
**May be better adjusted to 'ON/High' if the material you are viewing contains a lot of fast-moving scenes.


In some cases you may benefit from changing the Progressive setting in the "Signal" Configuration menu. This can be set only when signals are being input from the [Video] / [S-Video] input port, or 480i, 576i, 1080i signals are being input from the [Component] / [HDMI1] / [HDMI2] input port.)
Interlace (i) signals are converted to progressive (p) signals using a method appropriate for the image.

Refer to the guidance below. The EH-TW3800 and EH-TW5000/TW5800 are used as examples here. The "Progressive" settings available vary depending on your home cinema model but these can be used as a guide.


EH-TW3800:

  • Off
  • : This is ideal for using when viewing images with a large amount of movement.
  • Video
  • : This is ideal for general video images.
  • Film/Auto
  • : Optimum conversion is performed for movie, computer graphics, and animation input signals.


    EH-TW5000/TW5800:

  • Video
  • : This is ideal for general video images.
  • Film
  • : This is ideal for film images. Select this if the setting is "Auto" and flickering appears in the film images.
  • Auto
  • : Optimum conversion is performed for movie, computer graphics, and animation input signals.

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