SQUARES projecting on screen. Is this normal?

[bendavid25]

I have a Hitachi/Dukane 8049. It is a nice unit, specially for what I paid for it. But when the image is projected on the screen it projects the image in thousands of little squares, thus effecting the resolution. Is this normal?

I adjusted the focus as best as possible and the unit is about 15 feet from the wall, but I can still see the 1/8 - 1/4inch squares.

Is this how projector units project? Is there anyway to minimize this? Should I move the unit closer or not use the image enlarger?

Any input would be really appreciated. Thanks.

 

[zaner21]

Digital projectors have a fixed number of pixels. Having a specific number of pixels means that each pixel is a fixed size in relation to the size of the screen. The larger the screen size, the larger the pixel thus the easier it is to see this pixel structure. The area between each pixel can be bigger or smaller depending on the manufacture and is referred to as the dot pitch. When you look at the screen all of these intersection outline the pixels and create a screen door effect. It got that name because the image looks similar to the image you would see if you were looking thru the screen on a storm door. The small the dot pitch the smaller the screen door effect on the image. DLP and LCOS are better than LCD with the screen door effect but they all have it some extent.

My question for you is. Would the squares that you are referring too be each of these pixels or are there several pixels that make up each square?

My guess is you are seeing each pixel and the screen door effect is bothering you. The easiest fix is to make the projected image smaller so you can’t see the dot pitch lines so easily but that might put your projector in an undesirable location. Some people have suggested that you adjust the focus so that it is just barely, barely out of focus so that it blurs the dot pitch lines to make them less noticeable. Other than those two things your next option would be to get a different projector with a higher resolution. Hope that helps.

Zaner21

 

[bendavid25]

Digital projectors have a fixed number of pixels. Having a specific number of pixels means that each pixel is a fixed size in relation to the size of the screen. The larger the screen size, the larger the pixel thus the easier it is to see this pixel structure. The area between each pixel can be bigger or smaller depending on the manufacture and is referred to as the dot pitch. When you look at the screen all of these intersection outline the pixels and create a screen door effect. It got that name because the image looks similar to the image you would see if you were looking thru the screen on a storm door. The small the dot pitch the smaller the screen door effect on the image. DLP and LCOS are better than LCD with the screen door effect but they all have it some extent.

My question for you is. Would the squares that you are referring too be each of these pixels or are there several pixels that make up each square?

My guess is you are seeing each pixel and the screen door effect is bothering you. The easiest fix is to make the projected image smaller so you can’t see the dot pitch lines so easily but that might put your projector in an undesirable location. Some people have suggested that you adjust the focus so that it is just barely, barely out of focus so that it blurs the dot pitch lines to make them less noticeable. Other than those two things your next option would be to get a different projector with a higher resolution. Hope that helps.

Zaner21

Great. Thanks for the feedback it was very helpfull. I can live with the squares for now, just wanted to make sure it was normal and see if there was a remedy. I will try adjusting the focus.

Thanks again.

Jamie