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Projected screen size shrinks when using wireless projection

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  • Chad Dollahite Mar 23, 2011

    The system is installed and works fine; it was done by a professional group.The problem is when I hook up to it wirelessly via my laptop, the size of the projected area shrinks noticeably. When I connect via VGA, it does not do this. Any ideas?

    Thanks,
    Chad

  • Chad Dollahite Mar 23, 2011

    No cable...when it shrinks, it is a wireless connection. Projector is an NEC NP3250.

    Thanks,
    Chad

  • Chad Dollahite Mar 25, 2011

    I will give them a call asap. Tried it today with a diff. laptop and had the same shrinking of the picture. Strange, but thanks for the help.

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Hi.

The problem is a defect in any case. The picture size is not supposed to change when wireless is on.

On regular projectors the picture size is determined by the geometry settings (fixed), and maintained by two power amp alignment chips called convergence ICs.
If the picture shrinks when you use wireless, either there is a defective component interfeering with alignment circuit operations when wireless adapter kicks in, or the wireless RF transmission is disturbing the alignment of picture.
If the projector is an I lamp self configuring projector (you will know if you have one), then the problem can also be with the geometry self configuration functions.

The projector is in any case malfunctioning. Call the service number listed in the owner manual and discuss the repair or replacement with the manufacturer.

Regards.

Ginko

Posted on Mar 24, 2011

  • Ginko
    Ginko Mar 25, 2011

    Hi.

    The projector is defective if the picture shrank irregularly. If the picture is just smaller check laptop settings. Go to display setting and try changing screen size (personalize in Vista- Display settings in XP).

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How To Pick The Right Projector Screen Size

How To Pick The Right Projector Screen Size



Putting together a home theater? Maybe you are outfitting a boardroom or training room for work with a projector system. You may be asking yourself, What screen size do I need for my room? Here is a simple guide to follow that will work in most any situation giving you the optimal projection screen size:

When determining what size screen to put in any room you will want to answer a few questions first.

1) Projector Native Resolution lets you know which aspect ratio to select for your screen . What is the native resolution of the projector that you have?

2) Ceiling Height allows you to determine the screen height that will fit gracefully into a room. What is the ceiling height of the room that you are outfitting?

3) Distance from Screen to Audience. The people sitting farthest away from the screen determine the minimum screen width. A screen should be at least as wide as 1/6 of the distance between the screen and the viewer farthest from the screen. How far away will the viewer be sitting?

Find out the answers to these questions and you can use a few simple rule of thumb techniques to determine the appropriate screen size.


Projector Native Resolution



First, we want to look at the native resolution (aspect ratio) of the projector being used in the room. This will help you determine what screen format you should go with. Most all projectors nowadays will do both 4:3 and 16:9 aspect ratios. As shown above, a projector with a native 16:9 aspect ratio can letterbox to show a smaller image in 4:3 format. You will want to go by the native aspect ratio in order to get the biggest and best picture.
Ceiling Height

Second, we will want to look at the ceiling height in the room. A screen should be at least 1 ft. down from the ceiling and 3 ft. up from the floor. For example, in an 8 ft. room, a screen should be 4 ft. high at the most. If the room has a slanted ceiling, the screen should be placed at least 1 ft below the ceiling at the point where the screen is going to be installed. This rule of thumb gives you a screen that is gracefully proportionate to the wall and the room. This is especially true for classrooms, boardrooms, and conference rooms where people will be sitting in front of one another.

A home theater application can be a little more liberal with this rule of thumb, unless you have a tiered seating arrangement in a dedicated home theater environment, but I would still think its a good idea to keep it 3 ft. off of the floor. You will be glad you did. If you are mounting your projector to the ceiling, you want the projector to be even with the top of the the screen. Now this rule of thumb is for a maximum screen size. It is OK to go smaller. People tend to focus on what they can see in the center of their field of vision. A person's gaze tends to travel from one portion of the screen to the next when the screen is too big (or the person is sitting too close) to see it all at once. You don't want your audience to get tennis neck.
Distance from Screen to Audience

Finally, we need to look at the distance the audience will be sitting from the screen. For auditoriums, conference, and boardrooms the width of the screen should be no less that 1/6 the distance of the farthest spectator in the audience. For example if the back row of an auditorium is 48 ft. away then the width of the screen should be at least 8 ft. wide. This rule of thumb is for minimum screen size. It is OK to go larger. The important thing is to get a screen that is large enough for the audience in the back row to view comfortably.
How To Apply the Screen Size Rules of Thumb

1) Projector Resolution. I will pretend I have an Infocus IN72 projector, 16:9 aspect ratio for playing Hi-Def movies in a home theater. That means I should use a 16:9 HDTV format screen to get the biggest and best picture.

2) Ceiling Height. My ceilings are 8 ft. high. So my screen should be 48 in. high at the most. That means the largest screen I can fit in my small home theater is 92 in. diagonal 16:9 HDTV format (45 in. H x 80 in W).

3) Distance from Screen to Audience. If I prefer a smaller screen, the rule of thumb that screen width is based on the distance between viewer and screen offers some guidance. For example, if I set up the couch 10 ft. or 120 in. away, then the screen should be at least 20 in. wide (1/6 of 120 in.). That means a screen that is anywhere between 20 in. and 80 in. wide with a 16:9 aspect ratio will fit in my home theater.

Remember to use these points merely as a guide. There is no substitution for good common sense. If you think the screen is going to be too big for your room, go and measure the space. Typically with home theater setups I would not go any bigger than 120" diagonal. Really the recommended size for your basic home theater is in the 100" diagonal range. This will typically give you your best viewing image.

Posted on Mar 23, 2011

  • SANYADE  OMOTOLA
    SANYADE OMOTOLA Mar 23, 2011

    Are you using the same cable with the one you use for the VGA connection?if not troubleshoot the cable..

    Also might be that the connection using that port might not be necessary.. Does ot function properly when you connect it to the port that makes it shrink..

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