Motion Sickness
The final sight line consideration is not as black and white as the first two. If your view of the screen is blocked, even a child would know there is a problem right away. When you have screen size issues, however, the problem is not as crystal clear. While people tend to default to squeezing the largest possible screen they can into the room, this may create a screen that is too big for the main viewing distances.
What it really comes down to is that the size of the screen should be based on the ratio of screen size to its distance from the home theater seating. You don’t want too much of the screen to fill your field of view. This can cause headaches, motion sickness, and vertigo. This problem is easily remedied through a combination of finding the right sized screen for your home theater, and the positioning of the furniture.
The ratio of how much of the screen should fill your field of vision is even a debatable subject among the experts! Dolby Labs (a long time expert in the field) and SMPTE (Society of Motion Picture and Television Engineers) even disagree on the ratio.
As technology has improved in front projectors and resolutions have increased, we’ve actually found that we can go bigger than we have been able to in the past without the motion sickness issues.
At Audio Advice we have come up with a special method to help our clients choose the right size screen. We perform an exercise of letting them experience fast motion video while moving their chair back and forth until they find a comfortable spot. From there we can use simple math to calculate the correct screen size that will be perfect for the layout of their room.
If you are not able to visit us, we do have some tips to help you out.
First, ask yourself where you like to sit at the movies. The front row? Somewhere in the middle? The back? That simple answer can be of great value in coming up with your ideal screen size. Now bear in mind, with a room having multiple rows of seating, each row will have a big difference in the viewing angle and field of vision ratio. If you like sitting towards the front of a movie theater, you’ll probably wind up focusing on the front row. This also means if your guests like the middle or back row, they will love sitting on the second or third row of your theater.
For those of you who like to sit towards the back, you’ll more than likely make your second row the primary focus and drill down your field of vision ratio to this row. Which means when your friends come over they may either love the front row experience or feel it’s a little too big, but with your great sight line design, they still will not get a stiff neck from having to look up.
The lucky ones in the crowd who have a room large enough to support three rows of seats have it pretty easy. There you can use the averages from Dolby and SMPTE and focus on your middle row of seats. Doing this will make the middle row great for those who like to sit in the middle of a movie theater and also make the front row and back row people happy too! The riser heights and screen height off the floor will take more thought here, but with proper planning, you will have an awesome three-row theater!
To learn more about the exact specifics on choosing the right sized screen, check out our blog.