How to Achieve an Excellent Visual Presentation

Posted by admin

March 8, 2010

Displays can be difficult at the best time when there is a lot riding on the result, so the last thing you wish to be worrying about is the audio visual element. In this article I’m going to present some basic guidelines that will help you set the room layout so you can attain the very best quality projection from your display.

General Guide-Lines

Viewing

* For optimum viewing, the audience should be seated within:
* +30 degrees of a line perpendicular to the screen’s centre.
* They should be seated no closer then twice the image height.

Note: (If this is not possible perhaps consider multiple viewing options for the audience).

Type of Content

* Entertainment – The last row should be no further than eight times the image height.
* Corporate – The last row should be to six times the image height.
* Critical Applications – The last row should be four times the image height

Setting the Screen

To avoid obstruction of viewing he bottom of the screen should be approximately four feet above the floor. If the seating is staggered, or if the floor is raked you can adjust this appropriately. Try avoiding setting the screen to high. The ergonomics associated with snug viewing indicate no viewer should have to rotate their head more than +30 degrees from straight ahead, or tilt their head not more than 25degrees from horizontal.

Seating

The look of the seating is important so viewers can gain full sight of the projection. Frequently the staggered seating arrangement is best suited for most eventualities. Overall they have to be in rows, with the minimal unobstructed horizontal clearance between plumb lines from the front of an unoccupied seat to the back of the seat in front. This clearance may vary, but is typically sixteen inches ( 400mm ). Aisles must be provided so that there are only 7 seats between any one seat and an aisle. The entry and exit doors need to be consider when planning the layout of the seating. The layout desires to engineered to:

* Allow for easy of enter into the room
* Allow for quick exit in the event of an emergency
* The row contains no more than 100 seats;
* Each doorway serves no more than three rows.
* Aisles must terminate in a cross-aisle.

Front or Rear Projection?

There are a variety of factors that will determine whether front or rear projections are best suited for your displays.

Front Projection

* Front Projection can generally provide a wider viewing-angle than rear projection. It requires: Controlled lighting (ambient light must be kept off the screen to eliminate a reduction in contrast ratio).
* Requires either a projection room at the rear of the theatre, or a platform or mount for the projector(s) out in the theatre. Note that this latter is a potential noise source.
* The projection geometry must be carefully worked out to get the best compromise between image keystoning and blockage of the light path by the audience.
* Must be accessible for maintenance. A projection booth must be dust free (positive pressure preferred), and have adequate ventilation.

Rear Projection

Available in flexible & rigid materials. A rigid screen is more expensive than a front projection screen, and has size restrictions.
Rear projection room must be dust free, and have adequate ventilation.
Requires space behind the screen. Mirrors may be used to reduce the required depth. Must be accessible for maintenance.
Rear Projection Generally has a narrower viewing-angle than front projection – better for long, narrow rooms.

To judge whether front or rear projection will reinforce your display, ask ‘What type of presentation do I want to give’ and “What is the point of the display’. If for instance the display is “canned” you can consider either front or rear projection. If a live talker is interacting with the presentation, rear projection is best so the speaker can engage with the pictures without being in the projector’s light trail. In addition, the higher allowable room illumination allows for note-taking, etc.

Screen Width

Identify your minimum screen height based totally on the distance to your farthest viewer and your ceiling height. This figure might be changed based on the application ( e.g. : an entertainment application will need abigger than minimum size screen for impact ).

ADA Requirements

Where needed arrangements must be made for attendees who need wheelchair access, and / or who have visible or hearing impairments The accessibility and size of these spaces is outlined as :

A minimum number of aisle seats will be required to have either no aisle-side armrest or an aisle-side armrest that folds up. Certain further signage may be required. Your sound system will need the addition of a hearing-assisted system. Your emergency systems may need the addition of strobe signals or visual messaging systems. Your video and other visual display systems may need captioning.

Miscellaneous Considerations

Equipment location

Is vital to avoid any damage. This is generally, but not necessarily, found at the projector ( s ). This equipment may include projection controllers, a show controller, video kit, and audio gear.

Adequate power supply

remember to provide adequate electric power for this equipment and the projector ( s ). Do not forget to permit conduit for speaker cables, control signals, for example. For boardrooms and meeting rooms you’ll also need to provide accessible sources ( such as VCR’s and DVD players ).

Aesthetics or Theme

* Does it require the loudspeakers and other equipment be concealed?
* How is the presentation started?
* Automatically,
* Audience-demand,
* Host-demand, and live presenter (may require random-access control or other interactivity).

Whether your presentation is for the chairman or for an enormous enterprise, taking a minute to plan how you would like to supply the information can make a big difference to your audience. So take a moment a review what you are desiring to point out, how you would like to say it and how is the best way for your audience to receive it. It could make the difference between wining that new job or losing it.

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Article by John Black

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