User manual DA-LITE WORSHIP FACILITY FRONT SCREEN PROJECTION

[. . . ] The Da-Lite Difference. Worship Facility Front Screen Projection Guide W O R S h i P FA C i L i T Y FRONT SELECTiON GuiDE SCREEN COMPANY This manual is designed to help users and specifiers of front projection screens select the appropriate screen fabric for their individual Presentation Media requirements. Da-Lite welcomes reproduction of this manual with credit to Da-Lite Screen Company, inc. , Warsaw, indiana. ©2008 DA-LiTE SCREEN COMPANY, iNC. TA b L E O F CO N T E N T S iNTRODuCTiON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 GETTiNG ThE MOST FROM ThiS MANuAL. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 TYPiCAL WORShiP FACiLiTY PROjECTiON APPLiCATiONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 SCREEN SELECTiON CRiTERiA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 SELECTiON CRiTERiA ChECkLiST. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 ViDEO PROjECTiON ­ LCD, DLP, D-iLA AND LCOS TYPES. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 OVERhEAD PROjECTiON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 FiLM/SLiDE PROjECTiON. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 SCREEN FAbRiC DESCRiPTiONS AND SPECiFiCATiONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 SCREEN bORDERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 GLOSSARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 1 iNTRODuCTiON No two worship facilities have the same projection needs. Ambient light, stage lighting, sightlines, ceiling height and a host of other factors make each facility unique. [. . . ] This will provide the actual light levels in the room during a worship service. by taking multiple readings near the screen surface, one can determine the maximum amount of ambient light that will strike the fabric. Once the highest number is determined, it can then be used in the formula below to determine the approximate number of lumens required to make the image appear "bright" in the given lighting environment. With very little to no ambient light, we should have at least 20 lumens per square foot of screen surface (20 foot lamberts) to make sure the image appears "bright" enough. Example: 48 square feet (6x8 screen size) x 20 = minimum 960 ANSi lumen projector however, in order to create a "bright" image with ambient lighting, we must add the number of foot candles striking the screen surface to the equation. To do this, we take the number of foot candles striking the screen surface and multiply it by 5 to determine the minimum lumens required per square foot of the screen (foot lamberts). (Foot candles striking screen surface x 5) = Minimum lumens per square foot (foot lamberts) 9 SCREEN SELECTiON CRiTERiA Therefore, Minimum ANSi lumens of projector = Minimum lumens per square foot x square footage of screen surface. Example: (8 foot candles at screen surface x 5) = 40 lumens per square foot (minimum) 40 lumens per square foot x 48 square feet (6x8 screen size) = 1920 ANSi lumen projector (minimum) Therefore, assuming a 1. 0 or no screen gain, we will need nearly 2, 000 lumens projected onto a 6x8 screen surface in order to overcome the ambient light. it is important to note that it is almost always more economical to control ambient light at the screen surface than it is to purchase a high output projector. CRITERIA #4 ROOM CONFIGURATION/SIZE if the room configuration forces audience members to view the projected image from an angle greater than 30 degrees, multiple screens will be required. Notice, too, that angling the screens in towards the stage will help people look across the platform (towards the leaders on the stage) to the screen on the opposite side. This will increase the eye contact that is necessary for the leaders on the platform to engage with the audience while simultaneously providing the needed projected image. A note of caution: Two side screens angled in as described above will require that the screen is at an angle high enough for the audience members to look slightly over the head of the leaders to see the image. by placing the screens too low, the leaders would actually block the sightlines to the screens! FIGURE 1 Figure 1 Figure 1 FIGURE Figure 2 Figure2 2 10 CRITERIA #5 PROJECTED IMAGE MAKE-UP Determine if the projected image is one or more of the following: a) NTSC/HDTV/Computer Video Signal ­ Generally speaking, a video signal is made up of moving images in which the visual task at hand is watching rather than reading. computer generated song lyrics or message points) require higher resolution to project characters and detail with clarity. CRITERIA #6 PROJECTOR PLACEMENT Determine if the projector will be placed perpendicular to screen center. Whenever the projector and the audience are on opposite sides of the normal and requires higher gain, use a screen that is reflective. Whenever the projector and the audience are on the same side of the normal and requires higher gain, use a screen that is retro-reflective. (Figure 2). FIGURE 1 FIGURE 2 CRITERIA #7 CONTRAST ENHANCEMENT if a high ambient light level is present, a contrast enhancing screen surface is desired. This is the most common application for churches and should be considered instead of the standard "matte white" screens in high brightness rooms. in many worship facility applications, a contrast enhancing screen is desired to provide greater shadow detail in the projected image and help to combat ambient lighting conditions. 11 SCREEN SELECTiON CRiTERiA For ease in collecting the criteria for selecting the proper front projection screen fabric, use the following checklist to record your answers. Then, use the checklist as a guide in completing the decision matrix that follows. [. . . ] in an ideal world, projection equipment would project an image to the exact dimensions of a screen without keystoning. borders help to hide flaws in a projected image by masking out unevenness caused by out-of-level equipment, images improperly framed due to focus limitations or distance from the screen, and slight keystoning caused by the projection image not being aligned 90 degrees to the screen. Serious keystoning as typically found in overhead projectors however, can only be corrected by either raising the height of the projector or purchasing a screen that tilts slightly downward. Depending on the screen surface, borders are available for all four sides of a screen or just on the vertical sides. [. . . ]