BenQ SP920P user manual Obtaining a preferred projected image size

Page 13

Obtaining a preferred projected image size

The distance from the projector lens to the screen, the zoom setting, and the video format each factors in the projected image size.

4:3 is the native aspect ratio of this projector. To be able to project a complete 16:9 (widescreen) aspect ratio image, the projector can resize and scale a widescreen image to the projector's native aspect width. This will result in a proportionally smaller height equivalent to 75% of the projector's native aspect height.

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4:3 aspect image in a 4:3

16:9 aspect image scaled to

aspect display area

a 4:3 aspect display area

Thus, a 16:9 aspect image will not utilize 25% of the height of a 4:3 aspect image displayed by this projector. This will be seen as darkened (unlit) bars along the top and bottom (vertical 12.5% height respectively) of the 4:3 projection display area whenever displaying a scaled 16:9 aspect image in the vertical center of the 4:3 projection display area.

The projector should always be placed horizontally level (like flat on a table), and positioned directly perpendicular (90° right-angle square) to the horizontal center of the screen. This prevents image distortion caused by angled projections (or projecting onto angled surfaces).

The modern digital projector does not project directly forward (like older style reel-to-reel film projectors did). Instead, digital projectors are designed to project at a slightly upward angle above the horizontal plane of the projector. This is so that they can be readily placed on a table and will project forward and upwards onto a screen positioned so that the bottom edge of the screen is above the level of the table (and everyone in the room can see the screen).

If the projector is mounted on a ceiling, it must be mounted upside-down so that it projects at a slightly downward angle.

You can see from the diagram on page 15, that this type of projection causes the bottom edge of the projected image to be vertically offset from the horizontal plane of the projector. When ceiling mounted, this refers to the top edge of the projected image.

If the projector is positioned further away from the screen, the projected image size increases, and the vertical offset also increases proportionately.

When determining the position of the screen and projector, you will need to account for both the projected image size and the vertical offset dimension, which are directly proportional to the projection distance.

BenQ has provided a table of 4:3-aspect-ratio screen sizes to assist you in determining the ideal location for your projector. There are two dimensions to consider, the perpendicular horizontal distance from the center of the screen (projection distance), and the vertical offset height of the projector from the horizontal edge of the screen (offset).

Positioning your projector

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Contents SP920P Digital Projector WelcomeTable of contents With all windows rolled up Important safety instructionsCigarette smoke may contaminate optical 3000 m 10000 feetImportant safety instructions Ceiling mounting the projector Introduction Projector featuresShipping contents Projector exterior view RGB signal output socketFront/upper side Rear/lower side Projector Controls and functionsMute ModeMaking the remote control a wired control Remote control effective rangeOperating the Laser pointer Operating the projector from the frontChoosing a location Positioning your projectorObtaining a preferred projected image size Select your screen size Zoom Projection dimensionsConnecting a computer Connecting a computer or monitorConnection To connect the projector to a notebook or desktop computerTo connect the projector to a monitor Connecting a monitorWith a VGA cable With a VGA to DVI-A cable Connecting Audio Connecting Video source devicesBest video quality Better video qualityTo connect the projector to a Hdmi source device Connecting a Hdmi source deviceTo connect the projector to a DVI-D source device Connecting a DVI-D source deviceTo connect the projector to a Component Video source device Connecting a Component Video source deviceWith a Component Video cable With a Component Video to VGA D-Sub adaptor cableTo connect the projector to an S-Video/Video source device Connecting an S-Video or a composite Video source deviceStarting up the projector OperationUsing a security cable lock Using the On-Screen Display OSD menusUse / to highlight the System Setup Basic menu Securing the projectorSetting a password Utilizing the password functionIf you forget the password To leave the OSD menu, press MENU/EXITChanging the password Entering the password recall procedureDisabling the password function Confirm the new password by re-entering the new passwordChanging Color Space Switching input signalAdjusting the projection angle Adjusting the projected imageAuto-adjusting the image Fine-tuning the image size and clarityCorrecting keystone Magnifying and searching for detailsAbout the aspect ratio Selecting the aspect ratioSelecting a picture mode Using Wall ColorPC input signals D-Sub/Comp. analog RGB and DVI-D DVI-D Optimizing the imageFine-tuning the image quality in user modes Selecting a color temperature Adjusting Brilliant Color3D Color Management Repeat steps 3 to 6 for other color adjustments Setting the presentation timerPress MENU/EXIT to exit and save the settings Follow these steps to utilize this functionHow to use the Timer ON/SHOW key? To cancel the timer, perform the following stepsUsing the remote control Using the OSD menuPossible solutions To exit the OSD menu, press MENU/EXIT Utilizing FAQ functionHiding the image Freezing the imageTo activate the High Altitude Mode Press / or go to the System Setup Basic Panel Key LockLocking control keys Operating in a high altitude environmentAdjusting the sound level Adjusting the soundTurning off the Power on/off ring tone Creating your own startup screenPersonalizing the On-Screen Display OSD menus Setting the lamp modeShutting down the projector Menu structure On-Screen Display OSD MenusMain menu Sub-menu Options Advanced Setup BasicDescription of each menu Auto Power Off Presentation TimerBlank Timer Sleep TimerSecurity Settings Lamp SettingsReset All Settings FAQ-Image InstallationCare of the projector MaintenanceLamp information Setting Auto Power Off Setting Lamp Mode as Dual-ReliableExtending lamp life Timing of replacing the lampScrewdriver Remove the lamp cover from the projector Replacing the lampGo to the System Setup Advanced Lamp Settings menu Resetting the corresponding lamp timerRestart the projector Way into the projectorIndicators Troubleshooting Projector specifications SpecificationsDimensions Supported timing for Analog RGB input Timing chartSupported timing for Component-YPbPrinput Supported timing for Video and S-Video inputsHorizontal Vertical Pixel Frequency Mode ResolutionSupported timing for DVI-D and Hdmi Hdcp input Frequency kHz Frequency Hz MHzRegulation statements Other informationEnglish