BenQ SP840 user manual Obtaining a preferred projected image size

Page 15

Obtaining a preferred projected image size

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

16:9 is the native aspect ratio. SP840 can project a complete 16:9 (widescreen) image.

4:3 aspect image in a 16:9

16:9 aspect image scaled to a 4:3 aspect

aspect display area

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 17, 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 screen sizes to assist you in determining the ideal location for your projector. Refer to "SP840 projection dimensions" on page 17 depending on the projector you are using. 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)

English

Positioning your projector

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Contents SP840 Digital Projector WelcomeTable of contents Important safety instructions English Do not block the ventilation holes Ceiling mounting the projector Introduction Projector featuresShipping contents Rear/lower side Projector exterior viewProjector Controls and functionsRemote control Operating the Laser pointer Replacing the remote control battery Remote control effective rangeChoosing a location Positioning your projectorObtaining a preferred projected image size English Length Average SP840 projection dimensionsTo connect the projector to a notebook or desktop computer Connecting a computer or monitorConnecting a computer ConnectionsWith a DVI input socket Connecting a monitorTo connect the projector to a monitor With a VGA cable With a VGA to DVI-A cableBetter video quality Connecting Video source devicesConnecting Audio Best video qualityHdmi cable Connecting Hdmi source devicesTo connect the projector to an Hdmi source device AV deviceAudio Cable Connecting Component Video source devicesTo connect the projector to a Component Video source device To connect the projector to an Audio source deviceConnecting S-Video source devices To connect the projector to an S-Video source deviceVideo Cable AV device Audio Cable Connecting Composite Video source devices To connect the projector to a composite Video source deviceAV device Video Cable Audio Cable Starting up the projector OperationSecuring the projector Using the menusUsing a security cable lock Use / to highlight the System Setup Basic menuAs pictured to the right, the four arrow keys Utilizing the password functionSetting a password If you forget the passwordEntering the password recall procedure Changing the passwordDisabling the password function Changing Color Space Switching input signalFine-tuning the image size and clarity Adjusting the projected imageAdjusting the projection angle Auto-adjusting the imageUsing Auto Keystone Correcting keystoneKeystone function Selecting the aspect ratio Magnifying and searching for detailsLetter Box About the aspect ratioOptimizing the image Selecting a picture modeSetting the User 1/User 2/User 3 mode Go to the Picture Basic Picture Mode menuFine-tuning the image quality in user modes Selecting a Gamma Selection Adjusting Clarity ControlSelecting a Color Temperature Selecting a Color Temperature UserFine TuningAdjusting Brilliant Color Selecting a White Peaking3D Color Management Selecting a Video Format Selecting Color Space ConversionSelecting a Film Mode Remote paging operationsSelecting a 3D Comb Filter Setting the Sleep Timer Locking control keysHiding the image Adjusting the sound Freezing the imageOperating in a high altitude environment Turning off the Power on/off Ring Tone Adjusting the sound levelAdjusting the Treble level Adjusting the Bass levelConfiguring the Lan Control Settings Controlling the projector through a Lan environmentIf you are in a Dhcp environment If you are in a non-DHCP environment Controlling the projector remotely through a web browserIiii Iiiv Shutting down the projector Personalizing the projector menu displayMenu system Menu operationAuto Power Off Adjustment Digital Zoom PC & ComponentYPbPr Tuning Menu SettingsBaud Rate Security SettingsSettings Reset All Settings Source Picture Mode ResolutionDescription of each menu Picture ModePicture Advanced Display menu System Setup Basic menu Hdmi Displays the number of hours the lamp has been used Shows the current signal sourceShows the selected mode in the Picture menu Shows the native resolution of the input signalCare of the projector MaintenanceGetting to know the lamp hour Setting Lamp mode as EconomicSetting Auto Power Off Lamp informationStatus Message Timing of replacing the lampReplacing the lamp Loosen the screws that secure the lamp Tighten the screws that secure the lamp Setup Advanced Lamp SettingsOff Green IndicatorsOff RedTroubleshooting Projector specifications SpecificationsDimensions Supported timing for Computer input Timing chartSupported timing for Component-YPbPr input Resolution Horizontal Vertical Pixel ModeSupported timing for Hdmi Hdcp input Supported timing for Video and S-Video inputsSXGA60 Disclaimer Warranty and Copyright informationLimited warranty CopyrightWeee directive Regulation statementsFCC statement EEC statementEnglish
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