Extron electronic IN1508 manual CRT displays selecting the optimum resolution

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The ideal resolution must lie within the compatible range of the display. For example, some 27” to 36” presentation monitors are limited to input signals in the 30 kHz to 50 kHz range. Check the Direct View Display Cross Reference and the Projector Cross Reference on the Extron Web site (www.extron.com) for the most up-to-date compatible ranges of most displays.

CRT displays — selecting the optimum resolution

While CRT displays do not have a native resolution, they do have a “sweet spot“ for input signal resolution. When the switcher is set to output at the sweet spot of the CRT, it results in a detailed image with no visible scan lines. If the switcher is set to output below the sweet spot, the displayed image has small scan lines between the image lines. If the switcher is set to output above the sweet spot, the image’s lines overlap and the image loses detail because there are more lines and pixels than the display can clearly resolve. When experimenting to find the sweet spot, start with the output refresh rate set at 75 Hz and the resolution shown in the table on the next page. Then, with a critical eye, try lower resolutions until you achieve a solid image with optimum image detail.

CRT displays — selecting the optimum refresh rate

CRTs tend to flicker at refresh rates below 70 Hz. To achieve a flicker-free image, try an output refresh rate of 75 Hz.

Note that as the refresh rate increases, the horizontal scan rate also increases, placing greater bandwidth demands on the video distribution system and the display. If the bandwidth is too high, you may see a softer image because the signal exceeds the bandwidth of the distribution system and the display. An extremely high refresh rate can also create a compatibility problem in which the video signal is beyond the scan rate of the display.

Fixed pixel displays — selecting the optimum resolution and refresh rate

Display devices that are based on LCD, DLP, D-ILA, and plasma technology have a specific number of pixels, a native resolution. These displays typically can show higher or lower resolution signals, but can do so only by scaling the image up or down to the native resolution. To avoid additional image scaling by the display (and more processing is inherently bad for image quality), it is important to know your display’s native resolution.

Check the display’s operation manual to determine its native resolution. Set the switcher to match this native resolution. The switcher’s refresh rate should be set to 60 Hz for most LCD, plasma, D-ILA, and DLP projectors.

Higher refresh rates are not recommended for these display technologies. They usually do not improve the image and may cause compatibility problems.

IN1508 Scaling Presentation Switcher • Operation 3-31

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Contents IN1508 Precautions FCC Class a Notice Quick Start IN1508 Scaling Presentation Switcher Front Panel Controls Table of Contents Table of Contents, cont’d IN1508 Scaling Presentation Switcher Table of Contents Iii Iv IN1508 Scaling Presentation Switcher Table of Contents One Introductiontroduction, cont’d IN1508 Scaling Presentation Switcher Introduction DVI videoFeatures Standard DVI cableIN9700 cable IN1508 Scaling Presentation Switcher Introduction Introduction, cont’d IN1508 Scaling Presentation Switcher Introduction Introduction, cont’d Two Mounting the Switcher Tabletop useRack mounting Power connection Cabling and Rear Panel ViewsVideo connections Installation, cont’d Audio connectionsRemote Control Battery Installation ConfigurationRS-232 connection Installation, cont’d Three Front Panel Controls and Indicators IN1508 Scaling Presentation Switcher OperationInfrared sensor Input controls Input selection buttons and LEDsOperation, cont’d Output Rate selectionPicture-in-Picture controls PIP buttonsPicture Controls buttons Menu control buttonsPicture-In-Picture PIP buttons The PIP Remote Control ButtonsDesired buttons on the remote. The maximum Input Selection buttons The Input SelectionOperation, cont’d Power OperationsPicture-in-picture mode operation 10 IN1508 Scaling Presentation Switcher OperationInput selection operation PIP mode input selection and swap operations 12 IN1508 Scaling Presentation Switcher Operation Menu system operationSelection boxes and status indicator bars ButtonsStatus indicator bar control 14 IN1508 Scaling Presentation Switcher OperationSelection box control For menu system operation For picture control button operation16 IN1508 Scaling Presentation Switcher Operation Main menu systemInput submenu Zoom selection Center selectionSize selection Pan selectionOperation, cont’d Color status indicator bar Brightness status indicator barContrast status indicator bar Tint status indicator bar20 IN1508 Scaling Presentation Switcher Operation Output submenuResolution selection box Refresh Rate selection boxSync Polarity selection box Input Gain/Attenuation status indicator bar Signal Type selection boxOutput Volume status indicator bar 22 IN1508 Scaling Presentation Switcher OperationFreeze selection box Audio Delay selection boxAdvanced submenu Blank selection boxBlue Mode selection box PIP Mode selection boxFade Switch selection box Reset selection boxPerforming a system reset from the front panel Picture adjustments26 IN1508 Scaling Presentation Switcher Operation Press again20 Picture adjustments flowchart, IR remote control buttons 28 IN1508 Scaling Presentation Switcher Operation Sharpness status indicator bar, on 30 IN1508 Scaling Presentation Switcher Operation Setting up a DVD sourceResolution and refresh rates Optimizing the VideoCRT displays selecting the optimum resolution CRT displays selecting the optimum refresh rate32 IN1508 Scaling Presentation Switcher Operation CRT DisplaysInput submenu’s Advanced selections 22 Input submenu’s Advanced selections23 Advanced input settings 34 IN1508 Scaling Presentation Switcher OperationHorizontal Start and Vertical Start status indicator bars 24 Incorrectly started imageActive Pixels and Active Lines status indicator bars 36 IN1508 Scaling Presentation Switcher OperationHorizontal rate = 31.5 kHz, vertical rate 60 Hz Total Pixels status indicator bar Phase status indicator bar38 IN1508 Scaling Presentation Switcher Operation Troubleshooting Optimizing the AudioGeneral checks Specific problems 40 IN1508 Scaling Presentation Switcher OperationImage is stretched Active lines may be HorizontallyCompressed Vertically42 IN1508 Scaling Presentation Switcher Operation Setting cannot be Problem Possible cause Solution Total pixels settingActive lines setting Horizontal start44 IN1508 Scaling Presentation Switcher Operation Four Switcher Error Responses Host-to-Switcher InstructionsSwitcher-Initiated Messages IN1508 Scaling Presentation Switcher Serial CommunicationsUsing the Command/Response Table Symbol definitionsCommand/response table for SIS commands Command Ascii Command Response Additional descriptionCommand/response table for SIS commands cont’d Zoom Audio mute Command/response table for special function SIS commands Command/Response Table for Special Function SIS CommandsInput aspect ratio DVI auto-detect DVI input 8 only AAppendix a Specifications and Part Numbers SpecificationsAudio Suggested adapters Part NumbersIncluded parts CablesHigh performance DVI cables Cable Part number Specifications and Part Numbers, cont’d Extron’s Warranty Asia JapanExtron Electronics, Europe Beeldschermweg 6C
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