Christie Dlv1920 Dx User Manual
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Section 3: Operation 3-22 020-100001-01 Rev. 01 (04/07) • Select “ANAMORPHIC” to display an anamorphic image in its native 16:9 aspect ratio. The image will fill the screen from side-to-side and be centered between black bars at top and bottom. Size “Size” controls both the image width and height in tandem, maintaining the current aspect ratio (proportion) of the displayed signal data. Vertical Stretch “Vertical Stretch” adjusts the height of the image while keeping the width constant. Use “Vertical Stretch” to change the aspect ratio of the display. Pixel Track Steady flickering or several soft vertical stripes or bands across the entire image indicates poor pixel tracking. Proper pixel tracking helps ensure that the image quality is consistent across the screen, the aspect ratio is maintained, and that the pixel phase can be optimized (described below). Tracking determines the frequency of the pixel- sampling clock, indicated by the number of incoming pixels per line, so that all pixels generated by a particular source are sampled. NOTE: By default, the projector samples at the correct frequency for most sources. For best results, use a good test pattern such as a smooth gray consisting of a clear pattern of black and white pixels, or a similar “half on, half off” graphic image, such as the Windows shutdown screen. Adjust the slide bar until the vertical stripes broaden to the point where one large stripe fills the image. If the image still exhibits some shimmer or noise, adjust Pixel Phase (below). Pixel Phase NOTE: Adjust “Pixel Phase” after “Pixel Tracking”. Adjust pixel phase when the image (usually from an RGB source) still shows shimmer or “noise” after pixel tracking is optimized. Pixel phase adjusts the phase of the pixel- sampling clock relative to the incoming signal. For best results, use a good test pattern such as a smooth gray consisting of a clear pattern of black and white pixels, or a similar “half on, half off” graphic image, such as the Windows 2000 shutdown screen. Adjust the slide bar until the image stabilizes and each pixel is clearly defined. You may notice that you can stabilize the image at more than one point—i.e., you may find that the image appearance at “11” is identical to the image appearance at “38”, thus you can use either setting.
Section 3: Operation 020-100001-01 Rev. 01 (04/07) 3-23. If some shimmer from a video or HDTV source persists, use the “Filter” control to remove high-frequency noise from the signal. H-Position This option moves the image right or left within the area of available pixels. NOTE: The value shown represents where the approximate center of the image lies in relation to the total number of pixels available horizontally. This varies widely according to the signal—watch the image while adjusting. V-Position This option moves the image up or down within the area of available pixels. NOTE: The value shown represents where the approximate center of the image lies in relation to the total number of pixels available vertically. This varies widely according to the signal—watch the image while adjusting. Advanced Size and Position — SUBMENU This submenu consists of the following options: ACTIVE INPUT WINDOW: This read- only value indicates the current size (i.e., area) of your displayed data or “region of interest” as defined by the blanking controls. By default, the projector automatically determines what portion of its full resolution to use, and pixels in the surrounding borders are turned off. You can also specify a specific active input window size by adjusting one or more “Blank” settings. For example, if you have blanked (cropped) 100 pixels from both the left and right edges of an incoming source of 1400 x 1050, the remaining active input window will be reduced to 1200 x 1050. When using SD or HD or a decoded video source at INPUT 3 or INPUT 4, the default blanking of “0” defines an active input window of 720 x 483.
Section 3: Operation 3-24 020-100001-01 Rev. 01 (04/07) BLANKING (TOP, BOTTOM, LEFT, and RIGHT): Crop the image as desired so that unwanted edges are removed from the display (changed to black—see right). Blanking defines the size of the Active Input Window, or area of interest. Range of adjustment depends on the source resolution and other factors. After adjustment of blanking it may be necessary to perform a source switch. NOTE: Blanking a PIP image resembles zoom (see Figure 3.6). For example, left Blanking zooms the right side of the PIP image; Right Blanking zooms the left side. There are no black bars. Figure 3.6. Blanking of a PIP Image PLUG & DISPLAY (EDID): By default, a Plug & Play (EDID) source outputs a signal according to the EDID information provided by the projector. To override this information and display in a different format (for example, if your Plug & Play [EDID] device does not support the projector’s resolution and/or frequency), select the desired Plug & Play (EDID) resolution from the list. Any daisy-chained projectors will also display according to the chosen Plug & Play (EDID) format. EDID = Extended Display Identification Data standard. Blanking of a Primary Image
Section 3: Operation 020-100001-01 Rev. 01 (04/07) 3-25. Use options in the Image Settings menu to alter your main image without affecting its size or position. Changes made to the Image Settings menu are applied immediately and are saved when you exit the menu (press Exit or Menu). Options not available for the projector model or source are disabled and appear dim (gray). Contrast ( SHORT CUT: Press Contrast and adjust the slide bar.) “Contrast” increases or decreases the perceived difference between light and dark areas of your image (0-100). For best results, keep close to 50. If contrast is set too high, the light parts of the image lose detail and clarity. If the contrast is set too low, the light areas will not be as bright as they could be and the overall image will be dim. For best results, start with a low value and increase so that whites remain bright but are not distorted or tinted, and that light areas do not become white (i.e., are “crushed”). NOTE: If the environment lighting changes, an adjustment of Gamma is recommended (see below). Brightness ( SHORT CUT: Press Bright and adjust the slide bar.) “Brightness” increases or decreases the amount of black in the image (0-100). For best results, keep close to 50. Start with a high value and decrease so that dark areas do not become black (i.e., are “crushed”). Conversely, high brightness changes black to dark gray, causing washed-out images. Gamma ( SHORT CUT: Press Gamma and adjust the slide bar.) “Gamma” is a global setting that determines what gray shades are displayed between minimum input (black) and maximum input (white) for all signals. A good gamma setting helps to optimize blacks and whites while ensuring smooth transitions for the “in-between” values utilized in other colors. Thus, unlike “Brightness” and “Contrast” controls, the overall tone of your images can be lightened or darkened without changing the extremes, and all images will be more vibrant while still showing good detail in dark areas. Gamma is used to fine-tune the gamma table currently in use, ranging from 1 – 3 (2.2 = default). If excess ambient light washes out the image and it becomes difficult or impossible to see details in dark areas, lower the gamma setting to compensate. This will improve contrast while maintaining good details for blacks. Conversely, if the image is washed out and unnatural, with excessive detail in black areas, increase the Ima ge Settings Menu f
Section 3: Operation 3-26 020-100001-01 Rev. 01 (04/07) setting. In high ambient light conditions, lower gamma may produce better results than higher gamma. Gamma of 2.2 (default) indicates the gamma table has not been adjusted. For more information, refer to Advanced Image Settings submenu, Gamma Table. Again, good gamma improves contrast while maintaining good details for blacks. Filter The proper filter setting is automatically set for virtually all signals, and rarely needs to be changed. It applies a low pass filter for noise reduction in the incoming input signal, particularly for HDTV or SDTV. Applied in the analog domain before sampling, this filtering removes high frequencies and thus reduces pixel phase noise (note this also reduces signal bandwidth). Override only if standard pixel tracking and phase adjustments do not adequately clear up a “noisy” video signal, or if a graphics signal appears overly “soft”. Both instances indicate that “Filter” may be set to the wrong option. Detail “Detail” adjusts the sharpness of a video image so that edges remain clearly defined. It can be particularly useful if a significant “Noise Reduction” adjustment has caused the image to appear too soft. Adjust until the display is as sharp as desired, keeping in mind that because “Detail” adds some high frequencies back into the image, it can also re-introduce a certain degree of noise. Noise Reduction “Noise Reduction” is similar to the “Filter” control, but operates in the post-sampling digital domain with a more subtle effect. Higher settings are most useful for clearing up noisy RGB images such as those from a PC. Adjust as desired, keeping in mind that reducing noise (which reduces high frequencies) may also soften the image. Color Space “Color Space” determines how the color components of an analog input signal are decoded for accurate color in the display. Selecting a color space option is useful only for analog signals and certain digital sources connected to INPUT 1, INPUT 2, INPUT 5 or INPUT 6. Although color space for these analog signals is automatically determined by the projector, in some circumstances you may wish to override this and manually set a specific color space. NOTE: For many digital signals or for signals connected to INPUT 3 or INPUT 4, the color space function is entirely automatic and the pull-down list disabled. The current color space appears in the Image Settings menu. Press to select a different option: • Select RGB unless you are using component video at INPUT 1, 2, 5 or 6. • Select YPbPr (Video) with a standard definition televised signal (SDTV). • Select YPbPr (HDTV) with a high definition televised signal (HDTV).
Section 3: Operation 020-100001-01 Rev. 01 (04/07) 3-27. NOTE: When certain RGB signals are first connected, the projector may not initially recognize them as RGB and will incorrectly decode their color information as YPbPr (video). These signals can include: • RGB signals in NTSC, PAL, SECAM frequency ranges. • Scan-doubled sync-on-green. • Scan-quadrupled sync-on-green. For these signals, change the Color Space to RGB, and then define a new channel for future use. Video Options — SUBMENU This submenu is used with video sources only ( INPUTS 3 or 4). ENABLE DECODER AGC: Automatic Gain Control (AGC) affects decoded video images only. Enter a checkmark (default) in most instances—this activates the decoder’s AGC circuit to ensure properly bright images. Delete the checkmark if a decoded video image exhibits strange color artifacts such as stripes in highly saturated colors, indicating an incompatibility between this source and the AGC. VIDEO STANDARD: For all but the more unusual video standards available in the world, the projector automatically detects the incoming horizontal and vertical frequencies and sets the projector’s processing of this signal to the corresponding standard. The current video standard name appears in the Video Options submenu, and includes an “A” if it has been auto-detected. Press to view or select a different video standard from those available to the projector—any that are disabled have frequency characteristics that differ from those of the incoming signal. Selecting a specific standard forces the projector to process the signal according to this standard. NOTE: Best results are obtained with defined channels. Otherwise, switching from one video source to another can sometimes cause slight disturbances in the display, indicating that the Auto function is struggling. Recover by briefly selecting a different video standard, then going back. Table 3.3. Regions and Video Standards: Summary StandardWhere Used (SUBJECT-TO-CHANGE) NTSC N. America and Japan NTSC 4.43 A tape-only standard for partially-translated hybrid signals PAL Most of Europe, China, Australia, some of S. America, some of Africa PAL-M Brazil PAL-NC Argentina, Chile, other Latin American countries PAL 60 SECAM France, Eastern Europe, most of Africa
Section 3: Operation 3-28 020-100001-01 Rev. 01 (04/07) NOTE: Generally, use “Auto” for all instances EXCEPT: 1) a poor quality input signal or 2) a black-and-white video signal. In order to detect and display such signals, select the relevant standard from the list. INPUT VIDEO BLACK: This control compensates for incoming elevated black levels present in certain video signals, and ensures that blacks in the display are neither crushed (i.e., where dark grays appear black) nor excessively elevated (i.e., where blacks appear dark gray). By default, the projector automatically determines the best setting according to the type of incoming video signal: • 0 IRE – Used for DVD output with “enhanced black”, SECAM, most PAL standards, and Japanese NTSC. • 7.5 IRE – Used for most NTSC video signals. For some types of video, you can override the setting. The control is disabled for other types of video (and all graphics sources). Generally, if black appears crushed when brightness = 50, choose “0 IRE”. If black appears excessively elevated, use “7.5 IRE”. COLOR: This slide bar adjusts the color saturation level, i.e., the amount of color in a video image. Lower settings produce less saturated colors — for example a setting of “0” produces a black and white image. If the color level is too high, colors will be overpowering and unrealistic. TINT: This slide bar adjusts the red/green color hue for true color reproduction of video and HDTV signals connected to Input 3 or 4. For best results, adjust tint while displaying an external test pattern—otherwise, it is recommended that tint remain at its default setting. DECODER LUMA DELAY: This control affects any incoming composite or S-video signal, delaying the luma signal (intensity) in relation to the chroma (color). In the image, increasing the luma delay will move luma (seen as a shadow where colors overlap) to the right slightly, with colors remaining in place. Decreasing this delay will move the shadow slightly to the left. If necessary for your current source, adjust so that no shadows occur with adjacent colors. Input Levels — SUBMENU NOTES: 1) Because the projector automatically optimizes input levels for all but the most unusual of sources, it is recommended that only experienced users use the Input Levels submenu. 2) Before beginning, check that overall contrast and brightness settings are near 50 and that color temperature is properly set up on an internal grayscale test pattern. 3) There must be at least two consecutive white pixels present in the image for proper “Auto Input Level” function. Leave this control off after use.
Section 3: Operation 020-100001-01 Rev. 01 (04/07) 3-29. Good RGB or input levels— that is, the drives and black levels for each of the three colors, red, green and blue— ensure that images from analog sources other than decoded video have maximum contrast without crushing black or white. By default (and in an “Auto Setup”), the projector automatically determines the best input levels by monitoring image content and adjusting the controls appropriately—further adjustment is typically not required to obtain proper blacks or whites. NOTE: This automatic adjustment requires at least 6-12 consecutive white pixels in the image. Without these pixels, input levels may produce skewed colors, particularly in non-video images. However, for a very unusual source exhibiting one or more overly high black levels (typically caused by a noisy source causing black level spikes), an experienced user may prefer to use the Input Levels menu (shown above). These adjustments, which together serve as a calibration process compensating for differences in sources and cabling, enable an experienced user to perfect the source image input levels and eliminate the “overshoot” and “undershoot”. Note that Input Levels are of limited use with digital signals, but do offer some ability to tweak poorly mastered source materials. NOTES: 1) Input levels apply for the current source only, but for any color temperature used. 2) Assuming that color temperature has been set up based on the internal test patterns, you can then set up input levels for a given source so that it matches the color temperature of the internal test patterns. AUTO INPUT LEVEL – Temporarily enter a checkmark only if you are an experienced user and you have an unusual source that you feel needs further color temperature and/or input level adjustment. This compensates for incoming out-of-range drives (white) and black levels (black) that would cause “crushing” of light and dark colors in the image. After entering a checkmark, wait for the six slide bar values to stabilize, then delete the checkmark and exit. The Auto Input Level is automatically turned off upon exit from the Input levels Menu. BLACK LEVELS AND DRIVES - To check your image levels and adjust these controls: 1. Ensure overall “Contrast” and “Brightness” settings are both set to near 50. NOTE: Not required for “Auto” adjustment. • Contrast= 50 (approx.) • Bright= 50 (approx.) 2. Check the color temperature setup using an internal grayscale test pattern, making sure to obtain a neutral grayscale. NOTE: Not required for “Auto” adjustment.
Section 3: Operation 3-30 020-100001-01 Rev. 01 (04/07) 3. Confirm that you are using an analog source not connected to INPUT 3 or INPUT 4, as Input Levels are not applicable for digital sources or sources going through the decoder. A grayscale is recommended. 4. If the blacks and/or whites appear OK, input levels do not need adjustment. If black levels are too high (and/or whites are too low, which is rare), you likely have a noisy source that is producing skewed input levels. Continue with Step 5. 5. Temporarily enable “Auto” in the Input Levels submenu. Wait for all six values to stabilize. Alternatively, do not use “Auto”—reduce black levels manually instead. Judge by eye and change one or more of the six levels as necessary to obtain proper blacks and whites. You may want to see only a certain color while adjusting—use the “Color Enable” option (described below). 6. Delete the “Auto” checkmark and leave the Input Levels menu. IMPORTANT: Do not use Input Levels to adjust color temperature. This will distort Contrast and Brightness functions as well as color temperature. AUTO COLOR ENABLE – When a checkmark is present, selecting a specific black level or drive to adjust will automatically enable the corresponding color in the display. Delete the checkmark to see all colors, or to enable a different specific color through the Color Enable Control. CLAMP LOCATION – This option (formerly known as sync tip clamping) can brighten the image produced from certain high- resolution high-frequency graphic sources. The projector automatically selects the best clamp location for almost all sources. Use the normal Back Porch location if the image is either sufficiently bright or overly bright. Select Sync Tip if the image appears unusually dim, if there are horizontal streaks across the image, or if there is significant color drift. This moves the clamping pulse from the normal back porch location (which is likely too short) to the tip of the horizontal sync pulse. Tri Level is typically needed for an HDTV source. COLOR ENABLE –Select which color or colors you want to see in the display, useful while working with color temperature white levels or input levels. NOTES: 1) Input levels apply for the current source only, but for any color temperature used. 2) Assuming that color temperature has been set up based on the internal test patterns, you can then set up input levels for a given source so that it matches the color temperature of the internal test patterns. PEAK DETECTOR – The Peak Detector is a tool to assist with defining individual input levels, enabling you to accurately set the Input Levels for any particular source with the appropriate image. Enabling the Peak Detector activates a special operating mode for detecting only pixels that are considered black or white—all other levels are displayed as a mid-level gray. When used with a smooth grayscale pattern in which black and white are known to be at opposite edges of the image, you can watch these isolated areas while adjusting individual black levels and input drives until both black and white edges are just visible and distinguished from neighboring pixels. Images from this source will then display correct blacks and whites without crushing. See Figure 3.7. Adjusting Input Levels Using the Peak Detector :
Section 3: Operation 020-100001-01 Rev. 01 (04/07) 3-31. 1. Display a 16 level grayscale test pattern from the desired external source, and enter a checkmark in the Peak Detector checkbox. NOTE: The “Peak Detector” will initially render the grayscale as a uniform gray field before adjustment or extreme crushing. 2. Display one primary color. NOTE: Selecting Auto Color Enable ensures the correct color is displayed for each setting. 3. For the current color, adjust its corresponding “Black level” slide bar just until a single band of black appears at one edge of the screen. This band represents the first band of the grayscale pattern, which should be 100% black. Do not adjust too far. 4. With the same color still active, adjust its corresponding “Input Drive” slide bar just until a single band of color appears at the opposite edge of the screen. This band represents the last band of the grayscale pattern, which should be 100% white (or the current color, if a certain color is enabled). Do not adjust too far. 5. It may be advantageous to go back and check the black band—adjust the black level slide bar if necessary. NOTE: Readjusting the black levels affects the gain at this point; only readjust when absolutely necessary. 6. Repeat Steps 3-5 with the other two remaining primary colors. When each primary color shows one optimized black band and white (or colored) band, the input levels for this source are correctly set. Upon exiting the Input Levels menu, the Peak Detector checkbox will clear. Figure 3.7. Adjusting Input Levels Using the Peak Detector (RED EXAMPLE SHOWN)