Barco MGD 2621 Appendix a Background Information, Clamping Luminance Uniformity Correction

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APPENDIX A:

BACKGROUND INFORMATION

Clamping

Luminance Uniformity Correction

Inside the display, the video signal from the video input is connected to the video amplifier. This circuit amplifies the signal, paying special attention to two signal levels: the amplitude and the dc-level. The dc-level of the video signal in the video amplifier determines the eventual black level of the image on the picture tube (CRT).

The circuits of the video amplifier can pick up interferences from different ambient sources. These interferences can change the dc-level of the video signal. In the end, the black level of the image on the CRT will be incorrect and unstable.

This is avoided by special clamping circuits inside the video amplifier. They clamp a particular part of the video signal to a constant dc-voltage. In this way, the video dc-level and thus the image black level is kept constant.

In a color display, clamping is normally done on the backporch. This is the part of the video signal that follows the sync pulse. But if the video signal's backporch is too small for clamping, another part of the signal has to be chosen. In that case, sync tip clamping has to be selected.

In the MGD 2621 P, clampig is best (and default) done on the sync tip.

A characteristic (or limitation) of every picture tube (CRT) is that the luminance decreases towards the edge of the screen surface. The decrease is normally 20 to 30 %.

This is caused by the shape of the picture tube. Inside the CRT, a so-called electron gun shoots an electron beam towards the front (the glass panel). Because this panel is rather flat instead of having a spheric shape, the electron beam has to 'travel' a longer distance in the corners than in the center. So the intensity is higher in the center.

This phenomenon is even increased by the irregular distribution of the phosphor and aluminium layer on the glass panel. These tend to

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Contents MGD 2621 P Medical Greyscale Display Page Safety Instructions Contents Overview IntroductionAbout the manuals Calibration and adjustments Power saving systemPrecautions Package contents InstallationUnpacking the display Power connection Location of controls ConnectorsConnection of video signals Connection of data signals Connection of an optical sensor Important considerations Operation User Controls How to switch on the displayHow to use LUC Advised setting for contrast and brightnessOn-screen menu system Advanced Adjustments for Service Staff onlyTo exit the menu system Word about the memory systemFocus Geometry SH Comp. Top SH Comp. Bottom InfoLight Luma equalizing Miscellaneous Mode selection Menu exit Cabinet MaintenancePicture tube On the picture tube appears the message No Valid Sync Signal TroubleshootingClamping Luminance Uniformity Correction Appendix a Background InformationBe thicker in the center Picture tube Appendix B Technical SpecificationsMGD 2621 P Users Guide B410030/Rev February

MGD 2621 specifications

The Barco MGD 2621 is a high-performance medical display solution engineered to meet the rigorous demands of healthcare environments. This advanced monitor is part of Barco's commitment to enhancing clinical workflow, ensuring precise diagnosis, and elevating patient care through superior imaging technology.

One of the standout features of the MGD 2621 is its remarkable display clarity. With a resolution of 2560 x 1600 pixels, this display provides stunning image detail, crucial for diagnostic processes that depend on the visibility of minute anatomical structures. The high pixel density ensures that images are crisp and clear, resulting in accurate assessments by medical professionals.

Color accuracy is another hallmark of the Barco MGD 2621. The monitor boasts a wide color gamut, facilitating true-to-life color reproduction. This feature is particularly vital in areas such as radiology and pathology, where distinguishing between subtle color differences can influence diagnosis and treatment plans.

The Barco MGD 2621 utilizes advanced DICOM conformance to faithfully reproduce medical images with consistent luminance and contrast. This adherence to DICOM standards ensures that images meet the required specifications for clinical use, facilitating reliable comparisons and evaluations.

In terms of ergonomics, the MGD 2621 is designed for optimal usability in fast-paced environments. It features flexible mounting options that allow healthcare professionals to position the monitor at heights and angles that best suit their needs. Additionally, the monitor's anti-glare glass front provides enhanced visibility under various lighting conditions, further improving the user experience.

Barco has integrated its proprietary calibration technology into the MGD 2621, ensuring that the display maintains consistent performance over time. Automatic calibration and built-in quality assurance features provide peace of mind for users, knowing that images will retain their integrity throughout their use.

Furthermore, connectivity is seamlessly addressed in the Barco MGD 2621. The monitor supports various input formats, including dual-link DVI and DisplayPort, ensuring compatibility with a wide range of imaging systems. This versatility allows for an efficient integration into existing medical infrastructure.

In summary, the Barco MGD 2621 is an exemplary choice for medical professionals requiring a reliable, high-quality display solution. Its combination of superior image clarity, color accuracy, ergonomic design, and robust connectivity makes it a pivotal tool in the pursuit of excellence in medical imaging and patient care. Healthcare institutions investing in the MGD 2621 are not just enhancing their diagnostic capabilities but are also committing to providing the highest quality of care for their patients.
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