A monitor or display is an electronic visual display for computers. The monitor comprises the display device, circuitry, and an enclosure. The display device in modern monitors is typically a thin film transistor liquid crystal display (TFT-LCD), while older monitors use a cathode ray tube (CRT).
The size of an approximately rectangular display is usually given as the distance between two opposite screen corners, that is, the diagonal of the rectangle. One problem with this method is that it does take into account the fact that when a rectangle with a given length to its diagonal, becomes more rectangular, and less square (its aspect ratio increases), and at the same time its diagonal remains the same, then the area of the rectangle decreases. That is, given the same diagonal, the area of the display decreases if its aspect ratios increases. For example, a 4:3 21 in (53 cm) monitor has an area of about 211 sq in (1,360 cm2), while a 16:9 21-inch widescreen has about 188 sq in (1,210 cm2).
This method of measurement is inherited from the method used for the first generation of CRT television, when picture tubes with circular faces were in common use. Being circular, only their diameter was needed to describe their size. Since these circular tubes were used to display rectangular images, the diagonal measurement of the rectangle was equivalent to the diameter of the tube's face. This method continued even when cathode ray tubes were manufactured as rounded rectangles.
Another problematic practice was using the size of a monitor's imaging element, rather than the size of its viewable image, when describing its size in publicity and advertising materials. Especially on CRT displays, a substantial portion of the imaging element is concealed behind the case's bezel or shroud in order to hide areas outside the monitor's safe area due to overscan. These practices were seen as deceptive, and widespread consumer objection and lawsuits eventually forced most manufacturers to instead measure viewable size.
Since manufacturers such as Sony and Panasonic discontinued CRT production, all major medical equipment suppliers now provide flat screen LCD monitors with their endoscopic systems. The LCD monitor is now the modern standard for medical stacks, outperforming both CRT and Plasma monitors.
Most popular suppliers: Sony and Panasonic
with full 1920 x 1080 HD resolution has been designed for endoscopic, surgical reference and educational applications. The new 32" display supersedes the current top-of-the-line LMD-2450MD 24-inch model with an expanded viewing area and a range of additional advanced features. The new display offers a much increased available screen size and a host of advanced features offering surgeons the highest quality visual peripherals. Providing enhanced side-by-side image display, the HD LCD supports simultaneous viewing of multiple modalities and maximises use of the available screen to significantly expand the size of the image. Similarly, the picture-in-picture mode delivers larger inset images with enhanced use of space. Additionally, in dual monitor configurations, an innovative mirror image feature inverts the image display on one of the monitors to present clinicians with an image orientation consistent with their view of the surgical field wherever they are situated. These monitors have 10-bit signal processing and Sony ChromaTRU™ colour management technology for high detail, brightness and colour accuracy. Designed for easy integration and operation in surgical environments, the 32-inch LMD-3250MD is compatible with a full range of surgical mountings and features a front bezel control panel with touch-sensitive backlighting.
Panasonic EJ-MLA32U-W 32" Class Full HD Widescreen Medical Monitor
- Designed and certified for medical operating room environment
- User selectable picture-in-picture or picture-out-of-picture
- Side-by-side display of 2 HD images; independent adjustment of each
- Three simultaneous screen display possible, such as surgical image, vital signs, etc.
- Multiple HD inputs are standard, no need to purchase optional input board(s)
In-Plane-Switching Technology (IPS-Pro)
The new Panasonic medical displays implement the latest evolution of In-Plane-Switching technology, IPS-Pro, which provides excellent colour images with a very high contrast ratio from almost all viewing angles.
Medical imaging applications require highly consistent performance and accurate image reproduction. IPS-Pro substantially improves viewing angle, brightness, contrast, black levels and switching speed, producing the best solution on the market for multi-modality medical imaging.
When viewed from a wide angle, a monitor with non IPS-Pro display will exhibit a poor contrast and inaccurate colorimetry. In a non-medical environment, this performance limitation is not critical, but in medical imaging systems, color accuracy is vital and aids medical professionals during surgery. IPS-Pro TFT technology defeats the restrictions of conventional LCD display technology in terms of wide viewing angle, contrast ratio, brightness, and color accuracy.
Compiled and edited by John Sandham