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The difference between ordinary display and medical LCD monitor

- Aug 24, 2018 -

1. Support DICOM PART14 standard: A professional medical display must support the DICOM PART14 standard, which means that it must have the ability to adjust the DICOM standard curve to match the DICOM standard to ensure the image quality.

2. Size: The display size is expressed in terms of the diagonal length, usually in inches. The mainstream size of ordinary displays is 15", 17", 19"; the common sizes of medical displays are 18", 20", 21", and the size is basically similar to X film.

3. Support gray scale display: Gray scale is a very important feature of black and white medical images, which reflects the level between black and white images. Grayscale display requires graphics card support, medical dedicated display should be equipped with a dedicated graphics card; common display: 8bit-256 grayscale, used to display color images, no grayscale requirements, use ordinary graphics; medical display: 10 bit-1024 Gray scale, used to display X-ray grayscale images, relevant for diagnosis, requires: 10bit11bit (1024*2048 grayscale).

4, support SBC function (stable brightness control): the brightness of the display will decay with time, the ordinary display because there is no stable brightness control and calibration, not only the attenuation is faster, usually used, but also due to the influence of the environment The brightness can not be maintained at a suitable level for a team's human eye for a long time, and the professional medical gray scale display takes this problem into consideration, adopts a stable brightness control technology, and calibrates the information fed back by the display brightness at any time. Keep it above the standard brightness, in line with clinical reading standards.

5. Response time: The response time refers to the reaction speed of the liquid crystal display to the input signal, that is, the reaction time of the liquid crystal from turning on or turning from bright to dark. It is usually calculated in milliseconds (ms). The response is generally divided into two parts—Rising (Rise Time) and Falling (Descent Time), and our response time refers to the sum of the two. There is a phenomenon of "visual residue" in the human eye, that is, the moving picture will form a short impression in the human brain. The speed of the screen that people can accept is generally 24 frames per second, which is also the origin of the movie playing speed of 24 frames per second. If the display speed is lower than this standard, people will obviously feel the pause and discomfort of the picture. According to this standard calculation, the time required for each screen display needs to be less than 40ms. According to the actual use of the liquid crystal, the response time: 30ms (1/0.03=33.3 祯/sec), there will still be a tailing phenomenon, which is not suitable for dynamic medical imaging. Real-time playback. The response time is below 25ms (1/0.025=40祯/sec) to meet the real-time playback of clinical cardiovascular DSA. In the selection of medical displays, CR and DR static images do not require excessive response time. However, in the system configuration of playing dynamic images, such as cardiovascular machines and digital gastrointestinal machines, medical displays with a response time of less than 25 ms are preferred.

6. Certification: Common displays include: Environmental protection and electromagnetic related certification. For example, medical displays include: Not only environmental protection, electromagnetic related certification, but more importantly, medical industry certification, can enter the medical field and be recognized by law. Taiwan MOYOSUN Magic Word Medical LCD Monitor has: EU UL certification, China CCC certification.

7. Security: The common display has: There is no protection board for the LCD screen, and the power supply has no special requirements for the built-in mode. The medical display has: a protective plate specially equipped with a liquid crystal screen due to the requirements of teaching and the habit of the doctor, and a medical special power supply for the medical environment.

8. Contrast: Contrast is also called dynamic range. Contrast rate is a description of the difference between black and white in the display, and the ratio of the brightest value to the darkest value of the display. Color display does not require much, medical displays are required to express the degree of black and white between grayscale images. Ordinary displays are: 300:1~400:1; medical displays are: 600:1~1000:1; medical displays have a contrast ratio of up to 1000:1, which can display all the tones requiring a large ratio, generally choose contrast ≥600 it is good.

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