What is the screen refresh rate

In the days of monitors and TVs, established on the basis of a CRT (cathode ray tube), each person should at least have a General idea of what the screen refresh rate. Unless, of course, it was important for him to keep

Vision, not experience headache and accompanying discomfort when working at the computer or viewing TV programs. We can say that the screen refresh rate was indirectly associated with health. In our time the situation has abrasonis. Devices have been created to display graphical information using completely different principles of operation than CRT technology. Although the LCD screen on TV and monitors are not so perfect to speak about full safety: the impact on vision is greatly decreased but not completely disappeared.

To Answer the question, what is the refresh rate of the screen, the easiest way for the owners of computer displays. In the case of using Windows operating system to the latest versions, you need to any place on the desktop to bring up the menu by pressing the right mouse button and from the list that appears, select "screen Resolution". Next, you need to follow in “more settings”. Here, tab “Monitor”, you can see the string “astate screen refresh”.

In modern monitors based on liquid crystals, are usually made available a 59 or 60 Hz – for low-end models; the more expensive you can put also 75 and 100 Hz. The refresh rate of the LCD screen – this is the legacy of the era of CRT. In liquid crystal models “eye” to distinguish between 60 and 100 Hz impossible. The only thing now is affected by this parameter – smoothness of movement of the cursor of the mouse and 3D glasses (100 Hz is needed for them).

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But in the days of CRT it was different. The inner surface of the screen (tube) was covered with a layer of a special substance (phosphor) is capable of a few milliseconds to light up after hitting him electrons. Three electrode (the gun) through the issue of the radiated streams of particles, whose motions are adjusted by the magnetic field. Reject rays from a straight line to first began to glow the upper left corner of the screen, then the flow was caused to glow by the horizontal straight line

The top right corner. Next, the beam is shifted down one line and everything is repeated. When reaching the bottom right corner he went back to the beginning and it was repeated. The number of such rendered per second screens is the refresh rate.

The LCD controller is able to selectively change the passage of light through the elements of the matrix liquid crystals – can simultaneously ignite or extinguish the screen. The flickering of the lights – this last drawback, which is actively eliminated in the new models of monitors. The phosphor on the screen still glowed, creating the illusion of a coherent image. Eyes just do not have time to notice the flickering caused by the constant updating of the picture. However, it was present, and at refresh rates below 75 Hz was noticeable by the peripheral vision. To remedy this, manufacturers offered the monitors with a frequency above 120 Hz. Of course, this scheme is simplified for understanding – we do not consider the formation of the colors and the image.