1, turn on the computer, enter the desktop, and open the control panel at the "Start".
2. In the control panel, drag the scroll bar, find the "Display" item, and double-click to open it.
3. In the Display Properties window, select the Settings tab.
4. In the "Settings" interface, select the "Advanced" button.
5. In the window opened by "Plug and Play Monitor and ...", I saw that the original refresh rate was set to 60 Hz.
What we need to do is to change this "60 Hz" to "75 Hz", and finally press "OK" to set the screen refresh frequency.
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Hertz is also a frequency unit in the international system of units, and it is a unit to measure the number of repetitions of periodic changes per second. Hertz's name comes from the German physicist heinrich rudolf hertz. Its symbol is Hz. 1Hz = 1/s, that is, the number of times to complete the vibration in unit time, in hertz (1Hz = 1 times/second).
There are sometimes many frequency components in the electric signal carrying information; Mark the position of all these components on the frequency axis, and express the size of each component in terms of power or voltage, which is the "spectrum" of the signal. The frequency range it occupies is called the frequency band range of the signal. For example, in telephone communication, the frequency range of voice signal is 300 ~ 3400Hz；; In FM broadcasting, the frequency range of sound is 40 Hz ~ 15 kHz, and the frequency range of TV broadcast signal is 0 ~ 4.2 MHz.