How much is the swimming coach?

1. Liquid crystal is an almost transparent substance, and the path of light passing through liquid crystal is determined by the arrangement of its molecules, which is a characteristic of solids. Charging the liquid crystal will change its molecular arrangement, which will cause the light to be distorted or blocked.

2. The stopwatch used in the school sports meeting, the display interface is LCD screen, and the notable features of LCD screen are saving electricity and optimizing the display screen of battery-powered equipment.

There are many kinds of LCD screens. TN is a twisted article type, and it is also a basic model with low price. IPS wide viewing angle screen is not so high-end and the price is relatively expensive.

4. Is the common circuit driven by IC? For example, 162 1 is used to drive liquid crystals. Because LCD and LED screens are driven in different ways, they cannot be lit simply by applying voltage to their pins, and they need to be driven alternately by positive and negative waveforms.

5. In order to save the driving cost, a simple LCD screen, that is, a screen with only a few points or a dozen points, is directly driven by the analog waveform of the IO port of the single chip microcomputer, which has low cost and stable performance.

6. We should also pay attention to the selection process. In some places, cold and low temperature will lead to abnormal use of LCD, or need high-definition display. It is necessary to add a backlight or use an LED screen.