Electronic class board is a kind of electronic class board installed at the door of the classroom, which is used to display school notices and class notices in real time. It can establish centralized and distributed management and freely control each terminal. Displays the comprehensive basic information of the class, including weather, class name, courses, duty table, etc.

Monitor: Also called monitor. A monitor is an I/O device belonging to a computer, that is, an input/output device. It is a display tool, which displays some electronic files on the screen through a specific transmission device and then reflects them to human eyes.

Electronic class card is also a kind of LCD.

Advantages of LCD:

1) Low voltage, micro power consumption

The working voltage is very low, only 2V~3V can work, and the working current is only a few microamperes, that is, each displayed character is only a few microamperes. A small button cell can last 1~2 years, which is unmatched by any other display device. In terms of operating voltage and power consumption, liquid crystal display just adapts to the development of large-scale integrated circuits. Such as electronic watches, calculators, portable instruments, portable computers and GPS electronic maps, are all possible.

2) Low voltage drive

Generally, the threshold voltage of twisted nematic (TN) devices is only 1.5~2V, which can directly match large-scale integrated circuits.

3) horizontal organization

The basic structure of a liquid crystal display device is a thin box made of two glass substrates. This structure is most suitable as a display window, which can accommodate the largest amount of display content in a limited area and has the highest utilization rate of display content. In addition, this structure can be made not only very small, such as the display window used in cameras, but also very large, such as large-screen LCD TVs and large LCD billboards.

This structure is also convenient for large-scale and automatic production. At present, the production of liquid crystal display devices mostly adopts automatic and semi-automatic integration technology, and only a few workers can start a production line with an annual output of thousands of pieces.

At present, liquid crystal display devices made of plastic substrates have been developed. This kind of equipment is as thin as paper and flexible, thus further reducing the use space.

References:

LCD Baidu Encyclopedia