The composition and working principle of a digital display

The lifespan of a typical LCD digital display is 50,000 hours. Others Don't know.

How does an LCD monitor work? Scientists will take you to reveal how LCD monitors work!

The working principle of liquid crystal display is as follows: under the action of electric field, the arrangement direction of liquid crystal molecules is used to change the transmittance of the external light source (modulation), and the electric light conversion is completed, and then the different excitations of R, G and B primary color signals are used to complete the color reproduction in the time domain and space domain through the red, green and blue primary color filter films.

The LCD display is characterized by a thin body, space-saving, compared with the bulky CRT display, the LCD only needs one-third of the former's space; It is a low-power consumption product, and it can be completely free of heat compared to CRT displays; No radiation, which is conducive to physical health, and the LCD display is completely radiation-free; The picture is soft and does not hurt the eyes.

How does an LCD monitor work? Scientists will take you to reveal how LCD monitors work!

Learn how LCD monitors work.

Let's break down the picture into pixels, and then restore it.

Liquid crystal displays and plasma displays work in a similar way, controlling the small pixels on the screen one by one to assemble the entire picture, while the rear projection is similar to a cathode ray tube display.

Now there is also the latest e-ink display, which does not need to be powered on all the time when it is used, and only consumes a small amount of power when the image is changed, but now it is only in the experimental stage, and there are only prototype electronic watches, e-book readers, etc.

Yes, neither the rear projection display nor the cathode ray tube display can be controlled by the small pixels on the screen, and the e-ink uses voltage to control a small area one by one.

I don't know what you're looking for this for?

1. Let's talk about the signal first. The signal is sent from the host, through the driver board of the display, to the circuit board of the display, how to convert the specific signal, not to mention, all returned to the teacher. The circuit board is connected to an LCD screen, on which an image is displayed.

2. You can't see the display image mentioned above. Because it is only displayed on a piece of black translucent glass. There must be a light source on the back.

Therefore, the display has a 220V power supply, 220V enters the display power board, and the power board transforms into 12V and 5V DC voltage. 12V is supplied to the high-voltage board, which generates a high voltage of more than 700V, and lights up the LCD tube (which looks like a fluorescent tube at home), and now most of them are small LED bulbs. 5V is supplied to the driver board and the display circuit board, so that they can convert the signal.

That's all. Specific things, you can disassemble the monitor and understand it at a glance. The structure is simple.

The principle is that the signal source transmits the signal to the display, and the display board processes the graphics into different currents on the LCD screen.

Learn how LCD monitors work.