Oled Display Arduino.The difference between LCD and CRT display. Display as one of the oldest and most indispensable hardware of PC, PConline traces the source of the monitor and takes you to understand the past life and present life of the monitor.

Monitor Lecture (1): the difference between LCD and CRT display.

In the long and arduous innovation process of PC industry, with the progress of display technology, display classification is more and more detailed, which can be divided into flat panel display (FPD) and cathode ray tube (CRT), also known as flat panel display. CRT is the overlord of display when FPD is not mature, with mature technology, low cost, excellent color and short response time. However, due to its huge size, flicker, image distortion and other fatal defects, the civilian market share is gradually replaced by FPD. Flat panel display, as the name implies, is a relatively thin display. It can be divided into LCD liquid crystal display, PDP plasma display, OLED organic light emitting diode display, FED field emission display and so on. In daily applications, only LCD liquid crystal display is popular.

Knowledge Popularization one: CRT display.

I believe that the monitor in the above picture is not strange to everyone, with such strange titles as tofu block, big-head display and so on. In fact, its real scientific name is CRT display (cathode ray picture tube). The CRT display works by emitting an electron beam to the inner surface of the screen through an electron gun, which makes the phosphor on the inner surface glow to present the picture. However, the phosphor will be extinguished soon after it is lit, so even if it stays in the same picture, the electron gun must be constantly emitted and excited to excite the phosphor, resulting in an obvious sense of flicker in the display effect.

Knowledge popular Science II: LCD display.

LCD display generally refers to liquid crystal display, and it is also the most widely used type of display. As the name implies, its working principle is naturally closely related to liquid crystal molecules. To put it simply, it uses the liquid crystal “electro-optic effect” to display. Under the influence of electric field, magnetic field and other external conditions, liquid crystal molecules change and rearrange, resulting in changes in various optical properties of liquid crystals. And with the cooperation of the back lamp, the picture is formed.

Editor’s generation has witnessed the evolution of displays from CRT to LCD displays. Why did LCD replace CRT? Next, let’s discuss this problem.

First, space occupation comparison: the gap is not a little bit.

Today, when electronic products are becoming more and more refined and simplified, LCD displays get rid of the shackles of CRT display electron guns and reduce a lot of desktop space. The advantages of the two types of displays in appearance are obvious, so I won’t repeat them here.

Second, soft picture: no longer blinded your eyes.

As the work of the CRT display requires the electron gun to continuously light up the fluorescent substances on the screen to maintain the consistency of the screen, the refresh rate of the CRT display must be above 85Hz in order to avoid obvious screen flicker. On the other hand, the LCD display is arranged on both sides of the screen as a lamp tube to provide a uniform background light source for liquid crystal material. Therefore, the picture will not be affected by the refresh rate and flicker, which can reduce the damage of the display to the eyes, and it is not easy to get tired when using the computer for a long time. In addition, the damage to the eyes caused by the electromagnetic radiation of the CRT display should not be underestimated.

Third, display effect comparison: there is picture distortion in CRT.

The CRT display uses the electromagnetic field generated by the deflection coil to accurately control the position of the electron beam on the screen, resulting in occasional positioning errors, so the CRT display often has varying degrees of geometric distortion and linear distortion. In contrast, the LCD panel is composed of multiple pixels, and each independent pixel color is controlled by three basic colors: red, green and blue (R, G, B), so as to prevent the appearance of picture distortion.

Fourth, power consumption comparison: the monitor is no longer a warm hand.

I believe most netizens have a deep understanding of what is discussed in the picture above. This is because the CRT picture tube uses a thermal light source, which emits a lot of heat in the process of use. Of course, the power consumption increases.

Usually a 17-inch CRT display has a power of 80cm 100W, which is more than twice the power consumption of a LCD display of the same size. And a 26-inch LCD display in the case of 100% brightness, the power is only 87W LCD can be said to have obvious advantages in energy saving.