This is the first article in this series. This article introduces the screen understanding under the computer system and fills in the pits. The previous programming, compilation, CPU work, and memory operation must be displayed in the end.

series. This article goes into the screen understanding under the computer system and fills in the gaps. The previous programming, compilation, , CPU, work, and memory operation must be displayed in the end. As for the screen here, we use the impression of the screen in daily life, combined with the screen principle in the eyes of a computer, to try to be easy to understand, down-to-earth, interesting and not boring, but the style of this series has always been like this haha, let me explain bring it on.

The screen, the scientific name of the monitor, is a magical mirror that is shown to you. Countless people have seen the battlefield, the situation in places that cannot be reached, the cold Mars, the hot Tokyo, etc. . . But before talking about the screen, let's take 2 minutes to get to know an ancient operating system. Microsoft released in 1990 the first to support the complete Chinese operating system, Windows 3.0. The picture shown is win3.1. In fact, it is almost the same, and the hardware requirements are also the same. Why does the operating system

fully support Chinese? Because the hardware level is compared with earlier windows such as windows2.0, its memory is larger and can support longer string . Compared with Windows 3.0, the Chinese font library of Win3.1 is more complete, and there are few cases of word-mouth words. The root cause of everything is the rapid advancement of hardware. The minimum standards for Windows 3.0/3.1 are 1M memory, 80286 processor starting at 6MHZ, and a 6M hard drive. Compared with win2.0 released in 1987, the hardware requirements have doubled.

In order to facilitate understanding, why can the memory be increased to support Chinese? Let me know a thing, unicode string . To put it simply, there are only 26 basic letters in the English alphabet. The computer only recognizes 0101. It is easy to use 0101 to represent 26 letters. 2 raised to the fifth power is 32. It only requires 5 diodes that are powered on and off to save the value. The computer finds the address based on the square of 2 , at least 8 bits, 8 0s or 1s, and the remaining 3 can also represent positions, plus some question marks, colons and other symbols.

In Chinese, at least tens of thousands of characters have different structures. There are 20,000 commonly used words, so only 8-bit encoding is definitely not enough. If it is 16 bits, it can accommodate no, 2 to the 16th power is 65536, which can not only accommodate commonly used Chinese characters, but also Japanese, , Korean, , , Greek, , etc. characters, this is The origin of unicode strings. A general, extensive, and unified computer representation.

Chinese not only drags down the memory, that is, the memory of the memory stick, but also drags down the hard disk. Chinese documents are at least twice as many as alphabetic characters, in fact, more than that. Chinese also drags down the CPU because the addressing range is too large. The Chinese Lenovo input method has long been difficult to appear due to insufficient computer performance. This lack of performance is not only due to insufficient memory. In the era of small hard disk capacity, if the Chinese character document is too large and too many CPU requests are written, the system will crash. If the web page displays too many Chinese characters, it will be slowed down. This continued until 2002 when computers became popular with 512M memory. Things got better after using a 1GHZ processor.

Look at the unicode comparison table in the figure below. Many simplified characters in China, Japan and South Korea use a common encoding standard.

Okay, in this process, the role of the screen must be understood after seeing this. As for the CPU and the bottom layer of the computer, whatever text is displayed on the screen, I recognize 0101; as for the operating system, whatever text is displayed on the screen, I recognize the encoding, such as ascii code, such as unicode character encoding , etc.; is the screen How are coordinate systems, colors, refresh rates, etc. implemented? In fact, it is the joint function of the operating system and the underlying screen driver . The term

driver is certainly familiar to everyone. For example, the AMD graphics card driver problem often makes AMD users popular. In comparison, Nvidia's driver is much more convenient and has less trouble.

Let’s understand it this way. The drive is the car engine. You can’t see inside and don’t know how it works. But when you drive, the car works under the action of the engine. This entire power system is the drive.Software drivers are similar. The driver is software that is very close to the bottom layer. It is responsible for operating every detailed part of the hardware. For example, the screen driver is as detailed as operating every pixel. Now the screen resolution starts at 1080P, and 1920X1080 is about 2 million. Pixels, 6 million original red, green and blue pixels. These are all driven and managed. The operating system does not care about the working principle of the driver, it only needs to give normal commands. Just like you and me, we absolutely don’t care about how the driver of a mobile phone or computer screen works.

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That’s it for this issue, basic computer system knowledge. This issue is not only about the screen, but also an entry point into understanding the underlying working principles of the computer. The next issue of

will be about screens again, talking about the concepts of resolution and refresh rate. This is easy to understand, right? But it will be helpful for you to choose a monitor, such as how to see colors, how to see true and false refresh rates, etc. End of this period.