What is the concept that describes the number of pixels a monitor can display?

The concept that describes the number of pixels that a monitor can display is "display resolution". Display resolution is the resolution of the monitor when displaying images, which determines the fineness of bitmap image details; display resolution refers to the number of pixels that can be displayed on the monitor, usually the number of pixels per row multiplied by the number of pixels per column, For example, 1024×768 means that the monitor can display 768 rows, 1024 columns, and a total of 786432 pixels. The higher the resolution, the more pixels the display can display and the clearer the image.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

The concept describing the number of pixels that a monitor can display is "display resolution".

Display resolution is the resolution of the monitor when displaying images. The resolution determines the fineness of the details of the bitmap image. Resolution is measured in dots, and the "dots" on the display refer to pixels.

Enlarge a picture. Each square on the picture is a point (pixel).

The value of display resolution refers to the number of horizontal and vertical pixels in the entire viewing area of ​​the display. For example, a resolution of 800×600 means that 800 pixels are displayed horizontally and 600 pixels are displayed vertically on the entire screen.

Display resolution is also called pixel resolution, or resolution for short. It refers to the number of pixels that can be displayed on the monitor. Usually, the number of pixels in each row is multiplied by the number of pixels in each column, for example: 1024×768 , indicating that the monitor can display 768 rows, 1024 columns, and a total of 786,432 pixels; the resolution is 640×480, indicating that the monitor can display 480 rows, 640 columns, and a total of 307,200 pixels. Obviously, the higher the resolution, the more pixels the display can display and the clearer the image.

The total number of horizontal pixels and vertical pixels of the display resolution is always in a certain ratio, usually 4:3, 5:4 or 8:5. Each monitor has its own maximum resolution and is compatible with other lower display resolutions, so a monitor can display multiple different resolutions. Although the higher the display resolution, the better, but there is another factor to consider, which is whether the human eye can recognize it. For example, on a 14-inch monitor with a maximum resolution of 1024×768, 800×600 is the highest resolution that the human eye can recognize (we temporarily call it the best resolution). Although the monitor can accurately detect the resolution of 1024×768, display image, but the human eye can no longer accurately identify the screen information.

On the same size screen, the higher the resolution, the smaller the display. Since the size of the monitor varies, and the display resolution represents the number of pixels in all visible ranges, the same resolution has different effects on different monitors, for example: 800×600 resolution, 14 The display accuracy of a 17-inch monitor is much higher than that of a 17-inch monitor with the same resolution.

The importance of display resolution

Display resolution is an important indicator of the monitor, and its level directly reflects the performance of the monitor. If the resolution of a monitor can reach a high level, the requirements for each part of the monitor will be correspondingly high, such as the dot pitch of the picture tube should be small, the video bandwidth should be wide, and the oscillation frequency tracking range of the horizontal oscillator circuit should be wide.

As a terminal for displaying information, the monitor is a passive device. The information it displays is controlled by the computer's graphics card. If the resolution of the information sent by the display card to the monitor is 640×480, the monitor will also work in the 640×480 display resolution mode. The information displayed on the screen will have 640 pixels in the horizontal direction and 640 pixels in the vertical direction. 480 pixels.

The resolution of the monitor can be changed through software settings. Generally, the resolution of the display card has multiple modes, such as 640×480 (16 colors), 640×480 (256 colors), 640×480 ( 64k colors), 800×600 (256 colors), 1024×768 (256 colors), etc.

The maximum resolution the monitor can reach depends on the performance of the display card. In the same way, if a monitor wants to meet the display requirements of various resolutions sent by the graphics card, it is required that the monitor should have different display modes.

In other words, this monitor is required to have a wide line oscillation frequency tracking capability. Because the display mode of a certain resolution has a fixed horizontal oscillation frequency, the higher the resolution of the display card or the higher the refresh frequency at the same resolution, the higher the horizontal oscillation frequency of the display is required.

Therefore, it is very beneficial to correctly understand the corresponding relationship between the display rate and the line oscillation frequency to correctly set the working resolution of the display card. If you set the working resolution of the display card incorrectly, the monitor may work in an abnormal state, the displayed image will be out of sync, and the monitor may burn out if it takes a long time.

The approximate relationship between display resolution and line oscillation frequency

If the display resolution is 640×480~1024×768 (refresh frequency is 60~70Hz, line by line ), then the horizontal oscillation frequency range is 30.5~48kHz;

If the display resolution is 640×480~1280×1024 (refresh frequency is 60~70Hz, line by line), the line oscillation frequency range is 30.5~64kHz;

If the display resolution is 640× 480~1600×1200 (refresh frequency is 60~70Hz, line by line), then the line oscillation frequency range is 30.5~84kHz;

The above relationship shows that as the display resolution gradually increases, the line oscillation of the display The frequency should also be gradually increased. When the resolution changes from 640×480 to 1024×768, the horizontal oscillator also increases to 48kHz. That is to say, when the display card is set to a resolution of 1024×768, a refresh frequency of 60Hz, and a progressive scan mode, in order for the monitor to work properly, the monitor's line oscillation frequency must reach 48kHz. It can be seen that the highest line oscillation frequency of the display determines the highest display resolution of the display. In progressive scan mode, the line oscillation frequency corresponding to a certain display resolution determines the maximum display resolution of the display. In progressive scan mode, the line oscillation frequency corresponding to a certain display resolution can be estimated by the following formula:

Line frequency = (number of lines blanked in the vertical direction of the vertical resolution) × refresh frequency (field frequency).

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