Shulou(Shulou.com)11/24 Report--

Do you still have the mobile phone or computer from ten years ago at home? if you can still turn it on, you might as well compare it with the current device to see if there is any gap between the two. Do you think that the mobile phone that was well used ten years ago has suddenly become very backward, but you are not aware of the great change that has taken place?

With the progress of image technology, the picture presented by electronic devices is becoming clearer, more and more stable and smooth, and a lot of terms have gradually appeared, such as resolution, pixels, refresh rate, etc., which make you dizzy, don't worry, let the document man straighten it out for you!

Resolution resolution, also known as resolution, resolution, can be subdivided into display resolution, image resolution, print resolution, scanning resolution and so on.

The following is the definition of these resolutions:

The display resolution is the resolution of the display when displaying the image, which is measured by dots, and the "dot" on the display refers to the pixel.

Image resolution refers to the amount of information stored in the image, which is the number of pixels per inch of the image.

Printer resolution, also known as output resolution, refers to the maximum number of points per inch that can be printed in both horizontal and vertical directions when printing, usually expressed as "dots per inch" or dpi (dot per inch).

Scanning resolution refers to the number of points per inch of the scanned object that can be represented by the scanning element when the all-in-one machine realizes the scanning function.

This article mainly introduces the display resolution.

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

The total number of horizontal and vertical pixels that display resolution is always proportional, usually 4:3, 16:9, or 16:10.

4:3 is the most common universal screen ratio in the television era, and it is an ancient standard handed down from the television era. Before the rise of wide screen in modern times, most of the screen resolution was based on this ratio. The specifications are shown in the following table.

VGA

SVGA

XGA

UXGA

QXGA

640 × 480

800 × 600

1024 × 768

1600 × 1200

2048 × 1536

16:9 is mainly the widescreen ratio commonly used in movie videos, which is commonly heard in 720p and 1080p. It is a screen format that is suitable for video viewing and office operations (to accommodate two documents to be processed side by side), but has relatively poor support for games (gradually getting more game support). The specifications are shown in the following table.

QHD

HD

FULL HD

Quad HD

UHD

960 × 540 (540p)

1280 × 720 (720p, quasi-HD)

1920 × 1080 (1080p, HD)

2560 × 1440 (2K resolution, ultra clear)

3840 × 2160 (4K resolution, ultra high definition)

16:10 is the common wide-screen ratio on a computer screen. The specifications are shown in the following table.

WVGA

WSVGA

WXGA

WXGA+WSXGA +

WUXGA

WQXGA

800 × 480

960 × 600

1280 × 800

1440 × 900

1680 × 1050

1920 × 1200

2560 × 1600

Each monitor has its own highest resolution and can be compatible with other lower display resolutions, so a display can be displayed at many different resolutions. Although the higher the display resolution, the better, but there is another factor to consider, that is, whether the human eye can recognize it.

Here you need to mention the concept PPI (Pixels Per Inch), the unit of density of pixels, which represents the number of pixels per inch. So the higher the PPI value, the better the display on the screen.

Father Joe put forward a concept: retinal screen. It is defined as "when the human eye looks at a screen with a PPI greater than 300 at a 10-inch (25.4cm) appearance, it will not be aware of the presence of pixels". Therefore, whether or not to detect the existence of pixels, in addition to the quality of the screen itself, the viewing distance also has a great impact.

Take the LED billboard, for example, you can hardly see the pixels when you look at it from a long distance, but when you look at it up close, you can see that it is full of pixels.

As a result, the document calculated the minimum standard of the retinal screen (here, for example, the human eye is 70 centimeters away from the computer screen):

At 1080p resolution, the display below 21.5 inches best meets the requirements of the retinal screen.

At 2K resolution, monitors less than 27 inches meet the requirements of the retina screen.

At 4K resolution, the screen size is less than 41 inches, which meets the requirements of the retinal screen, and the smaller the size is, the more delicate the image is.

Up to now, the size standards that meet the retina level at various resolutions have come out, but it should be noted that these are only theoretical data, due to many factors such as environment, sitting posture, myopia and so on. The same monitor may appear but feel different when using it.

We often see that when opening a picture or video with a mobile phone, the image is not completely covered with the screen, and black edges appear on both sides of the screen, which is due to the mismatch between the image resolution and the screen resolution of the mobile phone.

For example, there is now a computer with a screen resolution of 1920 × 1080 and several pictures with different resolutions of 2048 × 1536, 1920 × 1080 and 1280 × 800, respectively.

Let's take a look at the difference between the theoretical display and the actual display.

First of all, the theoretical and practical effects of the resolution specification of 2048 × 1536 are demonstrated.

Demonstration of theoretical and practical effects with a resolution specification of 1920 × 1080

Demonstration of theoretical and practical effects with a resolution specification of 1920 × 1080

You may not be surprised by the above image display with a size of 1920 × 1080, which is easy to understand when the same resolution is displayed on the full screen. But why the theoretical effect of the other two resolution images is different from the actual effect.

The reason is that when a picture is displayed on the TV, there will be a set of display algorithms to process the picture. This algorithm will increase or delete the pixels of the picture according to the logical resolution of the picture and the physical resolution of the screen, so that the picture can have the best display effect on the screen after processing.

For 2048-1536 resolution pictures, because the number of logical pixels exceeds the number of physical pixels on the screen, then the display algorithm in order to fully display this picture on the screen, will delete the number of logical pixels of the picture until there is a best display effect on the screen, for the deleted pixels are generally invisible to the naked eye.

For 1280 '800 resolution pictures, because the number of logical pixels is less than the number of physical pixels on the screen, the display algorithm will increase the number of logical pixels of the picture until it has the best display effect on the screen, and the increased pixels are generally invisible to the naked eye.

Refresh rate screen refresh rate is an important parameter of the display device, which represents the number of times the device can update the screen content per second. Typically, the refresh rate is measured in Hz. For example, the refresh rate of 60Hz means that the device can update the screen 60 times per second.

The higher the screen refresh rate, the more stable and smooth the screen will be. This is particularly important for applications that require fast and dynamic response, such as video games and video playback.

If the screen refresh rate is too low, the screen may appear blurred and shaded, which may affect the user experience.

In addition to providing a smoother picture, a high refresh rate can also improve the response time of the device. The response time of a device refers to the time it takes for a device to receive, to user input, and to display relevant operations.

A high refresh rate reduces response time, allowing the device to respond more quickly to user input.

In addition, different types of monitors have different refresh rates. For example, ordinary LCD displays are usually around 60 Hz, while high-end game displays can reach more than 240 Hz.

At present, the display refresh rate on the market is mainly divided into 60Hz, 120Hz, 144Hz, 240Hz and so on. Among them, 60Hz is the most common refresh rate and the lowest refresh rate.

120Hz, 144Hz, 240Hz and other high refresh rates are increasingly popular displays in recent years, because they can bring smoother picture effects, especially suitable for playing games, watching high-definition videos and other scenes.

Videos with a refresh rate of 24FPS can feel a sense of standstill compared with videos with a refresh rate of 60FPS, and there are obvious stutters in the boat and water spray in the video, which shows how important it is to have a high refresh rate.

The screen refresh rate is affected by many factors, such as hardware performance, display type and connection mode. Displays with high refresh rates usually require higher performance hardware support, such as graphics cards, CPU and so on.

The hardware level of the monitor: the hardware level of the monitor is one of the most important factors affecting the refresh rate. Generally speaking, high-end monitors have a higher refresh rate.

Performance of the video card: the performance of the video card is another important factor affecting the refresh rate of the display. If the performance of the graphics card is insufficient, even if the display itself supports a high refresh rate, it will not be able to play it out.

The standard of the transmission interface: the standard of the transmission interface will also affect the refresh rate of the display. For example, displays using HDMI 1.4 or DP 1.2 as the data interface can only achieve a maximum refresh rate of 60Hz, while using DP 1.4 or HDMI 2.0 as the data interface can support a higher refresh rate.

This article comes from the official account of Wechat: ZTE documents (ID:ztedoc)

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.