Why are the pixels getting worse and worse after changing the screen of the mobile phone, and the photos are blurred?

There are three possibilities for pixel deterioration after changing the screen of the mobile phone.

First, the screen is not original, and the display pixels are different.

Second, the mobile phone is covered with dust, which may be caused by the dust when the shell is removed during maintenance. Dust still has some influence.

Third, the mobile phone has replaced components, which may be that the camera was stolen during the replacement process.

Extended data

The screen resolution of mobile phone is one of the important parameters of mobile phone, but many people may not know what is QVGA screen, HVGA screen, WVGA screen, what is VGA screen, and what is the difference between QVGA, HVGA, WVGA and VGA. The following is a detailed explanation of these issues for everyone.

In fact, all pictures are made up of points, which are called pixels. How many points are there in the horizontal direction and vertical direction of a square screen? The multiplied value is the pixel of this screen (the pixels of digital cameras are also multiplied in this way).

However, in order to express the size of the screen conveniently, it is usually represented by horizontal pixels× vertical pixels, such as 1024×768 pixels commonly used in computer screens and 240×320 pixels commonly used in mobile phones.

The ratio of 4:3, 16:9,16:10,21:9 is actually the ratio of horizontal pixels to vertical pixels in the resolution. 4: 3 is the ratio of resolution to size that we originally used, and almost all previous computer screens were 4: 3; Then widescreen monitors appeared, and 16: 10 became popular. The general resolution is 1280×800 pixels.

Later, with the development of HDTV, the resolution of 16:9 became popular, because the film sources of HDTV are usually 1080p (the resolution is 1920× 1080 pixels, and the so-called P means progressive scanning) and 720p (65440).

Because the traditional 16: 10 display device will have black edges when watching HD, while the real device with the size of 16:9 can play without black edges, which is also the reason why this full HD display device is popular.

And 2 1:9 is usually the film size ratio. Of course, there are also 2 1:9 TV and other display devices, but there are not many 2 1:9 mobile phones. Except LG BL40, only the internal screen of Nokia E90 should adopt this ratio, with a resolution of 800×352 pixels.

Having finished the basic knowledge of display device resolution, let's focus on the resolution of mobile phone screen. I often see the introduction of the mobile phone screen, and I may be a little confused about the meaning of the letters QVGA, VGA and WVGA. After reading the following explanation, you will certainly be very clear.

You can find that most popular resolutions are related to VGA, whether it is QVGA, WVGA or HVGA, because VGA is the basis of these sizes. VGA was originally a display standard for IBM computers, and later it gradually evolved into a synonym for 640×480 resolution, which is also the benchmark for most resolutions.

1、QVGA

QVGA is the abbreviation of Quarter VGA, which means a quarter of the resolution of VGA. This is the most common mobile phone screen resolution before the popularity of smart phones, with 240×320 pixels vertically and 320×240 pixels horizontally. Most mobile phones use this resolution. For example, the former Nokia E66 was QVGA.

2、HVGA

HVGA stands for half-size VGA, which means half the resolution of VGA, 480×320 pixels, and the aspect ratio is 3:2. Most screens of this resolution are used in PDA. Of course, the iPhone and the first Google phone -T-MobileG 1 all use this resolution, and the BlackBerry also has a screen with HVGA resolution. IPhone 3GS uses a screen with HVGA resolution.

3、WVGA

The full name of WVGA must be easy for everyone to think of, that is, wide VGA with resolutions of 854×480 pixels and 800×480 pixels respectively. Because many web pages are 800 pixels wide, this resolution is usually used for PDA or high-end smart phone, which is convenient for users to browse web pages. Most of Sharp's mobile phones also use WVGA-level resolution screens.

4、QCIF

In fact, before the popularization of QVGA resolution, most mobile phones used the resolution of QIF, which is 176× 144 pixels, which actually means a quarter of CIF. CIF is the standard acquisition resolution of video acquisition equipment, and the common intermediate format is the common standardized image format. ?

Therefore, most mobile phone screens that can shoot video in QCIF format later adopted the resolution of 176×220 pixels, and the very classic Motorola V3 internal screen resolution was 176×220 pixels.

Of course, there are many older resolutions, such as 96×96, 128× 128. These resolutions are hard to see, and most of them appear as the external screens of flip phones, so I won't introduce them here. All the above are screen resolutions below VGA, which are mostly used for mobile phone screens. The following describes the real device resolution above VGA.

5、SVGA

SVGA is super VGA, which is our common 800×600 pixels, while 1024×768 pixels are no longer based on VGA standard, and XGA has become the benchmark for the resolution of new generation display devices.

With the development of display equipment industry, SXGA+( 1400× 1050 pixel), UXGA( 1600× 1200 pixel, commonly used in 20-inch or 2 1 inch displays), QXGA (.

But this is only a theoretical name, and there is no display device with this resolution in the real world. Most 17 inch color displays are SVGA, XGA or SXGA+ level.

The development of 4:3 screen also drives the development of widescreen. At first, WVGA(800×480 pixels) was commonly used in most small and medium-sized netbooks, and later WSVGA( 1024×600 resolution) was used in 8.9-inch or 10-inch netbooks.

6、WXGA

After development, WXGA( 1280×800 pixels) is gradually popularized on 13- 15 inch notebook computers. WXGA+( 1440×900 pixels) is mostly used for 19 inch widescreen; WSXGA+( 1680× 1050 pixels) is commonly used for 20-inch and 22-inch widescreens, and some 15.4-inch notebooks use this resolution.

WUXGA( 1920× 1200 pixels) is one of the most popular resolutions, which is the resolution of most 24-27 inch widescreen displays. The resolution of WQXGA(2560× 1600 pixels) is mainly used for 30-inch LCD screens, such as the resolution adopted by the famous Apple Cinema Display and Dell UltraSharp 3007WFP/3008 WFP.

Reference: Xinhuanet? Four questions about mobile phone repair O2O and Baidu Encyclopedia? Mobile phone screen? 、

Baidu encyclopedia? Mobile phone screen resolution