What is the difference between LCD A screen and B screen! 80

A screen: refers to no spots, within 3 bright spots and dark spots, stable display without jitter, in accordance with the above labels under TFT-LCD professional test software;

B screen: The industry generally refers to more than 3 highlights as B screen.

C screen: A screen with bright lines is called C screen.

The so-called bright spot: when the LCD is turned on, there is a pixel that does not work and lights up all the time;

The so-called dark spot: it cannot be seen when the LCD is turned on, but it can be seen under the TFT-LCD professional test software;

The so-called spotted: it will have obvious performance under TFT-LCD professional test software, and it is not obvious in general use;

Set the screen to be all black, all white, and see how many dead pixels correspond

To put it simply: AA screen is free of a dead pixel and bright spot. A screen with less than three dead pixels.

The B screen is less than five dead pixels. Needless to say, the C screen is unqualified. You can use this chkscrn software and disptest application software.

It can be seen if there are dead pixels and bright spots.

Point defects (grade of LCD panels).

The liquid crystal panel of an LCD display is composed of a large number of display points, and the liquid crystal material on each display point changes the refractive index of light under the control of electrical signals. The common "point defects" of LCD panels are divided into three types: bad pixels, bright spots and dark spots. Dots that are pure black under a white screen or pure white under a black screen are collectively referred to as dead pixels; The red, green, and blue dots rendered in black screen conditions are collectively referred to as bright spots; In the case of a white screen, non-simple red, green, and blue dots are collectively referred to as dark spots.

The number of dead pixels, bright spots and dark spots of the LCD panel, as well as the color purity, viewing angle and other indicators comprehensively constitute the grades A, B and C of the LCD panel. However, different LCD panel manufacturers have different grading conditions for their products: some manufacturers define LCD panels with less than 3 "point defects" as Class A, some manufacturers define LCD panels with less than 5 "point defects" as Class A, others define LCD panels with less than 8 "point defects" as Class A, and there are LCD panels without any "point defects" as Class A++ A+ and so on.

It is precisely because different LCD panel manufacturers have inconsistent regulations on the corresponding conditions of A, B and C levels, on the one hand, it leaves room for LCD manufacturers to publicize in terms of product identification, and on the other hand, it has caused confusion among consumers.

Generally, screen A shows your operation, and screen B is auxiliary, so that others can see your operation.

One is the main display.,The other is the auxiliary display.,Look at the settings.,The main display can be dragged over the icon or something.。

Because the laptop can be connected to an external monitor.

The 2 screens are the settings of the external monitors that are connected.

Within the LCD panel manufacturing industry, there are generally 4 quality disturbance classification standards for LCD screens, namely A, B, C.

The A screen is divided into three tiers: A++, A+, and A.

A: The number of dark spots is less than 3, the number of bright spots is less than 3, and the sum of bright spots and dead pixels is less than 5.

A+: has less than 3 dark spots and no bright spots on the entire screen, and less than 3 dead pixels.

A++: There are neither bright spots nor dark spots, and the number of dead pixels is 0.

A screen: refers to no spots, no bright spots and dark spots within 3, bright spots and dark spots add up to no more than 5, and the display is stable and jitter-free.

B screen: The industry generally refers to more than 3 bright spots as B screen, and the number of bright spots and dark spots adds up to 5 and less than 10 belong to B screen.

C screen: A screen with bright lines is called C screen, and the number of bright spots and dark spots added up to more than 10 belongs to C screen.

A computer A-level screen usually refers to a high-quality liquid crystal display, which has a clearer display effect, more realistic colors, and higher stability and reliability. This kind of envy screen usually uses high-quality liquid crystal materials, backlight and control circuits, and adopts more accurate display adjustment and color calibration technology, which can bring users better visual effects.

In some bright key computer products, different screen levels are usually used to distinguish different qualities. For example, B-level screen, C-level screen, etc., among which A-level screen is the highest level of screen, which is relatively higher and is also welcomed by more consumers.

It should be noted that although A-class screens are usually better than other screens, it does not mean that all A-class screens can have the same quality. There will still be some differences between different manufacturers and models, so when choosing to buy a computer, it is recommended that consumers should combine their own needs and budget, and make comprehensive considerations to choose the right product for them.

A screen: refers to no spots, within 3 bright spots and dark spots, stable display without jitter, in accordance with the above labels under TFT-LCD professional test software;

B screen: The industry generally refers to more than 3 bright spots as B screen C screen: A screen with bright lines is called C screen.

The so-called bright spot: when the LCD is turned on, there is a pixel that does not work and lights up all the time;

The so-called dark spot: it cannot be seen when the LCD is turned on, but it can be seen under the TFT-LCD professional test software;

The so-called spotted: it will have obvious performance under TFT-LCD professional test software, and it is not obvious in general use;

Within the LCD panel manufacturing industry, there are generally 4 quality grading standards for LCD screens, namely: A+, A, B, and CThe lower the grade of the panel, the lower the production cost of the product, but the more prominent the defects in quality.

For example, the fatal "bad pixels" (divided into dark spots and bright spots) that affect the visual effect of the display, the industry usually uses the "446" index as the quality standard of A-level LCD displays, that is, the number of bright spots and dark spots of the display does not exceed 4, and the number of the two together does not exceed 6. In Class A LCD displays, the vast majority of them have no bright and dark spots, and a very few bright and dark spots are very few, and they will never appear on the display**. On the contrary, there is no such standard for B, C-level LCD screens, and it depends on the luck of consumers when buying.

Secondly, the "water ripple phenomenon" is also a "hard injury" that affects the quality of the liquid crystal display, that is, the brightness of the LCD screen is unbalanced, and long-term use will cause great damage to people's eyesight. Experts pointed out that the quality problems of LCD screens such as "dead pixels" and "water ripple phenomenon" not only cannot be repaired, but will become more and more serious over time, so that the life of the LCD screen will also be shortened.

**Of course, the higher the level, the more expensive.

A screen: refers to no spots, within 3 bright spots and dark spots, stable display without jitter, in accordance with the above labels under TFT-LCD professional test software; B screen: The industry generally refers to more than 3 highlights as B screen.

The LED TV display refers to his display unit, which is composed of three primary color LED tubes

A screen: refers to no spots, within 3 bright spots and dark spots, stable display without jitter, in accordance with the above labels under TFT-LCD professional test software;

B screen: The industry generally refers to more than 3 highlights as B screen.

C screen: A screen with bright lines is called C screen.

The so-called bright spot: when the LCD is turned on, there is a pixel that does not work and lights up all the time;

The so-called dark spot: it cannot be seen when the LCD is turned on, but it can be seen under the TFT-LCD professional test software;

The so-called spotted: it will have obvious performance under TFT-LCD professional test software, and it is not obvious in general use;

The so-called bright line: the color of the LCD is generated by the horizontal and vertical scanning line scanning, each line is about millimeter wide, which of their lines appears short circuit and open circuit phenomenon is the bright line.

It is inevitable that the LCD will have bright lines and bright spots during the production process, but other other properties are in line with industry standards.

Let's put it this way.

LCD panels. The products produced by the factory are based on the performance indicators of the products when they leave the factory.

Brightness color gamut. Contrast, etc., are graded. There are many spots with severe blemishes.

etc. can not leave the factory. This is due to the limited yield of the production process of LCD panels, which cannot reach 100%.

A screen is to point out the better screen in the factory, of course, it may also be a relatively good screen in the hands of the person who sells the display. The ordinary screen is worse in terms of indicators. I think it's mainly the spots and the difference in color.

The ** of copycat LCD must be low-priced, but it is by no means produced by itself, because there are only a few companies that have the ability to produce panels. Therefore, its quality can only be said to be usable, and the stability will not be very bad, but the effect is not comparable to that of regular products.

A screen: refers to no spots, within 3 bright spots and dark spots, stable display without jitter, in accordance with the above labels under TFT-LCD professional test software;

B screen: The industry generally refers to more than 3 bright spots as B screen C screen: A screen with bright lines is called C screen.

The so-called bright spot: when the LCD is turned on, there is a pixel that does not work and lights up all the time;

The so-called dark spot: it cannot be seen when the LCD is turned on, but it can be seen under the TFT-LCD professional test software;

The so-called spotted: it will have obvious performance under TFT-LCD professional test software, and it is not obvious in general use;