It is generally abnormal for high brightness lcd display to have bright or dark spots.

Under normal circumstances, an high brightness lcd display should be able to display images and colors uniformly without these abnormal points. Bright spots usually refer to pixels on the screen that remain bright and are not controlled by image signals, while dark spots refer to pixels that remain in a dark state and do not emit light.

These bright or dark spots may be caused by some defects in the screen manufacturing process, such as pixel circuit failures, uneven liquid crystal materials, etc. Although in some product standards, a small number of bright or dark spots may be considered acceptable, this does not mean that their occurrence is a normal phenomenon. It only allows for a certain degree of tolerance considering factors such as manufacturing process difficulty and cost. If there are too many bright or dark spots, or if they seriously affect the display effect and user experience of the screen, it is definitely abnormal and needs to be repaired or replaced.

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What is the acceptable range for the number of bright or dark spots?

Generally speaking, for ordinary high brightness lcd displays, there are generally the following general standards in the industry:

Highlight: If it is a brand new screen, generally 1-2 highlights are allowed within an acceptable range. But if it is a high-end product or a screen with high display quality requirements, it may not allow any highlights.

Dark spots: The acceptable standard for dark spots is usually stricter than that for bright spots. Generally, better screens require no more than one dark spot. In some ordinary products, 2-3 dark spots may be allowed, but this is already considered a relatively common situation.

However, it should be noted that the specific acceptable standards for screens from different manufacturers, brands, and types (such as mobile phone screens, computer monitor screens, TV screens, etc.) may vary. Some manufacturers may have their own stricter internal standards, such as some high-end mobile phone brands requiring screens to be completely free of highlights and dark spots to meet factory standards.

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Do bright spots and dark spots affect the display effect of high brightness lcd display?

Bright spots and dark spots usually affect the display effect of LCD screens, and the specific impact depends on their number, location and severity.

1. In terms of quantity: If there are only one or two tiny bright spots or dark spots, they may not be easily noticed in normal use scenarios, and the impact on the overall display effect is relatively small. However, if there are a large number of bright spots or dark spots, they will be more obvious, making the screen look flawed, affecting the visual comfort and the overall beauty of the picture, especially when displaying a solid color background or a large area of uniform color, these abnormal points will be more prominent.

2. In terms of position: Bright spots or dark spots appearing on the edge of the screen may have a relatively small impact on vision, because people's attention is usually focused on the center area of the screen. But if they appear in the center of the screen or the main display area, even if there are only one or two, they may be easily noticed, which will have a greater impact on the viewing experience.

3. Severity: Some bright spots may be very bright, with a large difference in brightness from the surrounding normal pixels, or dark spots may be very dark, forming a clear contrast. In this case, the display effect will be seriously affected. If the brightness change of the bright spot or dark spot is relatively small, the impact on the display effect may be slightly smaller, but it may still be noticed in some pictures.

Will bright spots and dark spots expand as the usage time increases?

Bright spots and dark spots may expand or change as the usage time increases, as follows:

1. Bright spots

For bright spots formed by impurities or bubbles in the liquid crystal material, during long-term use, due to the influence of factors such as the electric field and temperature inside the screen, the impurities or bubbles may move or change, causing the size or shape of the bright spots to change, and even new bright spots may appear.

2. Dark spots

If the dark spots are caused by abnormal orientation of liquid crystal molecules, after long-term use, the abnormal orientation of liquid crystal molecules may gradually increase, causing the area of the dark spots to expand. Moreover, the surrounding liquid crystal molecules may also be affected, resulting in some grayscale changes around the dark spots.

This mainly depends on the specific reasons for its generation and factors such as the use environment of the screen. If the screen is affected by adverse factors such as external impact, overheating, overvoltage, etc. during use, the possibility of bright spots or dark spots expanding will be greatly increased.