Local Dimming is a local dimming technology used in LCD, OLED, and 4K LED TVs. The technology helps to saturate the black color and thereby improve the quality of the reproduced image. The technology was developed to improve the performance of LEDs that do not give black enough depth.
Why do i need Local Dimming in device
On many televisions, the black color takes on a grayish tint, so many manufacturers are developing new technologies that will improve its contrast. Improving the saturation and depth of black is due to turning off part of the LEDs.
The panel of TVs with a 4K screen, if necessary, blocks part of the matrix pixels in certain areas of the screen. However, blocking the flow is not entirely perfect, so this technology is very important.
The technology allows you to analyze the brightness of dark and bright areas, and then adjust the gradation of black shades for each area separately.
Important! If the TV has side illumination, the use of local dimming technology can lead to flicker, image lag and excessive black depth. With direct illumination, such problems are not observed.
How to set up Local Dimming
The function can be found in liquid crystal models having side illumination; in direct-illuminated models (including full-matrix 4K models).
Local dimming can reduce the screen area and increase the contrast ratio. The function can work at different levels. On some 4K TVs (LED or LCD), you can turn off the LEDs in the backlight in order to increase the maximum color depth level. However, in most cases, you can turn off only a small part of the backlight - which leads to the appearance of the halo effect.
The halo effect is present on almost all TVs, because this technology rarely allows you to achieve the ideal color depth.
Full-matrix 4K displays provide better dimming. The fact is that in such monitors, many LEDs are involved in the visualization of the picture, which are involved in the formation of the light flux. The array of LEDs is divided into numerous zones.
These LEDs can be turned on and off for any user needs. This function is called full-matrix dimming. Some expensive 4K TVs allow you to turn off each individual LED among thousands of others.
Important! To display the maximum contrast picture on the LCD, it is best to use this function in a wide range.
OLED TVs have the best implementation of local dimming. OLED technology allows you to more precisely control the brightness and depth of black.
The fact is that they do not have side LED backlighting and an LCD screen. That is why you can adjust the brightness and dimming level of each individual pixel. Due to these features, OLED screens are superior to their competitors.
Important! This feature can both improve and degrade image quality. In some cases, the user may not see the difference at all before and after dimming.
Practice shows that dimming the screen is nothing more than a simple marketing move. As mentioned above, most users do not notice the difference before and after enabling the function.
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