What is the LED backlight of an LCD TV?

The backlight of the LED LCD screen has multiple sets of LED lights. The backlight is divided into two illumination modes, and the structure is slightly different: one is the back-through direct type, the light source is directly installed on the back of the LCD panel, and the LED light directly illuminates the LCD panel. This method often has 4 groups, 6 groups or more. Group of LED lights. The second is the side-through type, the light source is installed on the side of the thick light guide plate, this method often has 1 or 2 groups of LED lights.

What is the LED backlight of an LCD TV?cid=15

The performance and parameters of several groups of LED lights on the same screen are the same. Each group of LED lights is composed of multiple LED lamp beads, and each LED unit is assembled on a metal strip using a pressure welding process. Each group is composed of multiple LED lamp beads in series. How to distinguish whether the LED lamp beads on an LED strip are all connected in series or segmented in series? One is to look at the power socket on the metal bar, and the other is to look at the number on the metal bar. If there are only two pins in the socket, it means that the LED lamp beads on this strip are all connected in series. If there are only three pins in the socket, it means that the LED lamp beads on this strip are connected in two groups in series. Another method is to distinguish according to the numbers marked on the lamp beads on the light bar. The edges of the LED lamp beads on the conventional light bar have numbers. For example, there are 52 LEDs in the total number of lamp beads on a light bar. If the number is marked From "1" to "52", that means these 52 grains are connected in series. For example, there are 60 LEDs on a light bar, and the number marked from "1" to "20", then "1" to "20"...20" means that 20 LEDs are connected in series to form a group. There are three groups.

Each of the lamp beads on a common light bar is powered by 3.2V. How many beads are on a light bar and how many beads are divided into groups, so that the power supply voltage can be accurately calculated. For example, the models of the two light bars are completely different, but the length of the light bar and the power supply interface are the same. Whether it can be replaced, you need to use the method described above to calculate the power supply voltage and check whether the lamp bead current is consistent.


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