What Does TV Backlighting Mean? What Is The Difference Between A Straight-down Backlight And A Side-entry Backlight?

When buying a TV, you must have heard the word backlight, but what exactly backlight is, must be confused. When looking at the product introduction, what is the straight-down backlight, the side-entry backlight, and the backlight partition is to see the full face of the question mark.

In this issue, we will explain the backlight.

First, what is backlighting?

LCD TVs can emit light depending on the light source, and the work of the backlight is responsible for light-emitting.

In the backlight, there are many LED lamp beads (which can be understood as the LED lamp beads in the home lamp) and then assembled with a multi-layer optical film and a liquid crystal screen, and eventually become an LCD TV.

LED backlight is dependent on external light sources for light-emitting, generally, we call it "passive backlight". At present, LCD TVs and MiniLED TVs, which are known as a new generation of technology, use this backlight method to emit light.

The other is to actively emit light, through the screen itself to emit light. OLED in high-end TVs now and plasma TVs in the past are active luminescence.

Second, how many ways are there for backlighting?

Today's main talk is the passive backlighting method, there are two main ways, one is the side-entry backlight, and the other is the straight-down backlight.

Side-entry backlight is to distribute the backlight on the side of the TV, the advantage is that the thickness of the TV can be reduced, the disadvantage is that the light control is not uniform enough, and it is easy to leak light.

In addition, the side-entry backlight needs to encapsulate the screen as a whole in the process, so the cost is also higher than the straight-down backlight.

The straight-down backlight is evenly distributed with thousands of LED beads in the LCD backplane so that the backlight can be evenly distributed on the screen.

The advantage is that the brightness is uniform, the light control is better, it is not easy to leak light, and the backlight board can be partitioned so that each area of the screen can control the brightness independently. But the disadvantage is that the thickness of the fuselage cannot be thin.

3. What is a backlit partition?

Backlight partitioning is the division of the backlight into multiple areas for independent control. At present, the advantage of the direct down backlight is that the backlight area is divided into smaller areas, and the more areas there are, the better the effect of light control.

The advantage of this control method is that it can more accurately control the brightness and darkness of the picture.

Fourth, what is the role of backlight partitioning?

Because it is necessary to control the light and shade and the switch, such as in the scene of the black night sky, at this time, it is necessary to turn off the backlight of the part without the picture, so that the contrast between the background and the picture is formed so that the picture is more layered.

If there is no partition light control, the backlight will make the picture white, and the effect of light leakage will appear. The picture has a very dirty feeling.

Fifth, is light control simple?

Light control is not difficult, but the difficulty is precise light control.

The accurate method is nothing more than adding bulbs and partitions so that the area that each bulb can control is as small as possible, but the difficulty is in how to judge whether this area should turn off the lights, which involves algorithms.

Poor algorithms can cause you to have a picture in this area, but you turn off the lights, and there is no picture in another place, but you turn on the lights.

If each light control area is not sealed enough, then there will be a large light rhyme, and the effect is not as good as not controlling. It's like a fog moving.

It is not difficult to do partition light control, not only can it be done in a straight down, but also a side-entry backlight can also achieve light control. But the difficulty is in how to control the light precisely.

The control method of backlight is to control each bulb in the smallest possible area, but how to judge whether this area is bright, which requires the algorithm to cooperate, if there is no good algorithm system can not accurately judge the picture.

For example, in a black background, obviously need to turn off the backlight, the algorithm is not accurate to turn on the backlight, the picture will appear a gray, from the perception of the picture is a gray.