Cách phân loại đèn nền LED
Hiện tại, according to the type of LED backlight technology, it can be divided into RGB-LED and white LED. The former takes advantage of the ability of dynamic partition backlight technology and the excellent light source of three-color RGB LED, which has a qualitative leap in color and contrast compared with the traditional backlight, so it is usually used in high-end TV products, and the general cost is above 3W yuan. The latter is a more common type of LED backlight, which is also widely used in notebooks and liquid crystal displays, white LED backlight usually uses light intake from the edge of the display screen, and RGB LED and traditional backlight direct irradiation is different.
According to the incidence position of the backlight: the LED backlight module is divided into two categories according to the incidence position of the light source: straight down type and side type, which can be roughly divided into straight down type RGB-LED, straight down type white LED, side light type white LED, vân vân.
The difference between RGB-LED and white LED: RGB LED color gamut performance is slightly better, the disadvantage is that the cost is higher, the price of TV finished products is still difficult to let ordinary consumers accept; The white LED light source, although slightly inferior to the RGB LED in the color gamut, but its relatively high contrast and technology to bear the cost is RGB-LED can not be matched.
The difference between the straight down type and the side in type: The LED side light source emits the light source from both sides of the fuselage, and the light is projected onto the panel through the built-in high light transmittance light guide plate. The biggest limit on the thickness of the LCD is the thickness of the fluorescent lamp, and the side light source is located on both sides of the projection position, so that it does not occupy the space of the thickness of the TV.
Compared with the side light source, the direct-down backlight LED can dynamically control the backlight, so that when the image of some dark scenes is displayed, it is only necessary to adjust the local light of the necessary backlight area (black or dark part on the screen), đó là, it can show the high-quality image effect of light and dark contrast.
Objectively speaking, various positions and light sources have their own technical advantages. Through different trade-offs, different product demands can be achieved. Tuy nhiên, LED LCD TV is still in the introduction period, and direct-down RGB LED is not well reflected in the cost of the whole machine. Vì thế, side light white LED is a more reasonable solution at this stage.