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LED Backlight Panel Structure

Sep 14, 2017

LED backlight is the use of LED (light-emitting diode) as a liquid crystal display backlight. Compared with the traditional CCFL (cold cathode) backlight, LED has low power consumption, low heat, high brightness, long life and other characteristics, is expected to completely replace the traditional backlight system in recent years.

LED backlight can improve the LCD display color performance. LED light is produced by three different LEDs, providing a very consistent color spectrum of the LCD image filter itself.

The Chinese character of the backlight is interpreted as "the light is not directly exposed" or "the direct exposure to light".

In the electronics industry, backlighting is a form of lighting that is often used on LCD displays. Backlit and front light is different in that the backlight is from the side or behind the irradiation, while the former name is the name of the light from the front. They are used to increase the brightness in the low light source environment and the brightness of the computer monitor, LCD screen, and CRT display in a similar way to produce light.

The light source may be incandescent bulbs, electro-optical panels (ELP), light-emitting diodes (LED), cold cathode tube (CCFL) and so on. The electro-optic panel provides uniform light across the surface, while the other backlight modules use a diffuser to provide uniform light from a non-uniform light source.

Backlight can be any kind of color, monochrome LCD usually yellow, green, blue, white and other backlight. While the color display uses white white light, because it covers the most shade.

LED backlight is used in small, cheap LCD panel. His light is usually colored, although the white backlight has become increasingly common. Electro-optic panels are often used in large displays, when the uniform backlight is very important. The electro-optical panel needs to be driven via a high-voltage alternating current, which is provided by an inverter circuit. The cold cathode tube is used on a computer monitor, and the color is usually white, which also requires the use of converters and astigmatists. The incandescent backlight is used when high brightness is required, but its drawback is that the life of the incandescent bulb is rather limited and it produces a lot of heat.

LED backlight structure is divided into two kinds, single-series power supply or multiple series / parallel power supply. A single tandem power supply uses a lower constant current, but the input power must be boosted to the total forward voltage level of the tandem power supply before the LED can be driven. On the contrary, multiple sets of tandem / parallel LED power supply, although the need for higher current to drive, but reduced the demand for high voltage. The difference in boost converter requirements depends on cost, complexity and energy conversion efficiency (for the user, the battery life is equivalent to the charge cycle). Will ultimately determine the best solution based on the product characteristics, size and performance requirements of the device itself.

And LED / OLED display of the difference

LED backlight refers to the use of LED (light-emitting diode) as a liquid crystal display backlight, and LED-backlit display is only the LCD backlight from the traditional CCFL cold light tube (similar to fluorescent) to LED (light-emitting diode). The principle of liquid crystal imaging can be simply understood as the outside of the voltage applied to the liquid crystal molecules will be deflected as the gate-like way to block the light emitted by the backlight, and then the light projection in different colors of color filters to form images.

LED display is a microelectronics technology, computer technology, information processing in one, with its colorful, wide dynamic range, high brightness, long life, stable and reliable, etc., become the most dominant public display media, LED display Has been widely used in large square, commercial advertising, sports venues, information dissemination, press releases, securities transactions, to meet the needs of different environments. LED display is a way through the control of semiconductor light-emitting diode display, its approximate look is by a lot of usually red light-emitting diodes, light off the light to show the characters. Used to display text, graphics, images, animation, market, video, video signals and other information display screen.

OLED display because of the same time with self-luminous, no backlight, high contrast, thin thickness, wide viewing angle, fast response, can be used for flexible panel, the use of a wide temperature range, simple structure and the process of excellent features, Think of the next generation of flat panel display emerging application technology.

Many users easy to OLED and manufacturers speculation more LED backlight linked together, in fact, OLED and LED backlight is completely different display technology. OLED is driven by the current to the organic film itself to light, the hair can be red, green, blue, white and other monochrome, the same can also achieve full color effect. So OLED is a different from the CRT, LED and LCD technology, the new principle of light.

In general, LED display, LED backlight, OLED is three completely different imaging technology.