What is the application background of LED headlights?

LED headlamps refer to car headlamps that use white LEDs. On May 17, 2007, Toyota announced the Lexus LS600H, the world's first highest-class hybrid vehicle, to equip it with white light-emitting diode (LED) headlamps. The service life is up to 10,000 hours, and the lighting time does not exceed a second.

The power consumption is lower than that of the popular products of HID lamps, and it is comparable to the high-end products of HID lamps, and it is expected that the power consumption will be lower if further improvements are made in the future.

White LED technology has made significant progress, and there are already products that surpass fluorescent lamps and HID lamps, with a luminous efficiency of 100LM W. Products with a luminous flux of more than 100 lm per white LED are also emerging, and their application in the lighting field is accelerating. The Lexus LS600H uses five white LEDs with a luminous flux of 400 lm to achieve the brightness necessary for low beams.

The product was developed by Koito Manufacturing.

The headlamps developed by Koito Manufacturing Co., Ltd. and installed on Toyota's Lexus LS600H use five white LEDs for the auxiliary lights. Each white LED light uses a white LED module.

During the development process, we faced issues such as ensuring brightness, reducing power consumption, and taking measures against heat generation. The brightness needs to be at least 20mcd m2 as the halogen lampThe white LEDs only have a few mcd m2

For this purpose, the package is equipped with four large-size blue LED chips of about 1 mm square, each chip can input an input current of 700 mA), and the entire LED headlamp LED headlamp package has a total of 10 watts of power. As a result, a brightness of 25mcd m2 is obtained.

But if you supply a lot of power to each chip, the luminous efficiency will decrease. Compared with HID lamps, the headlamp of the Lexus LS600H actually works with a luminous efficiency of only 40lm W, which means that the power consumption is larger. For this reason, Koito Manufacturing has improved the effective use of light.

The specific method is to give different light distribution characteristics to the multiple white LED lamps equipped with different light distribution characteristics to make a light distribution pattern. Reduced light loss compared to when making complex light distribution patterns on one lamp.

From the Audi R8 electronic system to the full use of LED lights, to Mercedes-Benz, BMW, Cadillac, Toyota and other companies have also launched LED headlamps to replace the traditional incandescent, HID lights of the car models, I believe that soon more car manufacturers will LED lights as the first choice for automotive lighting.

As early as 10 years ago, LED has embarked on the journey to enter the automotive field, at present, LED in the car lighting and brake lights, emergency lights, daytime running lights and other aspects of the application has achieved remarkable results, LED in the vehicle interior and exterior lighting source has exceeded 80%. With the rapid development of LED lighting technology and the gradual reduction of costs, LED headlamps are getting closer and closer to the bright prospect of large-scale application in mass production vehicle systems after technical verification and concept car display in recent years.

Koito has also improved the structure of the white LED lamp when illuminated by high beams. High beams need to illuminate a light distribution pattern below the horizontal line. In the past, the pattern was created by shading the light, but this time a mirror called a "beam shaper" is used to change the direction of the light shining above the horizontal line.

By doing so, more than half of the total luminous flux emitted by the white LEDs can be supplied to the headlamps. Compared with HID lamps and halogen lamps, which can only extract about 1 3 full luminous flux, the efficiency is greatly improved. It achieves the same power consumption as when the Lexus LS460 uses a high-end HID lamp as a headlamp.

In order to ensure longevity, Koito Manufacturing has also carefully studied heat countermeasures. The LED headlamp module had to be installed in the same space as the LS460 when using the HID lamp, so heat countermeasures were required within a limited shape. Therefore, the LED chip was first improved so that it can be used even at bonding temperatures up to 150 °C.

At present, most of the LED fill lights are used in large quantities. It has rapidly become popular due to its high light efficiency, low voltage, small size, long life, fast response speed, strong seismic resistance, energy saving, environmental protection and other characteristics. The new generation of camera lights all use LED light-emitting diodes as the emitter-emitting body, and the rechargeable battery is used for power.

There are also some power supply methods that are connected to the external mains. LED camera lights are divided into high-power LED lights and low-power LED lights.

Fill light is a kind of lamp used to compensate for some equipment or plants due to lack of illumination. For example, photography lights are the most common, and there are some greenhouse lights, license plate lights, and so on. Each lamp is designed differently depending on the purpose.

Camera fill lights are also called camera lights, headlights, news lights, etc. Its main function is to provide auxiliary light when shooting in a lack of light conditions, so as to obtain reasonable picture material.

LED backlight refers to the use of LEDs (light-emitting diodes) as the backlight of liquid crystal displays. Compared with the traditional CCFL (cold cathode tube) backlight, LED has the characteristics of low power consumption, low calorific value, high brightness and long life, and is expected to completely replace the traditional backlight system in recent years.

In the electronics industry, backlight is a form of illumination that is often used on LCD displays. The difference between a backlit type and a frontlit type is that the backlight shines from the side or from behind, while the front light shines from the front, as the name suggests. They are used to increase illumination in low-light environments and brightness on computer monitors and LCD screens, producing light in a similar way to CRT displays.

Its light source may be incandescent bulbs, electro-optical panels (ELPs), light-emitting diodes (LEDs), cold cathode tubes (CCFLs), etc. Electro-optical panels provide uniform light across the entire surface, while other backlight modules use diffusers to provide uniform light from uneven light sources.

The backlight can be any kind of color, and monochrome liquid crystals usually have yellow, green, blue, white, and other backlights. The color display, on the other hand, uses white white light because it covers the most color light.

LED backlights are used in small, inexpensive LCD panels. His light is usually colored, although white backlighting has become more common. Electro-optical panels are often used for large displays, where uniform backlighting is important.

The electro-optical panel needs to be driven by high-voltage alternating current, which is provided by a reverse inverter circuit. Cold cathode tubes are used on computer monitors, such as computer monitors, which are usually white in color, which also requires the inverter and diffuser to be used. Incandescent backlights are used when high brightness is required, but the disadvantage is that incandescent bulbs have a very limited lifespan and generate a considerable amount of heat.

LED backlight enhances the color performance of LCD displays. LED light is generated by three separate LEDs, providing a color spectrum that closely matches the LCD dot filter.

*Automotive: backlight indication of on-board *** buttons and switches.

Communication equipment: mobile phone, **, fax machine button backlight.

Indoor signboards. Handheld device: signal indication.

Mobile phone: key backlight indicator, flashlight.

Small and medium-sized LCM: Backlight.

PDA: Key backlit indication.

In order to improve driving safety, the European Union has stipulated that all new cars in the EU must be equipped with LED Daytime Running Light (DRL) since 2011. In fact, the widespread use of LED daytime running lights stems from a standard for automotive lights mandated by the European Union. On September 24, 2008, the European Commission announced that in order to improve driving safety, from February 7, 2011, all new passenger cars and minivans in the European Union, as well as all types of new trucks and buses from August 7, 2012, must be equipped with LED daytime running lights (DRL).

The reason for the mandatory introduction of this policy is that the European Commission found in a survey that the effect of turning on the headlights during daytime driving in North America in the early days can reduce the probability of vehicle accidents and fatalities.

LED daytime running lights are different from ordinary low beams in that they are specially designed for daytime running lighting and consume only 15% of the energy of ordinary low beams. As soon as the engine is activated, the LED daytime running lights automatically turn on and increase in brightness to attract the attention of other motorized vehicles, non-motorized vehicles and pedestrians on the road. When night falls, the LED daytime running lights turn off automatically when the driver manually turns on the low beams.

From the perspective of those EU countries that have begun to explore and have responded to this regulation, the use of LED daytime running lights has indeed played a positive and effective role in improving road safety and reducing traffic accidents. Vehicles such as cars, vans and buses are equipped with LED daytime running lights to significantly improve their visibility, thus increasing driving safety.

The function of the backlight module is nothing more than to make the light emitted by the point light source or line light source into a surface light source through diffuse reflection. However, this backlight has a lot of knowledge, and when it is matched with different numbers of lamps, the texture of the surface of the pants will change differently, and the design of the backlight plate covers optical design, precision molds, etching, printing and other precision technologies. Production.

The backlight module of LCD-TV accounts for about 23% (15 inches) to 37% (30 inches) of the raw material cost, which is the largest proportion of LCD-TV raw materials. Among the backlight modules, the optical film is the most expensive, accounting for 44% of the cost of the backlight module, the light guide rubber plate accounts for 16%, the lamp accounts for 12%, and others such as lampshade and outer frame account for 28%. A0 China has become the world's largest producer of TN-LCD.

According to statistics, in 2000, the sales volume of China's display industry was about 40.7 billion yuan. Among them, the LCD display is 6 billion yuan.

By the end of this year, the total industrial output value of China's display industry will be about 60 billion yuan.