Lighting the future comprehensive analysis of LED light source technology

Since the light emitting diode (LED) was invented in 1960s, this new type of light source has been widely used in the field of display, signal lamp, landscape lighting, indicator lamp and so on. In our daily use of light source equipment, LED and incandescent lamp, fluorescent lamp tied for the top three, it can be said that the LED light source has penetrated into all aspects of our lives.

In the early stage of LED, it was more common as a common lighting source. However, with the development of technology, the field of LED applications has become increasingly broad, including LED TV, LED display, LED printers, LED projectors and other products have been available. Compared to other incandescent and fluorescent lamps, LED light source appears the shortest time, but precisely because of this, its own advantages are more. It can be said that the LED light source has been identified as the future of the main light source. Below, the author on the technical characteristics of LED light source and we have a preliminary discussion.

LED is a new type of light source (image from the network)

LED, commonly known as light emitting diodes, is a kind of luminous display device which can directly convert electric energy into light energy. Early LED are made by GaAs, with the progress of technology, now most of the gap (GaP) semiconductor manufacturing etc.. LED is characterized by high luminous efficiency, energy saving and environmental protection, fast response, vibration resistance, etc..

LED large screen inside the bird's nest

The original LED light source can send out the color is red, into the end of twentieth Century by the end of 90, LED has been able to issue red, blue, orange, yellow, green and other monochrome. Eventually, after entering in 1998, white LED light source R & D success, and now RGB tricolor LED light source has also been a large-scale application. In our common display devices, the most commonly used is monochrome white LED and RGB tricolor LED.

Compared with ordinary light source equipment, LED light source has many advantages such as energy saving, environmental protection, high luminous efficiency, wide color gamut and so on.

In the previous paper, we mentioned that the most widely used light source is incandescent lamp, fluorescent lamp and LED lamp. In terms of light efficiency, incandescent light efficiency in 12-24 lumens / watt, fluorescent light efficiency is 50-120 lumens / watt.

According to statistics, in 1998 when the white LED light source has just launched to light only 5 LM / W, to 2005 when the light efficiency can reach 50 LM / W, is expected to 2015 light efficiency of LED could reach 150-200 LM / W. In addition, insiders said that the price of LED every 10 years down to the original 1/10, and the performance will be increased by 20 times.

Ordinary lamp life short

Most readers will know, we often use household incandescent life is short, usually after the use of one or two years need to replace the bulb, while the life theory of LED lighting value up to 100 thousand hours (usually nominal 20 thousand hours), in the life of over 10 years, LED lighting has greatly reduced the user maintenance replacement the cost of inputs.

LED dot matrix layout

LED generally use dot matrix light, if the brightness requirements are higher, the need for thousands of LED light bulb arrangement. However, the LED bulb response speed, especially in the large screen display, you can make use of the characteristics of fast switching to change different images.

In the above we mentioned that the current LED is divided into RGB primary colors and white LED. White LED is cheaper, lower power consumption, while the three color LED wider color gamut, expensive. LED backlight in TV, monitor, notebook applications to ensure that the screen longer life, lower power consumption, wider color gamut, color is more uniform. At the same time, LED also led to these electrical light source planarization (LED screen thinner).

LED bulb because mercury free, environmental pollution is greatly reduced. In addition, LED light source also has the characteristics of vibration resistance, wide color gamut and so on.

In the IT industry, LED is mainly used in display devices, such as notebook screens, LCD monitors, LCD TVs and projectors, there are already some models to the market.

LED display products are increasing

In contrast, because of the brightness requirements are not high, LED display, LED backlight notebook, LED TV has been a considerable number of products. Although the price of such products is relatively high, but because the color display ability is better, or get a lot of consumer recognition.

Notebook computer using LED light source

But in the projector industry, especially in business, education, engineering and other fields of the projector light source of hundreds of thousands of lumens, and want to achieve the brightness of the cost of such may require more than 100 thousand yuan, so that the little LED projector available. In addition, televisions, monitors and other parts of the product for the three color LED light-emitting technology, while the projector is only used for white LED light-emitting technology.

However, with the projector digital entertainment, to speed up the process, now some 100 lumens per LED projectors have been developed, the price is relatively reasonable, such as the Optoma PK-101 projector 10 lumens, the price is only 3999 yuan, 150 lumens projector Samsung SP-P400B price is only 7999 yuan. According to the latest news shows, LED light source 1080p projector will also come out in June 09, the brightness of 700 lumens, priced at about $80 thousand.

LED light source using the 1080P projector is coming out

LED light source is the biggest change is to reduce the volume of the body, to extend the life of the bulb. Before, the projection lamp life ordinary only 2000-4000 hours, but the LED bulb can ensure the service life of up to 20 thousand hours, and now an ordinary projector lamp replacement costs in the 2000-3000 yuan, LED saves