Into the twenty-first century, Energy Consumption is increasingly becoming the focus of the entire human society. For the basic needs for lighting, how to be more efficient use of energy to produce more light, a new lighting technology to explore the great driving force. From the original fuel to the incandescent lighting from fluorescent to explore the various light-emitting materials, gave birth to LED Lighting technology. In today's society needs a variety of media devices differentiated lighting environment and further promote the use of a variety of human exploration for the high brightness LED lighting. The application of LED lighting has attracted wide attention.
LED performance characteristics of the basic principles and
First let us introduce the basic principle of LED performance characteristics. LED's basic structure is an Electroluminescence Semiconductor materials , Placed in a wire rack, and then surrounded with epoxy resin seal, protect the internal core wire effect, so LED's seismic performance. LED The core part by the p type semiconductor and n type semiconductor chips formed in the p type semiconductor and n type semiconductor between a backing layer, called the PN node. In some semiconductor materials, PN junction, the injection of minority carrier and majority carrier recombination extra time to time to the form of light energy released, which convert light energy directly into electrical energy. PN junction reverse voltage, minority carrier injection is difficult, it is not light. When it is in working condition when the positive (that ends with a positive voltage), current flows from the LED anode cathode, the semiconductor crystal on the issue from the ultraviolet to infrared light of different colors of light intensity and current.
LED light source has the following characteristics:
1. Voltage: LED is low voltage through the wizard, you can use low-voltage power drive, power supply voltage varies according to the final product is a safer lighting, especially for public places.
2. Performance: the case of equal illumination consumes less energy than incandescent lamps with luminous efficiency of 80% reduction.
3. Applicability: Each LED module is 3-5mm small piece of square, it can be fabricated into various shapes of the device, and for volatile environment.
4. Stability: typically 10 million hours of light for the initial 50% decline.
5. Response time: the incandescent millisecond response time, LED lights nanosecond response time.
6. On the environmental pollution: no harmful metal mercury.
7. Color: LED luminous efficiency and color and production of LED light-emitting materials and the process, there are red, green, blue three basic colors.
8. Price: Compared with incandescent lamps, LED high prices, the price of a few LED with an incandescent lamp can be quite a price, but as technology advances in technology, you can gradually enhance the cost-effective.
LED Driver Solution
LED Since inception, we have great concern, LED drive device and drive method for continuously updating more effective to drive LED lighting for mankind. From the early DC / DC Switching Power Supply To the charge pump, and the pursuit of cost drivers and the low side LDO, the application of different people use different drive the next line, as the market focus of attention, portable display backlight is LED backlit applications key market for portable below backlight display products, introduced the LED drive current of several common programs.
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