LEDs will continue to evolve and will become brighter. In the keynote address of "Green Device 2010", OSRAM Opto Semiconductor GmbH introduced the effects of LEDs on lighting and imaging equipment. Winfried Schwedler, the company's visible LED LCD backlight and consumer marketing manager, said in a keynote speech that lighting, which accounts for about 19% of the world's electricity consumption, is expected to reduce power consumption by about 30% by using high-efficiency light sources such as LEDs. . Moreover, while reducing the power consumption, the waste frequency is lower than that of incandescent bulbs and fluorescent tubes because of its long life, and thus it is also beneficial to protect the environment.
Schwedler also said that LEDs will also play a huge role in the backlight of LCD panels. The LED was originally used as a backlight source for small LCD panels for mobile phones, and later used as a backlight source for notebook computers and liquid crystal displays. Recently, LCD TV backlight sources have also adopted the LED style. He said that in 2013, the LED market will expand to about three times that of 2009, and more than half of them will be used for backlights, most of which will be used for LCD monitors and LCD TVs. At present, the light efficiency of the white LED used in the backlight source is 120 lm/W at the product level, and has reached 136 lm/W at the research and development level, reaching the cold cathode fluorescent tube of the main backlight source. Nearly twice the (CCFL), this will greatly drive the LEDization of the backlight source.
He said that in order to meet the TV power consumption standards required by environmental regulations such as EuP and Energy Star, backlights must also be LEDized. Although the CCFL can meet the 2010 standard, in 2012, the screen size consumes less than 2W per inch, and non-LED backlights do not work. If LEDs are used, power consumption of 1.5W per inch will be achieved in the near future by means of local control (Local Dimming).
The LED itself is also expected to further improve efficiency. Taking white LEDs as an example, although the luminous efficiency of a high-power product with a chip size of 1 mm square is currently 100 lm/W, Schwedler believes that it can almost double to 190 lm/W in the near future.
Trial production and display of thin backlights using the latest white LEDs
Schwedler introduced a variety of white LED products in his speech. At the "FPD International 2010/Green Device 2010" exhibition, the company disclosed the new product "TOPLED Compact 4520", which uses a backlight source such as a liquid crystal TV, as a thin and high-efficiency backlight. LED backlights for 46-inch LCD panels and LCD TVs using the LED backlights were on display.
The LED backlight is an edge-emitting type in which one row of 210 white LEDs (two narrow rectangular modules each having 105 white LEDs) are arranged in the upper and lower rows. The maximum brightness of the LCD TV is 400 nit, and the power consumption is 120 W (except for the drive circuit). The LED backlight of LCD TVs is 4mm thick, but it is expected to be thinned to about 2mm. The TOPLED Compact 4520 is designed to be able to reduce the LED backlights by measuring the dimensions of 4.5 mm long, 2.0 mm wide and 0.7 mm thick. The light-emitting spectrum of the white LED is adjusted to improve color expression and high luminous efficiency. The liquid crystal panel luminous efficiency when using the sRGB standard is 72 lm/W, and when the NTSC standard is 85%, it is 85 lm/W (driving current is When it is 150mA). Adopted the LED chip technology "UX:3" from OSRAM to increase the driving current luminous efficiency and not easy to reduce.
A weak electrical cable is a cable used for security communications, electrical equipment, and related weak electrical transmissions.
Wire and cable refers to materials used in power, communications, and related transmission applications. There are no strict boundaries between "wires" and "cables." Generally, a product with a small number of cores, a small product diameter, and a simple structure is called a wire, a non-insulated wire is called a bare wire, and the other is called a cable; a conductor having a large cross-sectional area (greater than 6 square millimeters) is called a large wire. Small (less than or equal to 6 square millimeters) is called a small wire, and insulated wire is also called a wire.
Wire and cable mainly includes bare wires, electromagnetic wires and insulated wires for electrical appliances, power cables, communication cables and optical cables.
composition
It consists of an inner conductor, an insulation, an outer conductor and a sheath from the inside out;
Inner conductor: Since the attenuation is mainly caused by the resistance of the inner conductor, the inner conductor has a great influence on the signal transmission.
Insulation: affects attenuation, resistance, return loss and other properties
Outer conductor: return conductor, shielding
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