TV, which is recognized by the world as one of the most important inventions of the twentieth century, is an indispensable tool for people to exchange information. Due to the popularity of television, consumers’ demand for traffic is increasing, and application services are changing with each passing day. The maximum power consumed to save energy is a key point for TV manufacturers to change. By applying the advanced driving technology of LEDs to TV backlight systems, consumers can provide completely different visual experiences and viewing qualities, thereby creating the value of communication services.
According to the California Energy Commission, today's TV consumes about 8-10% of the electricity consumption of a household. From this point of view, energy efficiency has clearly become one of the important design parameters of TV suppliers. Relevant specifications are bound to be more stringent.
In order to effectively reduce TV power consumption, manufacturers must meet the statutory energy efficiency benchmark, and the more feasible method is to use LED-backlit liquid crystal display (LCD) technology; other disadvantages such as plasma TV are that each pixel is an active light emitter. In addition, the energy consumption is proportional to the number of pixels, so at the same brightness and resolution, the high-quality plasma TV consumes an average of two to three times the energy of an LCD liquid crystal display.
The current new LED driver circuit design technology can effectively save the main power consumption, allowing TV manufacturers to meet the stringent power consumption requirements, but to achieve the necessary power consumption targets in the next few years, today's LED-backlit LCD TVs will still Faced with many difficulties.
TV power consumption standards are becoming stricter
First, the standard for TV power consumption is the "Energy Star" v3 version launched by the US Environmental Protection Agency in 2008. This version 4.0 is effective on May 1, 2010. This version not only reduces the power consumption limit by about 40. %, also specifies the upper limit of contrast power consumption at the highest brightness output, which can effectively prevent suppliers from misleading consumers. Then, the 5.3 version, which took effect on September 30, 2011, again reduced the power consumption limit. It can be seen that each time the newly revised legal provisions further reduce television energy consumption, it is a more serious challenge for manufacturers of large-size TVs.
However, the highly spontaneous and influential ENERGY STAR is not the only specification for TV power consumption. In fact, the California Energy Commission also implemented relevant effective standards from the beginning of 2011 to 2013, prohibiting TVs that do not meet the power consumption standards from being sold locally. In addition, Figure 1 shows the changes in TV power consumption standards and the actual power consumption of LG Cinema 3D TVs in 2011.
Figure 1 Schematic diagram of TV power consumption range
LED backlight division direct/indirect mode
30% to 70% of the energy of LED backlights comes from the power system of LCD LCD TVs. As with many traditional power system designs, as long as the energy consumption is gradually improved, it can be greatly improved. Therefore, improving the backlight power supply circuit can greatly improve the energy efficiency of the system.
LED backlighting has two application methods, as shown in Figure 2:
　　 Figure 2 LCD LCD TV can be used in two LED backlight design.
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