Mobile phone LED backlight power management design (below) Mobile phone backlighting is one of the largest application markets for LEDs today. As the market is already saturated, the price decline is obvious. Although the sales volume continues to increase, the sales amount has not grown significantly. Despite this, the backlighting application of 5 to 10 mobile phone devices will continue to be a new driving force for the market. What is the difference in power management requirements for these applications? David Brown: The power management needs of these various applications are very different, and each specific device design structure has its own unique needs. For each device, the designer must consider the battery type, screen size, and number of backlight LEDs used. After understanding the system requirements, we must also weigh the structure of the LED driver circuit, as well as the cost and complexity of the device, to achieve a balance. All of the above factors are sufficient to determine the best way to drive a backlight LED on a portable device. The LED backlight structure is mainly divided into two types, a single series series power supply or a plurality of series serial/parallel power sources. Although a single series of series power supplies uses a lower constant current, the input power supply must be boosted to meet the total forward voltage level of the series power supply to drive the LEDs. Conversely, multiple sets of series/parallel LED power supplies require a higher constant current to drive, but reduce the need for high voltages. The difference in boost converter requirements depends on cost, complexity, and energy conversion efficiency (for the user, the battery life between charge cycles). Ultimately, the best solution will be determined based on the product's product characteristics, size and performance requirements.
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The following exclusive interview with Adobe Magazine, Director of Application Engineering at AnalogicTech, discusses the power management design needs for LED backlighting.
What are the application methods for TFT LCD screens ranging in size from 5 to 10 inches?
David Brown: TFT LCD screens are available in a variety of applications, including high-end smartphones, small portable multimedia players (PMPs, such as small DVD players, typically 5 to 9 inches), and handheld portable navigation devices ( PND), laptops, small notebooks, tablet computers, handheld video games and e-book readers.
Standard wall mount enclosure is mainly used for connecting the indoor/outdoor optical cables, patch cords and pigtails. It can be wall mounted or pole mounted and provides various accessories to avoid any unexpected damage to the fiber. This types of fiber termiantion box as distribution box, it is usually used in between wiring closets and equipment for fiber optic cable termination, use and management.