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白光LED应用于LCD面板背光源越来越广泛,其驱动电路随着LCD面板尺寸的增大也相应发展。阐述了从小尺寸面板的驱动电路到大尺寸面板的驱动电路的进展,分析了现有主要应用电路的结构和工作原理。中小尺寸LCD面板中的背光源驱动电路已经发展成熟,它采用DCDC电源转换器与线性电流源相结合的电路结构;大尺寸LCD面板中的LED背光源驱动电路正在快速更新,围绕着提高电源转换效率和实现灵活准确调光的目标发展。
White LED backlighting used in LCD panels more and more widely, and its driver circuit with the LCD panel size also increased accordingly. The progress of the drive circuit from the small size panel to the large size panel is expounded. The structure and working principle of the main application circuits are analyzed. Backlight driver circuits in small and medium size LCD panels have matured, adopting a circuit structure combining a DCDC power converter with a linear current source; LED backlight driver circuits in large-size LCD panels are being rapidly updated to improve the power conversion Efficiency and achieve the target of flexible and accurate dimming development.