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液晶显示器在信息显示技术中得到了越来越广泛的应用。作为液晶显示的主要部分之一的电源电路，直接控制提供给液晶驱动芯片的偏压。电源电路的电压的高低将直接影响液晶显示器的灰度调整和对比度的变化。ＭＡＸ６８６是Ｍａｘｉｍ公司生产的用于提供液晶偏压的电源器件。ＭＡＸ６８６能够转换液晶所需的正极性或负极性偏压的集成电路，有很强的灵活性，其内部有６ｂｉｔ的数模转换器．可用数字方式调整输出电压。因此，可以很方便地用软件或硬件来调整输出电压。ＭＡＸ６８６的高集成度为其节省了体积，减小了功耗，增加了电池的寿命，使其非常适用于电池供电的便携式仪器中。
Liquid crystal display in the information display technology has been more widely used. The power supply circuit, which is one of the main parts of the liquid crystal display, directly controls the bias voltage supplied to the liquid crystal driving chip. The voltage level of the power supply circuit will directly affect the LCD display gray-scale adjustment and contrast changes. The MAX686 is a power supply device manufactured by Maxim and used to provide liquid crystal bias. The MAX686 integrates a positive or negative bias voltage for LCDs and has the flexibility of a 6bit digital-to-analog converter. Digitally adjust the output voltage. Therefore, it is easy to adjust the output voltage with software or hardware. The high level of integration of the MAX686 saves volume, reduces power consumption and increases battery life, making it ideal for battery-operated portable instruments.