Power supply circuit, LCD driver IC, LCD driver circuit, and liquid crystal display device

摘要

A power supply circuit is provided with a temperature gradient variable circuit that produces a gradient voltage whose voltage level varies with a temperature gradient commensurate with the ambient temperature and a temperature gradient setting circuit that produces an output voltage (and hence a drive voltage of an LCD panel) by adjusting the temperature gradient and the voltage level of the gradient voltage. With this configuration, it is possible to supply the optimal drive voltage despite variations in the ambient temperature or variations in characteristics of LCD panels.