The invention discloses an array substrate, a liquid crystal display panel and a display device. At least one group of supplement storage capacitances parallelly connected with the storage capacitance, and switching elements corresponding to the supplement storage capacitances one by one are increased in each pixel structure. According to the working frequency needed by the array substrate, the connection relation of the supplement storage capacitances and the storage capacitance is adjusted so as to achieve the effect that the total storage capacitance in the pixel structure is adjusted for adapting the scanning frequency change. Specifically, the switching element can conduct the parallel connection of the supplement storage capacitances and the storage capacitance while the array substrate is operated in the first lower frequency, so that the total storage capacitance in the pixel structure is increased; and the switching element can break the parallel connection of the supplement storage capacitances and the storage capacitance while the array substrate is operated in the second higher frequency, so that the total storage capacitance in the pixel structure is reduced so as to improve the charging rate.