Driving IC, OLED display panel and display device

The embodiment of the invention provides a driving IC, an OLED display panel and a display device, relates to the technical field of display, and solves the problem of short-term residual images underhigh contrast. The driving IC comprises a gamma voltage generation unit, a gray scale voltage generation unit and a processing unit; the gamma voltage generation unit is connected with the high voltage end and the low voltage end and generates N gamma reference voltages according to the high voltage input by the high voltage input end and the low voltage input by the low voltage input end, and each gamma reference voltage is output by one gamma reference voltage output end in one-to-one correspondence; the gray scale voltage generation unit is connected with the N gamma reference voltage output ends, data voltage of M + 1-th gray scales is generated according to the N gamma reference voltage, and the data voltage of 0 to Mth gray scales is output from the 0-Mth gray scale voltage output end which are in one-to-on