Display driving device, display driving method, display module and display device

A display driving device, comprising:

• a Pulse Width Modulation (PWM) signal generating circuit configured to generate a PWM signal;
• a PWM signal acquisition circuit, connected to a PWM signal generating circuit, and configured to identify whether a PWM signal output by the PWM signal generating circuit is at a high level or a low level;
• a gamma voltage debugging circuit, configured to debug a gamma voltage to obtain a first group of gamma voltage reference data corresponding to the PWM signal at the high level and a second group of gamma voltage reference data corresponding to the PWM signal at the low level in each gray-scale image in a case that an actual voltage value of a pixel voltage corresponding to the PWM signal at the high level is the same with an actual voltage value of the pixel voltage corresponding to the PWM signal at the low level;
• and
• a gamma voltage switching circuit, connected to the PWM signal acquisition circuit, the PWM signal generating circuit and the gamma voltage debugging circuit, and configured to store the first group of gamma voltage reference data and the second group of gamma voltage reference data, output the first group of gamma voltage reference data to a source driver in a case that the PWM signal acquisition circuit determines that the PWM signal is at the high level, and output the second group of gamma voltage reference data to the source driver in a case that the PWM signal acquisition circuit determines that the PWM signal is at the low level.