Voltage control circuit and power supply voltage control method, and display device

A power supply voltage control method for providing a power supply voltage for a display panel, wherein the display panel comprises a plurality of pixels, the plurality of pixels comprise a first pixel and a second pixel, the first pixel and the second pixel are pixels corresponding to different colors, and

• the method comprises:
• providing a first voltage to the first pixel and a second voltage to the second pixel at a first time and a second time, respectively,
• wherein the first voltage provided at the first time is different from the second voltage provided at the first time, and the first voltage provided at the second time is identical with the second voltage provided at the second time;
• and
• determining whether a display image of a current frame of the display panel is a risk image,
• wherein in response to the display image of the current frame is the risk image, the first time is within the current frame,
• wherein determining whether the display image of the current frame of the display panel is the risk image comprises:
• acquiring a first grayscale value of the display image of the current frame of the display panel and a second grayscale value of a display image of a previous frame of the display panel;
• and
• determining whether the display image of the current frame is the risk image according to the first grayscale value and the second grayscale value,
• wherein the plurality of pixels are divided into n display units, and
• the determining whether the display image of the current frame is the risk image according to the first grayscale value and the second grayscale value comprises:
• for the n display units, calculating n differences between first grayscale value of the display image of the current frame and second grayscale value of the display image of the previous frame, respectively;
• and
• in response to a number of differences greater than a preset difference among the n differences is greater than a preset value n*k, determining the display image of the current frame as the risk image, wherein n is an integer greater than ten thousand, and 0<k≤1.