Display method and device of dynamically controlling backlight

A display device, comprising:

• a backlight driving circuit;
• a processor, coupled to the backlight driving circuit and configured to execute instructions to perform operations of:
• normalizing a red (R) grayscale value, a green (G) grayscale value, and a blue (B) grayscale value of an obtained whole frame of an input image, and dividing the whole frame of the input image into a plurality of partitions;
• obtaining a normalized backlight output brightness value of each of the plurality of partitions by using the mean of a grayscale peak value of the input image and a brightness gain of the input image in each of the plurality of partitions;
• obtaining a modified grayscale value of the input image in each of the plurality of partitions by using a whole backlight reference value, the R, G, and B grayscale values and a white (W) grayscale value of the input image in each of the plurality of partitions, the normalized backlight output brightness value, and a spatial distribution function of the backlight brightness in each of the plurality of partitions wherein the RGB grayscale values of the input image are converted into the RGBW grayscale values of the input image by using the brightness gain;
• the whole backlight reference value is calculated based on the mean of the grayscale peak value of the whole frame of the input image;
• processing the normalized backlight output brightness value of each of the plurality of partitions to be a real backlight output brightness value;
• outputting the real backlight output brightness value to a backlight driving circuit;
• processing the modified grayscale value to be a real grayscale value and outputting the real grayscale value to a display panel for display;
• wherein the processor executes the instructions to calculate the whole backlight reference value BLUconst according to a formula:
• BLUconst=min(1,f(Lmean)),
• where BLUconst indicates the whole backlight reference value;
• Lmean indicates the mean of the grayscale peak value of the whole frame of the input image in each of the plurality of partitions;
• when Lmean≤GT stands, f(Lmean)=1 is true;
• when Lmean=1 stands, f(Lmean)=LT is true;
• when GT≤Lmean≤1 stands, f(Lmean)∈[LT,1] is true;
• f(Lmean)∈[LT,1] is the function Lmean of monotonical decrease;
• LT indicates a backlight brightness threshold value;
• GT indicates a threshold value of the mean of the grayscale peak value.

A display device comprising a storage storing instructions, the instructions executed by a processor to perform operations of:

• normalizing a red (R) grayscale value, a green (G) grayscale value, and a blue (B) grayscale value of an obtained whole frame of an input image, and dividing the whole frame of the input image into a plurality of partitions;
• obtaining a normalized backlight output brightness value of each of the plurality of partitions by using the mean of a grayscale peak value of the input image and a brightness gain of the input image in each of the plurality of partitions;
• obtaining a modified grayscale value of the input image in each of the plurality of partitions by using a whole backlight reference value, the R, G, and B grayscale values and a white (W) grayscale value of the input image in each of the plurality of partitions, the normalized backlight output brightness value, and a spatial distribution function of the backlight brightness in each of the plurality of partitions wherein the RGB grayscale values of the input image are converted into the RGBW grayscale values of the input image by using the brightness gain;
• the whole backlight reference value is calculated based on the mean of the grayscale peak value of the whole frame of the input image;
• processing the normalized backlight output brightness value of each of the plurality of partitions to be a real backlight output brightness value;
• outputting the real backlight output brightness value to a backlight driving circuit;
• processing the modified grayscale value to be a real grayscale value and outputting the real grayscale value to a display panel for display;
• wherein the instructions are executed by the processor to calculate the whole backlight reference value BLUconst according to a formula:
• BLUconst=min(1,f(Lmean)),
• where BLUconst indicates the whole backlight reference value;
• Lmean indicates the mean of the grayscale peak value of the whole frame of the input image in each of the plurality of partitions;
• when Lmean≤GT stands, f(Lmean)=1 is true;
• when Lmean=1 stands, f(Lmean)=LT is true;
• when GT≤Lmean≤1 stands, f(Lmean)∈[LT,1] is true;
• f(Lmean)∈[LT,1] is the function Lmean of monotonical decrease;
• LT indicates a backlight brightness threshold value;
• GT indicates a threshold value of the mean of the grayscale peak value.