Driving method and driving circuit for backlight, backlight and display apparatus

A backlight, comprising a plurality of light-emitting elements a driving circuit and a control signal receiving terminal, wherein the backlight comprises a plurality of initial light-emitting regions, and each of the plurality of initial light-emitting regions comprises a part of the plurality of light-emitting elements, the driving circuit comprises:

• a brightness difference calculation sub-circuit, which is configured to calculate a brightness difference value of an image to be displayed, and the brightness difference value of the image to be displayed represents a brightness difference among all parts of the image to be displayed;
• a comparison sub-circuit, which is configured to compare the brightness difference value of the image to be displayed with a predetermined difference value of the image to generate a comparison result;
• an image partition sub-circuit, which is configured to divide the image to be displayed into a plurality of sub-regions such that the plurality of sub-regions are in one-to-one correspondence with the plurality of initial light-emitting regions, on the condition that the brightness difference value of the image to be displayed is greater than the predetermined difference value of the image;
• a backlight partition sub-circuit, which is configured to partition the backlight according to brightness difference values of the plurality of sub-regions to obtain a plurality of final light-emitting regions, such that the number of the plurality of final light-emitting regions corresponding to each sub-region is positively correlated to the brightness difference value of the sub-region;
• and
• a driving sub-circuit, which is configured to generate a partition control signal according to positions of the plurality of final light-emitting regions generated by the backlight partition sub-circuit and send the partition control signal to the backlight to drive the backlight to emit light according to the plurality of final light-emitting regions,
• wherein the control signal receiving terminal is electrically coupled to the driving sub-circuit,
• wherein the plurality of light-emitting elements of the backlight form a plurality of final light-emitting regions according to the partition control signal,
• wherein the backlight comprises a plurality of input terminals and a plurality of first switching circuits, and the partition control signal comprises a first switching control signal and a second switching control signal;
• each initial light-emitting region of the plurality of initial light-emitting regions comprises two or more light-emitting elements of the plurality of light-emitting elements, and corresponds to an input terminal of the plurality of input terminals, which supplies power to the two or more light-emitting elements in the initial light-emitting region, and a first switching circuit of the plurality of first switching circuits is provided between two adjacent initial light-emitting regions of the plurality of initial light-emitting regions;
• and
• the first switching circuit comprises a control terminal electrically coupled to the control signal receiving terminal, and is configured to cause the two adjacent initial light-emitting regions to be connected in series on the condition that the first switching control signal is received by the control terminal of the first switching circuit, and cause the two adjacent initial light-emitting regions to be disconnected from each other on the condition that the second switching control signal is received by the control terminal of the first switching circuit,
• wherein the backlight further comprises a plurality of second switching circuits, wherein the partition control signal comprises a third switching control signal and a fourth switching control signal;
• each of the initial light-emitting regions comprises a plurality of light-emitting circuits, each of which comprises at least one light-emitting element, and a second switching circuit of the plurality of second switching circuits is arranged between two adjacent light-emitting circuits in a same initial light-emitting region;
• and
• the second switching circuit comprises a control terminal electrically coupled to the control signal receiving terminal, and the second switching circuit is configured to cause the two adjacent light-emitting circuits to be connected in series on the condition that the third switching control signal is received by the control terminal of the second switching circuit, and cause the two adjacent light-emitting circuits to be connected in parallel on the condition that the fourth switching control signal is received by the control terminal of the second switching circuit.