Backlight driving method, display driving method, drive device and display device

A drive device, applicable to a display panel and a backlight unit for the display panel, wherein

• the display panel comprises a plurality of display blocks arranged in an array,
• the backlight unit comprises a plurality of backlight blocks arranged in an array, a plurality of switching channels and a plurality of output channels,
• the plurality of backlight blocks are configured to respectively and correspondingly provide display light for the plurality of display blocks,
• the plurality of backlight blocks comprise a plurality of rows of backlight blocks, the plurality of switching channels are respectively connected with the plurality of rows of backlight blocks, and the plurality of switching channels are configured to respectively and correspondingly provide first driving signals for the plurality of rows of backlight blocks under control of switching control signals;
• the plurality of backlight blocks comprise a plurality of columns of backlight blocks, the plurality of output channels are respectively connected with the plurality of columns of backlight blocks, and the plurality of output channels are configured to respectively and correspondingly provide second driving signals for the plurality of columns of backlight blocks under control of output control signals;
• the plurality of backlight blocks are configured to emit light under control of the switching control signals and the output control signals of a same frame;
• the drive device comprises:
• a backlight data obtaining unit and a backlight control unit,
• wherein the backlight data obtaining unit is configured to obtaining a frame of backlight data according to image information of a frame of display image, the frame of backlight data comprises a plurality of first control signals which are respectively applied to the plurality of switching channels and serve as the switching control signals, and comprises a plurality of second control signal groups respectively corresponding to the plurality of first control signals, each of the plurality of second control signal groups comprises a plurality of second control signals which are respectively applied to the plurality of output channels and serve as the output control signals, and the plurality of first control signals are modulated non-constant width pulse signals respectively;
• and
• the backlight control unit is configured to receive the frame of backlight data and to drive the backlight unit to emit light by using the plurality of first control signals and the plurality of second control signal groups included in the frame of backlight data;
• wherein the driving the backlight unit to emit light by using the plurality of first control signals and the plurality of second control signal groups comprises:
• applying, during a scanning cycle corresponding to the frame of backlight data, the plurality of first control signals to the plurality of switching channels sequentially;
• and
• applying, during a time period of applying each of the plurality of first control signals, the plurality of second control signals in a second control signal group corresponding to the each of the plurality of first control signals to the plurality of output channels;
• wherein a starting time point of each of the plurality of first control signals is fixed, a first time interval between the starting time points of adjacent first control signals is equal, and the first time interval is greater than a maximum pulse width of the plurality of first control signals, a count of the plurality of switching channels is N, the first time interval is less than or equal to 1/N of a time duration of the scanning cycle, and N is an integer greater than 1;
• or,
• a starting time point of the first control signal of a first switching channel is fixed, and except for the first switching channel, a second time interval between a starting time point of the first control signal of each of the remaining switching channels and an ending time point of the first control signal of a previous switching channel related to the each of the remaining switching channels is equal.

A drive device, applicable to a display panel and a backlight unit for the display panel, wherein

• the display panel comprises a plurality of display blocks arranged in an array,
• the backlight unit comprises a plurality of backlight blocks arranged in an array, a plurality of switching channels and a plurality of output channels,
• the plurality of backlight blocks are configured to respectively and correspondingly provide display light for the plurality of display blocks,
• the plurality of backlight blocks comprise a plurality of rows of backlight blocks, the plurality of switching channels are respectively connected with the plurality of rows of backlight blocks, and the plurality of switching channels are configured to respectively and correspondingly provide first driving signals for the plurality of rows of backlight blocks under control of switching control signals;
• the plurality of backlight blocks comprise a plurality of columns of backlight blocks, the plurality of output channels are respectively connected with the plurality of columns of backlight blocks, and the plurality of output channels are configured to respectively and correspondingly provide second driving signals for the plurality of columns of backlight blocks under control of output control signals;
• the plurality of backlight blocks are configured to emit light under control of the switching control signals and the output control signals of a same frame;
• the drive device comprises:
• a backlight data obtaining unit and a backlight control unit,
• wherein the backlight data obtaining unit is configured to obtaining a frame of backlight data according to image information of a frame of display image, the frame of backlight data comprises a plurality of first control signals which are respectively applied to the plurality of switching channels and serve as the switching control signals, and comprises a plurality of second control signal groups respectively corresponding to the plurality of first control signals, each of the plurality of second control signal groups comprises a plurality of second control signals which are respectively applied to the plurality of output channels and serve as the output control signals, and the plurality of first control signals are modulated non-constant width pulse signals respectively;
• and
• the backlight control unit is configured to receive the frame of backlight data and to drive the backlight unit to emit light by using the plurality of first control signals and the plurality of second control signal groups included in the frame of backlight data;
• wherein the drive device further comprises a display data obtaining unit, the backlight data obtaining unit comprises a second control signal obtaining unit and a first control signal obtaining unit;
• the display data obtaining unit is configured to obtain, according to the image information of the frame of display image, a frame of display data which comprises display data of the plurality of display blocks, and to obtain, according to display data of the plurality of display blocks, grayscale distribution information of each of the plurality of display blocks;
• the second control signal obtaining unit is configured to obtain, according to the grayscale distribution information of each of the plurality of display blocks, a second control signal of a backlight block corresponding to this display block, and to obtain, according to a plurality of second control signals of each row of backlight blocks, a second control signal group corresponding to the each row of backlight blocks;
• and
• the first control signal obtaining unit is configured to obtain a pulse width of the first control signal of each of the switching channels according to pulse widths of the plurality of second control signals in the second control signal group corresponding to the each row of backlight blocks.