Abstract: Provided are LED-display-screen drive chip and LED display screen, wherein the drive chip is configured such that: when a grayscale value R of a grayscale data is less than or equal to Q, the grayscale data is allocated to one display group in M display groups; and when the grayscale value R of the grayscale data is larger than Q, the grayscale value of one display group of the M display groups is P, wherein P>=Q, and a total grayscale value of remaining M?1 display groups is R?P, wherein in display groups in the remaining M?1 display groups whose grayscale value is not 0, a number of display groups whose grayscale value is less than L is not more than 1, wherein L?1, Q>L, and Q is a centralized display threshold. The present disclosure is capable of making the low-grayscale display effect smoother and improving the display effect.

Abstract: Disclosed is a brightness adjustment method, a device and a display apparatus. The method comprises: acquiring a brightness adjustment instruction and a target display brightness value of a display panel, a display brightness value representing backlight brightness of the display panel; adjusting a duty cycle of the light-emitting control signal based on the target display brightness value of the display panel; driving LEDs of a corresponding row in a backlight source to emit light by the adjusted light-emitting control signal. Each time the duty cycle of the light-emitting control signal needs to be adjusted, a duty cycle of each pulse cycle of a part of N pulse cycles of the light-emitting control signal is selected for corresponding adjustment, thus backlight brightness adjustment accuracy of the display panel is effectively improved, and an adjustable range of backlight brightness of the display panel is wider.

Abstract: Provided are LED-display-screen drive chip and LED display screen, wherein the drive chip is configured such that: when a grayscale value R of a grayscale data is less than or equal to Q, the grayscale data is allocated to one display group in M display groups; and when the grayscale value R of the grayscale data is larger than Q, the grayscale value of one display group of the M display groups is P, wherein P>=Q, and a total grayscale value of remaining M?1 display groups is R?P, wherein in display groups in the remaining M?1 display groups whose grayscale value is not 0, a number of display groups whose grayscale value is less than L is not more than 1, wherein L?1, Q>L, and Q is a centralized display threshold. The present disclosure is capable of making the low-grayscale display effect smoother and improving the display effect.

Abstract: Provided are decoupling circuit, driving IC, and display device. The decoupling circuit includes pre-charging module and constant current driving module, an output terminal of the pre-charging module and an output terminal of the constant current driving module are connected together to serve as a channel output terminal; within one display unit, when PWM is greater than 0, operation states of the pre-charging module are pre-charging V1, pre-charging off, and pre-charging V2 in sequence, the constant current driving module is turned on based on PWM in stage of the pre-charging off, such that a lamp bead is lit, and at this time, voltage at the channel output terminal is V3; when the PWM is equal to 0, the constant current driving module is turned off, and output states of the pre-charging module are pre-charging V4, pre-charging V5, and pre-charging V6 in sequence, (V1?V3)?(V4?V5)=K1, (V2?V3)?(V6?V5)=K2, K1 and K2 are constants.

Abstract: Disclosed is a brightness adjustment method, a device and a display apparatus. The method comprises: acquiring a brightness adjustment instruction and a target display brightness value of a display panel, a display brightness value representing backlight brightness of the display panel; adjusting a duty cycle of the light-emitting control signal based on the target display brightness value of the display panel; driving LEDs of a corresponding row in a backlight source to emit light by the adjusted light-emitting control signal. Each time the duty cycle of the light-emitting control signal needs to be adjusted, a duty cycle of each pulse cycle of a part of N pulse cycles of the light-emitting control signal is selected for corresponding adjustment, thus backlight brightness adjustment accuracy of the display panel is effectively improved, and an adjustable range of backlight brightness of the display panel is wider.