Partitioned dimming method of light valve assembly based on LED backlight

The invention relates to a partition dimming method of a light valve assembly based on LED backlight. A plurality of high-power LED lamp beads are used as backlight of the LCD; light emitted by each LED is limited in a rectangular partition and corresponds to M * N pixels; each pixel is provided with C sub-pixels, each sub-pixel generates one primary color of one pixel, and the luminous flux of each sub-pixel is controlled by a light valve; the brightness of each LED lamp bead is independently controlled by the controller, and the light source is a white light LED; the maximum gray-scale value of the light valve is set as G, and the maximum brightness value of the LED is set as L; the controller searches the maximum gray-scale value g of each primary color in the image to be displayed in the partition; adjusting the brightness of the LED to L * g/G; the gray scale of each light valve is adjusted to be gxco = gxci * G/g, the subscript x is the serial number of the pixel, the subscript c is the serial number of