Liquid crystal display screen, backlight circuit and backlight driving method thereof

Abstract

The invention relates to a liquid crystal display screen, a backlight circuit and a backlight driving method thereof, the backlight circuit comprises a plurality of data signal lines for accessing scanning signals; the plurality of scanning signal lines are used for accessing data signals; the plurality of emission control signal lines are used for accessing emission control signals; the light-emitting units are arranged in an array, each light-emitting unit comprises 2n light-emitting elements, and n is larger than or equal to 1; and a plurality of light-emitting drive circuits, wherein eachlight-emitting element is connected with one light-emitting drive circuit. Each light-emitting drive circuit is connected with one data signal line, one scanning signal line and one emission control signal line. The light-emitting driving circuit is used for accessing a scanning signal and a data signal to control the light-emitting time of the light-emitting element; and the control unit is usedfor accessing an emission control signal to control the enabling or closing of each light-emitting element in each light-emitting unit, and the gray scale number of the display screen can be increasedby segmenting the light-emitting time and combining the selection of the light-emitting area.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a liquid crystal display screen, a backlight circuit and a backlight driving method thereof. Background technique [0002] Local Dimming is to divide the image display area into multiple blocks, and adjust the brightness of the backlight according to each block according to the image signal. The backlight is usually composed of light-emitting diodes (LED for short), and the The driving circuit is used to adjust the brightness of the LED. [0003] At present, a dual-tube light-emitting drive circuit is usually used to control the light-emitting diode. The light-emitting time of the light-emitting diode determines the size of the gray scale. Usually, the longer the light-emitting time, the higher the brightness and the higher the gray scale. A transistor in the double-tube light-emitting drive circuit is used To address, another transistor is used to supply current to the LED. A...

AI Technical Summary

Problems solved by technology

It is difficult to achieve a higher level of grayscale display by further dividing the luminous time, because the human visual system is not sensitive to fast bright and dark flickering, so it cannot distinguish grayscale

And if the refresh rate increases, the time of each frame will become shorter and shorter, and the method of dividing the light-emitting time will make it more difficult for the visual system to distinguish grayscale

Therefore, it is difficult to divide the luminous time into so many levels of gray scales, and it is also difficult to achieve fine control of gray scales at a high refresh rate of the display.

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