Backlight constant-current control circuit and backlight structure

Abstract

The invention discloses a backlight constant-current control circuit and a backlight structure. The backlight constant-current control circuit comprises a light-emitting module and a constant-currentcontrol module, wherein the constant-current control module comprises a voltage regulation unit and a feedback unit which are electrically connected; a feedback unit is electrically connected with theoutput end of the light-emitting module and is used for outputting a voltage regulation signal to the voltage regulation unit when the working current of the light-emitting module deviates from a preset current; and the voltage regulation unit is electrically connected with the input end of the light-emitting module and is used for adjusting the voltage of the input end of the light-emitting module according to the voltage regulation signal so as to adjust the working current of the light-emitting module to the preset current, so that the light-emitting brightness of the light-emitting moduleis kept at the preset light-emitting brightness. The current of the light-emitting module is kept at the preset current by performing constant-current control on the light-emitting module, so that uneven brightness caused by current fluctuation is avoided, and the backlight brightness stability is improved.

Description

technical field [0001] The present application relates to the field of display technology, in particular to the field of display driving technology, and in particular to a backlight constant current control circuit and a backlight structure. Background technique [0002] With the vigorous development of the information society and the increasingly mature driving technology of the panel industry, opportunities and challenges also follow. Due to the limitations of the LCD backlight, such as high power consumption and low contrast, the backlight is forced to move towards Local dimming ( locally controllable) direction. [0003] With the development of technology, Mini LED with an ultra-small process structure has been mass-produced in small batches. Due to the small structure of Mini LED, more partitions can be realized. Compared with traditional LCD display technology, Mini LED backlight has more backlight Partitioning makes the TV picture quality higher, lower energy consump...

AI Technical Summary

Problems solved by technology

[0004] The existing Mini LED backlight adopts the Local Dimming backlight realized by active addressing driver (AM: Active Matrix, also known as active addressing, active addressing, active driver, etc.), and each partition is connected in series by multiple LED lights Composition, using constant voltage control mode (that is, VDD voltage is fixed) to drive each partition to work, when an LED lamp in the circuit fails and short-circuits, the total resistance of the LED lamp string in the partition becomes smaller, because the voltage at both ends of the LED lamp string is not change, making the current of LED light strings in this partition larger, and LED lights are extremely sensitive to current, the display brightness of this partition will be greater than other partitions, or higher than the required brightness, resulting in uneven brightness of the entire backlight, which greatly affects the display effect

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