CN213152420U

CN213152420U - Backlight partition control circuit of LED module

Info

Publication number: CN213152420U
Application number: CN202022200837.4U
Authority: CN
Inventors: 吴聪堂; 黎旭; 吴俊恺
Original assignee: Guangxi Century Innovation Display Electronics Co Ltd
Current assignee: Guangxi Century Innovation Display Electronics Co Ltd
Priority date: 2020-09-30
Filing date: 2020-09-30
Publication date: 2021-05-07
Anticipated expiration: 2030-09-30

Abstract

The utility model relates to a backlight partition control circuit of LED module, including backlight control chip, backlight adjusting module, the backlight includes a plurality of LED lamp plates, backlight adjusting module includes the LED drive unit with LED lamp plate one-to-one, and control chip is respectively to a plurality of LED drive unit output control signal, and LED drive unit includes the LED drive chip of a plurality of built-in MOS pipes; because the built-in MOS pipe of LED driver chip, consequently can reduce the drive plate volume, can even with drive plate snap-on the lamp plate, can also prevent because the unstable phenomenon of circuit that MOS pipe rosin joint leads to can avoid ground wire interference, reduce the trouble possibility of LED module.

Description

Backlight partition control circuit of LED module

Technical Field

The utility model relates to a LED's control circuit technical field, more specifically say, relate to a LED module's subregion control circuit in a poor light, control up to 1152 LED lamp districts.

Background

The backlight adjusting chip adopted by the existing backlight adjusting scheme needs to be externally provided with an MOS (metal oxide semiconductor) tube, when the backlight adjusting chip is used, the single chip microcomputer MCU is connected with the LED driving chip through an SPI (serial peripheral interface) signal, the LED driving chip is connected with the external MOS tube, the conduction and the judgment of the MOS tube are controlled, and the on and the off of backlight are controlled; if MOSFET tube rosin joint, can lead to the circuit to work abnormally, the unstable phenomenon of good time bad appears, brings great hidden danger for debugging, use and the maintenance of circuit.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model lies in, to the above-mentioned defect of prior art, a subregion control circuit in a poor light of LED module is provided.

The utility model provides a technical scheme that its technical problem adopted is:

the backlight partition control circuit comprises a backlight source, a control chip, a backlight adjusting module and a power module, wherein the power module supplies power to the backlight source, the backlight source comprises a plurality of LED lamp panels, the backlight adjusting module comprises LED driving units in one-to-one correspondence with the LED lamp panels, the control chip is respectively multiple, the LED driving units output control signals, and each LED driving unit comprises a plurality of LED driving chips with built-in MOS tubes.

Preferably, the LED lamp panel comprises a plurality of LED subareas, the LED subareas form an LED subarea group, and the LED subarea group corresponds to the LED driving chips one to one.

Preferably, a plurality of current output channels are arranged on the LED driving chips, six LED driving units are specifically arranged, one LED driving unit is composed of four LED driving chips, and a plurality of LED subareas in one LED subarea group are connected with the corresponding LED driving chips.

Preferably, the control chip outputs a control signal to the LED driving chips through an SPI bus, and the LED driving chips are connected by a daisy chain type frame.

Preferably, a signal driving chip is arranged on an SPI bus between the control chip and the backlight adjusting module.

The beneficial effects of the utility model reside in that: the control chip sends the processed dimming control signal to the backlight adjusting module, the backlight adjusting module controls the backlight source according to the processed dimming control signal, the backlight adjusting module is composed of a plurality of LED driving units, the control chip respectively outputs the control signal to the plurality of LED driving units and individually controls each LED driving unit to realize the control of the LED lamp panel of the backlight source; because the built-in MOS pipe of LED driver chip, consequently can reduce the drive plate area, can even with drive plate snap-on the lamp plate, can also prevent because the unstable phenomenon of circuit that MOS pipe rosin joint leads to can avoid ground wire interference, reduce the trouble possibility of LED module.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the present invention will be further described with reference to the accompanying drawings and embodiments, wherein the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive efforts according to the drawings:

fig. 1 is a schematic diagram of an overall module of a backlight partition control circuit of an LED module according to a preferred embodiment of the present invention;

fig. 2 is a connection diagram of the LED lamp panel and the LED driving unit of the backlight partition control circuit of the LED module according to the preferred embodiment of the present invention;

fig. 3 is a circuit diagram of an LED driving chip of the backlight partition control circuit of the LED module according to the preferred embodiment of the present invention;

fig. 4 is a circuit diagram of a control chip of the backlight partition control circuit of the LED module according to the preferred embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, a clear and complete description will be given below with reference to the technical solutions of the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, belong to the scope of protection of the present invention.

The utility model discloses the subregion control circuit in a poor light of LED module of preferred embodiment is shown in fig. 1, refer to fig. 2-4, including backlight 1, control chip U1 and backlight adjusting module 2, backlight 1 includes a plurality of LED lamp plates 11, backlight adjusting module 2 includes the LED drive unit 21 with LED lamp plate 11 one-to-one, control chip U1 is to a plurality of LED drive unit 21 output control signal respectively, LED drive unit 21 includes the LED drive chip U2 of a plurality of built-in MOS pipes, the model of control chip U1 is M481 LIDA;

specifically, the control chip U1 receives a dimming control signal sent by the display chip, and then sends the processed dimming control signal to the backlight adjusting module 2, the backlight adjusting module 2 controls the backlight source 1 according to the processed dimming control signal, the backlight adjusting module 2 is composed of a plurality of LED driving units 21, the control chip U1 outputs control signals to the plurality of LED driving units 21 respectively, and controls each LED driving unit 21 individually, thereby realizing the partition control of the backlight source 1; because the LED driving chip U2 is internally provided with the MOS tube, the area of the driving board can be reduced, and even the driving board can be directly fixed on the lamp panel;

m481 LIDA's stable performance, processing speed is fast, and of course, control chip U1 still can adopt other to realize the utility model discloses the chip of function, the utility model discloses do not limit to this.

As shown in fig. 2, the LED lamp panel 11 includes a plurality of LED partitions 111, the LED partitions 111 form an LED partition group 112, and the LED partition group 112 corresponds to the LED driving chips U2 one by one;

as shown in fig. 3, the number of the LED driving units 21 is six, one LED driving unit 21 is composed of four LED driving chips U2, and the plurality of LED sub-areas 111 in one LED sub-area group 112 are all connected to the corresponding LED driving chip U2; specifically, the LED driver chip U2 model is MBI6328, and MBI6328 has forty-eight output channel, can control forty-eight LED subregion 111, and every LED drive unit 21 includes four LED driver chip U2, therefore specifically has 192 LED subregion on the LED lamp plate 11, and LED drive unit 21 has six, consequently the utility model discloses a LED module can control LED subregion quantity and reach 1152 as much.

As shown in fig. 1, the control chip U1 outputs a control signal to the LED driving chip U2 through the SPI bus, and the LED driving chips U2 are connected by a daisy chain architecture;

the control chip U1 outputs gclk clock signals and vsync field synchronization signals to the plurality of LED drive chips U2, CLK and CS in SPI communication between the control chip U1 and the LED drive chip U2 are shared, and the remaining transmitted data are transmitted in a serial connection manner, specifically, the SDI terminal of the control chip U1 is connected to the SDI terminal of the first LED drive chip U2, the SDI terminal of the first LED drive chip U2 is connected to the SDO terminal of the second LED drive chip U2, and so on, the SDI terminal of the last LED drive chip U2 is connected to the SDO terminal of the control chip U1, that is, data is transmitted from the control chip U1 to the first LED drive chip U2, then from the first LED drive chip U2 to the second LED drive chip U2, and so on, and finally transmitted to the last LED drive chip U2.

As shown in fig. 1, a signal driving chip U3 is disposed on the SPI bus between the control chip U1 and the backlight adjustment module 2; the control signal that signal driver chip U3 can export control chip U1 carries out the signal enhancement, signal driver chip U3's model can be SN74LV54, still can adopt other to realize the utility model discloses the chip of function, the utility model discloses do not restrict to this.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are considered to be within the scope of the invention as defined by the following claims.

Claims

1. The utility model provides a subregion control circuit in a poor light of LED module, its characterized in that, includes backlight, control chip, adjusting module in a poor light, the backlight includes a plurality of LED lamp plates, adjusting module in a poor light include with the LED drive unit of LED lamp plate one-to-one, control chip is respectively a plurality of LED drive unit output control signal, LED drive unit includes the LED drive chip of a plurality of built-in MOS pipes.

2. The backlight partition control circuit of the LED module of claim 1, wherein the LED lamp panel comprises a plurality of LED partitions, the plurality of LED partitions form an LED partition group, and the LED partition group corresponds to the LED driving chips one to one.

3. The backlight partition control circuit of the LED module according to claim 2, wherein the number of the LED driving units is six, one LED driving unit is composed of four LED driving chips, and a plurality of the LED partitions in one LED partition group are connected to the corresponding LED driving chips.

4. The LED module backlight partition control circuit according to claim 1, wherein the control chip outputs control signals to the plurality of LED driving chips through an SPI bus, and the plurality of LED driving chips are connected with each other by a daisy chain type framework.

5. The LED module backlight partition control circuit according to claim 4, wherein a signal driving chip is disposed on the SPI bus between the control chip and the backlight adjusting module.