CN215770459U

CN215770459U - Backlight screen control device

Info

Publication number: CN215770459U
Application number: CN202121118400.4U
Authority: CN
Inventors: 文建邦
Original assignee: Goertek Inc
Current assignee: Goertek Inc
Priority date: 2021-05-24
Filing date: 2021-05-24
Publication date: 2022-02-08
Anticipated expiration: 2031-05-24

Abstract

The utility model discloses a backlight screen control device, which comprises: the power supply module comprises a boosting power supply chip and a voltage reduction power supply chip; the driving module is connected with the power supply module; the control module is connected with the driving module; the driving module is connected with the LED array by using a plurality of switch units; the boost power supply further comprises a capacitor, one end of the capacitor is connected into the output end of the boost power supply chip, and the other end of the capacitor is grounded. The utility model changes the traditional scheme of backlight and light-equalizing plate, and uniformly distributes the LED array on the back of the screen, and realizes the control of on and off of each LED lamp bead through the control module; and control of local brightness. Therefore, the contrast ratio of the backlight screen is increased, and the power consumption is saved; in addition, the capacitor is added in the power supply module, so that the influence of the utility model on the power supply in the use process is solved, and the power supply voltage is prevented from dropping in the initial use process; and stable operation of the system is realized.

Description

Backlight screen control device

Technical Field

The utility model relates to the technical field of backlight display, in particular to a backlight screen control device.

Background

The LED light source is energy-saving and environment-friendly, and has been widely applied in the fields of illumination and the like, liquid crystal display backlight screens and the like; the backlight screen gradually enters into industrialized production, and the backlight of the LCD screen is basically formed by a back light strip and a light homogenizing plate at present. Because the backlight screen has larger power consumption, when the backlight screen needs to be opened, a large current appears instantly, so that the power supply voltage of the backlight screen drops greatly, and the working stability of a system is influenced; in addition, the brightness of each LED lamp bead cannot be accurately controlled.

In summary, it is necessary to design a backlight control device to solve the problem of voltage drop caused by large current when the backlight is turned on in the prior art.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems in the prior art, the utility model provides a backlight screen control device which can locally control a backlight screen and improve the contrast; and simultaneously, the problem of voltage drop caused by large current when the backlight screen is opened is solved.

In order to achieve the purpose, the utility model adopts the following technical scheme:

a backlight screen control apparatus comprising:

the power supply module comprises a boosting power supply chip and a voltage reduction power supply chip;

the driving module is connected with the power supply module;

the control module is connected with the driving module;

the driving module is connected with the LED array by using a plurality of switch units;

the boost power supply further comprises a capacitor, one end of the capacitor is connected into the output end of the boost power supply chip, and the other end of the capacitor is grounded.

In some embodiments of the present invention, the LED array is an M × N array, that is, the LED lamp bead includes M rows and N columns.

In some embodiments of the present invention, the switching unit includes a first switching unit and a second switching unit; wherein the second switching unit performs a grounding process.

In some embodiments of the utility model, the first switching unit comprises M row switches; the second switching unit includes N column switches.

In some embodiments of the present invention, the row switch is used to control the turning on or off of each row of the LED array 700; the column switch is used for controlling the current output by each column of the LED array.

In some embodiments of the utility model, the number of capacitors is at least two; the capacitance of the capacitor is at least 100 muF.

In some embodiments of the present invention, the control module is connected to the driving module through an interface SPI.

In some embodiments of the utility model, the first switching unit employs a multiplexer.

In some embodiments of the present invention, the driving module is connected to the buck power chip.

In some embodiments of the present invention, the first switching unit is disposed at an input end of the LED array; the second switch unit is arranged at the output end of the LED array.

Compared with the prior art, the technical scheme of the utility model has the following technical effects:

the utility model changes the traditional scheme of backlight and light-equalizing plate, and uniformly distributes the LED array on the back of the screen, and realizes the control of on and off of each LED lamp bead through the control module; and control of local brightness. Therefore, the contrast ratio of the backlight screen is increased, and the power consumption is saved; in addition, the capacitor is added in the power supply module, so that the influence of the utility model on the power supply in the use process is solved, and the power supply voltage is prevented from dropping in the initial use process; and stable operation of the system is realized.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a backlight screen control device.

Reference numerals: 100-a boost power supply chip; 200-step-down power supply chip; 300-a first capacitance; 400-a second capacitance; 500-a control module; 600-a drive module; 610-a first switching unit; 620-second switching unit; 700-LED array.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected unless otherwise explicitly stated or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art. In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

Referring to fig. 1, a backlight screen control apparatus includes:

a power supply module including a boost power chip 100 and a buck power chip 200;

a driving module 600 connected to the power supply module;

a control module 500 connected with the driving module 600;

the driving module 600 is connected to the LED array 700 by using a plurality of switch units;

In the utility model, the LED array 700 is uniformly distributed behind the screen back, and the control on and off of each LED lamp bead is realized through the control module; and control of local brightness. Therefore, the contrast ratio of the backlight screen is increased, and the power consumption is saved; in addition, the capacitor is added in the power supply module, so that the influence of the utility model on the power supply in the use process is solved, and the power supply voltage is prevented from dropping in the initial use process; and stable operation of the system is realized.

In some embodiments of the present invention, the LED array 700 is an M × N array, that is, includes M rows and N columns of LED beads, which are distributed below the screen and are responsible for the backlight portion of the LCD screen; is different from the traditional LED lamp strip and light-equalizing structural part.

In some embodiments of the present invention, the boost power chip 100 and the buck power chip 200 constitute a power supply circuit of the backlight screen control device; when the LED array 700 is fully bright, the current is large, which causes an instantaneous voltage drop and causes an abnormal system operation. In the present embodiment, the voltage supplied by the system is first increased by the boost power supply chip 100, for example, the voltage may be first increased to 12V. Then, the buck power chip 200 is connected, which is responsible for converting the boosted 12V voltage into the voltage required by the LED array 700, which may be, for example, reduced to 6.3V.

In some embodiments of the present invention, the capacitors include a first capacitor 300 and a second capacitor 400, both in parallel; the input ends of the first capacitor 300 and the second capacitor 400 are both connected with the output end of the boost power supply chip 100; and the output ends of the two capacitors are grounded.

The first capacitor 300 and the second capacitor 400 are large-capacity capacitors, and are equivalent to an energy bank in the use process; the capacity is selected from 100 muF or 2200 muF; when power supply voltage boosts to 12V, the first capacitor 300 and the second capacitor 400 are charged, so that when the LED array 700 at the rear end needs to use electricity, the voltage reduction power supply chip 200 can firstly obtain power supply from the first capacitor 300 and the second capacitor 400 instead of instantly drawing the power supply of the voltage boosting power supply chip 100, thereby having a buffering effect on the power supply of the voltage boosting power supply chip 100, avoiding instantly drawing the power supply of the voltage boosting power supply chip 100 and causing the problem of severe drop of the power supply.

In some embodiments of the present invention, the driving module 600 is connected to the buck power chip 200, and is configured to receive a control command from the control module 500 to control the turning on or off of the LED array 700. The driving module 600 includes a first switching unit 610 and a second switching unit 620 in this embodiment; wherein the second switching unit 620 performs a grounding process.

Specifically, the first switching unit 610 is disposed at an input end of the LED array 700; the second switching unit 620 is disposed at an output end of the LED array 700; therefore, the first switch unit 610, the LED array 700 and the second switch unit 620 together form a complete current path.

In some embodiments of the present invention, the first switching unit 610 includes M row switches; the second switching unit 620 includes N column switches; the row switch is used for controlling the on or off of each row of the LED array 700; the column switch is used for controlling the current output by each column of the LED array.

Specifically, the number of switches in the first switching unit 610 is the same as the number of rows of the LED array 700; the number of switches in the second switch 620 is the same as the number of columns of the LED array 700. In some embodiments, each switch in the first switching unit 600 employs a multiplexer; each switch in the second switch unit 620 adopts a current sinking path, which can be finely controlled and can control the current, i.e., the brightness of the LED array 700. Therefore, in use, the driving module 600 may control the on or off of the M × N LED array 700 and control the brightness by using the first switch unit 610 and the second switch unit 620.

In some embodiments of the present invention, the driving module 600 further includes an LED array open and short circuit protection unit, an over-temperature protection unit, and the like. The control module 500 is connected to the driver module 600 via the interface SPI. Through the interface SPI, the control module 500 may control some of the LED lamps in the LED array 700 to be turned on or off, or change the brightness of some of the LED lamps, etc.

The working principle of the utility model is as follows:

the LED array 700 is a backlight source for the screen, and is uniformly distributed under the screen, and may be configured with a number of lamps balanced according to brightness and power consumption. Because the power consumption of the screen backlight is large, a large current appears instantly when the screen backlight is required to be turned on, so that the power supply voltage of the screen backlight drops greatly, and the working stability of a system is influenced. The utility model buffers the power supply of the system by firstly boosting and then reducing the voltage. The power supply is firstly boosted to 12V or other high level, then the capacitor is charged, and the capacitor needs to adopt 100uF or 220uF and can be optimized according to the design. The capacitor is equivalent to an energy bank, when the back-end LED array 700 needs to work, the power supply of the back-end LED array is obtained from the buck power chip 200, and the power supply of the buck power chip 200 is obtained from the capacitor, rather than instantly pulling the boost power chip 100. Therefore, the power supply of the boosting power supply chip 100 is buffered, and the problem that the power supply of the boosting power supply chip 100 is seriously dropped due to instantaneous power extraction of the boosting power supply chip is solved. In addition, the driving module 600 is a driving part of the LED array 700, which is composed of M multiplexers and N sink current paths. The driving module 600 controls the local lamps to be on or off and the brightness through the M multiplexers and the N current-sinking paths. Therefore, the contrast of the screen can be increased, and the switching-off or dimming processing is carried out when the local area does not need to be bright.

The screen backlight scheme changes the traditional backlight and uniform light plate scheme, and adopts the way that the LED arrays 700 are uniformly distributed behind the screen quilt, and the lamps can be controlled by the driving module 600 to realize the control of local brightness and the control of the on and off of the local lamps. Thereby increasing the contrast of the screen and saving power consumption. Meanwhile, the influence of the scheme on a power supply in the using process is solved, and the stable work of the system is realized.

In the foregoing description of embodiments, the particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.

The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A backlight screen control apparatus, comprising:

the driving module is connected with the power supply module;

the control module is connected with the driving module;

2. The backlight screen control device of claim 1, wherein the LED array is an M x N array, i.e. comprising M rows and N columns of LED beads.

3. The backlight screen control device of claim 1, wherein the switch unit comprises a first switch unit and a second switch unit; wherein the second switching unit performs a grounding process.

4. A backlight screen control device according to claim 3, wherein the first switch unit comprises M row switches; the second switching unit includes N column switches.

5. The backlight screen control device of claim 4, wherein the row switch is used for controlling the on or off of each row of the LED array; the column switch is used for controlling the current output by each column of the LED array.

6. The backlight screen control device of claim 1, wherein the number of capacitors is at least two; the capacitance of the capacitor is at least 100 muF.

7. The backlight screen control device according to claim 1, wherein the control module is connected to the driving module through an interface SPI.

8. The backlight screen control device of claim 1, wherein the first switch unit is a multiplexer.

9. The backlight screen control device of claim 1, wherein the driving module is connected to the buck power chip.

10. The backlight screen control device of claim 3, wherein the first switch unit is disposed at an input end of the LED array; the second switch unit is arranged at the output end of the LED array.