CN112992081A - Backlight plate, display panel and control method of backlight plate - Google Patents

Backlight plate, display panel and control method of backlight plate Download PDF

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Publication number
CN112992081A
CN112992081A CN202110251520.XA CN202110251520A CN112992081A CN 112992081 A CN112992081 A CN 112992081A CN 202110251520 A CN202110251520 A CN 202110251520A CN 112992081 A CN112992081 A CN 112992081A
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China
Prior art keywords
sub
led
leds
area
backlight
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CN112992081B (en
Inventor
管恩慧
张晓�
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BOE Technology Group Co Ltd
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BOE Technology Group Co Ltd
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    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/3406—Control of illumination source
    • G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines

Abstract

The embodiment of the invention provides a backlight plate, a display panel and a control method of the backlight plate, wherein the backlight plate comprises a plurality of Light Emitting Diode (LED) areas, and the LED areas are connected in parallel, wherein: each LED region comprises a plurality of sub-regions which are connected in parallel; each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series. Thus, when the proportion of the white picture in the display picture is high and the driving current is I, the plurality of sub-regions are connected in parallel, and the sum of the currents of the plurality of sub-regions is I, so that the current passing through each LED is less than I, and the power consumption of each LED is less than (1-eta) I2R, it can be seen that under the condition of high white picture proportion, the power consumption of the backlight plate can be effectively reduced.

Description

Backlight plate, display panel and control method of backlight plate
Technical Field
The invention relates to the technical field of display, in particular to a backlight plate, a display panel and a control method of the backlight plate.
Background
LCDs (Liquid Crystal displays) are classified into two types, namely, CCFL (Cold Cathode Fluorescent Lamp) type and LED (Light Emitting Diode) type, according to the backlight source.
The LED has the excellent characteristics of small volume, high brightness and the like, so that the LED is adopted as a backlight source, and the light and thin property of the liquid crystal display can be considered, and meanwhile, the high brightness can be achieved. The backlight plate of the LED type liquid crystal display comprises a plurality of LED areas, each LED area comprises a plurality of LEDs connected in series, and the driving chip controls the LEDs in the LED areas to be turned on or off simultaneously according to display requirements.
When the white screen ratio in the display screen is high, the luminance of the backlight needs to be high, the driving current I is also high, the current passing through the LEDs included in each LED region is I, and the power consumption of each LED is P ═ 1- η) I2And R, wherein R is the resistance of the LED, and eta is the luminous efficiency of the LED. It can be seen that the power consumption of the backlight is very high in the case of a high white picture ratio.
Disclosure of Invention
Embodiments of the present invention provide a backlight panel, a display panel, and a method for controlling the backlight panel to reduce power consumption of the backlight panel. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a backlight plate, where the backlight plate includes a plurality of LED regions, and the LED regions are connected in parallel, where:
each LED region comprises a plurality of sub-regions which are connected in parallel;
each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series.
Optionally, each of the sub-regions includes the same number of LEDs;
the backlight plate further comprises a power supply and a driving chip, the power supply is electrically connected with the anode of the first LED connected in series in each sub-region, the driving chip is electrically connected with the cathode of the last LED connected in series in each sub-region, and the power supply is electrically connected with the driving chip.
Optionally, the number of LEDs included in the LED region is N2Wherein N is an even number.
Optionally, N is an even number from 4 to 10.
Optionally, the number of LEDs included in each sub-region is N.
Optionally, the LED area is a rectangle, N is 4, and 4 LEDs located at the vertex of the rectangle constitute a sub-area.
Optionally, the backlight plate further comprises a control switch;
the control switch is arranged between the driving chip and the cathode of the last LED connected in series in each sub-area, and the control switch is used for setting to be in a first switch state or a second switch state according to a control signal output by the driving chip;
the control switch is in the first switch state, the LEDs in part of the sub-areas are turned on, the control switch is in the second switch state, and the LEDs in all the sub-areas are turned on.
Optionally, the number of LEDs included in each sub-region is not exactly the same;
the backlight plate also comprises a plurality of power supplies and driving chips, the anode of the first LED connected in series in the first sub-area is electrically connected with the same power supply, the anode of the first LED connected in series in the second sub-area is electrically connected with different power supplies, the driving chips are respectively electrically connected with the cathode of the last LED connected in series in each sub-area, and each power supply is respectively electrically connected with the driving chips;
the first sub-area is a sub-area with the same number of included LEDs, and the second sub-area is a sub-area with a different number of included LEDs.
In a second aspect, an embodiment of the present invention provides a display panel, where the display panel includes the backlight panel described in any one of the first aspect above.
In a third aspect, an embodiment of the present invention provides a method for controlling a backlight plate, where the backlight plate includes a plurality of LED regions, the LED regions are connected in parallel, each LED region includes a plurality of sub-regions, and the sub-regions are connected in parallel; each subarea consists of a plurality of LEDs, and the LEDs included in each subarea are connected in series; the method comprises the following steps:
turning on LEDs included in a part of the sub-regions in the plurality of sub-regions under the condition that the driving current is not larger than a preset threshold value;
and turning on the LEDs included in all the sub-areas under the condition that the driving current is larger than the preset threshold value.
The embodiment of the invention has the following beneficial effects:
in the scheme provided by the embodiment of the invention, the backlight plate comprises a plurality of LED areas of light emitting diodes, and the LED areas are connected in parallel, wherein: each LED area comprises a plurality of sub-areas which are connected in parallel; each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series. Thus, when the proportion of the white picture in the display picture is high and the driving current is I, the plurality of sub-regions are connected in parallel, and the sum of the currents of the plurality of sub-regions is I, so that the current passing through each LED is less than I, and the power consumption of each LED is less than (1-eta) I2R, it can be seen that under the condition of high white picture proportion, the power consumption of the backlight plate can be effectively reduced. Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described 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 that other embodiments can be obtained by using the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a backlight plate according to an embodiment of the present invention;
FIG. 2 is a schematic view of another structure of the backlight plate according to the embodiment shown in FIG. 1;
FIG. 3(a) is a schematic structural diagram of a sub-region based on the embodiment shown in FIG. 1;
FIG. 3(b) is another structural diagram of a sub-region based on the embodiment shown in FIG. 1;
FIG. 3(c) is another structural diagram of a sub-region based on the embodiment shown in FIG. 1;
FIG. 4 is a schematic view of another structure of the backlight plate according to the embodiment shown in FIG. 1;
FIG. 5 is a schematic view of another structure of the backlight plate according to the embodiment shown in FIG. 1;
fig. 6 is a flowchart illustrating a method for controlling a backlight unit according to an embodiment of the present invention;
FIG. 7 is a graph illustrating a relationship between luminous efficiency and driving current of an LED.
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 from the embodiments given herein by one of ordinary skill in the art, are within the scope of the invention.
In order to reduce power consumption of the backlight plate, embodiments of the present invention provide a backlight plate, a display panel, and a method for controlling the backlight plate.
As shown in fig. 1, a backlight plate comprises a plurality of LED areas 100 of light emitting diodes, the LED areas 100 being connected in parallel, wherein:
each LED area 100 comprises a plurality of sub-areas 110, the plurality of sub-areas 110 being connected in parallel;
each sub-area 110 is composed of a plurality of LEDs 111, and the plurality of LEDs 111 included in each sub-area 110 are connected in series.
Therefore, in the scheme provided by the embodiment of the invention, the backlight plate comprises a plurality of Light Emitting Diode (LED) areas, and the LED areas are connected in parallel, wherein: each LED area comprises a plurality of sub-areas which are connected in parallel; each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series. Thus, when the proportion of the white picture in the display picture is high and the driving current is I, the plurality of sub-regions are connected in parallel, and the sum of the currents of the plurality of sub-regions is I, so that the current passing through each LED is less than I, and the power consumption of each LED is less than (1-eta) I2R, it can be seen that, in the case of a high white picture ratio,the power consumption of the backlight plate can be effectively reduced.
For the LED type backlight plate, especially the MINI-LED type backlight plate, under the condition that the white picture ratio in the display picture is high, the power consumption of each LED is large due to a large driving current I, which may cause the power consumption of the whole backlight plate to be large and the heat to be serious. Therefore, in order to reduce the power consumption of the backlight panel, embodiments of the present invention provide a backlight panel.
Referring to fig. 1, the backlight panel provided in the embodiment of the present invention includes a plurality of LED areas 100, and the LED areas 100 are connected in parallel, where the number of the LED areas may be determined according to the size of the display panel, the number of pixels, and other factors, and is not specifically limited herein, and may be, for example, 50, 80, 100, and the like.
Each LED area 100 includes a plurality of sub-areas 110, and the plurality of sub-areas 110 are connected in parallel, and a region surrounded by a dashed frame in fig. 1 represents one sub-area. Wherein each sub-area 110 is composed of a plurality of LEDs 111, and the plurality of LEDs 111 included in each sub-area 110 are connected in series. Thus, when the driving current I is inputted into each LED area 100, since the sub-areas 110 are connected in parallel, the sum of the currents passing through the sub-areas 110 is I, and the current passing through each sub-area 110 is smaller than I.
For example, assume that an LED region includes 4 sub-regions, each sub-region including 4 LEDs in series. When the driving current I is input into the LED area, the current passing through each subarea and comprising 4 LEDs connected in series is I/4, and the power consumption of each LED is P ═ 1-eta (I/4)2R＝(1-η)I2R/16, wherein R is the resistance of the LED, and eta is the luminous efficiency of the LED. Since the LED region comprises 16 LEDs in total, the overall power consumption is (1-eta) I2R/16×16＝(1-η)I2R。
If the arrangement of the LEDs in the backlight plate in the related art is adopted, and the LED area includes 4 LEDs, when the driving current I is input to the LED area, the current passing through each LED is I, and the power consumption of each LED is P ═ 1- η) I2R, the overall power consumption of the LED region is 4 (1-eta) I2And R is shown in the specification. It can be seen that the comparison of related artThe backlight plate provided by the embodiment of the invention can reduce the overall power consumption of each LED area to 1/4, thereby greatly reducing the overall power consumption of the backlight plate.
Meanwhile, whether the plurality of sub-regions are all started can be controlled according to actual display requirements, and only one or part of LEDs included in the sub-regions can be started under the condition that the display requirements require that the brightness of a display picture is not high, so that the overall power consumption of the backlight plate is further reduced.
The embodiment of the present invention provides a backlight plate, which includes a backlight plate, a first LED area, a second LED area, a third LED area, a fourth LED area, a fifth LED area, a sixth LED area, a seventh LED area, a sixth LED area, a seventh.
As an implementation manner of the embodiment of the present invention, each of the sub-regions includes the same number of LEDs. Accordingly, as shown in fig. 2, the backlight plate may further include a power supply 200 and a driving chip 300, the power supply 200 is electrically connected to the anode of the first LED connected in series in each sub-region 110, the driving chip 300 is electrically connected to the cathode of the last LED connected in series in each sub-region 110, and the power supply 200 is electrically connected to the driving chip 300.
In order to facilitate the arrangement of the power supply and the driving chip, the number of the LEDs included in each sub-area can be the same, and the voltage required to be applied to each sub-area is also the same, so that each sub-area can be supplied with the same power supply without arranging a plurality of power supplies for supplying power.
Specifically, the power supply may be electrically connected to the anode of the first LED connected in series in each sub-region, the driving chip may be electrically connected to the cathode of the last LED connected in series in each sub-region, and the power supply is electrically connected to the driving chip to form a loop.
In this embodiment, the first LED connected in series in each sub-area is controlled by the common anode, the cathode of the last LED connected in series in each sub-area is controlled by the driving chip, and the driving chip is used to control the LEDs included in each sub-area to be turned on or off according to the display requirement. Wherein, generally, each sub-region is controlled by one driving chip, that is, the number of driving chips is the same as the number of sub-regions.
It can be seen that, in this embodiment, the number of LEDs included in each sub-region may be the same, the power supply is electrically connected to the anode of the first LED connected in series in each sub-region, the driving chip is electrically connected to the cathode of the last LED connected in series in each sub-region, and the power supply is electrically connected to the driving chip.
As an implementation manner of the embodiment of the present invention, the number of LEDs included in the LED area is N2Wherein N is an even number.
Because each LED area corresponds to a certain number of pixel points, in order to adapt to the processing and calculation of the algorithm on the relation between the image and the brightness of the backlight plate and ensure the symmetry between the LEDs and the pixel points in the backlight plate, the number of the LEDs can be N2Such a square matrix. Wherein, N is the even number, can conveniently divide the corresponding relation between LED and the pixel in the board in a poor light like this, conveniently carries out the brightness control of board in a poor light.
Since the number of LEDs included in the LED area may affect the ease of wiring and determine the voltage required to be provided by the power supply, N may be an even number from 4 to 10 as an implementation manner of the embodiment of the present invention, so as to facilitate wiring and selection of a suitable power supply.
The number of the LEDs included in the LED area is not easy to be too large, and if the number of the LEDs included in the LED area is too large, the LED area is large in size, large in span, and difficult to wire, so that N may be an even number from 4 to 10, i.e., 4, 6, 8, and 10, which may facilitate the wire routing and selection of a suitable power source.
As an implementation manner of the embodiment of the present invention, the number of the LEDs included in each of the sub-areas is described aboveThe amount may be N. That is, each LED region includes N LEDs2And dividing the LED array into N sub-areas, wherein the number of the LEDs in each sub-area is N.
For example, the number of LEDs included in each LED region is 82In the case of (2), the sub-regions may be divided into 8, and the number of LEDs included in each sub-region is 8. The number of LEDs included in each LED region was 62In the case of (3), it may be divided into 6 sub-regions, and the number of LEDs included in each sub-region is 6.
As an implementation manner of the embodiment of the present invention, the LED area may be a rectangle, N may be 4, and 4 LEDs located at the vertex of the rectangle constitute one sub-area.
The LED areas arranged in a rectangular shape can be convenient for arranging each LED and determining the corresponding relation with the pixel points, so that the LED areas in the general backlight plate are rectangular. In one embodiment, N may be 4, and each LED region in the backlight plate includes N LEDs2Each LED area comprises 4 sub-areas, the number of LEDs comprised in each sub-area being 4.
In this case, 4 LEDs located at the vertex of the rectangle may form a sub-region, and when the LEDs are actually arranged, because a common LED arrangement manner in the related art is that 4 LEDs form an LED region, 12 LEDs may be added on the basis of the arrangement manner, each 4 of the 12 LEDs form 1 sub-region, and the original 4 LEDs form a sub-region, that is, 4 LEDs located at the vertex of the rectangle form a sub-region.
Assuming that the number of original LEDs is X, nX LEDs may be added, and (N +1) X ═ N is guaranteed2Wherein n is a positive integer. Thus, the backlight plate capable of reducing power consumption can be conveniently changed based on the original LED.
The sub-regions to which the other LEDs that are not located at the vertex of the rectangle belong may be partitioned in various ways, as long as it is ensured that each sub-region includes the same number of LEDs. In one embodiment, since the LEDs included in each sub-area need to be connected in series, the sub-areas to which the other LEDs belong can be determined in a manner that facilitates wiring.
As an embodiment, as shown in fig. 3(a), 4 LEDs located at the vertices of a rectangle constitute one sub-region; 4 LEDs positioned at the middle upper part of the rectangle form a sub-area; 2 LEDs positioned on the left side of the rectangle and 2 LEDs positioned on the left side of the middle lower part of the rectangle form a sub-region; the 2 LEDs on the right side of the rectangle and the 2 LEDs on the right side of the middle lower part of the rectangle form a sub-area.
As another embodiment, as shown in fig. 3(b), 4 LEDs located at the vertices of a rectangle constitute one sub-region; 4 LEDs positioned at the middle lower part of the rectangle form a sub-area; 2 LEDs positioned on the left side of the rectangle and 2 LEDs positioned on the left side of the middle upper part of the rectangle form a sub-region; the 2 LEDs on the right side of the rectangle and the 2 LEDs on the right side of the middle upper part of the rectangle form a sub-area.
As another embodiment, as shown in fig. 3(c), 4 LEDs located at the vertices of a rectangle constitute one sub-region; 4 LEDs positioned in the middle of the rectangle form a sub-region; 2 LEDs on the left side of the rectangle and 2 LEDs on the upper side of the rectangle form a sub-region; the 2 LEDs on the right side of the rectangle and the 2 LEDs on the right side of the lower side of the rectangle constitute one sub-area.
It can be seen that, in this embodiment, each LED region may be a rectangle, N may be 4, and 4 LEDs located at the vertex of the rectangle constitute one sub-region. Therefore, the LED can be conveniently arranged on the basis of the original LED wiring and power supply, and the cost can be reduced and the operation is convenient.
In order to reduce the number of driving chips, as an implementation manner of the embodiment of the present invention, as shown in fig. 4, the backlight plate may further include a control switch 400;
the control switch 400 is disposed between the driving chip 300 and the cathode of the last LED connected in series in each sub-area 110, and the control switch 400 is configured to be set to a first switching state or a second switching state according to a control signal output by the driving chip 300.
In one embodiment, the control switch may be a Metal-Oxide-Semiconductor Field-Effect Transistor (mosfet) switch. And under the condition that the control switch is in the first switch state, the LEDs included in part of the sub-regions are turned on, and under the condition that the control switch is in the second switch state, the LEDs included in all the sub-regions are turned on.
Under the condition that the brightness requirement of the display picture is low, the brightness requirement can be met without all the LEDs being turned on, so that the control switch is in a first switch state by the control signal output by the driving chip, and at the moment, the LEDs in a part of sub-regions are turned on. For example, only the 4 LEDs at the vertices of the rectangle may be turned on.
Under the condition that the brightness requirement of the display picture is high, for example, when the proportion of the white picture is high, the control switch is in the second switch state by the control signal which can be output by the driving chip, and at the moment, the LEDs in all the sub-regions are all turned on to meet the brightness requirement.
It can be seen that, in this embodiment, the backlight plate may further include a control switch, the control switch is disposed between the driving chip and the cathode of the last LED connected in series in each sub-region, and the control switch is configured to be set to a first switch state or a second switch state according to a control signal output by the driving chip. Therefore, only one driving chip is required to be arranged for each LED area, and one driving chip is not required to be arranged for each sub-area, so that the number of the driving chips can be greatly reduced.
As an implementation manner of the embodiment of the present invention, for a case that the LED area includes 16 LEDs, each sub-area includes 4 LEDs, and the connection manner of the LEDs is as shown in fig. 2, the width L of the power line in the backlight board may satisfy the following condition:
Lmax＝0.5(d-3g)
wherein d is the spacing between adjacent LEDs and g is the spacing between adjacent power lines. For the layout of the LEDs, due to the small pitch between the LEDs and the requirements of the current required by the power lines between the LEDs and the width of the traces, for the connection manner shown in fig. 2, assuming that the pitch between adjacent LEDs is d, the pitch between adjacent power lines is g, and the width of the traces is L, the maximum value Lmax of L may be determined to be 0.5(d-3 g).
As an implementation manner of the embodiment of the present invention, the number of the LEDs included in each of the sub-regions may not be completely the same, for example, the LED region includes 36 LEDs, and is arranged in a 6 × 6 rectangle, where 4 LEDs located at the vertex of the rectangle constitute one sub-region, and the remaining 32 LEDs constitute one sub-region every 8 LEDs, and constitute 4 sub-regions, so that the LED region includes 1 sub-region composed of 4 LEDs and 4 sub-regions composed of 8 LEDs.
For the sub-regions including LEDs with different numbers, power supplies capable of providing different driving voltages are required to supply power respectively, so in this case, the backlight plate may further include a plurality of power supplies and driving chips. Specifically, the anode of the first LED connected in series in the first sub-area is electrically connected with the same power supply, the anode of the first LED connected in series in the second sub-area is electrically connected with different power supplies, the driving chip is electrically connected with the cathode of the last LED connected in series in each sub-area, and each power supply is electrically connected with the driving chip to form a loop. The first sub-area is a sub-area with the same number of included LEDs, and the second sub-area is a sub-area with different number of included LEDs.
As shown in fig. 5, for the LED area described in the above example, the anode of the first LED connected in series in the sub-area 510 composed of 4 LEDs located at the vertex of the rectangle may be electrically connected to the power supply 520, and the anode of the first LED connected in series in the remaining 4 sub-areas composed of 8 LEDs may be electrically connected to the power supply 530, so that the power supply 520 may provide a suitable driving voltage for the LEDs connected in series in the sub-area 510, and the power supply 530 may provide a suitable driving voltage for the LEDs connected in series in the remaining sub-areas, thereby ensuring that the LEDs can operate normally.
It can be seen that, in this embodiment, for the case that the number of LEDs included in each sub-region is not exactly the same, the backlight plate may further include a plurality of power supplies and driving chips, an anode of a first LED connected in series in the first sub-region is electrically connected to the same power supply, and an anode of a first LED connected in series in the second sub-region is electrically connected to different power supplies, so that each LED can be ensured to normally operate under a suitable driving voltage.
Corresponding to the backlight plate, the embodiment of the invention also provides a display panel, and the display panel can comprise the backlight plate described in any embodiment. The display panel can be applied to electronic equipment such as a mobile phone, a tablet computer and a notebook computer, and is not limited specifically.
Therefore, in the scheme provided by the embodiment of the present invention, the backlight plate included in the display panel includes a plurality of LED regions, each of the LED regions is connected in parallel, wherein: each LED area comprises a plurality of sub-areas which are connected in parallel; each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series. Thus, when the proportion of the white picture in the display picture is high and the driving current is I, the plurality of sub-regions are connected in parallel, and the sum of the currents of the plurality of sub-regions is I, so that the current passing through each LED is less than I, and the power consumption of each LED is less than (1-eta) I2And R, it can be seen that under the condition of higher proportion of white pictures, the power consumption of the backlight plate can be effectively reduced, and further the power consumption of the display panel is reduced.
In fig. 3(a) -3 (c) and 5, the dividing manner of the sub-regions is mainly described, and therefore, the connection lines between the LEDs are omitted.
In response to the backlight provided in the embodiment of the present invention, an embodiment of the present invention further provides a method for controlling a backlight, and the method for controlling a backlight provided in the embodiment of the present invention is described below. The method for controlling the backlight plate provided by the embodiment of the present invention may be applied to a controller, a processor, a control chip, and the like in a display device including the backlight plate, and is not specifically limited herein.
As shown in fig. 6, a method for controlling a backlight plate, the backlight plate includes a plurality of LED regions connected in parallel, each LED region includes a plurality of sub-regions connected in parallel; each subarea consists of a plurality of LEDs, and the LEDs included in each subarea are connected in series; the method comprises the following steps:
s601, determining whether the driving current is greater than a preset threshold value, and executing the step S602 under the condition that the driving current is not greater than the preset threshold value; if the driving current is greater than the preset threshold, executing step S603;
s602, turning on LEDs included in part of the sub-regions;
s603, turning on all the LEDs included in the plurality of sub-areas.
Therefore, in the scheme provided by the embodiment of the invention, the backlight plate comprises a plurality of Light Emitting Diode (LED) areas, and the LED areas are connected in parallel, wherein: each LED area comprises a plurality of sub-areas which are connected in parallel; each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series. Turning on LEDs included in part of the sub-regions in the plurality of sub-regions under the condition that the driving current is not greater than a preset threshold; and under the condition that the driving current is larger than a preset threshold value, turning on the LEDs included in all the sub-areas. Therefore, under the condition that the proportion of a white picture in a display picture is high and the driving current I is larger than a preset threshold value, the LEDs included in all the sub-areas are started, the sub-areas are connected in parallel, the sum of the currents of the sub-areas is I, so that the current passing through each LED is smaller than I, and the power consumption of each LED is smaller than (1-eta) I2R, it can be seen that under the condition of high white picture proportion, the power consumption of the backlight plate can be effectively reduced.
Fig. 7 shows a schematic diagram of a relationship curve between the luminous efficiency and the driving current of the LED, and assuming that the driving currents corresponding to the LED are I1 and I2 when the luminous efficiency is η, the driving currents can be controlled to be in the intervals (I1 and I2) when the backlight panel operates. However, in some cases, for example, when the white frame ratio in the display frame is high, the display luminance needs to be high, and the driving current I needs to be large, which may be larger than I2. The operating current for a MINI-LED type backlight will also often be greater than I2.
Therefore, in order to determine the control manner of the suitable backlight plate, the above step S601 of determining whether the driving current is greater than the preset threshold value may be performed. The preset threshold may be the above I2, or may be set according to an actual display requirement, which is not specifically limited herein.
Specifically, the driving current is not greater than the preset threshold (I2), and in the first case, the driving current I is smaller, and the driving current I is less than or equal to I1, where the driving current I is smaller, which indicates that the brightness of the backlight panel needs to be not high, and only the LEDs included in some of the sub-regions may be turned on. In one embodiment, for the LED area shown in fig. 2, only 4 LEDs at the vertices of the rectangle may be turned on.
In the second case, the driving current I satisfies I1 < I ≦ I2, and the driving current I is also small, which means that the brightness of the backlight is not high, and therefore, only the LEDs included in some of the plurality of sub-regions may be turned on. In one embodiment, for the LED area shown in fig. 2, only 4 LEDs at the vertices of the rectangle may be turned on.
Aiming at the condition that the driving current is larger than the preset threshold value, namely I2 is smaller than I, the driving current I is larger at the moment, which indicates that the brightness of the backlight plate needs to be higher, and at the moment, in order to ensure that the luminous brightness simultaneously reduces the power consumption of the backlight plate, the LEDs included in all the sub-regions can be turned on.
In one embodiment, all 16 LEDs may be turned on for the LED area shown in fig. 2 above. Therefore, all the LEDs are turned on, the light-emitting brightness of the backlight plate can be ensured, and meanwhile, because the sub-regions are in parallel connection, the current passing through each LED is I/4, and the power consumption is reduced to (1-eta) I2R/16, even though the number of LEDs turned on is increased compared to the manner in the related art, the overall power consumption is reduced to 1/4 thereof.
Therefore, by adopting the control method of the backlight plate provided by the embodiment of the invention, the LEDs in each sub-region can be controlled to be turned on or off according to the magnitude of the driving current, the number of the turned-on LEDs is converted, the requirement of the luminous brightness is met, and the power consumption and the heating degree of the backlight plate can be reduced.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, as for the display panel and the control method embodiment, since they are substantially similar to the backlight plate embodiment, the description is simple, and the relevant points can be referred to the partial description of the method embodiment.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims (10)

1. A backlight panel comprising a plurality of LED regions, each LED region connected in parallel, wherein:
each LED region comprises a plurality of sub-regions which are connected in parallel;
each sub-area is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-area are connected in series.
2. The backlight panel of claim 1, wherein each sub-region comprises the same number of LEDs;
the backlight plate further comprises a power supply and a driving chip, the power supply is electrically connected with the anode of the first LED connected in series in each sub-region, the driving chip is electrically connected with the cathode of the last LED connected in series in each sub-region, and the power supply is electrically connected with the driving chip.
3. The backlight panel of claim 2, wherein the LED regions comprise N number of LEDs2Wherein N is an even number.
4. The backlight of claim 3, wherein N is an even number from 4 to 10.
5. The backlight panel of claim 3, wherein the number of LEDs included in each sub-region is N.
6. The backlight panel of claim 5, wherein the LED area is a rectangle, N is 4, and 4 LEDs at the vertices of the rectangle form a sub-area.
7. The backlight of any one of claims 2-6, further comprising a control switch;
the control switch is arranged between the driving chip and the cathode of the last LED connected in series in each sub-area, and the control switch is used for setting to be in a first switch state or a second switch state according to a control signal output by the driving chip;
the control switch is in the first switch state, the LEDs in part of the sub-areas are turned on, the control switch is in the second switch state, and the LEDs in all the sub-areas are turned on.
8. The backlight panel of claim 1, wherein each sub-region comprises a non-identical number of LEDs;
the backlight plate also comprises a plurality of power supplies and driving chips, the anode of the first LED connected in series in the first sub-area is electrically connected with the same power supply, the anode of the first LED connected in series in the second sub-area is electrically connected with different power supplies, the driving chips are respectively electrically connected with the cathode of the last LED connected in series in each sub-area, and each power supply is respectively electrically connected with the driving chips;
the first sub-area is a sub-area with the same number of included LEDs, and the second sub-area is a sub-area with a different number of included LEDs.
9. A display panel comprising the backlight panel according to any one of claims 1 to 8.
10. The control method of the backlight board is characterized in that the backlight board comprises a plurality of LED areas, the LED areas are connected in parallel, each LED area comprises a plurality of sub-areas, and the sub-areas are connected in parallel; each subarea consists of a plurality of LEDs, and the LEDs included in each subarea are connected in series; the method comprises the following steps:
turning on LEDs included in a part of the sub-regions in the plurality of sub-regions under the condition that the driving current is not larger than a preset threshold value;
and turning on the LEDs included in all the sub-areas under the condition that the driving current is larger than the preset threshold value.
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