CN112992081B - Backlight plate, display panel and control method of backlight plate - Google Patents
Backlight plate, display panel and control method of backlight plate Download PDFInfo
- Publication number
- CN112992081B CN112992081B CN202110251520.XA CN202110251520A CN112992081B CN 112992081 B CN112992081 B CN 112992081B CN 202110251520 A CN202110251520 A CN 202110251520A CN 112992081 B CN112992081 B CN 112992081B
- Authority
- CN
- China
- Prior art keywords
- leds
- led
- sub
- area
- backlight
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Liquid Crystal (AREA)
- Planar Illumination Modules (AREA)
- Liquid Crystal Display Device Control (AREA)
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, each LED area is connected in parallel, and the method comprises the following steps:each LED region comprises a plurality of sub-regions, the plurality of sub-regions being connected in parallel; each sub-region is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-region are connected in series. Thus, in the case of a high white picture proportion in the display picture and a driving current of I, since the sub-areas are connected in parallel and the sum of the currents of the sub-areas is I, the current passing through each LED is smaller than I, and the power consumption of each LED is smaller than (1-eta) I 2 R, it can be seen that the power consumption of the backlight plate can be effectively reduced under the condition of higher white picture proportion.
Description
Technical Field
The present invention relates to the field of display technologies, and in particular, to a backlight plate, a display panel, and a control method of the backlight plate.
Background
The LCD (Liquid Crystal Display ) can be classified into CCFL (Cold Cathode Fluorescent Lamp, cold cathode fluorescent tube) 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 the LED is used as a backlight source, and the high brightness can be achieved while the lightness and the thinness of the liquid crystal display are considered. The backlight panel 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 included in the LED areas to be simultaneously turned on or turned off according to display requirements.
When the white screen proportion is high in the display screen, the brightness of the backlight source needs to be high, and the driving current I is high, the current passing through the LEDs in each LED area is I, and the power consumption of each LED is P= (1-eta) I 2 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 high in the case of a high white picture ratio.
Disclosure of Invention
An object of an embodiment of the invention is to provide a backlight plate, a display panel and a control method of the backlight plate, so as to reduce power consumption of the backlight plate. The specific technical scheme is as follows:
in a first aspect, an embodiment of the present invention provides a backlight panel, the backlight panel including a plurality of Light Emitting Diode (LED) regions, each LED region being connected in parallel, wherein:
each LED region comprises a plurality of sub-regions, the plurality of sub-regions being connected in parallel;
each sub-region is composed of a plurality of LEDs, and the plurality of LEDs included in each sub-region are connected in series.
Optionally, the number of LEDs included in each sub-area is the same;
the backlight plate further comprises a power supply and a driving chip, wherein the power supply is respectively and electrically connected with the anode of the first LED connected in series in each sub-area, the driving chip is respectively and electrically connected with the cathode of the last LED connected in series in each sub-area, and the power supply is electrically connected with the driving chip.
Optionally, the LED region includes N LEDs 2 Wherein N is an even number.
Optionally, N is an even number from 4 to 10.
Optionally, the number of LEDs included in each sub-area is N.
Optionally, the LED area is a rectangle, the N is 4, and 4 LEDs located at the vertices of the rectangle form a sub-area.
Optionally, the backlight panel 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 is used for setting the control switch into a first switch state or a second switch state according to a control signal output by the driving chip;
the control switches are in the first switch state, some LEDs included in the subareas are turned on, the control switches are in the second switch state, and all LEDs included in the subareas are turned on.
Optionally, the number of LEDs included in each sub-area is not identical;
the backlight plate further comprises a plurality of power supplies and driving chips, wherein the anode of the first LED connected in series in the first subarea is electrically connected with the same power supply, the anode of the first LED connected in series in the second subarea 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 subarea, and each power supply is respectively electrically connected with the driving chips;
the first subareas are subareas with the same number of included LEDs, and the second subareas are subareas with different numbers 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 according to any one of the first aspect.
In a third aspect, an embodiment of the present invention provides a method for controlling a backlight panel, where the backlight panel includes a plurality of light emitting diode LED areas, where the LED areas are connected in parallel, and each LED area includes a plurality of sub-areas, where the plurality of sub-areas are connected in parallel; each sub-area consists of a plurality of LEDs, and the LEDs included in each sub-area are connected in series; the method comprises the following steps:
turning on LEDs included in partial subareas in the plurality of subareas under the condition that the driving current is not greater than a preset threshold value;
and under the condition that the driving current is larger than the preset threshold value, turning on all LEDs included in the subareas.
The embodiment of the invention has the beneficial effects that:
in the scheme provided by the embodiment of the invention, the backlight plate comprises a plurality of Light Emitting Diode (LED) areas, wherein each LED area is connected in parallel, and the backlight plate comprises: each LED area comprises a plurality of subareas which are connected in parallel; each sub-region is composed of a plurality of LEDs, and each sub-region includes a plurality of LEDs connected in series. Thus, in the case of a high white picture proportion in the display picture and a driving current of I, since the sub-areas are connected in parallel and the sum of the currents of the sub-areas is I, the current passing through each LED is smaller than I, and the power consumption of each LED is smaller than (1-eta) I 2 R, it can be seen that the power consumption of the backlight plate can be effectively reduced under the condition of higher white picture proportion. Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are necessary for the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention and that other embodiments may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a backlight board according to an embodiment of the present invention;
FIG. 2 is a schematic view of another structure of a backlight plate according to the embodiment shown in FIG. 1;
FIG. 3 (a) is a schematic diagram of a structure of sub-regions based on the embodiment shown in FIG. 1;
FIG. 3 (b) is another schematic structural view of a sub-region based on the embodiment shown in FIG. 1;
FIG. 3 (c) is another schematic diagram of a sub-region based on the embodiment shown in FIG. 1;
FIG. 4 is a schematic view of another structure of a backlight plate according to the embodiment shown in FIG. 1;
FIG. 5 is a schematic view of another structure of a backlight plate according to the embodiment shown in FIG. 1;
FIG. 6 is a flowchart of a method for controlling a backlight panel according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a relationship between the luminous efficiency and the driving current of the LED.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, those of ordinary skill in the art will be able to devise all other embodiments that are obtained based on this application and are within the scope of the present invention.
In order to reduce power consumption of a backlight, embodiments of the present invention provide a backlight, a display panel, and a method for controlling a backlight, and the backlight provided by the embodiments of the present invention is described below.
As shown in fig. 1, a backlight panel includes a plurality of light emitting diode LED regions 100, each LED region 100 being connected in parallel, wherein:
each LED region 100 comprises a plurality of sub-regions 110, the plurality of sub-regions 110 being connected in parallel;
each sub-region 110 is composed of a plurality of LEDs 111, and the plurality of LEDs 111 included in each sub-region 110 are connected in series.
It can be seen that, in the solution provided by the embodiment of the present invention, the backlight plate includes a plurality of light emitting diode LED regions, each LED region being connected in parallel, wherein: each LED area comprises a plurality of subareas which are connected in parallel; each sub-region is composed of a plurality of LEDs, and each sub-region includes a plurality of LEDs connected in series. Thus, in the case of a high white picture proportion in the display picture and a driving current of I, since the sub-areas are connected in parallel and the sum of the currents of the sub-areas is I, the current passing through each LED is smaller than I, and the power consumption of each LED is smaller than (1-eta) I 2 R, it can be seen that the power consumption of the backlight plate can be effectively reduced under the condition of higher white picture proportion.
For the LED type backlight, especially the MINI-LED type backlight, in the case of a higher white picture ratio in the display picture, the power consumption of each LED is larger due to the larger driving current I, which results in larger power consumption of the entire backlight and serious heat generation. Accordingly, in order to reduce power consumption of the backlight, embodiments of the present invention provide a backlight.
Referring to fig. 1, in the backlight panel provided by the embodiment of the invention, a plurality of light emitting diode LED areas 100 are included, and each LED area 100 is connected in parallel, where the number of LED areas may be determined according to factors such as the size of the display panel, the number of pixels, etc., and may be, for example, 50, 80, 100, etc.
Each LED region 100 includes a plurality of sub-regions 110, and the plurality of sub-regions 110 are connected in parallel, and the region enclosed by a dotted line frame in fig. 1 represents one sub-region. Wherein each sub-region 110 is composed of a plurality of LEDs 111, and each sub-region 110 includes a plurality of LEDs 111 connected in series. Thus, when the driving current I is inputted into each LED region 100, since the respective sub-regions 110 are connected in parallel, it is known from the circuit principle that the sum of the currents passing through the respective sub-regions 110 is I, and then the current passing through each sub-region 110 is smaller than I.
For example, assume that an LED region includes 4 sub-regions, each sub-region including 4 LEDs in series. Then the driving current I is input to the LED region, the current through each sub-region comprising 4 LEDs connected in series is of magnitude I/4, and the power consumption of each LED is p= (1- η) (I/4) 2 R＝(1-η)I 2 R/16, wherein R is the resistance of the LED, and eta is the luminous efficiency of the LED. Since the LED area comprises 16 LEDs, the whole power consumption is (1-eta) I 2 R/16×16＝(1-η)I 2 R。
If the LED area includes 4 LEDs in the backlight panel of the related art, when the driving current I is input to the LED area, the current through each LED is I, and the power consumption of each LED is p= (1- η) I 2 R, the overall power consumption of the LED area is 4 (1-eta) I 2 R is defined as the formula. Therefore, compared with the common backlight board with 4 LEDs connected in series in each LED area in the related art, the backlight board provided by the embodiment of the invention can reduce the overall power consumption of each LED area to 1/4 of the original power consumption, and the overall power consumption of the backlight board is greatly reduced.
Meanwhile, whether all the sub-areas are started or not can be controlled according to actual display requirements, and only one or a part of LEDs included in the sub-areas can be started under the condition that the display requirements require low brightness of a display picture, so that the overall power consumption of the backlight plate is further reduced.
In fig. 1, 2 LED areas and 4 LEDs included in each LED area are taken as an example, and the backlight provided by the embodiment of the present invention must not include only 2 LED areas, each LED area must include 4 LEDs, and neither the number of LEDs included in each LED area nor the number of LEDs included in each LED area in fig. 1 should be taken as a limitation on the number of LEDs included in each LED area in the backlight provided by the embodiment of the present invention.
As an implementation manner of the embodiment of the present invention, the number of LEDs included in each of the sub-areas is the same. Accordingly, as shown in fig. 2, the backlight panel may further include a power supply 200 and a driving chip 300, wherein the power supply 200 is electrically connected to the anode of the first LED in series in each of the sub-regions 110, the driving chip 300 is electrically connected to the cathode of the last LED in series in each of the sub-regions 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 LEDs included in each sub-area may be the same, and the voltages to be applied to each sub-area may be the same, so that each sub-area may be powered by the same power supply, without setting a plurality of power supplies to supply power.
Specifically, the power supply may be electrically connected to the anode of the first LED in series in each sub-region, and the driving chip may be electrically connected to the cathode of the last LED 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 in series in each sub-region is controlled by a common anode, and the cathode of the last LED in series in each sub-region is controlled by a driving chip, which is used to control the on or off of the LEDs included in each sub-region according to the display requirement. Wherein, in general, 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-area may be the same, the power supply is electrically connected to the anode of the first LED connected in series in each sub-area, the driving chip is electrically connected to the cathode of the last LED connected in series in each sub-area, and the power supply is electrically connected to the driving chip, so that it is not necessary to provide a plurality of power supplies, and power can be conveniently supplied to the LEDs included in each sub-area.
As one implementation of the embodiment of the present invention, the LED area includes N LEDs 2 Wherein N is an even number.
Because each LED area corresponds to a certain number of pixel points, the method adapts to the algorithm to the image and the imageProcessing and calculating the relation between the brightness of the backlight plate, ensuring the symmetry between the LEDs and the pixel points in the backlight plate, wherein the number of the LEDs can be N 2 Such a square matrix. Wherein, N is even number, so that the corresponding relation between the LED and the pixel point in the backlight plate can be more conveniently divided, and the brightness control of the backlight plate is facilitated.
Since the number of LEDs included in the LED area affects the ease of wiring and determines the voltage to be supplied by the power supply, N may be an even number from 4 to 10 as an implementation of the embodiment of the present invention, for convenience in wiring and for selecting an appropriate power supply.
The number of the LEDs included in the LED area is not too large, if the number of the LEDs included in the LED area is too large, the LED area is large in size and span, and wiring is difficult, so that the number N can be an even number of 4-10, namely 4, 6, 8 and 10, and wiring can be conveniently carried out and proper power supply selection is facilitated.
As an implementation manner of the embodiment of the present invention, the number of LEDs included in each of the sub-areas may be N. That is, each LED region includes N LEDs 2 Divided into N sub-areas, each sub-area comprising N LEDs.
For example, the number of LEDs included in each LED area is 8 2 May be divided into 8 sub-areas, each of which includes 8 LEDs. The number of LEDs included in each LED area was 6 2 May be divided into 6 sub-areas, each of which includes 6 LEDs.
As an implementation manner of the embodiment of the present invention, the LED area may be rectangular, N may be 4, and 4 LEDs located at the vertices of the rectangle form a sub-area.
The LED areas which are arranged in a rectangular mode can be convenient for arranging all LEDs and determining corresponding relation with pixel points, so that the LED areas in a common backlight plate are rectangular. In one embodiment, the number of LEDs included in each LED area in the backlight plate is N 2 =16, each LED region includes 4 sub-regions, and the number of LEDs included in each sub-region is 4.
In this case, 4 LEDs located at the vertices of the rectangle may be formed into one sub-area, and when the LEDs are actually arranged, since the common LED arrangement manner in the related art is that the 4 LEDs form one LED area, 12 LEDs may be added based on the arrangement manner, each 4 of the 12 LEDs form 1 sub-area, and the original 4 LEDs form one sub-area, that is, the 4 LEDs located at the vertices of the rectangle form one sub-area.
Assuming that the number of original LEDs is X, nX LEDs can be added, and (n+1) x=n is ensured 2 Wherein n is a positive integer. Thus, the backlight board capable of reducing the power consumption can be obtained by more convenient change based on the original LEDs.
The sub-areas to which other LEDs not located at the vertices of the rectangle belong may be partitioned in various ways, as long as the same number of LEDs is ensured to be included in each sub-area. In one embodiment, since the LEDs included in each sub-region need to be connected in series, the sub-regions to which other LEDs belong may 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-area; 4 LEDs positioned at the middle and upper parts 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-area; the 2 LEDs located on the right side of the rectangle and the 2 LEDs located on the right side of the middle lower portion of the rectangle constitute one sub-area.
As another embodiment, as shown in fig. 3 (b), 4 LEDs located at the vertices of a rectangle constitute one sub-area; 4 LEDs positioned at the middle and lower parts 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-area; the 2 LEDs located on the right side of the rectangle and the 2 LEDs located on the right side of the middle and upper part of the rectangle constitute one sub-area.
As another embodiment, as shown in fig. 3 (c), 4 LEDs located at the vertices of a rectangle constitute one sub-area; 4 LEDs positioned in the middle of the rectangle form a sub-area; 2 LEDs on the left side of the rectangle and 2 LEDs on the upper side of the rectangle form a sub-area; the 2 LEDs on the right side of the rectangle and the 2 LEDs on the right side on the lower side of the rectangle constitute a sub-area.
It can be seen that in this embodiment, each LED area may be rectangular, N may be 4, and 4 LEDs located at the vertices of the rectangle constitute a sub-area. Therefore, the LED can be conveniently arranged based on the wiring and the power supply of the original LED, the cost can be reduced, and the operation is convenient.
In order to reduce the number of driving chips, as shown in fig. 4, the backlight unit 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 in series in each sub-area 110, and the control switch 400 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 300.
In one embodiment, the control switch may be a Metal-Oxide-Semiconductor Field-Effect Transistor (Metal-Oxide-semiconductor field-effect transistor) switch. When the control switch is in the first switch state, LEDs included in part of the subareas are turned on, and when the control switch is in the second switch state, LEDs included in all the subareas are turned on.
Under the condition that the brightness requirement of the display picture is low, as the brightness requirement can be met without all LEDs being turned on, the control signals which can be output by the driving chip enable the control switch to be in a first switch state, and at the moment, the LEDs included in part of the subareas are turned on. For example, only the 4 LEDs at the vertices of the rectangle described above may be turned on.
Under the condition that the brightness requirement of the display picture is higher, for example, when the white picture proportion is higher, the driving chip can output a control signal to enable the control switch to be in a second switch state, and at the moment, all LEDs included in all the subareas are turned on to meet the brightness requirement.
It can be seen that in this embodiment, the backlight panel may further include a control switch, where the control switch is disposed between the driving chip and the cathode of the last LED connected in series in each sub-area, 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. Thus, only one driving chip is needed for each LED area, and one driving chip is not needed 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 the case where the LED area includes 16 LEDs, each sub-area includes 4 LEDs, and the connection manner of the respective LEDs is as shown in fig. 2, the width L of the trace of the power line in the backlight board may satisfy the following condition:
Lmax＝0.5(d-3g)
where d is the spacing between adjacent LEDs and g is the spacing between adjacent power lines. For the layout of LEDs, due to the small pitch between LEDs and the requirements of the current and the wiring width required for the power lines between LEDs, assuming that the pitch between adjacent LEDs is d and the pitch between adjacent power lines is g and the wiring width is L for the connection method shown in fig. 2, the maximum value lmax=0.5 (d-3 g) of L can be determined.
As an implementation manner of the embodiment of the present invention, the number of LEDs included in each sub-area may not be exactly the same, for example, the LED area includes 36 LEDs, which are arranged in a 6×6 rectangle, where 4 LEDs located at the vertices of the rectangle form one sub-area, and the remaining 32 LEDs form one sub-area each, and form 4 sub-areas altogether, so that the LED area includes 1 sub-area formed by 4 LEDs and 4 sub-areas formed by 8 LEDs.
For sub-areas comprising different numbers of LEDs, power supplies capable of providing different driving voltages are required to be supplied separately, so in this case the backlight may also comprise a plurality of power supplies and driving chips. Specifically, the anode of the first LED in series in the first sub-area is electrically connected to the same power supply, the anode of the first LED in series in the second sub-area is electrically connected to a different power supply, the driving chip is electrically connected to the cathode of the last LED in series in each sub-area, and each power supply is electrically connected to the driving chip, respectively, to form a loop. The first subareas are subareas with the same number of included LEDs, and the second subareas are subareas with different numbers of included LEDs.
As shown in fig. 5, for the LED region described in the above example, the anode of the first LED connected in series in the sub-region 510 consisting of 4 LEDs located at the top of the rectangle is electrically connected to the power source 520, and the anodes of the first LED connected in series in the remaining 4 sub-regions consisting of 8 LEDs are electrically connected to the power source 530, so that the power source 520 can provide a suitable driving voltage for the LEDs connected in series in the sub-region 510, and the power source 530 can provide a suitable driving voltage for the LEDs connected in series in the remaining sub-regions, thereby ensuring that each LED can operate normally.
It can be seen that, in this embodiment, for the case that the number of LEDs included in each sub-area is not exactly the same, the backlight panel may further include a plurality of power supplies and driving chips, where the anode of the first LED connected in series in the first sub-area is electrically connected to the same power supply, and the anode of the first LED connected in series in the second sub-area is electrically connected to a different power supply, so that each LED can be ensured to operate normally under a suitable driving voltage.
Corresponding to the backlight plate, the embodiment of the invention also provides a display panel, which may comprise the backlight plate according to any one of the embodiments. The display panel can be applied to electronic equipment such as mobile phones, tablet computers, notebook computers and the like, and is not particularly limited.
In the solution provided by the embodiment of the present invention, the backlight panel included in the display panel includes a plurality of Light Emitting Diode (LED) regions, each LED region being connected in parallel, wherein: each LED area comprises a plurality of subareas which are connected in parallel; each sub-region is composed of a plurality of LEDs, and each sub-region includes a plurality of LEDs connected in series. Thus, in the case of a high white picture proportion in the display picture and a driving current of I, since the sub-areas are connected in parallel and the sum of the currents of the sub-areas is I, the current passing through each LED is smaller than I, and the power consumption of each LED is smaller than (1-eta) I 2 R，Therefore, under the condition of higher white picture proportion, the power consumption of the backlight plate can be effectively reduced, and the power consumption of the display panel is further reduced.
Here, the division of the sub-areas is mainly described in fig. 3 (a) -3 (c) and 5, and thus the connection lines between the LEDs are omitted.
Corresponding to the above-mentioned backlight plate provided by the embodiment of the present invention, the embodiment of the present invention further provides a method for controlling a backlight plate, and the method for controlling a backlight plate provided by the embodiment of the present invention is described below. The control method of the backlight plate provided by the embodiment of the invention can be applied to a controller, a processor, a control chip and the like in display equipment comprising the backlight plate, and is not particularly limited herein.
As shown in fig. 6, a control method of a backlight panel, the backlight panel includes a plurality of Light Emitting Diode (LED) regions connected in parallel, each LED region includes a plurality of sub-regions connected in parallel; each sub-area consists of a plurality of LEDs, and the LEDs included in each sub-area 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 step S602 under the condition that the driving current is not greater than the preset threshold value; executing step S603 if the driving current is greater than the preset threshold;
s602, turning on LEDs included in partial subareas in the plurality of subareas;
s603, turning on LEDs included in all the plurality of sub-areas.
It can be seen that, in the solution provided by the embodiment of the present invention, the backlight plate includes a plurality of light emitting diode LED regions, each LED region being connected in parallel, wherein: each LED area comprises a plurality of subareas which are connected in parallel; each sub-region is composed of a plurality of LEDs, and each sub-region includes a plurality of LEDs connected in series. Turning on LEDs included in a part of the sub-areas in the plurality of sub-areas under the condition that the driving current is not greater than a preset threshold value; and turning on LEDs included in all the plurality of sub-areas under the condition that the driving current is larger than a preset threshold value. Thus, the white picture proportion is higher in the display picture, and the driving current I is larger than the preset valueWhen the threshold is set, the LEDs in all the sub-areas are turned on, and the sum of the currents in 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) I 2 R, it can be seen that the power consumption of the backlight plate can be effectively reduced under the condition of higher white picture proportion.
As shown in fig. 7, the graph of the relation between the luminous efficiency and the driving current of the LED is shown, and if the driving current corresponding to the LED is I1 and I2 when the luminous efficiency is η, the driving current can be controlled to be in the (I1, I2) interval when the backlight is operated. However, in some cases, for example, when the proportion of white images in the display is high, the display brightness is required to be high, and the driving current I is required to be large, which may be greater than I2. For a MINI-LED type backlight, its operating current will also often be greater than I2.
Therefore, in order to determine a suitable control manner of the backlight, the above-described step S601 of determining whether the driving current is greater than a 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.
For the case that the driving current is not greater than the preset threshold value (I2), specifically, two cases may be included, in the first case, the driving current I is smaller, the driving current I is less than or equal to I1, at this time, the driving current I is smaller, which indicates that the brightness of the backlight board needs not to be high, and only LEDs included in a part of sub-areas in the plurality of sub-areas may be turned on. In one embodiment, for the LED area shown in fig. 2 described above, only 4 LEDs at the vertices of a rectangle may be turned on.
In the second case, the driving current I satisfies I1 < i+.i2, and the driving current I is smaller at this time, which means that the brightness requirement of the backlight is not high, so that 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 described above, only 4 LEDs at the vertices of a rectangle may be turned on.
For the case that the driving current is greater than the preset threshold, that is, the case that I2 is less than I, the driving current I is greater at this time, which indicates that the brightness of the backlight board needs to be higher, and at this time, in order to ensure the light-emitting brightness and reduce the power consumption of the backlight board at the same time, LEDs included in all sub-areas may be turned on.
In one embodiment, all 16 LEDs may be turned on for the LED area shown in fig. 2 described above. Thus, all LEDs are turned on to ensure the luminous brightness of the backlight plate, and meanwhile, the parallel connection between the subareas ensures that the current passing through each LED is I/4 and the power consumption is reduced to (1-eta) I 2 R/16, even if the number of LEDs turned on is increased compared to that 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 subarea can be controlled to be turned on or off according to the magnitude of the driving current, the number of turned-on LEDs is converted, the light-emitting brightness requirement is met, and the power consumption and the heating degree of the backlight plate can be reduced.
It is noted that relational terms such as first and second, and the like are 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. Moreover, 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 one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for the display panel and control method embodiments, since they are substantially similar to the backlight embodiments, the description is relatively simple, and reference is made to the description of the method embodiments for relevant points.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (8)
1. A backlight comprising a plurality of light emitting diode, LED, regions, each LED region being connected in parallel, wherein:
each LED region comprises a plurality of sub-regions, the plurality of sub-regions being connected in parallel;
each sub-area consists of a plurality of LEDs, and the LEDs included in each sub-area are connected in series;
the LED area is rectangular, 4 LEDs positioned at the top of the rectangle form a sub-area, and under the condition that the driving current is not more than a preset threshold value, the 4 LEDs positioned at the top of the rectangle are turned on; under the condition that the driving current is larger than the preset threshold value, all LEDs included in the subareas are turned on;
the LED area comprises N LEDs 2 Wherein N is an even number.
2. The backlight of claim 1, wherein each sub-area comprises the same number of LEDs;
the backlight plate further comprises a power supply and a driving chip, wherein the power supply is respectively and electrically connected with the anode of the first LED connected in series in each sub-area, the driving chip is respectively and electrically connected with the cathode of the last LED connected in series in each sub-area, and the power supply is electrically connected with the driving chip.
3. The backlight of claim 1, wherein N is an even number of 4-10.
4. The backlight of claim 1, wherein the number of LEDs included in each sub-area is N.
5. The backlight of claim 2, 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 is used for setting the control switch into a first switch state or a second switch state according to a control signal output by the driving chip;
the control switches are in the first switch state, some LEDs included in the subareas are turned on, the control switches are in the second switch state, and all LEDs included in the subareas are turned on.
6. The backlight of claim 1, wherein the number of LEDs included in each sub-area is not exactly the same;
the backlight plate further comprises a plurality of power supplies and driving chips, wherein the anode of the first LED connected in series in the first subarea is electrically connected with the same power supply, the anode of the first LED connected in series in the second subarea 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 subarea, and each power supply is respectively electrically connected with the driving chips;
the first subareas are subareas with the same number of included LEDs, and the second subareas are subareas with different numbers of included LEDs.
7. A display panel, characterized in that the display panel comprises a backlight as claimed in any one of claims 1-6.
8. A control method of a backlight plate, characterized in that the backlight plate comprises a plurality of Light Emitting Diode (LED) areas, the LED areas are connected in parallel, each LED area comprises a plurality of subareas, and the subareas are connected in parallel; each of which isThe subareas are composed of a plurality of LEDs, and the LEDs included in each subarea are connected in series; the LED area comprises N LEDs 2 Wherein N is an even number; the LED area is rectangular, and 4 LEDs positioned at the vertex of the rectangle form a sub-area; the method comprises the following steps:
turning on 4 LEDs positioned at the top of the rectangle under the condition that the driving current is not greater than a preset threshold value;
and under the condition that the driving current is larger than the preset threshold value, turning on all LEDs included in the subareas.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110251520.XA CN112992081B (en) | 2021-03-08 | 2021-03-08 | Backlight plate, display panel and control method of backlight plate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110251520.XA CN112992081B (en) | 2021-03-08 | 2021-03-08 | Backlight plate, display panel and control method of backlight plate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112992081A CN112992081A (en) | 2021-06-18 |
| CN112992081B true CN112992081B (en) | 2023-04-25 |
Family
ID=76335831
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110251520.XA Active CN112992081B (en) | 2021-03-08 | 2021-03-08 | Backlight plate, display panel and control method of backlight plate |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112992081B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN118426223A (en) * | 2023-02-01 | 2024-08-02 | 华为技术有限公司 | Backlight assembly, display panel and computer device |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794891A (en) * | 2004-12-22 | 2006-06-28 | 索尼公司 | Illumination apparatus and image display apparatus |
| CN109164641A (en) * | 2018-10-30 | 2019-01-08 | 厦门天马微电子有限公司 | A kind of backlight module and display device |
| CN109273574A (en) * | 2017-07-12 | 2019-01-25 | 三星电子株式会社 | Semiconductor package and the display device for using semiconductor package |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070108736A (en) * | 2006-05-08 | 2007-11-13 | 삼성전기주식회사 | Led backlight driving system |
| CN202093785U (en) * | 2011-04-27 | 2011-12-28 | 海尔集团公司 | LCD display equipment using LED backlight |
| CN102750911B (en) * | 2012-07-10 | 2015-11-25 | 深圳市华星光电技术有限公司 | A kind of LED backlight drive circuit, backlight module and liquid crystal indicator |
| CN104143318A (en) * | 2013-05-07 | 2014-11-12 | 冠捷投资有限公司 | Multimedia display capable of improving contrast and reducing backlight power consumption |
| CN106782346A (en) * | 2016-12-29 | 2017-05-31 | 深圳市华星光电技术有限公司 | A kind of backlight module circuit and liquid crystal display |
| CN108109591A (en) * | 2017-11-03 | 2018-06-01 | 硅谷数模半导体（北京）有限公司 | The control device and notebook panel of display screen |
| CN110632795B (en) * | 2019-09-25 | 2022-09-02 | 京东方科技集团股份有限公司 | Backlight source, back plate thereof and manufacturing method |
| CN111863863B (en) * | 2020-07-31 | 2024-08-30 | 上海天马微电子有限公司 | Light-emitting panel, display panel and display device |
-
2021
- 2021-03-08 CN CN202110251520.XA patent/CN112992081B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1794891A (en) * | 2004-12-22 | 2006-06-28 | 索尼公司 | Illumination apparatus and image display apparatus |
| CN109273574A (en) * | 2017-07-12 | 2019-01-25 | 三星电子株式会社 | Semiconductor package and the display device for using semiconductor package |
| CN109164641A (en) * | 2018-10-30 | 2019-01-08 | 厦门天马微电子有限公司 | A kind of backlight module and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112992081A (en) | 2021-06-18 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4123183B2 (en) | Constant current drive device, backlight light source device, and color liquid crystal display device | |
| JP4299622B2 (en) | Liquid crystal display device and driving method used for the liquid crystal display device | |
| JP4182930B2 (en) | Display device and backlight device | |
| US8599119B2 (en) | Backlight device and display device | |
| JP5600433B2 (en) | Display device with backlight | |
| US8624940B2 (en) | Backlight unit and display apparatus | |
| JP2009139931A (en) | Backlight device and liquid crystal display device using the same | |
| JP2010272410A (en) | Backlight device, and display apparatus | |
| JP2005310996A (en) | Fixed current driving device, back light optical source equipment, and color liquid crystal display device | |
| CN101950546A (en) | Liquid crystal display device and display control method thereof | |
| CN112992081B (en) | Backlight plate, display panel and control method of backlight plate | |
| US9357611B2 (en) | Light emitting diode driver apparatus | |
| US20210358422A1 (en) | Driving Method and Driving Circuit for Backlight, Backlight and Display Apparatus | |
| KR101205535B1 (en) | Apparatus for driving of light source and display device having the same and method of driving of light source | |
| JP2007225871A (en) | Display device and its display method | |
| US20180102097A1 (en) | Display device | |
| CN211014943U (en) | Display device | |
| US20160037601A1 (en) | Backlight device | |
| US8319722B2 (en) | Backlight unit for liquid crystal display device and driving method driving the same | |
| KR100818829B1 (en) | Illuminating device and liquid crystal display | |
| CN115798421B (en) | Driving method, driving circuit and display device of display panel | |
| JPH10282470A (en) | Liquid crystal display device | |
| CN115273736A (en) | Light-emitting panel, driving method of light-emitting panel and display device | |
| JP2009181839A (en) | Lighting system and display device equipped therewith | |
| JP3101783U (en) | Digitally controlled multiple light source drive |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |