CN114236900A

CN114236900A - Backlight module and display device

Info

Publication number: CN114236900A
Application number: CN202111287147.XA
Authority: CN
Inventors: 常红燕; 马静
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2021-11-02
Filing date: 2021-11-02
Publication date: 2022-03-25

Abstract

The application discloses backlight unit and display device belongs to and shows technical field. The backlight module comprises a first backlight unit, a second backlight unit and a controller. The first backlight unit is used for providing a light source for a first sub-pixel, and the first sub-pixel is a sub-pixel connected with a first scanning line. The second backlight unit is used for providing light sources for other sub-pixels except the first sub-pixel. The controller is used for controlling the light emitting brightness of the first backlight unit and the second backlight unit. When the backlight module works, if the target gray scales of the first sub-pixel and other sub-pixels are the same, the controller controls the light-emitting brightness of the first backlight unit to be larger than that of the second backlight unit. Therefore, when the display device works, the luminous brightness of the sub-pixels connected with the first scanning line in the array substrate can be improved, and the display effect of the display device is improved.

Description

Backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module and a display device.

Background

The display device comprises a backlight module and an array substrate. The array substrate comprises a plurality of scanning lines, a plurality of data lines, a plurality of sub-pixels and a plurality of switch circuits which correspond to the sub-pixels one to one. The backlight module is used for providing light sources for the plurality of sub-pixels on the array substrate. When the array substrate works, the scanning line controls the switch circuit to be conducted. The data lines write electric signals into the corresponding sub-pixels through the switching circuits, and charge the sub-pixels to enable the corresponding sub-pixels to emit light. In general, a display device outputs a scan signal from a first scan line to a plurality of scan lines to control a plurality of sub-pixels to emit light row by row in displaying one frame of image.

In the related art, when the display device displays one frame of image, the polarity of the data voltage output by each data line with respect to the common voltage is kept unchanged. When the display device displays two adjacent frames of images, the polarity of the data voltage output by each data line relative to the common voltage changes.

However, when the polarity of the data voltage output by the data line changes relative to the polarity of the common voltage, the voltage value of the data voltage changes greatly, and meanwhile, since the data line has resistance, the voltage value of the data voltage changes, which may cause the charging amount of the data line for charging the sub-pixels to be less than the charging amount required by the sub-pixels to emit light in the process of outputting the scan signal by the first scan line, and further cause the luminance of the sub-pixels connected to the first scan line in the array substrate to be darker.

Disclosure of Invention

The application provides a backlight module and a display device, which can improve the luminance of sub-pixels connected with a first scanning line in an array substrate. The technical scheme is as follows:

in a first aspect, a backlight module is provided, which is applied to a display device, where the display device includes an array substrate, where the array substrate includes a plurality of sub-pixels and a plurality of scan lines; a first scanning line in the plurality of scanning lines is a scanning line which outputs a first scanning signal when the array substrate works; the plurality of sub-pixels include at least one first sub-pixel, which is a sub-pixel connected to the first scan line;

the backlight module includes: a first backlight unit for providing a light source to the first sub-pixel, a second backlight unit for providing a light source to the other sub-pixels except the first sub-pixel among the plurality of sub-pixels, and a controller for controlling light emitting luminance of the first backlight unit and the second backlight unit; and the controller controls the light-emitting brightness of the first backlight unit to be greater than that of the second backlight unit when the target gray scales of the first sub-pixel and the other sub-pixels are the same.

In the present application, a backlight module includes a first backlight unit, a second backlight unit, and a controller. The first backlight unit is used for providing a light source for a first sub-pixel, the first sub-pixel is a sub-pixel connected with a first scanning line, and the first scanning line is a first scanning line for outputting a scanning signal when the array substrate works. The second backlight unit is used for providing light sources for other sub-pixels except the first sub-pixel. The controller is used for controlling the light emitting brightness of the first backlight unit and the second backlight unit. When the backlight module works, if the target gray scales of the first sub-pixel and other sub-pixels are the same, the controller controls the light-emitting brightness of the first backlight unit to be larger than that of the second backlight unit. Therefore, under the condition that the target gray scales of the first sub-pixel and other sub-pixels are the same, the light-emitting brightness of the first sub-pixel connected with the first scanning line in the array substrate can be improved, so that the light-emitting brightness of the first sub-pixel is closer to the light-emitting brightness of other sub-pixels, and the display effect of the display device is improved.

Optionally, the plurality of sub-pixels include a plurality of first sub-pixels, the backlight module includes a plurality of first backlight units, and the number of the plurality of first sub-pixels is equal to the number of the plurality of first backlight units, and the plurality of first backlight units are configured to provide light sources for the plurality of first sub-pixels one by one.

Optionally, the plurality of sub-pixels includes a plurality of first sub-pixels, the backlight module includes a plurality of first backlight units, and the number of the plurality of first sub-pixels is greater than the number of the plurality of first backlight units, one of the plurality of first backlight units is configured to provide a light source for one of the plurality of first sub-pixels, or one of the plurality of first backlight units is configured to provide a light source for a plurality of adjacent first sub-pixels of the plurality of first sub-pixels.

Optionally, the backlight module further includes: a first drive circuit and a second drive circuit;

the input end of the first driving circuit is connected with the first output end of the power supply, the output end of the first driving circuit is connected with the first backlight unit, and when the first driving circuit outputs current to the first backlight unit, the first backlight unit emits light;

the input end of the second driving circuit is connected with the second output end of the power supply, the output end of the second driving circuit is connected with the second backlight unit, and when the second driving circuit outputs current to the second backlight unit, the second backlight unit emits light;

the controller is further connected to the power supply, and is configured to control an output voltage of a first output terminal of the power supply and an output voltage of a second output terminal of the power supply, so that when the target gray scales of the first sub-pixel and the other sub-pixels are the same, a current output to the first backlight unit by the first driving circuit is greater than a current output to the second backlight unit by the second driving circuit.

Optionally, the first driving circuit includes a first driving transistor, a first pole of the first driving transistor is connected to the first output terminal of the power supply, and a second pole of the first driving transistor is connected to the first backlight unit;

the second driving circuit comprises a second driving transistor, a first pole of the second driving transistor is connected with a second output end of the power supply, a second pole of the second driving transistor is connected with the second backlight unit, and the channel width-length ratio of the first driving transistor is larger than that of the second driving transistor;

and the controller controls the output voltage of the first output end of the power supply to be equal to the output voltage of the second output end of the power supply when the target gray scales of the first sub-pixel and the other sub-pixels are the same.

Optionally, the backlight module further includes: a first resistor and a second resistor;

a first end of the first resistor is connected with an output end of the first driving circuit, and a second end of the first resistor is connected with the first backlight unit;

a first end of the second resistor is connected with an output end of the second driving circuit, a second end of the second resistor is connected with the second backlight unit, and the resistance value of the first resistor is smaller than that of the second resistor;

Optionally, the controller controls an output voltage of the first output terminal of the power supply to be greater than an output voltage of the second output terminal of the power supply when the target gray scales of the first sub-pixel and the other sub-pixels are the same.

Optionally, the controller stores a first corresponding relationship, where the first corresponding relationship is a corresponding relationship between a target gray scale and a first voltage; the controller is configured to: when the first sub-pixel needs to emit light, acquiring a corresponding first voltage from the first corresponding relation according to the target gray scale of the first sub-pixel, and controlling the output voltage of a first output end of the power supply to be equal to the first voltage;

the controller stores a second corresponding relation, the second corresponding relation is a corresponding relation between target gray scales and second voltages, and a first voltage corresponding to any target gray scale in the first corresponding relation is larger than a second voltage corresponding to any target gray scale in the second corresponding relation; the controller is configured to: and when the other sub-pixels need to emit light, acquiring corresponding second voltages from the second corresponding relation according to the target gray scales of the other sub-pixels, and controlling the output voltage of the second output end of the power supply to be equal to the second voltage.

Optionally, the light efficiency of the first backlight unit is greater than the light efficiency of the second backlight unit;

the controller controls the power of the first backlight unit to be equal to the power of the second backlight unit when the target gray scales of the first sub-pixel and the other sub-pixels are the same.

In a second aspect, a display device is provided, which includes the array substrate and the backlight module according to any one of the first aspect;

the array substrate comprises a plurality of sub-pixels and a plurality of scanning lines; a first scanning line in the plurality of scanning lines is a scanning line which outputs a first scanning signal when the array substrate works; the plurality of sub-pixels includes at least one first sub-pixel, which is a sub-pixel connected to the first scan line.

It is understood that the beneficial effects of the second aspect can be referred to the related description of the first aspect, and are not described herein again.

Drawings

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

Fig. 1 is a schematic circuit structure diagram of a first array substrate according to an embodiment of the present disclosure;

fig. 2 is a schematic circuit structure diagram of a second array substrate according to an embodiment of the present disclosure;

fig. 3 is a schematic structural diagram of a first viewing angle of a first backlight module according to an embodiment of the present disclosure;

fig. 4 is a schematic structural diagram of a second viewing angle of a first backlight module according to an embodiment of the present disclosure;

fig. 5 is a schematic structural diagram of a first viewing angle of a second backlight module according to an embodiment of the present disclosure;

fig. 6 is a schematic structural diagram of a second viewing angle of a second backlight module according to an embodiment of the present disclosure;

fig. 7 is a schematic view illustrating a first viewing angle of a third backlight module according to an embodiment of the present disclosure;

fig. 8 is a schematic structural diagram of a second viewing angle of a third backlight module according to an embodiment of the present disclosure;

fig. 9 is a schematic circuit structure diagram of a first array substrate according to a second embodiment of the present disclosure;

fig. 10 is a schematic circuit structure diagram of a second array substrate according to a second embodiment of the present application;

fig. 11 is a schematic circuit structure diagram of a backlight module according to a third embodiment of the present application;

fig. 12 is a circuit configuration diagram of a first driving circuit according to a fourth embodiment of the present application;

fig. 13 is a circuit configuration diagram of a second driving circuit according to a fourth embodiment of the present application;

fig. 14 is a circuit diagram of a connection relationship of a first driving circuit according to a fifth embodiment of the present application;

fig. 15 is a circuit diagram of a connection relationship of a second driving circuit according to a fifth embodiment of the present application;

fig. 16 is a schematic structural diagram of a display device according to an eighth embodiment of the present application.

Wherein, the meanings represented by the reference numerals of the figures are respectively as follows:

10. an array substrate;

110. a sub-pixel;

112. a first sub-pixel;

114. other sub-pixels;

120. a switching circuit;

130. a data line;

140. scanning a line;

20. a backlight module;

212. a first backlight unit;

214. a second backlight unit;

220. a controller;

230. a power source;

242. a first drive circuit;

244. a second drive circuit;

30. a display device.

Detailed Description

To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.

It should be understood that reference to "a plurality" in this application means two or more. In the description of the present application, "/" means "or" unless otherwise stated, for example, a/B may mean a or B; "and/or" herein is only an association relationship describing an associated object, and means that there may be three relationships, for example, a and/or B, which may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, for the convenience of clearly describing the technical solutions of the present application, the terms "first", "second", and the like are used to distinguish the same items or similar items having substantially the same functions and actions. Those skilled in the art will appreciate that the terms "first," "second," etc. do not denote any order or quantity, nor do the terms "first," "second," etc. denote any order or importance.

The operation principle of the backlight module 20 according to the embodiment of the present application is explained with reference to the circuit structure of the array substrate 10:

the first embodiment is as follows:

fig. 1 and fig. 2 are schematic circuit diagrams of an array substrate 10 according to an embodiment of the present disclosure. As shown in fig. 1 and 2, the array substrate 10 includes a plurality of sub-pixels 110, a plurality of scan lines 140, a plurality of data lines 130, and a plurality of switching circuits 120. The number of the switching circuits 120 is equal to the number of the sub-pixels 110. The plurality of switching circuits 120 and the plurality of sub-pixels 110 are connected in a one-to-one correspondence. Each of the switching circuits 120 has an input terminal, an output terminal, and a control terminal. The control terminal of the switch circuit 120 is used for controlling the on/off between the input terminal and the output terminal of the switch circuit 120. An input terminal of each of the plurality of switching circuits 120 is connected to one data line 130, a control terminal of each of the switching circuits 120 is connected to one scan line 140, and an output terminal of each of the switching circuits 120 is connected to a corresponding sub-pixel 110. In this way, when the scan line 140 outputs a scan signal, all the switch circuits 120 connected to the scan line 140 are turned on. When the switch circuit 120 is turned on, the data voltage in the data line 130 can be outputted to the sub-pixel 110 connected to the switch circuit 120 through the switch circuit 120. In general, each sub-pixel 110 may include a pixel electrode and may further include a color resistor on the pixel electrode. The pixel electrode is used for forming a voltage difference with the common electrode. The liquid crystal is arranged between the pixel electrode and the common electrode, when a voltage difference exists between the pixel electrode and the common electrode, an electric field is formed between the pixel electrode and the common electrode, and the liquid crystal rotates under the action of the electric field, so that light rays emitted by the backlight source can pass through the sub-pixels 110, and the purpose of luminous display is achieved. Generally, the voltage of the common electrode is fixed, and the data voltage in the data line 130 is used for output to the pixel electrode. The scan lines 140 to which the plurality of switching circuits 120 connected to the same data line 130 are connected are different, so that each sub-pixel 110 can be individually inputted with a data voltage.

Two circuit configurations of the array substrate 10 will be explained below with reference to the drawings and the embodiments.

In a first possible implementation manner, as shown in fig. 1, the array substrate 10 includes 36 sub-pixels 110, 36 switching

circuits

120, 9 data lines 130, and 4 scan lines 140. The 36 sub-pixels 110 are arranged in 4 rows and 9 columns, and the 36 sub-pixels 110 include 12R (Red ), 12G (Green ), and 12B (Blue) sub-pixels 110. The switching circuits 120 correspond to the sub-pixels 110 one to one, and an output terminal of each switching circuit 120 is connected to one sub-pixel 110. For convenience of description, the 9 data lines 130 are referred to as S1, S2 … … S9, respectively. The 4 scan lines 140 are referred to as G1, G2, G3, and G4, respectively. Each data line 130 extends in a column direction and each scan line 140 extends in a row direction. The control terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the first row are all connected to G1, and the control terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the second row are all connected to G2, … …, and the control terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the fourth row are all connected to G4. The input terminals of the switch circuits 120 corresponding to the first column of sub-pixels 110 are all connected to S1, and the input terminals of the switch circuits 120 corresponding to the second column of sub-pixels 110 are all connected to S2, … … and the input terminals of the switch circuits 120 corresponding to the ninth column of sub-pixels 110 are all connected to S9.

When the array substrate 10 operates, G1, G2, G3, and G4 sequentially output scan signals. When G1 outputs the scan signal, S1 to S9 simultaneously output the data voltage, thereby charging the first row of subpixels 110; g2 outputs the scan signal, S1 to S9 simultaneously output the data voltages, so that the polarity of the data voltage output from each data line 130 remains the same with respect to the common voltage during the process of displaying one frame of image by charging … … the second row of sub-pixels 110. Taking the example that the common voltage is 0V and the array substrate 10 is used for displaying a pure color image (i.e., the gray scale of each sub-pixel 110 is the same), when displaying the first frame image, the data voltage output by S1 may be constantly equal to 7V, the data voltage output by S2 may be constantly equal to-7V, and the data voltage output by S3 may be constantly equal to 7V, the data voltage output by S … … S9 may be constantly equal to 7V. When the second frame image is displayed, the data voltage output at S1 may be constantly equal to-7V, the data voltage output at S2 may be constantly equal to 7V, and the data voltage output at S3 may be constantly equal to-7V, … … S9 may be constantly equal to-7V.

In a second possible implementation manner, as shown in fig. 2, the array substrate 10 includes 36 sub-pixels 110, 36 switching

circuits

120, 10 data lines 130, and 4 scan lines 140. The 36 sub-pixels 110 are arranged in 4 rows and 9 columns, and the 36 sub-pixels 110 include 12R sub-pixels 110, 12G sub-pixels 110, and 12B sub-pixels 110. The switching circuits 120 correspond to the sub-pixels 110 one to one, and an output terminal of each switching circuit 120 is connected to one sub-pixel 110. For convenience of description, the 10 data lines 130 are referred to as S1, S2 … … S10, respectively. The 4 scan lines 140 are referred to as G1, G2, G3, and G4, respectively. Each data line 130 extends in a column direction and each scan line 140 extends in a row direction. The control terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the first row are all connected to G1, and the control terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the second row are all connected to G2, … …, and the control terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the fourth row are all connected to G4. The input terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the first row are respectively connected to S1 to S9, the input terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the second row are respectively connected to S2 to S10, the input terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the third row are respectively connected to S1 to S9, and the input terminals of the switch circuits 120 corresponding to the sub-pixels 110 in the fourth row are respectively connected to S2 to S10.

When the array substrate 10 operates, G1, G2, G3, and G4 sequentially output scan signals. When G1 outputs the scan signal, S1 to S9 simultaneously output the data voltage, thereby charging the first row of subpixels 110; g2 outputs the scan signal, S2 to S10 simultaneously output the data voltages, so that the polarity of the data voltage output from each data line 130 remains the same with respect to the common voltage during the process of displaying one frame of image by charging … … the second row of sub-pixels 110. Taking the example where the common voltage is 0V and the array substrate 10 is used to display a pure color image (i.e., the gray scale of each sub-pixel 110 is the same), when displaying the first frame image, the data voltage output at S1 may be constantly equal to 7V, the data voltage output at S2 may be constantly equal to-7V, and the data voltage output at S3 may be constantly equal to 7V, … … S10 may be constantly equal to-7V. When the second frame image is displayed, the data voltage output at S1 may be constantly equal to-7V, the data voltage output at S2 may be constantly equal to 7V, and the data voltage output at S3 may be constantly equal to-7V … … S10 may be constantly equal to 7V.

As can be seen from the above description, when the array substrate 10 shown in fig. 1 and 2 operates, G1, G2, G3 and G4 sequentially output scan signals, that is, when the array substrate 10 shown in fig. 1 and 2 operates, G1 is the first scan line 140 that outputs a scan signal. In the embodiment of the present application, the first scan line 140 outputting the scan signal when the array substrate 10 is in operation is referred to as a first scan line, and the sub-pixel 110 connected to the first scan line is referred to as a first sub-pixel 112. The first subpixel 112 is connected to a first scan line through a switching circuit 120.

Fig. 3 is a schematic structural diagram of a first viewing angle of a first backlight module 20 according to an embodiment of the present disclosure; fig. 4 is a schematic structural diagram of a second viewing angle of the first backlight module 20 according to an embodiment of the present disclosure (the scanning lines other than G1 are not shown in the figure). Wherein the direction of the second viewing angle is opposite to the direction of the first viewing angle. As shown in fig. 3 and 4, the backlight assembly 20 includes a first backlight unit 212, a second backlight unit 214, and a controller (not shown). Here, the first backlight unit 212 refers to a backlight unit for providing a light source to the first sub-pixel 112, and the second backlight unit 214 refers to a backlight unit for providing a light source to the other sub-pixels 114 except the first sub-pixel 112. The controller is used to control the light emitting brightness of the first backlight unit 212 and the second backlight unit 214. When the target grayscales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the light emitting luminance of the first backlight unit 212 is greater than that of the second backlight unit 214.

Specifically, when the display device displays an image, an electric field is formed between the pixel electrode and the common electrode in the sub-pixel 110 of the array substrate 10, and the liquid crystal rotates under the action of the electric field, so that light emitted from the backlight source can pass through the sub-pixel 110. In the process of outputting the scan signal by the first scan line, the charging amount of the data line 130 for charging the first sub-pixel 112 is less than the charging amount required by the sub-pixel 110 to emit light, that is, the voltage of the pixel electrode is less than the voltage required by the emission of light, which results in a small rotation angle of the liquid crystal, and thus the emission brightness of the first sub-pixel 112 is relatively dark. Therefore, under the condition that the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the light emitting luminance of the first sub-pixel 112 can be improved by improving the light emitting luminance of the first backlight unit 212 providing the light source for the first sub-pixel 112 when the display device displays the image.

In some embodiments, the backlight assembly 20 may include one or more first backlight units 212 and one or more second backlight units 214. The schematic diagram of the backlight module 20 including a first backlight unit 212 and a plurality of second backlight units 214 can be as shown in fig. 5 and 6 (the other scanning lines except G1 are not shown in the figure). The brightness of the first backlight unit 212 and the second backlight unit 214 may be constant when the backlight module 20 is in operation. In this case, the light emitting luminance of each first backlight unit 212 is the same, the light emitting luminance of each second backlight unit 214 is the same, and the light emitting luminance of each first backlight unit 212 is constantly greater than the light emitting luminance of the second backlight unit 214. Therefore, the light emitting brightness of the sub-pixels 110 connected to the first scan line in the array substrate 10 can be improved.

In other embodiments, as shown in fig. 3 or fig. 4, the backlight module 20 may include a plurality of first backlight units 212 and a plurality of second backlight units 214, and the light emitting brightness of each backlight unit may be independently adjustable. For example, when the backlight module 20 is in operation, the controller may obtain image data of an image to be displayed. The image to be displayed refers to an image that needs to be displayed by the display device, and the image data of the image to be displayed includes a target gray scale of each sub-pixel 110 in the plurality of sub-pixels 110. The controller can control the light-emitting brightness of each backlight unit according to the image data of the image to be displayed, and when the target gray scale of the sub-pixel 110 of the light source provided by a certain backlight unit is higher, the controller can control the light-emitting brightness of the backlight unit to be higher; conversely, the controller may control the luminance of the backlight unit to decrease as the target gray scale of the sub-pixel 110 of the light source provided by the backlight unit decreases. Thus, the contrast of the display device can be improved. In this specific embodiment, the controller controls the light-emitting luminance of each backlight unit, so that the light-emitting luminance of the first backlight unit 212 providing the first sub-pixel 112 with a light source is greater than the light-emitting luminance of the second backlight unit 214 providing the other sub-pixels 114 with a light source when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, thereby increasing the light-emitting luminance of the sub-pixels 110 connected to the first scan line in the array substrate 10.

In the embodiment of the present application, the backlight module 20 includes a first backlight unit 212, a second backlight unit 214, and a controller. The first backlight unit 212 is used for providing a light source for the first sub-pixel 112, the first sub-pixel 112 is a sub-pixel 110 connected to a first scan line, and the first scan line is a scan line 140 for outputting a first scan signal when the array substrate 10 is in operation. The second backlight unit 214 is used to provide light sources for the other sub-pixels 114 except the first sub-pixel 112. The controller is used to control the light emitting brightness of the first backlight unit 212 and the second backlight unit 214. When the backlight module 20 is in operation, if the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller controls the luminance of the first backlight unit 212 to be greater than the luminance of the second backlight unit 214. Thus, when the display device works, under the condition that the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the light-emitting luminance of the first sub-pixel 112 connected to the first scan line in the array substrate 10 can be improved, so that the light-emitting luminance of the first sub-pixel 112 is closer to the light-emitting luminance of the other sub-pixels 114, and the display effect of the display device is improved.

In some embodiments, as shown in fig. 3 and 4, the plurality of sub-pixels 110 includes a plurality of first sub-pixels 112, and the backlight module 20 includes a plurality of first backlight units 212. The number of the first sub-pixels 112 is equal to the number of the first backlight units 212, and the first backlight units 212 are used for providing light sources for the first sub-pixels 112 one by one. In this case, each of the first backlight units 212 provides a light source for one of the first sub-pixels 112, so that the luminance of the backlight unit can be adjusted for each of the first sub-pixels 112, thereby facilitating to improve the luminance of each of the first sub-pixels 112. In the embodiment of the present application, Micro leds (Micro Light-Emitting diodes) or/and OLEDs (Organic Light-Emitting diodes) may be used as the first backlight unit 212, so as to implement a first backlight unit 212 for providing a Light source for a first sub-pixel 112.

In other embodiments, as shown in fig. 7 and 8 (other scanning lines than G1 are not shown), the plurality of sub-pixels 110 includes a plurality of first sub-pixels 112, and the backlight module 20 includes a plurality of first backlight units 212. The number of the first sub-pixels 112 is greater than the number of the first backlight units 212. One first backlight unit 212 of the plurality of first backlight units 212 is used to provide a light source for one first sub-pixel 112 of the plurality of first sub-pixels 112, or one first backlight unit 212 of the plurality of first backlight units 212 is used to provide a light source for adjacent ones of the plurality of first sub-pixels 112. That is, for the plurality of first sub-pixels 112, one first backlight unit 212 may provide light sources for one first sub-pixel 112, or one first backlight unit 212 may provide light sources for a plurality of first sub-pixels 112, where the plurality of first sub-pixels 112 are generally two or three adjacent first sub-pixels 112. In the embodiment of the present application, micro leds or/and OLEDs may be used as the first backlight unit 212, so that one first backlight unit 212 is implemented to provide a light source for one first sub-pixel 112; a MiniLED (Mini Light-Emitting Diode) may also be used as the first backlight unit 212, so that one first backlight unit 212 is implemented to provide a Light source for the adjacent first sub-pixels 112.

The operation principle of the backlight module 20 according to the embodiment of the present application is explained with reference to another circuit structure of the array substrate 10:

example two:

fig. 9 and 10 are schematic circuit structures of the array substrate 10 according to the second embodiment of the present application. Two other circuit structures of the array substrate 10 will be explained with reference to the drawings and the embodiments.

In a third possible implementation manner, as shown in fig. 9, the array substrate 10 includes 24 sub-pixels 110, 24 switching circuits 120, 4 data lines 130, and 6 scan lines 140. The 24 sub-pixels 110 are arranged in 3 rows and 8 columns, and the 24 sub-pixels 110 include 9R sub-pixels 110, 9G sub-pixels 110, and 6B sub-pixels 110. The switching circuits 120 correspond to the sub-pixels 110 one to one, and an output terminal of each switching circuit 120 is connected to one sub-pixel 110. For convenience of description, the 4 data lines 130 are referred to as S1, S2, S3, and S4, respectively. The 6 scan lines 140 are referred to as G1, G2, G3 … … G6, respectively. Each data line 130 extends in a column direction and each scan line 140 extends in a row direction. Wherein the control terminals of the switch circuits 120 corresponding to the first row of sub-pixels 110 are connected to G1 and G2, and the input terminals of the two switch circuits 120 respectively connected to G1 and G2 can be connected to the same data line 130. The control terminals of the switch circuits 120 corresponding to the second row of sub-pixels 110 are connected to G3 and G4, and the input terminals of two switch circuits 120 respectively connected to G3 and G4 may be connected to the same data line 130. The control terminals of the switch circuits 120 corresponding to the third row of sub-pixels 110 are connected to G5 and G6, and the input terminals of the two switch circuits 120 respectively connected to G5 and G6 may be connected to the same data line 130.

When the array substrate 10 operates, G1, G2, and G3 … … G6 sequentially output scan signals. When G1 outputs the scan signal, S1 to S4 simultaneously output the data voltage, thereby charging the first, fourth, fifth, and seventh subpixels 110 in the first row. When G2 outputs the scan signal, S1 to S4 simultaneously output the data voltage, thereby charging the second, third, sixth, and eighth subpixels 110 in the first row. When G3 outputs the scan signal, S1 to S4 simultaneously output the data voltage, thereby charging the first, third, fifth, and seventh subpixels 110 in the second row. G4 outputs the scan signal, S1 to S4 simultaneously output the data voltages such that the polarity of the data voltage output from each data line 130 with respect to the common voltage remains unchanged during the display of one frame image by charging … … the second, fourth, sixth and eighth sub-pixels 110 in the second row. Taking the common voltage of 0V and the array substrate 10 for displaying a pure color image (i.e., the gray scale of each sub-pixel 110 is the same), when displaying the first frame image, the data voltage output at S1 may be equal to 7V, the data voltage output at S2 may be equal to-7V, the data voltage output at S3 may be equal to 7V, and the data voltage output at S4 may be equal to-7V. When the second frame image is displayed, the data voltage output at S1 may be constantly equal to-7V, the data voltage output at S2 may be constantly equal to 7V, the data voltage output at S3 may be constantly equal to-7V, and the data voltage output at S4 may be constantly equal to 7V.

In a fourth possible implementation manner, as shown in fig. 10, the array substrate 10 includes 24 sub-pixels 110, 24 switching circuits 120, 5 data lines 130, and 6 scan lines 140. The 24 sub-pixels 110 are arranged in 3 rows and 8 columns, and the 24 sub-pixels 110 include 9R sub-pixels 110, 9G sub-pixels 110, and 6B sub-pixels 110. The switching circuits 120 correspond to the sub-pixels 110 one to one, and an output terminal of each switching circuit 120 is connected to one sub-pixel 110. For convenience of description, the 5 data lines 130 are referred to as S1, S2, S3 … … S5, respectively. The 6 scan lines 140 are referred to as G1, G2, G3 … … G6, respectively. Each data line 130 extends in a column direction and each scan line 140 extends in a row direction. Wherein the control terminals of the switch circuits 120 corresponding to the first row of sub-pixels 110 are connected to G1 and G2, and the input terminals of the two switch circuits 120 respectively connected to G1 and G2 can be connected to the same data line 130. The control terminals of the switch circuits 120 corresponding to the second row of sub-pixels 110 are connected to G3 and G4, and the input terminals of two switch circuits 120 respectively connected to G3 and G4 may be connected to the same data line 130. The control terminals of the switch circuits 120 corresponding to the third row of sub-pixels 110 are connected to G5 and G6, and the input terminals of the two switch circuits 120 respectively connected to G5 and G6 may be connected to the same data line 130.

When the array substrate 10 operates, G1, G2, and G3 … … G6 sequentially output scan signals. When G1 outputs the scan signal, S1 to S4 simultaneously output the data voltage, thereby charging the first, fourth, fifth, and seventh subpixels 110 in the first row. When G2 outputs the scan signal, S1 to S4 simultaneously output the data voltage, thereby charging the second, third, sixth, and eighth subpixels 110 in the first row. When G3 outputs the scan signal, S2 to S5 simultaneously output the data voltage, thereby charging the second, fourth, sixth, and eighth subpixels 110 in the second row. G4 outputs the scan signal, S2 to S5 simultaneously output the data voltages such that the polarity of the data voltage output from each data line 130 with respect to the common voltage remains unchanged during the display of one frame image by charging … … the first, third, fifth and seventh sub-pixels 110 in the second row. Taking the common voltage of 0V and the array substrate 10 for displaying a pure color image (i.e., the gray scale of each sub-pixel 110 is the same), when displaying the first frame image, the data voltage output at S1 may be equal to 7V, the data voltage output at S2 may be equal to-7V, the data voltage output at S3 may be equal to 7V, and the data voltage output at S4 may be equal to-7V. When the second frame image is displayed, the data voltage output at S1 may be constantly equal to-7V, the data voltage output at S2 may be constantly equal to 7V, the data voltage output at S3 may be constantly equal to-7V, and the data voltage output at S4 may be constantly equal to 7V.

As is known from the above description, when the array substrate 10 shown in fig. 9 and 10 operates, G1, G2, and G3 … … G6 sequentially output scan signals, that is, when the array substrate 10 shown in fig. 9 and 10 operates, G1 is the first scan line 140 that outputs a scan signal. In the embodiment of the present application, the first scan line 140 outputting the scan signal when the array substrate 10 is in operation is referred to as a first scan line, and the sub-pixel 110 connected to the first scan line is referred to as a first sub-pixel 112. The first subpixel 112 is connected to a first scan line through a switching circuit 120.

As in the first embodiment, the backlight assembly 20 may include a first backlight unit 212, a second backlight unit 214 and a controller. Here, the first backlight unit 212 refers to a backlight unit for providing a light source to the first sub-pixel 112, and the second backlight unit 214 refers to a backlight unit for providing a light source to the other sub-pixels 114 except the first sub-pixel 112. The controller is used to control the light emitting brightness of the first backlight unit 212 and the second backlight unit 214. When the target grayscales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the light emitting luminance of the first backlight unit 212 is greater than that of the second backlight unit 214. Therefore, the luminance of the first sub-pixel 112 when the display device displays an image can be improved, and the problem that the first sub-pixel 112 is dark due to insufficient charging is solved.

In some embodiments, the backlight assembly 20 may include a plurality of first backlight units 212, and one or more second backlight units 214. The brightness of the first backlight unit 212 and the second backlight unit 214 may be constant when the backlight module 20 is in operation. In this case, the light emitting luminance of each first backlight unit 212 is the same, the light emitting luminance of each second backlight unit 214 is the same, and the light emitting luminance of each first backlight unit 212 is constantly greater than the light emitting luminance of the second backlight unit 214. Therefore, the light emitting brightness of the sub-pixels 110 connected to the first scan line in the array substrate 10 can be improved.

In other embodiments, the backlight module 20 may include a plurality of first backlight units 212 and a plurality of second backlight units 214, and the light emitting brightness of each backlight unit may be independently adjustable. For example, when the backlight module 20 is in operation, the controller may obtain image data of an image to be displayed. The image to be displayed refers to an image that needs to be displayed by the display device, and the image data of the image to be displayed includes a target gray scale of each sub-pixel 110 in the plurality of sub-pixels 110. The controller can control the light-emitting brightness of each backlight unit according to the image data of the image to be displayed, and when the target gray scale of the sub-pixel 110 of the light source provided by a certain backlight unit is higher, the controller can control the light-emitting brightness of the backlight unit to be higher; conversely, the controller may control the luminance of the backlight unit to decrease as the target gray scale of the sub-pixel 110 of the light source provided by the backlight unit decreases. Thus, the contrast of the display device can be improved. In this specific embodiment, the controller controls the light-emitting luminance of each backlight unit, so that the light-emitting luminance of the first backlight unit 212 providing the first sub-pixel 112 with a light source is greater than the light-emitting luminance of the second backlight unit 214 providing the other sub-pixels 114 with a light source when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, thereby increasing the light-emitting luminance of the sub-pixels 110 connected to the first scan line in the array substrate 10.

In some embodiments, the plurality of sub-pixels 110 includes a plurality of first sub-pixels 112, and the backlight module 20 includes a plurality of first backlight units 212. The number of the first sub-pixels 112 is equal to the number of the first backlight units 212, and the first backlight units 212 are used for providing light sources for the first sub-pixels 112 one by one. In this case, each of the first backlight units 212 provides a light source for one of the first sub-pixels 112, so that the luminance of the backlight unit can be adjusted for each of the first sub-pixels 112, thereby facilitating to improve the luminance of each of the first sub-pixels 112. In the embodiment of the present application, a micro led or/and an OLED may be used as the first backlight unit 212.

In other embodiments, the plurality of sub-pixels 110 includes a plurality of first sub-pixels 112, and the backlight module 20 includes a plurality of first backlight units 212. The number of the first sub-pixels 112 is greater than the number of the first backlight units 212. One first backlight unit 212 of the plurality of first backlight units 212 is used to provide a light source for one first sub-pixel 112 of the plurality of first sub-pixels 112, or one first backlight unit 212 of the plurality of first backlight units 212 is used to provide a light source for adjacent ones of the plurality of first sub-pixels 112. That is, for the plurality of first sub-pixels 112, one first backlight unit 212 may provide light sources for one first sub-pixel 112, or one first backlight unit 212 may provide light sources for a plurality of first sub-pixels 112, where the plurality of first sub-pixels 112 are generally two or three adjacent first sub-pixels 112. For example, for the embodiment shown in fig. 9 and 10, the first subpixel 112 includes the first, fourth, fifth, and seventh subpixels 110 located in the first row. Among them, the fourth sub-pixel 110 and the fifth sub-pixel 110 are two adjacent sub-pixels 110, and therefore, the fourth sub-pixel 110 and the fifth sub-pixel 110 can share one first backlight unit 212; and the first and seventh sub-pixels 110 may correspond to one first backlight unit 212, respectively. In the embodiment of the present application, a micro led or/and an OLED may be used as the first backlight unit 212, and a MiniLED may also be used as the first backlight unit 212.

An implementation manner of "the luminance of the first backlight unit 212 providing the first sub-pixel 112 with light source is greater than the luminance of the second backlight unit 214 providing the other sub-pixels 114 with light source when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same" is described below:

example three:

fig. 11 is a schematic circuit structure diagram of the backlight module 20 according to the third embodiment of the present application. As shown in fig. 11, the backlight module 20 further includes a first driving circuit 242 and a second driving circuit 244.

Specifically, the first driving circuit 242 has an input terminal c and an output terminal d. The input terminal c of the first driving circuit 242 is connected to the first output terminal a of the power supply 230, and the output terminal d of the first driving circuit 242 is connected to the first backlight unit 212. Thus, when the output terminal d of the first driving circuit 242 outputs current to the first backlight unit 212, the first backlight unit 212 emits light. The second driving circuit 244 has an input terminal e and an output terminal f. The input e of the second driving circuit 244 is connected to the second output b of the power supply 230, and the output f of the second driving circuit 244 is connected to the second backlight unit 214. In this manner, when the output terminal f of the second driving circuit 244 outputs the current value of the second backlight unit 214, the second backlight unit 214 emits light. The controller 220 is connected to the power supply 230 and configured to control the output voltage of the first output terminal and the output voltage of the second output terminal of the power supply 230, so as to control the current output from the first driving circuit 242 to the first backlight unit 212 and the current output from the second driving circuit 244 to the second backlight unit 214, and further control the light emitting brightness of the first backlight unit 212 and the light emitting brightness of the second backlight unit 214. Thus, when the target grayscales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller 220 can control the current output from the first driving circuit 242 to the first backlight unit 212 to be greater than the current output from the second driving circuit 244 to the second backlight unit 214, so as to achieve the purpose of controlling the brightness of the first backlight unit 212 to be greater than the brightness of the second backlight unit 214.

The following explains the first specific implementation manner of the third embodiment in detail, in which the controller 220 controls the first driving circuit 242 to output a current to the first backlight unit 212 that is greater than the current output by the second driving circuit 244 to the second backlight unit 214 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same:

example four:

fig. 12 is a schematic structural diagram of the first driving circuit 242 according to the fourth embodiment of the present application. As shown in fig. 12, the first driving circuit 242 may include: a first switching transistor TFT1, a first driving transistor TFT2 and a storage capacitor C1. A first electrode of the first driving transistor TFT2 is an input terminal c of the first driving circuit 242, that is, a first electrode of the first driving transistor TFT2 is connected to the first output terminal a of the power supply 230. The second pole of the first driving transistor TFT2 is the output terminal d of the first driving circuit 242, that is, the second pole of the first driving transistor TFT2 is connected to the first backlight unit 212. A first pole of the first switching transistor TFT1 is used for inputting a DATA1 signal, a second pole of the first switching transistor TFT1 is connected to a control pole of the first driving transistor TFT2, and the control pole of the first switching transistor TFT1 is used for inputting a SCAN1 signal. Both the SCAN1 signal and the DATA1 signal may be output by the controller 220. The storage capacitor C1 is connected between the control electrode and the second electrode of the first drive transistor TFT 2.

When the first driving circuit 242 is operated, the controller 220 outputs the SCAN1 signal to control the first switching transistor TFT1 to be turned on. When the first switching transistor TFT1 is turned on, the controller 220 outputs a DATA1 signal, and the DATA1 signal is transmitted to the storage capacitor C1 through the first switching transistor TFT 1. When the first switching transistor TFT1 is turned off, the energy storage capacitor C1 outputs an electrical signal to the gate of the first driving transistor TFT2, and controls the first driving transistor TFT2 to be turned on. At this time, the first driving circuit 242 outputs a current to the first backlight unit 212. The magnitude of the current output from the first driving circuit 242 to the first backlight unit 212 is positively correlated to the output voltage of the first output terminal of the power supply 230, and the magnitude of the current output from the first driving circuit 242 to the first backlight unit 212 is positively correlated to the channel width-to-length ratio of the first driving transistor TFT 2.

Fig. 13 is a schematic structural diagram of the second driving circuit 244 according to the fourth embodiment of the present application. As shown in fig. 13, the second driving circuit 244 may include: a second switching transistor TFT3, a second driving transistor TFT4 and a storage capacitor C2. A first electrode of the second driving transistor TFT4 is the input end e of the second driving circuit 244, that is, a first electrode of the second driving transistor TFT4 is connected to the second output end b of the power supply 230. The second pole of the second driving transistor TFT4 is the output terminal f of the second driving circuit 244, that is, the second pole of the second driving transistor TFT4 is connected to the second backlight unit 214. A first pole of the second switching transistor TFT3 is used for inputting a DATA2 signal, a second pole of the second switching transistor TFT3 is connected to a control pole of the second driving transistor TFT4, and the control pole of the second switching transistor TFT3 is used for inputting a SCAN2 signal. Both the SCAN2 signal and the DATA2 signal may be output by the controller 220. The storage capacitor C2 is connected between the control electrode and the second electrode of the second drive transistor TFT 4.

When the second driving circuit 244 is operated, the controller 220 outputs the SCAN2 signal to control the second switching transistor TFT3 to be turned on. When the second switching transistor TFT3 is turned on, the controller 220 outputs a DATA2 signal, and the DATA2 signal is transmitted to the storage capacitor C2 through the second switching transistor TFT 3. When the second switching transistor TFT3 is turned off, the energy storage capacitor C2 outputs an electrical signal to the control electrode of the second driving transistor TFT4, and controls the second driving transistor TFT4 to be turned on. At this time, the second driving circuit 244 outputs a current to the second backlight unit 214. The magnitude of the current output from the second driving circuit 244 to the second backlight unit 214 is positively correlated with the output voltage of the second output terminal of the power supply 230, and the magnitude of the current output from the second driving circuit 244 to the second backlight unit 214 is positively correlated with the channel width-to-length ratio of the second driving transistor TFT 4.

In this way, under the condition that the channel width-length ratio of the first driving transistor TFT2 is greater than the channel width-length ratio of the second driving transistor TFT4, if the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller 220 may control the output voltage of the first output terminal a of the power supply 230 to be equal to the output voltage of the second output terminal b of the power supply 230, so that the current output from the first driving circuit 242 to the first backlight unit 212 is greater than the current output from the second driving circuit 244 to the second backlight unit 214, thereby achieving the purpose of controlling the light emitting luminance of the first backlight unit 212 to be greater than the light emitting luminance of the second backlight unit 214.

It should be noted that, in this embodiment, besides that the channel width-to-length ratio of the first driving transistor TFT2 is larger than that of the second driving transistor TFT4, other parameters in the first driving circuit 242 should be equal to other parameters in the second driving circuit 244, and the relevant parameters of the first backlight unit 212 should be equal to those of the second backlight unit 214. For example, the capacitance value of the energy storage capacitor C1 in the first driving circuit 242 should be equal to the capacitance value of the energy storage capacitor C2 in the second driving circuit 244; the light effect of the first backlight unit 212 is equal to the light effect of the second backlight unit 214; the resistance of the first backlight unit 212 should be equal to the resistance of the second backlight unit 214. That is, in this embodiment, the only difference between the first driving circuit 242 and the second driving circuit 244 is the channel width-to-length ratio of the first driving transistor TFT2 and the channel width-to-length ratio of the second driving transistor TFT4 for the purpose of making the light emission luminance of the first backlight unit 212 greater than the light emission luminance of the second backlight unit 214 by controlling the output voltage of the first output terminal a of the power supply 230 to be equal to the output voltage of the second output terminal b of the power supply 230.

The second specific implementation manner of the third embodiment that "when the target gray levels of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller 220 controls the first driving circuit 242 to output a current to the first backlight unit 212 that is greater than the current output by the second driving circuit 244 to the second backlight unit 214" is explained in detail as follows:

example five:

fig. 14 is a circuit diagram of a connection relationship of the first driving circuit 242 according to the fifth embodiment of the present application. As shown in fig. 14, the backlight module 20 further includes a first resistor R1. A first terminal of the first resistor R1 is connected to the output terminal d of the first driving circuit 242, and a second terminal of the resistor R1 is connected to the first backlight unit 212. Fig. 15 is a circuit diagram of a connection relationship of the second driving circuit 244 according to the fifth embodiment of the present application. As shown in fig. 15, the backlight module 20 further includes a second resistor R2. A first terminal of the second resistor R2 is connected to the output terminal f of the second driving circuit 244, and a second terminal of the resistor R2 is connected to the second backlight unit 214.

Thus, under the condition that the resistance of the first resistor R1 is smaller than the resistance of the second resistor R2, if the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller 220 can control the output voltage of the first output terminal a of the power supply 230 to be equal to the output voltage of the second output terminal b of the power supply 230, that is, control the output voltage of the first driving circuit 242 to be equal to the output voltage of the second driving circuit 244, so as to control the current output from the first driving circuit 242 to the first backlight unit 212 to be larger than the current output from the second driving circuit 244 to the second backlight unit 214, thereby achieving the purpose of controlling the light emitting brightness of the first backlight unit 212 to be larger than the light emitting brightness of the second backlight unit 214.

It should be noted that, in this embodiment, the relevant parameter of the first driving circuit 242 should be equal to the relevant parameter of the second driving circuit 244, and the relevant parameter of the first backlight unit 212 should be equal to the relevant parameter of the second backlight unit 214. For example, the capacitance value of the energy storage capacitor C1 in the first driving circuit 242 should be equal to the capacitance value of the energy storage capacitor C2 in the second driving circuit 244; the channel width to length ratio of the first drive transistor TFT2 should be equal to the channel width to length ratio of the second drive transistor TFT 2; the light effect of the first backlight unit 212 is equal to the light effect of the second backlight unit 214; the resistance of the first backlight unit 212 should be equal to the resistance of the second backlight unit 214. In this way, the purpose of making the brightness of the first backlight unit 212 greater than the brightness of the second backlight unit 214 by controlling the output voltage of the first output terminal a of the power supply 230 to be equal to the output voltage of the second output terminal b of the power supply 230 can be achieved.

The third specific implementation manner of the third embodiment in which the controller 220 controls the first driving circuit 242 to output a current to the first backlight unit 212 that is greater than the current output by the second driving circuit 244 to the second backlight unit 214 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same is explained in detail as follows:

example six:

in addition to the fourth and fifth embodiments, the controller 220 may control the output voltage of the first output terminal a of the power supply 230 to be greater than the output voltage of the second output terminal b of the power supply 230 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same. Thus, the purpose that the brightness of the first backlight unit 212 is greater than that of the second backlight unit 214 can be achieved.

Specifically, when the related parameter of the first driving circuit 242 is equal to the related parameter of the second driving circuit 244 and the related parameter of the first backlight unit 212 is equal to the related parameter of the second backlight unit 214, the controller 220 may control the output voltage of the first output terminal a of the power supply 230 to be greater than the output voltage of the second output terminal b of the power supply 230, so that the current output from the first driving circuit 242 to the first backlight unit 212 is greater than the current output from the second driving circuit 244 to the second backlight unit 214, so as to control the light emitting brightness of the first backlight unit 212 to be greater than the light emitting brightness of the second backlight unit 214.

In a specific embodiment, the controller 220 stores a first correspondence. The first corresponding relationship is the corresponding relationship between the target gray scale and the first voltage. For example, the first correspondence may be as shown in table 1 below:

TABLE 1

The first correspondence is applied to the first sub-pixel 112. As can be seen from table 1, when the target gray level of any one of the first sub-pixels 112 is 000, the output voltage of the first output terminal a of the power supply 230 is V0 for the first sub-pixel 112. When the target gray scale of any one of the first sub-pixels 112 is 018, the output voltage of the first output terminal a of the power supply 230 is V18 for the first sub-pixel 112. When the target gray scale of any one of the first sub-pixels 112 is 255, the output voltage of the first output terminal a of the power supply 230 is V255 for the first sub-pixel 112. When the controller 220 works, if any one of the first sub-pixels 112 needs to emit light, the controller 220 may obtain a corresponding first voltage from the first corresponding relationship according to the target gray scale of the first sub-pixel 112, and control the output voltage of the first output terminal a of the power supply 230 to be equal to the obtained first voltage.

The controller 220 also stores a second correspondence. The second corresponding relationship is the corresponding relationship between the target gray scale and the second voltage. For example, the second correspondence relationship may be as shown in table 2 below:

TABLE 2

The second correspondence applies to the other sub-pixels 114. As can be seen from Table 2, when the target gray level of any other sub-pixel 114 is 000, the output voltage of the second output terminal b of the power supply 230 is V0-0.15 for the other sub-pixel 114. When the target gray level of any other sub-pixel 114 is 009, the voltage outputted from the second output terminal b of the power supply 230 for the other sub-pixel 114 is V9-1.37. When the target gray scale of any other sub-pixel 114 is 016, the voltage outputted from the second output terminal b of the power supply 230 for the other sub-pixel 114 is V16-1.51.

In the first and second correspondences, when the target gray scale is in the range of 000 to 008, the second voltage in the second correspondence is 0.15V lower than the first voltage in the first correspondence for every 1 gray scale increase. When the target gray scale is 009 to 020, the second voltage in the second corresponding relationship is 0.02V smaller than the first voltage in the first corresponding relationship for every 1 gray scale increment. When the target gray scale is from 021 to 220, the second voltage in the second corresponding relationship is 0.01V smaller than the first voltage in the first corresponding relationship for every 1 gray scale increase. When the target gray scale is in the range of 220 to 225, the second voltage in the second corresponding relationship is 0.02V lower than the first voltage in the first corresponding relationship for every 1 gray scale increase. When the target gray scale is in the range of 226 to 238, the second voltage in the second corresponding relationship is smaller than the first voltage in the first corresponding relationship by 0.03V for every 1 gray scale increment. When the target gray scale is in the range of 239 to 244, the second voltage in the second corresponding relationship is 0.04V less than the first voltage in the first corresponding relationship for every 1 gray scale increase. When the target gray scale is 245 to 247, the second voltage in the second corresponding relationship is 0.05V lower than the first voltage in the first corresponding relationship for every 1 gray scale increase. When the target gray scale is in the range of 248 to 255, the second voltage in the second corresponding relationship is 0.06V less than the first voltage in the first corresponding relationship for every 1 gray scale increase. That is, the first voltage corresponding to any target gray scale in the first corresponding relationship is greater than the second voltage corresponding to any target gray scale in the second corresponding relationship. When the controller 220 works, if any other sub-pixel 114 needs to emit light, the controller 220 may obtain a corresponding second voltage from the second corresponding relationship according to the target gray scale of the other sub-pixel 114, and control the output voltage of the second output terminal b of the power supply 230 to be equal to the obtained second voltage.

Another implementation manner of "the emission luminance of the first backlight unit 212 providing the first sub-pixel 112 with light source is greater than the emission luminance of the second backlight unit 214 providing the other sub-pixels 114 with light source when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same" is described below:

example seven:

the luminous efficiency refers to the luminous efficiency of the light emitting device. The unit of the luminous efficacy is lm/W (lumens per watt). That is, the light emitting device having a higher luminous efficiency has a higher emission luminance with the same emission power. In the embodiment of the present application, each first backlight unit 212 may be a micro LED or OLED lamp bead, and each second backlight unit 214 may be one or more LED lamp beads.

Thus, under the condition that the light efficiency of the first backlight unit 212 is greater than the light efficiency of the second backlight unit 214, if the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller 220 can control the power of the first backlight unit 212 to be equal to the power of the second backlight unit 214, so as to achieve the purpose of controlling the light emitting brightness of the first backlight unit 212 to be greater than the light emitting brightness of the second backlight unit 214. In general, the controller 220 may make the power of the first backlight unit 212 equal to the power of the second backlight unit 214 by controlling the output voltage of the first output terminal a of the power supply 230 to be equal to the output voltage of the second output terminal b of the power supply 230.

In some other embodiments, a brightness enhancement film may be further disposed on a side of the first backlight unit 212 close to the first sub-pixel 112 to enhance the brightness of the first sub-pixel 112. That is, a brightness enhancement film is disposed between the first backlight unit 212 and the first sub-pixel 112, so as to improve the brightness of the sub-pixel 110 connected to the first scan line in the array substrate 10. The brightness enhancement film may be an integrally formed prism, a composite brightness enhancement film, a multilayer brightness enhancement film, or the like.

The above-described embodiment four, embodiment five, embodiment six, and embodiment seven may be combined with each other.

Example eight:

the embodiment of the present application further provides a display device 30, as shown in fig. 16, including an array substrate 10 and the backlight module 20 as described in any of the above embodiments.

The array substrate 10 includes a plurality of sub-pixels 110 and a plurality of scan lines 140. A first scan line of the plurality of scan lines 140 is a first scan line 140 outputting a scan signal when the array substrate 10 operates. The plurality of sub-pixels 110 includes at least one first sub-pixel 112, and the first sub-pixel 112 is the sub-pixel 110 connected to the first scan line.

The backlight module 20 includes: a first backlight unit 212, a second backlight unit 214, and a controller 220. The first backlight unit 212 is used for providing a light source for the first sub-pixel 112, the second backlight unit 214 is used for providing a light source for the other sub-pixels 114 except the first sub-pixel 112 in the plurality of sub-pixels 110, and the controller 220 is used for controlling the light emitting brightness of the first backlight unit 212 and the second backlight unit 214. The controller 220 controls the light emitting brightness of the first backlight unit 212 to be greater than the light emitting brightness of the second backlight unit 214 when the target grayscales of the first sub-pixel 112 and the other sub-pixels 114 are the same.

In some embodiments, the plurality of sub-pixels 110 includes a plurality of first sub-pixels 112, the backlight module 20 includes a plurality of first backlight units 212, and the number of the plurality of first sub-pixels 112 is equal to the number of the plurality of first backlight units 212, and the plurality of first backlight units 212 are configured to provide light sources for the plurality of first sub-pixels 112 one by one.

In some embodiments, the plurality of sub-pixels 110 includes a plurality of first sub-pixels 112, the backlight module 20 includes a plurality of first backlight units 212, and the number of the plurality of first sub-pixels 112 is greater than the number of the plurality of first backlight units 212. One first backlight unit 212 of the plurality of first backlight units 212 is used to provide a light source for one first sub-pixel 112 of the plurality of first sub-pixels 112, or one first backlight unit 212 of the plurality of first backlight units 212 is used to provide a light source for adjacent ones of the plurality of first sub-pixels 112.

In some embodiments, the backlight module 20 further includes: a first driver circuit 242 and a second driver circuit 244. The input terminal of the first driving circuit 242 is connected to the first output terminal of the power supply 230, the output terminal of the first driving circuit 242 is connected to the first backlight unit 212, and when the first driving circuit 242 outputs current to the first backlight unit 212, the first backlight unit 212 emits light. The input terminal of the second driving circuit 244 is connected to the second output terminal of the power supply 230, the output terminal of the second driving circuit 244 is connected to the second backlight unit 214, and when the second driving circuit 244 outputs current to the second backlight unit 214, the second backlight unit 214 emits light. The controller 220 is further connected to the power supply 230, and the controller 220 is configured to control the output voltage of the first output terminal of the power supply 230 and the output voltage of the second output terminal of the power supply 230, so that when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the current output to the first backlight unit 212 by the first driving circuit 242 is greater than the current output to the second backlight unit 214 by the second driving circuit 244.

In some embodiments, the first driving circuit 242 includes a first driving transistor, a first pole of which is connected to the first output terminal of the power supply 230, and a second pole of which is connected to the first backlight unit 212. The second driving circuit 244 includes a second driving transistor having a first electrode connected to the second output terminal of the power supply 230 and a second electrode connected to the second backlight unit 214, and the channel width-to-length ratio of the first driving transistor is greater than that of the second driving transistor. The controller 220 controls the output voltage of the first output terminal of the power supply 230 to be equal to the output voltage of the second output terminal of the power supply 230 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same.

In some embodiments, the backlight module 20 further includes: a first resistor and a second resistor. A first terminal of the first resistor is connected to the output terminal of the first driving circuit 242, and a second terminal of the first resistor is connected to the first backlight unit 212. A first end of the second resistor is connected to the output end of the second driving circuit 244, a second end of the second resistor is connected to the second backlight unit 214, and a resistance value of the first resistor is smaller than a resistance value of the second resistor. The controller 220 controls the output voltage of the first output terminal of the power supply 230 to be equal to the output voltage of the second output terminal of the power supply 230 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same.

In some embodiments, the controller 220 controls the output voltage of the first output terminal of the power supply 230 to be greater than the output voltage of the second output terminal of the power supply 230 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same.

In some embodiments, the controller 220 stores a first corresponding relationship between the target gray level and the first voltage. The controller 220 is configured to: when the first sub-pixel 112 needs to emit light, a corresponding first voltage is obtained from the first corresponding relation according to the target gray scale of the first sub-pixel 112, and the output voltage of the first output terminal of the power supply 230 is controlled to be equal to the first voltage. The controller 220 stores a second corresponding relationship, where the second corresponding relationship is a corresponding relationship between the target gray levels and the second voltages, and a first voltage corresponding to any target gray level in the first corresponding relationship is greater than a second voltage corresponding to any target gray level in the second corresponding relationship. The controller 220 is configured to: when the other sub-pixels 114 need to emit light, the corresponding second voltages are obtained from the second corresponding relationship according to the target gray scales of the other sub-pixels 114, and the output voltage of the second output terminal of the power supply 230 is controlled to be equal to the second voltage.

In some embodiments, the light efficiency of the first backlight unit 212 is greater than the light efficiency of the second backlight unit 214. The controller 220 controls the power of the first backlight unit 212 to be equal to the power of the second backlight unit 214 when the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same.

In the embodiment of the present application, the backlight module 20 includes a first backlight unit 212, a second backlight unit 214, and a controller 220. The first backlight unit 212 is used for providing a light source for the first sub-pixel 112, the first sub-pixel 112 is a sub-pixel 110 connected to a first scan line, and the first scan line is a scan line 140 for outputting a first scan signal when the array substrate 10 is in operation. The second backlight unit 214 is used to provide light sources for the other sub-pixels 114 except the first sub-pixel 112. The controller 220 is used to control the light emitting luminance of the first backlight unit 212 and the second backlight unit 214. When the backlight module 20 is in operation, if the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the controller 220 controls the luminance of the first backlight unit 212 to be greater than the luminance of the second backlight unit 214. Thus, when the display device 30 works, under the condition that the target gray scales of the first sub-pixel 112 and the other sub-pixels 114 are the same, the light-emitting luminance of the first sub-pixel 112 connected to the first scan line in the array substrate 10 can be increased, so that the light-emitting luminance of the first sub-pixel 112 is closer to the light-emitting luminance of the other sub-pixels 114, and the display effect of the display device 30 is improved.

The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.

Claims

1. A backlight module is applied to a display device, and the display device comprises an array substrate, wherein the array substrate comprises a plurality of sub-pixels and a plurality of scanning lines; a first scanning line in the plurality of scanning lines is a scanning line which outputs a first scanning signal when the array substrate works; the plurality of sub-pixels include at least one first sub-pixel, which is a sub-pixel connected to the first scan line;

characterized in that, backlight unit includes: a first backlight unit for providing a light source to the first sub-pixel, a second backlight unit for providing a light source to the other sub-pixels except the first sub-pixel among the plurality of sub-pixels, and a controller for controlling light emitting luminance of the first backlight unit and the second backlight unit; and the controller controls the light-emitting brightness of the first backlight unit to be greater than that of the second backlight unit when the target gray scales of the first sub-pixel and the other sub-pixels are the same.

2. The backlight module as claimed in claim 1, wherein the plurality of sub-pixels comprises a plurality of first sub-pixels, the backlight module comprises a plurality of first backlight units, and the number of the plurality of first sub-pixels is equal to the number of the plurality of first backlight units, and the plurality of first backlight units are configured to provide light sources for the plurality of first sub-pixels one by one.

3. The backlight module of claim 1, wherein the plurality of sub-pixels comprises a plurality of first sub-pixels, the backlight module comprises a plurality of first backlight units, and the number of the plurality of first sub-pixels is greater than the number of the plurality of first backlight units, one of the plurality of first backlight units is configured to provide light sources for one of the plurality of first sub-pixels, or one of the plurality of first backlight units is configured to provide light sources for adjacent ones of the plurality of first sub-pixels.

4. A backlight module according to any one of claims 1 to 3, wherein the backlight module further comprises: a first drive circuit and a second drive circuit;

5. The backlight module according to claim 4, wherein the first driving circuit comprises a first driving transistor, a first pole of the first driving transistor is connected to the first output terminal of the power supply, and a second pole of the first driving transistor is connected to the first backlight unit;

6. The backlight module of claim 4, wherein the backlight module further comprises: a first resistor and a second resistor;

7. The backlight module as claimed in claim 4, wherein the controller controls the output voltage of the first output terminal of the power supply to be greater than the output voltage of the second output terminal of the power supply when the target gray levels of the first sub-pixel and the other sub-pixels are the same.

8. The backlight module as claimed in claim 7, wherein the controller stores a first corresponding relationship between a target gray level and a first voltage; the controller is configured to: when the first sub-pixel needs to emit light, acquiring a corresponding first voltage from the first corresponding relation according to the target gray scale of the first sub-pixel, and controlling the output voltage of a first output end of the power supply to be equal to the first voltage;

9. The backlight module according to any one of claims 1 to 3, wherein the light efficiency of the first backlight unit is greater than the light efficiency of the second backlight unit;

10. A display device comprising the array substrate and the backlight module according to any one of claims 1 to 9;