CN113433735A

CN113433735A - Backlight module, backlight plate, display screen and electronic equipment

Info

Publication number: CN113433735A
Application number: CN202110730260.4A
Authority: CN
Inventors: 胡赛峰
Original assignee: Shanghai Moruan Communication Technology Co Ltd
Current assignee: Shanghai Moruan Communication Technology Co Ltd
Priority date: 2021-06-29
Filing date: 2021-06-29
Publication date: 2021-09-24

Abstract

The application provides a backlight module, a backlight plate, a display screen and an electronic device. Wherein, backlight module includes: a plurality of MiniLED; each MiniLED of the plurality of minileds is non-serially connected with an adjacent MiniLED, and each MiniLED is serially connected with at least one MiniLED that is not adjacent. Based on the structure of backlight module of this application, do not establish ties between the adjacent miniLED, then after certain miniLED damaged, do not influence its normal demonstration of adjacent miniLED all around to can reduce luminance loss for prior art.

Description

Backlight module, backlight plate, display screen and electronic equipment

Technical Field

The application relates to the intelligent equipment technology, in particular to a backlight module, a backlight plate, a display screen and electronic equipment.

Background

The submillimeter light emitting diode (Mini LED) refers to an LED device with the chip size of 50-200 mu m. The Mini LED belongs to active self-luminous display, has high light utilization rate, excellent display effect, high response speed, relatively low power consumption and long service life.

Based on the above advantages, minileds have been gradually applied to various products. The LED backlight source can be used as a backlight source to be applied to products such as large-size display screens, smart phones, vehicle panels and electronic contest type notebooks, and can also be combined with RGB three-color LED chips to realize self-luminous display.

Some manufacturers have adopted MiniLED technology for the production and manufacture of products. For example, a certain number of minileds are arranged in the display screen, and are divided into a plurality of separate display areas, and a plurality of serial minileds are arranged in each display area.

The problem that this kind of arrangement brings is, in any subregion, as long as one MiniLED lamp is damaged, the MiniLED that connects with it in series in whole subregion can not light, leads to local too much luminance loss, causes to show the unusual.

Disclosure of Invention

The application provides a backlight module, a backlight plate, a display screen and electronic equipment, which are used for reducing the brightness loss caused by the damage of individual MiniLED.

In a first aspect, the present application provides a backlight module, comprising: a plurality of MiniLED;

each MiniLED of the plurality of minileds is non-serially connected with an adjacent MiniLED, and each MiniLED is serially connected with at least one MiniLED that is not adjacent.

Optionally, the backlight module is divided into a plurality of display areas, and each display area includes the plurality of minileds;

each MiniLED in a first display area in the plurality of display areas is respectively connected with one MiniLED in a second display area in the plurality of display areas in series, and the first display area is any one of the plurality of display areas;

the MiniLED in the first display area is not adjacent to the MiniLED in the second display area which is connected in series.

Optionally, the first display area is not adjacent to the second display area.

Optionally, the plurality of display areas are distributed in M rows and N columns, and the plurality of minileds in each display area are distributed in X rows and Y columns;

the MiniLED of the x row and the y column in the display area of the m row and the n column is connected in series with the MiniLED of the x row and the y column in the display area of the m row and the n + a column to form a series branch;

wherein M, N, X, Y are all positive integers; m is a positive integer less than or equal to M, a is a positive integer greater than or equal to 1 and less than N-1, N is a positive integer less than or equal to N-1, X is a positive integer less than or equal to X, and Y is a positive integer less than or equal to Y.

Optionally, one end of each of the series branches is connected to a positive electrode pin on the driving chip, and the other end of each of the series branches is connected to a plurality of negative electrode pins on the driving chip.

Optionally, one end of each of the series branches is connected to an anode pin on the driving chip, and the other end of the series branch where the minileds are located in the same display area is connected to the same cathode pin on the driving chip.

Optionally, one end of each series branch is connected to a positive electrode pin on the driving chip, and the other end of the series branch where the adjacent MiniLED is located is connected to a different negative electrode pin on the driving chip.

In a second aspect, the present application provides a backlight panel, including the backlight module of the first aspect and a driving chip.

In a third aspect, the present application provides a display screen, comprising: the backlight plate and the LCD of the second aspect.

In a fourth aspect, the present application provides an electronic device comprising: the display screen and the master control device of the third aspect.

Drawings

In order to more clearly illustrate the technical solutions in the present application or the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are 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 inventive exercise.

Fig. 1 is a schematic structural diagram of a conventional backlight module provided in the present application;

fig. 2 is a schematic diagram of an application scenario provided in the present application;

fig. 3 is a schematic structural diagram of a backlight module according to an embodiment of the present application;

fig. 4 is a schematic structural diagram of another backlight module according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of another backlight module according to an embodiment of the present application;

fig. 6 is a schematic diagram of a connection structure of a serial branch according to an embodiment of the present application;

fig. 7 is a schematic structural diagram of a backlight plate according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a display screen according to an embodiment of the present application.

Detailed Description

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

Some electronic equipment's display screen can set up some miniLEDs as the partly of board in a poor light, carries out the light filling for the display screen. In a production process, generally, the substrate is energized after all the wicks of the minileds are placed on the substrate, and quality inspection is performed by confirming the lighting condition of all the minileds. If a damaged MiniLED is found, rework may be scheduled. And (4) after the quality detection is not problematic, the subsequent process steps are required to be carried out, and fluorescent powder or a plasma film is added. After which even if the damaged MiniLED is re-discovered, it cannot be reworked. Therefore, the smaller the influence of the damage of the individual MiniLED on the display effect, the better.

However, in the prior art, in order to seek as few wirings as possible and as low cost as possible, the minileds are generally divided into sections, and the LEDs in each section are connected in series. The following description will briefly discuss a case of 10000 LEDs and 2500 divisions.

10000 LEDs are evenly divided into 2500 partitions, block 0001-block 2500, with 4 LEDs in each partition. Fig. 1 shows a wiring structure in which two blocks 0001 and 0002. As shown in fig. 1, the 4 LEDs in each partition are connected in 2 strings and 2 parallel. Wherein A is a positive electrode, and K1 and K2 are negative electrodes. The block 0001 is provided with four MiniLEDs of an LED1, an LED2, an LED5 and an LED6, wherein one end of the LED1 and the other end of the LED2 are connected to the A and the other end of the LED is connected to the K1 after being connected in series; LED5 and LED6 are connected in series, one end of the series is connected to A, and the other end of the series is connected to K2. The block 0002 is provided with four minileds, namely an LED3, an LED4, an LED7 and an LED8, wherein one end of the LED3 and the LED are connected to the a after being connected in series, and the other end of the LED is connected to the K1; LED7 and LED8 are connected in series, one end of the series is connected to A, and the other end of the series is connected to K2. In this connection, if the LED1 is broken and the circuit is broken, the LED2 connected in series with it will not be lit, resulting in dimming of the display regions corresponding to the LED1 and the LED 2.

In practical manufacturing processes, more lamps connected in series can reduce the number of A/K1/K2 leads, and can improve the production yield, which is also the current research direction. However, at the same time, the more lamps are connected in series, and when a lamp is damaged, the more lamps which are not affected, and the poorer the display effect.

In order to solve the problem, the application provides a backlight module, a backlight plate, a display screen and an electronic device, and aims to provide a new miniLED connection mode and reduce the brightness loss caused by the damage of a certain miniLED.

Fig. 2 is a schematic diagram of an application scenario provided in the present application. As shown in fig. 2, the display screen 100 of the terminal device is supplemented with light by using the backlight module 200 provided in the present application. The MiniLED is represented in fig. 2 by small squares in the backlight module 200, although the actual number may be more, and is only an example here. After a MiniLED in the backlight module 200 is damaged, other minileds connected in series with the MiniLED do not emit light, but the brightness of the display screen is less affected because the positions of the corresponding display screens are dispersed. The two black squares in the display screen 100 represent the damaged MiniLED and the MiniLED in series with it. Here, black is used only as an illustration of brightness contrast with the surroundings, and the difference in brightness in actual display is small.

The application provides a backlight module, including: a plurality of MiniLED; each MiniLED of the plurality of minileds is non-serially connected with an adjacent MiniLED, and each MiniLED is serially connected with at least one MiniLED that is not adjacent. Based on the structure of backlight module of this application, do not establish ties between the adjacent miniLED, then after certain miniLED damaged, do not influence its normal demonstration of adjacent miniLED all around to can reduce luminance loss for prior art.

Fig. 3 is a schematic structural diagram of a backlight module 200 according to an embodiment of the present application, and a connection relationship of a part of minileds is taken as an example to show a connection state of the backlight module 200. The LED11 is not connected in series with the adjacent LEDs 12, 21 and 22, but only connected in series with the non-adjacent LED 13. Other connections of the LEDs can be obtained with reference to fig. 3, and are not described in detail herein. This embodiment is presented as one of the possible examples, and is not intended to be limiting, in order to more intuitively illustrate the serial and non-serial states.

When the LED11 is damaged, the normal display of the adjacent surrounding LEDs 12, 21 and 22 is not affected, the concentrated brightness loss is avoided, and the better display effect can be ensured.

In some embodiments, the connection may still follow the existing partition manner, facilitating partition control during subsequent actual operation. The backlight module can be divided into a plurality of display areas, the display areas can be rectangular or in other shapes, and each display area comprises a plurality of MiniLED; each MiniLED in a first display area in the plurality of display areas is respectively connected with one MiniLED in a second display area in the plurality of display areas in series, and the first display area is any one of the plurality of display areas; the MiniLED in the first display area is not adjacent to the MiniLED in the second display area connected in series.

Specifically, the minileds in one display area may be connected to the minileds in another display area only, that is, there is a series relationship between the minileds in every two display areas; alternatively, a part of the minileds in one display area may be connected to the minileds in the other display area a, and a part of the minileds may be connected to the minileds in the other display area B, so that there may be a serial relationship between the minileds in each of the plurality of display areas.

In addition, the display area may be adjacent to another display area (between display areas in a serial relationship).

One implementation manner may be that a plurality of display areas are distributed in M rows and N columns, and a plurality of minileds in each display area are distributed in X rows and Y columns; the Y-th MiniLED in the x-th row in the display area of the m-th row and the n-th column is connected in series with the Y-th row in the display area of the m-th row and the n +1 column to form a series branch; wherein M, N, X, Y are all positive integers; m is a positive integer less than or equal to M, N is a positive integer less than or equal to N-1, X is a positive integer less than or equal to X, and Y is a positive integer less than or equal to Y.

Referring to fig. 4, fig. 4 is a schematic structural diagram of a backlight module adjacent to each other between display regions in a serial relationship. As shown in fig. 4, the backlight module 200 is divided into a plurality of rows and a plurality of columns of display regions. The 1 st row and 1 st column MiniLED (LED11) in the 1 st row and 1 st column display area is connected in series with the 1 st row and 1 st column MiniLED (LED13) in the 1 st row and 2 nd column display area and the 1 st row and 1 st column MiniLED … … in the 1 st row and 3 rd column display area to form a series branch. The row 1 and column 2 minileds (LED12) in the row 1 and column 1 display area are connected in series with the row 1 and column 2 minileds (LED14) … … in the row 1 and column 2 display area to form a series branch. The connection relationship of the minileds at other positions can be intuitively obtained from the figure, and is not described in detail herein.

It should be noted that this embodiment is only an example of one implementation manner, and other feasible implementations can be obtained according to the above description of the connection manner, and all of the implementations belong to the protection scope of the present application.

In addition, in the present application, the expression of rows and columns is used only as an expression of relative position relationship, and does not limit the actual direction corresponding to the backlight module. In practice, any orientation of the arrangement may be selected as a row or column.

The display area may also be non-adjacent to another display area (between display areas in a series relationship). If the display areas in the serial connection relation are not adjacent, the farther the distance is, the farther the display position on the corresponding display screen is, the more dispersed the brightness influence is, and the better the display effect is.

One implementation manner may be that a plurality of display areas are distributed in M rows and N columns, and a plurality of minileds in each display area are distributed in X rows and Y columns; the Y-th MiniLED in the x-th row in the display area of the m-th row and the n-th column is connected in series with the Y-th row in the display area of the m-th row and the n + a column to form a series branch; wherein M, N, X, Y are all positive integers; a is a positive integer which is larger than 1 and smaller than N-1, M is a positive integer which is smaller than or equal to M, N is a positive integer which is smaller than or equal to N-a, X is a positive integer which is smaller than or equal to X, and Y is a positive integer which is smaller than or equal to Y.

Referring to fig. 5, fig. 5 is a schematic structural diagram of a backlight module in which display regions in a serial relationship are not adjacent to each other. As shown in fig. 5, the backlight module 200 is divided into a plurality of rows and a plurality of columns. The MiniLED (LED11) in the 1 st row and the 1 st column in the display area in the 1 st row and the 1 st column is connected in series with the MiniLED (LED15) in the 1 st row and the 1 st column in the display area in the 1 st row and the 3 rd column to form a series branch. The connection relationship of the minileds at other positions can be intuitively obtained from the figure, and is not described in detail herein.

In the above embodiments, the connection relationship between the minileds inside the backlight module is mainly described, and thus the corresponding connection relationship is only schematically shown in the drawings.

In the practical application process, the backlight module needs to be connected to the driving chip, the driving chip provides a driving signal for the backlight module, and the MiniLED in the backlight module is driven to light up, so that the backlight module has a light supplementing effect.

Specifically, one end of each of the series branches is connected to a positive electrode pin on the driving chip, and the other end of each of the series branches is connected to one negative electrode pin of the plurality of driving pins on the driving chip.

Fig. 6 is a schematic diagram of a wiring structure of a series branch according to an embodiment of the present application, as shown in fig. 6, one end of the series branch formed by the LED2 and the LED4 is connected to an anode pin a on the driver chip, and the other end is connected to a cathode pin (driving pin) K1 on the driver chip, one end of the series branch formed by the LED6 and the LED8 is connected to the anode pin a on the driver chip, and the other end is connected to a cathode pin (driving pin) K1 on the driver chip, one end of the series branch formed by the LED1 and the LED3 is connected to the anode pin a on the driver chip, and the other end is connected to the cathode pin (driving pin) K2 on the driver chip, and one end of the series branch formed by the LED5 and the LED7 is connected to the anode pin a on the driver chip, and the other end is connected to the cathode pin (driving pin) K2 on the driver chip.

According to the different number of MiniLED in series in each series branch, the required voltage value of the series branch will be different, so the voltage value that the driving chip can provide will be matched with the required voltage value of the series branch.

In general, there are a plurality of output pins in the driving chip for outputting the driving signal, and the number of the serial branches may be larger, and there may be a plurality of serial branches required to be connected to the same driving pin (for example, the serial branch formed by the LED2 and the LED4 and the serial branch formed by the LED6 and the LED8 in the above example are both connected to the pin K1). According to the magnitude of the current value provided by the driving chip, the number of the series branches which can be connected at most by each driving pin can be determined.

In addition, in order to facilitate the control of the MiniLED by the driving chip and to enable the display effect to show the effect of zone control, the serial branches arranged at the adjacent positions can be connected to the same driving pin as much as possible. For example, the other end of the serial branch where the minileds are located in the same display area is connected to the same negative terminal pin on the driving chip.

In addition, in order to avoid the display problem caused by the output signal failure of a certain pin of the driving chip, the serial branch where the adjacent minileds are located can be connected to different negative electrode pins. Therefore, a certain pin fails, and the situation that a large-area MiniLED is not turned on is avoided.

According to the scheme, the MiniLED lamps connected in series are divided into different areas by changing the wiring, and if a certain MiniLED lamp is damaged, a local large-area dark lamp exists in the conventional scheme, but the scheme can disperse the bad degree; meanwhile, the phenomenon of poor display caused by the damage of the MiniLED lamp in production or after sale can be reduced.

Fig. 7 is a schematic structural view of a backlight plate according to an embodiment of the present application, and as shown in fig. 7, a backlight plate 700 includes a backlight module 200 and a driving chip 300. The driver chip 300 is configured to: receiving a brightness adjusting signal sent by a main board; the brightness adjusting signal is used for indicating a display area needing brightness adjustment; and generating a corresponding driving signal according to the brightness adjusting signal so as to drive the MiniLED in the corresponding display area to adjust the brightness.

According to the connection relationship between the serial branch and the driving chip in the backlight module, it can be known that the serial branch connected to each pin of the driving chip has an explicit position on the backlight module and respectively corresponds to a fixed display position on the display screen. Therefore, light needs to be supplemented to which position on the display screen, and only the driving signal needs to be output through the corresponding pin to drive the serial branch at the corresponding position on the backlight module to emit light.

For example, when a movie is watched, the picture frame is generally small relative to the display screen, the picture area needs to be supplemented with light, and the area without picture display is not supplemented with light, so that the brightness contrast is enhanced, and the movie watching effect is improved.

It should be noted here that the size of minileds is very small, and based on the scheme of this application, constitute the series branch between the non-adjacent minileds, in the control process, the condition that the region that lights on the backlight module and the region that the display screen needs the light filling do not completely correspond may appear, but through setting up the relation of connection rationally, can control the difference between few minileds, and this influence on the display effect is very little.

In other embodiments, the driver chip is further configured to: detecting a trip signal; and if the open circuit signal is detected, sending a prompt signal to the mainboard so that the mainboard sends prompt information.

The backlight plate of the embodiment adopts the backlight module in the above embodiment, so that the same technical effect can be achieved, and further description is omitted.

The application also provides a display screen which comprises the backlight plate and the LCD in the embodiment.

Fig. 8 is a schematic structural diagram of a display screen according to an embodiment of the present application, as shown in fig. 8, a display screen 800 includes a flexible circuit board 801, an iron frame 802, a reflective sheet 803, a backlight module 200, a light guide plate 804, a diffusion sheet 805, a lower brightness enhancement film 806, an upper brightness enhancement film 807, a light-shielding black glue 808, a lower polarizer 809, an LCD810, an upper polarizer 811, an OCA812, and a cover plate 813. The backlight panel 700 is composed of a flexible circuit board 801, an iron frame 802, a reflector 803, the backlight module 200, a light guide plate 804, a diffuser 805, a lower brightness enhancement film 806, an upper brightness enhancement film 807 and a black shading adhesive 808.

The display screen of the embodiment adopts the backlight module in the above embodiment, so that the same technical effect can be achieved, and further description is omitted here.

The present application further provides an electronic device, comprising: such as the display screen and the master control device in the above embodiments.

The display screen in the electronic device of this embodiment adopts the backlight module in the above embodiments, so the same technical effects can be achieved, and details are not described here.

Those of ordinary skill in the art will understand that: all or a portion of the steps of implementing the above-described method embodiments may be performed by hardware associated with program instructions. The program may be stored in a computer-readable storage medium. When executed, the program performs steps comprising the method embodiments described above; and the aforementioned storage medium includes: various media that can store program codes, such as ROM, RAM, magnetic or optical disks.

Finally, it should be noted that: the above 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 or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A backlight module, comprising: a plurality of MiniLED;

2. The module of claim 1, wherein the backlight module is divided into a plurality of display areas, each display area comprising the plurality of MiniLED;

3. The module of claim 2, wherein the first display area is not adjacent to the second display area.

4. The module according to claim 2 or 3, wherein the plurality of display areas are distributed in M rows and N columns, and the plurality of MiniLED in each display area are distributed in X rows and Y columns;

5. The module of claim 4,

one end of each series branch is connected to a positive electrode pin on the driving chip, and the other end of each series branch is connected to a plurality of negative electrode pins on the driving chip respectively.

6. The module of claim 4,

one end of each series branch is connected to a positive electrode pin on the driving chip, and the other end of the series branch where the MiniLED is located in the same display area is connected to the same negative electrode pin on the driving chip.

7. The module of claim 4,

one end of each series branch is connected to a positive electrode pin on the driving chip, and the other end of the series branch where the adjacent miniLED is located is connected to different negative electrode pins on the driving chip.

8. A backlight panel comprising the backlight module of any one of claims 1 to 7 and a driving chip.

9. A display screen, comprising: the backlight panel and the liquid crystal display LCD of claim 8.

10. An electronic device, comprising: the display screen and master control device of claim 9.