CN109164641B

CN109164641B - Backlight module and display device

Info

Publication number: CN109164641B
Application number: CN201811276008.5A
Authority: CN
Inventors: 柯思超; 邓卓
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2018-10-30
Filing date: 2018-10-30
Publication date: 2021-04-02
Anticipated expiration: 2038-10-30
Also published as: CN109164641A

Abstract

The invention discloses a backlight module and a display device, and relates to the technical field of display. In the embodiment of the invention, the dimming area is divided into a compensation dimming area and a normal dimming area, wherein the compensation dimming area is arranged close to the edge area of the LED substrate, the normal dimming area is arranged far away from the edge area, in the white light test stage, the luminance of the compensation dimming area is the same as that of the normal dimming area, and the number of the LED chips in the compensation dimming area is smaller than that in the normal dimming area; therefore, the uniformity of the brightness of each dimming area in the test stage can be ensured, and the brightness difference between the edge area and the middle area is reduced, so that the display effect of the liquid crystal display screen is improved in the actual display process.

Description

Backlight module and display device

Technical Field

The present invention relates to the field of display technologies, and particularly to a backlight module and a display device.

Background

The lcd is a non-self-luminous device, and needs to provide a backlight source through a backlight module, so as to realize a display function. At present, the LED substrate provided with a plurality of mini LED chips arranged in an array is adopted to form the backlight module, and the backlight module can enable the liquid crystal display screen to have the screen effect with a high dynamic range and has the characteristics of more fine and smooth display pictures and the like.

However, due to the difference in light gathering properties, the brightness difference exists between the edge area and the middle area of the LED substrate, which causes the brightness of the entire backlight module to be uneven, and affects the display effect. Therefore, how to reduce the difference and improve the display effect is a technical problem that needs to be solved urgently by those skilled in the art.

Disclosure of Invention

The embodiment of the invention provides a backlight module and a display device, which are used for improving the display effect of a liquid crystal display.

In a first aspect, an embodiment of the present invention provides a backlight module, including an LED substrate, where the LED substrate includes a plurality of LED chips; the LED substrate comprises a plurality of dimming areas, and each dimming area comprises at least one LED chip;

the plurality of dimming zones comprises: the compensation dimming area is arranged close to the edge area of the LED substrate, and the normal dimming area is arranged far away from the edge area;

in a white light testing stage, the light emitting brightness of the compensation dimming area is equal to that of the normal dimming area, and the number of the LED chips included in the compensation dimming area is smaller than that of the LED chips included in the normal dimming area.

In a second aspect, an embodiment of the present invention provides a display device, including: the display panel and the backlight module provided by the embodiment of the invention are provided.

The invention has the following beneficial effects:

according to the backlight module and the display device provided by the embodiment of the invention, the dimming area is divided into the compensation dimming area and the normal dimming area, and the luminance of the compensation dimming area is the same as that of the normal dimming area in the white light test stage, so that the luminance uniformity of each dimming area in the test stage can be ensured, and the luminance difference between the edge area and the middle area is reduced, thereby being beneficial to improving the display effect of the liquid crystal display screen in the actual display process.

Drawings

Fig. 1 is a schematic structural diagram of LED chips having the same area and an LED substrate having a rectangular shape according to an embodiment of the present invention;

fig. 2 is a schematic structural view of the LED chips provided in the embodiment of the present invention, wherein the areas of the LED chips are the same, and the LED substrate is a rounded rectangle;

fig. 3 is a schematic structural view of the LED chips having the same area and the LED substrate having a special shape according to the embodiment of the present invention;

fig. 4 is one of schematic structural diagrams of an LED substrate provided with a compensation LED chip according to an embodiment of the present invention;

FIG. 5 is an enlarged schematic view of the dashed box labeled 3a6 in FIG. 4;

fig. 6 is a second schematic partial structure diagram of an LED substrate provided with a compensation LED chip according to an embodiment of the present invention;

FIG. 7 is an enlarged schematic view of the dashed box labeled 3a7 in FIG. 6;

FIG. 8 is another enlarged schematic view of the dashed box labeled 3a7 in FIG. 6;

fig. 9 and fig. 10 are schematic structural views of a display device provided in an embodiment of the present invention, respectively.

Detailed Description

The following description will be made in detail with reference to the accompanying drawings for describing a specific embodiment of a backlight module and a display device according to an embodiment of the present invention. It should be noted that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The inventor finds in research that, in order to improve the display effect of the liquid crystal display, the LED substrate in the backlight module may be generally configured in a partitioned manner, that is, the LED substrate is partitioned into a plurality of dimming areas, each dimming area includes 3 × 3 LED chips or 6 × 6 LED chips, and a local dimming manner is used to achieve a high dynamic range screen effect and a finer display image. Simultaneously, still can provide the area source of high luminance for liquid crystal display panel, promote backlight unit's luminance to, through the mode of regional dimming, can also reduce backlight unit's consumption, thereby reduce whole liquid crystal display's consumption.

However, due to the difference in light gathering properties, the edge area and the middle area of the LED substrate have a brightness difference, that is, the brightness of the edge area is significantly lower than that of the middle area, so that the edge area is visually darker, and the display effect of the liquid crystal display panel is finally affected.

Therefore, the embodiment of the invention provides a backlight module for reducing the brightness difference between the edge area and the middle area and improving the display effect of the liquid crystal display screen.

Specifically, an embodiment of the invention provides a backlight module, as shown in fig. 1 to 8, where fig. 1 is a schematic structural diagram in which an LED substrate is rectangular and areas of LED chips are the same, fig. 2 is a schematic structural diagram in which an LED substrate is rectangular and areas of LED chips are the same, fig. 3 is a schematic structural diagram in which an LED substrate is in a special shape and areas of LED chips are the same, fig. 4 and 6 are schematic structural diagrams of an LED substrate in which compensation LED chips are disposed, fig. 5 is an enlarged schematic diagram of a dashed-line frame marked as 3a6 in fig. 4, fig. 7 is an enlarged schematic diagram of a dashed-line frame marked as 3a7 in fig. 6, and fig. 8 is another enlarged schematic diagram of a dashed-line frame marked as 3a7 in fig. 6.

Referring to fig. 1 to 8, the backlight module may include an LED substrate 1, where the LED substrate 1 includes a plurality of LED chips (2 or 2a or 2 b); the LED substrate 1 comprises a plurality of dimming areas 3, the dimming areas 3 comprise at least one LED chip (2 or 2a or 2b), only part of the LED chips are shown in the figure 1, the dimming area marked as 3a0 comprises one LED chip 2(2a), and the dimming areas marked as 3a1 and 3b comprise a plurality of LED chips 2(2 a);

the plurality of dimming areas 3 includes: a compensation dimming zone (e.g., 3a0, 3a1, 3a2, 3a3, 3a4, 3a5, 3a6, and 3a7) disposed near an edge region of the LED substrate 1, and a normal dimming zone (e.g., 3b) disposed far from the edge region;

in the white light testing stage, the light emitting brightness of the compensation dimming zone (such as 3a0, 3a1, 3a2, 3a3, 3a4, 3a5, 3a6 and 3a7) is equal to that of the normal dimming zone 3b, and the number of the LED chips (2 or 2a or 2b) included in the compensation dimming zone (such as 3a0, 3a1, 3a2, 3a3, 3a4, 3a5, 3a6 and 3a7) is smaller than that of the LED chips (2 or 2a or 2b) included in the normal dimming zone 3 b.

In practical cases, when each dimming region includes 3 × 3 LED chips (as shown in fig. 1 and 3), or 6 × 6 LED chips (as shown in fig. 2), or M × N LED chips (not shown), M and N are positive integers, and the coverage length of each dimming region in the transverse direction or the longitudinal direction may be generally more than 3 mm; moreover, the brightness of the edge area is dark due to the light gathering effect, and the dark distance is about 1.5 mm to 2 mm from the edge of the LED substrate if An/An +1 > 3%.

Where "An" in "An/An +1 > 3%" indicates a test point, and "An/An +1 > 3%" indicates that the human eye can visually perceive a difference in luminance when the luminance ratio between the current test point and the next test point is greater than 3%. In this way, therefore, a range of darker regions can be determined to facilitate the division and setting of the compensation dimming zone.

Therefore, for the dimming region setting of the edge region, a different setting from that of the dimming region of the middle region is adopted, that is, the dimming region of the edge region is referred to as a compensation dimming region (e.g., 3a0, 3a1, 3a2, 3a3, 3a4, 3a5, 3a6, and 3a7), the dimming region of the middle region is referred to as a normal dimming region 3b, and the number of LED chips included in the compensation dimming region (e.g., 3a0, 3a1, 3a2, 3a3, 3a4, 3a5, 3a6, and 3a7) is made smaller than the number of LED chips included in the normal dimming region 3b, as shown in fig. 1 to 8, which can be advantageous for reducing the luminance difference between the edge region and the middle region. Therefore, the display effect of the liquid crystal display screen is improved in the actual display process.

In specific implementation, in the embodiment of the present invention, the setting of the compensation dimming area and the normal dimming area may be set in two ways, namely, way 1 and way 2.

Mode 1: the areas of the LED chips are equal regardless of the compensation dimming area or the normal dimming area. As shown in fig. 1 to 3, the LED chips in the LED substrate 1 have the same area size, and the compensation dimming region is different from the normal dimming region only in the number of the included LED chips.

For example, referring to fig. 1, in the compensation dimming region labeled 3a0, the compensation dimming region labeled 3a1 includes one LED chip (2 or 2a), the compensation dimming region labeled 3a1 includes 3 LED chips (2 or 2a), and the normal dimming region labeled 3b includes 9 LED chips (2 or 2a), wherein the normal dimming region labeled 3b includes a larger number of LED chips (2 or 2a) than the compensation dimming region labeled 3a0 includes, and at the same time, a larger number of LED chips (2 or 2a) than the compensation dimming region labeled 3a includes.

For another example, referring to fig. 3, the compensation dimming area labeled 3a4 includes 4 LED chips, the compensation dimming area labeled 3a5 includes 2 LED chips, and the normal dimming area labeled 3b includes 9 LED chips.

Also, when the arrangement of the LED chips included in the normal dimming region 3b is 3 × 3 (as shown in fig. 1 and 3), the arrangement of the LED chips included in the compensation dimming region may be 1 × 3 (as shown in 3a 1), or 3 × 1, or 2 × 1 (as shown in 3a 5), or 2 × 2 (as shown in 3a2), etc.; if the LED chips included in the normal dimming region 3b are arranged in a6 × 6 manner (as shown in fig. 2), the arrangement of the LED chips included in the compensation dimming region may be 1 × 6 (as shown in fig. 3a 3), or 6 × 1, or 7 × 1 (as shown in fig. 3a 2). That is, the arrangement of the LED chips included in the compensation dimming region may be determined according to a specific practical situation, and is not limited herein.

According to the arrangement, the total number of the LED chips (2 or 2a) arranged in the LED substrate 1 does not need to be changed, and only the dividing method of the dimming area needs to be changed, so that the arrangement mode is simple in manufacturing process, low in manufacturing cost, simple and easy to implement, and the dimming area can be flexibly divided according to the shape of the LED substrate; meanwhile, the brightness difference between the edge area and the middle area can be reduced, and the display effect of the liquid crystal display screen can be improved.

In this aspect, in order to further improve the problem of the brightness in the edge area being too dark, the driving current may be set in the embodiment of the present invention. Specifically, in the white light testing stage, the driving current input to the LED chip in the compensation dimming area may be greater than the driving current input to the LED chip in the normal dimming area.

This is because the quantity of the LED chips included in the compensation dimming area is small, and in the white light test stage, if the driving current provided for the compensation dimming area is the same as the driving current provided for the normal dimming area, the luminance of the compensation dimming area is darker than that of the normal dimming area, so in this way, by increasing the driving current provided for the compensation dimming area, in the white light test stage, the luminance difference between the compensation dimming area and the normal dimming area can be effectively reduced, and further, the luminance difference between the edge area and the middle area can be effectively reduced, and the light emitting uniformity of the LED substrate 1 is greatly improved, thereby improving the display effect of the liquid crystal display.

Specifically, the ratio between the driving current input to the LED chip in the compensation dimming area and the driving current input to the LED chip in the normal dimming area may be determined according to actual conditions, as long as it can be ensured that the driving current input to the LED chip in the compensation dimming area is greater than the driving current input to the LED chip in the normal dimming area, and the light emitting brightness of the normal dimming area is consistent with that of the compensation dimming area in the white light testing stage, which is not limited herein.

Specifically, taking the normal dimming area labeled as 3b in fig. 3 as an example, the connection relationship between each LED chip and the cathode signal line and the anode signal line in the dimming area is described, for the normal dimming area 3b, which includes 9 LED chips, every 3 LED chips may be connected in series to form one LED chip group (e.g., z1), and then three LED chip groups (e.g., z1) are connected in parallel between the cathode signal line (e.g., a1) and the anode signal line (e.g., K1). For the compensation dimming area 3a4, two LED chips may be connected in series to form an LED chip group (e.g., z2), and then each LED chip group is connected in parallel between a cathode signal line (e.g., a2) and an anode signal line (e.g., K2).

Of course, for the compensation dimming area, when the number of LED chips is large, the connection manner between each LED chip and the cathode signal line and the anode signal line in the compensation dimming area as labeled as 3a4 may be adopted, each LED chip may be connected in series between the cathode signal line and the anode signal line, or the number of LED chips included in each LED chip set may be set to be different.

It should be noted that the backlight module configured in this way can be applied to display panels of any shape, such as a rectangular display panel, a triangular display panel, a polygonal display panel, or a display panel with rounded corners, as long as the shape of the LED substrate 1 is consistent with the shape of the display panel, for example, the shape of the LED substrate 1 in the backlight module is rectangular (as shown in fig. 1), triangular, polygonal, or a shape with rounded corners (as shown in fig. 2 and 3), which is not limited herein.

Mode 2: for the display panel with non-right-angle corners, the LED substrate 1 may also be configured in the same shape, that is, the LED substrate 1 also has non-right-angle corners, and at this time, if the brightness difference between the edge area and the middle area close to the non-right-angle corners is larger according to a general partition manner, a sawtooth effect may be generated at the non-right-angle corners, which affects the display effect.

Therefore, in order to further reduce the brightness difference between the edge area and the middle area near the non-right-angle corner and improve the saw-tooth effect, the LED chip with a smaller area may be disposed at the edge area near the non-right-angle corner, and the normal LED chip is used in the middle area, so as to compensate the non-right-angle corner position and further improve the light emitting uniformity of the LED substrate 1.

Specifically, in the embodiment of the present invention, as shown in the schematic partial structural diagrams of the LED substrate shown in fig. 4 to 8, the LED substrate 1 may include at least one non-right-angled corner 4; also, in this case, the LED chip 2 may include a compensation LED chip 2b, and a normal LED chip 2 a; the compensation LED chip 2b is arranged on one side, close to the non-right-angle corner 4, of the normal LED chip 2a, and the area of the compensation LED chip 2b is smaller than that of the normal LED chip 2 a; the compensation dimming area (as shown in 3a6 and 3a7) comprises at least one compensation LED chip 2b, and the normal dimming area 3b comprises a plurality of normal LED chips 2 a.

The area of the normal LED chip 2a may be set to 150 micrometers × 500 micrometers, and the area of the compensation LED chip 2b may be set to 140 micrometers × 240 micrometers; of course, the area of the normal LED chip 2a and the compensation LED chip 2b is not limited to this, and may be other sizes according to actual needs.

In particular, the set number of the compensation LED chips included in each compensation dimming region may be determined according to a specific practical situation.

For example, as the compensation dimming area labeled 3a6 shown in fig. 4 and 5, the compensation dimming area 3a6 may include only a plurality of compensation LED chips 2b (sparse black dot filled area), that is, only 8 compensation LED chips 2b are included in 3a6, and the normal LED chips 2a are not included.

Referring to a partial enlarged schematic diagram of fig. 5, 3a6, in this way, only one cathode signal line a22 (for providing cathode signals to LED chips) and one anode signal line K22 (for providing anode signals to LED chips) may be provided for such compensation dimming area (e.g. 3a6), and the same driving current is provided to each compensation LED chip inside the compensation dimming area, and 8 compensation LED chips 2b in 3a6 are connected between a22 and K22, so as to ensure consistent light emitting brightness of each LED chip in the compensation dimming area, and at the same time, reduce wiring, thereby avoiding short circuit and mutual interference caused by excessive wiring.

For another example, as shown in fig. 6 to 8, the compensation dimming area labeled as 3a7 may include both the compensation LED chip 2b and the normal LED chip 2a, and the number of the compensation LED chips 2b and the normal LED chips 2a may be determined according to the angle of the non-right-angle corner 4.

At this time, for each compensation dimming area, in order to ensure that the light-emitting brightness of the compensation LED chip is equal to that of the normal LED chip, two sets of signal lines need to be provided for each compensation dimming area, that is, for each compensation dimming area, the compensation LED chip 2b and the normal LED chip 2a need to be electrically connected to different cathode signal lines, and similarly, the compensation LED chip 2b and the normal LED chip 2a need to be electrically connected to different anode signal lines.

For example, referring to a compensation dimming area 3a7 shown in fig. 7, a region filled with oblique lines indicates a normal LED chip 2a, and a region filled with sparse black dots indicates a compensation LED chip 2b, and the compensation dimming area includes 4

normal LED chips

2a and 3 compensation LED chips 2b, wherein, for the compensation dimming area, two sets of cathode signal lines (indicated by a12 and a22, respectively) inputting different cathode signals and two sets of anode signal lines (indicated by K12 and K22, respectively) inputting different anode signals are provided, that is, the compensation LED chip 2b is electrically connected to the normal LED chip 2a with different cathode signal lines, respectively, and is electrically connected to the different anode signal lines, respectively, that is, each normal LED chip 2a is electrically connected to a12 and K12, and each compensation LED chip 2b is electrically connected to a22 and K22, respectively.

In this way, different driving currents can be provided to the compensation LED chip 2b and the normal LED chip 2a, that is, for each compensation dimming area, the driving current input to the compensation LED chip 2b is greater than the driving current input to the normal LED chip 2a, so as to avoid that the light emitting brightness is dark due to the smaller size of the compensation LED chip 2b when the same driving current is provided, and thus the light emitting brightness of each LED chip located in the compensation dimming area is consistent.

Of course, for each of the normal dimming areas, since only the normal LED chips 2a are included therein and the areas are all the same, when the same driving current is supplied to the respective LED chips, the light emitting luminance of the respective normal LED chips 2a may be all the same. Therefore, the driving current input to each of the normal LED chips 2a is the same for each of the normal dimming areas.

Alternatively, when a plurality of normal LED chips 2a and at least one compensation LED chip 2b are included in the compensation dimming region, the number of the normal LED chips 2a therein may be generally set to an even number (e.g., 3a6 shown in fig. 4 and 5, and 3a7 shown in fig. 6 to 8), which may facilitate wiring. And for each light adjusting area (including a compensation light adjusting area and a normal light adjusting area), at least two normal LED chips 2a are connected in series to form a normal LED chip set, and the normal LED chip sets are connected in parallel.

Referring to fig. 7, the 4 normal LED chips 2a connected between a12 and K12 are two normal LED chips 2a connected in series to form a normal LED chip group 5, i.e. 2 normal LED chip groups 5, and then the 2 normal LED chip groups 5 are connected in parallel between a12 and K12.

Referring to fig. 8, 4 normal LED chips 2a connected between a12 and K12 are connected in series between a12 and K12.

Referring to the normal dimming area marked 3b in fig. 4, the normal dimming area includes 9 normal LED chips 2a, wherein three normal LED chips 2a are connected in series to form one normal LED chip group 6, and then three normal LED chip groups 6 are connected in parallel between a11 and K11. A11 denotes a cathode signal line, K11 denotes an anode signal line, fig. 4 only shows a normal dimming area labeled as 3b, which shows the connection relationship between each normal LED chip 2a and the cathode signal line and the anode signal line, and the connection relationship between each normal LED chip 2a and the cathode signal line and the anode signal line included in the remaining normal dimming areas can refer to 3b, and the repeated parts are not repeated.

Specifically, in the embodiment of the present invention, for each of the compensation dimming zones: each compensation LED chip is connected in series; or even number of the compensation LED chips are connected in series to form a compensation LED chip group, and the compensation LED chip groups are connected in parallel.

Referring to fig. 7 and 8, the compensation dimming area 3a7 includes three compensation LED chips 2b connected in series between a22 and K22. Referring to fig. 5 showing a compensation dimming area 3a6 including only compensation LED chips 2b, two compensation LED chip groups 7 are connected in series, and then a plurality of compensation LED chip groups 7 are connected in parallel between a21 and K21. Here, a21 denotes a cathode signal line, and K21 denotes an anode signal line.

It should be noted that fig. 5 only illustrates a case where two compensation LED chip sets can be formed by connecting two compensation LED chip sets in series, and certainly, four compensation LED chip sets can be formed by connecting four compensation LED chip sets in series, or six compensation LED chip sets can be formed by connecting six compensation LED chip sets in series.

It should be noted that, regarding the cathode signal line and the anode signal line mentioned in fig. 3, 4, 5, 7 and 8, the connection relationship between the various LED chips and the cathode signal line and the anode signal line is only illustrated in the figures, and the specific wiring manner of the cathode signal line and the anode signal line on the LED substrate is not limited. In an actual manufacturing process, the cathode signal line and the anode signal line may be provided according to a specific actual situation, and are not limited herein.

Therefore, in the mode 2, the compensation LED chip is arranged at the position close to the non-right-angle corner 4, so that the brightness compensation can be carried out on the non-right-angle corner 4, the sawtooth phenomenon is avoided, and the display effect is improved; in addition, the size of the compensation LED chip is small in the arrangement mode, and the size of the compensation LED chip can be set according to actual conditions, so that the arrangement mode has high flexibility and is suitable for LED substrates in various shapes, and the application range of the backlight module is greatly widened.

In specific implementation, in the embodiment of the present invention, regardless of the above mode 1 or mode 2, for each LED chip (including the normal LED chip and the compensation LED chip) on the LED substrate 1, the distance between the normal LED chip and the compensation LED chip may be set to be 0.5 mm to 4 mm, so that while mutual interference between two adjacent LED chips is avoided, a better backlight source may be provided for the liquid crystal display panel through the LED chips, and the display effect of the liquid crystal display panel is improved.

Optionally, in the embodiment of the present invention, a distance between the LED chips (including the normal LED chip and the compensation LED chip) may be set to be between 0.8 mm and 2 mm, so that a more excellent backlight source may be provided for the liquid crystal display panel, and a display effect of the liquid crystal display panel is further improved.

Specifically, in the embodiment of the present invention, the LED chip may be a blue LED chip, and the wavelength of the chip may be selected between 440 nanometers and 460 nanometers. The light emitting range of each LED chip is set in a smaller range, namely, the light emitting colors of the LED chips are basically the same, so that the backlight module can be suitable for liquid crystal display panels with any pixel size, has a larger application range and has stronger operation flexibility.

In the embodiment of the present invention, the orthographic projection shapes of the normal dimming region and the compensation dimming region on the LED substrate 1 may be any shapes, and may be set according to specific practical situations. For example, the orthographic projection shape of the normal dimming region on the LED substrate 1 may be a square shape as shown in fig. 1 to 4, and for example, the orthographic projection shape of the normal dimming region on the LED substrate 1 may be a rectangle shape as shown in fig. 6 as the normal dimming region labeled 3 b; accordingly, the orthographic projection shape of the compensation dimming region on the LED substrate 1 may be set to any shape, such as a rectangle as shown in fig. 1, a trapezoid as shown in fig. 7 and 8, and a special shape as shown in fig. 5.

Moreover, it should be noted that the backlight module may further include, besides the LED substrate 1, structures for implementing other functions in the backlight module, such as a light emitting surface fluorescent film, a diffusion sheet, and a brightness enhancement film sequentially disposed on the LED substrate 1, and specific arrangement modes and implementation modes of these structures may refer to the prior art, which are not described herein again.

Based on the same inventive concept, an embodiment of the present invention further provides a display device, as shown in fig. 9 and fig. 10, which is a schematic structural diagram of the display device, and as shown in fig. 9, the display device may include: the display panel 10 and the backlight module 20 provided in the embodiments of the present invention, the display panel 10 is disposed on a light emitting surface of the backlight module 20.

The display panel 10 may be a liquid crystal display panel, and the backlight source provided by the backlight module 20 is helpful for the liquid crystal display panel 10 to realize a display function.

Also, referring to fig. 9, the liquid crystal display panel 10 may include an array substrate 11, an opposite substrate 12 opposite to the array substrate 11, and a liquid crystal layer 13 between the array substrate 11 and the opposite substrate 12. The liquid crystal layer 13 includes a plurality of liquid crystal molecules (e.g., oval areas filled with vertical lines), and the liquid crystal molecules are rotated by applying a certain voltage to the liquid crystal molecules, so that the backlight provided by the backlight module 20 passes through the liquid crystal molecules 13 and is emitted, thereby implementing the display function of the liquid crystal display panel 10.

In specific implementation, in the embodiment of the present invention, the display device may be: any product or component with a display function, such as a mobile phone (as shown in fig. 10), a tablet computer, a television, a display, a notebook computer, a digital photo frame, and a navigator. The implementation of the display device can be seen in the above embodiments of the backlight module, and repeated descriptions are omitted.

The embodiment of the invention provides a backlight module and a display device, wherein a dimming area is divided into a compensation dimming area and a normal dimming area, and the luminance of the compensation dimming area is the same as that of the normal dimming area in a white light test stage, so that the luminance uniformity of each dimming area in the test stage can be ensured, and the luminance difference between an edge area and a middle area is reduced, thereby being beneficial to improving the display effect of a liquid crystal display screen in the actual display process.

It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.

Claims

1. The backlight module is characterized by comprising an LED substrate, wherein the LED substrate comprises a plurality of LED chips; the LED substrate comprises a plurality of dimming areas, and each dimming area comprises at least one LED chip;

in a white light testing stage, the light emitting brightness of the compensation dimming area is equal to that of the normal dimming area, and the number of the LED chips included in the compensation dimming area is smaller than that of the LED chips included in the normal dimming area;

wherein the LED substrate comprises at least one non-right-angled corner;

the LED chips comprise compensation LED chips and normal LED chips; the compensation LED chip is arranged on one side, close to the non-right-angle corner, of the normal LED chip, and the area of the compensation LED chip is smaller than that of the normal LED chip;

the compensation dimming area comprises at least one compensation LED chip, and the normal dimming area comprises a plurality of normal LED chips.

2. The backlight module of claim 1, wherein the compensated dimming region further comprises at least one of the normal LED chips.

3. The backlight module according to claim 1, wherein the compensation dimming region comprises a plurality of the normal LED chips;

for each light modulation area, at least two normal LED chips are connected in series to form a normal LED chip group, and the normal LED chip groups are connected in parallel.

4. The backlight module of claim 1, wherein for each of the compensated dimming zones:

each compensation LED chip is connected in series; or even number of the compensation LED chips are connected in series to form a compensation LED chip group, and the compensation LED chip groups are connected in parallel.

5. The backlight module as claimed in claim 2, wherein for each of the compensation dimming areas, the luminance of the compensation LED chip is equal to the luminance of the normal LED chip;

and aiming at each normal dimming area, the light emitting brightness of each normal LED chip is the same.

6. The backlight module according to claim 5, wherein for each of the compensation dimming regions, a driving current inputted to the compensation LED chip is larger than a driving current inputted to the normal LED chip;

and aiming at each normal dimming area, the driving current input to each normal LED chip is the same.

7. The backlight module as claimed in claim 1, wherein the areas of the LED chips are equal.

8. The backlight module as claimed in claim 1, wherein the distance between the LED chips is 0.5 mm to 4 mm.

9. The backlight module of claim 1, wherein the LED chips are blue LED chips.

10. The backlight module as claimed in claim 1, wherein during the white light testing stage, the driving current inputted to the LED chips in the compensation dimming area is greater than the driving current inputted to the LED chips in the normal dimming area.

11. The backlight module as claimed in claim 1, wherein the normal dimming area has a square shape in an orthographic projection on the LED substrate;

the orthographic projection shape of the compensation dimming area on the LED substrate is non-square.

12. A display device, comprising: a display panel and a backlight module according to any one of claims 1-11.