CN109116631B

CN109116631B - Backlight module, liquid crystal display module and electronic equipment

Info

Publication number: CN109116631B
Application number: CN201811161131.2A
Authority: CN
Inventors: 凌安恺; 沈柏平
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2018-09-30
Filing date: 2018-09-30
Publication date: 2021-06-15
Anticipated expiration: 2038-09-30
Also published as: CN109116631A

Abstract

The invention discloses a backlight module, a liquid crystal display module and electronic equipment.A retaining wall structure is arranged between two adjacent local dimming areas, wherein each retaining wall comprises a first retaining wall extending along a first direction and a second retaining wall extending along a second direction, the height of each first retaining wall is different from that of each second retaining wall, and/or the width of each first retaining wall is different from that of each second retaining wall, and the first direction is vertical to the second direction. Therefore, the first retaining wall and the second retaining wall can be set to have set heights according to the light emitting brightness of the LED light-emitting element in different directions, and/or the first retaining wall and the second retaining wall can be set to have set widths so as to overcome the light mixing problem of the boundaries of two adjacent local dimming areas and further improve the image display quality. The liquid crystal display module and the electronic equipment comprise the backlight module, so that the problem of light mixing at the boundaries of different local dimming areas is solved, and the image display quality is improved.

Description

Backlight module, liquid crystal display module and electronic equipment

Technical Field

The invention relates to the technical field of electronics, in particular to a backlight module, a liquid crystal display module and electronic equipment.

Background

With the continuous development of scientific technology, more and more electronic devices with display functions are widely applied to daily life and work of people, bring great convenience to the daily life and work of people, and become an indispensable important tool for people at present. The main component of the electronic device that implements the display function is the display panel. Currently, one display panel commonly used in electronic devices is a liquid crystal display panel. The liquid crystal display module does not emit light, and the backlight provided by the backlight module is needed to be used for image display.

High-Dynamic Range (HDR) images have higher color depth, wider Dynamic Range and stronger color expressive force, and the liquid crystal display panel in the HDR display mode has performance such as High contrast/highlight and the like remarkably superior to that of a conventional liquid crystal display panel, even can be compared with an OLED display panel, and becomes an important research and development direction in the liquid crystal display panel industry.

Currently, the lcd panel in HDR display mode generally employs a direct-type backlight module, which includes an LED array having a plurality of LED light emitting elements. The LED array is divided into a plurality of local dimming areas, and each local dimming area can be used for respectively controlling light emission according to an image to be displayed. Due to the fact that the distance between the LED light-emitting elements is small, the light mixing problem exists at the boundaries of different local dimming areas, and the image display quality is affected.

Disclosure of Invention

In order to solve the above problems, the technical solution of the present invention provides a backlight module, a liquid crystal display module and an electronic device, which solve the problem of light mixing at the boundary of different local dimming areas and improve the image display quality.

In order to achieve the above purpose, the invention provides the following technical scheme:

a backlight module, comprising:

a substrate;

the LED light-emitting elements are arranged in an array, and are arranged on the first surface of the substrate and electrically connected with the substrate;

the backlight module is divided into a plurality of local dimming areas, each local dimming area comprises at least one LED light-emitting element, and a retaining wall is arranged between every two adjacent local dimming areas;

the barricade includes the first barricade that extends along the first direction and the second barricade that extends along the second direction, the height of first barricade with the height of second barricade is different, and/or, the width of first barricade with the width of second barricade is different, wherein, first direction perpendicular to the second direction.

Preferably, in the backlight module, the LED light emitting element includes a light emitting top surface and a light emitting side surface; the light-emitting top surface deviates from the substrate;

the light emitting side surface of the same LED light emitting element comprises two opposite first light emitting side surfaces and two opposite second light emitting side surfaces, the light emitting brightness of the first light emitting side surfaces is greater than that of the second light emitting side surfaces, the extending direction of the first light emitting side surfaces is parallel to the first direction, and the extending direction of the second light emitting side surfaces is parallel to the second direction;

the height of the second retaining wall is smaller than that of the first retaining wall, and/or the width of the second retaining wall is smaller than that of the first retaining wall.

Preferably, in the backlight module, the height of the first retaining wall is set to be Hb, the height of the second retaining wall is set to be Ha, and Ha is more than 0 and less than or equal to 0.3 mm;

and/or setting the width of the first retaining wall as Wb, setting the width of the second retaining wall as Wa, wherein Wa is more than 0 and Wb is less than or equal to 1.5 mm.

Preferably, in the backlight module, the first retaining wall includes a plurality of first sub-retaining walls and at least one second sub-retaining wall, the first sub-retaining walls and the second sub-retaining walls are alternately arranged in the first direction, two adjacent first sub-retaining walls are connected by a second sub-retaining wall, and each first sub-retaining wall is opposite to one LED light-emitting element in the second direction;

the height of the first sub-retaining wall is set to be H1, and the height of the second sub-retaining wall is set to be H2, H2 is more than 0 and less than H1.

Preferably, in the backlight module, the second retaining wall includes a plurality of third sub-retaining walls and at least one fourth sub-retaining wall, the third sub-retaining walls and the fourth sub-retaining walls are alternately arranged in the second direction, two adjacent third sub-retaining walls are connected by a fourth sub-retaining wall, and each third sub-retaining wall is respectively disposed opposite to one LED light-emitting element in the first direction;

the height of the third sub-retaining wall is set to be H3, and the height of the fourth sub-retaining wall is set to be H4, H4 is more than 0 and less than H3.

Preferably, in the backlight module, in the first direction, the height of the first retaining wall is not changed;

and in the second direction, the height of the second retaining wall is unchanged.

Preferably, in the backlight module, the height of the first retaining wall and the height of the second retaining wall are not less than the height of the LED light emitting element.

Preferably, in the backlight module, a height difference between the first retaining wall and the LED light emitting element and a height difference between the second retaining wall and the LED light emitting element are not less than 0.2 mm.

Preferably, in the backlight module, the sidewalls of the first retaining wall are light-absorbing surfaces or reflecting surfaces, and the sidewalls of the second retaining wall are light-absorbing surfaces or reflecting surfaces.

Preferably, in the backlight module, the first retaining wall is made of an organic material or a metal, and the second retaining wall is made of an organic material or a metal.

Preferably, in the backlight module, the first direction is parallel to the row direction of the array, the second direction is parallel to the column direction of the array, the first retaining wall between two adjacent rows of LED light emitting elements is an integral structure, and the second retaining wall between two adjacent columns of LED light emitting elements is an integral structure;

or, the first direction is parallel to the row direction of the array, the second direction is parallel to the row direction of the array, the first retaining wall is in an integral structure between two adjacent rows of LED light-emitting elements, and the second retaining wall is in an integral structure between two adjacent rows of LED light-emitting elements.

The invention also provides a liquid crystal display module, which comprises:

the liquid crystal display panel and the backlight module are oppositely arranged;

the backlight module is the backlight module described in any one of the above.

The invention also provides electronic equipment which comprises the liquid crystal display module.

As can be seen from the above description, in the backlight module provided in the embodiments of the present invention, the retaining wall structure is disposed between two adjacent local dimming regions, the retaining wall includes a first retaining wall extending along a first direction and a second retaining wall extending along a second direction, a height of the first retaining wall is different from a height of the second retaining wall, and/or a width of the first retaining wall is different from a width of the second retaining wall, where the first direction is perpendicular to the second direction. Therefore, the first retaining wall and the second retaining wall can be set to have set heights according to the light emitting brightness of the LED light-emitting element in different directions, and/or the first retaining wall and the second retaining wall can be set to have set widths so as to overcome the light mixing problem of the boundaries of two adjacent local dimming areas and further improve the image display quality. The liquid crystal display module and the electronic equipment comprise the backlight module, so that the problem of light mixing at the boundaries of different local dimming areas is solved, and the image display quality is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a top view of a layout of LED light-emitting elements of a direct-type backlight module;

FIG. 2 is a sectional view taken along line P-P' of FIG. 1;

fig. 3 is a layout top view of LED light emitting elements in a backlight module according to an embodiment of the present invention;

FIG. 4 is a cut-away view A-A' of FIG. 3;

fig. 5 is a top view of an LED lighting element 22 according to an embodiment of the present invention;

fig. 6 is a luminance graph of an LED light-emitting device at different azimuth angles according to an embodiment of the present invention;

FIG. 7 is a top view of another layout of LED light-emitting elements in a backlight module according to an embodiment of the present invention;

fig. 8 is a backlight brightness sampling diagram according to an embodiment of the present invention;

fig. 9 is a graph illustrating a luminance distribution at two boundaries of a local dimming region according to an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a first retaining wall according to an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a second barrier according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a backlight module according to an embodiment of the invention;

fig. 13 is a schematic structural diagram of another backlight module according to an embodiment of the invention;

fig. 14 is a schematic structural diagram of a liquid crystal display module according to an embodiment of the invention;

fig. 15 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived 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.

Referring to fig. 1 and 2, fig. 1 is a top view of a layout of LED light emitting elements of a direct type backlight module, and fig. 2 is a cross-sectional view of fig. 1 in a direction P-P', the backlight module includes a substrate 11 and a plurality of LED light emitting elements 12 disposed on a first surface of the substrate 11. The LED light emitting elements 12 are electrically connected to the substrate 11 and connected to the driving chip through the interconnection circuit on the substrate 11. A plurality of LED light emitting elements 12 are arranged in an array. The LED light emitting element 12 is provided with a fluorescent film 13, a diffusion film 14 and a brightness enhancement film 15 in this order on the side away from the first surface of the substrate 11.

The backlight module is divided into a plurality of local dimming areas 10, and each local dimming area 10 comprises at least one LED light-emitting element 12. As shown in fig. 2, for the adjacent

local dimming regions

101 and 102, the light in the boundary region 16 has a light mixing problem, which may affect the display quality of the image. The reasons for the light mixing problem of different local dimming regions 10 include not only that the top surface of the LED lighting element 12 emits light with a certain divergence angle, but also that the side surface of the LED lighting element 12 can emit light.

In order to solve the above problems, embodiments of the present invention provide a backlight module, and a liquid crystal display module and an electronic device including the backlight module. Backlight unit sets up the barricade structure between two adjacent local dimming areas, the barricade includes the first barricade that extends along the first direction and the second barricade that extends along the second direction, the height of first barricade with the height difference of second barricade, and/or, the width of first barricade with the width difference of second barricade, wherein, first direction perpendicular to the second direction. Therefore, the first retaining wall and the second retaining wall can be set to have set heights according to the light emitting brightness of the LED light-emitting element in different directions, and/or the first retaining wall and the second retaining wall can be set to have set widths so as to overcome the light mixing problem of the boundaries of two adjacent local dimming areas and further improve the image display quality.

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.

Referring to fig. 3 and 4, fig. 3 is a top view of a layout of LED light emitting elements in a backlight module according to an embodiment of the present invention, and fig. 4 is a sectional view of fig. 3 taken along line a-a', the backlight module is used for a liquid crystal display module, and the backlight module includes: a substrate 21; the LED light-emitting device comprises a plurality of LED light-emitting elements 22, wherein the LED light-emitting elements 22 are arranged in an array, and the LED light-emitting elements 22 are arranged on the first surface of the substrate 21 and electrically connected with the substrate 21.

The backlight module is divided into a plurality of local dimming regions 20, each local dimming region 20 comprises at least one LED light-emitting element 22, and a retaining wall 31 is arranged between every two adjacent local dimming regions 20. The retaining wall 31 includes a first retaining wall 311 extending along a first direction and a second retaining wall 312 extending along a second direction, a height Hb of the first retaining wall 311 is different from a height Ha of the second retaining wall 312, and/or a width Wb of the first retaining wall 311 is different from a width Wa of the second retaining wall 312, that is, the following three embodiments are included: in the first mode, Hb ≠ Ha; in the second mode, Wb ≠ Wa; in the third mode, Hb ≠ Ha, and Wb ≠ Wa. Wherein the first direction is perpendicular to the second direction.

For the sake of clarity, the drawings of the present application are based on the same three-dimensional rectangular coordinate system XYZ, and the first surface of the substrate 21 is parallel to the XY plane. The first direction may be parallel to the X-axis and the second direction parallel to the Y-axis.

By arranging the first retaining wall 311 and the second retaining wall 312, the problem of light mixing between any two adjacent local dimming regions 20 can be avoided, so that the image display quality is improved. Thus, the height relationship between the first retaining wall 311 and the second retaining wall 312 and/or the width relationship between the first retaining wall 311 and the second retaining wall 312 can be set according to the light emitting brightness of the LED light emitting element 22 in different directions, so that the first retaining wall 311 and the second retaining wall 312 can solve the light mixing problem at the boundary of two adjacent local dimming regions 20 by the matched height and/or width.

In the embodiment of the present invention, the backlight module is a direct type backlight module, the plurality of LED light emitting elements 22 are located on the same surface of the same substrate 21, and the surface light source is used as a backlight. The LED light emitting element 22 may be a Mini LED, which is an LED having a size of 100 μm or more. From the aspect of manufacturing process, the Mini LED has High yield and a special-shaped cutting characteristic compared with the Micro LED, can be matched with a flexible substrate and a High-curved backlight mode or a rigid inflexible substrate, adopts a local dimming design to divide a plurality of local dimming regions 20, has better color rendering, can bring more precise HDR (High-Dynamic Range, High Dynamic Range image) partition to a liquid crystal panel, has a thickness approaching that of an OLED panel, is convenient for light and thin design, and has a power saving function. In other embodiments, the LED lighting element 22 may be a Micro LED. Micro LEDs are LED scaling and matrixing technologies, which simply means that an LED backlight is thinned, miniaturized, and arrayed, and LED units smaller than 100 μm can be used to address each pixel independently and drive light emission (self-luminescence) independently as in an OLED.

Referring to fig. 5 and fig. 6, fig. 5 is a top view of an LED lighting element 22 according to an embodiment of the present invention, and fig. 6 is a luminance graph of the LED lighting element according to an embodiment of the present invention at different azimuth angles.

The LED light emitting element 22 is exemplified by a Mini LED. The LED lighting element 22 has a cubic structure with six surfaces. The LED light emitting element 22 is flip-chip mounted on the surface of the substrate 21. Which emits light away from the first surface of the substrate 21, the current process does not allow all light to exit from this surface, but some light exits from its side. In the cubic structure corresponding to the LED light-emitting element 22, a surface of the cubic structure opposite to the first surface of the substrate 21 is a bottom surface, the surface has two electrodes for flip-chip fixing with a circuit on the substrate 21, a surface opposite to the bottom surface is a light-emitting top surface, the other four surfaces are light-emitting side surfaces, two of the four light-emitting side surfaces are first light-emitting side surfaces 222, and the other two are second light-emitting side surfaces 223. Generally, the light-emitting top surface of the LED light-emitting element 22 is rectangular, so the sizes of the four light-emitting sides are different, the sizes of the two light-emitting sides corresponding to the long sides of the rectangle are larger, and the sizes of the two light-emitting sides corresponding to the short sides of the rectangle are smaller, so that the light-emitting brightness of the first light-emitting side 222 is larger than that of the second light-emitting side 223. In the embodiment of the present invention, the first light-emitting side surface 222 is a side surface corresponding to a long side of the rectangle, and the second light-emitting side surface 223 is a side surface corresponding to a short side of the rectangle.

In fig. 5, four directions on the XY plane are shown, the azimuth angles of the four directions are sequentially 0 ° (toward the negative X-axis), 90 ° (toward the negative Y-axis), 180 ° (toward the positive X-axis), and 270 ° (toward the positive Y-axis), the azimuth angle of one first light-exiting side face 222 is 270 °, the azimuth angle of the other first light-exiting side face 222 is 90 °, the azimuth angle of one second light-exiting side face 223 is 0 °, and the azimuth angle of the other second light-exiting side face 223 is 180 °.

In fig. 6, the vertical axis represents brightness, the horizontal axis represents azimuth angle, and represents azimuth angle with respect to the Z axis, the curve of 0 ° -180 ° represents brightness distribution of the second light-exiting side 223 at different azimuth angles of-90 ° to 90 ° from the Z axis, and the curve of 90 ° -270 ° represents brightness distribution of the first light-exiting side 222 at different azimuth angles of-90 ° to 90 ° from the Z axis. As shown in fig. 6, the light-emitting brightness of the direction corresponding to the first light-emitting side surface 222 and the light-emitting brightness of the direction corresponding to the second light-emitting side surface 223 are compared, except for the two curve trough positions, the light-emitting brightness of the direction corresponding to the first light-emitting side surface 222 is greater than that of the direction corresponding to the second light-emitting side surface 223, and overall, the light-emitting brightness of all directions corresponding to the first light-emitting side surface 222 is greater than that of all directions corresponding to the second light-emitting side surface 223.

Based on the above description, the LED light emitting element 22 includes a light emitting top surface 221 and light emitting side surfaces (222, 223); the light-emitting top surface 221 faces away from the first surface of the substrate 21; it is same LED light emitting element 22, the light-emitting side includes two relative first light-emitting sides 222 and two relative second light-emitting sides 223, the light-emitting luminance of first light-emitting sides 222 is greater than the light-emitting luminance of second light-emitting sides 223, the extending direction of first light-emitting sides 222 is on a parallel with the first direction, the extending direction of second light-emitting sides is on a parallel with the second direction.

Thus, the height of the second retaining wall 312 is set to be smaller than that of the first retaining wall 311, the first retaining wall 311 with the larger height blocks stronger light, the second retaining wall 312 with the lower height blocks weaker light, and both the first retaining wall 311 and the second retaining wall 312 can adopt the height adaptive to the brightness of the blocked light, so that the heights of the first retaining wall and the second retaining wall are moderate, and the increase of the thickness of the backlight module caused by the overlarge height is avoided; and/or, the width of second barricade 312 is less than the width of first barricade 311, shelters from stronger light through the great first barricade 311 of thickness, shelters from less strong light through the second barricade 312 that has less thickness, and first barricade 311 and second barricade 312 all can adopt the thickness that the adaptation is in sheltering from light luminance for the two thickness is moderate, avoids the too big increase that leads to LED light-emitting component 22 interval to lead to the luminance reduction in a poor light that leads to.

As shown in fig. 6, the brightness of the LED light emitting device 22 in the 90 ° -270 ° direction is higher than the brightness in the 0 ° -180 ° direction, so that the optimal way is to use the third way, where the height of the first retaining wall 311 is greater than the height of the second retaining wall 312, and the width of the first retaining wall 311 is greater than the width of the second retaining wall 312, so as to effectively improve the light mixing problem between two adjacent local light adjusting regions 20.

In the embodiment of the present invention, the height of the first retaining wall 311 is set as Hb, the height of the second retaining wall 312 is Ha, Ha is greater than 0 and less than or equal to 0.3 mm; and/or setting the width of the first retaining wall as Wb, setting the width of the second retaining wall as Wa, wherein Wa is more than 0 and Wb is less than or equal to 1.5 mm. In this case, the three embodiments are further defined as follows: in the first mode, Ha is more than 0 and less than or equal to Hb and less than or equal to 0.3 mm; in the second mode, Wa is more than 0 and Wb is less than or equal to 1.5 mm; in the third mode, Hb is more than 0 and less than or equal to 0.3mm, and Wa is more than 0 and more than or equal to Wb and less than or equal to 1.5 mm.

In the embodiment of the present invention, the first retaining wall 311 may be disposed in the first direction, and the height of the first retaining wall is not changed; in the second direction, the height of the second blocking wall 312 is not changed.

The local dimming area 20 may have only one LED lighting element 22 or a plurality of LED lighting elements 22, as shown in fig. 7, fig. 7 is a layout top view of LED lighting elements in another backlight module according to an embodiment of the present invention, and in the manner shown in fig. 7, each local dimming area 20 includes only one LED lighting element 22. When a plurality of LED light emitting elements 22 are provided, the number and arrangement of the LED light emitting elements 22 are not limited to the 2 × 2 manner illustrated in the embodiment of the present invention. When there are a plurality of LED lighting elements 22, the local dimming region 20 has m rows × n columns, m and n are positive integers, and at least one is greater than 1. The first retaining walls 311 between two rows of the same LED light emitting elements 22 are an integral structure, and the second retaining walls 312 between two columns of the same LED light emitting elements 22 are an integral structure.

Referring to fig. 8 and 9, fig. 8 is a backlight brightness sampling diagram according to an embodiment of the present invention, and fig. 9 is a graph illustrating a distribution of brightness at two boundaries of a local dimming region according to an embodiment of the present invention.

Fig. 8 shows a luminance of a local dimming region 20, a boundary of the local dimming region 20 parallel to the first direction is provided with a first wall 311, and the LED light emitting element corresponding to the first wall 311 in the second direction includes: two adjacent LED light emitting elements in the first direction respectively correspond to the position 4 and the position 6, the distance between the two LED light emitting elements corresponds to the position 5, a boundary parallel to the second direction is provided with a second blocking wall 312, and the LED light emitting elements corresponding to the second blocking wall 312 in the first direction include: two LED light emitting elements adjacent in the second direction correspond to the position 1 and the position 3, respectively, and the pitch of the two LED light emitting elements corresponds to the position 2.

As can be seen from fig. 9, the luminance at different positions differs, and for the above-described boundary parallel to the first direction, the luminance at position 4 is 1.3% higher than the luminance at position 5, and the luminance at position 6 is 1.6% higher than the luminance at position 5; for the above-described boundary parallel to the second direction, the luminance at position 1 is 2.3% higher than the luminance at position 2, and the luminance at position 3 is 2.2% higher than the luminance at position 2. As can be seen, in the same local dimming region 20, the brightness of the boundary parallel to the first direction and the brightness of the boundary parallel to the second direction are different at different positions, so that the heights of the first retaining wall 311 and the second retaining wall 312 at different positions may be different, and the specific implementation manner may be as shown in fig. 10 and 11.

Referring to fig. 10, fig. 10 is a schematic structural view of a first retaining wall according to an embodiment of the present invention, where the first retaining wall 311 includes: a plurality of first sub-retaining walls 41 and at least one second sub-retaining wall 42, wherein the first sub-retaining walls 41 and the second sub-retaining walls 42 are alternately arranged in the first direction, two adjacent first sub-retaining walls 41 are connected by a second sub-retaining wall 42, and each first sub-retaining wall 41 is respectively arranged opposite to one LED light-emitting element 22 in the second direction; the height of the first sub-retaining wall is set to be H1, and the height of the second sub-retaining wall is set to be H2, H2 is more than 0 and less than H1.

For the first retaining wall 311, among the adjacent LED light emitting elements arranged continuously in the first direction, the light emitted from the LED light emitting element 22 is concentrated on the opposite first sub-retaining wall 41, so the light brightness of the second sub-retaining wall 42 between the two first sub-retaining walls 41 is smaller, and therefore the first retaining wall 311 can be set to have a smaller height at the second sub-retaining wall 42 corresponding to the gap between the two adjacent LED light emitting elements 22, so as to reduce the amount of retaining wall material used.

As shown in fig. 10, the top surface of the first retaining wall 311 is a wavy curved surface, and in other embodiments, the top surface may be a sawtooth curved surface, such as a triangular sawtooth area, or a rectangular sawtooth curved surface.

Referring to fig. 11, fig. 11 is a schematic structural diagram of a second barrier according to an embodiment of the present invention, in which the second barrier 312 includes: a plurality of third sub-retaining walls 43 and at least one fourth sub-retaining wall 44, wherein the third sub-retaining walls 43 and the fourth sub-retaining walls 44 are alternately arranged in the second direction, two adjacent third sub-retaining walls 43 are connected by a fourth sub-retaining wall 44, and each third sub-retaining wall 43 is respectively arranged opposite to one LED light-emitting element 22 in the first direction; the height of the third sub-retaining wall is set to be H3, and the height of the fourth sub-retaining wall is set to be H4, H4 is more than 0 and less than H3. Since Ha < Hb, 0 < H4 < H3 < H2 < H1.

For the second retaining wall 312, among the adjacent LED light emitting elements arranged continuously in the second direction, the light emitted from the LED light emitting element 22 is concentrated on the opposite third sub-retaining wall 43, so the light brightness of the fourth sub-retaining wall 44 between the two third sub-retaining walls 43 is smaller, and therefore the second retaining wall 312 may be set to have a smaller height at the fourth sub-retaining wall 44 corresponding to the gap between the two adjacent LED light emitting elements 22, so as to reduce the amount of retaining wall material used.

Similarly, as shown in fig. 11, the top surface of the second blocking wall 312 is a wavy curved surface, and in other ways, the second blocking wall may also be a sawtooth curved surface, such as a triangular sawtooth area, or a rectangular sawtooth curved surface.

In the backlight module according to the embodiment of the present invention, the height Hb of the first retaining wall 311 and the height Ha of the second retaining wall 312 are not less than the height of the LED light emitting element 22. Therefore, each retaining wall can not only shield the light emitted from the light-emitting side face of the LED light-emitting element, but also shield the light obliquely emitted from the light-emitting top face at a large angle, namely, the light with a larger angle with the Z axis, so that the light mixing problem of different local light-adjusting regions 20 is avoided.

The height difference between the first retaining wall 311 and the LED light-emitting element 22 and the height difference between the second retaining wall 312 and the LED light-emitting element are not less than 0.2 mm. The height of the LED light emitting element 22 is set to H0, Hb-H0 is 0.2mm or more, Ha-H0 is 0.2mm or more, and when the height of the first retaining wall 311 is changed in the first direction, Hb is the height of the lowest position thereof. When the height of the second wall 312 varies in the second direction, Ha is the height of the lowest position.

In the embodiment of the invention, the light shielding function of the retaining wall comprises reflecting incident light or absorbing the incident light. Light of one local dimming region 20 is prevented from being incident on another adjacent local dimming region 20. Therefore, the sidewalls of the first retaining wall 311 may be light absorbing surfaces or reflecting surfaces, and the sidewalls of the second retaining wall 312 may be light absorbing surfaces or reflecting surfaces.

The material of the first retaining wall 311 is an organic material or a metal, and the material of the second retaining wall 312 is an organic material or a metal, and any material capable of achieving the light shielding effect may be used, including but not limited to the materials described in the embodiments of the present invention, and preferably, the first retaining wall 311 and the second retaining wall 312 may be made of the same material, so that the first retaining wall 311 and the second retaining wall 312 may be made of the same material.

In the embodiment of the present invention, the LED light emitting element may be a white LED, in order to improve the light emitting uniformity and brightness of the backlight module, the backlight module may be further shown in fig. 12, fig. 12 is a schematic structural view of the backlight module according to the embodiment of the present invention, and on the basis of the above embodiment, the mode shown in fig. 12 further includes a diffusion film 24 and a brightness enhancement film 25. The diffuser film 24 serves to improve the uniformity of the emitted light. The brightness enhancement film 25 is used for adjusting the emergent angle of the light rays, so that the light rays are converged towards the normal direction of the brightness enhancement film 14, and the axial brightness is improved under the condition of not increasing the total emergent luminous flux.

In the embodiment of the present invention, the LED light emitting element may also be a blue LED, at this time, the backlight module is shown in fig. 13, fig. 13 is a schematic structural diagram of another backlight module provided in the embodiment of the present invention, on the basis of the embodiment shown in fig. 12, the manner shown in fig. 13 further includes a fluorescent film disposed between the diffusion film 24 and the LED light emitting element 22, and the LED light emitting element 22 emits blue light to excite the fluorescent powder in the fluorescent film, so that the LED light emitting element emits white light. The fluorescent powder comprises red fluorescent powder and green fluorescent powder.

When a blue LED is used, the brightness enhancement film 25 includes two layers of prism sheets disposed opposite to each other. In other modes, the fluorescent film can be replaced by an adhesive layer with fluorescent powder, and the adhesive layer can be located between the brightness enhancement film 25 and the diffusion film 24 for bonding and fixing the brightness enhancement film 25 and the diffusion film 24, or located between two prism sheets of the brightness enhancement film 25 for bonding and fixing the two prism sheets of the brightness enhancement film 25 without separately arranging the fluorescent film.

In the embodiment of the present invention, the first direction is parallel to the row direction of the array, the second direction is parallel to the column direction of the array, the first retaining wall 311 between two adjacent rows of LED light emitting elements 22 is an integral structure, and the second retaining wall 312 between two adjacent columns of LED light emitting elements 22 is an integral structure. In other modes, the first direction may be parallel to the row direction of the array, the second direction may be parallel to the row direction of the array, the first retaining wall between two adjacent rows of LED light emitting elements is integrated, and the second retaining wall between two adjacent rows of LED light emitting elements is integrated.

In the backlight module according to the embodiment of the present invention, each local dimming area 20 can be controlled to be lit up, and the lighting state of the LED lighting element 22 in each local dimming area 20 can be controlled independently based on the image to be displayed, so that the backlight brightness in different areas is adapted to the brightness information of the image to be displayed, and a better image display effect is achieved.

As can be seen from the above description, the backlight module according to the embodiment of the invention can avoid the problem of light mixing between two adjacent local light modulation regions 20 by the first retaining wall 311 and the second retaining wall 312, so as to improve the image display quality.

Based on the above backlight module, another embodiment of the present invention further provides a liquid crystal display module, where the liquid crystal display module is shown in fig. 14, and fig. 14 is a schematic structural diagram of the liquid crystal display module provided in the embodiment of the present invention, and the liquid crystal display module includes: a liquid crystal display panel 52 and a backlight module 51 arranged oppositely; the backlight module 51 is the backlight module described in the above embodiments.

The liquid crystal display module adopts the backlight module of the embodiment, so that the problem of light mixing between adjacent local dimming areas is avoided, and the image display quality is improved.

Based on the above backlight module embodiment and the liquid crystal display embodiment, another embodiment of the present invention further provides an electronic device, where the electronic device is shown in fig. 15, fig. 15 is a schematic structural diagram of the electronic device provided in the embodiment of the present invention, the electronic device includes a liquid crystal display module 61, and the liquid crystal display module 61 is the liquid crystal display module in the above embodiment.

The electronic equipment provided by the embodiment of the invention can be mobile phones, tablet computers, notebook computers, televisions, wearable equipment and other electronic equipment with a display function. By adopting the liquid crystal display module in the embodiment, the electronic equipment avoids the light mixing problem between adjacent local dimming areas, and improves the image display quality.

It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in an article or device that comprises the element.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A backlight module is characterized in that the backlight module comprises:

a substrate;

2. The backlight module according to claim 1, wherein the LED light emitting elements comprise a light exit top surface and a light exit side surface, the light exit top surface faces away from the substrate;

3. The backlight module as claimed in claim 2, wherein the height of the first wall is Hb, the height of the second wall is Ha, Ha < Hb is 0-3 mm;

4. The backlight module according to claim 2, wherein the first retaining walls comprise a plurality of first sub-retaining walls and at least one second sub-retaining wall, the first sub-retaining walls and the second sub-retaining walls are alternately arranged in the first direction, two adjacent first sub-retaining walls are connected by a second sub-retaining wall, and each first sub-retaining wall is opposite to one of the LED light-emitting elements in the second direction;

5. The backlight module according to claim 2, wherein the second retaining wall comprises a plurality of third retaining walls and at least one fourth retaining wall, the third retaining walls and the fourth retaining walls are alternately arranged in the second direction, two adjacent third retaining walls are connected by a fourth retaining wall, and each third retaining wall is opposite to one LED light-emitting element in the first direction;

6. The backlight module as claimed in claim 1, wherein the height of the first wall is constant in the first direction;

7. The backlight module as claimed in claim 1, wherein the height of the first wall and the height of the second wall are not less than the height of the LED light emitting element.

8. The backlight module as claimed in claim 7, wherein the height difference between the first wall and the LED and the height difference between the second wall and the LED are not less than 0.2 mm.

9. The backlight module as claimed in claim 1, wherein the sidewalls of the first dam are light-absorbing surfaces or reflecting surfaces, and the sidewalls of the second dam are light-absorbing surfaces or reflecting surfaces.

10. The backlight module as claimed in claim 1, wherein the first dam is made of organic material or metal, and the second dam is made of organic material or metal.

11. The backlight module according to any one of claims 1-10, wherein the first direction is parallel to the row direction of the array, the second direction is parallel to the column direction of the array, the first walls between two adjacent rows of the LED light emitting elements are integrally formed, and the second walls between two adjacent columns of the LED light emitting elements are integrally formed;

12. The utility model provides a liquid crystal display module assembly which characterized in that, liquid crystal display module assembly includes:

the backlight module as claimed in any one of claims 1-11.

13. An electronic device, characterized in that the electronic device comprises the liquid crystal display module according to claim 12.