CN110187563B

CN110187563B - Backlight module, display module and display device

Info

Publication number: CN110187563B
Application number: CN201910569478.9A
Authority: CN
Inventors: 刘远明
Original assignee: Xiamen Tianma Microelectronics Co Ltd
Current assignee: Xiamen Tianma Microelectronics Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2022-02-18
Anticipated expiration: 2039-06-27
Also published as: CN110187563A

Abstract

The embodiment of the application provides a backlight module, a display module and a display device, wherein the backlight module comprises a light-emitting plate and a light-emitting plateA light-emitting plate on the light-emitting side of the light-emitting plate. The luminescent plate includes lamp plate and a plurality of light source, and a plurality of light sources are located the first surface of lamp plate. N distance sensors are arranged on the first surface and used for detecting the distance H between the lamp panel and the light diffusion plate at different positions₁，H₂，……，H_n，……，H_N. The second surface at the lamp plate is provided with M distance adjusting device for the interval of adjustment lamp plate and diffusion sheet. When H is present_nAnd H_mWhen the values are not equal, Hn is adjusted through the adjustment of the distance adjusting device. Wherein H_mThe target distance between the lamp panel and the light-diffusing plate. This application embodiment detects and adjusts lamp plate each department and the interval H of diffusion sheet through distance sensor and distance adjusting device_nSo that the backlight module can uniformly emit light.

Description

Backlight module, display module and display device

[ technical field ] A method for producing a semiconductor device

The application relates to the technical field of display, especially, relate to a backlight unit, display module assembly and display device.

[ background of the invention ]

The backlight module provides uniform white light for the display panel, so that the display panel can display images.

Specifically, a plurality of light sources are arranged on a lamp panel of the backlight module, and white light emitted by the light sources is changed into uniform white light after light mixing and light scattering, and is emitted from the light emitting side of the backlight module.

In order to make the white light emitted by each light source reach the light-diffusing plate with the same intensity, the distance between the lamp panel and the light-diffusing plate is required to be equal everywhere, but in the process of manufacturing and using the backlight module, the distance between the lamp panel and the light-diffusing plate is easy to be uneven. When the distance between the lamp panel and the light-diffusing plate in the backlight module is not uniform, the backlight module cannot uniformly emit light, so that the image displayed by the display panel is not uniform, and the display effect of the display panel is influenced.

For example, for curved display panels, a curved backlight module is required to provide uniform white light. In the assembly, the curved surface backlight module is generally formed by directly bending the mold, and because the curved surface backlight module has curvature and the lamp panel is a flat plate, when the curved surface backlight module is attached to an iron shell of the curved surface backlight module, the distance between the lamp panel and the light-diffusing plate may be different, so that the curved surface backlight module cannot uniformly emit light.

[ summary of the invention ]

In view of this, the embodiment of the present application provides a backlight module, a display module and a display device, where the backlight module includes a light-emitting panel and a light-diffusing panel located on a light-emitting side of the light panel, and the light-emitting panel includes the light panel and a plurality of light sources located on a first surface of the light panel. The first surface of lamp plate still is equipped with distance sensor, detects the interval of lamp plate and diffusion sheet in different positions. The second surface of lamp plate is equipped with apart from adjusting device, adjusts the interval of lamp plate and diffusion sheet. Through distance sensor and distance adjusting device, detect and adjust the interval of lamp plate each department and diffusion sheet for backlight unit can evenly give out light.

In one aspect, embodiments of the present application provide a backlight module, including,

a light emitting panel and a light diffusion panel located at a light emitting side of the light emitting panel;

the light emitting plate comprises a lamp plate and a plurality of light sources, and the plurality of light sources are positioned on a first surface of the lamp plate;

the first surface is provided with N distance sensors, and the distance sensors are used for detecting the distance H between the lamp panel and the light-diffusing plate at different positions₁，H₂，……，H_n，……，H_N(ii) a Wherein N and N are positive integers, and N is less than or equal to N;

the second surface of the lamp panel is provided with M distance adjusting devices for adjusting the distance between the lamp panel and the light-diffusing plate; wherein the second surface is a back surface of the first surface, and M is a positive integer;

when H is present_nAnd H_mWhen the distances are unequal, H is adjusted by adjusting the distance adjusting device_n(ii) a Wherein H_mIs the target distance between the lamp panel and the light-diffusing plate.

On the other hand, the embodiment of the application provides a display module assembly, the display module assembly includes above-mentioned backlight unit.

In another aspect, an embodiment of the present application provides a display device, which includes the above display module.

The embodiment of the application provides a backlight unit, display module and display device, backlight unit includes luminescent plate and sends outA light-diffusing plate on the light-emitting side of the plate. The luminescent plate comprises a lamp plate and a plurality of light sources, and light emitted by the light sources is scattered by the light-diffusing plate after reaching the light-diffusing plate and becomes uniform white light. N distance sensors are arranged on the same surface where the light source is arranged to detect the distance H between the lamp panel and the light-diffusing plate_n. M distance adjusting devices are arranged on the back of the surface where the light source is arranged to adjust the distance H between the lamp panel and the light-diffusing plate_n. The space between the light sources and the light scattering plate is equal, the light mixing distance corresponding to each light source is the same, and the backlight module can uniformly emit light.

[ description of the drawings ]

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

Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure;

FIG. 2 is a schematic cross-sectional view taken along the dotted line A-A' in FIG. 1;

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

FIG. 4 is a schematic cross-sectional view taken along the dashed line B-B' in FIG. 3;

FIG. 5 is a schematic view of the display panel shown in FIG. 3 along the Z-direction;

FIG. 6 is a schematic diagram illustrating a method for measuring a degree of bending according to an embodiment of the present disclosure;

FIG. 7 is another schematic cross-sectional view taken along dotted line A-A' of FIG. 1;

FIG. 8 is an enlarged view of the area M1 in FIG. 2;

FIG. 9 is another enlarged schematic view of the area M1 in FIG. 2;

FIG. 10 is a further enlarged schematic view of the area M1 of FIG. 2;

fig. 11 is a schematic structural diagram of a display module according to an embodiment of the present disclosure;

fig. 12 is a schematic structural diagram of a display device according to an embodiment of the present application.

[ detailed description ] embodiments

For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.

It should be understood that the embodiments described are only a few embodiments of the present application, 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 application.

The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.

In the description herein, it is to be understood that the terms "substantially", "approximately", "about", "substantially", and the like, as used in the claims and the examples herein, are intended to be generally accepted as not being precise, within the scope of reasonable process operation or tolerance.

It should be understood that although the terms first, second, third, etc. may be used to describe the display regions in the embodiments of the present application, the display regions should not be limited to these terms. These terms are only used to distinguish the display areas from each other. For example, the first display region may also be referred to as a second display region, and similarly, the second display region may also be referred to as a first display region without departing from the scope of the embodiments of the present application.

To clearly illustrate the importance of uniform illumination of the backlight module, the structure of the display module is described below.

The display module comprises a display panel and a backlight module, and the display panel is positioned on the light-emitting side of the backlight module.

The display panel comprises an array substrate and a color film substrate which are oppositely arranged, and the array substrate is arranged on one side close to the backlight module. And a liquid crystal layer is arranged between the array substrate and the color film substrate, and liquid crystal molecules are injected in the liquid crystal layer.

The array substrate is provided with thin film transistors distributed in an array manner, an electric field can be generated to drive liquid crystal molecules to turn, and the transmittance of the liquid crystal molecules with different turning directions to light rays is different.

The color film substrate is provided with a color resistance layer, the color resistance layer comprises color resistance units distributed in an array mode, and the color resistance units correspond to the thin film transistors.

Because the thin film transistors corresponding to different color resistance units drive the liquid crystal molecules to rotate differently, the light transmittance of the liquid crystal molecules in the areas corresponding to different color resistance units is different. The uniform white light emitted by the backlight module passes through the liquid crystal layer and is converted into white light with different intensities.

The color of different color resistance units in the color resistance layer is different, and the white light can be changed into the color light of the corresponding color resistance unit, so that the white light with different intensities can be changed into the color light of different intensities and different colors after passing through the color resistance layer, and a display image is formed.

Based on the above description, it can be known that the display panel emits light passively, the display effect of the display panel is affected by the backlight module, the white light emitted by the backlight module is not uniform, and the display image formed after the white light passes through the liquid crystal layer and the color resist layer is also not uniform, which affects the display effect of the display panel.

In order to clearly illustrate the principle of the backlight module forming uniform white light, the structure of the backlight module is described below.

Backlight unit includes the luminescent plate, and the luminescent plate includes the lamp plate and is located a plurality of light sources on the lamp plate, and the line of walking that distributes for the light source power supply on the lamp plate. The light source cannot directly emit uniform white light, so the backlight module further comprises a light-diffusing plate which is positioned at the light-emitting side of the light-emitting plate.

There is a space between the light-diffusing plate and the light-emitting plate, and the light source of the light-emitting plate emits white light which needs to pass through the space to reach the light-diffusing plate. During the passage through the gap, the white light from the different light sources is mixed.

The white light after mixing passes through the light diffusion plate to be diffused. The light scattering plate is provided with light scattering particles, and can scatter, refract and reflect light, so that the light becomes uniform. Thereby converting the white light emitted by the light sources on the lamp panel into uniform white light.

However, in the backlight module, the spacing between the light-diffusing plate and the light-emitting plate may be different during the manufacturing or using process, so that the white light emitted from the light source has different intensities after being mixed. The light emitted by the backlight module is not uniform, so that the image displayed by the display panel is not uniform, and the display effect of the display panel is influenced.

In order to solve the above problem, an embodiment of the present application provides a backlight module. Fig. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present disclosure. Fig. 2 is a schematic cross-sectional view along the dotted line a-a' in fig. 1. As shown in fig. 1 and 2, the backlight assembly includes a light emitting panel 110, and a light diffusion plate 210 positioned at a light emitting side of the light emitting panel. The light emitting panel 110 includes a lamp panel 111 and a plurality of light sources 112, and the light sources 112 are disposed on a first surface of the lamp panel 111. The first surface is a surface of the lamp panel 111 near one side of the light-diffusing plate 210.

The first surface is provided with N distance sensors 113, and the distance sensors 113 are used for detecting the distance H between the lamp panel 111 and the light-diffusing plate 210 at different positions₁，H₂，……，H_n，……，H_N. Wherein N and N are positive integers, and N is less than or equal to N.

The second surface of the lamp panel 111 is provided with M distance adjusting devices 114 for adjusting the distance between the lamp panel 111 and the light-diffusing plate 210. Wherein, the second surface is the back of the first surface, and M is a positive integer.

When H is present_nAnd H_mOut of phaseWhen the time is equal, H is adjusted by the adjustment of the distance adjusting device 114_n. Wherein H_mThe target distance between the lamp panel 111 and the light-diffusing plate 210.

In the backlight module of the present embodiment, the light-emitting plate 110 and the light-diffusing plate 210 are spaced apart from each other. Specifically, there is an interval between the lamp panel 111 and the light-diffusing plate 210, and the light emitted by the plurality of light sources 112 on the first surface of the lamp panel 111 is mixed in the process of passing through the interval. The light is mixed and then passes through the light-diffusing plate 210, and the light-diffusing particles in the light-diffusing plate 210 perform treatments such as scattering, refraction, reflection and the like on the light passing through the light-diffusing plate 210, so that the light passing through the light-diffusing plate 210 becomes uniform.

In order to make the light emitted by the different light sources 112 pass through the same interval and have the same light intensity during light mixing, N distance sensors 113 are disposed on the first surface of the lamp panel 111 to detect the distance between the lamp panel 111 and the light-diffusing plate 210 at different positions. Set up M distance adjusting device on the second surface of lamp plate 111, adjust the interval of lamp plate 111 and diffusion sheet 210 for lamp plate 111 and diffusion sheet 210 are at the interval H of different positions₁，H₂，……，H_n，……，H_NDistance H from target_mAnd the consistency is maintained. Therefore, the light emitted from different light sources 112 can pass through the same interval, the intensity of the light rays is the same when the light is mixed, and uniform white light can be formed after the light passes through the light-diffusing plate 210.

It should be noted that the target distance H between the lamp panel 111 and the light-diffusing plate 210_mThe value may be a preset fixed value, i.e. a design value corresponding to the backlight module. Or may be a formula

And (4) calculating and determining.

It can be understood that when the target distance H is_mBy the formula

When the calculation is determined, the distance H between the lamp panel 111 and the light-diffusing plate 210 is different in each backlight module₁，H₂，……，H_n，……，H_NDifferent, and therefore corresponding target spacing H_mAnd are also different.

At the above two target intervals H_mIn the determining method, the distance H between the lamp panel 111 and the light-diffusing plate 210 at different positions can be determined by using a preset fixed numerical value₁，H₂，……，H_n，……，H_NThe brightness of the display panel is kept consistent with the design value all the time, and the intensity of the uniform white light emitted by the backlight module is kept unchanged, so that the image displayed by the display panel is uniform, and the brightness is kept unchanged.

The formula is adopted to calculate and determine the distance H between the lamp panel 111 and the light-diffusing plate 210 at different positions₁，H₂，……，H_n，……，H_NAnd a target distance H_mThe difference in the values is small, and each distance adjusting device 114 can make the backlight module emit uniform white light only by performing small adjustment, so that the image displayed by the display panel is uniform.

In addition, the backlight module provided by the embodiment of the application can also be bent and used for providing uniform white light for the curved display panel.

Fig. 3 is another structural schematic diagram of a backlight module according to an embodiment of the present disclosure. Fig. 4 is a schematic cross-sectional view taken along the dashed line B-B' in fig. 3. As shown in fig. 3 and 4, the backlight assembly includes a light emitting panel 110, and a light diffusion plate 210 positioned at a light emitting side of the light emitting panel. The light emitting panel 110 includes a lamp panel 111 and a plurality of light sources 112, the light sources 112 are located on a first surface of the lamp panel 111, and the lamp panel 111 and the light diffusion panel 210 are respectively bent toward a light emitting side of the light emitting panel 110. The first surface is a surface of the lamp panel 111 near one side of the light-diffusing plate 210.

When H is present_nAnd H_mWhen they are not equal, H is adjusted by adjusting the distance adjusting device 114_n. Wherein H_mThe target distance between the lamp panel 111 and the light-diffusing plate 210.

Fig. 5 is a schematic structural diagram of the display panel in fig. 3 along the Z direction. As shown in fig. 5, when the backlight module is bent, the distribution positions of the plurality of light sources 112 form a first array, and the first array includes a first direction and a second direction. Wherein, first direction is lamp plate 111's crooked direction, and the second direction is crossing with first direction. The distribution positions of the M distance sensors 113 form a second array, which is arranged in a similar manner to the first array, and also includes the first direction and the second direction described above. The M distance sensors 113 are located at spaced areas of the plurality of light sources 112 in the first direction. That is, in the first direction, the distance sensor 113 is located at a spaced region between the light sources 112.

Because the backlight module is bent, in the first direction, the difference between the lamp panels 111 at different positions and the light-diffusing plate 210 is large. The distance sensor 113 is arranged in the interval area of the light source 112 in the first direction, so that the backlight module can detect the distance H between the lamp panel 111 and the light-diffusing plate 210 at different positions according to the distance sensor 113_nThe distance between the light source 112 and the light-diffusing plate 210 at different positions can be accurately obtained, and the error can be reduced.

It can be understood that the larger the bending degree of the backlight module is, the more difficult the lamp panel 111 and the light diffusion plate 210 are to keep the same distance at each position in the manufacturing and using processes, and the lamp panel 111 needs to be adjusted. Specifically, the inventor tests that when the backlight module satisfies the formula

In the meantime, the backlight module is easily bent locally in the first direction, resulting in uneven surface of the lamp panel 111. Where θ is an included angle between two adjacent light sources 112 in the first direction. X is the number of light sources 112 spaced between two adjacent distance sensors 113 in the first directionAnd (4) counting. r is a corresponding curvature of the light-diffusing plate 210.

The following is a detailed description of the formula

The backlight module provided by the embodiment of the present application ensures that the bending degree of the lamp panel 111 is consistent with that of the light-diffusing plate 210 by adjusting the distance between the lamp panel 111 and the light-diffusing plate 210 at different positions. Since the backlight module in the embodiment of the present application adjusts the lamp panel 111, the bending degree of the light diffusion plate 210 is actually used as a reference for the bending degree of the lamp panel 111, and the bending degree of the lamp panel 111 is adjusted to be the same as that of the light diffusion plate 210, so that the bending degree of the light diffusion plate 210 is used as the bending degree of the whole backlight module.

Fig. 6 is a schematic diagram illustrating a principle of a method for measuring a bending degree according to an embodiment of the present application. As shown in fig. 6, the curvature r of the light diffusion plate 210 is adopted as the curvature of the lamp panel 111 after adjustment, that is, the target curvature of the lamp panel 111. The curvature r is the rotation rate of the tangential angle to the arc length for a certain point on the curve, and the reciprocal of the curvature r is called the radius of curvature. In general, the curvature of a curve refers to the radius of a circle formed on the assumption that the curve is a part of a circle, the curvature 700R refers to the degree to which a circle having a radius of 0.7m is bent, and the curvature 1000R refers to the degree to which a circle having a radius of 1m is bent.

In the design process of the backlight module, in order to make the backlight module emit uniform white light, the curvatures of the lamp panel 111 and the light-diffusing plate 210 are designed to be the same. However, in actual manufacturing and use, the actual curvature of lamp panel 111 may be different from the pre-designed curvature, and it is necessary to adjust lamp panel 111 using distance sensor 113 and distance adjusting device 114. The distance between the lamp panel 111 and the light-diffusing plate 210 is the same, and the curvature of the lamp panel 111 is the same as that of the light-diffusing plate 210.

Specifically, to the less lamp plate 111 of the camber that designs in advance, the bending degree is great, and at the in-process of actual preparation and use, local bending appears in the first direction more easily, needs to carry out interval adjustment. And the lamp plate 111 that regional curvature is great, and the bending degree is less, is unlikely to appear local bending in the first direction, need not set up distance sensor 113 and distance adjusting device 114, carries out interval adjustment.

The method for measuring the bending degree provided by the embodiment of the application is used in the design process of the display panel, and whether the distance sensor 113 needs to be arranged on the lamp panel 111 or not and how the distance sensor 113 needs to be arranged in the actual manufacturing and using process are judged according to the preset bending degree of the lamp panel 111.

For convenience of description, the curvature r of the light-diffusing plate 210 is used as the curvature of the lamp panel 111 designed in advance to calculate the degree of curvature of the lamp panel 111, and further determine whether or not the distance sensors 113 need to be installed, and how to install the distance sensors 113, specifically, determine the number of the light sources 112 installed between two adjacent distance sensors 113.

As shown in fig. 6, in order to measure the bending degree of lamp panel 111, a right triangle is used to assist in calculating the bending degree of lamp panel 111. The center of a circle corresponding to the curvature of the lamp panel 111 is used as the vertex of the first acute angle of the right triangle, and the distance from the vertex to the lamp panel 111 is the radius of the circle corresponding to the curvature of the lamp panel 111.

In the first direction, the central angle corresponding to two adjacent light sources 112 on the lamp panel 111 is θ, the number of light sources 112 spaced between two adjacent distance sensors 113 is X, then the central angle corresponding to two adjacent distance sensors 113 is X θ, and the central angle X θ corresponding to two adjacent distance sensors 113 is taken as the first acute angle of the right triangle. Using the first distance sensor 113 as the right-angled vertex of the right-angled triangle, using the line connecting the distance sensor 113 with the center of the circle, and the tangent of the circle at the distance sensor 113 as the two legs of the right-angled triangle, the second distance sensor 113 is located on the hypotenuse of the right-angled triangle.

As can be appreciated from the formula of the trigonometric function,

the length of the diagonal sides of the right triangle in figure 6,

is the difference between the hypotenuse and the cathetus. When X θ is the same, the phase of the signal,

the larger the bending degree of lamp panel 111 is. For the lamp panel 111 with the curvature r, after the central angle θ corresponding to the two adjacent light sources 112 is determined, the larger X,

the larger. In order to determine the reasonable value of X, the value of X can be increased from 1, and the corresponding value is calculated continuously

The size of (2).

When in use

It is to be noted that the number of the light sources 112 between two adjacent distance sensors 113 may also be increased, that is, the value of X is increased, and the calculation is continued. When in use

It is shown that the number of light sources 112 between two adjacent distance sensors 113 reaches a reasonable value.

It should be noted that, for lamp panel 111, when X takes the maximum value, that is, X reaches the total number of light sources 112 in the first direction,

it means that the lamp panel 111 has a small possibility of bending in the first direction under the condition that the curvature is r, and the distance sensor 113 is not required.

For example, the light panel 111 has 20 light sources in the first direction, and in order to determine how to arrange the distance sensor 113 on the light panel 111, a hypothetical calculation is performed first. Assuming that X is equal to 4, i.e., the number of light sources 112 spaced between two adjacent distance sensors 113 is 4,

assuming that X is equal to 5, i.e., the number of light sources 112 spaced between two adjacent distance sensors 113 is 5,

then, it can be determined that the distance sensors 113 are disposed on the lamp panel 111, and the number of the light sources 112 spaced between two adjacent distance sensors 113 is 5.

Further, in the above example, assuming that X is equal to 20(20 is the total number of light sources 112 of lamp panel 111 in the first direction),

it is noted that the bending degree of lamp panel 111 is very small, and the possibility that lamp panel 111 is locally bent along the first direction is very small, and distance sensor 113 may not be provided.

Based on the foregoing pair formula

The following explains the range of the relevant parameters in the formula. The curvature R corresponding to the light-diffusing plate 210 generally satisfies that R is greater than or equal to 700R and less than or equal to 1000R, i.e., the preset curvature of the lamp panel 111 generally satisfies that R is greater than or equal to 700R and less than or equal to 1000R.

In addition, along the first direction, the distance between two adjacent light sources 112 is D, D is greater than 0mm and less than or equal to 30mm, and the included angle θ corresponding to two adjacent light sources 112 can be calculated according to the distance D and the curvature r. X light sources 112 are arranged between two adjacent distance sensors 113, and X is more than or equal to 4 and less than or equal to 10.

When the backlight module satisfies the above formula and parameter range, the distance sensor 113 can better detect the distance H between the lamp panel 111 and the light-diffusing plate 210 at different positions_nAdjusting the distance H between the lamp panel 111 and the light-diffusing plate 210 for the distance adjusting device 114_nA data reference is provided.

The foregoing descriptions of the flat backlight module and the curved backlight module are merely examples of the shape of the backlight module proposed in the embodiments of the present application, and are not intended to limit the shape of the backlight module. In fact, the inventive concept proposed in the embodiments of the present application can be used in backlight modules of any shape to adjust the distance between the lamp panel 111 and the light-diffusing plate 210, so that the backlight module can emit uniform white light.

In addition, in order to facilitate the distance adjusting device 114 to adjust the distance H between the lamp panel 111 and the light-diffusing plate 210 at different positions₁，H₂，……，H_n，……，H_NAdjustment is performed, and the embodiment of the present application provides a possible implementation manner, which can be used in all the embodiments described above. For convenience of description, the description is performed based on the backlight module in fig. 1, and the embodiments of the present application are not limited.

Fig. 7 is another schematic cross-sectional view along the dashed line a-a' in fig. 1, as shown in fig. 7. The number N of the distance sensors 113 is equal to the number M of the distance adjusting means, and each distance sensor 113 corresponds to the position of each distance adjusting means 114.

Thereby, the distance adjusting means 114 is made to directly depend on the value H detected by the corresponding distance sensor 113_nIs spaced apart from the target by a distance H_mTo the interval H between the lamp panel 111 and the light-diffusing plate 210_nAdjusting to make the adjusted backlight module satisfy H_nAnd H_mAre equal.

In order to realize the interval H between the lamp panel 111 and the light diffusion plate 210_nFor adjustment, the present embodiment provides several possible implementations of the distance adjustment device 114, which can be used in all the foregoing embodiments, and the following describes the distance adjustment device 114 provided in the present embodiment in detail.

Fig. 8 is an enlarged view of the region M1 in fig. 2. As shown in fig. 8, distance adjustment device 114 includes a pressure assembly 310 and a buffer pad 320, and buffer pad 320 is located between pressure assembly 310 and lamp panel 111. Specifically, the pressure assembly 310 includes a first moving portion 311, a connecting portion 312, and a first fixing portion 313, the first fixing portion 313 is fixed on the second surface of the lamp panel 111, and in the Z direction, the first fixing portion 313 at least partially covers the cushion pad 320. Wherein, the Z direction is the opposite direction of the emergent light direction of the backlight module.

The first moving portion 311 is located on a side of the first fixing portion 313 away from the cushion pad 320, the first fixing portion 313 has an opening, the connecting portion 312 passes through the opening, and a first end of the connecting portion 312 along the Z direction is connected to the first moving portion 311.

The first fixing portion 313 covers the cushion pad 320 to fix the cushion pad 320. Relative movement between first moving portion 311 and first fixed part 313 drives connecting portion 312 to move for connecting portion 312 extrudes blotter 320, and then extrudes the second surface of lamp plate 111, makes lamp plate 111 produce deformation, adjusts the interval H of lamp plate 111 and diffusion sheet 210 of the corresponding position of distance adjusting device 114_n。

It should be noted that the relative movement between the first moving portion 311 and the first fixed portion 313 may be automatically controlled, for example, by a control module receiving the value H detected by the distance sensor 113_nThen, after processing, a control signal is sent to control the relative movement between the first moving portion 311 and the first fixing portion 313, of course, the control module may be integrated in the distance adjusting device 114, or may not be integrated in the distance adjusting device 114, but be provided in other devices, such as a main chip of a display device; or manually, e.g. the user may detect the value H from the distance sensor 113_nManual adjustment is performed.

Further, fig. 9 is another enlarged schematic view of the region M1 in fig. 2. As shown in fig. 9, the hole of the first fixing portion 313 has an internal thread, the connecting portion 312 has an external thread, and the internal thread and the external thread are engaged with each other, so that the connecting portion 312 can rotate in the hole of the first fixing portion 313. The first moving portion 311 drives the connecting portion 312 to rotate, so that the second end of the connecting portion 312 presses the cushion pad 320 along the Z-direction. And then the second surface of lamp panel 111 is extruded for lamp panel 111 produces deformation, adjusts lamp panel 111 and the interval H of diffusion sheet 210 apart from the lamp panel 111 of adjusting device 114 corresponding position_n。

The elastic force generated by the lamp panel 111 due to the compression acts on the connecting portion 312 in the opposite direction of the Z direction, and the first moving portion 311 needs to rotate to move the connecting portion 312 in the Z direction by adopting a structure matched with the screw threads, so that the elastic force generated by the lamp panel 111 cannot move the connecting portion 312 in the opposite direction of the Z direction. In addition, the distance control that the structure that the screw thread agrees with moves along the Z direction to connecting portion 312 is comparatively accurate to it is accurate effective to the interval adjustment of lamp plate 111 and diffusion sheet 210.

In addition, the embodiment of the present application provides another structure of the pressure assembly 310, and fig. 10 is a further enlarged schematic view of the region M1 in fig. 2. As shown in fig. 10, the pressure assembly 310 includes a second movable portion 314 and a second fixing portion 315, and the second fixing portion 315 is fixed on the second surface of the lamp panel 111. The second moving part 314 has magnetism, and the second fixing part 315 can generate a magnetic field to drive the second moving part 314 to press the cushion pad 320 in the Z direction. Wherein, the Z direction is the opposite direction of the emergent light direction of the backlight module.

The magnetic field generated by the second fixed part 315 generates a magnetic force on the second movable part 314, and drives the second movable part 314 to press the cushion pad 320 in the Z direction. And then the second surface of lamp panel 111 is extruded for lamp panel 111 produces deformation, adjusts lamp panel 111 and the interval H of diffusion sheet 210 apart from the lamp panel 111 of adjusting device 114 corresponding position_n。

The embodiment of the present application further provides a display module, as shown in fig. 11, fig. 11 is a schematic structural diagram of the display module provided in the embodiment of the present application, and the display module includes the above backlight module. The specific structure of the backlight module has been described in detail in the above embodiments, and is not described herein again.

An embodiment of the present application further provides a display device, as shown in fig. 12, fig. 12 is a schematic structural diagram of the display device provided in the embodiment of the present application, and the display device includes the display module. Of course, the display device shown in fig. 12 is only a schematic illustration, and the display device may be any electronic device with a display function, such as a mobile phone, a tablet computer, a notebook computer, an electronic book, or a television.

Because display module assembly and display device that this application embodiment provided include above-mentioned backlight unit, consequently, adopt this display module assembly and display device, backlight unit includes the diffusion sheet of the light-emitting side of luminescent plate and luminescent plate. The luminous plate comprises a lamp plate and a plurality of luminous platesAnd the light emitted by the light source reaches the light-diffusing plate and is scattered by the light-diffusing plate to become uniform white light. N distance sensors are arranged on the same surface where the light source is arranged to detect the distance H between the lamp panel and the light-diffusing plate_n. M distance adjusting devices are arranged on the back of the surface where the light source is arranged to adjust the distance H between the lamp panel and the light-diffusing plate_n. The space between the light sources and the light scattering plate is equal, the light mixing distance corresponding to each light source is the same, and the backlight module can uniformly emit light.

The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A backlight module, comprising:

the light emitting plate comprises a lamp plate and a plurality of light sources, and the plurality of light sources are positioned on a first surface of the lamp plate; the first surface is the surface of one side of the lamp panel close to the light-diffusing plate;

2. The backlight module of claim 1,

target interval H between lamp plate and diffusion plate_mIs given by the formula

And (4) calculating and determining.

3. The backlight module of claim 1,

the distance adjusting device comprises a pressure assembly and a buffer cushion, and the buffer cushion is located between the pressure assembly and the lamp panel.

4. The backlight module of claim 3,

the pressure assembly comprises a first moving part, a connecting part and a first fixing part;

the first fixing part is fixed on the second surface of the lamp panel, and at least partially covers the cushion pad in the Z direction; the Z direction is the opposite direction of the emergent light direction of the backlight module;

the first moving part is positioned on one side of the first fixing part, which is far away from the buffer pad;

the first fixed part is provided with an opening, the connecting part penetrates through the opening, and the first end of the connecting part along the Z direction is connected with the first moving part.

5. The backlight module of claim 4,

the opening is provided with internal threads;

the connecting part is provided with an external thread;

the first moving portion drives the connecting portion to rotate, so that the second end of the connecting portion extrudes the cushion pad along the Z direction.

6. The backlight module of claim 3,

the pressure assembly comprises a second moving part and a second fixing part;

the second fixing part is fixed on a second surface of the lamp panel;

the second moving part has magnetism;

the second fixed part can generate a magnetic field to drive the second movable part to press the buffer pad along the Z direction;

and the Z direction is the opposite direction of the emergent light direction of the backlight module.

7. The backlight module of claim 1,

the lamp panel with the diffusion plate is respectively to the luminous side of luminescent plate carries out the bending.

8. The backlight module of claim 7,

the distribution positions of the plurality of light sources form a first array, and the first array comprises a first direction and a second direction; wherein the first direction is a bending direction of the lamp panel, and the second direction intersects the first direction;

the distribution positions of the M distance sensors form a second array; the second array comprises the first direction and the second direction;

the M distance sensors are located at spaced areas of the plurality of light sources in the first direction.

9. The backlight module of claim 8,

the backlight module satisfies the formula

The theta is an included angle corresponding to two adjacent light sources in the first direction;

x is the number of the light sources spaced between two adjacent distance sensors in the first direction;

r is the corresponding curvature of the light diffusion plate.

10. The backlight module of claim 9,

the curvature R corresponding to the light-diffusing plate meets the condition that R is more than or equal to 700R and less than or equal to 1000R;

along the first direction, the distance between two adjacent light sources is D, wherein D is more than 0mm and less than or equal to 30 mm;

along the first direction, X light sources are arranged between two adjacent distance sensors, wherein X is more than or equal to 4 and less than or equal to 10.

11. The backlight module of claim 1,

the number N of the distance sensors is equal to the number M of the distance adjusting devices, and each distance sensor corresponds to the position of each distance adjusting device.

12. A display module comprising the backlight module of any one of claims 1-11.

13. A display device comprising the display module of claim 12.