Backlight module and display device

Abstract

The invention provides a backlight module and a display device comprising the same. The backlight module comprises a substrate; an optical layer on the substrate; and a plurality of support portions between the substrate and the optical layer. The optical layer comprises a contact area making contact with the multiple supporting parts and a non-contact area not making contact with the multiple supporting parts, the first distance between the contact area and the substrate is larger than the second distance between the non-contact area and the substrate, and the distance S between any two adjacent supporting parts in the multiple supporting parts meets the following condition: # imgabs0 #, the modulus # imgabs2 # of the vector is equal to the maximum value of the difference between the first distance and the second distance, and K is a positive number.

Description

Technical Field

[0001] The present disclosure relates to the field of display technology, and in particular to a backlight module and a display device including the backlight module. Background Art

[0002] Liquid crystal display devices are widely used in the display field due to their advantages of being light, thin, shock-resistant, wide viewing angle, and high contrast. Liquid crystal display devices generally include a display panel and a backlight source, and the display panel is generally arranged on the light-emitting side of the backlight source to receive the light provided by the backlight source. The contrast, brightness uniformity, and stability of liquid crystal display devices are related to the structure and performance of the backlight source. In recent years, sub-millimeter light-emitting diodes (Mini-LEDs) have received widespread attention due to their excellent performance and have been applied to backlight sources. Summary of the invention

[0003] According to one aspect of the present disclosure, a backlight module is provided, comprising: a substrate; an optical layer located on the substrate; and a plurality of support portions located between the substrate and the optical layer. The optical layer comprises a contact area in contact with the plurality of support portions and a non-contact area not in contact with the plurality of support portions, a first distance between the contact area and the substrate is greater than a second distance between the non-contact area and the substrate, and a spacing S between any two adjacent support portions among the plurality of support portions satisfies the following conditions: in, is a vector whose magnitude is equal to the maximum value of the difference between the first distance and the second distance, and K is a positive number.

[0004] In some embodiments, Wherein, the optical layer includes a stacked first optical layer and a second optical layer, ρ1 is the density of the first optical layer, ρ2 is the density of the second optical layer, h1 is the thickness of the first optical layer, h2 is the thickness of the second optical layer, α is the unit length of the optical layer in a first direction, the first direction is parallel to the x-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, E is the Young's modulus of the second optical layer, and g is the gravitational acceleration.

[0005] In some embodiments, The optical layer includes a stacked first optical layer and a second optical layer, ρ1 is the density of the first optical layer, ρ2 is the density of the second optical layer, h1 is the thickness of the first optical layer, h2 is the thickness of the second optical layer, α is the unit length of the optical layer in a first direction, the first direction is parallel to the x-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, E is the Young's modulus of the second optical layer, g is the gravitational acceleration, b is the width of the optical layer along the second direction, the second direction is parallel to the y-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, I y is the moment of inertia of the cross section of the optical layer relative to the y-axis, the cross section of the optical layer is perpendicular to the plane where the substrate is located, L is the theoretical spacing between any two adjacent support parts among the multiple support parts, and x is any value between 0 and L.

[0006] In some embodiments,

[0007] In some embodiments, the first optical layer includes a quantum dot film and a composite film, and the second optical layer includes a diffuser plate.

[0008] In some embodiments, S≤245.5 mm.

[0009] In some embodiments, The range is 0~0.35mm.

[0010] In some embodiments, the spacing S between any two adjacent support portions among the plurality of support portions satisfies:

[0011] In some embodiments, each of the plurality of support portions has an effective support range, and the effective support ranges of at least two adjacent support portions of the plurality of support portions partially overlap with each other.

[0012] In some embodiments, the plurality of support portions are arranged in an array on the substrate.

[0013] In some embodiments, the backlight module further includes a plastic frame, and the plastic frame is arranged between the substrate and the optical layer and along four edges of the optical layer.

[0014] In some embodiments, the substrate includes a plurality of light emitting elements arranged in an array, and the backlight module is a direct-type backlight module.

[0015] In some embodiments, the size of the backlight module is 34 inches, and the backlight module includes 12 support parts, and the 12 support parts are arranged in 3 rows×4 columns.

[0016] In some embodiments, the size of the backlight module is 34 inches, and the backlight module includes 21 support parts, and the 21 support parts are arranged in 3 rows×7 columns.

[0017] According to another aspect of the present disclosure, a backlight module is provided, comprising: a substrate; an optical layer located on the substrate; and a plurality of support portions located between the substrate and the optical layer. The spacing S between any two adjacent support portions among the plurality of support portions satisfies the following conditions: in, is a vector whose magnitude It is equal to the maximum allowable sinking amount of the optical layer in the direction perpendicular to the substrate, and K is a positive number.

[0018] According to another aspect of the present disclosure, a display device is provided, comprising: the backlight module described in any of the above embodiments; and a display panel located at a light emitting side of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, in which:

[0020] Figure 1 A schematic diagram showing a partial structure of a backlight module according to an embodiment of the present disclosure;

[0021] Figure 2 A simplified schematic diagram showing the structure and force conditions of a support portion and an optical layer according to an embodiment of the present disclosure;

[0022] Figure 3 A schematic structural diagram of an optical layer according to an embodiment of the present disclosure is shown;

[0023] Figure 4 A schematic cross-sectional view of an optical layer according to an embodiment of the present disclosure is shown;

[0024] Figure 5 A method of arranging multiple support parts on a substrate according to an embodiment of the present disclosure is shown;

[0025] Figure 6 Another arrangement of multiple support portions on a substrate according to an embodiment of the present disclosure is shown; and

[0026] Figure 7 A schematic structural diagram of a display device according to an embodiment of the present disclosure is shown.

[0027] It should be understood that the accompanying drawings are only schematic illustrations of exemplary embodiments of the present disclosure, rather than limitations of the present disclosure, and need not be drawn strictly to scale. In addition, in the accompanying drawings, the same or similar reference numerals are used to refer to the same or similar components. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present disclosure will be described clearly and completely below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] Direct-type backlight modules are increasingly being used in display modules including passive display panels due to their advantages of simple process, more uniform brightness, and higher light efficiency. Direct-type backlight modules usually include a stacked optical layer and a substrate. A plurality of light-emitting elements are arranged on the side of the substrate close to the optical layer. A certain light mixing distance (Optical Distance, OD) needs to be maintained between the substrate and the optical layer. The light emitted by the light-emitting elements can be fully mixed before entering the optical layer, thereby providing a surface light source with more uniform brightness everywhere.

[0030] In recent years, the industry has tried to reduce production costs by reducing the number of light-emitting elements on the substrate. However, the reduction in the number of light-emitting elements will lead to an increase in the lamp shadow phenomenon. The lamp shadow problem can be effectively solved by increasing the light mixing distance. However, after the light mixing distance increases, that is, the distance between the optical layer and the substrate becomes larger, during the production and transportation process, the backlight module is usually in a flat state. If the light mixing distance between the optical layer and the substrate is only achieved through structures such as a rubber frame in the four sides of the optical layer, the optical layer will be deformed due to gravity, and as the size and / or weight of the optical layer increases, the deformation of the optical layer will become more serious. In this way, when the backlight module works in a vertical state, it will seriously affect the optical quality of the outgoing light of the backlight module. In order to avoid the deformation of the optical layer due to gravity, a support structure can be introduced into the backlight module to provide support for the optical layer in the flat state that will inevitably appear during the production and transportation process. However, the inventors of the present application discovered that, in the related art, the number and arrangement design of the supporting structures in the backlight module completely depend on the experience of the operator. For the same backlight module, the number and / or arrangement of the supporting structures designed by different operators may vary greatly, which makes the design of the supporting structure lack a scientific theoretical basis and cannot achieve the optimal arrangement.

[0031] In view of this, some embodiments of the present disclosure provide a backlight module, in which the actual spacing between two adjacent support parts in the backlight module depends on the theoretical spacing obtained by fitting the actual theoretical calculation method. The actual spacing of the support parts is arranged according to the theoretical spacing, which can make the arrangement of the support parts more scientific.

[0032] Figure 1 FIG. 1 is a schematic diagram showing a partial structure of the backlight module 100. Figure 1 As shown, the backlight module 100 includes: a substrate 101; an optical layer 102 located on the substrate 101; and a plurality of support portions 103 located between the substrate 101 and the optical layer 102. For simplicity, Figure 1 Only a single support portion 103 is shown. The optical layer 102 includes a contact region C in contact with the support portion 103 and a non-contact region not in contact with the support portion 103. Figure 1 As an example, two non-contact areas NC1 and NC2 are marked, but in fact, as understood by those skilled in the art, the optical layer 102 may include countless non-contact areas. The distance between the contact area C and the substrate 101 is the first distance, and the distance between the non-contact area and the substrate 101 is the second distance, and the first distance is greater than the second distance. In other words, the optical layer 102 is not completely flat relative to the substrate 101. This is because, with the support portion 103 as the center point, the farther away from the support portion 103, the greater the moment of force generated by the self-weight of the optical layer 102, and the greater the amount of sinking of the optical layer 102 in the direction perpendicular to the substrate 101. Compared with the contact area C of the optical layer 102 that contacts the support portion 103, the non-contact area of ​​the optical layer 102 that does not contact the support portion 103 collapses toward the direction close to the substrate 101, so that the optical layer 102 presents a shape similar to an "umbrella".

[0033] The actual spacing S between any two adjacent support portions 103 among the plurality of support portions 103 satisfies: Among them, K is a positive number, is a vector whose magnitude is equal to the maximum value of the difference between the first distance and the second distance, or in other words, the modulus It refers to the maximum allowable sinking amount of the optical layer 102 in the direction perpendicular to the substrate 101. For example, Figure 1 As shown, the distance between the contact area C and the substrate 101 is the first distance D1, the distance between the non-contact area NC1 and the substrate 101 is the second distance D2, and the distance between the non-contact area NC2 and the substrate 101 is the second distance D3. The non-contact area NC2 is the position corresponding to the maximum sinking amount of the optical layer 102. Therefore, the minimum value of the second distance is the second distance D3 between the non-contact area NC2 and the substrate 101. Therefore, the maximum value of the difference between the first distance and the second distance is Equal to the difference between the first distance D1 and the second distance D3.

[0034] The embodiment of the present disclosure provides a theoretical calculation method for the distance between two adjacent support portions 103. As long as the actual spacing S between two adjacent support portions 103 meets this condition, the optical layer 102 can be prevented from being excessively deformed, so that the deformation of the optical layer 102 is within the allowable range of optical requirements, thereby improving the optical quality of the output light of the backlight module 100 .

[0035] The theoretical basis for designing the actual spacing S between two adjacent support portions 103 will be described in more detail below.

[0036] Figure 1 It can be regarded as a schematic diagram of the support range of a single support portion 103. Figure 1 As shown, assuming that the optical layer 102 is placed on a single support portion 103, with the support portion 103 as the center point, the farther away from the support portion 103, the greater the torque generated by the self-weight of the optical layer 102, and the greater the amount of sinking of the optical layer 102 in the direction perpendicular to the substrate 101, so that the optical layer 102 presents an "umbrella-like" shape. From an optical point of view, in order to ensure the uniformity of the image of the display device including the backlight module 100, the amount of sinking of the optical layer 102 in the direction perpendicular to the substrate 101 must be kept within a certain range. Assuming that the maximum allowable sinking of the optical layer 102 in the direction perpendicular to the substrate 101 is The maximum sinking As the boundary, the support range of a single support portion 103 can form a circle with a diameter of L. In order to calculate the support range of a single support portion 103, two adjacent support portions 103 can be regarded as spherical support points. The support portion 103 only provides support to the optical layer 102 in a direction perpendicular to the substrate 101, and does not affect the movement of the optical layer 102 in a direction parallel to the substrate 101. The portion of the optical layer 102 located between two adjacent support portions 103 is regarded as a beam, and the gravity G of this portion of the optical layer 102 is regarded as a uniformly distributed load. The support portion 103 provides a support force F to the optical layer 102. The simplified structure and force conditions of the support portion 103 and the optical layer 102 of the backlight module 100 are as follows: Figure 2 shown.

[0037] Depend on Figure 2 From the simplified structure, we can see that the structure satisfies the deflection curve equation:

[0038]

[0039] In formula (1), M represents the moment, and x is any value between 0 and L.

[0040] From formula (1), we can get the following formula (2):

[0041]

[0042] The derivation process from formula (1) to formula (2) is as follows:

[0043]

[0044] in,

[0045] Q=(ρ1h1·ba+ρ2h2·ba)·g

[0046] For both sides and points,

[0047] get

[0048] Integrate both sides again,

[0049] get

[0050] when

[0051] hour, Will Substituting into formula (I), we get

[0052] When x=0, Set x = 0 and Substituting into formula (II), we get D = 0,

[0053] Will D=0, Q=(ρ1h1·ba+ρ2h2·ba)·g are substituted into formula (II),

[0054] get

[0055] Therefore

[0056]

[0057] is a vector, the positive direction is the direction from the substrate 101 to the optical layer 102, and the negative sign after the equal sign in formula (2) indicates The direction is from the optical layer 102 to the substrate 101. The optical layer 102 includes a first optical layer and a second optical layer stacked. In formula (2), ρ1 is the density of the first optical layer, in units of g / mm 3 ; ρ2 is the density of the second optical layer, in g / mm 3 ; h1 is the thickness of the first optical layer, in mm; h2 is the thickness of the second optical layer, in mm; E is the Young's modulus of the second optical layer, in (g·m / s 2 ) / mm 2; g is the acceleration due to gravity, in m / s 2 ; L is the theoretical spacing between two adjacent support portions 103, in mm; x is any value between 0 and L, in mm; α is the unit length of the beam (i.e., the optical layer 102) in the simplified structure in the first direction, in mm, the first direction is parallel to the x-axis in the coordinate system and perpendicular to the z-axis (i.e., the thickness direction of the optical layer 102), such as Figure 4 b is the width of the beam (ie, the optical layer 102) in the simplified structure along the second direction, in mm, the second direction is parallel to the y-axis in the coordinate system and perpendicular to the z-axis, as shown in FIG. Figure 4 As shown; I y To simplify the structure, the moment of inertia of the cross section of the beam (ie, the optical layer 102) along the AA' line relative to the y-axis is expressed in mm. 4 , the cross section of the optical layer 102 is perpendicular to the plane where the substrate 101 is located, such as Figure 4 shown.

[0058] like Figure 3 As shown, in some embodiments, the optical layer 102 includes a stacked first optical layer 1021 and a second optical layer 1022, and the second optical layer 1022 is closer to the substrate 101 than the first optical layer 1021. In some embodiments, the second optical layer 1022 is a diffuser. In such an embodiment, ρ2 in formula (2) refers to the density of the diffuser, and h2 refers to the thickness of the diffuser. The material of the diffuser includes, but is not limited to, polyethylene terephthalate (PET). In some embodiments, the first optical layer 1021 may include one or more film layers. For example, the first optical layer 1021 may include a stacked composite film 1023 and a quantum dot film 1024. In such an embodiment, ρ1 in formula (2) refers to the density of the composite film 1023 and the quantum dot film 1024, and h1 refers to the superimposed thickness of the composite film 1023 and the quantum dot film 1024. The materials of the composite film 1023 and the quantum dot film 1024 include, but are not limited to, polystyrene (PS). It is understandable that the composite film 1023 can achieve any function such as converging light at a specific angle (positive viewing angle), modifying various optical coupling phenomena, reducing or avoiding Newton rings, reducing or avoiding interference fringes, reducing or avoiding black and white spots, and improving light emission rate.

[0059] As mentioned above, I y It refers to the moment of inertia of the cross section of the beam (ie, the optical layer 102) in the simplified structure along the AA' line relative to the y-axis, such as Figure 4 As shown, in some embodiments, the shape of the cross section may be rectangular. y It represents the bending strength of the optical layer 102. y It can be expressed as:

[0060]

[0061] Since the film layers of the optical layer 102 are usually stacked along the z-axis direction, there is usually no connection force between the film layers. When the diffuser 1022 is bent, the other film layers located on the side of the diffuser 1022 away from the substrate 101 will produce relative displacement and bend accordingly, without increasing the bending strength of the diffuser 1022. Therefore, in the above simplified model, it is mainly the diffuser 1022 that provides the bending strength. Therefore, the cross-sectional moment of inertia of the diffuser 1022 can be used as the cross-sectional moment of inertia of the entire optical layer 102. Therefore, formula (3) can be expressed as:

[0062]

[0063] In some embodiments, the thickness h2 of the diffuser 1022 is 2.5 mm. Substituting h2=2.5 mm into equation (4), we can get: y =1.302b.

[0064] The size of b This is because, as can be seen from equation (4), when the thickness h2 of the diffuser 1022 remains unchanged, the larger b is, the larger I y The larger the value is, the larger the denominator in formula (2) is. However, the larger the value is, the larger the cross-sectional area of ​​the optical layer 102 along the AA' line is, and accordingly, the larger the weight G of the optical layer 102 is, G = (ρ1h1+ρ2h2)·b·α·g, and thus, the larger the numerator in formula (2) is. The increased numerator and denominator cancel each other out, so that The size remains unchanged. For example, assuming that an optical layer A and an optical layer B are provided, the width of the optical layer A along the second direction is b, and the width of the optical layer B along the second direction is b+Δb; the weight of the optical layer A is G, G=(ρ1h1+ρ2h2)·b·α·g; the weight of the optical layer B is G+ΔG, G+ΔG=(ρ1h1+ρ2h2)·(b+Δb)·α·g. The maximum sinking amount of the optical layer A is recorded as The maximum sinking amount of the optical layer B is recorded as According to formula (2) and formula (4), we can get:

[0065]

[0066]

[0067] from and It can be seen from the expression that and It is independent of b, so the change in the value of b has no effect on The value of has no effect.

[0068] In formula (2), when x is equal to L / 2, Model Reach the maximum value. Set x = L / 2, Substituting into formula (2), we can get:

[0069]

[0070] It can be known from formula (5) that the theoretical spacing L between two adjacent support portions 103 satisfies the following equation:

[0071]

[0072] The theoretical spacing L is the maximum allowable spacing between two adjacent support portions 103. Therefore, in the backlight module 100, as long as the actual spacing S between two adjacent support portions 103 is less than or equal to the theoretical spacing L, the maximum sinking amount of the optical layer 102 is It is within the allowable range, so that the flatness of the optical layer 102 can be ensured to be within the allowable range, the optical quality of the outgoing light of the backlight module 100 is improved, and the picture uniformity of the display device including the backlight module 100 is further improved.

[0073] According to formula (6), Right now

[0074] The inventor of the present application has verified the 34-inch backlight module. The inventor found that for the 34-inch backlight module, when the maximum sinking amount of the optical layer 102 is When the screen uniformity of the display device is within the range of 0 to 0.35 mm, it is greater than 80%, meeting the design requirements. Substituting mm into formula (6), the theoretical spacing L between two adjacent support parts 103 of a 34-inch backlight module can be obtained as follows:

[0075]

[0076] In an exemplary embodiment, the material of the composite film 1023 and the quantum dot film 1024 is polystyrene, and the value of its density ρ1 is 1.05 g / cm 3 The material of the diffuser 1022 is polyethylene terephthalate, and its density ρ2 is 1.39 g / cm 3 The stacking thickness h1 of the composite film 1023 and the quantum dot film 1024 is 0.72 mm; the thickness h2 of the diffuser plate 1022 is 3 mm; the value of α is 1 mm; E is the Young's modulus of the diffuser plate 1022, which is 2900 MPa; g is the gravitational acceleration, which is 9.8 m / s 2It can be understood that, in some embodiments, the composite film 1023 is a composite film material integrating multiple functions; in some embodiments, the composite film 1023 may include a plurality of sub-layers stacked in sequence, for example, it may include at least two of a diffusion sheet, a prism sheet, a brightness enhancement film, and a brightness enhancement sheet, and the substrate material used for each sub-layer is the same, that is, it has the same density ρ1; the thickness of the composite film 1023 is the sum of the thicknesses of the plurality of sub-layers.

[0077] Substituting the values ​​of the above parameters into formula (7), it can be concluded that for a 34-inch backlight module, the theoretical spacing L between any two adjacent support portions 103 among the plurality of support portions 103 is equal to 245.5 mm. Therefore, when actually designing a 34-inch backlight module, as long as the actual spacing S between two adjacent support portions 103 is less than or equal to 245.5 mm, the maximum sinking amount of the optical layer 102 will be less than or equal to 0.35 mm, and the screen uniformity of the display device is greater than 80%, meeting the design requirements.

[0078] In the embodiment of the present disclosure, a support range theory of a single support portion 103 is proposed, a calculation method of the theoretical spacing L between two adjacent support portions 103 is derived, and the actual spacing S between two adjacent support portions 103 is designed based on the theoretical spacing L. In this way, the design of the support portion 103 can be based on a scientific theoretical basis, and the number of support portions 103 in the backlight module 100 can be designed more reasonably to achieve the optimal arrangement. By making the actual spacing S between two adjacent support portions 103 less than or equal to the theoretical spacing L, the deformation of the optical layer 102 can be within the allowable range of optical requirements, thereby improving the optical quality of the outgoing light of the backlight module 100 and ensuring the uniformity of the picture of the display device. On the other hand, by arranging multiple support portions 103 based on the theoretical spacing L, since the support portion 103 can ensure the flatness of the optical layer 102, the light mixing distance can be appropriately increased to overcome the lamp shadow problem, thereby helping to reduce the number of light-emitting elements on the substrate 101, and thus helping to reduce production costs.

[0079] According to the theoretical spacing L between two adjacent support portions 103, multiple support portions 103 can be arranged on the substrate 101. The arrangement of multiple support portions 103 should meet two conditions: (1) the number of support portions 103 should be as small as possible; (2) the effective support range of multiple support portions 103 can cover the entire optical layer 102.

[0080] Figure 5A method of arranging a plurality of support portions 103 on a substrate 101 is shown. In this arrangement, the actual spacing S between two adjacent support portions 103 among the plurality of support portions 103 is equal to the theoretical spacing L. For example, when the substrate 101 is a 34-inch substrate, the actual spacing S between two adjacent support portions 103 among the plurality of support portions 103 may be equal to 245.5 mm. A total of 12 support portions 103 are arranged on the substrate 101, and the 12 support portions 103 are arranged in an array on the substrate 101. The regular array arrangement is conducive to making the effective support range of the plurality of support portions 103 better cover the entire optical layer 102. In some embodiments, the 12 support portions are arranged in 3 rows × 4 columns on the substrate 101. According to the calculation method of the theoretical spacing between two adjacent support parts 103 provided in the embodiment of the present disclosure, a 34-inch backlight module only needs 12 support parts 103 to ensure that the entire optical layer 102 is within the supporting range of the support parts 103, thereby ensuring the flatness of the optical layer 102 and preventing the optical layer 102 from excessively collapsing, thereby ensuring the optical quality of the output light of the backlight module and improving the picture uniformity of the display device.

[0081] refer to Figure 5 Each support portion 103 has an effective support range ( Figure 5 The effective support ranges of at least two adjacent support portions 103 among the 12 support portions 103 partially overlap with each other. Figure 5 As shown, in the horizontal direction, the effective support ranges of two adjacent support parts 103 only partially overlap; in the vertical direction, the effective support ranges of three adjacent support parts 103 only partially overlap each other. In order to ensure that the entire optical layer 102 can be supported by the support parts 103, the effective support ranges of adjacent support parts 103 need to overlap. However, in order to ensure that the number of support parts 103 used is as small as possible, the overlapping range of the effective support ranges of adjacent support parts 103 cannot be too large, and cannot be completely overlapped, but only partially overlap. In this way, the number of support parts 103 can be minimized while ensuring the flatness of the optical layer 102. Reducing the number of support parts 103 is conducive to more clearly observing the arrangement and layout of the support parts 103 and the state of the optical layer 102, and is conducive to subsequent inspection and analysis of adverse phenomena. In some embodiments, the effective support range of each support part 103 is circular.

[0082] Figure 6Another arrangement of multiple support parts 103 on the substrate 101 is shown. In this arrangement, the actual spacing S between two adjacent support parts 103 in the multiple support parts 103 is less than the theoretical spacing L. In theory, although the actual spacing S between two adjacent support parts 103 can ensure the flatness of the optical layer 102 as long as it is equal to the theoretical spacing L, as known to those skilled in the art, during the preparation stage of the backlight module, the backlight module needs to be tested in aspects such as vibration test and packaging material drop test to ensure the product reliability of the backlight module. Since there is a certain gap between the various film layers of the backlight module, during the vibration test and / or packaging material drop test, each film layer will vibrate in the z-axis direction, and the gravity and impact force of each film layer will be transmitted to the substrate 101 through the support part 103, and a plurality of light-emitting elements are arranged on the substrate 101. If the number of the support parts 103 is too small, the force transmitted to the substrate 101 by a single support part 103 will be very large, and the substrate 101 is at risk of breaking. Therefore, appropriately increasing the number of support parts 103 is conducive to safely passing the vibration test and / or the packaging material drop test and preventing the substrate 101 from breaking. Therefore, when actually arranging the support parts 103 of the backlight module, at least the following two factors need to be considered: (1) The actual spacing S between two adjacent support parts 103 cannot be greater than the theoretical spacing L; (2) On the basis of satisfying that the actual spacing S between two adjacent support parts 103 is not greater than the theoretical spacing L, in order to ensure that the vibration test and / or the packaging material drop test is safely passed, the actual spacing S between two adjacent support parts 103 is appropriately reduced to appropriately increase the number of support parts 103.

[0083] In some embodiments, the actual spacing S between two adjacent support portions 103 is equal to half of the theoretical spacing L, that is, For example, when Figure 6 When the substrate 101 is a 34-inch substrate, the actual spacing S between two adjacent support parts 103 among the multiple support parts 103 can be equal to 122.75 mm. 21 support parts 103 can be arranged on the substrate 101, and the 21 support parts 103 are arranged in an array on the substrate 101, for example, they can be arranged in 3 rows × 7 columns. The effective support range of the 21 support parts 103 can completely cover the area of ​​the optical layer 102, ensuring the flatness of the optical layer 102. It has been verified that this arrangement can safely pass the single body vibration test and the packaging material drop test.

[0084] Figure 6 The arrangement of the support parts 103 shown is conducive to optimizing the arrangement of the support parts 103 , which can not only ensure the flatness of the optical layer 102 , but also ensure that the backlight module safely passes the single body vibration test and the packaging material drop test, thereby ensuring the reliability of the product.

[0085] In addition, the arrangement of the support parts 103 is usually limited by the device used to attach the support parts 103, in addition to the theoretical spacing L between two adjacent support parts 103. The device used to attach the support parts 103 usually attaches the support parts 103 along the long side direction of the backlight module, so the multiple support parts 103 are usually arranged in a rectangular shape.

[0086] For a backlight module with a light mixing distance, in order to avoid the weight of the optical layer 102 being entirely pressed on the support portion 103, resulting in excessive force being transmitted to the substrate 101, and causing the risk of cracking the edge of the substrate 101, in some embodiments, a rubber frame is also provided between the substrate 101 and the optical layer 102, and the rubber frame is provided along the four edges of the optical layer 102. In this way, the rubber frame can support the optical layer 102 from the edge, and the support portion 103 originally provided at the edge of the substrate 101 can move toward the inside of the substrate 101, thereby avoiding cracking of the edge of the substrate 101.

[0087] The substrate 101 may include a plurality of light emitting elements arranged in an array. There is a certain gap between the substrate 101 and the optical layer 102. The light emitted by the light emitting elements is fully mixed in the gap and then emitted into the optical layer 102 to provide a uniform light source, that is, the backlight module is a direct-type backlight module.

[0088] Each light-emitting element can be a light-emitting diode (LED), a sub-millimeter light-emitting diode (Mini Light Emitting Diode, referred to as Mini LED) or a micro light-emitting diode (Micro Light Emitting Diode, referred to as Micro LED). Typically, the size of a Mini LED is about 100 to 300 μm, and the size of a Micro LED can be less than 100 μm. Mini LED and Micro LED are increasingly being used in the display field because of their advantages such as superior display effects, thin volume, high contrast, and long life. For example, using Mini LED as a light-emitting element of a backlight module can achieve a high dynamic range (HDR) display. When this backlight module is used in a display device, the contrast of the display device can be significantly improved.

[0089] According to another aspect of the present disclosure, a backlight module 100 is provided, which includes: a substrate 101; an optical layer 102 located on the substrate 101; and a plurality of support portions 103 located between the substrate 101 and the optical layer 102. The spacing S between any two adjacent support portions 103 of the plurality of support portions 103 satisfies: Among them, K is a positive number, is a vector whose magnitude It is equal to the maximum allowable sinking amount of the optical layer 102 in the direction perpendicular to the substrate 101 .

[0090] Figure 7 FIG. 3 is a schematic diagram of a display device 300 according to an embodiment of the present disclosure. Figure 7 As shown, the display device 300 includes: the backlight module 100 described in any of the above embodiments, and the display panel 200, the display panel 200 is located at the light emitting side of the backlight module 100, and the backlight module 100 provides light source for the display panel 200, so that the display panel 200 can display. In some embodiments, the display device 300 is a liquid crystal display device.

[0091] The display device 300 may have substantially the same technical effects as the backlight module 100 described in the previous embodiment. Therefore, for the purpose of brevity, the technical effects of the display device 300 will not be described repeatedly herein.

[0092] It will be understood that, although the terms first, second, third, etc. may be used to describe various elements, components, regions, layers and / or parts in this article, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish an element, component, region, layer or part from another element, component, region, layer or part. Therefore, the first element, component, region, layer or part discussed above may be referred to as a second element, component, region, layer or part without departing from the teaching of the present disclosure.

[0093] Spatially relative terms such as "row", "column", "under...", "above...", "left", "right", etc. may be used herein to describe the relationship between one element or feature and another (some) element or feature as illustrated in the figure for ease of description. It will be understood that these spatially relative terms are intended to cover different orientations of the device in use or operation in addition to the orientation depicted in the figure. For example, if the device in the figure is flipped, the element described as "under other elements or features" will be oriented as "above other elements or features". Therefore, the exemplary term "under..." can cover both the orientations of above and below. The device can be oriented in other ways (rotated 90 degrees or in other orientations) and the spatially relative descriptors used in this article are interpreted accordingly. In addition, it will also be understood that when a layer is referred to as "between two layers", it can be the only layer between the two layers, or one or more intermediate layers can also be present.

[0094] The terms used herein are only for the purpose of describing a specific embodiment and are not intended to limit the present disclosure. As used herein, the singular forms "one", "one" and "the" are intended to also include plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "include" and / or "comprise" specify the presence of the features, wholes, steps, operations, elements and / or parts when used in this specification, but do not exclude the presence of one or more other features, wholes, steps, operations, elements, parts and / or their groups or add one or more other features, wholes, steps, operations, elements, parts and / or their groups. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items. In the description of this specification, the description of the reference terms "one embodiment", "another embodiment" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment are included in at least one embodiment of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily have to be directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. Furthermore, those skilled in the art may combine different embodiments or examples and features of different embodiments or examples described in this specification without mutual contradiction.

[0095] It will be understood that when an element or layer is referred to as being "on another element or layer," "connected to another element or layer," "coupled to another element or layer," or "adjacent to another element or layer," it may be directly on another element or layer, directly connected to another element or layer, directly coupled to another element or layer, or directly adjacent to another element or layer, or there may be intermediate elements or layers. Conversely, when an element is referred to as being "directly on another element or layer," "directly connected to another element or layer," "directly coupled to another element or layer," or "directly adjacent to another element or layer," there are no intermediate elements or layers. However, in no case should "on" or "directly on" be interpreted as requiring that one layer completely cover the layer below.

[0096] Embodiments of the present disclosure are described herein with reference to schematic illustrations (and intermediate structures) of idealized embodiments of the present disclosure. As such, variations in the illustrated shapes, for example as a result of manufacturing techniques and / or tolerances, should be expected. Therefore, embodiments of the present disclosure should not be interpreted as being limited to the specific shapes of the zones illustrated herein, but should include shape deviations, for example, due to manufacturing. Therefore, the zones illustrated in the figures are schematic in nature, and their shapes are not intended to illustrate the actual shapes of the zones of the device and are not intended to limit the scope of the present disclosure.

[0097] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present disclosure belongs. It will be further understood that terms such as those defined in commonly used dictionaries should be interpreted as having a meaning consistent with their meaning in the relevant art and / or the context of this specification, and will not be interpreted in an idealized or overly formal sense, unless explicitly defined as such herein.

[0098] As will be appreciated by those skilled in the art, although the various steps of the method in the present disclosure are described in a particular order in the accompanying drawings, this does not require or imply that the steps must be performed in this particular order unless the context clearly indicates otherwise. Additionally or alternatively, multiple steps may be combined into one step for execution, and / or a step may be decomposed into multiple steps for execution. In addition, other method steps may be inserted between steps. The inserted steps may represent improvements to the method such as described herein, or may be unrelated to the method. In addition, a given step may not be fully completed before the next step begins.

[0099] The above is only a specific implementation of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure should be based on the protection scope of the claims.

Claims

1. A backlight module, comprising: substrate; an optical layer, located on the substrate; as well as A plurality of support parts are located between the substrate and the optical layer, The optical layer includes a contact area in contact with the plurality of support portions and a non-contact area not in contact with the plurality of support portions, a first distance between the contact area and the substrate is greater than a second distance between the non-contact area and the substrate, The spacing S between any two adjacent support portions among the plurality of support portions satisfies the following condition: in, is a vector whose magnitude is equal to the maximum value of the difference between the first distance and the second distance, and K is a positive number.

2. The backlight module according to claim 1, wherein: Wherein, the optical layer includes a stacked first optical layer and a second optical layer, ρ1 is the density of the first optical layer, ρ2 is the density of the second optical layer, h1 is the thickness of the first optical layer, h2 is the thickness of the second optical layer, α is the unit length of the optical layer in a first direction, the first direction is parallel to the x-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, E is the Young's modulus of the second optical layer, and g is the gravitational acceleration.

3. The backlight module according to claim 1, wherein: The optical layer includes a stacked first optical layer and a second optical layer, ρ1 is the density of the first optical layer, ρ2 is the density of the second optical layer, h1 is the thickness of the first optical layer, h2 is the thickness of the second optical layer, α is the unit length of the optical layer in a first direction, the first direction is parallel to the x-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, E is the Young's modulus of the second optical layer, g is the gravitational acceleration, b is the width of the optical layer along the second direction, the second direction is parallel to the y-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, I y is the moment of inertia of the cross section of the optical layer relative to the y-axis, the cross section of the optical layer is perpendicular to the plane where the substrate is located, L is the theoretical spacing between any two adjacent support parts among the multiple support parts, and x is any value between 0 and L.

4. The backlight module according to claim 3, wherein:

5. The backlight module according to claim 3, wherein: The first optical layer includes a quantum dot film and a composite film, and the second optical layer includes a diffuser plate.

6. The backlight module according to any one of claims 1 to 5, wherein: S≤245.5mm.

7. The backlight module according to any one of claims 1 to 5, wherein: The range is 0~0.35mm.

8. The backlight module according to any one of claims 1 to 5, wherein: The spacing S between any two adjacent support portions among the plurality of support portions satisfies:

9. The backlight module according to any one of claims 1 to 5, wherein: Each of the plurality of support portions has an effective support range, and the effective support ranges of at least two adjacent support portions of the plurality of support portions partially overlap each other.

10. The backlight module according to any one of claims 1 to 5, wherein: The plurality of support portions are arranged in an array on the substrate.

11. The backlight module according to any one of claims 1 to 5, further comprising a plastic frame, wherein: The plastic frame is arranged between the substrate and the optical layer and along four edges of the optical layer.

12. The backlight module according to any one of claims 1 to 5, wherein: The substrate comprises a plurality of light emitting elements arranged in an array, and the backlight module is a direct-type backlight module.

13. The backlight module according to any one of claims 1 to 5, wherein: The size of the backlight module is 34 inches. The backlight module includes 12 support parts, and the 12 support parts are arranged in 3 rows×4 columns.

14. The backlight module according to any one of claims 1 to 5, wherein: The size of the backlight module is 34 inches. The backlight module includes 21 supporting parts, and the 21 supporting parts are arranged in 3 rows×7 columns.

15. A backlight module, comprising: substrate; an optical layer, located on the substrate; as well as A plurality of support parts are located between the substrate and the optical layer, The spacing S between any two adjacent support portions among the plurality of support portions satisfies the following condition: in, is a vector whose magnitude It is equal to the maximum allowable sinking amount of the optical layer in the direction perpendicular to the substrate, and K is a positive number.

16. A display device, comprising: The backlight module according to any one of claims 1 to 14 or the backlight module according to claim 15; as well as The display panel is located on the light-emitting side of the backlight module.

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