Backlight module and display apparatus

Abstract

A backlight module (100) and a display apparatus (300) comprising the backlight module (100). The backlight module (100) comprises 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 optical layer (102) comprises a contact area in contact with the plurality of support portions (103) and a non-contact area not in contact with the plurality of support portions (103). A first distance between the contact area and the substrate (101) is greater than a second distance between the non-contact area and the substrate (101), and a spacing S between any two adjacent support portions (103) amongst the plurality of support portions (103) meets the following conditions: formula (I), wherein (II) is a vector, a modulus (III) of the vector is equal to the maximum value of a difference between the first distance and the second distance, and K is a positive number.

Description

Backlight module, display device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application No. 202310787698.5 filed on June 29, 2023, the entire disclosure of which is incorporated herein by reference. Technical Field

[0003] 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

[0004] Liquid crystal display devices are widely used in the display field due to their advantages such as lightness, good shock resistance, wide viewing angle, and high contrast. Liquid crystal display devices generally include a display panel and a backlight source. The display panel is usually 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.

[0005] Summary of the Invention

[0006] 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 supporting portions located between the substrate and the optical layer. The optical layer comprises a contact area in contact with the plurality of supporting portions and a non-contact area not in contact with the plurality of supporting 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. A spacing S between any two adjacent supporting portions among the plurality of supporting 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.

[0007] 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 acceleration of gravity.

[0008] 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, g is the acceleration of gravity, 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 distance between any two adjacent support parts among the multiple support parts, and x is any value between 0 and L.

[0009] In some embodiments,

[0010] 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.

[0011] In some embodiments, S≤245.5 mm.

[0012] In some embodiments, The range is 0~0.35mm.

[0013] In some embodiments, the spacing S between any two adjacent support portions among the plurality of support portions satisfies:

[0014] 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.

[0015] In some embodiments, the plurality of support portions are arranged in an array on the substrate.

[0016] In some embodiments, the backlight module further includes a plastic frame, which is arranged between the substrate and the optical layer and along four edges of the optical layer.

[0017] In some embodiments, the substrate includes a plurality of light-emitting elements arranged in an array, and the backlight module is a direct-lit backlight module.

[0018] In some embodiments, the size of the backlight module is 34 inches, and the backlight module includes 12 supporting parts, and the 12 supporting parts are arranged in 3 rows×4 columns.

[0019] In some embodiments, the size of the backlight module is 34 inches, and the backlight module includes 21 supporting parts, and the 21 supporting parts are arranged in 3 rows×7 columns.

[0020] 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.

[0021] According to another aspect of the present disclosure, a display device is provided, comprising: the backlight module described in any one of the above embodiments; and a display panel located on a light-emitting side of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Hereinafter, various exemplary embodiments of the present disclosure will be described in detail with reference to the accompanying drawings, in which:

[0023] FIG1 is a schematic diagram showing a partial structure of a backlight module according to an embodiment of the present disclosure;

[0024] FIG2 is 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;

[0025] FIG3 shows a schematic structural diagram of an optical layer according to an embodiment of the present disclosure;

[0026] FIG4 shows a schematic cross-sectional view of an optical layer according to an embodiment of the present disclosure;

[0027] FIG5 shows an arrangement of multiple support portions on a substrate according to an embodiment of the present disclosure;

[0028] FIG6 shows another arrangement of multiple support portions on a substrate according to an embodiment of the present disclosure; and

[0029] FIG7 shows a schematic structural diagram of a display device according to an embodiment of the present disclosure.

[0030] It should be understood that the accompanying drawings are merely schematic illustrations of exemplary embodiments of the present disclosure and are not intended to limit 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

[0031] The following will be combined with the accompanying drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the embodiments described are only part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present disclosure.

[0032] Direct-lit backlight modules are increasingly being used in display modules, including passive display panels, due to their advantages such as simple manufacturing, more uniform brightness, and higher light efficiency. Direct-lit backlight modules typically consist of a stacked optical layer and a substrate. Multiple light-emitting elements are positioned on the substrate's side near the optical layer. A certain optical distance (OD) must be maintained between the substrate and the optical layer. This allows the light emitted by the light-emitting elements to be fully mixed before entering the optical layer, thereby providing a surface light source with more uniform brightness across the entire area.

[0033] In recent years, the industry has attempted 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 side areas 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 is working in a vertical state, it will seriously affect the optical quality of the light emitted by 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 this application discovered that, in related technologies, the number and layout 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 layout 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 layout.

[0034] 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.

[0035] Figure 1 shows a schematic diagram of a partial structure of a backlight module 100. As shown in Figure 1, the backlight module 100 includes: a substrate 101; an optical layer 102 positioned on the substrate 101; and multiple supporting portions 103 positioned between the substrate 101 and the optical layer 102. For simplicity, Figure 1 shows only a single supporting portion 103. The optical layer 102 includes a contact area C that contacts the supporting portion 103 and a non-contact area that does not contact the supporting portion 103. Figure 1 illustrates two non-contact areas NC1 and NC2 as an example. However, as those skilled in the art will appreciate, the optical layer 102 may include an infinite number of non-contact areas. The distance between the contact area C and the substrate 101 is a first distance, and the distance between the non-contact area and the substrate 101 is a second distance, with the first distance being 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 torque generated by the optical layer 102 due to its own weight, 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 is in contact with the support portion 103, the non-contact area of ​​the optical layer 102 that is not in contact with the support portion 103 collapses toward the direction close to the substrate 101, so that the optical layer 102 presents an "umbrella-like" shape.

[0036] 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 Refers to the maximum allowable sinking amount of the optical layer 102 in the direction perpendicular to the substrate 101. For example, as shown in FIG1 , 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.

[0037] The embodiment of the present disclosure provides a theoretical calculation method for the distance between two adjacent support parts 103, by making As long as the actual distance S between two adjacent support portions 103 meets this condition, the optical layer 102 can be prevented from excessive deformation, 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.

[0038] The theoretical basis for designing the actual spacing S between two adjacent support portions 103 will be described in more detail below.

[0039] FIG1 can be regarded as a schematic diagram of the support range of a single support portion 103. As shown in FIG1 , 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, thereby making the optical layer 102 present 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 With L as the boundary, the support range of a single support portion 103 can form a circle with a diameter of L. To calculate the support range of a single support portion 103, two adjacent support portions 103 can be considered 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 considered as a beam, and the gravity G of this portion of the optical layer 102 is considered as a uniformly distributed load. The support portion 103 provides a supporting 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 shown in Figure 2.

[0040] From the simplified structure of Figure 2, it can be seen that the structure satisfies the deflection curve equation:

[0041] In formula (1), M represents the moment, and x is any value between 0 and L.

[0042] From formula (1), we can get the following formula (2):

[0043] The derivation process from formula (1) to formula (2) is as follows:

[0044] in, Q=(ρ1h1·ba+ρ2h2·ba)·g

[0045] Integrating both sides,

[0046] get

[0047] Integrate both sides again,

[0048] get

[0049] when

[0050] hour, Will Substituting into formula (I), we get

[0051] When x=0, Set x = 0 and Substituting into formula (II), we get D = 0,

[0052] Will D=0, Q=(ρ1h1·ba+ρ2h2·ba)·g are substituted into formula (II),

[0053] get

[0054] Therefore

[0055] is a vector, the positive direction of which is the direction from the substrate 101 to the optical layer 102. The negative sign after the equal sign in formula (2) indicates The direction of 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 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, unit is 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), as shown in FIG4 ; b is the width of the beam (i.e., 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 FIG4 ; I yTo 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, as shown in FIG4 .

[0056] As shown in FIG3 , in some embodiments, the optical layer 102 includes a stacked first optical layer 1021 and a second optical layer 1022, wherein 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 embodiments, 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 embodiments, ρ1 in formula (2) refers to the density of the composite film 1023 and the quantum dot film 1024, and h1 refers to the combined 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 can be understood 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 output rate.

[0057] As mentioned above, I y It refers to 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 in the simplified structure. As shown in FIG4 , in some embodiments, the shape of the cross section may be a rectangle. y Characterizes the bending strength of the optical layer 102. y It can be expressed as:

[0058] Since the various film layers of the optical layer 102 are usually stacked along the z-axis, there is usually no connection force between the film layers. When the diffuser plate 1022 bends, the other film layers located on the side of the diffuser plate 1022 away from the substrate 101 will produce relative displacement and bend accordingly, without increasing the bending strength of the diffuser plate 1022. Therefore, in the above simplified model, it is mainly the diffuser plate 1022 that provides the bending strength. Therefore, the cross-sectional moment of inertia of the diffuser plate 1022 can be used as the cross-sectional moment of inertia of the entire optical layer 102. Therefore, formula (3) can be expressed as:

[0059] In some embodiments, the thickness h2 of the diffuser 1022 is 2.5 mm. Substituting h2=2.5 mm into equation (4), we can obtain I y =1.302b.

[0060] The size of b This is because, as can be seen from formula (4), when the thickness h2 of the diffuser 1022 remains unchanged, the larger b is, the larger I y The larger the value, the larger the denominator in formula (2). However, the larger the value of b, the larger the cross-sectional area of ​​the optical layer 102 along the AA' line. Consequently, the weight G of the optical layer 102 is also larger, G = (ρ1h1+ρ2h2)·b·α·g. Therefore, the numerator in formula (2) is also larger. The increased numerator and denominator cancel each other out, making 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), then:

[0061] from and It can be seen from the expression that and It has nothing to do with b, so the value of b changes The value of has no effect.

[0062] 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:

[0063] From formula (5), it can be seen that the theoretical distance L between two adjacent support portions 103 satisfies the following equation:

[0064] 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, thereby ensuring that the flatness of the optical layer 102 is within the allowable range, improving the optical quality of the outgoing light of the backlight module 100 , and further improving the picture uniformity of the display device including the backlight module 100 .

[0065] According to formula (6), Right now

[0066] The inventor of this 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%, which meets 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:

[0067] 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 diffuser plate 1022 is polyethylene terephthalate, and its density ρ2 is 1.39 g / cm3. The combined thickness h1 of composite film 1023 and quantum dot film 1024 is 0.72 mm. The thickness h2 of diffuser plate 1022 is 3 mm. α is 1 mm. E is the Young's modulus of diffuser plate 1022, which is 2900 MPa. g is the acceleration due to gravity, which is 9.8 m / s. 2 It is understood that, in some embodiments, the composite film 1023 is a composite film material that integrates multiple functions. In some embodiments, the composite film 1023 may include multiple sub-layers stacked in sequence, such as at least two of a diffuser, a prism, a light-enhancing film, and a brightness-enhancing film. The substrate materials used in each sub-layer are the same, i.e., they have the same density ρ1. The thickness of the composite film 1023 is the sum of the thicknesses of the multiple sub-layers.

[0068] Substituting the values ​​of the above parameters into equation (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 multiple support portions 103 is equal to 245.5 mm. Therefore, when designing a 34-inch backlight module, as long as the actual spacing S between any 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 image uniformity of the display device will be greater than 80%, meeting the design requirements.

[0069] In the embodiments of the present disclosure, a support range theory for a single support portion 103 is proposed, a method for calculating 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 more reasonably designed to achieve an 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 kept within the allowable range of optical requirements, thereby improving the optical quality of the light emitted from the backlight module 100 and ensuring the uniformity of the image of the display device. On the other hand, by arranging multiple support portions 103 based on the theoretical spacing L, since the support portions 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.

[0070] The plurality of support portions 103 can be arranged on the substrate 101 based on the theoretical spacing L between two adjacent support portions 103. The arrangement of the plurality of support portions 103 should meet two conditions: (1) the number of support portions 103 should be as small as possible; and (2) the effective support range of the plurality of support portions 103 can cover the entire optical layer 102.

[0071] FIG5 shows an arrangement of multiple support portions 103 on a substrate 101. In this arrangement, the actual spacing S between two adjacent support portions 103 among the multiple 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 multiple support portions 103 can 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 multiple 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 requires 12 support parts 103, so that the entire optical layer 102 can be within the support range of the support parts 103, 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.

[0072] Referring to Figure 5 , each support portion 103 has an effective support range (indicated by the dashed circle in Figure 5 ). The effective support ranges of at least two adjacent support portions 103 among the 12 support portions 103 partially overlap. As shown in Figure 5 , horizontally, the effective support ranges of two adjacent support portions 103 only partially overlap; vertically, the effective support ranges of three adjacent support portions 103 only partially overlap. To ensure that the entire optical layer 102 is supported by the support portions 103, the effective support ranges of adjacent support portions 103 must overlap. However, to minimize the number of support portions 103 used, the overlap of the effective support ranges of adjacent support portions 103 should be limited to a minimum, not completely, but only partially. This minimizes the number of support portions 103 while ensuring the flatness of the optical layer 102. Reducing the number of support portions 103 facilitates clearer observation of the arrangement of the support portions 103 and the condition of the optical layer 102, facilitating subsequent inspection and analysis of defects. In some embodiments, the effective supporting range of each supporting portion 103 is circular.

[0073] FIG6 illustrates another arrangement of multiple support portions 103 on substrate 101. In this arrangement, the actual spacing S between two adjacent support portions 103 is less than the theoretical spacing L. While the optical layer 102 can theoretically maintain smoothness as long as the actual spacing S between two adjacent support portions 103 is equal to the theoretical spacing L, as those skilled in the art will appreciate, during the backlight module manufacturing phase, tests such as vibration testing and packaging material drop testing are required to ensure product reliability. Because there are certain gaps between the various film layers of the backlight module, during vibration testing and / or packaging material drop testing, each film layer vibrates in the z-axis direction. The gravity and impact forces of each film layer are thus transmitted through the support portions 103 to substrate 101, which is provided with multiple light-emitting elements. If the number of support portions 103 is too small, the force transmitted to substrate 101 by a single support portion 103 can be significant, potentially posing a risk of cracking. 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.

[0074] 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 the substrate 101 in Figure 6 is a 34-inch substrate, the actual spacing S between two adjacent support portions 103 among the multiple support portions 103 can be equal to 122.75 mm. Twenty-one support portions 103 can be arranged on the substrate 101 in an array, for example, in 3 rows x 7 columns. The effective support range of the 21 support portions 103 can completely cover the area of ​​the optical layer 102, ensuring the flatness of the optical layer 102. This arrangement has been verified to safely pass single-unit vibration tests and packaging material drop tests.

[0075] The arrangement of the support portion 103 shown in FIG6 is conducive to optimizing the arrangement of the support portion 103 , which not only ensures the flatness of the optical layer 102 , but also ensures that the backlight module safely passes the single-unit vibration test and the packaging material drop test, thereby ensuring product reliability.

[0076] In addition, the arrangement of the support portions 103 is not only limited by the theoretical spacing L between two adjacent support portions 103, but is also typically limited by the equipment used to attach the support portions 103. The equipment used to attach the support portions 103 typically attaches the support portions 103 along the long sides of the backlight module. Therefore, the multiple support portions 103 are typically arranged in a rectangular shape.

[0077] For backlight modules with a light mixing distance, in order to prevent the entire weight of the optical layer 102 from being placed on the support portion 103, which would result in excessive force being transferred to the substrate 101 and the risk of cracking the edges of the substrate 101, in some embodiments, a plastic frame is provided between the substrate 101 and the optical layer 102. The plastic frame is provided along the four edges of the optical layer 102. In this way, the plastic frame can support the optical layer 102 from the edges, and the support portion 103 originally provided at the edge of the substrate 101 can be moved toward the interior of the substrate 101, thereby preventing cracking of the edges of the substrate 101.

[0078] 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.

[0079] 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. Since Mini LED and Micro LED have advantages such as superior display effects, light and thin volume, high contrast, and long life, they are increasingly used in the display field. For example, using Mini LED as the light-emitting element of a backlight module can achieve 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.

[0080] According to another aspect of the present disclosure, a backlight module 100 is provided. 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. The spacing S between any two adjacent support portions 103 in 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 .

[0081] Figure 7 shows a schematic diagram of a display device 300 according to an embodiment of the present disclosure. As shown in Figure 7, the display device 300 includes: a backlight module 100 as described in any of the previous embodiments; and a display panel 200. The display panel 200 is located on the light-emitting side of the backlight module 100. The backlight module 100 provides light for the display panel 200, enabling the display panel 200 to display. In some embodiments, the display device 300 is a liquid crystal display device.

[0082] The display device 300 can 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 repeatedly described here.

[0083] It will be understood that although the terms first, second, third, etc. may be used to describe various elements, components, areas, layers and / or parts in this article, these elements, components, areas, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, area, layer or part from another element, component, area, layer or part. Therefore, the first element, component, area, layer or part discussed above can be referred to as the second element, component, area, layer or part without departing from the teachings of the present disclosure.

[0084] Spatially relative terms such as "row," "column," "under," "above," "left," "right," and the like may be used herein to describe the relationship of one element or feature to another element or feature as illustrated in the figures for ease of description. It will be understood that these spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. 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." Thus, the exemplary term "under" can encompass both orientations of above and below. The device can be oriented otherwise (rotated 90 degrees or in other orientations) and the spatially relative descriptors used herein 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 may also be present.

[0085] The terms used herein are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. As used herein, the singular forms "one", "an" and "the" are intended to also include the plural forms, unless the context clearly indicates otherwise. It will be further understood that the terms "include" and / or "comprise" when used in this specification specify the presence of the features, wholes, steps, operations, elements and / or parts, 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 target 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.

[0086] It will be understood that when an element or layer is referred to as being “on,” “connected to,” “coupled to,” or “adjacent to” another element or layer, it can be directly on, directly connected to, directly coupled to, or directly adjacent to another element or layer, or intervening elements or layers may be present. In contrast, when an element is referred to as being “directly on,” “directly connected to,” “directly coupled to,” or “directly adjacent to” another element or layer, no intervening elements or layers are present. However, in no case should “on” or “directly on” be interpreted as requiring that one layer completely cover the underlying layer.

[0087] Embodiments of the present disclosure are described herein with reference to schematic illustrations (and intermediate structures) of idealized embodiments of the present disclosure. Because of this, 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 regions illustrated herein, but should include shape deviations, for example, due to manufacturing. Therefore, the regions illustrated in the figures are schematic in nature, and their shapes are not intended to illustrate the actual shape of the regions of the device and are not intended to limit the scope of the present disclosure.

[0088] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by those skilled 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.

[0089] As will be appreciated by those skilled in the art, although the various steps of the method of 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 that particular order unless the context clearly indicates otherwise. Additionally or alternatively, multiple steps may be combined into a single step and / or a single step may be broken down into multiple steps and performed. In addition, other method steps may be inserted between steps. An inserted step may represent an improvement to a method such as that described herein, or may be unrelated to the method. In addition, a given step may not be fully completed before the next step begins.

[0090] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection 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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