Backlight module and display device

Abstract

A backlight module and a display device including the same are provided. The backlight module includes a substrate, an optical layer on the substrate, and a plurality of support portions between the substrate and the optical layer. The optical layer includes a contact region in contact with the plurality of support portions and a non-contact region not in contact with the plurality of support portions, a first distance between the contact region and the substrate is greater than a second distance between the non-contact region and the substrate, and a pitch S between any two adjacent support portions of the plurality of support portions satisfies the following condition: where is a vector, a modulus of the vector is equal to a maximum value of a difference between the first distance and the second distance, and K is a positive number.

Description

Technical Field

[0001] This disclosure relates to the field of display technology, and more particularly to a backlight module and a display device including the backlight module. Background Technology

[0002] Liquid crystal displays (LCDs) are widely used in the display industry due to their advantages such as thinness, shock resistance, wide viewing angle, and high contrast. An LCD typically consists of a display panel and a backlight, with the display panel usually positioned on the light-emitting side of the backlight to receive the light source. The contrast ratio, brightness uniformity, and stability of an LCD are related to the structure and performance of the backlight. In recent years, mini-LEDs have received widespread attention due to their superior performance and have been applied to backlights. Summary of the Invention

[0003] According to one aspect of this 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 includes a contact area that contacts the plurality of support portions and a non-contact area that does not contact 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 satisfies the following condition: in, For a vector, the magnitude of the vector It is equal to the maximum value of the difference between the first distance and the second distance, where K is a positive number.

[0004] In some embodiments, The optical layer comprises a stacked first optical layer and a second optical layer, where 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 being 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 comprises a stacked first optical layer and a second optical layer, where 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, which 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 due to gravity, b is the width of the optical layer along a second direction, which is parallel to the y-axis of the coordinate system and perpendicular to the thickness direction of the optical layer, and I... y Let be the moment of inertia of the cross section of the optical layer relative to the y-axis, the cross section of the optical layer being perpendicular to the plane of the substrate, L be the theoretical distance between any two adjacent support portions among the plurality of support portions, and x be 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≤245.5mm.

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

[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 supports has an effective support range, and the effective support ranges of at least two adjacent supports partially overlap 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 frame disposed between the substrate and the optical layer and along the 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-lit backlight module.

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

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

[0017] According to another aspect of this 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 satisfies the following condition: in, For a vector, the magnitude of the vector It is equal to the maximum allowable subsidence of the optical layer in the direction perpendicular to the substrate, where K is a positive number.

[0018] According to another aspect of this disclosure, a display device is provided, comprising: a backlight module as described in any of the preceding embodiments; and a display panel located on the light-emitting side of the backlight module. Attached Figure Description

[0019] The exemplary embodiments of this disclosure will be described in detail below with reference to the accompanying drawings, in which:

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

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

[0022] Figure 3 A schematic diagram of the structure of the 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 This illustration shows one arrangement of multiple support portions on a substrate according to an embodiment of the present disclosure;

[0025] Figure 6 This illustrates another arrangement of multiple support portions on a substrate according to embodiments of the present disclosure; and

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

[0027] 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 scope of the disclosure, and need not be drawn strictly to scale. Furthermore, in the drawings, the same or similar reference numerals are used to refer to the same or similar parts. Detailed Implementation

[0028] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0029] Direct-lit backlight modules are increasingly used in display modules, including passive display panels, due to their advantages such as simple manufacturing process, more uniform brightness, and higher light efficiency. A direct-lit backlight module typically consists of a stacked optical layer and a substrate. Multiple light-emitting elements are positioned on the side of the substrate closest to the optical layer. A certain 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 more uniform surface light source.

[0030] In recent years, the industry has attempted to reduce production costs by decreasing the number of light-emitting elements on the substrate. However, reducing the number of light-emitting elements exacerbates the shadowing phenomenon. Increasing the light mixing distance can effectively solve the shadowing problem. However, increasing the light mixing distance means a larger distance between the optical layer and the substrate. During production and transportation, the backlight module is usually in a flat position. If the light mixing distance between the optical layer and the substrate is only achieved through structures such as frames around the four sides of the optical layer, the optical layer will deform due to gravity. Moreover, as the size and / or weight of the optical layer increases, the deformation will become more severe. Thus, when the backlight module operates in a vertical position, it will seriously affect the optical quality of the emitted light. To avoid 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 its unavoidable flat position during production and transportation. However, the inventors of this application have discovered that in related technologies, the number and arrangement of support structures in the backlight module depend entirely on the operator's experience. For the same backlight module, different operators may design vastly different numbers and / or arrangements of support structures, which makes the design of support structures lack a scientific theoretical basis and makes it impossible to achieve the optimal arrangement.

[0031] In view of this, some embodiments of this disclosure provide a backlight module in which the actual spacing between two adjacent support portions depends on a theoretical spacing obtained by fitting the actual theoretical calculation. Arranging the actual spacing of the support portions according to this theoretical spacing allows for a more scientific arrangement of the support portions.

[0032] Figure 1 A schematic diagram of a partial structure of the backlight module 100 is shown. 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 area C that contacts the support portion 103 and a non-contact area that does not contact the support portion 103. Figure 1 Two non-contact areas, NC1 and NC2, are labeled as examples, but in fact, as those skilled in the art will understand, 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 areas 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 103 as the center point, the farther away from the support 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 to the contact area C of the optical layer 102 that contacts the support 103, the non-contact areas of the optical layer 102 that do not contact the support 103 collapse towards the substrate 101, thus giving the optical layer 102 a shape similar to an "umbrella".

[0033] The actual distance S between any two adjacent support parts 103 in the plurality of support parts 103 satisfies: Where K is a positive number, For a vector, the magnitude of the vector It equals the maximum value of the difference between the first distance and the second distance, or in other words, the modulus. This refers to the maximum allowable recess of the optical layer 102 in the direction perpendicular to the substrate 101. For example, as... 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. Hence, the maximum value of the difference between the first distance and the second distance is... It is equal to the difference between the first distance D1 and the second distance D3.

[0034] The embodiments of this disclosure provide a theoretical calculation method for the distance between two adjacent support portions 103, by letting As long as the actual distance 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 emitted light from the backlight module 100.

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

[0036] Figure 1 This can be viewed as a schematic diagram of the support range of a single support part 103. For example... Figure 1 As shown, assuming the optical layer 102 is placed on a single support 103, with the support 103 as the center point, the farther away from the support 103, the greater the torque generated by the weight of the optical layer 102. This results in a greater amount of downward displacement of the optical layer 102 in the direction perpendicular to the substrate 101, causing the optical layer 102 to exhibit an "umbrella-like" shape. From an optical perspective, to ensure the uniformity of the display image of the display device including the backlight module 100, the amount of downward displacement of the optical layer 102 in the direction perpendicular to the substrate 101 must be kept within a certain range. Assuming the maximum allowable downward displacement of the optical layer 102 in the direction perpendicular to the substrate 101 is... Then the maximum sinking amount With the boundary 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 provides support to the optical layer 102 only in the direction perpendicular to the substrate 101, without affecting the movement of the optical layer 102 in the direction parallel to the substrate 101. Considering the portion of the optical layer 102 located between two adjacent support portions 103 as a crossbeam, and the gravity G of this portion of the optical layer 102 as a uniformly distributed load, with the support portion 103 providing a supporting force F to the optical layer 102, the simplified structure and stress condition of the support portion 103 and the optical layer 102 of the backlight module 100 are as follows: Figure 2 As shown.

[0037] Depend on Figure 2 From the simplified structure, it can be seen that the structure satisfies the deflection curve equation:

[0038]

[0039] In equation (1), M represents torque, and x is any value between 0 and L.

[0040] From equation (1), we can obtain the following equation (2):

[0041]

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

[0043]

[0044] in,

[0045] Q=(ρ1h1·ba+ρ2h2·ba)·g

[0046] For both sides and the division,

[0047] get

[0048] Integrate over both sides again,

[0049] get

[0050] when

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

[0052] When x = 0, 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] As a vector, the positive direction is defined as the direction from the substrate 101 to the optical layer 102, and the negative sign after the equal sign in equation (2) indicates... The direction is from optical layer 102 to substrate 101. Optical layer 102 includes a stacked first optical layer and a second optical layer. In equation (2), ρ1 is the density of the first optical layer, in g / mm². 3 ρ2 is the density of the second optical layer, in g / mm². 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 / s². 2 ) / mm 2g is the acceleration due to gravity, with units of m / s². 2 L is the theoretical spacing between two adjacent support parts 103, in mm; x is any value between 0 and L, in mm; α is the unit length of the crossbeam (i.e., optical layer 102) in the simplified structure in the first direction, in mm. The first direction is parallel to the x-axis and perpendicular to the z-axis (i.e., the thickness direction of the optical layer 102) in the coordinate system. Figure 4 As shown; b is the width of the crossbeam (i.e., optical layer 102) in the simplified structure along the second direction, in mm. The second direction is parallel to the y-axis and perpendicular to the z-axis in the coordinate system, as shown. Figure 4 As shown; I y To simplify the structure, the moment of inertia of the cross section along line AA' of the beam (i.e., optical layer 102) relative to the y-axis is given in mm. 4 The cross-section of the optical layer 102 is perpendicular to the plane containing the substrate 101, such as... Figure 4 As shown.

[0058] like Figure 3 As shown, in some embodiments, optical layer 102 includes a stacked first optical layer 1021 and a second optical layer 1022, the second optical layer 1022 being closer to the substrate 101 than the first optical layer 1021. In some embodiments, the second optical layer 1022 is a diffusion plate, where ρ2 in formula (2) refers to the density of the diffusion plate and h2 refers to the thickness of the diffusion plate. The material of the diffusion plate 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, where 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 is understandable that the composite film 1023 can achieve any of the following functions: focusing light at a specific angle (positive viewing angle), modifying various optical coupling phenomena, reducing or avoiding Newton's rings, reducing or avoiding interference fringes, reducing or avoiding black and white spots, and improving light emissivity.

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

[0060]

[0061] Since the individual film layers of optical layer 102 are typically stacked along the z-axis, there is usually no bonding force between the film layers. When diffuser plate 1022 bends, the other film layers on the side of diffuser plate 1022 away from substrate 101 will experience relative displacement and bend accordingly, without increasing the bending strength of diffuser plate 1022. Therefore, in the simplified model above, diffuser plate 1022 mainly provides bending strength, and thus, the moment of inertia of the section of diffuser plate 1022 can be taken as the moment of inertia of the entire optical layer 102. Therefore, equation (3) can be expressed as:

[0062]

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

[0064] The size of b is paired with The size of b has no effect. This is because, as shown in equation (4), when the thickness h2 of the diffuser plate 1022 remains constant, the larger b is, the more I... y The larger b is, the larger the denominator in equation (2) becomes. However, the larger b is, the larger the area of ​​the cross-section of optical layer 102 along line AA', and consequently, the larger the weight G of optical layer 102 becomes, G = (ρ1h1 + ρ2h2)·b·α·g. Therefore, the numerator in equation (2) also becomes larger. The increased numerator and denominator cancel each other out, making The size remains unchanged. For example, suppose we provide optical layer A and optical layer B, where the width of optical layer A along the second direction is b, and the width of optical layer B along the second direction is b + Δb; the weight of optical layer A is G, G = (ρ1h1 + ρ2h2)·b·α·g; and the weight of optical layer B is G + ΔG, G + ΔG = (ρ1h1 + ρ2h2)·(b + Δb)·α·g. Let the maximum subsidence of optical layer A be denoted as... The maximum subsidence of optical layer B is denoted as... According to equations (2) and (4), then:

[0065]

[0066]

[0067] from and As can be seen from the expression, and It is independent of b, therefore, changes in the value of b have no effect on The value has no effect.

[0068] In equation (2), when x equals L / 2, model Reaching the maximum value. Let x = L / 2, Substituting into equation (2), we get:

[0069]

[0070] From equation (5), it can be seen that the theoretical distance L between two adjacent support parts 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 of the optical layer 102 is [not specified]. Within an acceptable range, the flatness of the optical layer 102 can be guaranteed to be within an acceptable range, thereby improving the optical quality of the emitted light from the backlight module 100 and improving the screen uniformity of the display device including the backlight module 100.

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

[0074] The inventors of this application have verified a 34-inch backlight module. The inventors discovered that, for a 34-inch backlight module, when the maximum depth of the optical layer 102... Within the range of 0–0.35 mm, the display device exhibits a screen uniformity greater than 80%, meeting the design requirements. Substituting mm into equation (6), the theoretical distance L between two adjacent support parts 103 of the 34-inch backlight module can be obtained as:

[0075]

[0076] In one exemplary example, the composite film 1023 and the quantum dot film 1024 are made of polystyrene with a density ρ1 of 1.05 g / cm³. 3 The diffuser plate 1022 is made of polyethylene terephthalate, with a density ρ² of 1.39 g / cm³. 3 The combined 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, with a value of 2900 MPa; and g is the acceleration due to gravity, with a value of 9.8 m / s². 2It is 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 multiple sub-layers stacked sequentially, such as at least two of diffuser sheets, prism sheets, brightness enhancement films, and brightness enhancement films, 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 multiple sub-layers.

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

[0078] In the embodiments of this disclosure, a support range theory for a single support portion 103 is proposed, a calculation method for 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 this theoretical spacing L. In this way, the design of the support portion 103 can rely on scientific theoretical basis, allowing for a more rational design of the number of support portions 103 in the backlight module 100, achieving 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 emitted light from the backlight module 100 and ensuring the uniformity of the display screen. On the other hand, by relying on the theoretical spacing L to arrange multiple support portions 103, 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.

[0079] Based on the theoretical spacing L between two adjacent support portions 103, multiple support portions 103 on the substrate 101 can be arranged. 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 5An arrangement of multiple support portions 103 on a substrate 101 is shown. In this arrangement, the actual distance S between two adjacent support portions 103 is equal to the theoretical distance L. For example, when the substrate 101 is a 34-inch substrate, the actual distance S between two adjacent support portions 103 can be equal to 245.5 mm. A total of 12 support portions 103 are arranged on the substrate 101 in an array. This regular array arrangement helps to better cover the entire optical layer 102 with the effective support range of the multiple support portions 103. 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 distance between two adjacent support portions 103 provided in the embodiments of this disclosure, a 34-inch backlight module only needs 12 support portions 103 to ensure the flatness of the entire optical layer 102 within the support range of the support portions 103, prevent the optical layer 102 from collapsing excessively, thereby ensuring the optical quality of the emitted light from the backlight module and improving the uniformity of the display device.

[0081] refer to Figure 5 Each support 103 has an effective support range ( Figure 5 (Using the area indicated by the dashed circle), the effective support ranges of at least two adjacent support portions 103 among the 12 support portions 103 partially overlap each other. For example... Figure 5 As shown, in the horizontal direction, the effective support ranges of two adjacent support portions 103 only partially overlap; in the vertical direction, the effective support ranges of three adjacent support portions 103 only partially overlap. To ensure that the entire optical layer 102 can be supported by the support portions 103, the effective support ranges of adjacent support portions 103 need to overlap. However, to minimize the number of support portions 103 used, the overlap range of the effective support ranges of adjacent support portions 103 cannot be too large; they cannot completely overlap, but only partially overlap. This allows for minimizing the number of support portions 103 while maintaining 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 state of the optical layer 102, and is beneficial for subsequent inspection and analysis of defects. In some embodiments, the effective support range of each support portion 103 is circular.

[0082] Figure 6Another arrangement of multiple support portions 103 on a substrate 101 is shown. In this arrangement, the actual distance S between two adjacent support portions 103 is less than the theoretical distance L. Theoretically, although the flatness of the optical layer 102 can be guaranteed as long as the actual distance S between two adjacent support portions 103 is equal to the theoretical distance L, as those skilled in the art know, during the manufacturing stage of the backlight module, tests such as vibration tests and packaging drop tests are required to ensure the product reliability of the backlight module. Since there is a certain gap between the various film layers of the backlight module, each film layer will vibrate in the z-axis direction during vibration tests and / or packaging drop tests. The gravity and impact force of each film layer will then be transmitted to the substrate 101 through the support portions 103, and multiple light-emitting elements are arranged on the substrate 101. If the number of support portions 103 is too small, the force transmitted to the substrate 101 by a single support portion 103 will be very large, and the substrate 101 will be at risk of cracking. Therefore, appropriately increasing the number of support portions 103 is beneficial for safely passing vibration tests and / or packaging drop tests, and for preventing the substrate 101 from cracking. Therefore, when actually arranging the support portions 103 of the backlight module, at least the following two factors need to be considered: (1) the actual distance S between two adjacent support portions 103 cannot be greater than the theoretical distance L; (2) on the basis that the actual distance S between two adjacent support portions 103 is not greater than the theoretical distance L, in order to ensure safe passage of vibration tests and / or packaging drop tests, the actual distance S between two adjacent support portions 103 should be appropriately reduced, so as to appropriately increase the number of support portions 103.

[0083] In some embodiments, the actual distance S between two adjacent support portions 103 is equal to half of the theoretical distance 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 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 × 7 columns. The effective support area 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 individual vibration tests and packaging drop tests.

[0084] Figure 6 The arrangement of the support portion 103 shown is conducive to achieving the optimal arrangement of the support portion 103. It can not only ensure the flatness of the optical layer 102, but also ensure that the backlight module can safely pass the individual vibration test and the packaging drop test, thus ensuring the reliability of the product.

[0085] 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 usually limited by the equipment used to attach the support portions 103. The equipment used to attach the support portions 103 usually attaches the support portions 103 along the long side of the backlight module, so multiple support portions 103 are usually arranged in a rectangular shape.

[0086] For backlight modules with a light mixing distance, in order to avoid the entire weight of the optical layer 102 pressing on the support 103, resulting in excessive force transmitted to the substrate 101 and the risk of cracking at the edge of the substrate 101, in some embodiments, a frame is also provided between the substrate 101 and the optical layer 102. The frame is provided along the four edges of the optical layer 102. In this way, the frame can support the optical layer 102 from the edge, and the support 103, which was originally located at the edge of the substrate 101, can move inward to the interior of the substrate 101, thus preventing the edge of the substrate 101 from cracking.

[0087] The substrate 101 may include multiple 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 enters the optical layer 102 to provide a uniform light source. That is, the backlight module is a direct-lit backlight module.

[0088] Each light-emitting element can be a light-emitting diode (LED), a mini light-emitting diode (Mini LED), or a micro light-emitting diode (Micro LED). Typically, Mini LEDs are approximately 100–300 μm in size, while Micro LEDs can be smaller than 100 μm. Due to their advantages such as superior display performance, thin and light size, high contrast ratio, and long lifespan, Mini LEDs and Micro LEDs are increasingly being used in the display field. For example, using Mini LEDs as the light-emitting element in a backlight module can achieve High Dynamic Range (HDR) displays. When such a backlight module is applied to a display device, it can significantly improve the contrast ratio of the display device.

[0089] According to another aspect of this disclosure, a backlight module 100 is provided, comprising: 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: Where K is a positive number, For a vector, the magnitude of the vector This is equal to the maximum allowable subsidence of the optical layer 102 in the direction perpendicular to the substrate 101.

[0090] Figure 7 A schematic diagram of a display device 300 according to an embodiment of the present disclosure is shown. For example... Figure 7 As shown, the display device 300 includes a backlight module 100 as described in any of the preceding embodiments, and a display panel 200. The display panel 200 is located on the light-emitting side of the backlight module 100, and the backlight module 100 provides a light source for the display panel 200 to perform display. In some embodiments, the display device 300 is a liquid crystal display device.

[0091] The display device 300 can have essentially the same technical effects as the backlight module 100 described in the previous embodiments. Therefore, for the sake of brevity, the technical effects of the display device 300 will not be described again here.

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

[0093] Spatial relative terms such as “row,” “column,” “below,” “above,” “left,” “right,” etc., may be used herein for ease of description to describe the relationship between one element or feature illustrated in the figures and another element(s). It will be understood that these spatial relative terms are intended to cover different orientations of the device in use or operation, in addition to those depicted in the figures. For example, if the device in the figure is flipped, then an element described as “below other elements or features” will be oriented “above other elements or features.” Thus, the exemplary term “below” can cover both orientations above and below. Devices may be oriented in other ways (rotated 90 degrees or otherwise) and the spatial relative descriptors used herein will be interpreted accordingly. Additionally, it will be understood that when a layer is referred to as “between two layers,” it may be the only layer between those two layers, or there may be one or more intermediate layers.

[0094] The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit this disclosure. As used herein, the singular forms “a,” “an,” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprising” and / or “including”, when used in this specification, specify the presence of the stated features, integrals, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components, and / or groups thereof. 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, references to the terms “one embodiment,” “another embodiment,” etc., mean that a specific feature, structure, material, or characteristic described in connection with that embodiment is included in at least one embodiment of this disclosure. The illustrative expressions of the foregoing terms in this specification do not necessarily refer to the same embodiments or examples. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine the different embodiments or examples described herein and the features of the different embodiments or examples without contradiction.

[0095] It will be understood that when a component or layer is referred to as "on another component or layer," "connected to another component or layer," "coupled to another component or layer," or "adjacent to another component or layer," it may be directly on another component or layer, directly connected to another component or layer, directly coupled to another component or layer, or directly adjacent to another component or layer, or there may be intermediate components or layers. Conversely, when a component is referred to as "directly on another component or layer," "directly connected to another component or layer," "directly coupled to another component or layer," or "directly adjacent to another component or layer," no intermediate components or layers exist. However, in any case, "on" or "directly on" should not be interpreted as requiring a layer to completely cover the layer below.

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

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

[0098] As those skilled in the art will understand, although the steps of the methods in this disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in that specific order unless the context clearly indicates otherwise. Additional or alternatively, multiple steps may be combined into a single step, and / or a single step may be broken down into multiple steps. Furthermore, other method steps may be inserted between steps. Inserted steps may represent improvements to the method described herein, or may be unrelated to the method. Moreover, a given step may not be fully completed before the next step begins.

[0099] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A backlight module, comprising: a substrate; an optical layer on the substrate; and a plurality of support portions between the substrate and the optical layer, wherein the optical layer comprises a contact region in contact with the plurality of support portions and a non-contact region not in contact with the plurality of support portions, a first distance between the contact region and the substrate is greater than a second distance between the non-contact region and the substrate, wherein a spacing S between any two adjacent support portions of the plurality of support portions satisfies the following condition:

2. The backlight module of claim 1, wherein: ， wherein is a vector, the modulus of which is equal to the maximum of the difference between the first distance and the second distance, K being a positive number, , the optical layer comprising a first optical layer and a second optical layer stacked, is the density of the first optical layer, is the density of the second optical layer, hi is the thickness of the first optical layer, h2 is the thickness of the second optical layer, a is the unit length of the optical layer in a first direction, the first direction being parallel to the x-axis of a 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 due to gravity. the first optical layer comprises a quantum dot film and a composite film, and the second optical layer comprises a diffusion plate. ， wherein b is a width of the optical layer along a second direction parallel to a y-axis of a coordinate system and perpendicular to a thickness direction of the optical layer, I y is a moment of inertia of the cross section of the optical layer with respect to the y-axis, the cross section of the optical layer being perpendicular to a plane on which the substrate lies, L is a theoretical interval between any two adjacent support portions of the plurality of support portions, and x is any numerical value between 0 and L.

3. The backlight module of claim 2, wherein, 。 4. The backlight module of claim 2, wherein, S < 245.5 mm.

5. The backlight module of any of claims 1-4, wherein, each support portion 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.

6. The backlight module of any of claims 1-4, wherein, the range of 0 to 0.35 mm.

7. The backlight module of any of claims 1-4, wherein, The interval S between any two adjacent support portions in the plurality of support portions satisfies: .

8. The backlight module of any of claims 1-4, wherein, the plurality of support portions are arranged in an array on the substrate.

9. The backlight module of any of claims 1-4, wherein, the gasket is arranged between the substrate and the optical layer and along four edges of the optical layer.

10. The backlight module of any one of claims 1-4, further comprising a gasket, wherein, the substrate comprises a plurality of light emitting elements arranged in an array, and the backlight module is a direct-lit backlight module.

11. The backlight module of any of claims 1-4, wherein, 14. A backlight module, comprising:

12. The backlight module of any of claims 1-4, wherein, The backlight module is 34 inches in size and includes 12 support sections arranged in 3 rows. 4 columns.

13. The backlight module of any of claims 1-4, wherein, The backlight module is 34 inches in size and includes 21 support sections arranged in three rows. 7 columns. a substrate; an optical layer on the substrate; and a plurality of support portions between the substrate and the optical layer, wherein a spacing S between any two adjacent support portions of the plurality of support portions satisfies the following condition:

15. A backlight module, comprising: a substrate; ， wherein is a vector whose modulus is equal to the maximum amount of sagging allowed by the optical layer in a direction perpendicular to the substrate, K being a positive number, , the optical layer comprising a first optical layer and a second optical layer stacked, is the density of the first optical layer, is the density of the second optical layer, hi is the thickness of the first optical layer, h2 is the thickness of the second optical layer, a is the optical layer's length per unit in a first direction, the first direction being parallel to the x-axis of a 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 due to gravity. an optical layer on the substrate; and a plurality of support portions between the substrate and the optical layer, wherein the optical layer comprises a contact region in contact with the plurality of support portions and a non-contact region not in contact with the plurality of support portions, a first distance between the contact region and the substrate is greater than a second distance between the non-contact region and the substrate, wherein a spacing S between any two adjacent support portions of the plurality of support portions satisfies the following condition:

17. A display device, comprising: the backlight module of any one of claims 1-16; and a display panel on a light exit side of the backlight module. ， wherein is a vector whose modulus is equal to the maximum of the difference between said first distance and said second distance, K being a positive number, and wherein the value of p1 is 1.05 g / cm 3 , the value of p2 is 1.39 g / cm 3 , the value of hi is 0.72 mm, the value of h2 is 3 mm, the value of a is 1 mm, the value of E is 2900 MPa, and the value of g is 9.8 m / s 2 .

16. The backlight module of claim 15, wherein, ， wherein b is a width of the optical layer along a second direction parallel to a y-axis of a coordinate system and perpendicular to a thickness direction of the optical layer, I y is a moment of inertia of the cross section of the optical layer with respect to the y-axis, the cross section of the optical layer being perpendicular to a plane on which the substrate is located, L is a theoretical interval between any two adjacent support portions of the plurality of support portions, x is any numerical value between 0 and L, the optical layer includes a first optical layer and a second optical layer stacked, the first optical layer includes a quantum dot film and a composite film, and the second optical layer includes a diffusion plate. ​ ​ ​ ​

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