Backlight module and manufacturing method thereof, and display device

Abstract

The disclosed embodiments provide a backlight module and a manufacturing method thereof, and a display device, which relate to the field of display technology and can reduce the probability of relative displacement of some optical films. The backlight module includes a composite layer, and the composite layer includes a light guide layer and a first substrate that are relatively arranged, and a plurality of first microprisms and a plurality of second microprisms located between the light guide layer and the first substrate. The plurality of first microprisms are located on a side surface of the light guide layer close to the first substrate, and the extension directions of the plurality of first microprisms are all parallel to the first direction. The plurality of second microprisms are located on a side surface of the first substrate close to the light guide layer, and the extension directions of the plurality of second microprisms are all parallel to the second direction. The first microprism is fixedly connected to the second microprism.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a backlight module and a manufacturing method thereof, and a display device. Background Art

[0002] TFT-LCD (Thin Film Transistor Liquid Crystal Display) is a flat panel display device that is increasingly being used in the field of high-performance displays due to its small size, low power consumption, no radiation, and relatively low manufacturing cost.

[0003] TFT-LCD has a backlight unit (BLU) for providing backlight to the display panel. The backlight unit includes multiple stacked optical films. When the display device is in use, tested or transported, some of the optical films will move relative to each other, resulting in wrinkles, resulting in defects such as Newton rings and moiré patterns on the displayed image. Summary of the invention

[0004] The embodiments of the present invention provide a backlight module and a manufacturing method thereof, and a display device, which can reduce the probability of relative displacement of a part of an optical film.

[0005] To achieve the above object, the embodiments of the present invention adopt the following technical solutions:

[0006] In one aspect of the present disclosure, a backlight module is provided, the backlight module comprising a composite layer, the composite layer comprising a light guide layer and a first substrate which are arranged opposite to each other, and a plurality of first microprisms and a plurality of second microprisms located between the light guide layer and the first substrate; the plurality of first microprisms are located on a side surface of the light guide layer close to the first substrate; the extension directions of the plurality of first microprisms are all parallel to the first direction; the plurality of second microprisms are located on a side surface of the first substrate close to the light guide layer; the extension directions of the plurality of second microprisms are all parallel to the second direction; the first microprisms are fixedly connected to the second microprisms; the first direction intersects with the second direction, and the planes where the first direction and the second direction are located are parallel to the light emitting surface of the light guide layer.

[0007] In some embodiments of the present disclosure, the composite layer also includes a second substrate; the second substrate is located between the multiple first microprisms and the multiple second microprisms; a side surface of the second substrate close to the first substrate is connected to the multiple second microprisms, and a side surface of the second substrate close to the light guide layer is connected to the multiple first microprisms.

[0008] In some embodiments of the present disclosure, the second substrate is an adhesive layer or a transparent resin film layer.

[0009] In some embodiments of the present disclosure, the composite layer also includes a third substrate and a fourth substrate that are stacked and connected to each other; the third substrate and the fourth substrate are located between the multiple first microprisms and the multiple second microprisms; a side surface of the third substrate close to the first substrate is connected to the multiple second microprisms; a side surface of the fourth substrate close to the light guide layer is connected to the multiple first microprisms.

[0010] In some embodiments of the present disclosure, the plurality of first micro-prisms are in direct contact with the plurality of second micro-prisms and are an integral structure.

[0011] In some embodiments of the present disclosure, a groove is provided on the first microprism at a position intersecting with the second microprism, and a portion of the second microprism is located in the groove; or, a groove is provided on the second microprism at a position intersecting with the first microprism, and a portion of the first microprism is located in the groove.

[0012] In some embodiments of the present disclosure, the first microprism is a triangular prism, and the bottom surface of the first microprism is in contact with the light guide layer; the angle between the two side surfaces of the first microprism is 60° to 120°; the second microprism is a triangular prism, and the bottom surface of the second microprism is in contact with the first substrate; the angle between the two side surfaces of the second microprism is 60° to 120°.

[0013] In some embodiments of the present disclosure, two side surfaces of the first microprism are connected by an arc surface; and / or two side surfaces of the second microprism are connected by an arc surface.

[0014] In some embodiments of the present disclosure, the composite layer further includes an anti-adsorption layer disposed on a surface of the first substrate on a side away from the light guide layer; the anti-adsorption layer has a plurality of grooves and protrusions.

[0015] In some embodiments of the present disclosure, the composite layer further includes a plurality of mesh dot structures disposed on a surface of the light guide layer on a side away from the first substrate.

[0016] In some embodiments of the present disclosure, the thickness of the composite layer is 250 μm to 600 μm.

[0017] In some embodiments of the present disclosure, the backlight module further includes a first reflective layer, and the first reflective layer is disposed on a side of the light guide layer away from the first substrate.

[0018] Another aspect of the present disclosure provides a display device, including a display panel and any one of the backlight modules described above.

[0019] In some embodiments of the present disclosure, the display panel includes an array substrate and a matching box substrate that are relatively arranged; the backlight module is located on a side of the array substrate away from the matching box substrate; the first substrate in the backlight module is close to the array substrate, and the light guide layer is away from the array substrate.

[0020] In some embodiments of the present disclosure, the display panel includes an array substrate and a matching box substrate that are relatively arranged, and a second reflective layer located on a side of the array substrate away from the matching box substrate; when the first reflective layer is not set in the backlight module, the backlight module is located on a side of the matching box substrate away from the array substrate; the first substrate in the backlight module is close to the matching box substrate, and the light guide layer is away from the array substrate.

[0021] In some embodiments of the present disclosure, a groove is provided on the first microprism at a position intersecting with the second microprism, and a portion of the second microprism is located in the groove. In a case where the number of sub-pixels arranged along the first direction in the display area of ​​the display device is less than the number of sub-pixels arranged along the vertical second direction; or, a groove is provided on the second microprism at a position intersecting with the first microprism, and a portion of the first microprism is located in the groove. In a case where the number of sub-pixels arranged along the first direction in the display area of ​​the display device is greater than the number of sub-pixels arranged along the vertical second direction.

[0022] In some embodiments of the present disclosure, the viewing angle of the display device is between 0° and ±30°; the ratio S of the depth of the groove to the height of the microprism having the groove is: 0<S≤1 / 5; wherein the depth of the groove is consistent with the direction of the height of the microprism having the groove.

[0023] In some embodiments of the present disclosure, the viewing angle of the display device is between 0° and ±60°; the ratio S of the depth of the groove to the height of the microprism having the groove is: 0<S≤3 / 5; wherein the depth of the groove is consistent with the direction of the height of the microprism having the groove.

[0024] Another aspect of the present disclosure provides a method for manufacturing a backlight module as described above, the method comprising: forming a plurality of first microprisms whose extension directions are all parallel to a first direction on a light emitting surface of a light guide layer by a patterning process; forming a plurality of second microprisms whose extension directions are all parallel to a second direction on a first substrate by a patterning process; and fixing the plurality of first microprisms to the plurality of second microprisms.

[0025] In some embodiments of the present disclosure, fixedly connecting the plurality of first microprisms with the plurality of second microprisms includes: directly contacting the first microprisms with the second microprisms, and through a curing process, making the plurality of first microprisms and the plurality of second microprisms an integrated structure.

[0026] In some embodiments of the present disclosure, fixedly connecting the plurality of first microprisms with the plurality of second microprisms includes: forming a second substrate bonded to the plurality of first microprisms on a surface of a side of the plurality of first microprisms away from the light guiding layer; and bonding a surface of a side of the second substrate away from the light guiding layer to the plurality of second microprisms.

[0027] In some embodiments of the present disclosure, the fixed connection of the plurality of first microprisms with the plurality of second microprisms includes: forming a fourth substrate bonded to the plurality of first microprisms on a side surface of the plurality of first microprisms away from the light guide layer; forming a third substrate bonded to the plurality of second microprisms on a side surface of the plurality of second microprisms away from the first substrate; and bonding a side surface of the fourth substrate substrate away from the light guide layer to a side surface of the third substrate away from the first substrate.

[0028] As can be seen from the above, in the backlight module provided by the present disclosure, the first microprism is fixedly connected to the second microprism. In addition, the bottom surface of the first microprism is in contact with the light emitting surface of the light guide layer and is fixedly connected, and the bottom surface of the second microprism is in contact with the side surface of the first substrate close to the light guide layer and is fixedly connected. In this case, adjacent components in the composite layer are fixedly connected to each other, so that the positions of the components in the composite layer can be relatively fixed. In this way, for a display device having the above-mentioned backlight module, when in use, testing or transportation, the relative displacement between the components in the composite layer is very small, thereby reducing the probability of wrinkles in the composite layer, resulting in the appearance of Newton rings, moiré patterns and other undesirable phenomena in the displayed image. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 A schematic diagram of the structure of a composite layer provided for some embodiments of the present disclosure;

[0031] Figure 2 A schematic structural diagram of a backlight module provided for some embodiments of the present disclosure;

[0032] Figure 3 A schematic structural diagram of another backlight module provided for some embodiments of the present disclosure;

[0033] Figure 4 for Figure 3 Another structural schematic diagram of the first microprism;

[0034] Figure 5 A schematic structural diagram of another backlight module provided for some embodiments of the present disclosure;

[0035] Figure 6 A schematic structural diagram of another backlight module provided for some embodiments of the present disclosure;

[0036] Figure 7 for Figure 2 A schematic diagram of a structure in which the first microprism and the second microprism are in contact;

[0037] Figure 8 A schematic structural diagram of another backlight module provided for some embodiments of the present disclosure;

[0038] Fig. 9 A schematic diagram of the structure of a display device provided for some embodiments of the present disclosure;

[0039] Fig.10 A schematic structural diagram of another display device provided for some embodiments of the present disclosure;

[0040] Fig.11 A schematic structural diagram of another display device provided for some embodiments of the present disclosure;

[0041] Fig.12 A flow chart of a method for manufacturing a backlight module provided for some embodiments of the present disclosure;

[0042] Fig.13 A process schematic diagram corresponding to a method for manufacturing a backlight module provided in some embodiments of the present disclosure.

[0043] Reference numerals:

[0044] 01-backlight module; 02-composite layer; 03-display panel; 10-light guide layer; 100-dot structure; 11-first microprism; 20-first substrate; 21-second microprism; 22-second substrate; 23-third substrate; 24-fourth substrate; 30-light source; 40-anti-adsorption layer; 41-first reflection layer; 42-second reflection layer; 50-scattering layer; 300-array substrate; 301-box substrate; 110-groove. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0046] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.

[0047] Some embodiments of the present application provide a backlight module, the backlight module comprising: Figure 1 The composite layer 02 shown includes a light guide layer 10 and a first substrate 20 that are arranged opposite to each other.

[0048] In addition, the composite layer 02 is Figure 1 As shown, it also includes a plurality of first microprisms 11 and a plurality of second microprisms 21 located between the light guide layer 10 and the first substrate 20 .

[0049] The plurality of first microprisms 11 are located on a surface of the light guide layer 10 close to the first substrate 20 , ie, a light emitting surface of the light guide layer 10 , and the extension directions of the plurality of first microprisms 11 are all parallel to the first direction H.

[0050] The plurality of second microprisms 21 are located on a surface of the first substrate 20 close to the light guide layer 10 , and the extension directions of the plurality of second microprisms 21 are all parallel to the second direction V.

[0051] Based on this, in some embodiments of the present application, a patterning process can be used on the light emitting surface of the light guide layer 10 to form the above-mentioned multiple first microprisms 11, so that the bottom surface of the first microprism 11 is in contact with the light emitting surface of the light guide layer 10 and fixedly connected.

[0052] The material constituting the light guide layer 10 can be a transparent resin material, such as polycarbonate (PC), which allows the light from the light source 30 incident on the light guide layer 10 to be totally reflected inside the light guide layer 10. The light guide layer 10 can be a plate structure with a relatively hard material or a film structure with a relatively soft material, which is not limited to this.

[0053] Similarly, a patterning process can be used on the surface of the first substrate 20 close to the light guide layer 10 to form the above-mentioned plurality of second microprisms 21, so that the bottom surface of the second microprism 21 is in contact with the surface of the first substrate 20 close to the light guide layer 10 and is fixedly connected.

[0054] The material constituting the first substrate 20 may be a transparent resin material, for example, polyethylene terephthalate (PET).

[0055] It should be noted that the planes where the first direction H and the second direction V are located are parallel to the light emitting surface of the light guide layer 10. The light emitting surface of the light guide layer 10 refers to the surface from which the light inside the light guide layer 10 is emitted.

[0056] For the convenience of explanation, in the following embodiments, the first direction H may be a horizontal direction corresponding to the horizontal viewing angle of the display panel, and the second direction V may be a longitudinal direction corresponding to the vertical viewing angle of the display panel.

[0057] In addition, the above-mentioned patterning process can be a photolithography (Mask) process, an inkjet printing process, a roll-to-roll transfer process, or other processes for forming a predetermined pattern. The above-mentioned photolithography process refers to a process for forming a pattern using a photoresist, a mask, an exposure machine, etc., including a process of film formation, exposure, and development. The corresponding patterning process can be selected according to the structure formed in the present invention.

[0058] like Figure 2 As shown, the backlight module 01 further includes a light source 30 , which is disposed on at least one side of the light guide layer 10 . Hereinafter, the side of the light guide layer 10 on which the light source 30 is disposed is referred to as a light incident surface of the light guide layer 10 .

[0059] The light beam emitted by the light source 30 is cone-shaped (the cone angle is about 120°). In this case, among the light beams incident from the light source 30 into the light guide layer 10, a portion of the light beams propagate along the first direction H, while another portion of the light beams propagate along the second direction V. The first direction H is perpendicular to the light incident surface of the light guide layer 10, and the second direction V is parallel to the light incident surface of the light guide layer 10.

[0060] In addition, if Figure 2 As shown, the composite layer 02 further includes a plurality of mesh structures 100 disposed on the non-light emitting surface of the light guide layer 10. The non-light emitting surface of the light guide layer 10 is disposed opposite to the light emitting surface of the light guide layer 10.

[0061] In this case, if Figure 2As shown, the light transmitted along the first direction H inside the light guide layer 10 can be totally reflected in the light guide layer 10. When the light transmitted along the first direction H irradiates the above-mentioned mesh dot structure 100, the mesh dot structure 100 can destroy the total reflection of the light in the light guide layer 10, so that the light is emitted from the light emitting surface of the light guide layer 10, and the light that is not incident on the mesh dot structure 100 will continue to be totally reflected in the light guide layer 10.

[0062] Based on this, the light transmitted along the first direction H in the light guide layer 10 is emitted from the light emitting surface of the light guide layer 10 under the action of the above-mentioned mesh structure 100, and then enters the second microprism 21. The second microprism 21 can converge the incident light, so that the exit angle α of the light emitted by the second microprism 21 is controlled within a certain range to improve the brightness of the light within the range. Therefore, the plurality of second microprisms 21 can converge the light transmitted along the first direction H emitted by the light guide layer 10.

[0063] In some embodiments of the present disclosure, Figure 1 As shown, the second microprism 21 is a triangular prism. Figure 1 As shown in Figure 2, the bottom surface of the second microprism 21 is in contact with the first substrate 20. The angle between the two side surfaces of the second microprism 21, hereinafter referred to as the vertex angle γ2 of the second microprism 21, is 60° to 120°. When the vertex angle γ2 of the second microprism 21 is less than 60° or greater than 120°, the exit angle α of the light emitted by the second microprism 21 is too large, so that the horizontal viewing angle (corresponding to the first direction H) of the display device is too large, resulting in that the display light emitted from the edge of the display device cannot be received by the human eye, resulting in a waste of light.

[0064] Based on this, in some embodiments of the present disclosure, for a display device whose horizontal size is smaller than its vertical size, such as a mobile phone, the horizontal viewing angle requirement is smaller. In this case, the vertex angle γ2 of the second microprism 21 can be selected to be 90°. At this time, the exit angle α of the light emitted by the second microprism 21 can be controlled to be around ±30°, so that the horizontal viewing angle has a higher brightness.

[0065] Alternatively, in some other embodiments of the present disclosure, for a display device whose horizontal dimension is larger than its vertical dimension, such as a flat-panel television, a larger horizontal viewing angle is required. In this case, the vertex angle γ2 of the second microprism 21 can be selected to be 60° or 120°, so that the display light emitted from the edge of the display device can be received by the human eye while increasing the horizontal viewing angle of the display device and improving the display effect.

[0066] In addition, the light transmitted along the second direction V in the light guiding layer 10 will not be totally reflected in the light guiding layer 10, and the incident angle of the light transmitted along the second direction V when incident on the light emitting surface of the light guiding layer 10 is small, so that most of the light transmitted along the second direction V can be emitted from the light emitting surface of the light guiding layer 10.

[0067] like Figure 3 As shown, after the light transmitted along the second direction V in the light guide layer 10 is emitted from the light emitting surface of the light guide layer 10, it is incident on the first microprism 11. The first microprism 11 can converge the incident light, so that the exit angle β of the light emitted by the first microprism 11 is controlled within a certain range to improve the brightness of the light within the range. Therefore, the plurality of first microprisms 11 can converge the light transmitted along the second direction V emitted by the light guide layer 10.

[0068] In some embodiments of the present disclosure, Figure 1 As shown, the first microprism 11 is a triangular prism. Figure 3 As shown, the bottom surface of the first microprism 11 is in contact with the light guide layer 10. The angle between the two side surfaces of the first microprism 11, hereinafter referred to as the vertex angle γ1 of the first microprism 11, is 60° to 120°. When the vertex angle γ1 of the first microprism 11 is less than 60° or greater than 120°, the exit angle β of the light emitted by the first microprism 11 is too large, so that the vertical viewing angle (corresponding to the second direction V) of the display device is too large, resulting in that the display light emitted from the edge of the display device cannot be received by the human eye, resulting in a waste of light.

[0069] Based on this, in some embodiments of the present disclosure, for a display device whose longitudinal dimension is smaller than its horizontal dimension, such as a flat-panel TV, the vertical viewing angle requirement is smaller. In this case, the vertex angle γ1 of the first microprism 11 can be selected to be 90°. At this time, the exit angle β of the light emitted by the first microprism 11 can be controlled to be around ±30°, so that the vertical viewing angle has a higher brightness.

[0070] Alternatively, in some other embodiments of the present disclosure, for a display device with a larger longitudinal dimension than a horizontal dimension, such as a mobile phone, a larger vertical viewing angle is required. In this case, the vertex angle γ1 of the first microprism 11 can be selected to be 60° or 120°, so that the display light emitted from the edge of the display device can be received by the human eye while increasing the vertical viewing angle of the display device and improving the display effect.

[0071] From the above, it can be seen that by setting the vertex angle γ1 of the first microprism 11 and the vertex angle γ2 of the second microprism 21, the display device can have a greater brightness at one viewing angle, such as a horizontal viewing angle (or a vertical viewing angle), and obtain a larger viewing angle range at another viewing angle, such as a vertical viewing angle (or a horizontal viewing angle).

[0072] In addition, when the vertex angle γ1 of the first microprism 11 is constant, in order to further increase the viewing angle range of the vertical viewing angle of the display device, as shown in FIG. Figure 4 As shown, the two side surfaces of the first microprism 11 are connected by an arc surface.

[0073] Similarly, when the vertex angle γ2 of the second microprism 21 is constant, in order to further increase the viewing angle range of the horizontal viewing angle of the display device, the two side surfaces of the second microprism 21 may also be connected by an arc surface.

[0074] On this basis, the first microprism 11 is fixedly connected to the second microprism 21. As can be seen from the above, the bottom surface of the first microprism 11 is in contact with the light-emitting surface of the light-guiding layer 10 and is fixedly connected, and the bottom surface of the second microprism 21 is in contact with the side surface of the first substrate 20 close to the light-guiding layer 10 and is fixedly connected. In this case, the adjacent components in the composite layer 02 are fixedly connected to each other, so that the positions of the components in the composite layer 02 can be relatively fixed. In this way, for a display device having the above-mentioned backlight module, the relative displacement between the components in the composite layer 02 is very small when in use, testing or transportation, thereby reducing the probability of wrinkles in the composite layer 02, resulting in Newton rings, moiré patterns and other undesirable phenomena in the displayed image.

[0075] In addition, it can be known from the above that the light guide layer 10 in the composite layer 02 can guide the light emitted by the light source 30 out of the light emitting surface of the light guide layer 10. And the first microprism 11 and the second microprism 21 in the composite layer 02 can respectively converge the light emitted in the second direction V and the first direction H guided by the light guide layer 10, thereby improving the brightness of the display screen.

[0076] Based on this, the backlight module 01 having the above-mentioned composite layer 02 does not need to be provided with structures such as an upper light guide plate, upper and lower prisms, and a diffuser. In addition, when the light guide layer 10 in the composite layer 02 is composed of a softer resin material, the light guide layer 10 can be a light guide film. In this case, the thickness of the light guide layer 10 can be 200μm. At this time, the thickness of the above-mentioned composite layer 02 is 250μm to 600μm. When the thickness of the composite layer 02 is less than 250μm, the requirements for the precision of the manufacturing process are high, which is not conducive to reducing the production cost. When the thickness of the composite layer 02 is greater than 600μm, the thickness of the backlight module 01 will be too large, which is not conducive to realizing the ultra-thin design of the display device.

[0077] The manner in which the first microprism 11 and the second microprism 21 are fixedly connected is described in detail below.

[0078] For example, in some embodiments of the present application, Figure 5As shown, the composite layer 02 further includes a second substrate 22 .

[0079] The second substrate 22 is located between the plurality of first micro-prisms 11 and the plurality of second micro-prisms 21 .

[0080] A surface of the second substrate 22 close to the first substrate 20 is connected to the plurality of second microprisms 21 , and a surface of the second substrate 22 close to the light guide layer 10 is connected to the plurality of first microprisms 11 .

[0081] In some embodiments of the present disclosure, the second substrate 22 may be a bonding layer to bond the top of the first microprism 11 to the top of the second microprism 21 .

[0082] Alternatively, in some other embodiments of the present disclosure, the second substrate 22 may also be a transparent resin film layer.

[0083] In this case, during the manufacturing process, a light guide layer 10 having a plurality of first microprisms 11 and a first substrate 20 having a plurality of second microprisms 21 can be manufactured first. Then, a glue layer is coated on a side surface (lower surface) of the second substrate 22 close to the light guide layer 10, and bonded to the top of the first microprisms 11. Next, a glue layer is coated on a side surface (upper surface) of the second substrate 22 away from the light guide layer 10, and then the tops of the plurality of second microprisms 21 are bonded to the second substrate 22. In this way, the upper and lower surfaces of the second substrate 22 can provide a larger bonding area for the second microprisms 21 and the first microprisms 11, respectively, thereby reducing the difficulty of the above bonding process.

[0084] Alternatively, the first microprism 11 and the second microprism 21 are fixedly connected in another manner, for example, in some embodiments of the present application, such as Figure 6 As shown, the composite layer 02 further includes a third substrate 23 and a fourth substrate 24 which are stacked and connected.

[0085] The third substrate 23 and the fourth substrate 24 are located between the plurality of first microprisms 11 and the plurality of second microprisms 21 .

[0086] A surface of the third substrate 23 close to the first substrate 20 is connected to the plurality of second microprisms 21 .

[0087] A surface of the fourth substrate 24 close to the light guide layer 10 is connected to the plurality of first microprisms 11 .

[0088] In some embodiments of the present disclosure, the third substrate 23 and the second substrate 24 may be transparent resin film layers. Based on this, during the manufacturing process, the light guide layer 10 having a plurality of first microprisms 11 and the first substrate 20 having a plurality of second microprisms 21 may be manufactured first.

[0089] Then, a glue layer is coated on a side surface (lower surface) of the fourth substrate 24 close to the light guide layer 10, and bonded to the top of the first microprism 11. Next, a glue layer is coated on a side surface (upper surface) of the third substrate 23 away from the light guide layer 10, and then the tops of the plurality of second microprisms 21 are bonded to the third substrate 23. In this way, the upper surface of the third substrate 23 and the lower surface of the fourth substrate 24 can provide a larger bonding area for the second microprisms 21 and the first microprisms 11, respectively, thereby reducing the difficulty of the above bonding process.

[0090] Alternatively, the first microprism 11 and the second microprism 21 are fixedly connected in another example, in some embodiments of the present application, such as Figure 2 or Figure 3 As shown, the plurality of first microprisms 11 and the plurality of second microprisms 21 are in direct contact with each other and are an integral structure.

[0091] During the manufacturing process, the first microprisms 11 can be formed on the light guide layer 10 by semi-curing process, and the second microprisms 21 can be formed on the first substrate 20. Next, the first microprisms 11 and the second microprisms 21 that are in contact with each other are connected together by full curing.

[0092] The above-mentioned curing process can be thermal curing or photocuring, which is not limited in the present disclosure.

[0093] Based on this, when the semi-cured first microprism 11 is in direct contact with the plurality of second microprisms 21, if the hardness of the first microprism 11 is different from that of the plurality of second microprisms 21, then Figure 7 As shown, a groove 110 is formed on a soft microprism, such as the first microprism 11 , and a portion of a hard microprism, such as the second microprism 21 , is located in the groove 110 and contacts the inner wall of the groove 110 .

[0094] As can be seen from the above, the second microprism 21 can converge the light emitted by the light guide layer 10 and transmitted along the first direction H (horizontal direction). In addition, for a display device whose horizontal size is smaller than the vertical size, such as a mobile phone, since the horizontal size is smaller, it is easier to increase the brightness of the entire display screen by converging the light in the horizontal direction.

[0095] In this case, the first microprism 11 is provided with the above-mentioned groove 110 at a position intersecting with the second microprism 21, and a part of the second microprism 21 is located in the groove 110. Figure 2 As shown, the top angle shape of the second microprism 21 can be completely preserved, so that the light converging effect of the second microprism 21 in the horizontal direction is not affected.

[0096] Similarly, it can be seen from the above that the first microprism 11 can converge the light emitted by the light guide layer 10 and transmitted along the second direction V (longitudinal direction). In addition, for a display device whose longitudinal dimension is smaller than the horizontal dimension, such as a flat-screen TV, since the longitudinal dimension is smaller, it is easier to converge the light in the longitudinal direction to improve the brightness of the entire display screen.

[0097] In this case, the second microprism 21 is provided with the above-mentioned groove 110 at a position intersecting with the first microprism 11, and a portion of the first microprism 11 is located in the groove 110. Figure 3 As shown, the top angle shape of the first microprism 11 can be completely preserved, so that the light converging effect of the first microprism 11 in the longitudinal direction is not affected.

[0098] In addition, the larger the contact area between the first microprism 11 and the second microprism 21, the better the scattering effect of the light, and the larger the viewing angle of the display device. For example, when the first microprism 11 and the second microprism 21 are in direct contact at the top angle, the display device has a viewing angle of 0°. Figure 7 As shown, when a groove 110 is provided on a microprism, such as the first microprism 11, and the depth H1 of the groove 110 is increased, more of the second microprism 21 is located in the groove 110, thereby increasing the contact area between the first microprism 11 and the second microprism 21, thereby achieving the purpose of increasing the viewing angle of the display device.

[0099] In this case, in some embodiments, for a display device with a higher requirement for center brightness, such as a mobile phone with a smaller horizontal size than a vertical size, the mobile phone requires a smaller viewing angle, that is, the viewing angle requirement is usually between 0° and ±30°, and the ratio of the depth of the groove 110 to the height H2 of the microprism (such as the first microprism 11) having the groove 110 is S=H1:H2; the value range of S is 0<S≤1 / 5.

[0100] When the depth H1 of the groove 110 is 1 / 5 of the height H2 of the microprism provided with the groove 110, for example, the first microprism 11, the contact depth between the first microprism 11 and the second microprism 21 is 1 / 5 of the height H2 of the first microprism 11. At this time, the viewing angle of the mobile phone can reach ±30°.

[0101] When the contact depth between the first microprism 11 and the second microprism 21 is further reduced so that the height H1 of the groove 110 is less than 1 / 5 of the height H2 of the first microprism 11 , the viewing angle of the mobile phone can reach ±10°.

[0102] The depth direction of the groove 110 is consistent with the height direction of the microprism.

[0103] In other embodiments, for a display device with lower requirements for center brightness, such as a flat-screen TV whose longitudinal dimension is smaller than its horizontal dimension, the flat-screen TV requires a larger viewing angle, that is, the viewing angle requirement is between 0° and ±60° horizontally, and the ratio S=H1:H2:S of the depth of the groove 110 and the height H2 of the microprism (e.g., the first microprism 11) having the groove 110 is in the range of 0<S≤3 / 5.

[0104] When the depth H1 of the groove 110 occupies 3 / 5 of the height H2 of the microprism provided with the groove 110, for example, the first microprism 11, the contact depth between the first microprism 11 and the second microprism 21 is 3 / 5 of the height H2 of the first microprism 11. At this time, the viewing angle of the flat-screen TV can reach ±60°.

[0105] When the contact depth between the first microprism 11 and the second microprism 21 is further reduced so that the height H1 of the groove 110 is less than 3 / 5 of the height H2 of the first microprism 11 , the viewing angle of the flat-screen TV can reach ±10°.

[0106] In addition, in some embodiments of the present disclosure, when the backlight module further includes other film layers in contact with the light-emitting surface of the composite layer 02, for example, when the other film layer is a polarizer, in order to prevent the polarizer from being adsorbed on the light-emitting surface of the composite layer 02, resulting in wrinkles on the polarizer. Figure 8 As shown, the composite layer 02 further includes an anti-adsorption layer 40 disposed on the surface of the first substrate 20 on the side away from the light guide layer 10. The anti-adsorption layer 40 has a plurality of grooves and protrusions to increase the roughness of the light-emitting surface of the composite layer 02. In this way, the grooves on the anti-adsorption layer 40 can accommodate air, thereby reducing the adsorption force between the light-emitting surface of the composite layer 02 and the polarizer or other film layers.

[0107] In addition, in some embodiments of the present disclosure, in order to improve the utilization rate of light, such as Figure 8 As shown, the backlight module 01 further includes a first reflective layer 41, which is disposed on a side of the light guide layer 10 away from the first substrate 20. Through the first reflective layer 41, light emitted from the lower surface of the light guide layer 10 can be re-emitted to the light guide layer 10, thereby reducing light loss.

[0108] Some other embodiments of the present application provide a display device, including: Fig. 9 or Fig.10 The display panel 03 shown and any one of the backlight modules 01 described above have the same technical effects as the backlight module 01 provided in the above embodiment, which will not be described in detail here.

[0109] It should be noted that the above-mentioned display device is a liquid crystal display device, which includes devices with display function such as mobile phones, televisions, and tablet computers.

[0110] The above display device can be divided into a rear-backlight type display device and a front-backlight type display device according to the different locations of the backlight module 01 in the display device. The structures of the above two types of display devices are described below.

[0111] like Fig. 9 As shown, the display device is a rear backlight type display device. The display panel 03 includes an array substrate 300 and a pairing substrate 301 that are arranged opposite to each other. A liquid crystal layer is arranged between the array substrate 300 and the pairing substrate 301. When the pairing substrate 301 includes a color filter substrate, the pairing substrate 301 can be a color filter substrate.

[0112] In addition, the backlight module 01 is located on a side of the array substrate 300 away from the box substrate 301 .

[0113] The first substrate 20 in the backlight module 01 is close to the array substrate 300 , and the light guide layer 10 is far away from the array substrate 300 .

[0114] Depend on Fig. 9 It can be seen that if the light source 30 is set in the light guide layer 10, the light in the light guide layer 10 is emitted from the light emitting surface of the light guide layer 10, and under the focusing effect of the first microprism 11 and the second microprism 21, it is incident on the array substrate 300 in the display panel 03, and is emitted after passing through the liquid crystal layer and the box substrate 301 to realize picture display.

[0115] In other embodiments of the present disclosure, a front-backlit display device is provided, such as Fig.10 or Fig.11 As shown, the display panel 03 includes an array substrate 300 and a cell substrate 301 that are arranged opposite to each other, and a second reflective layer 42 that is arranged on a side of the array substrate 300 away from the cell substrate 301 .

[0116] When the first reflective layer 41 is not provided in the backlight module 01, the backlight module 01 is located on the side of the cell substrate 301 away from the array substrate 300. In addition, the first substrate 20 in the backlight module 01 is close to the cell substrate 301, and the light guide layer 10 is away from the array substrate.

[0117] like Fig.10As shown, the light source 30 is provided in the light guide layer 10, and the light in the light guide layer 10 is emitted from the light emitting surface of the light guide layer 10, and is incident on the cell substrate 301 in the display panel 03 under the focusing effect of the first microprism 11 and the second microprism 21, and then passes through the liquid crystal layer and the array substrate 300, and then the second reflective layer 42 is provided. Next, under the reflection effect of the second reflective layer 42, the light passes through the display panel 03 and the backlight module 01 again for display.

[0118] In order to ensure that all parts of the display panel 03 can evenly receive the light emitted by the backlight module 01, Fig.10 As shown, the backlight module 01 further includes a scattering layer 50 disposed on a side of the first substrate 20 away from the light guide layer 10. The scattering layer 50 can scatter the light that is disposed on the display panel 03.

[0119] Alternatively, you can Fig.11 As shown, the scattering layer 50 is removed, and the roughness of the anti-adsorption layer 40 on the surface of the first substrate 20 away from the light guide layer 10 is increased, so as to scatter the light incident to the display panel 03 through the anti-adsorption layer 40 .

[0120] As can be seen from the above, the rear-backlit display device is provided with a structure for scattering the light incident on the display panel 03, thereby weakening the light convergence effect of the first microprism 11 and the second microprism 21. Therefore, the rear-backlit display device can be used to prepare a display device such as a liquid crystal display device in a weak light environment, such as a watch with a display function, etc. These display devices have low requirements for display quality effects, and can display effective information such as time or date in weak ambient light.

[0121] In addition, it can be seen from the above that since the second microprism 21 can converge the light emitted by the light guide layer 10 and transmitted along the first direction H (horizontal direction), in order to ensure that the convergence effect of the second microprism 21 on the light in the horizontal direction is not affected, the first microprism 11 is provided with the above-mentioned groove 110 at the position where it intersects with the second microprism 21, and a part of the second microprism 21 is located in the groove 110, so that the top angle shape of the second microprism 21 can be completely retained.

[0122] Based on this, for a display device whose horizontal size is smaller than its vertical size, such as a mobile phone, since the horizontal size is smaller, it is easier to improve the brightness of the entire display screen by converging the light in the horizontal direction. Therefore, the above-mentioned arrangement method of retaining the vertex shape of the second microprism 21 is more suitable for a display device whose horizontal size is smaller than its vertical size, that is, in the display area of ​​the display device, the number of sub-pixels arranged along the first direction H is less than the number of sub-pixels arranged along the second vertical direction V.

[0123] Alternatively, it can be seen from the above that the first microprism 11 is able to converge the light emitted by the light-guiding layer 10 and transmitted along the second direction V (longitudinal direction). Therefore, in order to ensure that the convergence effect of the first microprism 11 on the light in the longitudinal direction is not affected, the second microprism 21 is provided with the above-mentioned groove 110 at a position intersecting with the first microprism 11, and a portion of the first microprism 11 is located in the groove 110, so that the top angle shape of the first microprism 11 can be completely retained.

[0124] Based on this, for a display device whose longitudinal dimension is smaller than its horizontal dimension, such as a flat-panel TV, since the longitudinal dimension is smaller, it is easier to improve the brightness of the entire display screen by converging the light in the longitudinal direction. Therefore, the above-mentioned arrangement method of retaining the vertex shape of the first microprism 11 is more suitable for a display device whose longitudinal dimension is smaller than its horizontal dimension, that is, in the display area of ​​the display device, the number of sub-pixels arranged along the first direction H is greater than the number of sub-pixels arranged along the second vertical direction V.

[0125] Some embodiments of the present application provide a method for manufacturing a backlight module, such as Fig.12 As shown, the method includes S101 to S103.

[0126] S101 , forming a plurality of first microprisms 11 whose extending directions are parallel to a first direction H on a light emitting surface of the light guide layer 10 by a patterning process.

[0127] For example, Fig.13 As shown, a light-guiding film having a dot structure 100 is rolled up on a reel 1. The light-guiding film is cut to form the light-guiding layer 10.

[0128] It should be noted that, in some other embodiments of the present disclosure, the above-mentioned dot structure 100 can be manufactured after the first micro-prism 11 and the second micro-prism 21 are manufactured.

[0129] After the light guide film is unfolded, the plurality of first micro prisms 11 are transferred to a surface of the light guide film on which the mesh structure 100 is not provided by a roll coating process, and then the plurality of first micro prisms 11 are semi-cured.

[0130] S102 , forming a plurality of second microprisms 21 on the first substrate 20 by a patterning process, wherein the plurality of second microprisms 21 have extension directions parallel to the second direction V.

[0131] For example, Fig.13 As shown, a resin film having an anti-adsorption layer 40 is wound on a reel 2. The resin film is cut to form the first substrate 20.

[0132] It should be noted that, in some other embodiments of the present disclosure, the anti-adsorption layer 40 can be manufactured after the first microprism 11 and the second microprism 21 are manufactured.

[0133] After the resin film is unfolded, the plurality of second microprisms 21 are transferred to the surface of the resin film on the side where the anti-adsorption layer 40 is not provided by a roll coating process, and then the plurality of second microprisms 21 are semi-cured.

[0134] S103 , fixing and connecting the plurality of first micro-prisms 11 and the plurality of second micro-prisms 21 .

[0135] For example, Fig.13 As shown, the light-guiding film having the first microprisms 11 and the resin film having the second microprisms 21 are arranged relative to each other through the reels 3 and 4, and then the tops of the first microprisms 11 and the second microprisms 21 are directly contacted, and are fully cured, so that the multiple first microprisms 11 and the multiple second microprisms 21 are an integrated structure.

[0136] Next, a protective film is attached to the surface of the light guide film away from the first microprism 11 and the surface of the resin film away from the second microprism 21 , and rolled up by a reel 5 to be cut during subsequent manufacturing and assembly of the backlight module 01 .

[0137] Alternatively, the above S103 may include:

[0138] First, a second substrate 22 bonded to the first microprisms 11 is formed on a surface of the first microprisms 11 that is away from the light guide layer 10 .

[0139] Then, a surface of the second substrate 22 that is away from the light guide layer 10 is bonded to the plurality of second microprisms 21 .

[0140] In this way, the upper and lower surfaces of the second substrate 22 can provide larger bonding areas for the second microprisms 21 and the first microprisms 11 , respectively, thereby reducing the difficulty of the above bonding process.

[0141] Alternatively, the above S103 may include:

[0142] First, a fourth substrate 24 bonded to the plurality of first microprisms 11 is formed on a surface of the plurality of first microprisms 11 that is away from the light guide layer 10 .

[0143] A third substrate 23 bonded to the plurality of second microprisms 21 is formed on a surface of the plurality of second microprisms 21 away from the first substrate 20;

[0144] Next, a surface of the fourth substrate 24 away from the light guide layer 10 is bonded to a surface of the third substrate 23 away from the first substrate 20 .

[0145] In this way, the upper surface of the third substrate 23 and the lower surface of the fourth substrate 24 can provide a larger bonding area for the second microprisms 21 and the first microprisms 11, respectively, thereby reducing the difficulty of the above bonding process.

[0146] The above manufacturing method has the same technical effect as the backlight module provided by the aforementioned embodiment, and will not be described in detail here.

[0147] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A backlight module, characterized in that: The backlight module comprises a composite layer, wherein the composite layer comprises a light guide layer and a first substrate which are arranged opposite to each other, and a plurality of first micro prisms and a plurality of second micro prisms which are located between the light guide layer and the first substrate; The light guide layer comprises a light emitting surface; The plurality of first microprisms are located on a surface of the light guide layer close to the first substrate, and the bottom surfaces of the plurality of first microprisms are in contact with the light emitting surface of the light guide layer; the extension directions of the plurality of first microprisms are parallel to the first direction; The plurality of second microprisms are located on a surface of the first substrate close to the light guide layer, and the bottom surfaces of the plurality of second microprisms are in contact with a surface of the first substrate close to the light guide layer; The extension directions of the plurality of second micro-prisms are all parallel to the second direction; The first microprism is fixedly connected to the second microprism; The first direction intersects with the second direction, and a plane where the first direction and the second direction are located is parallel to a light emitting surface of the light guide layer.

2. The backlight module according to claim 1, characterized in that: The composite layer also includes a second substrate; The second substrate is located between the plurality of first microprisms and the plurality of second microprisms; A surface of the second substrate on one side close to the first substrate is connected to the plurality of second microprisms, and a surface of the second substrate on one side close to the light guide layer is connected to the plurality of first microprisms.

3. The backlight module according to claim 1, characterized in that: The composite layer further comprises a third substrate and a fourth substrate which are stacked and connected; the third substrate and the fourth substrate are located between the plurality of first microprisms and the plurality of second microprisms; A surface of the third substrate close to the first substrate is connected to the plurality of second microprisms; A surface of the fourth substrate close to the light guide layer is connected to the plurality of first microprisms.

4. The backlight module according to claim 1, characterized in that: The plurality of first micro-prisms are in direct contact with the plurality of second micro-prisms and are an integrated structure.

5. The backlight module according to claim 1, characterized in that: A groove is provided on the first microprism at a position intersecting with the second microprism, and a portion of the second microprism is located in the groove; Alternatively, a groove is provided on the second microprism at a position intersecting with the first microprism, and a portion of the first microprism is located in the groove.

6. The backlight module according to claim 1, characterized in that: The first microprism is a triangular prism, and the bottom surface of the first microprism is in contact with the light guide layer; the angle between the two side surfaces of the first microprism is 60° to 120°; The second microprism is a triangular prism, and the bottom surface of the second microprism is in contact with the first substrate; the angle between the two side surfaces of the second microprism is 60° to 120°.

7. The backlight module according to claim 6, characterized in that: The two side surfaces of the first microprism are connected via an arc surface; and / or the two side surfaces of the second microprism are connected via an arc surface.

8. The backlight module according to claim 1, characterized in that: The composite layer further includes a plurality of mesh dot structures arranged on a surface of the light guide layer on a side away from the first substrate.

9. The backlight module according to claim 1, characterized in that: The thickness of the composite layer is 250 μm to 600 μm.

10. The backlight module according to claim 1, characterized in that: The backlight module further includes a first reflective layer, which is disposed on a side of the light guide layer away from the first substrate.

11. A display device, characterized in that: It comprises a display panel and a backlight module as claimed in any one of claims 1 to 10.

12. The display device according to claim 11, characterized in that: The display panel comprises an array substrate and a pairing substrate which are arranged opposite to each other; the backlight module is located on a side of the array substrate away from the pairing substrate; The first substrate in the backlight module is close to the array substrate, and the light guide layer is far away from the array substrate.

13. The display device according to claim 11, characterized in that The display panel comprises an array substrate and a cell-matching substrate which are arranged opposite to each other, and a second reflective layer which is located at a side of the array substrate away from the cell-matching substrate; In the case where the first reflective layer is not provided in the backlight module, the backlight module is located on a side of the cell substrate away from the array substrate; The first substrate in the backlight module is close to the cell-matching substrate, and the light-guiding layer is far away from the array substrate.

14. The display device according to claim 11, characterized in that: A groove is provided on the first microprism at a position intersecting with the second microprism, and when a portion of the second microprism is located in the groove, in a display area of ​​the display device, the number of sub-pixels arranged along the first direction is less than the number of sub-pixels arranged along the second vertical direction; Alternatively, a groove is provided on the second microprism at a position intersecting with the first microprism, and a portion of the first microprism is located in the groove. In this case, in the display area of ​​the display device, the number of sub-pixels arranged along the first direction is greater than the number of sub-pixels arranged along the vertical second direction.

15. The display device according to claim 14, characterized in that: The viewing angle of the display device is between 0° and ±30°; The ratio S of the depth of the groove to the height of the microprism having the groove is: 0<S≤1 / 5; The depth of the groove is consistent with the height of the microprism having the groove.

16. The display device according to claim 14, characterized in that: The viewing angle of the display device is between 0° and ±60°; The ratio S of the depth of the groove to the height of the microprism having the groove is: 0<S≤3 / 5; The depth of the groove is consistent with the height of the microprism having the groove.

Images