Backlight module and backlight module preparation method

Abstract

The invention provides a backlight module and a backlight module preparation method. The backlight module comprises a back plate, a reflecting layer, a light bar and a light absorption structure, the back plate comprises a bottom surface and side surfaces surrounding the bottom surface and connected with the edge of the bottom surface, the light bar is located on the bottom surface of the back plate and connected with the back plate, and the reflecting layer covers the bottom surface and the side surfaces of the back plate; the light absorption structure is at least located on the reflecting layer on the bottom face of the back plate and comprises a plurality of light absorption patterns, and the areas of the light absorption patterns are gradually reduced in the direction away from the light bar.

Description

Technical Field

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

[0002] The backlight module is a device that provides light source in a display device.

[0003] The related art provides a backlight module, which includes a back plate, a reflective layer and a light bar. The reflective layer is located on the back plate, and the light bar passes through the reflective layer and is electrically connected to the back plate.

[0004] However, the backlight module with the above structure has the problem of uneven light emission. Summary of the Invention

[0005] The embodiments of the present disclosure provide a backlight module and a method for manufacturing the backlight module, which can reduce process complexity and make the backlight module emit light uniformly. The technical solution is as follows:

[0006] In one aspect, a backlight module is provided, comprising:

[0007] Back panel, reflective layer, light strip and light absorbing structure;

[0008] The back panel includes a bottom surface and a side surface surrounding the bottom surface and connected to the edge of the bottom surface; the light bar is located on the bottom surface of the back panel and connected to the back panel; the reflective layer covers the bottom surface and side surface of the back panel;

[0009] The light absorption structure is at least located on the reflective layer on the bottom surface of the back plate. The light absorption structure includes a plurality of light absorption patterns. The areas of the plurality of light absorption patterns gradually decrease in a direction away from the light bar.

[0010] Optionally, the back plate includes a rectangular bottom surface and four side surfaces connected to the bottom surface;

[0011] The two ends of the light bar face the two opposite sides respectively.

[0012] The light absorption structure is located on the bottom surface of the back plate and the two side surfaces of the reflective layer facing the two ends of the light bar.

[0013] Optionally, the light absorption pattern is circular;

[0014] The plurality of light absorption patterns are arranged in rows, and each row is arranged at equal intervals.

[0015] Optionally, in the same row, the distance between two adjacent light absorption patterns is 5-8 mm.

[0016] Optionally, in the light absorbing structure,

[0017] The diameter of the light absorption pattern in the nth row close to the light bar is 4-0.5×(n-1) to 6-0.5(n-1) mm;

[0018] n is an integer greater than or equal to 1.

[0019] Optionally, the light bar comprises: a plurality of light emitting devices and a plurality of lenses;

[0020] The distance between adjacent light-emitting devices among the plurality of light-emitting devices is smaller than the distance between the light-emitting devices and the reflective layer on the side surface of the back plate;

[0021] The plurality of lenses respectively cover the plurality of light-emitting devices;

[0022] The lens is used to change the light output angle of the light emitting device so that the light output angle of the light emitting device in the y direction is greater than the light output angle in the x direction. The x direction is the length direction of the light device, and the y direction is a direction perpendicular to the x direction.

[0023] In another aspect, a method for preparing a backlight module is provided, the method comprising:

[0024] Making a backboard, the backboard comprising a bottom surface and a side surface surrounding the bottom surface and connected to an edge of the bottom surface;

[0025] Making a light bar, wherein the light bar is located on the bottom surface of the back plate and connected to the back plate;

[0026] Making a reflective layer, wherein the reflective layer covers the bottom surface and side surfaces of the back plate;

[0027] A light absorption structure is manufactured. The light absorption structure is located on the reflective layer on the bottom and side surfaces of the back panel. The light absorption structure includes a plurality of light absorption patterns. The areas of the plurality of light absorption patterns gradually decrease in a direction away from the light bar.

[0028] Optionally, the back plate includes a rectangular bottom surface and four side surfaces connected to the bottom surface;

[0029] The two ends of the light bar face the two opposite sides respectively.

[0030] The light absorption structure is located on the bottom surface of the back plate and the two side surfaces of the reflective layer facing the two ends of the light bar.

[0031] Optionally, the light absorption pattern is circular;

[0032] The plurality of light absorption patterns are arranged in rows, and each row is arranged at equal intervals.

[0033] Optionally, in the same row, the distance between two adjacent light absorption patterns is 5-8 mm.

[0034] The technical solutions provided by the embodiments of the present disclosure have the following beneficial effects:

[0035] In the disclosed embodiment, a backlight module is disposed on the bottom surface of a backplane, and a reflective layer is disposed on the bottom and side surfaces of the backplane. A light-absorbing structure is disposed on the reflective layer. The light-absorbing structure comprises multiple light-absorbing patterns, the areas of which gradually decrease as the area moves away from the light bar. Because light intensity increases as the light approaches the light bar, the light-absorbing structure design ensures that light-absorbing patterns closer to the light bar absorb more light, while light-absorbing patterns farther away from the light bar absorb less light, thereby achieving more uniform brightness of the backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0037] Figure 1 1 is a structural diagram of a backlight module provided by an embodiment of the present disclosure;

[0038] Figure 2 1 is a structural diagram of a backlight module provided by an embodiment of the present disclosure;

[0039] Figure 3 is a schematic structural diagram of a light bar provided by an embodiment of the present disclosure;

[0040] Figure 4 is a structural diagram of a lens provided by an embodiment of the present disclosure;

[0041] Figure 5 is a top view of a light emitting device provided by an embodiment of the present disclosure;

[0042] Figure 6 is a structural diagram of a backlight module provided by an embodiment of the present disclosure;

[0043] Figure 7 This is a flow chart of a method for preparing a backlight module provided by an embodiment of the present disclosure;

[0044] Figure 8 This is a flow chart of another method for preparing a backlight module provided in an embodiment of the present disclosure.

[0045] The reference numerals are as follows:

[0046] 101: back panel; 102: reflective layer; 103: light bar; 104: light absorbing structure; 105: diffuser;

[0047] 201: substrate; 202: light emitting device; 203: blackened layer; 204: lens;

[0048] 301: bracket; 302: light-emitting diode chip; 303: fluorescent layer;

[0049] 1041: Light-absorbing pattern. DETAILED DESCRIPTION

[0050] In order to make the objectives, technical solutions and advantages of the present disclosure more clear, the embodiments of the present disclosure will be further described in detail below with reference to the accompanying drawings.

[0051] Figure 1 Schematic diagram of the structure of a backlight module provided by an embodiment of the present disclosure. Figure 1 , the backlight module includes:

[0052] Back plate 101 , reflective layer 102 , light bar 103 and light absorbing structure 104 .

[0053] The back panel 101 includes a bottom surface and side surfaces surrounding the bottom surface and connected to the edge of the bottom surface. The light bar 103 is located on the bottom surface of the back panel 101 and connected to the back panel 101. The reflective layer 102 covers the bottom and side surfaces of the back panel 101.

[0054] The light absorption structure 104 is located on the reflective layer 102 on the bottom surface of the back plate 101 . The light absorption structure 104 includes a plurality of light absorption patterns 1041 . The areas of the plurality of light absorption patterns 1041 gradually decrease in a direction away from the light bar 103 .

[0055] In the disclosed embodiment, a backlight module is disposed on the bottom surface of a backplane, and a reflective layer is disposed on the bottom and side surfaces of the backplane. A light-absorbing structure is disposed on the reflective layer. The light-absorbing structure comprises multiple light-absorbing patterns, the areas of which gradually decrease as the area moves away from the light bar. Because light intensity increases as the light approaches the light bar, the light-absorbing structure design ensures that light-absorbing patterns closer to the light bar absorb more light, while light-absorbing patterns farther away from the light bar absorb less light, thereby achieving more uniform brightness of the backlight module.

[0056] In the embodiment of the present disclosure, the light absorption structure 104 may be a film layer attached to the reflective layer.

[0057] For example, the light absorbing structure 104 may be a graphite layer, a carbon fiber layer, or a carbon black ink layer.

[0058] In this implementation, the above-mentioned materials used in the light-absorbing structure are all black light-absorbing materials, which can absorb the light from the light bar and make the brightness of the backlight module more uniform.

[0059] Exemplarily, the light absorption structure 104 is a graphite layer, and each light absorption pattern is an ink dot.

[0060] In this implementation, the light absorption structure 104 can be formed by silk screen printing or other methods.

[0061] In other embodiments, the light absorption structure 104 may be a structure formed by openings in the reflective layer 102 , and each light absorption pattern is also a through hole.

[0062] In the embodiment of the present disclosure, the back plate 101 includes a rectangular bottom surface and four side surfaces connected to the bottom surface.

[0063] The two ends of the light bar 103 face the two opposite side surfaces respectively, and the light absorption structure 104 is located on the bottom surface of the back plate 101 and the reflective layer 102 on the two side surfaces facing the two ends of the light bar 103 .

[0064] In this implementation, since the light is strongest near the light bar, the light-absorbing structure is arranged in the above manner, surrounding the light bar. This allows the light-absorbing structure to absorb the light from the stronger part of the light bar, making the brightness of the backlight module more uniform.

[0065] In other embodiments, the back plate 101 may further include a circular bottom surface and a side surface connected to the bottom surface.

[0066] In the embodiment of the present disclosure, the light absorption pattern 1041 is circular.

[0067] The plurality of light absorption patterns 1041 are arranged in rows, and each row is arranged at equal intervals.

[0068] In this implementation, a circular light-absorbing pattern is used for ease of production; arranging the light strips equidistantly in rows allows the light-absorbing structure to absorb the light more evenly, making the brightness of the backlight module more uniform.

[0069] In other embodiments, the light absorption pattern 1041 may also be a rectangle or other light absorption patterns.

[0070] In other embodiments, the plurality of light absorption patterns 1041 may be arranged in columns or irregularly.

[0071] In the embodiment of the present disclosure, in the same row, the distance between two adjacent light absorption patterns 1041 may be 5-8 mm.

[0072] In this implementation, the two adjacent light absorption patterns adopt the above distance, which can ensure the brightness of the backlight module while making the light of the backlight module more uniform.

[0073] Exemplarily, the distance between two adjacent light absorption patterns 1041 is 6 mm.

[0074] In the embodiment of the present disclosure, in the light absorption structure 104 , the diameter of the n-th row of light absorption patterns 1041 close to the light bar 103 may be 4-0.5×(n-1) to 6-0.5(n-1) mm;

[0075] n is an integer greater than or equal to 1.

[0076] In this implementation, the diameter of the light absorption pattern in the light absorption structure is calculated using the above formula. The calculated diameter can ensure the brightness of the backlight module while making the light of the backlight module more uniform.

[0077] For example, in the light absorption structure 104 , the diameter of the first row of light absorption patterns 1041 close to the light bar 103 is 4 to 6 mm; the diameter of the second row of light absorption patterns 1041 close to the light bar 103 is 3.5 to 5.5 mm, and so on.

[0078] Figure 2 Schematic diagram of the structure of a backlight module provided by an embodiment of the present disclosure. Figure 2 The light absorption pattern 1041 includes a circle, a rectangle and a trapezoid.

[0079] In the embodiment of the present disclosure, the light absorption structure 104 on the reflective layer 102 on the bottom surface of the back plate 101 is circular, and the light absorption structures on the two opposite sides of the light bar 103 are composed of circular, rectangular and trapezoidal shapes.

[0080] The two side light absorption structures 104 have a trapezoidal shape located in the middle of the first row of circles.

[0081] The rectangles in the two side light absorption structures 104 are located in the second and third rows. The second row is entirely rectangular, and the third row has a circle at each end and is entirely rectangular in the middle.

[0082] In the embodiment of the present disclosure, the upper base of the trapezoid is 17-19 nm, the lower base is 25-27 nm, and the height is 4-6 nm.

[0083] Exemplarily, the upper base of the trapezoid is 17 nm, the lower base is 25 nm, and the height is 4 nm.

[0084] In the embodiment of the present disclosure, the length of the rectangle is 5 to 7 nm, and the width is 4 to 6 nm.

[0085] Exemplarily, the length of the rectangle is 5 nm and the width is 4 nm.

[0086] In the embodiment of the present disclosure, the back plate 101 may be a metal back plate, for example, a metal back plate that can be stamped by a punch die.

[0087] In other embodiments, the back plate 101 may also be a plastic back plate or a ceramic back plate.

[0088] In the embodiment of the present disclosure, the reflective layer 102 may be a mixed layer of titanium dioxide and barium sulfate.

[0089] Optionally, the backlight module may further include a protective layer 106. The protective layer 106 may be made of PMMA, polybutyl methacrylate (PBMA), or nylon. The protective layer can effectively protect the reflective layer from falling off or being scratched.

[0090] In other examples, the reflective layer 102 may also only cover the bottom surface of the back plate 101 without covering the side surfaces, thereby reducing the assembly process and improving the operation efficiency and optical effect.

[0091] Figure 3 Schematic diagram of the structure of the light bar provided by the embodiment of the present disclosure. Figure 3 The light bar 103 includes: a plurality of light emitting devices 202 and a plurality of lenses 204 .

[0092] The distance between adjacent light emitting devices 202 among the plurality of light emitting devices 202 is smaller than the distance between the light emitting device 202 and the reflective layer 102 on the side surface of the back plate 101 .

[0093] The plurality of lenses 204 respectively cover the plurality of light emitting devices 202 .

[0094] The lens 204 is used to change the light emission angle of the light emitting device 202 so that the light emission angle of the light emitting device 202 in the y direction is greater than the light emission angle in the x direction. The x direction is the length direction of the light emitting device 202, and the y direction is a direction perpendicular to the x direction.

[0095] The light output angle is the angle of the light beam. The larger the light beam angle, the larger the light output area and the more dispersed the light is. The smaller the light output angle, the smaller the light output area and the more concentrated the light is.

[0096] In this implementation, the above-mentioned light emission method can make the light energy in the y direction of the light emitting surface of the light emitting device radiate on the side wall of the reflector, and the light energy in the x direction of the light emitting surface of the light emitting device radiate on the adjacent light emitting devices, making the light emission more uniform.

[0097] Figure 4 is a structural diagram of a lens provided by an embodiment of the present disclosure. Figure 4 , the lens 204 is elliptical.

[0098] In this implementation, the elliptical shape of the lens can make the angular radiation in the long side direction of the lens larger, and can make the light emitting angle of the light emitting device in the y direction larger than the light emitting angle in the x direction.

[0099] In other embodiments, the lens 204 may also be in other shapes, such as a circle.

[0100] In the embodiment of the present disclosure, the lens 204 may be a K9 glass, sapphire or polymethyl methacrylate (PMMA) lens.

[0101] In this implementation, the lens is made of the above-mentioned material, which can refract the light and change its path while allowing the light to pass through.

[0102] Illustratively, the lens 204 is a sapphire lens.

[0103] In the embodiment of the present disclosure, the size of the lens 204 is larger than the size of the light emitting device 202 .

[0104] In other embodiments, the size of the lens 204 may also be equal to the size of the light emitting device 202 .

[0105] In the embodiment of the present disclosure, the light bar 103 further includes: a substrate 201 and a blackened layer 203 .

[0106] A plurality of light-emitting devices 202 are disposed on a substrate 201 , a blackened layer 203 covers the substrate 201 , and a plurality of lenses 204 are disposed corresponding to the plurality of light-emitting devices 202 .

[0107] In the embodiment of the present disclosure, the substrate 201 may be an aluminum substrate.

[0108] In the embodiment of the present disclosure, the blackened layer 203 may be a graphite layer, a carbon fiber layer, or a carbon black ink layer.

[0109] In this implementation, the above materials are all black light-absorbing materials, which can absorb the light from the light bar and make the brightness of the backlight module more uniform.

[0110] Exemplarily, the blackened layer 203 is a graphite layer.

[0111] Figure 5 is a top view of the light emitting device provided by the embodiment of the present disclosure. Figure 5 The light emitting device 202 includes a bracket 301 , a light emitting diode chip 302 and a fluorescent layer 303 .

[0112] The LED chip 302 is located on the bracket 301 and is electrically connected to the bracket 301 . The fluorescent layer 303 is located in the bracket 301 and covers the LED chip 302 . The bracket 301 is connected to the substrate 201 .

[0113] In the disclosed embodiment, the material of the bracket 301 can be made of composite polymer materials such as polyphthalamide (PPA), polycyclohexylene dimethylene terephthalate (PCT), epoxy molding compound (EMC) and sheet molding compound (SMC).

[0114] Exemplarily, the material of the bracket 301 is PPA.

[0115] In the embodiment of the present disclosure, the shape of the bracket 301 is a circular bowl.

[0116] In other embodiments, the shape of the bracket 301 may also be rectangular or other shapes.

[0117] In the embodiment of the present disclosure, the LED chip 302 may be a flip-chip LED chip of 48 mil×48 mil or 49 mil×49 mil.

[0118] In other embodiments, the LED chip 302 may also be a flip-chip LED chip of other sizes.

[0119] In the embodiment of the present disclosure, the fluorescent layer 303 may be a mixture of fluorescent powder and silica gel.

[0120] In the embodiment of the present disclosure, the backlight module may be a direct-lit backlight module.

[0121] Figure 6 This is a structural diagram of a backlight module provided by an embodiment of the present disclosure. Figure 6 When the backlight module is a direct-lit backlight module, the backlight module may further include a diffusion plate 105 .

[0122] The light emitting device 202 is located between the diffuser plate 105 and the back plate 101 .

[0123] The direct-down structure described above does not have a light guide plate, thereby reducing energy loss during light refraction.

[0124] In the embodiment of the present disclosure, the material of the diffusion plate 105 can be a diffusion plate made of silicone, epoxy resin, acrylic, etc.

[0125] Exemplarily, the material of the diffusion plate 105 is silica gel.

[0126] Figure 7 This is a flow chart of a method for preparing a backlight module provided by an embodiment of the present disclosure. Figure 7, the method steps include:

[0127] S11. Make a backboard, wherein the backboard includes a bottom surface and side surfaces surrounding the bottom surface and connected to edges of the bottom surface.

[0128] S12: Making a light bar, wherein the light bar is located on the bottom surface of the back plate and connected to the back plate.

[0129] S13, making a reflective layer, wherein the reflective layer covers the bottom surface and side surfaces of the back plate.

[0130] S14. Make a light absorption structure, where the light absorption structure is located on the reflective layer on the bottom and side surfaces of the back panel. The light absorption structure includes a plurality of light absorption patterns, and the areas of the plurality of light absorption patterns gradually decrease in a direction away from the light bar.

[0131] In the disclosed embodiment, a backlight module is disposed on the bottom surface of a backplane, and a reflective layer is disposed on the bottom and side surfaces of the backplane. A light-absorbing structure is disposed on the reflective layer. The light-absorbing structure comprises multiple light-absorbing patterns, the areas of which gradually decrease as the area moves away from the light bar. Because light intensity increases as the light approaches the light bar, the light-absorbing structure design ensures that light-absorbing patterns closer to the light bar absorb more light, while light-absorbing patterns farther away from the light bar absorb less light, thereby achieving more uniform brightness of the backlight module.

[0132] Figure 8 This is a flow chart of another method for preparing a backlight module provided by an embodiment of the present disclosure. Figure 8 , the method steps include:

[0133] S21. Manufacture a back panel, the back panel comprising a bottom surface and side surfaces surrounding the bottom surface and connected to edges of the bottom surface.

[0134] In the embodiment of the present disclosure, the back plate may be a metal back plate.

[0135] In other embodiments, the back plate may also be a plastic back plate or a ceramic back plate.

[0136] Exemplarily, step S21 may include:

[0137] In the first step, a metal back plate is formed by using a metal substrate through die stamping.

[0138] The second step is to clean the stamped metal back panel.

[0139] The third step is to spray a layer of black paint on the back of the cleaned metal back panel.

[0140] S22. Produce a light-emitting device.

[0141] Exemplarily, step S22 may include:

[0142] The first step is to provide a bracket.

[0143] In the embodiment of the present disclosure, the material of the bracket can be made of composite polymer materials such as PPA, PCT, EMC and SMC.

[0144] Exemplarily, the material of the stent is PPA.

[0145] In the disclosed embodiment, the bracket is shaped like a circular bowl.

[0146] In other embodiments, the shape of the bracket may also be rectangular or other shapes.

[0147] The second step is to make the light-emitting diode chip and the bracket electrically conductive by bonding the crystal.

[0148] In the embodiment of the present disclosure, the light emitting diode chip may be a flip-chip light emitting diode chip of 48 mil×48 mil or 49 mil×49 mil.

[0149] In other embodiments, the LED chip may also be a flip-chip LED chip of other sizes.

[0150] In the embodiment of the present disclosure, the die bonding includes applying solder paste or silver glue to the die bonding position of the bracket. The solder paste or silver glue can also be printed at the die bonding position using a steel screen printing method. A die bonding machine is used to fix the light-emitting diode chip to the bracket, and the chip is cured after passing through a multi-stage reflow tunnel furnace to form electrical conduction between the chip electrode and the bracket.

[0151] In the disclosed embodiment, the melting point of the solder paste is 240-250°C.

[0152] The third step is to make a fluorescent layer, which is located inside the bracket and covers the light-emitting diode chip.

[0153] In the embodiment of the present disclosure, the fluorescent layer is prepared by mixing fluorescent powder and silica gel in a certain proportion, then using a dispensing machine to dispense the mixture on the bracket, and then baking and curing the mixture.

[0154] S23. Make light strips.

[0155] Exemplarily, step S23 may include:

[0156] The first step is to provide a substrate and fix the substrate to the backplane.

[0157] In the embodiment of the present disclosure, the substrate may be an aluminum substrate.

[0158] The second step is to print solder paste on the substrate pads.

[0159] The third step is to fix the light emitting device on the substrate.

[0160] In the embodiment of the present disclosure, the light emitting device is fixed on the substrate by reflow soldering to form electrical conduction.

[0161] Step 4: Make the lens.

[0162] In the disclosed embodiment, manufacturing the lens includes applying epoxy resin glue on the substrate, mounting the lens, and baking and curing.

[0163] In the disclosed embodiment, the lens is elliptical.

[0164] In this implementation, the elliptical shape of the lens can make the angular radiation in the long side direction of the lens larger, and can make the light emitting angle of the light emitting device in the y direction larger than the light emitting angle in the x direction.

[0165] In other embodiments, the lens may also be in other shapes, such as a circle.

[0166] In the embodiment of the present disclosure, the lens may be a K9 glass, sapphire or PMMA lens.

[0167] In this implementation, the lens is made of the above-mentioned material, which can refract the light and change its path while allowing the light to pass through.

[0168] Exemplarily, the lens is a sapphire lens.

[0169] In the embodiment of the present disclosure, the lens is used to change the light output angle of the light emitting device so that the light output angle of the light emitting device in the y direction is greater than the light output angle in the x direction. The x direction is the length direction of the light device 202, and the y direction is a direction perpendicular to the x direction.

[0170] The light output angle is the angle of the light beam. The larger the light beam angle, the larger the light output area and the more dispersed the light is. The smaller the light output angle, the smaller the light output area and the more concentrated the light is.

[0171] In this implementation, the above-mentioned light emission method can make the light energy in the y direction of the light emitting surface of the light emitting device radiate on the side wall of the reflector, and the light energy in the x direction of the light emitting surface of the light emitting device radiate on the adjacent light emitting devices, making the light emission more uniform.

[0172] In the embodiment of the present disclosure, the size of the lens is larger than the size of the light emitting device.

[0173] In other embodiments, the size of the lens may also be equal to the size of the light emitting device.

[0174] Step 5: Make the blackened layer.

[0175] In the embodiment of the present disclosure, the blackened layer may be a graphite layer, a carbon fiber layer or a carbon black ink layer.

[0176] In this implementation, the above materials are all black light-absorbing materials, which can absorb the light from the light bar and make the brightness of the backlight module more uniform.

[0177] Exemplarily, the blackened layer is a graphite layer.

[0178] S24. Make a reflective layer on the back panel.

[0179] In the embodiment of the present disclosure, the reflective layer may be a mixed layer of titanium dioxide and barium sulfate.

[0180] In other examples, the reflective layer may only cover the horizontal surface of the backplane, thereby reducing assembly steps and improving operation efficiency and optical effects.

[0181] Optionally, S24 may further include forming a protective layer. The protective layer may be made of PMMA, PBMA, or nylon, which can effectively protect the reflective layer from falling off or being scratched.

[0182] S25. Making a light-absorbing structure.

[0183] In the embodiment of the present disclosure, the light absorbing structure can be a film layer attached to the reflective layer.

[0184] For example, the light absorbing structure may be a graphite layer, a carbon fiber layer, or a carbon black ink layer.

[0185] In this implementation, the above-mentioned materials used in the light-absorbing structure are all black light-absorbing materials, which can absorb the light from the light bar and make the brightness of the backlight module more uniform.

[0186] Exemplarily, the light absorption structure is a graphite layer, and each light absorption pattern is an ink dot.

[0187] In this implementation, the light absorbing structure can be formed by silk screen printing or other methods.

[0188] In other embodiments, the light absorption structure may be a structure formed by openings in the reflective layer, and each light absorption pattern is also a through hole.

[0189] In the embodiment of the present disclosure, the back panel includes a rectangular bottom surface and four side surfaces connected to the bottom surface.

[0190] The two ends of the light bar face the two opposite side surfaces respectively, and the light absorption structure is located on the reflective layer on the bottom surface of the back plate and the two side surfaces facing the two ends of the light bar.

[0191] In this implementation, since the light is strongest near the light bar, the light-absorbing structure is arranged in the above manner, surrounding the light bar. This allows the light-absorbing structure to absorb the light from the stronger part of the light bar, making the brightness of the backlight module more uniform.

[0192] In other embodiments, the back plate may further include a circular bottom surface and four side surfaces connected to the bottom surface.

[0193] In the embodiment of the present disclosure, the light absorption pattern is circular.

[0194] The plurality of light absorption patterns are arranged in rows, and each row is arranged at equal intervals.

[0195] In this implementation, a circular light-absorbing pattern is used for ease of production; arranging the light strips equidistantly in rows allows the light-absorbing structure to absorb the light more evenly, making the brightness of the backlight module more uniform.

[0196] In other embodiments, the light absorption pattern may also be a rectangle or other light absorption patterns.

[0197] In other embodiments, the plurality of light absorption patterns may be arranged in columns or irregularly.

[0198] In the embodiment of the present disclosure, in the same row, the distance between two adjacent light absorption patterns may be 5-8 mm.

[0199] In this implementation, the two adjacent light absorption patterns adopt the above distance, which can ensure the brightness of the backlight module while making the light of the backlight module more uniform.

[0200] Exemplarily, the distance between two adjacent light absorption patterns is 6 mm.

[0201] In the embodiment of the present disclosure, in the light absorption structure, the diameter of the light absorption pattern in the nth row close to the light bar may be 4-0.5×(n-1) to 6-0.5(n-1) mm;

[0202] n is an integer greater than or equal to 1.

[0203] In this implementation, the diameter of the light absorption pattern in the light absorption structure is calculated using the above formula. The calculated diameter can ensure the brightness of the backlight module while making the light of the backlight module more uniform.

[0204] For example, in the light absorption structure, the diameter of the first row of light absorption patterns close to the light bar is 4 to 6 mm; the diameter of the second row of light absorption patterns close to the light bar is 3.5 to 5.5 mm, and so on.

[0205] Optionally, the light absorption pattern may further include a circle, a rectangle, and a trapezoid.

[0206] In the embodiment of the present disclosure, the light absorption structure on the reflective layer on the bottom surface of the back plate is circular, and the light absorption structures on the two opposite sides of the light bar are composed of circular, rectangular and trapezoidal shapes.

[0207] The two side light absorption structures have a trapezoid located in the middle of the first row of circles.

[0208] The rectangles in the two side light-absorbing structures are located in the second and third rows. The second row is entirely rectangular, and the third row has a circle at each end and is entirely rectangular in the middle.

[0209] In the embodiment of the present disclosure, the upper base of the trapezoid is 17-19 nm, the lower base is 25-27 nm, and the height is 4-6 nm.

[0210] Exemplarily, the upper base of the trapezoid is 17 nm, the lower base is 25 nm, and the height is 4 nm.

[0211] In the embodiment of the present disclosure, the length of the rectangle is 5 to 7 nm, and the width is 4 to 6 nm.

[0212] Exemplarily, the length of the rectangle is 5 nm and the width is 4 nm.

[0213] The rectangle and trapezoid are structures formed by openings in the reflective layer, and each rectangle or trapezoid is also a through hole.

[0214] S26. Make a diffusion plate.

[0215] In the disclosed embodiment, the diffusion plate is located on the light emitting surface of the backlight module.

[0216] In the disclosed embodiments, the diffuser plate can be made of silicone, epoxy, acrylic, or other materials. Silicone diffusers offer excellent weather resistance and flexibility; epoxy diffusers offer excellent mechanical strength and electrical insulation; and acrylic diffusers offer high light transmittance and ease of processing, allowing adjustments to be made based on light uniformity.

[0217] Exemplarily, the material of the diffusion plate is silica gel.

[0218] The above description is merely an optional embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present disclosure shall be included in the scope of protection of the present disclosure.

Claims

1. A backlight module, characterized in that: The backlight module comprises: a back plate (101), a reflective layer (102), a light bar (103) and a light absorption structure (104); The back panel (101) comprises a bottom surface and side surfaces surrounding the bottom surface and connected to the edge of the bottom surface; the light bar (103) is located on the bottom surface of the back panel (101) and connected to the back panel (101); and the reflective layer (102) covers the bottom surface and side surfaces of the back panel (101); The light absorption structure (104) is at least located on the reflective layer (102) on the bottom surface of the back plate (101), and the light absorption structure (104) includes a plurality of light absorption patterns (1041). The areas of the plurality of light absorption patterns (1041) gradually decrease in a direction away from the light bar (103).

2. The backlight module according to claim 1, wherein: The back plate (101) comprises a rectangular bottom surface and four side surfaces connected to the bottom surface; The two ends of the light bar (103) face the two opposite side surfaces respectively. The light absorption structure (104) is located on the bottom surface of the back plate (101) and on the two side surfaces of the reflective layer (102) facing both ends of the light bar (103).

3. The backlight module according to claim 1 or 2, characterized in that: The light absorption pattern (1041) is circular; The plurality of light absorption patterns (1041) are arranged in rows, and each row is arranged at equal intervals.

4. The backlight module according to claim 3, wherein: In the same row, the distance between two adjacent light absorption patterns (1041) is 5-8 mm.

5. The backlight module according to claim 3, wherein: In the light absorbing structure (104), The diameter of the light absorption pattern (1041) in the nth row close to the light bar (103) is 4-0.5×(n-1) to 6-0.5(n-1) mm; n is an integer greater than or equal to 1.

6. The backlight module according to claim 1 or 2, wherein: The light bar (103) comprises: a plurality of light-emitting devices (202) and a plurality of lenses (204); The distance between adjacent light-emitting devices (202) among the plurality of light-emitting devices (202) is smaller than the distance between the light-emitting device (202) and the reflective layer (102) on the side surface of the back plate (101); The plurality of lenses (204) respectively cover the plurality of light-emitting devices (202); The lens (204) is used to change the light emission angle of the light emitting device (202), so that the light emission angle of the light emitting device (202) in the y direction is greater than the light emission angle in the x direction, the x direction is the length direction of the light emitting device (202), and the y direction is a direction perpendicular to the x direction.

7. A method for preparing a backlight module, characterized in that: The method comprises: Making a backboard, the backboard comprising a bottom surface and a side surface surrounding the bottom surface and connected to an edge of the bottom surface; Making a light bar, wherein the light bar is located on the bottom surface of the back plate and connected to the back plate; Making a reflective layer, wherein the reflective layer covers the bottom surface and side surfaces of the back plate; A light absorption structure is manufactured. The light absorption structure is located on the reflective layer on the bottom and side surfaces of the back panel. The light absorption structure includes a plurality of light absorption patterns. The areas of the plurality of light absorption patterns gradually decrease in a direction away from the light bar.

8. The method according to claim 7, characterized in that The back plate includes a rectangular bottom surface and four side surfaces connected to the bottom surface; The two ends of the light bar face the two opposite sides respectively. The light absorption structure is located on the bottom surface of the back plate and the two side surfaces of the reflective layer facing the two ends of the light bar.

9. The method according to claim 7 or 8, characterized in that The light absorption pattern is circular; The plurality of light absorption patterns are arranged in rows, and each row is arranged at equal intervals.

10. The method according to claim 9, characterized in that In the same row, the distance between two adjacent light absorption patterns is 5-8 mm.

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