TW202201089A - Backlight module and fabrication method thereof and display module - Google Patents

Abstract

A backlight module includes a back plate, a light guide plate, a light-emitting element and an insert molding piece. The back plate includes a bottom plate, a first side and a second side. The second side is adjacent to the first side, and the first side and the second side are both substantially perpendicular to the bottom plate. The light guide plate is disposed on the bottom plate and between the first side and the second side. The insert molding piece is formed and fixed on the first side and the second side, and the insert molding piece is made from a material having a Type-A Shore hardness of smaller than 90.

Description

Backlight module, backlight module manufacturing method and display module

The present invention relates to a backlight module, a manufacturing method of the backlight module and a display module with the backlight module.

FIG. 1 is a schematic diagram of a conventional backlight module. As shown in FIG. 1 , in the backlight module 100 , in order to meet the design requirement of a narrow frame, a manufacturing method of forming a plastic frame 104 on the back plate 102 is adopted. However, currently, the material of the plastic frame 104 is usually a hard plastic such as polycarbonate (PC). However, due to the low elastic compression of the hard material, a large thermal expansion space must be reserved (gap G as shown in FIG. 1 ). ) to the light guide plate 106 and the optical film 108, which may easily lead to the problem of edge light leakage. Furthermore, the plastic frame 104 made of hard material is severely restricted in its external design in order to prevent the mold from being stuck and unable to be demolded.

The "prior art" paragraph is only used to help understand the content of the present invention, so the content disclosed in the "prior art" paragraph may contain some that do not constitute the prior art known to those with ordinary skill in the art. The content disclosed in the "prior art" paragraph does not represent the content or the problem to be solved by one or more embodiments of the present invention, and has been known or recognized by those with ordinary knowledge in the technical field before the application of the present invention.

The invention provides a backlight module, a manufacturing method of the backlight module and a display module with the backlight module.

Other objects and advantages of the present invention can be derived from the technology disclosed in the present invention. Learn more about the surgical characteristics.

In order to achieve one or part or all of the above objectives or other objectives, an embodiment of the present invention provides a backlight module, which includes a backplane, a light guide plate, a light-emitting element, and a buried incident and output element. The back panel includes a bottom panel, a first side panel and a second side panel, the first side panel and the second side panel are arranged adjacent to each other, and both the first side panel and the second side panel are substantially perpendicular to the bottom panel. The light guide plate is arranged on the bottom plate and is located between the first side plate and the second side plate, and the light-emitting element is arranged adjacent to one side of the light guide plate. The embedded injection part is formed and fixed on the first side plate and the second side plate, and the embedded injection part is made of a material with a Shore A hardness value (HSA) less than 90.

In one embodiment, the buried incident and output member has an extension portion extending toward the light guide plate.

In one embodiment, the backlight module further includes at least one optical film, which is stacked on the light guide plate, wherein the extension portion covers at least part of the optical film.

In one embodiment, the buried incident-out member is provided with a plurality of bumps that can abut against the light guide plate.

In one embodiment, the embedded injector includes a covering portion and a hook portion, the covering portion at least partially covers the first side plate and the second side plate, and the hook portion has a protruding portion and an extension portion extending toward the light guide plate. The protruding portion extends from the covering portion in a direction opposite to the bottom plate, and the protruding portion, the extending portion and the covering portion form at least one groove.

In one embodiment, the embedded injector is rubber, silicone or thermoplastic elastomer.

Another embodiment of the present invention provides a display module including a backlight module and a display panel. The backlight module includes a backplane, a light guide plate, a light-emitting element, and a buried incident and output element. The back panel includes a bottom panel, a first side panel and a second side panel, the first side panel and the second side panel are arranged adjacent to each other, and both the first side panel and the second side panel are substantially perpendicular to the bottom panel. The light guide plate is arranged on the bottom plate and is located between the first side plate and the second side plate, and the light-emitting element is arranged adjacent to the light guide plate. one side, and the display panel is stacked on the light guide plate. The embedded injection part is formed and fixed on the first side plate and the second side plate, and the embedded injection part is made of a material whose A-type Shore hardness value is less than 90.

In one embodiment, the buried incident and output member has an extension portion extending toward the light guide plate, and the display panel is disposed on the extension portion.

In one embodiment, the embedded injector includes a covering portion and a hook portion, the covering portion at least partially covers the first side plate and the second side plate, and the hook portion has a protruding portion and an extension extending toward the light guide plate. Department. The protruding part, the extending part and the covering part form at least one groove, and at least two sides of the display panel are received in the at least one groove.

Another embodiment of the present invention provides a method for manufacturing a backlight module, which includes the following steps. First, the backing plate is placed into the cavity of the mold, and the plastic is filled into the cavity and cooled to form an embedded injection part covering at least two sides of the back plate at least partially, wherein the embedded injection part has a Shore hardness value of Type A. less than 90. Furthermore, the embedded injector and the backplane are released from the mold, and the light guide plate and the light-emitting element are arranged on the backplane at least partially covered by the embedded injector.

Embodiments of the present invention have at least one of the following advantages. With the designs of the above-mentioned embodiments, since the embedded incident and exit parts are made of soft materials with elastic compression, the expansion space that must be reserved can be reduced, which is helpful to realize the narrow frame design, and the light guide plate and the optical film can be used in the past. Buried in the direction of the incoming and outgoing parts, the effect of avoiding light leakage at the edge and improving the visual taste is obtained. Furthermore, the soft embedded injector can be designed with various shapes as required without being restricted by the demolding process. The soft material constituting the embedded injector can be used as a buffer material for the backplane, light guide plate or optical film. The cladding and cushioning properties can provide impact resistance and protect optical components such as display panels. In addition, the embedded injector can be provided with a groove to accommodate the optical element, and the embedded injector can be provided with an extension portion, which can increase the sticking width of double-sided tape used for sticking the display panel and avoid double-sided tape. One end of the glue is suspended, and the extension part can also provide the effect of shielding the stray light from the edge. Furthermore, a plurality of bumps can be formed on the buried injection-out member The surface can help to locate the light guide plate and/or the optical film, and help to avoid the thermal expansion of the light guide plate and the optical film from being deformed and damaged by extrusion.

Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention. In order to make the above-mentioned and other objects, features and advantages of the present invention more obvious and easy to understand, the following specific embodiments are given in conjunction with the accompanying drawings, and are described in detail as follows.

10, 10a, 10b: Backlight module

12, 12a: Backplane

121: Bottom plate

122, 122a: the first side plate

123: Second side panel

124, 124a: Third side panel

125: Fourth side panel

14: Light guide plate

141: light-emitting surface

142: Side

16: Light-emitting element

18: Optical film

22, 22a~22c: Buried injection and output parts

221: Coating Department

222: hook part

222a: Projection

222b: Extensions

223, 223a: groove

224: bump

30: Display module

32: Display panel

34: Double-sided tape

36: Shell

S10-S60: Method steps

100: Backlight module

102: Backplane

104: plastic frame

106: light guide plate

108: Optical film

A, B: direction

G: Spacing

FIG. 1 is a schematic diagram of a conventional backlight module.

FIG. 2 is a schematic diagram of a backlight module according to an embodiment of the present invention.

FIG. 3 is a schematic perspective view of the configuration of the backplane and the light guide plate in the embodiment of FIG. 2 of the present invention.

4A to 4C are schematic diagrams showing different structural embodiments of the buried injector and the backplane.

FIG. 5 is a schematic diagram of a display module according to another embodiment of the present invention.

FIG. 6 is a schematic diagram of the demolding process of the backplane and the embedded injection-out part of the present invention.

FIG. 7 is a schematic diagram of a backlight module according to another embodiment of the present invention.

FIG. 8 is a schematic diagram of a structure of a buried injection-outlet member according to another embodiment of the present invention.

FIG. 9 is a flow chart of the manufacturing method of the backlight module of the present invention.

The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of the embodiments with reference to the drawings. The directional terms mentioned in the following embodiments, such as: up, down, left, right, front or rear, etc., are only for referring to the directions of the attached drawings. Therefore, the directional terms used are intended to illustrate and not to limit make the present invention.

FIG. 2 is a schematic diagram illustrating a backlight module according to an embodiment of the present invention. Referring to FIG. 2 , in the present embodiment, the backlight module 10 includes a backplane 12 , a light guide plate 14 , a light-emitting element 16 and a buried injector 22 , the backplane 12 includes a bottom plate 121 and a first side plate 122 , and the light guide plate 14 is provided with On the bottom plate 121 of the backplane 12 , the light emitting element 16 is disposed adjacent to one side of the light guide plate 14 , and the backlight module 10 may further include at least one optical film 18 stacked on the light guide plate 14 . An insert molding piece 22 is formed and fixed on the first side plate 122 of the back plate 12 , and the insert molding piece 22 can be made of a material with a Shore A hardness (HSA) of less than 90. For example, the embedded injector 22 can be made of soft materials such as rubber, silicone, or thermoplastic elastomer (TPE). In this embodiment, the embedded injector 22 may include a covering portion 221 and a hook portion 222. The covering portion 221 covers the first side plate 122 of the backplane 12. Further, the cross-section of the covering portion 221 is, for example, The hook portion 222 has a protruding portion 222 a and an extension portion 222 b connected to the protruding portion 222 a and extending toward the light guide plate 14 , which is similar to a “C” shape and covers the top surface and both side surfaces of the first side plate 122 . . Specifically, the protruding portion 222a of the embedded injector 22 extends from the cladding portion 221 in a direction A opposite to the back plate 12, and the extending portion 222b of the embedded injector 22 may be located above the protruding portion 222a, and The protruding portion 222 a extends in the direction B toward the light guide plate 14 , wherein the protruding portion 222 a , the extending portion 222 b and the covering portion 221 form at least one groove 223 . The groove 223 can accommodate or limit at least one optical element (not shown) such as a display panel.

FIG. 3 is a three-dimensional schematic diagram of the configuration of the backplane and the light guide plate in the embodiment of FIG. 2 of the present invention, and FIGS. 4A to 4C are schematic diagrams showing different structural embodiments of the buried incident-outlet member and the backplane. Please refer to FIG. 3 and FIG. 4A at the same time, in this embodiment, the back plate 12 may further include a second side plate 123 , the first side plate 122 and the second side plate 123 are disposed adjacent to each other, and the first side plate 122 and the second side plate 123 are both It is substantially perpendicular to the bottom plate 121 (for example, the normal direction of the bottom plate 121 is perpendicular to the normal direction of the first side plate 122, and the normal direction of the bottom plate 121 is the same as the The normal direction of the second side plate 123 is vertical). The light guide plate 14 is disposed on the bottom plate 121 and located between the first side plate 122 and the second side plate 123 . In this embodiment, the embedded injector 22 as shown in FIG. 4A can be formed and fixed to the first side plate 122 and the second side plate 123 of the back plate 12 at least at the same time. However, the present invention is not limited thereto. In other embodiments, the back plate 12 may include at least three side plates. As shown in FIG. 4B , the back plate 12 may have a first side plate 122 , a second side plate 123 and a third side plate 124 , which are buried The injector 22 can be formed and fixed on the first side plate 122 , the second side plate 123 and the third side plate 124 of the back plate 12 . In another embodiment, as shown in FIG. 4C , the back panel 12 may have a first side panel 122 , a second side panel 123 , a third side panel 124 and a fourth side panel 125 , and the embedded injector 22 may be formed and fixed to the back panel. The first side panel 122 , the second side panel 123 , the third side panel 124 and the fourth side panel 125 of the panel 12 . It can be known from the above-mentioned different embodiments that the back plate 12 has different numbers of side plates according to actual needs, and the embedded injector 22 can be configured to correspond to the side plates of the back plate 12 . Here, it should be noted that the buried injection and output elements 22 do not need to be formed on all the side plates of the backplane 12 as shown in FIGS. 4A to 4C . For example, in other embodiments, the buried injection and output elements 22 are only formed on the backplane 12 of FIG. 4C . Two adjacent side plates 122, 123 or three side plates 122, 123, 124 in the four sides may also be used, and the present invention is not particularly limited.

FIG. 5 is a schematic diagram of a display module according to another embodiment of the present invention. The display module 30 of this embodiment includes a backlight module 10 a, a display panel 32 , and optionally includes a casing 36 . As shown in FIG. 5, in the display module 30, the back panel 12a of the backlight module 10a includes a first side panel 122a, a second side panel (not shown) adjacent to the first side panel 122a, and a second side panel (not shown) not adjacent to the first side panel 122a. The third side plate 124a of the side plate 122a, the embedded light-emitting element 22a of the backlight module 10a provided with the groove 223a can cover the first side plate 122a, the second side plate and the third side plate 124a of the back plate 12a, and the display panel 32 is stacked on the On the light guide plate 14 and the optical film 18, and at least two sides of the display panel 32 are supported in the grooves 223a (for example, provided in the grooves 223a of the first side plate 122a and the second side plate of the back plate 12a, or provided in The grooves 223a) of the first side plate 122a, the second side plate and the third side plate 123a of the back plate 12a. Again, show The casing 36 of the display module 30 can abut against the embedded injector 22a so that the display panel 32 is more stably confined in the groove 223a without moving left and right. In this embodiment, the display panel 32 is accommodated in the groove 223 a is only an example. In other embodiments, the groove 223 a can also accommodate different optical components such as the optical film 18 or other optical films.

Further, with the designs of the above-mentioned embodiments, since the embedded injection-out part 22 (or the embedded-injection-out part 22 a ) is made of a soft material with a Shore A hardness value of less than 90, it has elastic compression, so even if the light guide plate 14 The light guide plate 14 and the optical film 18 will not be deformed or damaged, so the light guide plate 14 (or the optical film 18 ) and the embedded incident and output member 22 can be reduced in size. The expansion space reserved between them (gap G as shown in FIG. 5 ) makes it easy to realize a narrow frame design, and the light guide plate 14 (or the optical film 18 ) can be further extended in the direction of the buried incident and outgoing member 22 , so as to avoid edge light leakage and avoid light leakage. The effect of improving visual taste. Furthermore, since the embedded injector 22 is formed on at least two adjacent side plates of the back plate 12, when the embedded injector 22 is made of a soft material, the molded embedded injector 22 can be released from the mold by elastic deformation. membrane. For example, FIG. 6 is a schematic diagram of the demolding process of the backplane and the embedded injector of the present invention. As shown in FIG. 6 , when the embedded injection member 22 is formed on the back plate 12 by the embedded injection process and is to be separated from the mold (not shown), the hook portion 222 formed of the soft material can be squeezed to generate elasticity Therefore, when the mold is released upwards, the hook portion 222 can be opened to allow the mold to be separated from the embedded injector 22 (or the embedded injector 22 can be separated from the mold), and the soft hook portion 222 can be restored to its original state after being released. However, if the conventional embedded injector is designed with a hard material, when the embedded injector is formed on two adjacent side plates of the backplane, if the embedded injector forms a hook structure, the hook structure cannot be elastically deformed, so it will The mold is stuck and cannot be demolded. Therefore, the soft buried injector 22 of the above embodiment can be designed with various shapes according to requirements without being restricted by the demolding process. Furthermore, the soft material embedded in the incident and output member 22 itself can be used as a buffer material for the back plate 12, the light guide plate 14 or the optical film 18, and its wrapping and buffering properties can provide an anti-collision effect and provide protection. Such as the optics of the display panel 32 .

FIG. 7 is a schematic diagram of a backlight module according to another embodiment of the present invention. As shown in FIG. 7 , the optical film 18 of the backlight module 10 b is stacked on the light guide plate 14 , and the embedded incident-outlet member 22 b partially covers at least the first side plate 122 of the back plate 12 and has an extending toward the direction B of the light guide plate 14 . The extension portion 222b, the extension portion 222b can cover at least a part of the optical film 18, and the display panel (not shown) can be disposed on the extension portion 222b. In the present embodiment, a double-sided adhesive tape 34 is further arranged on the embedded injection-out member 22b for pasting and fixing the display panel (not shown), for example, on the extension part 222b. The part 222b can have a larger sticking width and can prevent one end of the double-sided tape 34 from hanging in the air, thereby improving the reliability of sticking and positioning, and the extending part 222b can also provide the effect of shielding edge stray light.

FIG. 8 is a schematic diagram of a structure of a buried injection-outlet member according to another embodiment of the present invention. As shown in FIG. 8 , a plurality of bumps 224 can be formed on the buried incident-out member 22c. The bumps 224 protrude from the buried incident-out member 22c toward the light guide plate 14. The bumps 224 can abut against the light-emitting surface 141 of the light guide plate 14 and The side surface 142 that is substantially perpendicular to the light-emitting surface 141 can be selectively abutted, but the invention is not limited thereto. In another embodiment, the bumps 224 can also abut against the optical film 18 as shown in FIG. 2 . For example, the bumps 224 can provide a better positioning effect for the light guide plate 14 and/or the optical film 18, and the arrangement of the bumps 224 can reduce the amount of the light guide plate 14 (and/or the optical film 18) and the buried incident-out part 22c. Therefore, when the light guide plate 14 and the optical film 18 are thermally expanded, the soft bumps 224 can be compressed, and the soft bumps 224 can provide sufficient deformation. The amount and buffering effect ensure that the light guide plate 14 and the optical film 18 will not be deformed and damaged due to extrusion. It is particularly noted that, in this embodiment, the single-sided buried injection-out member 22c is used as an example for description, but the present invention is not limited to this. In other embodiments, the bumps 224 embedded in the injector 22c can be selectively applied to any side plate of the different embedded injectors 22 in the embodiments of FIGS. 4A to 4C .

The invention provides a manufacturing method of a backlight module. FIG. 9 is a flow chart of the manufacturing method of the backlight module of the present invention. As shown in FIG. 9 , in this manufacturing method, the backing plate is first placed into the cavity of the mold (step S20 ), and then the plastic is filled into the cavity and cooled to form a buried at least partially covering at least two sides of the backing plate. The injection-out part (step S30 ), wherein the Shore A hardness value (HSA) of the embedded injection-out part can be less than 90. Next, the embedded injector and the backplane are released from the mold (step S40 ), and the light guide plate and the light-emitting element are disposed on the backplane at least partially covered by the embedded injector (step S50 ).

To sum up, the embodiments of the present invention have at least one of the following advantages. With the designs of the above-mentioned embodiments, since the embedded incident and exit parts are made of soft materials with elastic compression, the expansion space that must be reserved can be reduced, which is helpful to realize the narrow frame design, and the light guide plate and the optical film can be used in the past. Buried in the direction of the incoming and outgoing parts, the effect of avoiding light leakage at the edge and improving the visual taste is obtained. Furthermore, the soft embedded injector can be designed with various shapes as required without being restricted by the demolding process. The soft material constituting the embedded injector can be used as a buffer material for the backplane, light guide plate or optical film. The cladding and cushioning properties can provide impact resistance and protect optical components such as display panels. In addition, the embedded injector can be provided with a groove to accommodate the optical element, and the embedded injector can be provided with an extension, so as to increase the sticking width of the double-sided tape for adhering the display panel and avoid the double-sided tape. One end is suspended, and the extension part can also provide the effect of blocking stray light at the edge. Furthermore, a plurality of bumps can be formed on the surface of the buried input and output members to assist in positioning the light guide plate and/or the optical film, and help to prevent the thermally expanded light guide plate and the optical film from being deformed and damaged by extrusion.

However, the above are only preferred embodiments of the present invention, and should not limit the scope of implementation of the present invention, that is, simple equivalent changes and modifications made according to the scope of the patent application of the present invention and the contents of the description of the invention, All still fall within the scope of the patent of the present invention. In addition, it is not necessary for any embodiment of the present invention or the claimed scope of the present invention to achieve all of the objects or advantages or features disclosed in the present invention. In addition, mentioned in this specification or the scope of the patent application The terms such as "first" and "second" are only used to name the names of elements or to distinguish different embodiments or ranges, and are not used to limit the upper or lower limit of the number of elements.

10: Backlight module

12: Backplane

14: Light guide plate

16: Light-emitting element

18: Optical film

22: Buried injection and output parts

121: Bottom plate

122: First side panel

221: Coating Department

222: hook part

222a: Projection

222b: Extensions

223: Groove

A, B: direction

Claims (10)

A backlight module, comprising: a back panel including a bottom panel, a first side panel and a second side panel, wherein the first side panel and the second side panel are arranged adjacent to each other, and the first side panel and the second side panel are both substantially perpendicular to the bottom panel; a light guide plate disposed on the bottom plate and between the first side plate and the second side plate; a light-emitting element adjacent to one side of the light guide plate; and An embedded injector is formed and fixed on the first side plate and the second side plate, and the embedded injector is made of a material with a Shore A hardness value of less than 90. The backlight module as described in claim 1, wherein the embedded injector has an extension portion extending toward the light guide plate. The backlight module as described in item 2 of the patent application scope further includes: At least one optical film is stacked on the light guide plate, wherein the extension portion covers at least a part of the at least one optical film. The backlight module as described in claim 1, wherein the buried injection-out member is provided with a plurality of bumps, and the bumps abut against the light guide plate. The backlight module of claim 1, wherein the embedded injector includes a covering portion and a hook portion, the covering portion at least partially covers the first side plate and the second side plate, and The hook portion has a protruding portion and an extending portion extending toward the light guide plate, wherein the protruding portion extends from the covering portion in a direction opposite to the bottom plate, and the protruding portion, the extending portion and the covering portion forms at least one groove. The backlight module of claim 1, wherein the embedded injection-out member is made of rubber, silicone or thermoplastic elastomer. A display module, comprising: A backlight module, the backlight module includes: a back panel including a bottom panel, a first side panel and a second side panel, wherein the first side panel and the second side panel are arranged adjacent to each other, and the first side panel and the second side panel are both substantially perpendicular to the bottom panel; a light guide plate disposed on the bottom plate and between the first side plate and the second side plate; a light-emitting element adjacent to one side of the light guide plate; and an embedded injector, molded and fixed on the first side plate and the second side plate, and the embedded injector is made of a material with a Shore A-type hardness less than 90; and A display panel is stacked on the light guide plate. The display module as described in claim 7, wherein the embedded incident-out member has an extension portion extending toward the light guide plate, and the display panel is disposed on the extension portion. The display module of claim 7, wherein the embedded injector includes a covering portion and a hook portion, the covering portion at least partially covers the first side plate and the second side plate, and The hook portion has a protruding portion and an extending portion extending toward the light guide plate, wherein the protruding portion, the extending portion and the covering portion form at least one groove, and at least two sides of the display panel are received in the at least one groove. A method for manufacturing a backlight module, comprising the following steps; Putting a backing plate into a cavity of a mold; Filling a plastic into the mold cavity and cooling to form a buried injection part covering at least two sides of the back plate at least partially, wherein the A-type Shore hardness of the buried injection part is less than 90; disengaging the embedded injector together with the backing plate from the mold; and A light guide plate and a light emitting element are arranged on the backplane which is at least partially covered by the embedded injector.

Images