Backlight module, display module and display device

Abstract

A backlight module includes a backplate (11), a frame (12) disposed on one side of the backplate (11) and connected to the backplate (11), a light source assembly (13) located inside the frame (12), and a reflective sheet (14), a light guide plate (15), and an optical film assembly (16) stacked sequentially inside the frame (12); the light source assembly (13) includes a circuit board (131) and a light source (132) disposed on a first side of the circuit board (131), the light source (132) being located at the first side of the light guide plate (15); the light guide plate (15) includes a first surface facing the reflective sheet (14) and a second surface away from the reflective sheet (14). The end face of the frame (12) facing the back plate (11) is provided with a first annular step (121) and a second annular step (122). The portion of the reflective sheet (14) near the circumferential edge is bonded to the first annular step (121) by the first double-sided adhesive (21). The reflective sheet (14) is also bonded to the portion of the first surface of the light guide plate (15) near the other sides except the first side by the first double-sided adhesive (21). The portion of the second surface of the light guide plate (15) near the circumferential edge is set towards the second annular step (122). The portion of the second surface of the light guide plate near the first side is fixed on the second annular step (122).

Description

Technical Field

[0001] This disclosure relates to, but is not limited to, the field of display technology, specifically to a backlight module, a display module, and a display device. Background Technology

[0002] Currently, in-vehicle display devices often use liquid crystal displays. The backlight module of some in-vehicle liquid crystal displays includes a frame, back plate, light source, light guide plate and optical film. The light guide plate is usually in a moving state inside the backlight module, and the overall stability of the backlight module is insufficient, which affects the display effect. Summary of the Invention

[0003] The following is an overview of the subject matter described in detail herein. This overview is not intended to limit the scope of the claims.

[0004] This disclosure provides a backlight module, including a backplate, a frame disposed on one side of the backplate and connected to the backplate, a light source assembly located inside the frame, and a reflective sheet, a light guide plate, and an optical film assembly stacked sequentially inside the frame. The light source assembly includes a circuit board and a light source disposed on a first side of the circuit board, the light source being located at a first side of the light guide plate. The light guide plate includes a first surface facing the reflective sheet and a second surface facing away from the reflective sheet. The end face of the frame facing the backplate is provided with a first annular step and a second annular step. A portion of the reflective sheet near its circumferential edge is bonded to the first annular step by a first double-sided adhesive. The reflective sheet is also bonded to a portion of the first surface of the light guide plate near the remaining sides (excluding the first side) by the first double-sided adhesive. A portion of the second surface of the light guide plate near its circumferential edge is disposed towards the second annular step, and a portion of the second surface of the light guide plate near its first side is fixed to the second annular step.

[0005] This disclosure also provides a display module, including a display panel and the backlight module.

[0006] This disclosure also provides a display device, including the aforementioned display module.

[0007] After reading and understanding the accompanying diagrams and detailed descriptions, the other aspects can be understood. Attached Figure Description

[0008] The accompanying drawings are provided to further illustrate the technical solutions of this disclosure and form part of the specification. They are used together with the embodiments of this disclosure to explain the technical solutions of this disclosure and do not constitute a limitation on the technical solutions of this disclosure. The shapes and sizes of the components in the drawings do not reflect actual proportions and are only intended to illustrate the content of this disclosure.

[0009] Figure 1A schematic cross-sectional view of a display module for some exemplary embodiments;

[0010] Figure 2 In some exemplary embodiments Figure 1 Top view of the backlight module;

[0011] Figure 3 In some exemplary embodiments Figure 2 A partial structural diagram of the backlight module at point A';

[0012] Figure 4 for Figure 3 A partial structural diagram of the middle rubber frame;

[0013] Figure 5 In some exemplary embodiments Figure 2 A schematic diagram of a partial cross-sectional structure at point A' of the backlight module;

[0014] Figure 6 In some exemplary embodiments Figure 2 A partial structural diagram of the backlight module at point B' or C';

[0015] Figure 7 for Figure 6 A partial structural diagram after the second tape has been removed.

[0016] The attached figures are labeled as follows:

[0017] 11. Backplate; 12. Frame; 13. Light source assembly; 14. Reflector; 15. Light guide plate; 16. Optical film assembly; 21. First double-sided adhesive; 22. Second double-sided adhesive; 23. Third double-sided adhesive; 31. First tape; 32. Second tape; 41. Fixing frame; 51. Display panel.

[0018] 111. Base plate; 112. Side plate; 121. First annular step; 122. Second annular step; 123. Third annular step; 124. Transition surface; 125. Clearance groove; 126. First fixing platform; 127. Slot; 128. Second fixing platform; 131. Circuit board; 132. Light source; 161. First lug; 161a. First lug of the first optical film; 161b. First lug of the second optical film; 161c. First lug of the third optical film; 162. Second lug; 411. Frame plate; 412. Baffle plate.

[0019] 1201, First border; 1202, Second border; 1203, Third border; 1204, Fourth border; 1221, Receiving slot. Detailed Implementation

[0020] Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the embodiments of this disclosure without departing from the spirit and scope of the technical solutions of the embodiments of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

[0021] This disclosure provides a backlight module, in some exemplary embodiments, such as Figure 1 As shown, Figure 1 This is a cross-sectional structural diagram of a display module for some exemplary embodiments. The backlight module includes a back plate 11, a frame 12 disposed on one side of the back plate 11 and connected to the back plate 11, a light source assembly 13 located inside the frame 12, and a reflective sheet 14, a light guide plate 15, and an optical film assembly 16 arranged in sequence inside the frame 12.

[0022] The light source assembly 13 includes a circuit board 131 and a light source 132 disposed on a first side of the circuit board 131. The light source 132 is located at the first side of the light guide plate 15. The light guide plate 15 includes a first surface facing the reflective sheet 14 and a second surface facing away from the reflective sheet 14.

[0023] The end face of the frame 12 facing the back plate 11 is provided with a first annular step 121 and a second annular step 122. The portion of the reflective sheet 14 near the circumferential edge is bonded to the first annular step 121 by the first double-sided adhesive 21. The reflective sheet 14 is also bonded to the portion of the first surface of the light guide plate 15 near the other sides except the first side by the first double-sided adhesive 21.

[0024] The portion of the second surface of the light guide plate 15 near the circumferential edge is disposed toward the second annular step 122, and the portion of the second surface of the light guide plate 15 near the first side is fixed to the second annular step 122.

[0025] In this embodiment of the backlight module, the first annular step 121 and the second annular step 122 provided on the frame 12 can respectively limit and fix the reflective sheet 14 and the light guide plate 15. The reflective sheet 14 is fixed on the first annular step 121 by the first double-sided adhesive 21, and the reflective sheet 14 is bonded to the portion of the first surface of the light guide plate 15 near the other side except the first side. The portion of the second surface of the light guide plate 15 near the first side is fixed on the second annular step 122. In this way, the reflective sheet 14, the light guide plate 15 and the frame 12 are fixed together to form a whole, which can prevent the light guide plate 15 and the reflective sheet 14 from moving inside the backlight module, which is beneficial to enhancing the overall stability of the backlight module and facilitating the assembly of the backlight module.

[0026] In some exemplary embodiments, such as Figure 1As shown, a receiving groove 1221 may be provided on the second annular step 122. The side of the circuit board 131 facing away from the light source 132 is bonded to the receiving groove 1221 by a second double-sided adhesive 22. The portion of the second surface of the light guide plate 15 near the first side is bonded to the first side of the circuit board 131 by a third double-sided adhesive 23. Figure 1 As shown at point B in the middle.

[0027] In this embodiment, the light source assembly 13 is fixed to the frame 12, and the portion of the second surface of the light guide plate 15 near the first side is fixed to the circuit board 131 of the light source assembly 13. This allows the light source assembly 13, the reflector 14, the light guide plate 15, and the frame 12 to be fixed together as a whole, facilitating assembly with the backplate 11 and enhancing the overall stability of the backlight module. By placing the circuit board 131 of the light source assembly 13 within the receiving groove 1221, the first side of the circuit board 131 is approximately flush with the surface of the second annular step 122, preventing damage to the light guide plate 15 from uneven surfaces.

[0028] For example, such as Figure 2 As shown, Figure 2 In some exemplary embodiments Figure 1 A top view of the backlight module shows that the frame 12 can be rectangular and may include opposing first and second borders 1201 and 1202, as well as opposing third and fourth borders 1203 and 1204. Correspondingly, the reflective sheet 14 and the light guide plate 15 can both be rectangular. Both the light guide plate 15 and the reflective sheet 14 include opposing first and second sides, as well as opposing third and fourth sides. The first, second, third, and fourth sides of the light guide plate 15 are respectively positioned close to the first border 1201, second border 1202, third border 1203, and fourth border 1204 of the frame 12. Figure 1 and Figure 2 As shown, the receiving groove 1221 can be disposed on the first frame 1201, and the circuit board 131 can be a long strip of flexible circuit board or rigid circuit board. The receiving groove 1221 can extend along the length direction of the first frame 1201. The portion of the reflective sheet 14 near the circumferential edge (four sides) is bonded to the first annular step 121 by the first double-sided adhesive 21. The reflective sheet 14 is also bonded to the portions of the first surface of the light guide plate 15 near the second, third, and fourth sides by the first double-sided adhesive 21. Figure 1 As shown at point A, the portion of the first surface of the light guide plate 15 near the first side is not bonded to the reflective sheet 14, as shown below. Figure 1 As shown at point C.

[0029] In other embodiments, the portion of the second surface of the light guide plate near the first side can be bonded to the second annular step using a fourth double-sided adhesive. The adhesive frame includes a transition surface connecting the first and second annular steps, and the side of the circuit board of the light source assembly facing away from the light source can be fixed to the transition surface using double-sided adhesive.

[0030] In some exemplary embodiments, such as Figure 1 As shown, the frame 12 includes a transition surface 124 connecting the first annular step 121 and the second annular step 122; the light source 132 is located between the first side of the light guide plate 15 and the transition surface 124, and the distance between the first side of the light guide plate 15 and the transition surface 124 is greater than the distance between the other sides of the light guide plate 15 and the transition surface 124. This provides sufficient space between the first side of the light guide plate 15 and the transition surface 124 to accommodate the light source assembly 13, and facilitates the bonding of the portion of the first surface of the light guide plate 15 near the other sides (excluding the first side) to the reflector 14 using the first double-sided adhesive 21.

[0031] In some exemplary embodiments, such as Figure 1 As shown, the end face of the frame 12 facing away from the back plate 11 may be provided with a third annular step 123. The third annular step 123 is configured to limit the portion of the surface of the display panel 51 facing away from the display side near the circumferential edge.

[0032] In some exemplary embodiments, such as Figure 1 As shown, the back panel 11 may include a base plate 111 and a side plate 112 disposed on the circumferential edge of the base plate 111, the side plate 112 surrounding the outside of the frame 12. Exemplarily, the frame 12 may be engaged with the side plate 112 by a snap-fit ​​connection to fix the frame 12 and the back panel 11 together.

[0033] In some exemplary embodiments, such as Figure 1 As shown, the optical film group 16 may include multiple stacked optical films. For example, the optical film group 16 may include three stacked optical films. Along the direction away from the light guide plate 15, the three optical films may be, in sequence, a diffuser, a first prism sheet, and a second prism sheet. The diffuser can more uniformly distribute the light emitted from the second surface of the light guide plate 15, and the first and second prism sheets can converge the light emitted from the diffuser towards the viewing direction, thus enhancing brightness. In other embodiments, the number of optical films in the optical film group may be three or more.

[0034] In some exemplary embodiments, such as Figure 3 , Figure 4 and Figure 5 As shown, Figure 3 In some exemplary embodiments Figure 2 A partial structural diagram of the backlight module at point A'. Figure 4 for Figure 3 A partial structural diagram of the middle rubber frame. Figure 5 In some exemplary embodiments Figure 2 A partial cross-sectional structural diagram of the backlight module at point A' is shown. The optical film group 16 includes multiple stacked optical films. At least one side of the frame 12 is provided with a relief groove 125. Each optical film has a first lug 161 on its side near the relief groove 125. The first lug 161 of each optical film extends into the relief groove 125 and is fixed in the relief groove 125 by a first adhesive tape 31.

[0035] In one example of this embodiment, such as Figure 3 , Figure 4 and Figure 5 As shown, a first fixing platform 126 is provided on both sides of the clearance groove 125 on the adhesive frame 12. The first adhesive tape 31 has an adhesive surface facing the optical film. The adhesive surface of the first adhesive tape 31 has a stepped structure. The two ends of the first adhesive tape 31 are respectively bonded to the two first fixing platforms 126. Each step of the stepped structure is bonded to a corresponding first lug 161, thereby fixing the first lug 161 of each optical film in the clearance groove 125. Exemplarily, the clearance groove 125 can be provided at the third annular step 123. The surface of the first fixing platform 126 bonded to the first adhesive tape 31 can be lower than the surface of the third annular step 123 facing away from the light guide plate 15. The surface of the first adhesive tape 31 facing away from the adhesive surface can be approximately flush with the surface of the third annular step 123 facing away from the light guide plate 15.

[0036] For example, such as Figure 3 and Figure 5As shown, multiple first lugs can be stacked. In two adjacent optical films, the first lug of the optical film farther from the light guide plate partially exposes the first lug of the optical film closer to the light guide plate. Taking the optical film group 16, which includes three optical films, as an example, along the direction away from the light guide plate 15, the three optical films are, in sequence, a first optical film, a second optical film, and a third optical film. The first lug 161b of the second optical film partially exposes the first lug 161a of the first optical film, and the first lug 161c of the third optical film partially exposes the first lug 161b of the second optical film. The exposed portions of the first lug 161a of the first optical film, the exposed portions of the first lug 161b of the second optical film, and the first lug 161c of the third optical film form a stepped shape, thereby correspondingly bonding with each step of the stepped structure of the first adhesive tape 31. An avoidance groove 125 can be provided on one side of the frame 12, and the avoidance groove 125 can extend along the length direction of one side of the frame 12 where the avoidance groove 125 is located.

[0037] In some exemplary embodiments, such as Figure 6 and Figure 7 As shown, Figure 6 In some exemplary embodiments Figure 2 A partial structural diagram of the backlight module at point B' or C'. Figure 7 for Figure 6 The partial structural diagram after removing the second adhesive tape shows that the optical film assembly 16 includes multiple stacked optical films. At least one edge of the adhesive frame 12 has a slot 127. Each optical film has a second lug 162 on its side near the slot 127. Multiple second lugs 162 are stacked and extend into the slot 127. In this embodiment, the slot 127 cooperates with the multiple second lugs 162 to limit the position of each optical film.

[0038] For example, such as Figure 6 and Figure 7 As shown, the frame 12 can be provided with second fixing platforms 128 on both sides of the slot 127. A second adhesive tape 32 is adhered to the second fixing platform 128, spanning the slot 127 and located on the side of the plurality of second lugs 162 opposite to the light guide plate 15. The second adhesive tape 32 is not adhered to the second lugs 162. The second adhesive tape 32 serves as a limiting element, preventing the plurality of second lugs 162 from jumping out of the slot 127. The fact that the second adhesive tape 32 is not adhered to the second lugs 162 prevents the optical film from deforming due to complete fixation during thermal expansion.

[0039] For example, such as Figure 6 and Figure 7 As shown, one or more slots 127 can be provided on one side of the frame 12, and the sizes of the multiple second lugs 162 can be the same or different. The slots 127 can be located at the third annular step 123. The surface of the second fixing platform 128 that is bonded to the second adhesive tape 32 can be lower than the surface of the third annular step 123 facing away from the light guide plate 15, and the surface of the second adhesive tape 32 facing away from the bonding surface can be approximately flush with the surface of the third annular step 123 facing away from the light guide plate 15. The slots and the clearance grooves can be respectively provided on different sides of the frame, for example, as shown in the image. Figure 2 As shown, the clearance groove can be provided on the third side 1203 of the frame 12, and the slot is provided on the fourth side 1204 of the frame 12.

[0040] This disclosure also provides a display module, which includes a display panel and a backlight module as described in any of the preceding embodiments.

[0041] In one example of this embodiment, such as Figure 1 As shown, the end face of the frame 12 facing away from the back plate 11 may have a third annular step 123. The display panel 51 is located inside the frame 12, and the portion of the surface of the display panel 51 facing away from the display side near the circumferential edge faces the third annular step 123. Exemplarily, double-sided adhesive can be applied to the third annular step 123 to fix the display panel 51, or the display panel 51 may not be fixed to the third annular step 123; a buffer layer can be applied to the third annular step 123 to protect the display panel 51. The display panel 51 may be a liquid crystal display panel, etc.

[0042] For example, such as Figure 1 As shown, the display module may further include a fixing frame 41 connected to the backlight module. The fixing frame 41 includes a frame plate 411, which abuts against the end face of the frame 12 facing away from the back plate 11 and is located near the circumferential edge of the display surface of the display panel 51. Thus, the portion of the display panel 51 near the circumferential edge can be clamped and fixed by the frame plate 411 of the fixing frame 41 and the third annular step 123 of the frame 12. Exemplarily, the fixing frame 41 may further include a baffle 412 connected to the outer peripheral edge of the frame plate 411. The baffle 412 can be snapped and fixed to the side plate 112 of the back plate 11 by a snap-fit ​​structure. For example, a slot can be provided on the baffle 412, and a snap-fit ​​that cooperates with the slot can be provided on the side plate 112 of the back plate 11.

[0043] This disclosure also provides a display device, including the display module described in any of the preceding embodiments. The display device can be any product or component with display function, such as a mobile phone, tablet computer, television, monitor, laptop computer, digital photo frame, or navigator.

[0044] In the accompanying drawings, the size of constituent elements, the thickness of layers, or areas are sometimes exaggerated for clarity. Therefore, embodiments of this disclosure are not necessarily limited to these dimensions, and the shape and size of each component in the drawings do not reflect true proportions. Furthermore, the drawings schematically illustrate some examples, and embodiments of this disclosure are not limited to the shapes or values ​​shown in the drawings.

[0045] In this description, "parallel" refers to the state where the angle formed by two straight lines is greater than -10° and less than 10°, and therefore includes the state where the angle is greater than -5° and less than 5°. Similarly, "perpendicular" refers to the state where the angle formed by two straight lines is greater than 80° and less than 100°, and therefore includes the state where the angle is greater than 85° and less than 95°.

[0046] In this specification, for convenience, terms such as "middle," "upper," "lower," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," and "outer" are used to indicate orientation or positional relationships in conjunction with the accompanying drawings. This is solely for the purpose of facilitating the description and simplification, and does not imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this disclosure. The positional relationships of the constituent elements may be appropriately varied depending on the orientation of each constituent element being described. Therefore, the use of terms not limited to those described in the specification may be appropriately replaced as needed.

[0047] In this description, unless otherwise expressly specified and limited, the terms "connection," "fixed connection," "installation," and "assembly" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; the terms "installation," "connection," and "fixed connection" can refer to a direct connection, an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art will understand the meaning of the above terms in the embodiments of this disclosure as appropriate.

Claims

1. A backlight module, comprising a back plate, a frame disposed on one side of the back plate and connected to the back plate, a light source assembly located inside the frame, and a reflective sheet, a light guide plate and an optical film assembly arranged sequentially inside the frame; The light source assembly includes a circuit board and a light source disposed on a first side of the circuit board, the light source being located at a first side of the light guide plate; the light guide plate includes a first surface facing the reflector and a second surface facing away from the reflector. The end face of the frame facing the back plate is provided with a first annular step and a second annular step. The portion of the reflective sheet near the circumferential edge is bonded to the first annular step by a first double-sided adhesive. The reflective sheet is also bonded to the portion of the first surface of the light guide plate near the remaining sides except the first side by the first double-sided adhesive. The portion of the second surface of the light guide plate near the circumferential edge is disposed toward the second annular step, and the portion of the second surface of the light guide plate near the first side is fixed on the second annular step; The optical film assembly includes multiple stacked optical films. At least one edge of the frame is provided with a slot. Each optical film has a second lug on its side near the slot. Multiple second lugs are stacked and extend into the slot. The frame is provided with second fixing platforms on both sides of the slot. A second adhesive tape is adhered to the second fixing platform. The second adhesive tape crosses the slot and is located on the side of the multiple second lugs opposite to the light guide plate. The second adhesive tape is not adhered to the second lugs so that the optical films will not deform due to being completely fixed when thermally expanded.

2. The backlight module as described in claim 1, wherein, The second annular step is provided with a receiving groove. The side of the circuit board facing away from the light source is bonded to the receiving groove by a second double-sided adhesive. The portion of the second surface of the light guide plate near the first side is bonded to the first side of the circuit board by a third double-sided adhesive.

3. The backlight module as described in claim 1, wherein, The portion of the second surface of the light guide plate near the first side is bonded to the second annular step using a fourth double-sided adhesive.

4. The backlight module as described in claim 1, wherein, The frame includes a transition surface connecting the first annular step and the second annular step; the light source is located between the first side of the light guide plate and the transition surface, and the distance between the first side of the light guide plate and the transition surface is greater than the distance between the other sides of the light guide plate and the transition surface.

5. The backlight module as described in claim 1, wherein, The optical film assembly includes multiple stacked optical films. At least one edge of the frame is provided with a clearance groove. Each optical film has a first lug on its side near the clearance groove. The first lug of each optical film extends into the clearance groove and is fixed in the clearance groove by a first adhesive tape.

6. The backlight module as described in claim 5, wherein, The adhesive frame is provided with a first fixing platform on both sides of the clearance groove. The first adhesive tape has an adhesive surface facing the optical film. The adhesive surface of the first adhesive tape has a stepped structure. The two ends of the first adhesive tape are respectively bonded to the two first fixing platforms. Each step of the stepped structure is bonded to a corresponding first lug.

7. The backlight module as described in claim 5, wherein, Multiple first lugs are stacked, and in two adjacent optical films, the first lug of the optical film farther from the light guide plate partially exposes the first lug of the optical film closer to the light guide plate.

8. The backlight module as described in claim 1, wherein, The end face of the frame facing away from the back plate is provided with a third annular step, which is configured to limit the portion of the display panel near the circumferential edge on the surface facing away from the display side.

9. The backlight module as described in claim 1, wherein, The back panel includes a bottom plate and side plates disposed on the circumferential edge of the bottom plate, the side plates surrounding the outside of the rubber frame.

10. A display module, comprising a display panel and a backlight module as described in any one of claims 1 to 9.

11. The display module as claimed in claim 10, wherein, The end face of the frame facing away from the back plate is provided with a third annular step. The display panel is located inside the frame, and the portion of the surface of the display panel facing away from the display side near the circumferential edge is arranged toward the third annular step.

12. The display module of claim 11, further comprising a fixing frame connected to the backlight module, the fixing frame comprising a frame plate abutting against the end face of the frame facing away from the back plate and located at a portion of the display surface of the display panel near the circumferential edge.

13. A display device comprising the display module according to any one of claims 10 to 12.

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