A side-entry backlight module and display device

Abstract

The present application discloses a light bar, an edge-entry backlight module and a display device, wherein the light bar comprises a light board connected to a light guide plate, a light emitter arranged on the light board and a flexible circuit board connected between the light board and a main control circuit board, or the light bar comprises a flexible circuit board connected between the light guide plate and the main control circuit board and a light emitter arranged on the flexible circuit board, wherein the flexible circuit board comprises a folding buffer zone between the light emitter and the main control circuit board. The light bar uses the folding buffer zone to offset the moving distance caused by the expansion or contraction of the light guide plate, so that the flexible circuit board will not interfere with the fixing tape, and can also avoid the change of the spacing between the light emitter and the light guide plate to cause poor light shadow.

Description

Technical Field

[0001] The present application belongs to the field of display technology, and in particular relates to an edge-type backlight module and a display device. Background Art

[0002] Since liquid crystal itself does not emit light, a backlight module is required in a liquid crystal display (LCD) device to provide light source for the liquid crystal display device. Backlight modules are mainly divided into two categories: edge-type backlight modules and direct-type backlight modules.

[0003] In related technologies, such as Figure 1 As shown in the figure, the edge-entry backlight module includes a backplane, a light guide plate (Light Guide Plate, LGP) arranged on the backplane, and a light emitting diode (Light Emitting Diode, LED) located on the side of the light guide plate. The light emitting diode is arranged on a flexible printed circuit (Flexible Printed Circuit, FPC) as a light source to form a light bar. One end of the flexible printed circuit is attached to the bottom of the light guide plate by a front-light adhesive, and the other end is flipped to the back of the backplane. Then, the edge-entry backlight module and the display panel (Panel) are fixed together by a fixing tape (Cell Tape). The light guide plate is generally made of polycarbonate (Polycarbonate, PC) or polymethyl methacrylate (polymethyl methacrylate, PMMA) materials. Both have a certain expansion and contraction coefficient under high and low temperature conditions, especially polymethyl methacrylate has a larger expansion and contraction coefficient under high and low temperature conditions. In a certain product, the light guide plate is measured to expand or shrink by about 1 mm. When the backlight module of this structure is subjected to high temperature or temperature shock, such as Figure 2 As shown in FIG. 1 , the force generated by the high-temperature expansion of the light guide plate is first transmitted to the flexible circuit board, driving the flexible circuit board to move, causing interference between the flexible circuit board and the fixing tape (CellTape) of the backlight module, and at the same time driving the light-emitting diode to move, causing the light-emitting diode and the light guide plate to be misaligned, resulting in poor light shadow; as shown in FIG. Figure 3 As shown, the force generated by the low-temperature contraction of the light guide plate is first transmitted to the flexible circuit board, which drives the flexible circuit board to move while driving the light-emitting diode to move, increasing the gap (Gap) between the light-emitting diode and the light guide plate. The misalignment of the light-emitting diode and the light guide plate leads to the occurrence of poor lamp shadows. In addition, the glue in front of the lamp and the light guide plate are continuously separated by force, and the activation rate of the glue in front of the lamp fails, resulting in more serious relative misalignment between the light-emitting body and the light guide plate, making it impossible for the light of the light-emitting body to completely enter the light guide plate, causing the flexible circuit board to darken in front of the lamp.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The present application aims to at least to some extent solve the technical problem that the light guide plate of the backlight module expands or contracts under high and low temperature impact, causing the flexible circuit board and light-emitting diode to shift and cause interference or poor light shadow. To this end, the present application provides a light bar, a side-entry backlight module and a display device.

[0006] An embodiment of the present application provides a light bar, which includes a light board connected to a light guide plate, a light-emitting body arranged on the light board, and a flexible circuit board connected between the light board and a main control circuit board, or the light bar includes a flexible circuit board connected between the light guide plate and the main control circuit board and a light-emitting body arranged on the flexible circuit board, wherein the flexible circuit board includes a folding buffer zone located between the light-emitting body and the main control circuit board.

[0007] In some embodiments, the folding buffer includes folding protrusions connected in sequence, and the folding protrusions can be switched between a compressed state and an extended state.

[0008] In some embodiments, the compression and extension margin of the folding buffer zone is greater than or equal to the expansion and contraction margin of the light guide plate.

[0009] In some embodiments, when the folding protrusion of the folding buffer is in a compressed state, the maximum height of the folding protrusion is smaller than the height of the light-emitting body.

[0010] In some embodiments, the flexible circuit board also includes: a first connection area connected to the light board or the light guide plate; a second connection area connected to the main control circuit board; and an adhesive area located between the folding buffer area and the second connection area, and the adhesive area is connected to the back panel.

[0011] The embodiment of the present application further provides an edge-type backlight module, the edge-type backlight module comprising:

[0012] A back panel, including a front side of the back panel and a back side of the back panel;

[0013] A light guide plate, arranged on the front side of the back plate, the light guide plate comprising at least one incident surface and an exit surface connected to the incident surface; and a light bar as described in any one of claims 1 to 5, the light bar is connected to the bottom surface of the light guide plate through the light board or the flexible circuit board so that the light-emitting body is opposite to the incident surface.

[0014] In some embodiments, the folding buffer zone is located on the front side of the back plate.

[0015] In some embodiments, the distance between the folding buffer area and the edge of the back panel is 0.3 ± 0.1 mm.

[0016] In some embodiments, the adhesive area is adhered to the back side of the back panel and / or the front side of the back panel.

[0017] In some embodiments, the light emitter is in contact with the incident surface.

[0018] In some embodiments, a reflective plate is provided between the back plate and the light guide plate; and an optical film group is provided on a side of the light guide plate away from the front side of the back plate.

[0019] In some embodiments, the back plate includes a frame folded over the light guide plate, the back plate is provided with a through hole so that the flexible circuit board passes through the through hole and is folded over to the back of the back plate, and the edge-entry backlight module further includes:

[0020] A reflective film, wherein a first portion of the reflective film is disposed on a side of the frame body adjacent to the light emitting body, and a second portion of the reflective film is disposed between the optical film group and the light guide plate; and,

[0021] A light shielding film, wherein a first portion of the light shielding film is arranged on a side of the frame away from the light emitting body, and a second portion of the light shielding film is arranged between the optical film group and the display panel.

[0022] In some embodiments, the optical film set includes a diffuser, and a support plate is provided on a side of the diffuser that overlaps the reflective film and is away from the reflective film, and the support plate is adhered to the diffuser.

[0023] An embodiment of the present application further provides a display device, which includes the above-mentioned light bar or the above-mentioned edge-type backlight module.

[0024] The embodiments of the present application have at least the following beneficial effects:

[0025] The light bar provided in the embodiment of the present application has a folding buffer zone on the flexible circuit board. When the light bar is set in an edge-entry backlight module, the folding buffer zone can be used to offset the movement distance caused by the expansion or contraction of the light guide plate. That is, when the light guide plate expands, the light guide plate drives the light board and the flexible circuit board to move synchronously or drives the flexible circuit board to move, and first compresses the compression margin of the folding buffer zone. When the light guide plate contracts, the light guide plate drives the flexible circuit board to move and first stretches the elongation margin of the folding buffer zone. Therefore, the distance between the light source and the light guide plate does not change, and the flexible circuit board will not move in the direction of the fixing tape to interfere with the fixing tape, nor will it change the distance between the light source and the light guide plate to cause poor light shadow.

[0026] In the above-mentioned edge-entry backlight module provided by the embodiment of the present application, the light board or flexible circuit board of the light bar is connected to the light guide plate. When the light guide plate expands or contracts, the light guide plate will drive the light board and the flexible circuit board to move synchronously or drive the flexible circuit board to move, and finally make the flexible circuit board move to a certain extent. Since the flexible circuit board has a folding buffer zone, the folding buffer zone can be used to offset the moving distance caused by the expansion or contraction of the light guide plate, that is, when the light guide plate expands, the light guide plate drives the flexible circuit board to move and first compresses the compression margin of the folding buffer zone, and when the light guide plate contracts, the light guide plate drives the flexible circuit board to move and first stretches the elongation margin of the folding buffer zone, so the distance between the light source and the light guide plate does not change, and the flexible circuit board will not move in the direction of the fixed tape to interfere with the fixed tape, nor will the distance between the light source and the light guide plate change to cause poor light shadow. At the same time, since the force at the connection between the light board or the flexible circuit board and the light guide plate is offset by the folding buffer zone, it can avoid the connection between the light board or the flexible circuit board and the light guide plate from being continuously separated by force, thereby improving the service life of the edge-entry backlight module. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 A schematic diagram of the cross-sectional structure of a backlight module in the related art is shown;

[0029] Figure 2 Shows Figure 1 A cross-sectional view of the backlight module after the light guide plate expands;

[0030] Figure 3 Shows Figure 1 A cross-sectional view of the backlight module after the light guide plate is shrunk;

[0031] Figure 4 A schematic cross-sectional structure diagram of an edge-lit backlight module in an embodiment of the present application is shown;

[0032] Figure 5 A schematic cross-sectional structure diagram of an edge-type backlight module in another embodiment of the present application is shown;

[0033] Figure 6 Shows Figure 4 The cross-sectional state diagram of the edge-entry backlight module after the light guide plate expands;

[0034] Figure 7 Shows Figure 4 Comparison of the edge-entry backlight module before and after the light guide plate expands.

[0035] Reference numerals:

[0036] 10. Traditional flexible circuit board; 100. Back panel; 110. Frame; 200. Light guide plate; 300. Light bar; 310. Flexible circuit board; 311. First connection area; 312. Light-emitting body fixing area; 313. Folding buffer zone; 314. Pasting area; 315. Second connection area; 320. Light-emitting body; 330. Light board; 400. Front-light glue; 500. Reflection plate; 600. Optical film group; 610. Diffuser; 611. Support plate; 620. Prism; 700. Reflection film; 800. Shading film; 900. Fixing tape; 1000. Control circuit board; 1100. Glass substrate; 1200. Glass cover. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0038] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0039] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0040] The first aspect of the present application provides a light bar 300, which can be used in an edge-type backlight module, such as Figure 4 and Figure 5 As shown, the light bar 300 of this embodiment includes a light board 330 connected to the light guide plate 200, a light-emitting body 320 arranged on the light board 330, and a flexible circuit board 310 connected between the light board 330 and the main control circuit board, or the light bar 300 includes a flexible circuit board 310 connected between the light guide plate 200 and the main control circuit board and a light-emitting body 320 arranged on the flexible circuit board 310, wherein the flexible circuit board 310 includes a folding buffer zone 313 located between the light-emitting body 320 and the main control circuit board.

[0041] In the light bar 300 of the present embodiment, the flexible circuit board 310 has a folding buffer 313. When the light bar 300 is set in the edge-entry backlight module, the folding buffer 313 can be used to offset the moving distance caused by the expansion or contraction of the light guide plate 200. That is, when the light guide plate 200 expands, the light guide plate 200 drives the light board 330 and the flexible circuit board 310 to move synchronously or drives the flexible circuit board 310 to move, and first compresses the compression margin of the folding buffer 313. When the light guide plate 200 contracts, the light guide plate 200 drives the flexible circuit board 310 to move and first stretches the elongation margin of the folding buffer 313. Therefore, the distance between the light emitting body 320 and the light guide plate 200 does not change, and the flexible circuit board 310 will not move in the direction of the fixing tape 900 to interfere with the fixing tape 900, nor will the distance between the light emitting body 320 and the light guide plate 200 change to cause poor light shadow. In the present embodiment, the light emitting body 320 can be a light emitting diode.

[0042] As an optional implementation, Figure 7 As shown, the folding buffer 313 includes folding protrusions connected in sequence, and the folding protrusions can be switched between a compressed state and an extended state. Further preferably, the compression and extension margin of the folding buffer 313 is greater than or equal to the expansion and contraction margin of the light guide plate 200.

[0043] In this embodiment, the minimum compression and expansion margin of the folding buffer 313 of the flexible circuit board 310 can be obtained according to the high-temperature expansion of the light guide plate 200, and the structure of the folding buffer 313 can be inferred. Figure 7As shown, the number of triangular wave folding protrusions of the folding buffer 313 is set to n, the angle of the triangular wave is α, and the height of the triangular wave is H (equivalent to the height of the folding buffer 313). Then, the compression and stretch margin of the folding buffer 313 of the flexible circuit board 310 is 2n*H / Cosα. When the minimum compression and stretch margin of the folding buffer 313 and the maximum height of the folding buffer 313 are known, the number of triangular waves set in the folding buffer 313 can be inferred.

[0044] As an optional implementation, Figures 4 to 7 As shown, when the folding protrusion of the folding buffer zone 313 is in a compressed state, the maximum height of the folding protrusion is smaller than the height of the light emitting body 320 .

[0045] In this embodiment, the maximum height of the folding buffer area 313 is limited, so that after the force generated by the expansion of the light guide plate 200 is applied to the folding buffer area 313, the maximum height of the folding buffer area 313 formed by compression will not exceed the height of the light-emitting body 320, that is, it will not interfere with the structure above the area, thereby avoiding interference that affects the compression, folding, compression or stretching of the folding buffer area 313 itself.

[0046] As an optional implementation, Figure 4 and Figure 5 As shown, the flexible circuit board 310 also includes: a first connection area 311, connected to the light board 330 or the light guide plate 200; a second connection area 315, connected to the main control circuit board, and a bonding area 314, located between the folding buffer area 313 and the second connection area 315, and the bonding area 314 is connected to the back panel 100.

[0047] like Figure 4 As shown, in this embodiment, the first connection area 311 of the flexible circuit board 310 is connected to the light guide plate 200. For example, the first connection area 311 can be attached to the bottom of the light guide plate 200 by the front-light glue 400. The flexible circuit board 310 is turned over to the back of the back plate 100 so that the second connection area 315 can be connected to the main control circuit board located on the back of the back plate 100. At the same time, by attaching the adhesive area 314 of the flexible circuit board 310 to the back plate 100, the adhesive area 314 of the flexible circuit board 310 is fixed to the back plate 100, and the flexible circuit board 310 is fixed to the light guide plate 200 and the back plate 100 in two sections, which can effectively prevent the area near the adhesive area 314 of the flexible circuit board 310 from shifting and interfering with the fixing tape 900. Further optionally, a light-emitting body fixing area 312 is provided between the first connection area 311 and the folding buffer area 313, and the light-emitting body 320 is provided on the light-emitting body fixing area 312.

[0048] like Figure 5As shown, in this embodiment, the first connection area 311 of the flexible circuit board 310 is connected to the light board 330, and the light board 330 is further connected to the light guide plate 200. For example, the light board 330 can be attached to the bottom of the light guide plate 200 by the front light glue 400, and the flexible circuit board 310 is turned over to the back of the back plate 100 so that the second connection area 315 can be connected to the main control circuit board located on the back of the back plate 100. At the same time, by attaching the adhesive area 314 of the flexible circuit board 310 to the back plate 100, the adhesive area 314 of the flexible circuit board 310 is fixed on the back plate 100, and the flexible circuit board 310 is fixed on the light guide plate 200 and the back plate 100 in two sections, it can effectively prevent the area near the adhesive area 314 of the flexible circuit board 310 from shifting and interfering with the fixing tape 900.

[0049] Based on the same inventive concept, the second aspect of the present application proposes a side-lit backlight module, such as Figure 4 and Figure 5 As shown, the edge-type backlight module includes:

[0050] The back plate 100 includes a front side of the back plate 100 and a back side of the back plate 100;

[0051] A light guide plate 200 is disposed on the front side of the back plate 100, and the light guide plate 200 has at least one incident surface and an exit surface connected to the incident surface; and

[0052] The light bar 300 is connected to the bottom surface of the light guide plate 200 through the light board 330 or the flexible circuit board 310 so that the light emitting body 320 is opposite to the incident surface.

[0053] The edge-type backlight module of this embodiment is as follows: Figure 4 Shown and Figure 5As shown, the light board 330 or the flexible circuit board 310 of the light bar 300 is connected to the light guide plate 200 to achieve a fixed connection between the light bar 300 and the light guide plate 200. When the light guide plate 200 expands or contracts, the light guide plate 200 will drive the light board 330 and the flexible circuit board 310 to move synchronously or drive the flexible circuit board 310 to move, and finally make the flexible circuit board 310 move to a certain extent. Since the flexible circuit board 310 has a folding buffer zone 313, the folding buffer zone 313 can be used to offset the movement distance caused by the expansion or contraction of the light guide plate 200, that is, when When the light guide plate 200 expands, the light guide plate 200 drives the flexible circuit board 310 to move and first compress the compression margin of the folding buffer zone 313. When the light guide plate 200 contracts, the light guide plate 200 drives the flexible circuit board 310 to move and first stretch the elongation margin of the folding buffer zone 313. Therefore, the distance between the light emitting body 320 and the light guide plate 200 does not change, and the flexible circuit board 310 does not move in the direction of the fixing tape 900 to interfere with the fixing tape 900, nor does it change the distance between the light emitting body 320 and the light guide plate 200 to cause poor light shadow. At the same time, because the force at the connection between the light board 330 or the flexible circuit board 310 and the light guide plate 200 is offset by the folding buffer zone 313, it can avoid the continuous force separation of the front light glue 400 of the first connection area 311 and the light guide plate 200, thereby improving the service life of the side-entry backlight module.

[0054] Since liquid crystal itself does not emit light, a backlight module needs to be set in the liquid crystal display device to provide light source for the liquid crystal display device. Backlight modules are mainly divided into two categories: edge-entry backlight modules and direct-type backlight modules. The actual device formed by the edge-entry backlight module has the advantages of low power consumption, thin thickness and low cost, and is favored by consumers. Figure 1 The edge-entry backlight module includes a back panel 100, a light guide plate 200 arranged on the back panel 100, and a light-emitting diode located on the incident surface of the light guide plate 200, wherein the light-emitting diode is arranged on a traditional light panel 330 or a traditional flexible circuit board 10 to form a traditional light bar 300 structure with the traditional flexible circuit board 10, and one end of the traditional flexible circuit board 10 is adhered to the bottom of the light guide plate 200 through a front-lamp glue 400, and the other end is flipped to the back of the back panel 100 to connect with the main control circuit. The frame 110 is buckled on the edge-entry backlight module to support the display panel (Panel), and then the edge-entry backlight module is fixed to the display panel by a fixing tape 900 (Cell Tape). In the backlight module with this structure, since the traditional flexible circuit board 310 is flatly arranged on the back panel 100, the traditional flexible circuit board 310 reserves a gap of about 1.0 mm between the light-emitting body 320 and the edge of the back panel 100. As shown Figure 2As shown, the force generated by the light guide plate 200 when it expands at high temperature is first transmitted to the traditional flexible circuit board 10, driving the traditional flexible circuit board 10 to move to the right side of the figure, causing interference between the traditional flexible circuit board 10 and the fixing tape 900 of the backlight module, and at the same time driving the light emitting body 320 to move, causing the light emitting body 320 and the light guide plate 200 to be misaligned, resulting in the occurrence of poor light shadow; Figure 3 As shown, the force generated by the light guide plate 200 when it shrinks at low temperature is first transmitted to the traditional flexible circuit board 10, driving the traditional flexible circuit board 10 to move to the left side of the figure while driving the light-emitting body 320 to move, so that the gap (Gap) between the light-emitting diode and the light guide plate 200 increases, and the light-emitting body 320 and the light guide plate 200 are misaligned, resulting in poor lamp shadow; that is, the traditional flexible circuit board 10 will move as a whole when subjected to force, thereby causing the distance between the light-emitting body 320 and the light guide plate 200 to change, and the traditional flexible circuit board 10 as a whole extends toward the direction of the fixing tape 900 and interferes with the fixing tape 900.

[0055] In the present application, an inventive concept for offsetting the movement of the flexible circuit board 310 caused by the expansion or contraction of the light guide plate 200 is proposed. It is proposed to set a folding buffer zone 313 on the flexible circuit board 310 to absorb the displacement of the flexible circuit board 310 caused by the expansion or contraction of the light guide plate 200. The expansion or contraction of the light guide plate 200 is offset by folding or stretching the folding buffer zone 313, thereby ensuring that the position of the part where the flexible circuit board 310 is connected to the main control circuit board on the back plate 100 is relatively fixed, and the gap between the light source 320 and the light guide plate 200 is fixed, thereby avoiding poor light shadow or interference caused by the overall movement of the light bar 300 with the light guide plate 200. In this embodiment, if Figures 4 to 7As shown, the folding buffer 313 has a fold bend in the expansion and contraction direction of the light guide plate 200, which can make the folding buffer 313 have a buffering effect similar to a spring. Since the light bar 300 can be attached to the bottom of the incident surface of the light guide plate 200 through the light board 330 or the flexible circuit board 310, when the light guide plate 200 expands or contracts, the light emitter 320 can move synchronously with the light guide plate 200, and the folding buffer 313 can absorb the force and displacement of the movement of the light guide plate 200, and the connection area with the main control circuit board will not move synchronously. When the flexible circuit board 310 is subjected to the pressure generated by the expansion of the light guide plate 200, the folding buffer 313 is first compressed to keep the relative positions of the first connection area 311, the second connection area 315 and the light guide plate 200 unchanged; when the flexible circuit board 310 is subjected to the tension generated by the contraction of the light guide plate 200, the folding buffer 313 is first stretched to keep the relative positions of the first connection area 311, the second connection area 315 and the light guide plate 200 unchanged. The position of the area of ​​the flexible circuit board 310 adjacent to the fixing tape 900 relative to the back plate 100 will not move and will not interfere with the fixing tape 900; the light guide plate 320 moves synchronously with the light guide plate 200, so the distance between the light guide plate 320 and the light guide plate 200 remains unchanged, which can avoid the problem of poor light shadow caused by the change of the distance between the light guide plate 320 and the light guide plate 200.

[0056] In this embodiment, the light-emitting body 320 arranged on the light board 330 or the flexible circuit board 310 is between the light guide plate 200 and the folding buffer zone 313, and the light board 330, the flexible circuit board 310 and the light guide plate 200 are fixedly connected, so the connection between the light-emitting body 320 and the light guide plate 200 is similar to a rigid connection, and the distance between the light-emitting body 320 and the light guide plate 200 remains unchanged during the movement, so the distance between the light-emitting body 320 and the incident surface of the light guide plate 200 can be maintained.

[0057] In this embodiment, if Figure 4 As shown, the light guide plate 200 is provided with an incident surface, and the light emitted by the light emitting body 320 of the light bar 300 enters the light guide plate 200 through the incident surface, and then is emitted from the exit surface connected to the incident surface, and the direction of the light is changed by the light guide plate 200.

[0058] In other embodiments, the light guide plate 200 may also be provided with two incident surfaces located on two opposite sides of the light guide plate 200, and a group of light strips 300 are respectively provided on the incident surfaces on the two opposite sides of the light guide plate 200. The setting method and principle of the light strips 300 on both sides of the light guide plate 200 are the same as those in the present embodiment and will not be repeated here.

[0059] As an optional implementation, Figure 4 and Figure 5As shown, the folding buffer zone 313 is located on the front side of the back plate 100 .

[0060] In the present embodiment, in order to enable the folding buffer zone 313 to offset the movement displacement of the flexible circuit board 310 caused by the expansion or contraction of the light guide plate 200, it is preferred to make the folding buffer zone 313 as close to the light guide plate 200 as possible. Therefore, in the present embodiment, the folding buffer zone 313 and the light guide plate 200 are arranged on the front side of the back plate 100. The force generated by the expansion or contraction of the light guide plate 200 can be applied to the folding buffer zone 313 without changing the direction, so that the folding buffer zone 313 can better absorb the stress and deformation generated by the expansion or contraction of the light guide plate 200.

[0061] As an optional implementation, Figures 4 to 6 As shown, the distance between the folding buffer zone 313 and the edge of the back plate 100 is 0.3±0.1 mm.

[0062] In this embodiment, the distance between the folding buffer area 313 and the edge of the back plate 100 is set to 0.3±0.1 mm, so that the folding buffer area 313 will not break through the edge of the back plate 100 and interfere with the fixing tape 900 during compression or expansion.

[0063] As an optional implementation, Figure 4 and Figure 5 As shown, the adhesive area 314 is adhered to the back side of the back plate 100 and / or the front side of the back plate 100 .

[0064] In this embodiment, the adhesive area 314 can be adhered to the back side of the back panel 100, even if the end of the flexible circuit board 310 away from the light guide plate 200 is fixed on the back side of the back panel 100, so that the part of the flexible circuit board 310 adjacent to the fixing tape 900 is fixed on the back panel 100, which can effectively prevent the part of the flexible circuit board 310 from moving due to the expansion or contraction of the light guide plate 200, thereby interfering with the fixing tape 900.

[0065] It should be noted that in this embodiment, after the pasting area 314 of the flexible circuit board 310 is pasted on the back of the back plate 100 , the flexible circuit board 310 is folded back to the back of the back plate 100 so that the control circuit connection area can be connected to the control circuit board 1000 .

[0066] In this embodiment, the adhesive area 314 can be adhered to the front side of the back panel 100, so that the portion of the folding buffer area 313 adjacent to the edge of the back panel 100 can be fixed through the adhesive area 314. When the folding buffer area 313 is subjected to the force generated by the expansion or contraction of the light guide plate 200, the portion of the folding buffer area 313 adjacent to the edge of the back panel 100 will not move, and the flexible circuit board will not be forced to move when folded from the front side of the back panel 100 to the back side of the back panel 100 and interfere with the fixing tape 900, thereby improving the ability to resist interference between the flexible circuit board 310 and the fixing tape 900.

[0067] In addition, in this embodiment, the pasting area 314 can also be pasted on the front and back sides of the back panel 100 at the same time, which has the same effect as the pasting area 314 being pasted on the front or back side of the back panel 100 alone, and will not be described in detail here.

[0068] As an optional implementation, the light emitting body 320 is in contact with the incident surface.

[0069] In this embodiment, the illuminant 320 is arranged on the side of the light guide plate 200, so that the light emitted by the illuminant 320 passes through the incident surface located on the side of the light guide plate 200. The smaller the distance between the illuminant 320 and the incident surface of the light guide plate 200, the higher the light entry efficiency of the light entering the light guide plate 200. By making the illuminant 320 fit the incident surface, the light emitted by the illuminant 320 can directly enter the incident surface, which greatly improves the light entry efficiency. At the same time, since the flexible circuit board 310 for supporting and setting the illuminant 320 has a first connection area 311 attached to the bottom of the incident surface, the first connection area 311 and the illuminant fixing area 312 of the flexible circuit board 310 can move synchronously with the light guide plate 200, that is, the illuminant 320 can move synchronously with the incident surface on the light guide plate 200, which can ensure that the distance between the illuminant 320 and the incident surface on the light guide plate 200 is fixed, while improving the light entry efficiency, it can also avoid the occurrence of bad lamp shadow.

[0070] As an optional implementation, a reflective plate 500 is provided between the back plate 100 and the light guide plate 200 , and an optical film group 600 is provided on a side of the light guide plate 200 away from the front side of the back plate 100 .

[0071] In this embodiment, by disposing the reflection plate 500 between the back plate 100 and the light guide plate 200 , the light can be reflected to the exit surface of the light guide plate 200 by the reflection plate 500 , thereby improving the utilization rate of the light.

[0072] The optical film set 600 is arranged on the exit surface of the light guide plate 200 to adjust the light emitted from the exit surface of the light guide plate 200 and transmit the adjusted light to the display panel. Optionally, the optical film set 600 may include a diffuser 610, a prism sheet 620, and a brightness enhancement sheet, etc., and an appropriate optical film set 600 may be selected according to design requirements.

[0073] As an optional implementation, Figure 4 and Figure 5 As shown, the back plate 100 includes a frame 110 folded to the top of the light guide plate 200, and the back plate 100 is provided with a through hole so that the flexible circuit board 310 passes through the through hole and is folded to the back of the back plate 100. The edge-type backlight module also includes:

[0074] A reflective film 700, wherein a first portion of the reflective film 700 is disposed on a side of the frame 110 adjacent to the light emitter 320, and a second portion of the reflective film 700 is disposed between the optical film set 600 and the light guide plate 200; and,

[0075] The light shielding film 800 , wherein the first portion of the light shielding film 800 is disposed on a side of the frame 110 away from the light emitting body 320 , and the second portion of the light shielding film 800 is disposed between the optical film set 600 and the display panel.

[0076] In this embodiment, the reflective film 700 can be attached to the bottom of the frame 110 and the bottom of the optical film group 600 through the adhesive layer on its upper surface. By setting the reflective film 700, the light emitted by the light emitting body 320 to the area is reflected back to the light emitting body 320 area, and then the light enters the incident surface of the light guide plate 200, so as to improve the utilization efficiency of the light. In addition, by setting the reflective film 700, light leakage in the area can also be avoided. Further optionally, the reflective film 700 is a U-fold reflective film 700, which is located on the upper side of the light emitting body 320 and attached to the U-fold formed there, which can play the effect of shielding and reflecting the light beam or light shadow of the light emitting body 320.

[0077] In this embodiment, the light shielding film 800 can cover the connecting area between the frame 110 and the optical film group 600, which can effectively avoid light leakage defects in the connecting area, and can also achieve the effect of improving the light beam of the light emitting body 320 and pasting the backlight module film material. Figure 4 and Figure 5 As shown, a display panel is also provided above the shading film 800 of the frame 110, and the edge-entry backlight module and the display panel are fixed by a fixing tape 900. The display panel includes a glass substrate 1100 and a glass cover plate 1200 arranged in sequence, and the glass substrate 1100 and the glass cover plate 1200 are supported by the frame 110.

[0078] As an optional implementation, Figure 4 and Figure 5 As shown, the optical film set 600 includes a diffuser 610 , and a support is provided on a side of the diffuser 610 that overlaps with the reflective film 700 and is away from the reflective film 700 , and the support is adhered to the diffuser 610 .

[0079] In this embodiment, the support plate 611 can be made of polyethylene terephthalate (PET), and the support plate 611 is arranged in the overlapping area of ​​the diffuser 610 and the reflective film 700, so as to compensate for the U-fold step difference in the area. Figure 4 and Figure 5 As shown, the gap between the glass substrate 1100 and the reflective film 700 is filled to reduce the occurrence of broken pieces.

[0080] Based on the same inventive concept, the embodiment of the present application further provides a display device, which includes the above-mentioned light bar 300 or the above-mentioned edge-type backlight module. Figure 4 and Figure 5 As shown, the display device further includes a display panel, and the display panel is arranged on the light-emitting side of the edge-type backlight module. In this embodiment, the display device can be a tablet computer, and can also be other liquid crystal display devices.

[0081] Since the display device provided by the present invention includes the edge-entry backlight module of the above technical solution, the display device provided by the present invention has all the beneficial effects of the above edge-entry backlight module, which will not be described in detail here.

[0082] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0083] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0084] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0085] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0086] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0087] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0088] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0089] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A side-lit backlight module, characterized in that: The edge-type backlight module comprises: A back panel, including a front side of the back panel and a back side of the back panel; a light guide plate, arranged on the front side of the back plate, the light guide plate comprising at least one incident surface and an exit surface connected to the incident surface; and A light bar, the light bar comprising a light board connected to the light guide plate, a light emitter arranged on the light board, and a flexible circuit board connected between the light board and a main control circuit board, or the light bar comprising a flexible circuit board connected between the light guide plate and the main control circuit board and a light emitter arranged on the flexible circuit board, the light bar being connected to the bottom surface of the light guide plate through the light board or the flexible circuit board so that the light emitter is opposite to the incident surface; The flexible circuit board comprises: A folding buffer, the folding buffer is located between the light-emitting body and the main control circuit board; the folding buffer comprises folding protrusions connected in sequence, and the folding protrusions can be switched between a compressed state and an extended state; the compression and extension margin of the folding buffer is greater than or equal to the expansion and contraction margin of the light guide plate; when the folding protrusion of the folding buffer is in a compressed state, the maximum height of the folding protrusion is less than the height of the light-emitting body; the folding buffer is located on the front side of the back plate; a first connection area, the first connection area being connected to the light board or the light guide plate; a second connection area, the second connection area being connected to the main control circuit board, and A pasting area, located between the folding buffer area and the second connecting area, the pasting area is connected to the back plate, and the pasting area is pasted on the back side of the back plate and / or the front side of the back plate; The back plate includes a frame body folded over the light guide plate, and the back plate is provided with a through hole so that the flexible circuit board can pass through the through hole and be folded over to the back side of the back plate.

2. The edge-lit backlight module according to claim 1, wherein: The distance between the folding buffer zone and the edge of the back plate is 0.3±0.1 mm.

3. The edge-lit backlight module according to claim 1 or 2, characterized in that: The light emitting body is in contact with the incident surface.

4. The edge-lit backlight module according to claim 3, wherein: A reflective plate is arranged between the back plate and the light guide plate; and an optical film group is arranged on a side of the light guide plate away from the front side of the back plate.

5. The edge-lit backlight module according to claim 4, wherein: The edge-type backlight module also includes: a reflective film, wherein a first portion of the reflective film is disposed on a side of the frame body adjacent to the light emitter, and a second portion of the reflective film is disposed between the optical film sheet group and the light guide plate; and, A light shielding film, wherein a first portion of the light shielding film is arranged on a side of the frame away from the light emitting body, and a second portion of the light shielding film is arranged between the optical film group and the display panel.

6. The edge-lit backlight module according to claim 5, wherein: The optical film set comprises a diffusion sheet, and a support plate is provided on a side of the diffusion sheet and away from the reflection film in the overlapping area of ​​the diffusion sheet and the reflection film, and the support plate is adhered to the diffusion sheet.

7. A display device, characterized in that: The display device comprises the edge-type backlight module as described in any one of claims 1 to 6.

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