Display module

Abstract

The utility model relates to a display module which comprises a backlight module and a display panel located on the light emitting side of the backlight module, the display panel comprises a binding side located on one side of the display panel in the first direction, the binding side is connected with a flexible circuit board in a binding mode, the backlight module comprises a back plate, and the flexible circuit board is connected with the back plate in a binding mode. A main circuit board is arranged on the side, away from the display panel, of the back plate, the flexible circuit board is bent to the backlight side of the display module so as to be electrically connected with the main circuit board, the back plate comprises a bottom plate, a first side plate and a bending area located between the bottom plate and the first side plate, and the first side plate is electrically connected with the main circuit board. The bottom plate is located on the backlight side of the display panel, the bending area enables the first side plate to be located on the binding side, and a protection structure is arranged on the side, away from the center of the bottom plate, of the bending area.

Description

Technical Field

[0001] The utility model relates to the technical field of display product manufacturing, and in particular to a display module. Background Art

[0002] With the rapid development of electronic products and the IT industry, thinness and lightness have become the development trend of NB display products (display modules for laptops). However, while demanding thinness and lightness, customers also have very stringent requirements on the strength of display products. Therefore, some new problems that arise in products with thinness and lightness and high strength requirements require new solutions. Among them, short circuits in wiring during assembly have become a problem that needs to be solved and avoided in product development.

[0003] The trend of thinner and lighter display modules in current laptops has led to the widespread use of aluminum backplanes in display modules. In order to meet the high-strength requirements of narrow-framed mid-to-high-end IT products and enhance product competitiveness, the thickness of the aluminum backplane has been increased. However, when the thickness of the aluminum backplane increases, the backplane will crack during the U-fold stamping, and there will be roughness or even burrs caused by the cracks in the crease area. When paired with a green-oil FPC, the burrs will scratch the green oil layer of the green-oil FPC, resulting in a flickering screen when the FPC traces come into contact with the backplane. Utility Model Content

[0004] In order to solve the above technical problems, the present invention provides a display module to solve the problem of damage to the flexible circuit board caused by cracks in the bending area of the back panel.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted in the embodiment of the present invention is as follows: a display module, comprising a backlight module and a display panel located on the light-emitting side of the backlight module, wherein the display panel comprises a binding side located on one side of the display panel in a first direction, wherein the binding side is bound and connected to a flexible circuit board, wherein the backlight module comprises a back plate, wherein a main circuit board is provided on a side of the back plate away from the display panel, wherein the flexible circuit board is bent to the backlight side of the display module to be electrically connected to the main circuit board,

[0006] The back panel includes a bottom panel, a first side panel, and a bending area between the bottom panel and the first side panel. The bottom panel is located on the backlight side of the display panel. The bending area enables the first side panel to be located on the binding side. A protective structure is provided on the side of the bending area away from the center of the bottom panel.

[0007] Optionally, the protective structure is an insulating adhesive layer attached to the back plate, and in a second direction perpendicular to the first direction, the width of the insulating adhesive layer is greater than the width of the flexible circuit board.

[0008] Optionally, the thickness of the insulating rubber layer 4 is 0.03-0.05 mm.

[0009] Optionally, the difference between the width of the insulating adhesive layer in the second direction and the width of the flexible circuit board 3 is 2 to 6 mm.

[0010] Optionally, the insulating adhesive layer includes a first portion located on the bottom plate and a second portion located on the first side plate, and the length of the first portion in the first direction is 10 to 20 mm.

[0011] Optionally, it also includes a plastic frame arranged around the periphery of the back panel, an adhesive layer is arranged between the plastic frame and the back panel, the plastic frame includes a first side wall located on the binding side, a groove is arranged on the side of the first side wall away from the back panel to form a avoidance space for the flexible circuit board, and the first side wall is reused as the protective structure.

[0012] Optionally, the width of the slot in the second direction is greater than the width of the flexible circuit board in the second direction, and the difference between the width of the slot in the second direction and the width of the flexible circuit board in the second direction is 2 to 6 mm.

[0013] Optionally, in a direction perpendicular to the bottom plate, an end surface of the first side wall close to the bottom plate is flush with a surface of the bottom plate away from the display panel.

[0014] Optionally, the plastic frame further includes a bottom wall located on the bottom plate, and in the first direction, the length of the bottom wall is 5 to 10 mm, and the thickness of the bottom wall is 0.3 to 0.5 mm.

[0015] Optionally, it also includes a light strip located on the side of the base plate close to the display panel, the light strip includes a light strip flexible circuit board and lamp beads located on the light strip flexible circuit board, a first opening is provided on the first side panel, and a second opening is provided on the plastic frame, the first opening and the second opening correspond to each other for the light strip flexible circuit board to pass through.

[0016] Optionally, the thickness of the back plate is 0.4-0.5 mm.

[0017] The beneficial effect of the present invention is that a protective structure is provided on a side of the bending area of the back plate away from the center of the bottom plate to prevent damage to the flexible circuit board. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A schematic diagram showing the backlight side of a display module in an embodiment of the present invention;

[0019] Figure 2A schematic diagram showing a display module in an embodiment of the present invention;

[0020] Figure 3 A partial schematic diagram showing a back plate in an embodiment of the present utility model;

[0021] Figure 4 A schematic diagram showing the backlight side of a display module in an embodiment of the present invention;

[0022] Figure 5 A schematic diagram showing a display module in an embodiment of the present invention;

[0023] Figure 6 A schematic diagram showing the backlight side of a display module in an embodiment of the present invention;

[0024] Figure 7 A side view schematically shows a display module in an embodiment of the present invention;

[0025] Figure 8 A partial schematic diagram showing a display module in an embodiment of the present invention;

[0026] Figure 9 A partial schematic diagram showing a display module in an embodiment of the present invention;

[0027] Figure 10 A partial schematic diagram of the back plate in an embodiment of the present invention is shown. DETAILED DESCRIPTION

[0028] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the described embodiments of the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0029] Unless otherwise defined, the technical or scientific terms used in this disclosure should have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar words used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one", "an" or "the" do not indicate a quantity limitation, but rather indicate the existence of at least one. Words such as "include" or "comprise" mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0030] As used in the embodiments of the present disclosure, the terms "parallel," "perpendicular," and "identical" include the strict sense of "parallel," "perpendicular," and "identical," as well as "approximately parallel," "approximately perpendicular," and "approximately identical" with respect to a certain tolerance, which, taking into account the tolerances associated with the measurement of a particular quantity (e.g., limitations of the measurement system), means within an acceptable range of deviation for a particular value as determined by one of ordinary skill in the art. For example, "approximately" can mean within one or more standard deviations, or within 3% or 5% of the stated value.

[0031] In order to achieve the thinness and lightness of NB display products (display modules for laptops), an aluminum backplane is used in the display module. When the overall strength of the display module needs to be improved, the thickness of the backplane is increased. Similarly, due to the heavy influence of COG Mura (the phenomenon of uneven visual effects caused by pixel differences in local areas near the driver chip in LCD displays), a green-oil FPC design with lower resilience is used in narrow-frame products. However, when the thickness of the aluminum backplane increases, the backplane will crack when punching the U-fold, and then there will be roughness or even burrs caused by the cracks in the crease area. When paired with a green-oil FPC, the green-oil layer of the green-oil FPC will be scratched, resulting in a short circuit between the wiring and the backplane. When not squeezed, the display is normal, which is manifested as a flickering screen.

[0032] refer to Figure 1-Figure 7 In response to the above problems, the present application provides a display module to solve the problem that cracks generated in the bending area of the back plate 1 scratch the FPC due to the increase in the thickness of the back plate 1.

[0033] Specifically, this embodiment provides a display module, including a backlight module and a display panel, wherein the backlight module is used to provide a light source to the display panel 2, and the display panel 2 includes a first direction (reference Figure 1 The binding side is located on one side of the display panel 2 in the X direction (in the X direction), and the binding side is bound and connected with the flexible circuit board 3.

[0034] The backlight module includes a backplane 1 . A main circuit board 10 is provided on a side of the backplane 1 away from the display panel 2 . The flexible circuit board 3 is bent to the backlight side of the display module to be electrically connected to the main circuit board 10 .

[0035] The back panel 1 includes a bottom panel 11, a first side panel 12, and a bending area between the bottom panel 11 and the first side panel 12. The bottom panel 11 is located on the backlight side of the display panel 2. The bending area makes the first side panel 12 located on the binding side. A protective structure is set on the side of the bending area away from the center of the bottom panel 11.

[0036] The display panel 2 is connected to a flexible printed circuit board 3 on the binding side. The flexible printed circuit board 3 bends to the backlight side of the display panel 2 and connects to the main circuit board 10. To increase the flexibility of the single-layer bending area at the lower end of the binding of the flexible printed circuit board 3 and reduce the rebound force after the flexible printed circuit board 3 is bent, the insulating protective layer in the bending area of the FPC is made of green grease, referred to as green grease FPC. The insulating protective layer can also be made of PI. Compared to FPCs using PI as the insulating protective layer, green grease FPC has better flexibility and is very effective in addressing L0 light leakage. Therefore, green grease FPC is also a must-have design for products with high light leakage resistance. However, compared to FPCs using PI as the insulating protective layer, green grease FPC is more susceptible to scratching. In products where the FPC is bent to the backlight side of the backplane and electrically connected to the main circuit board located on the backlight side of the backplane, scratches on the green grease can cause short circuits between the traces on the FPC and the backplane 1. For example, scratches on the functional line or lock line on the FPC will cause a short circuit. The Lock line is used to transmit the Lock signal, a level signal, and feedback the S-IC status. When the Lock line is pulled Low, the T-con stops outputting data, resulting in a black screen.

[0037] To address the above problem, in this embodiment, a protective structure is provided in the bending area of the backplane 1, that is, a protective structure is provided between the flexible circuit board 3 and the backplane 1, thereby preventing the flexible circuit board 3 from being scratched and protecting the flexible circuit board 3.

[0038] It should be noted that the back panel 1 includes a bottom panel 11, and side panels are arranged around the bottom panel 11 to form a storage space for accommodating the backlight assembly, wherein the first side panel 12 is correspondingly provided on the binding side. In some embodiments, on the binding side, the first side panel 12 is bent toward the center of the bottom panel 11 to form a first top panel 13, and the first top panel 13, the first side panel 12, and the bottom panel 11 form a U-shaped structure. The first top plate 13 can support the display panel 2. There will also be cracks in the bending area between the first top plate 13 and the first side plate 12, but the bending area between the first top plate 13 and the first side plate 12 corresponds to the bending area of the flexible circuit board 3. The bending curvature of the flexible circuit board 3 will avoid the bending area between the first top plate 13 and the first side plate 12, and a Panel Spacer (spacer protective layer 5) is also provided on the first top plate 13. The spacer protective layer 5 completely covers the first top plate 13 and also protects the flexible circuit board 3. Therefore, the location where the flexible circuit board 3 is scratched is mainly in the bending area between the bottom plate 11 and the first side plate 12.

[0039] Illustratively, the thickness of the back plate 1 in this embodiment is 0.4-0.5 mm.

[0040] refer to Figure 1-Figure 3 , Figure 2 for Figure 1 In the AA-direction cross-sectional diagram of FIG, in an exemplary embodiment, the protective structure is an insulating adhesive layer 4 attached to the back plate 1. The insulating adhesive layer 4 can be an insulating tape having an adhesive layer on one side, and the base layer of the insulating tape is made of PET (Polyethylene terephthalate) material.

[0041] In an exemplary embodiment, the thickness of the insulating adhesive layer 4 is 0.03-0.05 mm.

[0042] In an exemplary embodiment, the insulating adhesive layer 4 is attached to the bending area of the back panel and has an L-shaped structure. The insulating adhesive layer 4 includes a first part located on the bottom plate 11 of the back panel and a second part located on the first side plate 12 of the back panel 1. The length of the first part in the first direction is 10 to 20 mm to effectively prevent the flexible circuit board 3 from directly contacting the back panel 1 and causing damage.

[0043] In an exemplary embodiment, in a second direction perpendicular to the first direction (reference Figure 1In the Y direction), the width of the insulating adhesive layer 4 is greater than the width of the flexible circuit board 3, and when the flexible circuit board 3 is in a bent state, both ends of the insulating adhesive layer 4 in the second direction are exposed from the flexible circuit board 3.

[0044] refer to Figure 3 , Figure 3 The figure shows a portion of the bottom plate 11 and a portion of the first side plate 12 . In the second direction, the flexible circuit board 3 is located in the middle area of the insulating adhesive layer 4 .

[0045] By adopting the above solution, when the flexible circuit board 3 is in a bent state, the orthographic projection of the first area of the flexible circuit board 3 superimposed on the insulating adhesive layer 4 is completely located on the insulating adhesive layer 4, effectively isolating the flexible circuit board 3 from the backplane 1 and preventing the flexible circuit board 3 from being scratched by cracks in the bent area.

[0046] Illustratively, the difference between the width of the insulating adhesive layer 4 in the second direction and the width of the flexible circuit board 3 is 2 to 6 mm, but is not limited thereto.

[0047] In an exemplary embodiment, in the second direction, the insulating adhesive layer 4 has a first center line, and the flexible circuit board 3 has a second center line. The midpoint of the first center line corresponds to the midpoint of the second center line, that is, the orthographic projection of the midpoint of the second center line on the insulating adhesive layer 4 coincides with the midpoint of the first center line, effectively ensuring that both ends of the insulating adhesive layer 4 in the second direction are exposed to the flexible circuit board 3.

[0048] In an exemplary embodiment, in the second direction, the binding side of the display panel 2 is bound and connected to at least one flexible circuit board 3, and the bending area of the back panel 1 is provided with at least one insulating adhesive layer 4, and at least one insulating adhesive layer 4 is provided in a one-to-one correspondence with at least one flexible circuit board 3.

[0049] refer to Figures 4-10 , Figure 5 for Figure 4 BB cross-sectional schematic diagram, in an exemplary embodiment, the backlight module also includes a plastic frame 9 arranged around the periphery of the back panel 1, and the plastic frame 9 includes a first side wall 91 located on the binding side, and a groove 911 is provided on a side of the first side wall 91 away from the back panel 1 to form an avoidance space for the flexible circuit board 3. The first side wall 91 is reused as the protective structure, which effectively isolates the back panel 1 and the flexible circuit board 3 to prevent cracks on the back panel 1 from scratching the flexible circuit board 3.

[0050] In an exemplary embodiment, in a second direction perpendicular to the first direction, the width of the slot 911 is greater than the width of the flexible circuit board 3 , effectively preventing the flexible circuit board 3 from being scratched by the back plate 1 .

[0051] Figure 10 The figure shows a portion of the first side wall 91 and a portion of the bottom wall 92 . In the second direction, the width of the flexible circuit board is smaller than the width of the slot 911 , and the flexible circuit board 3 is located in the middle area of the slot 911 .

[0052] Exemplarily, the difference between the width of the slot 911 in the second direction and the width of the flexible circuit board 3 in the second direction is 2 to 6 mm, but is not limited thereto.

[0053] Exemplarily, when the flexible circuit board 3 is in a bent state, the slot 911 has a third center line extending along the second direction, and the flexible circuit board 3 has a second center line extending along the second direction. The orthographic projection of the midpoint of the second center line on the slot 911 coincides with the midpoint of the third center line, effectively ensuring that the flexible circuit board 3 is located in the slot 911.

[0054] In an exemplary embodiment, the end surface of the first side wall 91 close to the bottom plate 11 is flush with the side of the bottom plate 11 away from the display panel 2, effectively preventing the flexible circuit board 3 from contacting the bending area and preventing the flexible circuit board 3 from being scratched.

[0055] It should be noted that the reference Figure 4 The adhesive frame and the back plate 1 are connected by an adhesive layer 20, and the adhesive layer 20 has a certain thickness. Figure 5 In the embodiment, one end of the first side wall 91 away from the display panel is exposed from the first side plate 12 , that is, the length of the first side wall 91 is greater than the length of the first side plate 12 .

[0056] In an exemplary embodiment, the plastic frame includes a bottom wall 92 connected to a side of the bottom plate 11 away from the display panel 2 . In the first direction, the length of the bottom wall 92 is 5 to 10 mm, but is not limited thereto.

[0057] For example, the plastic frame is an integral structure including a bottom wall 92 and side walls surrounding the bottom wall 92, wherein the side walls include the first side wall 91 located on the binding side. The plastic frame can be made of insulating PP material, but is not limited thereto.

[0058] Exemplarily, the thickness of the bottom wall 92 is 0.3-0.5 mm, but is not limited thereto.

[0059] Exemplarily, a main circuit board 10 is provided on the side of the base plate 11 away from the display panel 2. In the second direction, the width of the bottom wall 92 matches the width of the main circuit board 10, protecting the flexible circuit board 3 while avoiding interference with the system assembly.

[0060] In an exemplary embodiment, the plastic frame and the back plate 1 are fixedly connected via an adhesive layer.

[0061] The provision of the plastic frame can not only prevent the flexible circuit board 3 from being scratched by the back plate 1 , but can also effectively prevent the flexible circuit board 3 from being damaged by the impact force from the side.

[0062] In an exemplary embodiment, the backlight module further includes a light bar 6 located on a side of the bottom plate 11 near the display panel 2. The light bar 6 includes a light bar flexible circuit board 100 and lamp beads located on the light bar flexible circuit board 100. The lamp beads may be, for example, light-emitting diodes (LEDs). The first side plate 12 is provided with a first opening, and the plastic frame is provided with a second opening 912. The first opening and the second opening 912 correspond to each other, allowing the circuit board of the light bar 6 to pass through and connect to the main circuit board 10.

[0063] The backlight module in this embodiment is a direct-lit backlight module. The light bar 6 is located on the bottom plate 11 , and the light-emitting surfaces of the lamp beads are arranged facing the bottom surface of the light guide plate 7 .

[0064] In an exemplary embodiment, the backlight module includes a light guide plate 7 disposed on the bottom plate 11 , and an optical film 8 is disposed on the light-emitting side of the light guide plate 7 .

[0065] The optical film 8 may comprise a multi-layer structure. For example, the optical film may comprise a diffuser and a prismatic film sequentially stacked on the light guide plate 7. The diffuser is used to disperse light emitted from the front of the light guide plate 7, so that the light is evenly directed toward the display panel 2, thereby improving the brightness uniformity of the display panel 2; the prismatic film can converge light emitted from the diffuser at various angles onto an axial angle (the normal viewing angle of the display panel 2), thereby improving the axial brightness of the display panel 2.

[0066] For example, two layers of prism films can be stacked on the diffuser. In the planar direction of the display panel 2, the extension directions of the prisms on the two layers of prism films can be inconsistent. For example, the extension directions of the prisms on the two layers of prism films are perpendicular to each other, so as to converge light from different directions, which can enhance the light convergence effect of the prism film and enhance the axial brightness of the display panel 2.

[0067] The display module provided in this embodiment can be applied to any product or component with a display function, such as LCD TVs, LCD monitors, digital photo frames, mobile phones, and tablet computers.

[0068] There are a few points to note:

[0069] (1) The drawings of the embodiments of the present disclosure only relate to the structures related to the embodiments of the present disclosure. Other structures may refer to conventional designs.

[0070] (2) For the sake of clarity, the thickness of layers or regions in the drawings used to describe the embodiments of the present disclosure are exaggerated or reduced, i.e., these drawings are not drawn to scale. It is understood that when an element such as a layer, film, region, or substrate is referred to as being "on" or "under" another element, the element may be "directly" "on" or "under" the other element or intervening elements may be present.

[0071] (3) In the absence of conflict, the embodiments of the present disclosure and the features therein may be combined with each other to form new embodiments.

[0072] It is understood that the above embodiments are merely exemplary embodiments for illustrating the principles of the present invention, and the present invention is not limited thereto. Those skilled in the art may make various modifications and improvements without departing from the spirit and substance of the present invention, and such modifications and improvements are also considered to be within the scope of protection of the present invention.

Claims

1. A display module comprising a backlight module and a display panel located on a light-emitting side of the backlight module, wherein the display panel comprises a binding side located on one side of the display panel in a first direction, the binding side being bound and connected to a flexible circuit board, the backlight module comprising a backplane, a main circuit board being provided on a side of the backplane away from the display panel, the flexible circuit board being bent to the backlight side of the display module to be electrically connected to the main circuit board, characterized in that: The back panel includes a bottom panel, a first side panel, and a bending area between the bottom panel and the first side panel. The bottom panel is located on the backlight side of the display panel. The bending area enables the first side panel to be located on the binding side. A protective structure is provided on the side of the bending area away from the center of the bottom panel.

2. The display module according to claim 1, wherein: The protection structure is an insulating adhesive layer attached to the back plate. In a second direction perpendicular to the first direction, the width of the insulating adhesive layer is greater than the width of the flexible circuit board.

3. The display module according to claim 2, wherein: The thickness of the insulating rubber layer is 0.03-0.05 mm.

4. The display module according to claim 2, wherein: The difference between the width of the insulating adhesive layer in the second direction and the width of the flexible circuit board is 2 to 6 mm.

5. The display module according to claim 2, wherein: The insulating adhesive layer includes a first portion located on the bottom plate and a second portion located on the first side plate. The length of the first portion in the first direction is 10 to 20 mm.

6. The display module according to claim 1, wherein: It also includes a plastic frame arranged around the periphery of the back panel, an adhesive layer is arranged between the plastic frame and the back panel, the plastic frame includes a first side wall located on the binding side, a groove is arranged on a side of the first side wall away from the back panel to form a avoidance space for the flexible circuit board, and the first side wall is reused as the protective structure.

7. The display module according to claim 6, wherein: The width of the slot in a second direction perpendicular to the first direction is greater than the width of the flexible circuit board in the second direction, and the difference between the width of the slot in the second direction and the width of the flexible circuit board in the second direction is 2 to 6 mm.

8. The display module according to claim 6, wherein: In a direction perpendicular to the bottom plate, an end surface of the first side wall close to the bottom plate is flush with a surface of the bottom plate away from the display panel.

9. The display module according to claim 6, wherein: The plastic frame further includes a bottom wall located on the bottom plate. In the first direction, the length of the bottom wall is 5 to 10 mm, and the thickness of the bottom wall is 0.3 to 0.5 mm.

10. The display module according to claim 6, wherein: It also includes a light bar located on the side of the bottom plate close to the display panel, the light bar including a light bar flexible circuit board and lamp beads located on the light bar flexible circuit board, a first opening is provided on the first side panel, and a second opening is provided on the plastic frame, the first opening and the second opening correspond to each other for the light bar flexible circuit board to pass through.

11. The display module according to claim 1, wherein: The thickness of the back plate is 0.4-0.5 mm.

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