Backlight module capable of avoiding light leakage
By setting frame-shaped black light-blocking double-sided tape and black single-sided adhesive at the clearance of the backlight module, combined with the baffle and twisted foot structure of the base plate, the light leakage problem of the backlight module was solved, ensuring the overall lighting effect of the LCD screen.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-18
- Publication Date
- 2026-03-20
AI Technical Summary
Light leakage is prone to occur in the gaps at the FPC lead-out position of the backlight module, affecting the overall lighting effect of the LCD screen.
The gap is covered with frame-shaped black light-blocking double-sided tape, and black single-sided adhesive is placed on top of it. The black single-sided adhesive extends outward and bends to cover the outer side of the backlight adhesive frame and the lower iron frame. At the same time, a retaining wall and a twist foot are set under the base plate to fix the PCB board.
This effectively prevents light leakage through gaps at the FPC lead-out points of the display screen, ensuring the overall lighting effect of the LCD screen.
Smart Images
Figure CN224020117U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display technology, and more specifically, to a backlight module that avoids light leakage. Background Technology
[0002] To prevent light leakage from the backlight module when it is lit, black double-sided adhesive tape is typically used to attach the backlight module to the backlight frame. The backlight frame is designed with a gap at the FPC (Flexible Printed Circuit) lead-out point to allow the FPC to extend normally and avoid interference with the FPC if the frame is present. However, if the effective width of the black double-sided adhesive tape bonding the backlight frame at the lead-out point is less than 0.5mm (meaning the frame's border is too narrow), the adhesive may not adhere properly, resulting in gaps. This can cause light leakage from the side of the lead-out point, affecting the overall lighting performance of the LCD screen. Utility Model Content
[0003] The technical problem to be solved by this utility model is how to avoid light leakage through the gaps at the lead-out position of the display screen FPC and ensure the overall lighting effect of the LCD screen.
[0004] The technical problem to be solved by this utility model is achieved through the following technical solution:
[0005] To solve the above-mentioned technical problems, this utility model provides a backlight module that avoids light leakage, which includes a lower iron frame, a reflective sheet, a light guide plate, an optical film assembly, and a backlight adhesive frame. The lower iron frame includes a base plate and a side wall extending upward from the edge of the base plate. The reflective sheet is disposed on the base plate. The light guide plate is disposed on the reflective sheet. The optical film assembly is disposed on the light guide plate. The backlight adhesive frame is disposed on the base plate and covers the side wall. The backlight adhesive frame is frame-shaped. The backlight adhesive frame has a clearance notch at the lead-out point of the display FPC. A frame-shaped black light-shielding double-sided adhesive is disposed on the upper surface of the backlight adhesive frame, which covers the clearance notch. A black single-sided adhesive is disposed above the frame-shaped black light-shielding double-sided adhesive at the clearance notch. The black single-sided adhesive extends outward and bends to cover the outer side of the backlight adhesive frame and the lower iron frame.
[0006] As a preferred embodiment of the backlight module for preventing light leakage provided by this utility model, the thickness of the black single-sided adhesive is 0.03mm-0.05mm.
[0007] As a preferred embodiment of the backlight module that avoids light leakage provided by this utility model, the effective adhesive width of the backlight adhesive frame located at the avoidance notch is less than 0.5mm.
[0008] As a preferred embodiment of the backlight module for avoiding light leakage provided by this utility model, a PCB board is provided below the base plate. At least one baffle is stamped on the top and bottom of the lower surface of the base plate. The baffle is perpendicular to the base plate. At least one toggle foot is stamped on the left and right sides of the lower surface of the base plate. The toggle foot is rotatable. The PCB board is placed in the space defined by the baffle and the toggle foot.
[0009] As a preferred embodiment of the backlight module for preventing light leakage provided by this utility model, the width of the barrier is 8mm to 12mm, and the assembly gap between the barrier and the PCB board is 0.3mm to 0.5mm.
[0010] As a preferred embodiment of the backlight module for avoiding light leakage provided by this utility model, the cross-sectional shape of the toggle foot is L-shaped, and the toggle foot includes a root connected to the base plate and a toggle part connected to the root.
[0011] As a preferred embodiment of the backlight module for preventing light leakage provided by this utility model, the root width of the twisted foot is 4mm to 6mm, and the width of the twisted part of the twisted foot is 4mm to 6mm.
[0012] As a preferred embodiment of the backlight module for avoiding light leakage provided by this utility model, an inner recess is provided at the connection between the root and the inner side of the twist.
[0013] As a preferred embodiment of the backlight module for avoiding light leakage provided by this utility model, the concave portion has a smooth transition.
[0014] As a preferred embodiment of the backlight module for avoiding light leakage provided by this utility model, the depth of the concave portion is 0.5mm to 1.0mm, and the distance between the deepest point of the concave portion and the lower surface of the root portion is 1.5mm to 2.5mm.
[0015] This utility model has the following beneficial effects:
[0016] Because the frame-shaped black light-blocking double-sided tape has a black single-sided adhesive on top, and the black single-sided adhesive extends outward and bends to cover the outer side of the backlight adhesive frame and the lower iron frame, the black single-sided adhesive can be fixed very firmly, avoiding gaps at the FPC lead-out position of the display screen and light leakage, thus ensuring the overall lighting effect of the LCD screen. Attached Figure Description
[0017] To more clearly illustrate the solutions in this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a structural schematic diagram of a backlight module that avoids light leakage, provided by this utility model.
[0019] Figure 2 for Figure 1 A schematic diagram showing the structure after concealing the black light-blocking double-sided tape and the black single-sided adhesive.
[0020] Figure 3 for Figure 1 Side view.
[0021] Figure 4 for Figure 3 Enlarged view of point A in the middle.
[0022] Figure 5 This is a schematic diagram of the improved structure of the lower iron frame.
[0023] Figure 6 for Figure 5 A bottom view.
[0024] Figure 7 for Figure 5 Enlarged view of point B in the middle.
[0025] Explanation of icon numbers:
[0026] 1. Lower iron frame; 2. Reflective sheet; 3. Light guide plate; 4. Optical film assembly; 5. Backlight adhesive frame; 11. Base plate; 12. Side wall; 51. Avoidance notch; 6. Black light-shielding double-sided adhesive; 7. Black single-sided adhesive.
[0027] 13. Retaining wall; 14. Twist; 141. Root; 142. Twist; 143. Concave part. Detailed Implementation
[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.
[0029] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0030] Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0031] This utility model provides a backlight module to avoid light leakage, which includes a lower iron frame, a reflective sheet, a light guide plate, an optical film assembly, and a backlight adhesive frame. The lower iron frame includes a base plate and a side wall extending upward from the edge of the base plate. The reflective sheet is disposed on the base plate. The light guide plate is disposed on the reflective sheet. The optical film assembly is disposed on the light guide plate. The backlight adhesive frame is disposed on the base plate and covers the side wall. The backlight adhesive frame is frame-shaped. The backlight adhesive frame has a clearance notch at the lead-out point of the display FPC. A frame-shaped black light-shielding double-sided adhesive is disposed on the upper surface of the backlight adhesive frame, which covers the clearance notch. A black single-sided adhesive is disposed above the frame-shaped black light-shielding double-sided adhesive at the clearance notch. The black single-sided adhesive extends outward and bends to cover the outer side of the backlight adhesive frame and the lower iron frame.
[0032] Because the frame-shaped black light-blocking double-sided tape has a black single-sided adhesive on top, and the black single-sided adhesive extends outward and bends to cover the outer side of the backlight adhesive frame and the lower iron frame, the black single-sided adhesive can be fixed very firmly, avoiding gaps at the FPC lead-out position of the display screen and light leakage, thus ensuring the overall lighting effect of the LCD screen.
[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. The present invention will be described in detail below with reference to the accompanying drawings and embodiments, examples of which are shown in the drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.
[0034] Example 1, please refer to Figures 1 to 4 This utility model provides a backlight module to prevent light leakage, which includes a lower iron frame 1, a reflective sheet 2, a light guide plate 3, an optical film group 4, and a backlight adhesive frame 5. The lower iron frame 1 includes a base plate 11 and a side wall 12 extending upward from the edge of the base plate 11; the reflective sheet 2 is disposed on the base plate 11; the light guide plate 3 is disposed on the reflective sheet 2; the optical film group 4 is disposed on the light guide plate 3; the backlight adhesive frame 5 is disposed on the base plate 11 and covers the side wall 12. The backlight adhesive frame 5 is frame-shaped, and a clearance notch 51 is provided at the lead-out point of the display FPC of the backlight adhesive frame 5. A frame-shaped black light-shielding double-sided adhesive 6 is provided on the upper surface of the backlight adhesive frame 5, which covers the clearance notch 51. A black single-sided adhesive 7 is provided above the frame-shaped black light-shielding double-sided adhesive 6 located at the clearance notch 51. The black single-sided adhesive 7 extends outward and bends to cover the outer side of the backlight adhesive frame 5 and the lower iron frame 1. Because a black single-sided adhesive 7 is provided above the frame-shaped black light-blocking double-sided adhesive 6, and the black single-sided adhesive 7 extends outward and bends to cover the outer side of the backlight adhesive frame 5 and the lower iron frame 1, the black single-sided adhesive 7 can be fixed very firmly, avoiding gaps at the lead-out position of the display FPC and light leakage, and ensuring the overall lighting effect of the LCD screen.
[0035] Furthermore, the thickness of the black single-sided adhesive 7 is 0.03mm-0.05mm, and the effective adhesive width of the backlight adhesive frame 5 located at the avoidance notch 51 is less than 0.5mm. There are steps between the lower polarizer of the display module and the array substrate, so the black single-sided adhesive 7 can be hidden at the step and will not interfere with the display module.
[0036] Example 2, please refer to Figures 5 to 7As a further optimization of Embodiment 1, in this embodiment, a PCB board is provided below the base plate 11. At least one baffle 13 is stamped on the top and bottom of the lower surface of the base plate 11. The baffle 13 is perpendicular to the base plate 11. At least one toggle foot 14 is stamped on the left and right sides of the lower surface of the base plate 11. In this embodiment, there are four baffles 13, two baffles 13 are provided on the top and bottom of the base plate 11, and there are four toggle feet 14, two toggle feet 14 are provided on the left and right sides of the base plate 11. In other embodiments, the number and position of the toggle feet 14 are required to be evenly distributed to achieve the function of limiting and fixing. The toggle feet 14 can rotate, and the PCB board is placed in the space defined by the baffles 13 and the toggle feet 14. Since the bottom surface of the base plate 11 is stamped with retaining walls 13 at the top and bottom, and the bottom surface of the base plate 11 is stamped with torsion feet 14 on the left and right sides, the torsion feet 14 and retaining walls 13 are set on the base plate 11 by using a die stamping method. The PCB board is limited by the retaining walls 13 and the PCB board is fixed by rotating the torsion feet 14. The assembly reliability of the PCB board can be improved without affecting the cost and the PCB board can be prevented from falling off.
[0037] Furthermore, the width of the retaining wall 13 is 8mm to 12mm. The assembly gap between the retaining wall 13 and the PCB board is 0.3mm to 0.5mm. The height of the retaining wall 13 is the same as the thickness of the PCB board.
[0038] Furthermore, in order to enable the torsion foot 14 to best match the PCB board and bend and fix it, the cross-sectional shape of the torsion foot 14 is L-shaped. The torsion foot 14 includes a root 141 and a torsion part 142. The root 141 is connected to the base plate 11, and the torsion part 142 is connected to the root 141.
[0039] Furthermore, the root 141 of the twist foot 14 has a width of 4mm to 6mm to ensure that the root 141 has sufficient strength.
[0040] Furthermore, the width of the twisting part 142 of the twisting foot 14 is 4mm to 6mm to ensure that the twisting foot 14 has sufficient length to press onto the PCB board after being twisted, and the assembly gap between the twisting part 142 and the PCB board is 0.3mm to 0.5mm.
[0041] Furthermore, a recessed portion 143 is provided at the connection between the root portion 141 and the inner side of the twist portion 142. The recessed portion 143 has a smooth transition to avoid stress concentration.
[0042] Furthermore, the depth of the recess 143 is 0.5mm to 1.0mm, and the distance between the deepest point of the recess 143 and the lower surface of the root 141 is 1.5mm to 2.5mm. This is to avoid the problem of the twisting foot 14 breaking easily when twisting because the width at this position is too narrow. The assembly gap between the twisting foot 14 and the PCB board is 0.3mm to 0.5mm.
[0043] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0044] Obviously, the embodiments described above are only some embodiments of this application, not all embodiments. The accompanying drawings show preferred embodiments of this application, but do not limit the patent scope of this application. This application can be implemented in many different forms; rather, the purpose of providing these embodiments is to provide a more thorough and comprehensive understanding of the disclosure of this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing specific embodiments, or make equivalent substitutions for some of the technical features. Any equivalent structures made using the content of this application's specification and drawings, directly or indirectly applied to other related technical fields, are similarly within the scope of patent protection of this application.
Claims
1. A backlight module that avoids light leakage, characterized in that, It includes: The lower frame includes a base plate and sidewalls extending upward from the edge of the base plate; A reflective sheet is disposed on the base plate; A light guide plate, which is disposed on the reflective sheet; An optical film assembly is disposed on the light guide plate; A backlight mounting bracket is disposed on the base plate and covers the side wall. The backlight mounting bracket is frame-shaped and has a clearance notch at the lead-out point of the display FPC. A frame-shaped black light-blocking double-sided adhesive is disposed on the upper surface of the backlight mounting bracket, which covers the clearance notch. A black single-sided adhesive is disposed above the frame-shaped black light-blocking double-sided adhesive at the clearance notch, which extends outward and bends to cover the outer side of the backlight mounting bracket and the lower iron frame.
2. The backlight module for avoiding light leakage according to claim 1, characterized in that, The thickness of the black single-sided adhesive is 0.03mm-0.05mm.
3. The backlight module for avoiding light leakage according to claim 1, characterized in that, The effective adhesive width of the backlight adhesive frame located at the clearance notch is less than 0.5 mm.
4. The backlight module for avoiding light leakage according to claim 1, characterized in that, A PCB board is disposed below the base plate. At least one retaining wall is stamped on the top and bottom of the lower surface of the base plate. The retaining wall is perpendicular to the base plate. At least one toggle foot is stamped on the left and right sides of the lower surface of the base plate. The toggle foot is rotatable. The PCB board is placed within the space defined by the retaining wall and the toggle foot.
5. The backlight module for avoiding light leakage according to claim 4, characterized in that, The width of the retaining wall is 8mm to 12mm, and the assembly gap between the retaining wall and the PCB board is 0.3mm to 0.5mm.
6. The backlight module for avoiding light leakage according to claim 4, characterized in that, The cross-sectional shape of the toggle foot is L-shaped, and the toggle foot includes a root portion connected to the base plate and a toggle portion connected to the root portion.
7. The backlight module for avoiding light leakage according to claim 6, characterized in that, The root width of the twisted foot is 4mm to 6mm, and the width of the twisted part of the twisted foot is 4mm to 6mm.
8. The backlight module for avoiding light leakage according to claim 6, characterized in that, An indentation is provided at the connection between the root and the inner side of the twist.
9. The backlight module for avoiding light leakage according to claim 8, characterized in that, The concave portion has a smooth transition.
10. The backlight module for avoiding light leakage according to claim 8, characterized in that, The depth of the recess is 0.5 mm to 1.0 mm, and the distance between the deepest point of the recess and the lower surface of the root is 1.5 mm to 2.5 mm.