Curved surface backlight module capable of preventing light leakage

Abstract

The invention relates to the technical field of displayers, and discloses a light leakage prevention curved surface backlight module which comprises a frame, an optical component and a light source component, the frame is provided with a placing platform and a fixing cavity, and the fixing cavity is adjacent to the placing platform; the optical component is placed on the placing platform of the frame, the light source component is fixed in the fixed cavity of the frame, the light emitting side of the light source component is arranged towards the placing platform, and the light emitting side of the light source component is located on the light incident side of the optical component. According to the curved-surface backlight module, the light source component is fixed through the fixing cavity, the optical component is supported through the arrangement of the placing platform, the relative position of the light source component and the optical component can be accurately controlled, the problems of uneven brightness, light leakage and the like caused by light source deviation are effectively reduced, and the display effect of the curved-surface backlight module is improved.

Description

Technical Field

[0001] The invention relates to the technical field of displays, and in particular to a light leakage-proof curved backlight module. Background Art

[0002] With the continuous advancement of science and technology, the field of display technology has undergone profound changes. From the initial cathode ray tube (CRT) display to the widely used liquid crystal display (LCD) and the emerging organic light emitting diode (OLED) display, each technological innovation has brought users a clearer and more comfortable visual experience. Among them, the backlight module is a key component of the LCD display, and its performance directly determines the display effect of the display.

[0003] In a liquid crystal display, the liquid crystal itself does not emit light, and the backlight module is needed to provide a uniform light source to display images. Therefore, the quality of the backlight module directly affects the key indicators of the display screen, such as brightness, contrast, and color reproduction. In recent years, as consumers' requirements for display devices continue to increase, large-size, high-resolution, curved and special-shaped display screens have gradually become the mainstream of the market. This also puts higher requirements on the design and manufacture of backlight modules.

[0004] Large-size backlight modules, especially curved and special-shaped backlight modules, not only meet consumers' pursuit of visual experience, but also bring huge challenges to the production and assembly process. For curved display screens, the three main components, namely the structural parts, light guide plate, and LED light strips, can easily fail to maintain good optical elements due to process or tolerance problems, resulting in light leakage. Specifically, for LED light strips, because they are prone to displacement during the bending process, they cannot maintain the same relative position with the light guide plate, resulting in light leakage. Summary of the invention

[0005] In view of this, the present invention provides a backlight module to solve the problem of light leakage in a curved and special-shaped backlight module.

[0006] The present invention provides a light leakage-proof curved backlight module, comprising:

[0007] A frame, on which a placement platform and a fixed cavity are provided, wherein the fixed cavity is adjacent to the placement platform;

[0008] An optical component is placed on the placement platform of the frame;

[0009] The light source component is fixed inside the fixed cavity of the frame, and the light emitting side of the light source component is arranged toward the placement platform so that the light emitting window of the light source component can always be aligned with the cross-sectional size of the light incident side of the optical component.

[0010] Beneficial effects: By providing a frame with a placement platform and a fixing cavity on the frame, during installation, the optical component is placed on the placement platform of the frame, and the light source component is fixed inside the fixing cavity of the frame, and the light-emitting side of the light source component is arranged towards the placement platform. By arranging the fixing cavity adjacent to the placement platform, it is convenient to make the light-emitting side of the light source component located on the light-incident side of the optical component during installation. By fixing the light source component through the fixing cavity and providing a placement platform to support the optical component, the relative position between the light source component and the optical component can be accurately controlled, effectively reducing problems such as uneven brightness and light leakage caused by the deviation of the light source, and improving the display effect of the curved backlight module.

[0011] In an optional implementation manner, a limiting portion is provided on the side of the fixing cavity close to the placement platform, and the limiting portion is adapted to limit the side of the light source component close to the optical component.

[0012] Beneficial effects: By providing a limiting portion on the side of the fixing cavity close to the placement platform, when the light source component is inserted into the fixing cavity, the limiting portion is adapted to limit the side of the light source component close to the optical component, thereby achieving abutting fixation around the light source component to ensure the stability of the light source component inside the fixing cavity.

[0013] In an optional implementation manner, the limiting portion is a stepped surface formed by the height difference between the bottom of the fixing cavity and the upper side of the placement platform.

[0014] Beneficial effects: By constructing a specific height difference between the bottom of the fixing cavity and the upper side of the placement platform to naturally form a stepped surface. This stepped surface limiting structure is simple to process and has high stability. When the light source component is installed in the fixing cavity, the side close to the optical component will closely fit with the stepped surface, effectively restricting the displacement of the light source component in the direction close to the optical component.

[0015] In an optional implementation manner, a positioning structure is provided between the light source component and the frame structure, and the light source component is ensured to be stable in the fixing cavity through the positioning structure.

[0016] Beneficial effects: In order to comprehensively ensure the stability of the light source component in the fixing cavity and maintain an accurate relative position with the optical component, a positioning structure is carefully provided between the light source component and the frame structure in this curved backlight module. This design greatly improves the stability and reliability of the curved backlight module during production and use, ensuring high-quality output of the display effect.

[0017] In an alternative embodiment, the positioning structure includes a positioning protrusion provided on the light source portion and a positioning groove provided on the inner wall of the fixed cavity and adapted to the positioning protrusion; or

[0018] The positioning structure includes a positioning groove provided on the light source portion and a positioning protrusion provided on the inner wall of the fixed cavity and adapted to the positioning protrusion.

[0019] In an alternative embodiment, a fine-tuning device is provided on the frame, and the fine-tuning device is configured to adjust the position of the light source component in the fixed cavity.

[0020] Advantageous effects: In the actual production and application of the curved backlight module, although the positioning structure and the limiting portion can ensure the basic position of the light source component in the fixed cavity, due to inevitable tolerance problems in the production process and the influence of factors such as changes in the use environment, the relative position between the light source component and the optical component may still need to be further precisely calibrated. For this reason, a fine-tuning device is provided on the frame, and this device can finely adjust the position of the light source component in the fixed cavity, greatly improving the display performance and stability of the curved backlight module.

[0021] In an alternative embodiment, the fine-tuning device is a fine-tuning screw provided on the frame, and a fine-tuning blind hole is correspondingly provided on the light source component. The end of the fine-tuning screw abuts against the fine-tuning blind hole and adjusts the position of the light source component by rotation.

[0022] In an alternative embodiment, the fixed cavity is provided with a heat dissipation structure to dissipate heat from the light source component.

[0023] Advantageous effects: During the continuous operation of the curved backlight module, the light source component will generate a large amount of heat due to long-term operation. If this heat cannot be dissipated in time, it will cause the temperature of the light source component to be too high, which will not only reduce its luminous efficiency, cause brightness attenuation, affect the display effect of the curved backlight module, but also may shorten the service life of the light source component, and further reduce the reliability of the entire curved backlight module. To effectively solve this problem, the present invention provides a heat dissipation structure on the fixed cavity, and focuses on installing heat dissipation fins on the inner wall of the fixed cavity to achieve efficient heat dissipation of the light source component.

[0024] In an alternative embodiment, the heat dissipation structure is heat dissipation fins provided on the inner wall of the fixed cavity, and the heat dissipation fins are in contact with the light source component.

[0025] In an alternative embodiment, the light source component includes an LED lamp board and LEDs fixed on the LED lamp board. The LEDs are placed on the light incident side of the optical component; the LED lamp board is fixed inside the fixed cavity. Brief Description of the Drawings

[0026] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0027] Figure 1 It is a schematic diagram of an application scenario of a light leakage prevention curved backlight module according to an embodiment of the present invention;

[0028] Figure 2 is Figure 1 an enlarged view of part A in;

[0029] Figure 3 It is a schematic structural diagram of a frame in a light leakage prevention curved backlight module according to an embodiment of the present invention.

[0030] Description of the Reference Numerals in the Drawings:

[0031] 1. Frame; 11. Placement platform; 12. Fixed cavity; 13. Limiting portion; 2. Optical component; 3. LED light board; 4. LED. Specific Embodiments

[0032] In order to make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0033] With the continuous progress of technology, profound changes have taken place in the field of display technology. From the initial cathode ray tube (CRT) displays to the currently widely used liquid crystal displays (LCDs) and the emerging organic light emitting diode (OLED) displays, each technological innovation has brought users a clearer and more comfortable visual experience. Among them, as a key component of liquid crystal displays, the performance of the backlight module directly determines the display effect of the display screen.

[0034] In a liquid crystal display, the liquid crystal itself does not emit light, and the backlight module is needed to provide a uniform light source to display images. Therefore, the quality of the backlight module directly affects the key indicators of the display screen, such as brightness, contrast, and color reproduction. In recent years, as consumers' requirements for display devices continue to increase, large-size, high-resolution, curved and special-shaped display screens have gradually become the mainstream of the market. This also puts higher requirements on the design and manufacture of backlight modules.

[0035] Large-size backlight modules, especially curved and special-shaped backlight modules, not only meet consumers' pursuit of visual experience, but also bring huge challenges to the production and assembly process. For curved display screens, the three main components, namely the structural parts, light guide plate, and LED light strips, can easily fail to maintain good optical elements due to process or tolerance problems, resulting in light leakage. Specifically, for LED light strips, because they are prone to displacement during the bending process, they cannot maintain the same relative position with the light guide plate, resulting in light leakage.

[0036] That is, when the LED light source deviates from the upper / lower surface of the light guide plate, a series of serious problems will occur. The most intuitive manifestation is the uneven brightness of the backlight module. Some areas may leak light, causing the picture to be too bright, affecting the visual effect; while other areas may appear dark areas, making it difficult to clearly present the details of the picture. This uneven brightness phenomenon will not only reduce the overall quality of the display, but also have a great impact on the user's viewing experience.

[0037] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0038] According to an embodiment of the present invention, a light leakage-proof curved backlight module is provided. The curved backlight module is used for Figure 1 The curved screen shown in the figure has a curved backlight module including a frame 1, an optical component 2 and a light source component. The frame 1 is provided with a placement platform 11 and a fixed cavity 12, and the fixed cavity 12 is adjacent to the placement platform 11; the optical component 2 is placed on the placement platform 11 of the frame 1, the light source component is fixed inside the fixed cavity 12 of the frame 1, the light emitting side of the light source component is arranged toward the placement platform 11, and the light emitting side of the light source component is located on the light incident side of the optical component 2, so that the light emitting window of the light source component can always be aligned with the cross-sectional size of the light incident side of the optical component 2.

[0039] In this embodiment, by providing a frame 1, a placement platform 11 and a fixing cavity 12 are provided on the frame 1. During installation, the optical component 2 is placed on the placement platform 11 of the frame 1, and the light source component is fixed inside the fixing cavity 12 of the frame 1, and the light-emitting side of the light source component is arranged towards the placement platform 11. By providing the fixing cavity 12 adjacent to the placement platform 11, it is convenient to make the light-emitting side of the light source component located on the light-incident side of the optical component 2 during installation. The light source component is fixed by the fixing cavity 12, and the placement platform 11 is provided to support the optical component 2, so that the relative position between the light source component and the optical component 2 can be accurately controlled, so that the light-emitting window of the light source component can always be aligned within the cross-sectional dimension of the light-incident side of the optical component 2, effectively reducing problems such as uneven brightness and light leakage caused by light source deviation, and improving the display effect of the curved backlight module.

[0040] Among them, the frame 1 serves as the support structure of the entire curved backlight module and can be produced by an aluminum extrusion process. Compared with the stamping process used in mass-produced products on the current market, it has the advantages of ultra-low cost, short development cycle, and resource saving. The optical component 2 can be composed of multiple layers. The bottom layer is a light guide plate made of acrylic material, which has good optical properties and can convert the point light source or line light source emitted by the light source component into a surface light source. The surface of the light guide plate is distributed with a microstructure array, which can effectively guide the light propagation direction and improve the light utilization rate. Above the light guide plate, optical films such as a diffusion film and a brightness enhancement film are sequentially covered. The diffusion film can further uniform the light distribution and reduce the phenomenon of uneven brightness; the brightness enhancement film can improve the light output efficiency and make the light output by the curved backlight module brighter. The light source component is fixed inside the fixing cavity 12 of the frame 1, and the light source component adopts a side-direction pluggable installation design, which is convenient for operation during maintenance or replacement. The light source component is composed of an LED lamp board 3 and multiple LEDs 4. The LEDs 4 on the LED lamp board 3 are distributed according to a specific pitch and arrangement to ensure the uniformity of light output.

[0041] As Figure 1 and Figure 2 In the structure shown, there is a gap between the side wall of the fixing cavity 12 and the side of the optical component 2 close to the placement platform 11. In another embodiment, a limiting portion 13 is provided on the side of the fixing cavity 12 close to the placement platform 11, and the limiting portion 13 is adapted to limit the side of the light source component close to the optical component 2.

[0042] By providing a limiting portion 13 on the side of the fixing cavity 12 close to the placement platform 11, when the light source component is inserted into the fixing cavity 12, the limiting portion 13 is adapted to limit the side of the light source component close to the optical component 2, and then realize abutting fixation around the light source component to ensure the stability of the light source component inside the fixing cavity 12. Specifically, different fromFigure 1 and Figure 2 For the structure shown in Figure 2 , in this embodiment, the limiting portion 13 is a stepped surface formed by the height difference between the bottom of the fixed cavity 12 and the upper side of the placement platform 11. By constructing a specific height difference between the bottom of the fixed cavity 12 and the upper side of the placement platform 11, the stepped surface is naturally formed. This stepped surface limiting structure is easy to process and has high stability. When the light source component is installed in the fixed cavity 12, the side close to the optical component 2 will be in close contact with the stepped surface, thereby effectively restricting the displacement of the light source component in the direction close to the optical component 2.

[0043] In one embodiment, a positioning structure is provided between the light source component and the frame 1 structure, and the light source component is ensured to be stable in the fixed cavity 12 through the positioning structure.

[0044] In order to comprehensively ensure the stability of the light source component in the fixed cavity 12 and maintain its precise relative position with the optical component 2, this curved surface backlight module is provided with a positioning structure between the light source component and the frame 1 structure. This design improves the stability and reliability of the curved surface backlight module during production and use, and ensures high-quality output of the display effect.

[0045] As a specific implementation manner, the positioning structure includes positioning protrusions provided on the light source part and positioning grooves provided on the inner wall of the fixed cavity 12 that are adapted to the positioning protrusions; or

[0046] The positioning structure includes positioning grooves provided on the light source part and positioning protrusions provided on the inner wall of the fixed cavity 12 that are adapted to the positioning protrusions.

[0047] In this positioning structure, at the edge of the light source component (specifically the edge of the LED lamp board 3), according to the shape and size of the light source component, positioning protrusions are designed and processed. The shapes of the positioning protrusions are diverse, and common ones include cylindrical, cuboid, dovetail-shaped, etc. The cylindrical positioning protrusions are easy to process and can provide good circumferential constraints during positioning; the cuboid positioning protrusions have strong limiting capabilities in multiple directions; the unique shape of the dovetail-shaped positioning protrusions makes them excellent in preventing component displacement and torsion. Correspondingly, on the inner wall of the fixed cavity 12, positioning grooves that are exactly adapted to the shape and size of the positioning protrusions are precisely processed. The depth and width of the positioning grooves are calculated to ensure that the positioning protrusions can be tightly embedded to achieve high-precision positioning.

[0048] Another positioning structure is to set a positioning groove on the light source component and set a positioning protrusion at a corresponding position on the inner wall of the fixed cavity 12. The shape of the positioning groove can also be cylindrical, rectangular or dovetail. Compared with the protrusion-groove positioning structure, the groove-protrusion positioning structure has unique advantages in some cases. For example, when the installation space of the light source component is limited and the positioning protrusion cannot be protrudingly set on its surface, the groove-protrusion positioning structure can solve this problem well.

[0049] In one embodiment, a fine-tuning device is provided on the frame 1 , and the fine-tuning device is configured to adjust the position of the light source component in the fixed cavity 12 .

[0050] In the actual production and application of the curved backlight module, although the basic position of the light source component in the fixed cavity 12 can be ensured by the positioning structure and the limiter 13, due to the inevitable tolerance problem in the production process and the influence of factors such as changes in the use environment, the relative position of the light source component and the optical component 2 may still need to be further accurately calibrated. For this reason, a fine-tuning device is provided on the frame 1, which can finely adjust the position of the light source component in the fixed cavity 12, greatly improving the display performance and stability of the curved backlight module.

[0051] As a specific implementation, the fine-tuning device is a fine-tuning screw arranged on the frame 1, and a fine-tuning blind hole is correspondingly arranged on the light source component. The end of the fine-tuning screw abuts in the fine-tuning blind hole and adjusts the position of the light source component by rotation. In order to achieve precise control of the position of the light source component in the curved backlight module and overcome the position deviation caused by manufacturing tolerance or use, the curved backlight module is designed with a fine-tuning system between the frame 1 and the light source component. The system consists of a fine-tuning screw arranged on the frame 1 and a corresponding fine-tuning blind hole on the light source component. Through a simple and efficient rotation operation, the position of the light source component can be finely adjusted. Specifically, the fine-tuning screw, as the core component for achieving position adjustment, has been optimized in many aspects in design. The screw adopts a fine pitch thread. Compared with a coarse pitch thread, a fine pitch thread has a smaller pitch, which means that the moving distance of the light source component is shorter for each rotation of the screw, thereby achieving more accurate fine-tuning. When the operator is fine-tuning, he first uses a tool to rotate the fine-tuning screw, and monitors the position change of the light source component in real time by observation or with the help of professional optical detection equipment. When the expected position is reached, stop rotating the screw. During the fine-tuning process, a step-by-step fine-tuning method is adopted, and the angle of each rotation should not be too large, and is usually controlled between 10°-30°, so as to accurately control the moving distance of the light source component.

[0052] Among them, the fine-tuning device composed of the fine-tuning screw and the fine-tuning blind hole does not exist in isolation, but cooperates with other components of the curved surface backlight module. When cooperating with the positioning structure, the positioning structure provides an initial positioning reference for the fine-tuning device, enabling the fine-tuning device to make precise adjustments within the range determined by the positioning structure.

[0053] In one embodiment, a heat dissipation structure is provided on the fixed cavity 12 to dissipate heat from the light source component. Specifically, the heat dissipation structure is heat dissipation fins provided on the inner wall of the fixed cavity 12, and the heat dissipation fins are in contact with the light source component.

[0054] During the continuous operation of the curved surface backlight module, the light source component will generate a large amount of heat due to long-term operation. If these heats cannot be dissipated in time, it will cause the temperature of the light source component to be too high, which will not only reduce its luminous efficiency, cause brightness attenuation, affect the display effect of the curved surface backlight module, but also may shorten the service life of the light source component, and further reduce the reliability of the entire curved surface backlight module. To effectively solve this problem, a heat dissipation structure is provided on the fixed cavity 12 in this embodiment, and the method of installing heat dissipation fins on the inner wall of the fixed cavity 12 is mainly adopted to achieve efficient heat dissipation of the light source component.

[0055] The shape, size and arrangement of the heat dissipation fins play a key role in the heat dissipation effect. In terms of shape design, the heat dissipation fins mainly adopt a sheet structure. To increase the heat dissipation area, some fin surfaces are designed with corrugated or serrated patterns. These unique patterns not only increase the contact area with the air, but also disrupt the air flow, forming turbulence and improving the heat exchange efficiency between the air and the fins. The fin thickness is controlled within 0.5 - 2 mm to ensure that while ensuring the structural strength, the material cost is reduced. The fin spacing is adjusted according to the air flow characteristics and heat dissipation requirements inside the fixed cavity 12, usually between 2 - 5 mm, which can not only avoid the air flow being blocked due to too small a spacing, but also prevent the heat dissipation area from being reduced due to too large a spacing. The material of the heat dissipation fins directly affects the heat dissipation performance. In this embodiment, aluminum alloy is selected as the main material of the heat dissipation fins. Aluminum alloy has the characteristics of low density, light weight and good thermal conductivity, and its thermal conductivity can reach 200 - 300 W / (m·K), which can quickly conduct the heat generated by the light source component to the fin surface and then dissipate it through air convection. In addition, aluminum alloy also has good corrosion resistance and processing performance, which is convenient for making heat dissipation fins of various shapes and sizes, reducing the production cost. In some curved surface backlight modules with extremely high heat dissipation requirements, copper alloy materials can also be used to make heat dissipation fins. The thermal conductivity of copper alloy is higher, reaching 300 - 400 W / (m·K), and the heat dissipation effect is more significant. To ensure efficient heat conduction between the heat dissipation fins and the light source component, a close-fitting contact method is adopted between the two.

[0056] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A light leakage-proof curved backlight module, characterized in that: include: A frame (1) having a placement platform (11) and a fixed cavity (12) disposed thereon, wherein the fixed cavity (12) is adjacent to the placement platform (11); An optical component (2) is placed on a placement platform (11) of the frame (1); A light source component is fixed inside a fixed cavity (12) of the frame (1), the light emitting side of the light source component is arranged toward the placement platform (11), and the light source component is configured to be fixed by the frame (1) so that the light emitting window of the light source component can always be aligned with the cross-sectional dimensions of the light incident side of the optical component (2).

2. The anti-light leakage curved backlight module according to claim 1, characterized in that: A limiting portion (13) is provided on a side of the fixed cavity (12) close to the placement platform (11), and the limiting portion (13) is suitable for limiting a side of the light source component close to the optical component (2).

3. The anti-light leakage curved backlight module according to claim 2, characterized in that: The limiting portion (13) is a stepped surface formed by the height difference between the bottom of the fixed cavity (12) and the upper side of the placement platform (11).

4. The anti-light leakage curved backlight module according to any one of claims 1 to 3, characterized in that: A positioning structure is provided between the light source component and the frame (1) structure, and the light source component is ensured to be stable in the fixed cavity (12) through the positioning structure.

5. The anti-light leakage curved backlight module according to claim 4, characterized in that: The positioning structure comprises a positioning protrusion arranged on the light source portion and a positioning groove arranged on the inner wall of the fixing cavity (12) and adapted to the positioning protrusion; or The positioning structure comprises a positioning groove arranged on the light source part and a positioning protrusion arranged on the inner wall of the fixing cavity (12) and matched with the positioning protrusion.

6. The anti-light leakage curved backlight module according to any one of claims 1 to 5, characterized in that: The frame (1) is provided with a fine-tuning device, and the fine-tuning device is configured to adjust the position of the light source component in the fixed cavity (12).

7. The anti-light leakage curved backlight module according to claim 6, characterized in that: The fine-tuning device is a fine-tuning screw arranged on the frame (1), and a fine-tuning blind hole is correspondingly arranged on the light source component. The end of the fine-tuning screw abuts against the fine-tuning blind hole and adjusts the position of the light source component by rotating.

8. The anti-light leakage curved backlight module according to any one of claims 1 to 7, characterized in that: The fixed cavity (12) is provided with a heat dissipation structure to dissipate heat from the light source component.

9. The anti-light leakage curved backlight module according to claim 8, characterized in that: The heat dissipation structure is a heat dissipation fin arranged on the inner wall of the fixed cavity (12), and the heat dissipation fin is in contact with the light source component.

10. The anti-light leakage curved backlight module according to any one of claims 1 to 9, characterized in that: The light source component comprises an LED light board (3) and an LED (4) fixed on the LED light board (3), wherein the LED (4) is placed on the light incident side of the optical component (2); and the LED light board (3) is fixed inside the fixed cavity (12).

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