Backlight modules, display components and LCD TVs

Abstract

This application relates to a backlight module, a display assembly, and a liquid crystal television. It includes: a light source; a mixing cavity configured to fully mix the light emitted from the light source; an optical film assembly located on the light-emitting side of the mixing cavity; and at least one prism film and one diffusion film; wherein the prism film has an edge diffuser that covers only the edge region of the prism film to suppress bright edge phenomena. The technical solution of this application can suppress bright edge phenomena without affecting the overall brightness.

Description

Technical Field

[0001] This application relates to the field of LCD TV manufacturing, and in particular to a backlight module, a display assembly, and an LCD TV. Background Technology

[0002] With the increasing popularity of LCD TVs and the continuous improvement of video picture quality, people have higher and higher requirements for the detail of displayed images, and the demands on the hardware performance of display devices are also constantly increasing. Ordinary LCD TVs use backlight-less LCD screens that require a backlight module, and the backlight must be a sufficiently uniform surface light source to maximize the screen's display capabilities.

[0003] In the actual design process, because the back panel has a cavity structure, the four sides will reflect and converge excess light, which is extremely easy to cause bright edge phenomenon and affect the final image presentation effect. Utility Model Content

[0004] In view of this, this application provides a backlight module, a display assembly, and an LCD television to solve at least one problem existing in the prior art.

[0005] To achieve the above objectives, the technical solution of this application is implemented as follows:

[0006] In a first aspect, embodiments of this application provide a backlight module for use in an LCD television, the backlight module comprising:

[0007] light source;

[0008] A light mixing cavity is configured to fully mix the light emitted by the light source;

[0009] An optical film assembly is located on the light-emitting side of the mixing cavity; it includes at least one prism film and one diffusion film; wherein the prism film is provided with an edge diffuser, which only covers the edge area of ​​the prism film to suppress bright edge phenomenon.

[0010] In one alternative embodiment, the area of ​​the edge diffuser sheet accounts for 5%–25% of the total area of ​​the prism film.

[0011] In an optional embodiment, the optical diaphragm assembly further includes:

[0012] The lower diffusion film is located below the prism film;

[0013] The upper diffusion film is located above the prism film.

[0014] In one alternative embodiment, the haze of the edge diffuser is greater than that of the upper diffuser film.

[0015] In one alternative embodiment, the haze of the edge diffuser is 75%–95%.

[0016] In one alternative embodiment, the outer contour of the edge diffuser is smaller than the outer contour of the prism film, so that a portion of the periphery of the prism film is exposed, thereby making the brightness at the edge of the screen more uniform.

[0017] In one alternative embodiment, the concentration of diffusing particles in the edge diffuser is higher than that in the upper diffuser film to enhance the scattering ability of edge light.

[0018] In an alternative embodiment, the edge diffuser sheet is adhered to the prism film using PET composite adhesive.

[0019] Secondly, embodiments of this application provide a display screen assembly, including:

[0020] Any of the backlight modules mentioned above;

[0021] A liquid crystal panel is disposed on the light-emitting side of the optical film assembly;

[0022] The frame covers and secures the edges of the backlight module and the liquid crystal panel.

[0023] Thirdly, embodiments of this application provide a liquid crystal television, including the display screen assembly described above.

[0024] The backlight module, display assembly, and LCD TV provided in this application include: a light source; a mixing cavity configured to fully mix the light emitted by the light source; an optical film group located on the light-emitting side of the mixing cavity; comprising at least one prism film and one diffusion film; wherein one of the prism films is provided with an edge diffuser, the edge diffuser only covering the edge area of ​​the prism film to suppress bright edge phenomenon. Therefore, in the backlight module, display assembly, and LCD TV of this application embodiment, the edge diffuser is provided in one of the prism films in the optical film group, and the edge diffuser only covers the edge area of ​​the prism film, which can suppress bright edge phenomenon without affecting the overall brightness.

[0025] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0026] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0027] Figure 1 A schematic diagram of the backlight module provided in the embodiments of this application;

[0028] Figure 2 This is a schematic diagram of the optical film group in the backlight module provided in the embodiments of this application.

[0029] Explanation of reference numerals in the attached figures:

[0030] 10. Backplate; 20. Light source; 30. Mixing cavity; 41. Reflector; 42. Diffuser; 50. Optical film assembly; 51. Lower diffuser film; 52. Prism film; 53. Upper diffuser film; 60. Edge diffuser; 70. Liquid crystal panel. Detailed Implementation

[0031] To make the technical solutions and beneficial effects of this application more obvious and understandable, the technical solutions in the embodiments of this application are clearly and completely described below by listing specific embodiments. Obviously, the embodiments of this application are not exhaustive, and the described embodiments are only some embodiments of this application, not all embodiments.

[0032] The exemplary embodiments disclosed in this application will now be described in more detail with reference to the accompanying drawings, providing detailed structures and steps to illustrate the technical solution of this application. Note that the drawings are not necessarily drawn to scale, and local features may be enlarged or reduced to more clearly show the details of the local features.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains. The terminology used herein is for the purpose of describing particular embodiments only and should not be construed as limiting the technical solutions of this application.

[0034] The following description provides numerous specific details to offer a more thorough understanding of this application. However, it will be apparent to those skilled in the art that this application can be practiced without one or more of these details. To clearly define the inventive concept of this application and avoid confusion with its content, technical features well-known in the art and conventionally understood by those skilled in the art are not elaborated upon. Specifically, this document does not fully list all features of actual embodiments, nor does it provide a detailed description of well-known functions and structures.

[0035] The applicant of this application discovered during the research and development process that designers need to eliminate the bright edges caused by reflections as much as possible during the design process. However, due to the requirement for high backlight brightness, designers do not want to sacrifice the overall brightness excessively. Therefore, a method that can precisely reduce the brightness of the backlight edges without affecting the brightness of the main surface is necessary.

[0036] Therefore, based on further research and development by the applicant, the following technical solution was proposed.

[0037] To address the technical problems in related technologies, embodiments of this application provide a backlight module applied to an LCD television. (Reference) Figure 1 The backlight module includes:

[0038] Light source 20;

[0039] The light mixing cavity 30 is configured to fully mix the light emitted by the light source 20;

[0040] An optical film assembly 50 is located on the light-emitting side of the mixing cavity; it includes at least one prism film 52 and one diffusion film; wherein the prism film 52 is provided with an edge diffuser 60, which only covers the edge area of ​​the prism film 52 to suppress the bright edge phenomenon.

[0041] It should be noted that the embodiments of this application are described using a direct-lit backlight module as an example. It can be understood that the technical solutions of the embodiments of this application can also be used for other types of backlight modules.

[0042] Understandably, the light source 20 can be an LED light strip, which will not be described in detail.

[0043] The light mixing cavity 30 is the space between the light source 20 and the diffuser plate 42, which can fully mix the light and reduce local overbrightness.

[0044] Understandably, the optical film assembly 50 is located above the light mixing cavity 30, with multiple layers of films stacked sequentially to optimize light distribution. Among them, the prism film 52, also known as a brightness enhancement film, is configured to concentrate light through a prism structure, increasing frontal brightness. The diffuser film is configured to diffuse light, making the emitted light softer or maintaining high light transmittance, eliminating graininess.

[0045] The edge diffuser 60 is used to make the light emitted from the edge of the prism film 52 softer and suppress the bright edge phenomenon. However, since it is only set at the edge, it does not affect the brightness of other areas.

[0046] Specifically, the backlight module in this application embodiment also includes a reflective sheet 41, which is configured to efficiently reflect light to optimize light energy utilization.

[0047] Understandably, the light emitted by the light source 20 will scatter in all directions, and some of the light may directly hit the bottom or side wall of the module, resulting in wasted light energy. The reflective sheet 41 reflects this "escaped" light back to the display area by using a high reflectivity material (such as silver plating, PET substrate + reflective coating), allowing more light to participate in imaging, thereby improving the overall brightness.

[0048] Specifically, the backlight module in this embodiment of the application also includes a diffuser plate 42, which is configured to initially convert a point light source into a surface light source through refraction.

[0049] Specifically, the backlight module in this embodiment of the application also includes a back plate 10, configured to support and protect the backlight module.

[0050] In the backlight module of this application embodiment, an edge diffuser 60 is provided on one of the prism films 52 in the optical film group. The edge diffuser 60 only covers the edge area of ​​the prism film 52, which can suppress the bright edge phenomenon and does not affect the overall brightness.

[0051] This means that only local light scattering is applied to the edge areas that are prone to bright edges, precisely suppressing the brightness peak, while the central area maintains high transmittance and high luminance, achieving "local intervention and global brightness preservation".

[0052] In some embodiments of this application, the area of ​​the edge diffuser 60 accounts for 5%–25% of the total area of ​​the prism film 52.

[0053] This approach effectively suppresses bright edges while minimizing the impact on overall brightness. A small area (<5%) results in insufficient suppression, while a large area (>25%) may affect the brightness of the effective display area or increase costs. 5%–25% represents the optimal range for balancing effectiveness and cost.

[0054] In some embodiments of this application, the optical diaphragm assembly 50 further includes:

[0055] The lower diffusion film 51 is located below the prism film 52;

[0056] The upper diffusion film 53 is located above the prism film 52.

[0057] It is understandable that the lower diffuser 51 is configured to transform a point light source or line light source into a uniform surface light source, making the emitted light softer and eliminating the graininess of the LED light. That is, based on the diffuser plate 42, it further transforms the point light source into a uniform surface light source.

[0058] The upper diffuser 53 is configured to diffuse light while maintaining high light transmittance, softening the light, improving the viewing angle, and preventing the brightening film prism structure from causing image graininess.

[0059] In some embodiments of this application, the haze of the edge diffuser 60 is greater than that of the upper diffuser film 53.

[0060] In this way, the edge diffuser 60 has a stronger scattering ability to suppress bright edges.

[0061] In some embodiments of this application, the haze of the edge diffuser 60 is 75%–95%.

[0062] This level of haze effectively suppresses bright edges without making the edges too dark, and it is also cost-effective.

[0063] Specifically, too low a haze (<75%) results in insufficient scattering; too high a haze (>95%) leads to overly dark edges, creating a new problem of "dark edges." 75%–95% can effectively suppress bright edges without causing them to turn black.

[0064] In some embodiments of this application, the outer contour of the edge diffuser 60 is smaller than the outer contour of the prism film 52, so that a portion of the periphery of the prism film 52 is exposed, thereby making the brightness of the screen edge more uniform.

[0065] Understandably, different backlight solutions have different degrees of light concentration at the edges. Therefore, allowing some areas of the outer periphery of the prism film 52 to be exposed can make the brightness at the screen edge more uniform, thus achieving the effect of uniform light.

[0066] Specifically, the prism film 52 may have a circumferential outer edge exposed.

[0067] In some embodiments of this application, the diffusion particle concentration of the edge diffuser 60 is higher than that of the upper diffuser film 53 to enhance the scattering ability of edge light.

[0068] Understandably, high concentrations of diffused particles can disperse and diffuse the originally concentrated edge light rays, reducing local peak brightness and making the effect of suppressing bright edges better.

[0069] In some embodiments of this application, the edge diffuser 60 is adhered to the prism film 52 using PET composite adhesive.

[0070] PET stands for polyethylene terephthalate. PET composite adhesive is a medium- and high-temperature composite adhesive formulated from thermoplastic polyester resin. Both the diffuser sheet and prism film 52 can be made of PET; therefore, the PET composite adhesive is similar in material to the diffuser sheet or prism film 52 and does not affect the performance of the prism film 52 and the diffuser sheet.

[0071] Furthermore, PET composite adhesive has strong adhesion, optical transparency, resistance to yellowing, and does not delaminate due to stress caused by thermal cycling, ensuring long-term reliability.

[0072] This application embodiment also provides a display screen assembly, including:

[0073] The backlight module described above;

[0074] A liquid crystal panel 70 is disposed on the light-emitting side of the optical film group 50;

[0075] The frame covers and secures the edges of the backlight module and the liquid crystal panel.

[0076] In the display assembly of this application embodiment, an edge diffuser 60 is provided on one of the prism films 52 in the optical film group. The edge diffuser 60 only covers the edge area of ​​the prism film 52, which can suppress the bright edge phenomenon and does not affect the overall brightness.

[0077] This application also provides a liquid crystal television, including the display screen assembly described above.

[0078] Specifically, LCD TVs also include stands / stands, remote controls, power cords, casings, sound systems, etc., which will not be detailed here.

[0079] In the liquid crystal television of this application embodiment, an edge diffuser 60 is provided on one of the prism films 52 in the optical film group. The edge diffuser 60 only covers the edge area of ​​the prism film 52, which can suppress the bright edge phenomenon and does not affect the overall brightness.

[0080] It should be noted that the various embodiments or implementation methods in this document can be described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to mutually. It should be understood that in the various embodiments of this application, the embodiment numbers are merely for descriptive purposes and do not represent the superiority or inferiority of the embodiments.

[0081] Understandably, without conflict, the technical features in the technical solutions described in each embodiment can be arbitrarily combined to form new embodiments. For example, each structure in each embodiment can be implemented as an independent embodiment, and the structures can be arbitrarily combined; some or all of the structures in different embodiments can be arbitrarily combined. Each step in each embodiment can be implemented as an independent embodiment, and the steps can be arbitrarily combined; the order of the steps can be arbitrarily interchanged; some or all of the steps in different embodiments can be arbitrarily combined. Furthermore, regarding the table in the embodiments, each element, each row, or each column in the table can be implemented as an independent embodiment.

[0082] In this document, when the terms "embodiment," "implementation," or "example" are used, it means that the specific features described in connection with these implementations or examples are included in at least one implementation, embodiment, or example of this application. It should be noted that the illustrative expressions of the above terms do not necessarily refer to the same implementation, embodiment, or example. Furthermore, the specific features described, such as structures or steps, can be appropriately combined in any one or more implementations, embodiments, or examples.

[0083] In some embodiments, prefixes such as "first" and "second" are used merely to distinguish different descriptive objects and do not impose restrictions on the position, order, priority, or value of the descriptive objects. The description of the descriptive objects is based on the context of the claims or embodiments, and the use of prefixes does not constitute unnecessary limitations. For example, the numerical value of the descriptive object is not limited by ordinal numbers and can be one or more. For instance, in "first device," the numerical value of "device" can be one or more. Furthermore, objects modified by different prefixes can be the same or different. For example, if the descriptive object is "device," then "first device" and "second device" can be the same device or different devices, and their types can be the same or different. Describing "first" does not necessarily imply the existence of "second," and discussing "second" does not necessarily imply the existence of "first."

[0084] In some embodiments, unless otherwise stated, elements expressed in the singular form, such as “a,” “the,” “the,” “the,” “the,” “the,” etc., can mean “one and only one,” or “one or more,” “at least one,” etc. For example, when using articles such as “a,” “an,” “the,” etc. in translation, the noun following the article can be understood as either a singular or a plural expression. In some embodiments, “multiple” refers to two or more.

[0085] In some embodiments, the terms “at least one of”, “one or more”, “a plurality of”, “multiple”, etc., may be used interchangeably.

[0086] In some embodiments, the notation "at least one of A and B", "A and / or B", "A in one case, B in another", "A in one case, B in another", etc., may include the following technical solutions depending on the situation: in some embodiments, A (A is executed regardless of B); in some embodiments, B (B is executed regardless of A); in some embodiments, execution is selected from A and B (A and B are selectively executed); in some embodiments, both A and B are executed. The same applies when there are more branches such as A, B, C, etc.

[0087] In some embodiments, the notation "A or B" may include the following technical solutions, depending on the situation: in some embodiments, A (execution of A regardless of B); in some embodiments, B (execution of B regardless of A); in some embodiments, selective execution from A and B (A and B are selectively executed). The same applies when there are more branches such as A, B, and C.

[0088] In some embodiments, unless otherwise expressly defined, the terms "installation," "connection," "linking," "fixing," "setting," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral part; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection or an indirect connection through an intermediate medium; it can also refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0089] In some embodiments, the terms “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “height,” “up,” “down,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used for the purpose of simplifying the description of this application and do not indicate that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. That is, they should not be construed as limitations on this application.

[0090] In some embodiments, unless otherwise expressly defined, "above" or "below" the second feature can mean that the first and second features are in direct contact, or indirect contact via an intermediate medium, or that they are not in contact, but simply indicate that the horizontal level of the first feature is higher than that of the second feature. Furthermore, "above" or "below" the second feature can mean that the first feature is directly above or diagonally above, directly below, or diagonally below the second feature.

[0091] In some embodiments, spatial relation terms such as “upper” and “lower” may be used for convenience of description to describe the relationship of one element or feature shown in the figures to other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms are intended to also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, the description of an element or feature “below” other elements or features will change it to “upper” other elements or features. Therefore, the exemplary terms “upper” and “lower” can include both upper and lower orientations. The device may also be otherwise oriented (rotated 90 degrees or otherwise), and the spatial descriptive terms used herein will be interpreted accordingly.

[0092] It should be understood that the above embodiments are exemplary and are not intended to encompass all possible implementations of the technical solutions of this application. Various modifications and changes can be made to the above embodiments without departing from the scope of this application. Similarly, the various technical features of the above embodiments can be arbitrarily combined to form other embodiments of this application that may not be explicitly described. Therefore, the above embodiments only illustrate several implementations of this application and do not limit the scope of protection of this patent application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

Claims

1. A backlight module for use in an LCD television, characterized in that, The backlight module includes: light source; A light mixing cavity is configured to fully mix the light emitted by the light source; An optical film assembly is located on the light-emitting side of the mixing cavity; it includes at least one prism film and one diffusion film; wherein the prism film is provided with an edge diffuser, which only covers the edge area of ​​the prism film to suppress bright edge phenomenon.

2. The backlight module according to claim 1, characterized in that, The area of ​​the edge diffuser accounts for 5%–25% of the total area of ​​the prism film.

3. The backlight module according to claim 1, characterized in that, The optical film assembly also includes: The lower diffusion film is located below the prism film; The upper diffusion film is located above the prism film.

4. The backlight module according to claim 3, characterized in that, The haze of the edge diffuser is greater than that of the upper diffuser film.

5. The backlight module according to claim 2, characterized in that, The haze of the edge diffuser is 75%–95%.

6. The backlight module according to claim 1, characterized in that, The outer contour of the edge diffuser is smaller than the outer contour of the prism film, so that a portion of the periphery of the prism film is exposed, thereby making the brightness of the screen edge more uniform.

7. The backlight module according to claim 3, characterized in that, The concentration of diffusion particles in the edge diffuser is higher than that in the upper diffuser film, thereby enhancing the scattering ability of edge light.

8. The backlight module according to claim 1, characterized in that, The edge diffuser sheet is attached to the prism film using PET composite adhesive.

9. A display screen assembly, characterized in that, include: The backlight module according to any one of claims 1-8; A liquid crystal panel is disposed on the light-emitting side of the optical film assembly; The frame covers and secures the edges of the backlight module and the liquid crystal panel.

10. A liquid crystal television set, characterized in that, Includes the display assembly as described in claim 9.

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