Middle-frame-free duplex screen backlight module and vehicle-mounted display device
By combining the COB lamp panel and the beam splitter, the mid-frame design is eliminated, solving the problem of the heavy weight of automotive backlights and achieving ultra-thin and ultra-lightweight effects.
Patent Information
- Application Number
- CN202520375848.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-05
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-03-05
AI Technical Summary
Existing automotive backlights are thick and heavy, making it difficult to achieve ultra-thin and lightweight designs.
It adopts a combination structure of COB lamp board and beam splitter, eliminating the middle frame design. By directly bonding the COB lamp board and beam splitter and stacking multiple beam splitters, the gap between the LED chip and beam splitter is reduced, and tape is used for connection, achieving ultra-thinness and ultra-lightness.
The thickness and weight of the backlight module have been significantly reduced, achieving an ultra-thin and ultra-lightweight effect for medium and large-sized dual screens.
Smart Images
Figure CN223742917U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of display screen technology, and in particular to a frameless dual-screen backlight module and an in-vehicle display device. Background Technology
[0002] In recent years, with the continuous improvement of image quality for automotive backlights, automotive displays have experienced rapid development in the automotive electronics field. They provide real-time monitoring of the external environment for drivers and passengers, and automakers are increasingly demanding large-size, dual-screen, ultra-thin, and ultra-lightweight automotive displays. For example... Figure 1 As shown, a traditional automotive backlight includes a die-cast part 31, a lamp panel 32, a diffuser plate 33, a brightness enhancement film, a light control film, and a middle frame 34. The lamp panel 32 is disposed within the die-cast part 31, the diffuser plate 33 is disposed on the support platform of the die-cast part 31, the brightness enhancement film is disposed on the diffuser plate 33, the light control film is disposed on the brightness enhancement film, and the middle frame 34 is connected to the lower frame. In the prior art, the lamp panel 32 includes a circuit board and multiple LEDs, each LED being soldered onto the circuit board. The circuit board is 0.8mm thick, the LEDs are 0.5mm thick, and the total thickness of the lamp panel 32 is 1.3mm. The diffuser plate 33 is 2.0mm thick. Since the gap between the diffuser plate 33 and the LEDs is more than 5mm, the assembled automotive backlight is 18.9mm thick, which not only increases the thickness of the automotive backlight but also increases the weight of the product. Utility Model Content
[0003] In view of this, the purpose of this utility model is to provide a frameless dual-screen backlight module, which can solve the technical problems existing in the prior art, reduce the overall thickness of the backlight module, and achieve ultra-thinness and lightweight.
[0004] This utility model provides a frameless dual-screen backlight module, including a lower frame, a COB lamp board, multiple beam splitters, a light enhancement film, and a brightness enhancement film. The COB lamp board is disposed within the lower frame, and each beam splitter is stacked on the COB lamp board. The light enhancement film is disposed on the beam splitter and the brightness enhancement film is disposed on the light enhancement film.
[0005] In one embodiment, the spectrophotometer has 4 to 8 sheets.
[0006] In one embodiment, the COB lamp panel and the beam splitter are connected by a first tape, and two adjacent beam splitters are connected by a second tape.
[0007] In one embodiment, the COB lamp panel is provided with at least one limiting block, and each of the beam splitters is provided with a limiting groove. The limiting block and the limiting groove cooperate to limit the beam splitter.
[0008] In one embodiment, the beam splitters are a first beam splitter, a second beam splitter, a third beam splitter, and a fourth beam splitter. The first beam splitter is fixedly connected to the COB lamp board, the second beam splitter is fixedly connected to the first beam splitter, the third beam splitter is fixedly connected to the second beam splitter, and the fourth beam splitter is fixedly connected to the third beam splitter.
[0009] In one embodiment, the thickness of the spectrophotometer is 0.1 mm to 0.2 mm.
[0010] In one embodiment, the thickness of the COB lamp panel is 0.5mm to 0.8mm.
[0011] In one embodiment, the COB lamp board includes a flexible circuit board and a plurality of LED chips, each of the LED chips being encapsulated within the flexible circuit board, and the gap between the LED chip and the beam splitter is zero.
[0012] In one embodiment, the frameless dual-screen backlight module further includes foam adhesive, which is attached to the side frame of the lower frame and is used to cushion and fix the display screen.
[0013] This utility model also relates to an in-vehicle display device, including the above-mentioned frameless dual-screen backlight module.
[0014] The backlight module of this invention uses a combination of COB lamp board and beam splitter. The characteristics of COB lamp board make its thickness lower than that of traditional lamp boards. The beam splitter is directly bonded to the COB lamp board, making the gap between the beam splitter and the LED chip zero. In addition, the beam splitter itself is relatively thin. Therefore, the combination of COB lamp board and beam splitter can significantly reduce the thickness of the assembled backlight module. Furthermore, the elimination of the mid-frame design in this backlight module makes the assembled backlight module ultra-thin and ultra-light, solving the problem of the heavy weight of products assembled from medium and large-sized dual-screen backlight modules. Attached Figure Description
[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0016] Figure 1 This is a partial cross-sectional structural diagram of an existing automotive backlight.
[0017] Figure 2 This is a partial cross-sectional view of the backlight module of this utility model.
[0018] Figure 3 This is a schematic diagram of the disassembled structure of the backlight module of this utility model.
[0019] Figure 4 This is a partial top view of the COB lamp board and beam splitter in another embodiment of the present invention.
[0020] Explanation of reference numerals: Bottom frame - 11; COB lamp panel - 12; Limiting block - 121; Beam splitter - 13; First beam splitter - 131; Second beam splitter - 132; Third beam splitter - 133; Fourth beam splitter - 134; Limiting groove - 101; Brightness enhancement film - 14; Brightness enhancement film - 15; Foam adhesive - 16; Display screen - 21. Detailed Implementation
[0021] The specific embodiments of this utility model will now be described in detail with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. Based on the description of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.
[0022] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "set," "install," and "connect," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances.
[0023] The terms “upper,” “lower,” “left,” “right,” “front,” “back,” “top,” “bottom,” “inner,” and “outer,” etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product is in use. They are used only for the convenience of description and simplification, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.
[0024] The terms “first,” “second,” “third,” etc., are used merely to distinguish elements with similar properties, not to indicate or imply relative importance or a specific order.
[0025] The terms “include,” “comprising,” or any other variation thereof are intended to cover non-exclusive inclusion, which includes not only the elements listed but also other elements not expressly listed.
[0026] like Figures 2 to 4As shown, the frameless dual-screen backlight module includes a lower frame 11, a COB lamp board 12, multiple beam splitters 13, a brightness enhancement film 14, and a brightness enhancement film 15. The COB lamp board 12 is disposed within the lower frame 11. Each beam splitter 13 is stacked on the COB lamp board 12, the brightness enhancement film 14 is disposed on the beam splitter 13, and the brightness enhancement film 15 is disposed on the brightness enhancement film 14. The COB lamp board 12 includes a flexible circuit board and multiple LED chips. Each LED chip is encapsulated within the flexible circuit board, and the gap between the LED chip and the beam splitter 13 is zero. In this embodiment, COB stands for Chip-on-Board, which refers to the technology of directly mounting multiple LED chips on a substrate and then encapsulating them as a whole to form a high-density and high-brightness light source. This eliminates the need for traditional brackets and SMD packaging, reducing costs through integrated encapsulation. The integrated design of multiple LED chips reduces the graininess of the light spot, resulting in more uniform and softer light. The encapsulation material often uses silicone or epoxy resin to cover the LED chips, achieving optical diffusion, protection, and heat dissipation. The COB lamp board 12 is suitable for compact structures and has significant advantages in the display screen 21 field. The beam splitter 13 is an optical film that splits incident light into two or more beams according to a specific ratio or wavelength using the principle of optical interference. The frameless dual-screen backlight module of this embodiment is suitable for display devices larger than 21 inches. Dual-screen refers to the backlight module forming two integrated backlight display areas during assembly, providing uniform and high-brightness backlight to both screens, allowing the two screens to be controlled individually or jointly.
[0027] The backlight module of this utility model adopts the combination of COB lamp board 12 and beam splitter 13. The characteristics of COB lamp board 12 make its thickness lower than that of traditional lamp boards. The beam splitter 13 is directly bonded to COB lamp board 12, so that the gap between beam splitter 13 and LED chip is 0. In addition, the beam splitter 13 itself is relatively thin. Therefore, the combination of COB lamp board 12 and beam splitter 13 can significantly reduce the thickness of the assembled backlight module. Furthermore, the design of the middle frame is eliminated in this backlight module, so that the assembled backlight module can achieve ultra-thinness and ultra-lightness, solving the problem of heavy products assembled from medium and large-sized dual-screen backlight modules.
[0028] Preferably, the beam splitter 13 has 4 to 8 sheets; more preferably 4, 5, 6, 7 or 8 sheets. Taking 4 sheets of beam splitter 13 as an example, the beam splitter 13 consists of a first beam splitter 131, a second beam splitter 132, a third beam splitter 133 and a fourth beam splitter 134. The first beam splitter 131 is fixedly connected to the COB lamp board 12, the second beam splitter 132 is fixedly connected to the first beam splitter 131, the third beam splitter 133 is fixedly connected to the second beam splitter 132, and the fourth beam splitter 134 is fixedly connected to the third beam splitter 133.
[0029] Preferably, the COB lamp panel 12 and the beam splitter 13 are connected by a first tape, and two adjacent beam splitters 13 are connected by a second tape.
[0030] In another preferred embodiment, such as Figure 4 As shown, the COB lamp panel 12 is provided with at least one limiting block 121, and each beam splitter is provided with a limiting groove 101. The limiting block 121 and the limiting groove 101 cooperate to limit the beam splitter. Then, the COB lamp panel 12 and the beam splitter 13 are connected by a first tape, and two adjacent beam splitters 13 are connected by a second tape. The first tape is preferably double-sided tape, and the second tape is preferably double-sided tape.
[0031] Preferably, the thickness of the beam-splitting film 13 is 0.1mm to 0.2mm, and more preferably 0.1mm, 0.15mm, 0.16mm, or 0.2mm; the thickness of the COB lamp panel 12 is 0.5mm to 0.8mm, and more preferably 0.5mm, 0.6mm, 0.69mm, or 0.8mm.
[0032] Preferably, the frameless dual-screen backlight module also includes foam adhesive 16, i.e., VHB tape, which is attached to the side frame of the lower frame 11. The foam adhesive 16 is used to cushion and fix the display screen 21.
[0033] This utility model also relates to an in-vehicle display device, including the aforementioned frameless dual-screen backlight module. The in-vehicle display device in this embodiment may be, for example, an in-vehicle central control display, an in-vehicle dashcam, an in-vehicle DVD navigation system, an integrated display screen for the in-vehicle dashboard, an in-vehicle streaming media rearview mirror, or a car seat headrest display, but is not limited thereto.
[0034] The above are merely specific embodiments of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.
Claims
1. A bezel-free dual-screen backlight module, characterized in that, The backlight module comprises a lower frame (11), a COB lamp plate (12), a plurality of light splitting films (13), a light enhancement film (14) and a brightness enhancement film (15), the COB lamp plate (12) is arranged in the lower frame (11), each light splitting film (13) is arranged on the COB lamp plate (12) in layers, the light enhancement film (14) is arranged on the light splitting film (13), and the brightness enhancement film (15) is arranged on the light enhancement film (14). 2.The frameless double-screen backlight module of claim 1, wherein, The light splitting film (13) is provided with 4-8 light splitting films. 3.The frameless double-screen backlight module of claim 1, wherein, The COB lamp plate (12) and the light splitting film (13) are connected by a first adhesive tape, and two adjacent light splitting films (13) are connected by a second adhesive tape. 4.The frameless double-sided display backlight module of claim 1, wherein, The COB lamp plate (12) is provided with at least one limiting block (121), and each light splitting film is provided with a limiting groove (101), and the limiting block (121) and the limiting groove (101) cooperate to limit the light splitting film.
5. The no-bezel dual-screen backlight module of any one of claims 1 to 4, wherein, The light splitting film (13) is respectively a first light splitting film (131), a second light splitting film (132), a third light splitting film (133) and a fourth light splitting film (134), the first light splitting film (131) is fixedly connected to the COB lamp plate (12), the second light splitting film (132) is fixedly connected to the first light splitting film (131), the third light splitting film (133) is fixedly connected to the second light splitting film (132), and the fourth light splitting film (134) is fixedly connected to the third light splitting film (133). 6.The frameless double-sided display backlight module of claim 1, wherein, The thickness of the light splitting film (13) is 0.1-0.2 mm. 7.The frameless double-sided display backlight module of claim 1, wherein, The thickness of the COB lamp plate (12) is 0.5-0.8 mm. 8.The frameless double-sided display backlight module of claim 1, wherein, The COB lamp plate (12) comprises a flexible circuit board and a plurality of LED chips, each LED chip is encapsulated in the flexible circuit board, and the gap between the LED chip and the light splitting film (13) is zero. 9.The frameless double-sided display backlight module of claim 1, wherein, The double-screen backlight module without a middle frame further comprises a foam adhesive (16), the foam adhesive (16) is connected to the side frame of the lower frame (11), and the foam adhesive (16) is used for buffering and fixing a display screen (21).
10. A display device for a vehicle, characterized by comprising: The backlight module without a middle frame comprises the double-screen backlight module without a middle frame according to any one of claims 1-9. The backlight module without a middle frame comprises the double-screen backlight module without a middle frame according to any one of claims 1-9.