COB vehicle-mounted backlight source module

Abstract

The invention relates to the field of LED backlight source systems, in particular to a COB vehicle-mounted backlight source module which comprises a shell internally provided with an optical film set. The light source cover is mounted in the shell and provided with a mounting groove, a light source groove is formed in the groove wall of the mounting groove, and a light guide plate is arranged on the light emitting side of the light source groove; the light-emitting source is mounted in the mounting groove and comprises a plurality of light-emitting plates with different colors; the adjusting mechanism is used for independently adjusting the light passing quantity of the light-emitting plates with different colors; the main control unit is used for controlling the action of the adjusting mechanism according to the environment illumination condition; and the sensing mechanism is used for sensing the environment illumination condition and transmitting the sensing data to the main control unit. The invention has the effect of improving the spectrum tuning capability.

Description

Technical Field

[0001] This application relates to the field of LED backlight systems, and particularly to a COB vehicle-mounted backlight module. Background Art

[0002] LED backlight technology occupies an important position in the field of vehicle-mounted displays. With high brightness, low cost, and good integration, it is widely used in many key parts such as automotive instrument panels, center control screens, and head-up display systems. With the rapid development of intelligent driving and vehicle networking technologies, vehicle-mounted display devices have put forward higher requirements for color accuracy and environmental adaptability. Under direct strong light, if the spectral tuning is not precise, it will cause the display screen to be overly color-shifted or the contrast to decrease, affecting the driver's rapid recognition of information and increasing driving risks; while during night driving, inappropriate spectral output may cause glare or visual fatigue, reducing driving comfort. Therefore, precise spectral tuning ability can not only improve the display quality, but also be directly related to driving safety and user experience.

[0003] The backlight module usually includes a housing, a light source, a backplane, a reflector, a light guide plate, and an optical film group. To improve the spectral tuning ability, currently, the light source uses a multi-color LED array combination (such as an RGBW structure) in cooperation with pulse width modulation (PWM) technology to achieve spectral adjustment. When the pulse width modulation (PWM) technology controls spectral mixing, due to relying on the adjustment method of time ratio, it is difficult to completely avoid spectral deviations caused by factors such as LED individual differences and driving current fluctuations. Especially in the case where a small wavelength range needs to be precisely controlled, this deviation will be further amplified, thus affecting the final color accuracy. Summary of the Invention

[0004] In order to improve the spectral tuning ability, this application provides a COB vehicle-mounted backlight module.

[0005] A COB vehicle-mounted backlight module provided by this application adopts the following technical solutions: A COB vehicle-mounted backlight module includes: A housing, inside which an optical film group is provided; A light source cover, installed inside the housing. The light source cover is provided with an installation groove, and the groove wall of the installation groove is provided with a light source groove. A light guide plate is provided on the light-emitting side of the light source groove; A light source, installed in the installation groove. The light source includes multiple light-emitting plates of different colors; An adjustment mechanism, used to separately adjust the light transmission amount of different color light-emitting plates; A main control unit, used to control the action of the adjustment mechanism according to the ambient light conditions; A sensing mechanism, used to sense the ambient light conditions and transmit the sensed data to the main control unit.

[0006] By adopting the above technical solution, the adjusting mechanism can achieve independent and precise control of the light passing amount for light-emitting panels of different colors, thereby dynamically adjusting the spectral output according to the ambient light conditions, effectively avoiding problems such as color cast or contrast reduction caused by inaccurate spectral tuning of the display screen. At the same time, the sensing mechanism monitors the ambient light conditions in real time and feeds the data back to the main control unit, enabling the module to have a fast response ability to environmental changes, further improving the display effect and driving safety.

[0007] Optionally, the light-emitting panels are distributed in an arc shape and the light irradiation directions pass through the center of the circle.

[0008] By adopting the above technical solution, the design that the light-emitting panels are distributed in an arc shape and the light irradiation directions pass through the center of the circle optimizes the light convergence effect, reduces light loss, thereby improving the brightness and display quality of the overall backlight module.

[0009] Optionally, the adjusting mechanism includes a driving component, a covering cover, a light-shielding plate, and an adjusting plate. The covering cover is connected to the light source cover, the covering cover covers the light-emitting panel, the covering cover is provided with light-emitting grooves which are equidistantly distributed along the length direction of the light-emitting panel, the light-shielding plate is slidably connected to the covering cover, the adjusting plate is slidably connected to the light source cover, and the driving component is used to drive the adjusting plate to move so that the light-shielding plate blocks or opens the light of the light-emitting panel.

[0010] By adopting the above technical solution, the driving component, the covering cover, the light-shielding plate, and the adjusting plate in the adjusting mechanism cooperate with each other to achieve precise control of the light passing amount of light-emitting panels of different colors. The slidable connection design of the light-shielding plate and the covering cover, combined with the precise movement of the adjusting plate, can flexibly adjust the position of the light-shielding plate, thereby realizing the operation of blocking or opening the light of the light-emitting panel. This not only improves the accuracy of spectral tuning but also enhances the response speed and stability of the system, effectively reducing the spectral deviation problems caused by LED individual differences or driving current fluctuations, and significantly improving the color accuracy and contrast effect of the display screen.

[0011] Optionally, one side of the covering cover is provided with a connecting plate for connecting all the adjusting plates of the same adjusting mechanism. The adjusting plate is hinged to the light-shielding plate, and a rotating rod is rotatably connected to the covering cover. The light-shielding plate is provided with a sliding groove, and the rotating rod is inserted into the sliding groove.

[0012] By adopting the above technical solutions, the setting of the connecting plate enables all the adjusting plates of the same adjusting mechanism to move synchronously, thereby realizing the coordinated control of the light-shielding plate, improving the adjustment accuracy and consistency. The hinged design of the adjusting plate and the light-shielding plate can flexibly adjust the angle of the light-shielding plate during the adjustment process, ensuring that the operation of blocking or opening the light of the light-emitting plate is more accurate. The cooperation between the rotating rod and the sliding groove enables the light-shielding plate to remain stable during the movement, avoiding spectral tuning errors caused by position deviation, and further improving the reliability and accuracy of spectral adjustment.

[0013] Optionally, the covering cover is connected with a guiding plate, the adjusting plate is slidably connected with the guiding plate, the covering cover is connected with a limiting plate, and the plane of one side of the limiting plate away from the covering cover is tangent to the rotating rod.

[0014] By adopting the above technical solutions, the setting of the guiding plate provides a stable sliding path for the adjusting plate, ensuring that the adjusting plate will not deviate during the movement, thereby improving the accuracy of the operation of blocking or opening the light of the light-emitting plate by the light-shielding plate. The plane of one side of the limiting plate away from the covering cover is tangent to the rotating rod. When it is necessary to completely block the light, the light-shielding plate fits with the limiting plate, and at the same time, the light-shielding plate also fits with the rotating rod, thereby realizing the complete blocking of the light source, improving the light-shielding effect, and further improving the accuracy of spectral tuning.

[0015] Optionally, a light source cavity is formed between the covering cover and the light source cover, the light-emitting plate is located in the light source cavity, a micro thermoelectric cooling device is arranged in the light source cavity, the micro thermoelectric cooling device is fixed in the light source cavity, the micro thermoelectric cooling device is provided with a cold end, and the cold end of the micro thermoelectric cooling device is attached to the side of the light-emitting plate away from the light source.

[0016] By adopting the above technical solutions, the micro thermoelectric cooling device can effectively reduce the working temperature of the light-emitting plate, improve the spectral stability, thereby reducing the spectral deviation caused by temperature change, further improving the color accuracy. At the same time, it helps to extend the service life of the light-emitting plate and ensure the reliability and performance stability of the backlight module during long-term operation.

[0017] Optionally, the air on the side of the light-emitting plate where the light source is installed is in air flow communication with the side away from the light source in the light source cavity.

[0018] By adopting the above technical solutions, it promotes the air flow inside the light source cavity, forms a good heat dissipation cycle, enables the heat on the light source side of the light-emitting plate to flow to the micro thermoelectric cooling device through air circulation for cooling, thereby reducing the working temperature of the light-emitting plate.

[0019] Optionally, the groove wall of the light source groove is located between the top wall and the bottom wall of the light guide plate, and the center position of the width of the light source groove is located at one-third of the thickness of the light guide plate close to the bottom.

[0020] By adopting the above technical solution, the setting of the light source groove optimizes the propagation path of light in the light guide plate. The center position of its width is located at one-third of the thickness of the light guide plate near the bottom, which can effectively control the light emission angle and distribution range, reduce the problem of uneven light spots, improve the uniform light illumination effect formed on the surface of the light guide plate, and thus enhance the overall display quality.

[0021] Optionally, the optical film group includes a reflective film, a diffusion film, a foam adhesive, and a brightness enhancement film. The reflective film, the light guide plate, the diffusion film, and the brightness enhancement film are arranged in sequence. The diffusion film and the reflective film are connected by the foam adhesive, and a light mixing cavity is formed between the diffusion film and the reflective film. The light guide plate is located in the light mixing cavity, and convex dots are provided on the side of the light guide plate close to the reflective film.

[0022] By adopting the above technical solution, the combined design of the reflective film, the diffusion film, the foam adhesive, and the brightness enhancement film can effectively improve the light uniformity and mixing effect. The reflective film is used to improve the light utilization rate and reduce light loss. Specifically, the diffusion film further optimizes the light distribution to make the emitted light more uniform, and the brightness enhancement film enhances the brightness and improves the display effect. In addition, the light mixing cavity formed between the diffusion film and the reflective film provides sufficient mixing space for light to ensure the uniform mixing of different color lights. The convex dots provided on the side of the light guide plate close to the reflective film are beneficial to correcting the light propagation path and improving the light uniformity and overall display quality.

[0023] Optionally, the convex dots are distributed sparsely in the central region and densely in the edge region.

[0024] By adopting the above technical solution, the light density in the central region is moderate, reducing the problem of uneven brightness caused by excessive concentration. The dense distribution in the edge region effectively compensates for the lack of edge light, thereby comprehensively improving the overall light illumination uniformity of the backlight module and ensuring the quality and consistency of the display screen.

[0025] In summary, the present application includes at least one of the following beneficial technical effects: 1. The adjustment mechanism can achieve independent and precise control of the light transmission amount for light-emitting plates of different colors, thereby dynamically adjusting the spectral output according to the ambient light conditions, effectively avoiding color deviation or contrast reduction problems in the display screen caused by inaccurate spectral tuning. At the same time, the sensing mechanism monitors the ambient light conditions in real time and feeds the data back to the main control unit, enabling the module to have a fast response ability to environmental changes, further improving the display effect and driving safety; 2. The driving component, covering cover, light-shielding plate, and adjusting plate in the adjusting mechanism cooperate with each other to achieve precise control of the light transmission amount of light-emitting plates of different colors. The design of the sliding connection between the light-shielding plate and the covering cover, combined with the precise movement of the adjusting plate, can flexibly adjust the position of the light-shielding plate, thereby realizing the operation of blocking or opening the light of the light-emitting plate. This not only improves the accuracy of spectral tuning but also enhances the response speed and stability of the system, effectively reducing the spectral deviation problem caused by LED individual differences or driving current fluctuations, and significantly improving the color accuracy and contrast effect of the display screen; 3. The micro thermoelectric cooling device can effectively reduce the working temperature of the light-emitting plate, improve spectral stability, thereby reducing the spectral deviation caused by temperature changes, further enhancing color accuracy. At the same time, it helps to extend the service life of the light-emitting plate and ensure the reliability and performance stability of the backlight module during long-term operation. Description of the Drawings

[0026] Figure 1 It is a schematic internal view of the overall structure in the embodiment of the present application.

[0027] Figure 2 It is a schematic internal view of the overall structure in the embodiment of the present application.

[0028] Figure 3 It is Figure 1 The enlarged view of part A in

[0029] Figure 4 It is a schematic structural view of the adjusting mechanism in the embodiment of the present application.

[0030] Figure 5 It is Figure 4 The enlarged view of part B in

[0031] Description of the Reference Numerals: 1. Housing; 2. Light source cover; 21. Installation groove; 22. Light source groove; 3. Light-emitting plate; 4. Adjusting mechanism; 41. Covering cover; 411. Light-emitting groove; 42. Light-shielding plate; 421. Sliding groove; 43. Adjusting plate; 44. Connecting plate; 45. Rotating rod; 46. Guide plate; 47. Limiting plate; 5. Optical film group; 51. Reflective film; 52. Diffusion film; 53. Foam adhesive; 54. Brightening film; 6. Light guide plate; 7. Micro thermoelectric cooling device. Detailed Embodiment

[0032] The following Figures 1-5 further elaborates on the present application in detail with reference to the attached

[0033] The embodiment of the present application discloses a COB vehicle-mounted backlight module.

[0034] Refer to Figure 1 and Figure 2, the COB on-vehicle backlight module provided by this application includes a housing 1, a light source cover 2, a light-emitting source, an adjustment mechanism 4, a main control unit, and a sensing mechanism. The housing 1 serves as the external frame of the overall structure and is made of aluminum alloy material, having good heat dissipation performance and impact resistance. An optical film stack 5 is installed inside the housing 1. The light source cover 2 is fixedly connected to the inner wall of the housing 1. An installation groove 21 is formed through one side of the light source cover 2, and the light-emitting source is installed in the installation groove 21. The light-emitting source includes multiple light-emitting plates 3 of different colors, such as red, green, blue, and white light-emitting plates 3. In this example, there are four light-emitting plates 3, and each light-emitting plate 3 is made in the way of combining a circuit board and a bulb. Further, the color of each light-emitting plate 3 is the same, and the colors of the four light-emitting plates 3 are red, green, blue, and white respectively. A light source groove 22 is formed on the groove wall of the installation groove 21, and the light-emitting plate 3 emits light from the light source cover 2 through the light source groove 22. A light guide plate 6 is arranged on the light-emitting side of the light source groove 22, so that the light source emitted from the light source groove 22 is projected onto the light guide plate 6. The adjustment mechanism 4 is used to separately adjust the light transmission amount of different color light-emitting plates 3 to achieve precise spectral tuning. The main control unit is used to control the action of the adjustment mechanism 4 according to the ambient light conditions. In this example, the main control unit uses a high-performance microprocessor, supporting high-speed operation and multi-task processing. The sensing mechanism is used to sense the ambient light conditions and transmit the sensing data to the main control unit. In this example, the sensing mechanism selects a high-precision photoelectric sensor, having the ability of wide-range light detection, so as to achieve the effects of adaptive spectral tuning and efficient thermal management.

[0035] To facilitate dissipating the heat generated by the light emission of the light-emitting plate 3 to the external environment and improve the service life of the module, the housing 1 is made of aluminum alloy material, having good heat dissipation performance and impact resistance.

[0036] To improve the uniform mixing of the light source, the light-emitting plate 3 is a long strip plate type. Four light-emitting plates 3 of different colors, namely red, green, blue, and white, are arranged in sequence in an arc shape and the light irradiation directions pass through the center of the circle, which helps to optimize the light convergence effect, reduce light loss, and thus improve the brightness and display quality of the overall backlight module.

[0037] Specifically, referring to Figures 3 to 5 , the adjustment mechanism 4 includes a driving component, a covering cover 41, a light-shielding plate 42, and an adjustment plate 43. The covering cover 41 is fixedly connected to the inner wall of the light source cover 2 by screws. The covering cover 41 covers the light-emitting plate 3. The covering cover 41 is provided with light-emitting grooves 411, which are equidistantly distributed along the length direction of the light-emitting plate 3. The light-shielding plate 42 is slidably connected to the covering cover 41, and the adjustment plate 43 is slidably connected to the light source cover 2. The driving component is used to drive the adjustment plate 43 to move, so that the light-shielding plate 42 blocks or opens the light of the light-emitting plate 3.

[0038] On one side of the covering cover 41 away from the light source groove 22, there is a connecting plate 44. The connecting plate 44 is used to connect all the adjusting plates 43 of the same adjusting mechanism 4. The driving component is used to drive the connecting plate 44 to move directionally, so that the connecting rod moves towards or away from the covering cover 41. The outer wall of the adjusting plate 43 is hinged to one end side of the light shielding plate 42. The covering cover 41 is rotatably connected with a rotating rod 45. The light outlet groove 411 is square-shaped, and the rotating rod 45 is located at the light outlet groove 411. When the light outlet groove 411 is completely blocked, the two light shielding plates 42 are in contact with each other. The light shielding plate 42 is provided with a sliding groove 421, and the rotating rod 45 is inserted into the sliding groove 421. When blocking the light outlet groove 411, the driving component drives the adjusting plate 43 to move. The movement of the adjusting plate 43 drives the light shielding plate 42 to move. Under the action of the rotating rod 45, the rotating rod 45 slides in the sliding groove 421 to limit the movement of the light shielding plate 42. At the same time, the light shielding plate 42 moves towards the center of the light outlet groove 411 until the two adjacent light shielding plates 42 at the light outlet groove 411 are in contact with each other, so as to realize blocking the light outlet groove 411.

[0039] In this embodiment, the driving component adopts a driving structure combining a driving motor and a transmission lead screw to drive the movement of the connecting plate 44, and the driving motor is installed on the outer wall of the housing 1. Specifically, a notch for the connecting plate 44 to slide through can be formed through the inner wall of the housing 1, so that the driving motor is installed on the outer wall of the housing 1, which is not shown in the figure.

[0040] Furthermore, a guiding plate 46 is fixedly connected to the side of the covering cover 41 close to the adjusting plate 43. The adjusting plate 43 is slidably connected to the guiding plate 46, so that the guiding plate 46 can guide the sliding direction of the adjusting plate 43, reducing the possibility that the light shielding effect of the light shielding plate 42 is reduced due to the deviation of the sliding direction of the adjusting plate 43. A limiting plate 47 is fixedly connected to the side of the covering cover 41 close to the guiding plate 46. The side of the limiting plate 47 away from the covering plate is in a shape of a runway circle. The side of the limiting plate 47 away from the covering cover 41 is tangent to the rotating rod 45 in the horizontal plane. When the light outlet groove 411 is completely closed, the side of the light shielding plate 42 close to the covering cover 41 is in contact with the rotating rod 45 and the limiting plate 47, thereby reducing the possibility of light leakage.

[0041] Specifically, a light source cavity is formed between the covering hood 41 and the light source hood 2. The light emitting plate 3 is located in the light source cavity. A micro thermoelectric cooling device 7 is provided in the light source cavity. The micro thermoelectric cooling device 7 is fixed to the inner wall of the light source cavity. The micro thermoelectric cooling device has a cold end and a hot end. The cold end of the micro thermoelectric cooling device 7 is attached to the side of the light emitting plate 3 away from the light source. The hot end of the micro thermoelectric cooling device 7 penetrates through the light source hood 2, so that the hot end of the micro thermoelectric cooling device 7 is located outside the light source cavity, facilitating the temperature reduction treatment of the structure in the light source cavity. The micro thermoelectric cooling device 7 uses a semiconductor temperature control device, which has the characteristics of fast response and high-efficiency heat dissipation. For example, a thermoelectric module using the Peltier effect principle effectively reduces the working temperature of the light emitting plate 3 and extends the service life. The side of the light emitting plate 3 where the light source is installed and the side away from the light source are in air flow communication in the light source cavity. The design of air flow communication can promote heat dissipation and further improve the heat dissipation effect.

[0042] A heat conductive silicone grease is coated on the side of the micro thermoelectric cooling device 7 close to the light emitting plate 3 to enhance the heat transfer effect.

[0043] The groove wall of the light source groove 22 is located between the top wall and the bottom wall of the light guide plate 6, and the width center position of the light source groove 22 is located at one-third of the thickness of the light guide plate 6 close to the bottom, effectively guiding the light propagation direction, improving the light utilization rate, and at the same time, the groove wall is coated to reduce the light absorption loss.

[0044] Further, referring to Figure 1 , the optical film group 5 includes a reflective film 51, a diffusion film 52, a foam adhesive 53 and a brightness enhancement film 54. The reflective film 51, the light guide plate 6, the diffusion film 52 and the brightness enhancement film 54 are arranged in sequence. The diffusion film 52 and the reflective film 51 are connected by the foam adhesive 53 and adhered to the inner wall of the housing 1. The light guide plate 6 and the light source hood 2 are both adhered to the inner wall of the housing 1 by the foam adhesive 53. A light mixing cavity is formed between the diffusion film 52 and the reflective film 51. The light guide plate 6 is located in the light mixing cavity. The side of the light guide plate 6 close to the reflective film 51 is provided with convex dots, and the convex dots are distributed sparsely in the central area and densely in the edge area. It can effectively mix light and improve the light uniformity.

[0045] The implementation principle of a COB vehicle-mounted backlight module in this application is as follows: The sensing mechanism detects the current light condition, and the sensing mechanism transmits the sensed data to the main control unit. The main control unit controls the driving component. When it is necessary to reduce the light transmission amount, the driving component drives the connecting plate 44 to move towards the direction close to the covering cover 41. The movement of the connecting plate 44 drives the adjusting rod to move, so that the included angle between the adjusting rod and the side of the light-shielding plate 42 close to the bulb of the light-emitting plate 3 is reduced. The rotating rod 45 slides in the sliding groove 421 to guide the moving direction of the light-shielding plate 42, so that the light-shielding plate 42 moves towards the middle direction of the light-emitting groove 411, thereby blocking the notch of the light-emitting groove 411, and thus reducing the light transmission amount of the light-emitting plate 3. When it is necessary to increase the light transmission amount, the driving component drives the connecting plate 44 to move towards the direction away from the covering cover 41. Thus, independent and precise control of the light transmission amount is achieved, so that the spectral output can be dynamically adjusted according to the ambient light condition, effectively avoiding problems such as color cast or contrast reduction of the display screen due to inaccurate spectral tuning, and thus adjusting the spectrum and realizing adaptive spectral tuning.

[0046] The above are all the preferred embodiments of this application. This embodiment is only an explanation of this application and does not limit the protection scope of this application in turn. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A COB vehicle backlight module, characterized in that, Comprising: A housing (1) with an optical film group (5) disposed therein; A light source cover (2) installed inside the housing (1). The light source cover (2) is provided with an installation groove (21). A light source groove (22) is provided on the groove wall of the installation groove (21). A light guide plate (6) is provided on the light-emitting side of the light source groove (22); A light-emitting source installed in the installation groove (21). The light-emitting source includes a plurality of light-emitting plates (3) of different colors; An adjustment mechanism (4) for individually adjusting the light transmission amount of the light-emitting plates (3) of different colors; A main control unit for controlling the operation of the adjustment mechanism (4) according to the ambient light conditions; A sensing mechanism for sensing the ambient light conditions and transmitting the sensed data to the main control unit.

2. The COB vehicle backlight module according to claim 1, wherein The light-emitting plates (3) are distributed in an arc shape and the light irradiation direction passes through the center of the circle.

3. A COB vehicle backlight module according to claim 1, characterized in that, The adjustment mechanism (4) includes a driving component, a covering cover (41), a light-shielding plate (42), and an adjustment plate (43). The covering cover (41) is connected to the light source cover (2). The covering cover (41) covers the light-emitting plates (3). The covering cover (41) is provided with light-emitting grooves (411) which are equidistantly distributed along the length direction of the light-emitting plates (3). The light-shielding plate (42) is slidably connected to the covering cover (41). The adjustment plate (43) is slidably connected to the light source cover (2). The driving component is used to drive the adjustment plate (43) to move so that the light-shielding plate (42) blocks or opens the light of the light-emitting plates (3).

4. The COB vehicle-mounted backlight module according to claim 3, characterized in that, One side of the covering cover (41) is provided with a connecting plate (44) which is used to connect all the adjustment plates (43) of the same adjustment mechanism (4). The adjustment plate (43) is hinged to the light-shielding plate (42). A rotating rod (45) is rotatably connected to the covering cover (41). The light-shielding plate (42) is provided with a sliding groove (421) into which the rotating rod (45) is inserted.

5. The COB on-vehicle backlight module according to claim 4, wherein, The covering cover (41) is connected with a guide plate (46). The adjustment plate (43) is slidably connected to the guide plate (46). The covering cover (41) is connected with a limiting plate (47). The plane on the side of the limiting plate (47) away from the covering cover (41) is tangent to the rotating rod (45).

6. The COB on-vehicle backlight module according to claim 3, wherein, A light source cavity is formed between the covering cover (41) and the light source cover (2). The light-emitting plates (3) are located in the light source cavity. A micro thermoelectric cooling device (7) is provided in the light source cavity. The micro thermoelectric cooling device (7) is fixed in the light source cavity. The micro thermoelectric cooling device (7) is provided with a cold end. The cold end of the micro thermoelectric cooling device (7) is attached to the side of the light-emitting plate (3) away from the light source.

7. The COB on-vehicle backlight module according to claim 5, characterized in that, The air flow on the side of the light-emitting plate (3) where the light source is installed is communicated with the air flow on the side away from the light source in the light source cavity.

8. The COB vehicle backlight module according to claim 1, wherein The groove wall of the light source groove (22) is located between the top wall and the bottom wall of the light guide plate (6), and the width center position of the light source groove (22) is located at one-third of the thickness of the light guide plate (6) close to the bottom.

9. The COB on-vehicle backlight module according to claim 1, wherein, The optical film group (5) includes a reflective film (51), a diffusion film (52), a foam adhesive (53), and a brightness enhancement film (54). The reflective film (51), the light guide plate (6), the diffusion film (52), and the brightness enhancement film (54) are arranged in sequence. The diffusion film (52) and the reflective film (51) are connected by the foam adhesive (53), and a light mixing cavity is formed between the diffusion film (52) and the reflective film (51). The light guide plate (6) is located in the light mixing cavity, and convex dot patterns are provided on the side of the light guide plate (6) close to the reflective film (51).

10. A COB vehicle backlight module according to claim 7, characterized in that, The convex dot patterns are distributed with sparse in the central region and dense in the edge region.

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