Backlight module and liquid crystal display

Abstract

The utility model relates to a backlight module and a liquid crystal display. The backlight module comprises a light source, a primary array lens, a secondary microstructure lens, a diffusion film, a base and an outer frame, the base is connected with the outer frame, and a mounting cavity is formed between the base and the outer frame; the light source, the first-stage array lens, the second-stage microstructure lens and the diffusion film are all arranged in the mounting cavity, the light source is connected with the base, the first-stage array lens is arranged on the face, back to the base, of the light source, the second-stage microstructure lens is connected with the outer frame, the second-stage microstructure lens is arranged on the side, back to the light source, of the first-stage array lens, and the diffusion film is connected with the second-stage microstructure lens. The second-level microstructure lens and the first-level array lens are arranged at an interval, and the diffusion film is arranged on the side, opposite to the first-level array lens, of the second-level microstructure lens. Under the condition of ensuring uniform light, the number of the diffusion films is reduced, so that light loss is reduced, the intensity of emergent light is ensured, the power of a light source does not need to be improved, the heat productivity is reduced, the sizes of the backlight module and the liquid crystal display are effectively reduced, and the manufacturing cost is effectively reduced.

Description

Technical Field

[0001] This utility model relates to the field of backlight technology, and in particular to a backlight module and a liquid crystal display. Background Technology

[0002] Traditional PHUD (Panoramic Head-Up Display) backlight modules typically employ a four-layer diffuser structure. Light emitted from LEDs (Light Emitting Diodes) is diffused sequentially through a diffuser plate and four diffuser films. These four films are: a DBEF (Diverter-Offset Emitting) polarizer, a 90-degree BEF (Brightness Enhancer Emitting) film, a 0-degree BEF film, and the diffuser film itself. The combination of a diffuser plate and four different diffuser films is used to improve uniformity. However, the diffuser plate and films result in significant light loss. To compensate for this, the LED power needs to be increased. This increased power leads to increased heat generation, necessitating a heat sink and cooling fan in the base for heat dissipation. This structure results in a large backlight module size, occupying a significant amount of space, which severely limits its application in automobiles. Many car models cannot install PHUD systems due to space constraints, and this solution is also costly to manufacture. Utility Model Content

[0003] Therefore, it is necessary to provide a backlight module and a liquid crystal display.

[0004] A backlight module includes a light source, a primary array lens, a secondary microstructure lens, a diffusion film, a base, and an outer frame;

[0005] The base and the outer frame are connected, and a mounting cavity is formed between the base and the outer frame;

[0006] The light source, the primary array lens, the secondary microstructure lens, and the diffusion film are all disposed within the mounting cavity. The light source is connected to the base. The primary array lens is disposed on the side of the light source facing away from the base. The secondary microstructure lens is connected to the outer frame. The secondary microstructure lens is disposed on the side of the primary array lens facing away from the light source. The secondary microstructure lens and the primary array lens are spaced apart. The diffusion film is disposed on the side of the secondary microstructure lens facing away from the primary array lens.

[0007] In one embodiment, the primary array lens includes a primary carrier plate and a plurality of primary lenses, each of the primary lenses being arranged in an array on the side of the primary carrier plate facing away from the light source.

[0008] In one embodiment, each of the primary lenses is provided with an arcuate convex shape on the side of the primary carrier plate facing away from the light source.

[0009] In one embodiment, the light source includes a lamp panel and a plurality of LEDs disposed on the lamp panel, wherein each primary lens is aligned with one of the LEDs.

[0010] In one embodiment, the secondary microstructure lens has a first light-transmitting microstructure on the side facing the light source, and a second light-transmitting microstructure on the side facing away from the light source, wherein the extension directions of the first light-transmitting microstructure and the extension directions of the second light-transmitting microstructure are perpendicular to each other.

[0011] In one embodiment, the primary array lens includes a primary carrier plate and a plurality of primary lenses, each of the primary lenses being arranged in an array on the side of the primary carrier plate facing away from the light source, wherein the width of the first light-transmitting microstructure and the width of the second light-transmitting microstructure are smaller than the width of the primary lenses.

[0012] In one embodiment, the shape of the first light-transmitting microstructure includes multiple rows of first light-transmitting strips, each of which extends along a first direction; the shape of the second light-transmitting microstructure includes multiple rows of second light-transmitting strips, each of which extends along a second direction, wherein the first direction is perpendicular to the second direction.

[0013] In one embodiment, the cross-sectional shape of each of the first light-transmitting strips is semi-circular or V-shaped, and the cross-sectional shape of each of the second light-transmitting strips is semi-circular or V-shaped.

[0014] In one embodiment, the distance between the primary array lens and the secondary microstructure lens is greater than the distance between the secondary microstructure lens and the diffusion film.

[0015] A liquid crystal display, comprising the backlight module described in any of the above embodiments.

[0016] The aforementioned backlight module and LCD display utilize a primary array lens to diffuse the emitted light source to a secondary microstructure lens. The secondary microstructure lens refracts light from different angles into collimated light that enters the diffusion film. After homogenization by the diffusion film, the light is directly projected onto the screen. Compared to traditional backlight modules, this design reduces the number of diffusion films while maintaining uniform light distribution, thereby reducing light loss and ensuring the intensity of the emitted light. Furthermore, it eliminates the need to increase the power of the light source, reducing heat generation. Therefore, it eliminates the need for heat sinks and cooling fans, effectively reducing the size of the backlight module and LCD display, significantly lowering manufacturing costs, and improving the applicability of the backlight module in vehicles. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a cross-sectional structural diagram of a backlight module according to an embodiment;

[0019] Figure 2 This is a partial cross-sectional structural diagram of a backlight module according to an embodiment;

[0020] Figure 3A This is a schematic diagram of one side of a secondary microstructure lens according to an embodiment;

[0021] Figure 3B This is a schematic diagram of the other side of a secondary microstructure lens according to one embodiment.

[0022] Explanation of reference numerals in the attached figures:

[0023] 10. Backlight module; 200. Light source; 210. Lamp board; 220. Lamp chip; 110. Base; 120. Outer frame; 101. Mounting cavity; 310. Primary array lens; 311. Primary carrier plate; 312. Primary lens; 400. Secondary microstructure lens; 421. First light transmission strip; 422. Second light transmission strip; 510. Diffuser film; Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0025] like Figure 1 and Figure 2 As shown, it is a backlight module 10 according to an embodiment of the present invention, including: a light source 200, a primary array lens 310, a secondary microstructure lens 400, a diffusion film 510, a base 110 and an outer frame 120.

[0026] The base 110 and the outer frame 120 are connected, and a mounting cavity 101 is formed between the base 110 and the outer frame 120;

[0027] The light source 200, the primary array lens 310, the secondary microstructure lens 400, and the diffusion film 510 are all disposed within the mounting cavity 101. The light source 200 is connected to the base 110. The primary array lens 310 is disposed on the side of the light source 200 facing away from the base 110. The secondary microstructure lens 400 is connected to the outer frame 120. The secondary microstructure lens 400 is disposed on the side of the primary array lens 310 facing away from the light source 200. The secondary microstructure lens 400 and the primary array lens 310 are spaced apart. The diffusion film 510 is disposed on the side of the secondary microstructure lens 400 facing away from the primary array lens 310.

[0028] In this embodiment, the primary array lens 310 is used to diffuse the light from the light source 200, and the secondary microstructure lens 400 is used to diffuse the light and convert it into quasi-linear light, so that the light rays incident on the diffusion film 510 tend to be parallel, and then the collimated light is transmitted to the outside through the diffusion film 510.

[0029] In this embodiment, the light source 200 is an LED light source 200. Specifically, the light source 200 includes a lamp board 210 and a plurality of LED beads 220 disposed on the lamp board 210. Each LED bead 220 is an LED bead 220, and the LED beads 220 are arranged in an array on the lamp board 210. Specifically, the light source 200, the primary array lens 310, the secondary microstructure lens 400, and the diffusion film 510 are sequentially installed in the mounting cavity 101. The primary array lens 310 is disposed close to the light source 200, and the secondary microstructure lens 400 and the diffusion film 510 are sequentially disposed on the side of the primary array lens 310 away from the light source 200. In this way, the light emitted by the light source 200 is transmitted to the outside through the primary array lens 310, the secondary microstructure lens 400, and the diffusion film 510 in sequence.

[0030] Since the light from the light source 200 only needs to pass through the primary array lens 310, the secondary microstructure lens 400, and the diffusion film 510 to reach the outside, and because the primary array lens 310 and the secondary microstructure lens 400 have better diffusion and collimation effects, the light is more uniform, thus effectively reducing the number of diffusion films 510 required. Compared with traditional structures, the light passes through fewer light-transmitting components, resulting in higher intensity transmitted light. Therefore, there is no need to increase the power of the light source 200, reducing the heat generated by increasing power. Consequently, there is no need to install heat sinks and cooling fans, effectively reducing the size of the backlight module 10 and the LCD display, and effectively lowering manufacturing costs.

[0031] In the above embodiment, the light source 200 is diffused by the primary array lens 310 to the secondary microstructure lens 400. The secondary microstructure lens 400 refracts light from different angles into collimated light that enters the diffusion film 510. After homogenization by the diffusion film 510, the light is directly projected onto the screen. Compared with the traditional backlight module 10, the number of diffusion films 510 is reduced while ensuring uniform light, thereby reducing light loss and ensuring the intensity of the emitted light. Consequently, there is no need to increase the power of the light source 200, reducing heat generation. Therefore, there is no need to set up heat sinks and cooling fans, effectively reducing the size of the backlight module 10 and the liquid crystal display, effectively reducing manufacturing costs, and improving the applicability of the backlight module in vehicles.

[0032] By adopting the light-transmitting structure of the first-level array lens 310, the second-level microstructure lens 400, and the diffusion film 510, the thickness of the backlight module can be controlled at 25mm, and the thickness including the pillar is 27mm, making the overall thickness of the backlight module extremely small, which can be flexibly installed in different car models.

[0033] In one embodiment, please see again Figure 2 The primary array lens includes a primary carrier plate 311 and a plurality of primary lenses 312. Each primary lens 312 is arranged in an array on the side of the primary carrier plate 311 facing away from the light source 200. Each primary lens 312 is aligned with one of the lamp beads 220. In this way, each primary lens 312 can diffuse the light of one lamp bead 220, thereby making the light passing through the primary lens 312 dispersed in a planar manner.

[0034] In this embodiment, each primary lens 312 on the primary array lens 310 is aligned with a lamp bead 220 to disperse and diffuse the light from the lamp bead 220. After being dispersed by the primary lenses 312 of the primary array lens 310, the light from each lamp bead 220 can be diffused more evenly, so that the light is dispersed in a planar manner in the secondary microstructure lens 400, avoiding the light from propagating to the secondary microstructure lens 400 in a point-like manner.

[0035] To improve the light diffusion effect of the first-stage lens 312, in one embodiment, such as Figure 2 As shown, each of the primary lenses 312 is convexly arranged on the side of the primary carrier plate 311 facing away from the light source 200. In this embodiment, the primary lens 312 is hemispherical. In this embodiment, one side of the primary lens 312 is connected to the primary carrier plate 311, and the side of the primary lens 312 facing away from the primary carrier plate 311 is convex. The convex surface of the primary lens 312 is an arcuate surface. By setting the primary lens 312 as a hemispherical lens with an arcuate surface, the light from the light source 200 can be effectively diffused.

[0036] In one embodiment, such as Figure 3A and Figure 3B As shown, the secondary microstructure lens 400 has a first light-transmitting microstructure on the side facing the light source 200, and a second light-transmitting microstructure on the side facing away from the light source 200. The extension directions of the first light-transmitting microstructure and the extension directions of the second light-transmitting microstructure are perpendicular to each other.

[0037] In this embodiment, the side of the secondary microstructure lens 400 facing the light source 200 is the incident surface, and the side of the secondary microstructure lens 400 facing away from the light source 200 is the emitting surface. The first light-transmitting microstructure of the incident surface of the secondary microstructure lens 400 diffuses the light rays in the Y-axis direction, and the second microstructure of the emitting surface diffuses the light rays in the X-axis direction. This allows the light to be diffused in both the X-axis and Y-axis directions, ensuring that the light passing through the secondary microstructure lens 400 is fully diffused and dispersed. It also effectively reduces the degree of bright and dark seams generated at the light splicing points, making the diffused light more uniform.

[0038] In one embodiment, the primary array lens includes a primary carrier plate 311 and a plurality of primary lenses 312. Each of the primary lenses 312 is arranged in an array on the side of the primary carrier plate 311 facing away from the light source 200. The width of the first light-transmitting microstructure and the width of the second light-transmitting microstructure are smaller than the width of the primary lens 312.

[0039] In this embodiment, the widths of the first and second light-transmitting microstructures on the secondary microstructure lens 400 refer to their widths in the direction perpendicular to their extension. Because the widths of the first and second light-transmitting microstructures are relatively small, they can effectively diffuse light, resulting in more uniform light emission. It should be understood that each of the first and second light-transmitting microstructures comprises multiple tiny microstructure units. The smaller the width of the microstructure, the more microstructure units there are. By having more microstructure units disperse and diffuse the originally dense light, the light emission becomes more uniform, and the dark areas in the seams between bright and dark areas are further compensated for, resulting in more uniform overall backlight brightness.

[0040] In one embodiment, such as Figure 3A and Figure 3B As shown, the shape of the first light-transmitting microstructure includes multiple rows of first light-transmitting strips 421, each of which extends along a first direction. The shape of the second light-transmitting microstructure includes multiple rows of second light-transmitting strips 422, each of which extends along a second direction. The first direction is perpendicular to the second direction.

[0041] The secondary microstructure lens 400 includes a secondary carrier plate, a first light-transmitting microstructure disposed on the side of the secondary carrier plate facing the light source 200, and a second light-transmitting microstructure disposed on the side of the secondary carrier plate facing away from the light source 200. The first direction and the second direction are two mutually perpendicular directions parallel to the secondary carrier plate. In this embodiment, the first direction is taken as the X direction and the second direction as the Y direction. Thus, each of the first light-transmitting strips 421 extends along the X-axis direction and is arranged parallel to each other in the Y-axis direction. Each of the second light-transmitting strips 422 extends along the Y-axis direction and is arranged parallel to each other in the X-axis direction. In this way, the first light-transmitting strip 421 diffuses the light angle in the Y-axis direction, and the second light-transmitting strip 422 diffuses the light angle in the X-axis direction. Since the first light-transmitting strip 421 and the second light-transmitting strip 422 are located on two opposite sides of the same secondary carrier plate, the incident light diffuses along the Y-axis, and the emitted light diffuses along the X-axis, thereby effectively eliminating the bright and dark seams and making the emitted light more uniform.

[0042] It is worth mentioning that both the first and second light-transmitting microstructures are microstructures. Therefore, the width or diameter of the microstructure is less than 0.3 mm. In some embodiments, the width or diameter of the microstructure is less than or equal to 0.3 mm and greater than 0.05 mm. That is, the width of the first light-transmitting strip 421 and the second light-transmitting strip 422 is less than or equal to 0.3 mm and greater than 0.05 mm. It should be understood that within a certain range, the smaller the width of the microstructure, the better the light diffusion effect, and the better it can effectively eliminate the bright and dark seams at the seams. However, the width of the microstructure cannot be too small. If the microstructure is too small, the surface of the secondary microstructure lens 400 will tend to be smooth, and a good diffusion effect cannot be formed. Therefore, in this embodiment, the width of the first light-transmitting strip 421 and the second light-transmitting strip 422 is less than or equal to 0.3 mm and greater than 0.05 mm, which not only achieves a good diffusion effect but also effectively eliminates the bright and dark seams at the seams.

[0043] In one embodiment, the cross-sectional shape of each of the first light-transmitting strips 421 is semi-circular or V-shaped, and the cross-sectional shape of each of the second light-transmitting strips 422 is semi-circular or V-shaped.

[0044] In this embodiment, the cross-sectional shape of the first light-transmitting strip 421 and the second light-transmitting strip 422 is cylindrical, semi-cylindrical, or V-shaped, so that light can diffuse along the surface of the light-transmitting strip to different directions, thereby making the light diffusion effect better.

[0045] In one embodiment, the distance between the primary array lens 310 and the secondary microstructure lens 400 is greater than the distance between the secondary microstructure lens 400 and the diffusion film 510.

[0046] In this embodiment, the distance between the primary array lens 310 and the secondary microstructure lens 400 is relatively large, which is beneficial for the primary lens 312 to fully diffuse the light, allowing the light from each LED 220 to diffuse to a wider angle. Meanwhile, the distance between the secondary microstructure lens 400 and the diffusion film 510 is relatively small, which is beneficial for reducing light loss and increasing light intensity. This results in both more uniform light emission and increased light intensity.

[0047] In one embodiment, the distance L between the primary array lens 310 and the secondary microstructure lens 400 is 3 to 5 times the width D of the primary lens 312. In this embodiment, by setting the distance L between the primary array lens 310 and the secondary microstructure lens 400 to 3 to 5 times the width D of the primary lens 312, it is beneficial for light to be fully diffused and scattered to the secondary microstructure lens 400 after passing through the primary lens 312, thereby resulting in more uniform light output.

[0048] In one embodiment, a liquid crystal display is provided, including the backlight module described in any of the above embodiments.

[0049] In this embodiment, the liquid crystal display is a PHUD liquid crystal display. The liquid crystal display includes a TFT (Thin Film Transistor) screen, a primary array lens that diffuses the light emitted by the LED to a secondary microstructure lens, the secondary microstructure lens refracts light from different angles into collimated light that enters the diffusion film, and the diffusion film homogenizes the light before it is directly projected onto the TFT screen.

[0050] In this embodiment, a primary array lens diffuses the light emitted from the light source to a secondary microstructure lens. The secondary microstructure lens refracts light from different angles into collimated light that enters the diffusion film. After homogenization by the diffusion film, the light is directly projected onto the screen. Compared to traditional backlight modules, this method reduces the number of diffusion films while ensuring uniform light distribution, thereby reducing light loss and maintaining the intensity of the emitted light. Furthermore, it eliminates the need to increase the power of the light source, reducing heat generation. Therefore, it eliminates the need for heat sinks and cooling fans, effectively reducing the size of the backlight module and the LCD display, and significantly lowering manufacturing costs.

[0051] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0052] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A backlight module, characterized in that, include: Light source, primary array lens, secondary microstructure lens, diffusion film, base and outer frame; The base and the outer frame are connected, and a mounting cavity is formed between the base and the outer frame; The light source, the primary array lens, the secondary microstructure lens, and the diffusion film are all disposed within the mounting cavity. The light source is connected to the base. The primary array lens is disposed on the side of the light source facing away from the base. The secondary microstructure lens is connected to the outer frame. The secondary microstructure lens is disposed on the side of the primary array lens facing away from the light source. The secondary microstructure lens and the primary array lens are spaced apart. The diffusion film is disposed on the side of the secondary microstructure lens facing away from the primary array lens.

2. The backlight module according to claim 1, characterized in that, The primary array lens includes a primary carrier plate and multiple primary lenses, with each primary lens arranged in an array on the side of the primary carrier plate facing away from the light source.

3. The backlight module according to claim 2, characterized in that, Each of the primary lenses is convex and curved on the side of the primary carrier plate facing away from the light source.

4. The backlight module according to claim 2, characterized in that, The light source includes a lamp panel and a plurality of lamp beads disposed on the lamp panel, wherein each primary lens is aligned with one of the lamp beads.

5. The backlight module according to any one of claims 1-4, characterized in that, The secondary microstructure lens has a first light-transmitting microstructure on the side facing the light source and a second light-transmitting microstructure on the side facing away from the light source. The extension directions of the first light-transmitting microstructure and the extension directions of the second light-transmitting microstructure are perpendicular to each other.

6. The backlight module according to claim 5, characterized in that, The primary array lens includes a primary carrier plate and multiple primary lenses. Each primary lens is arranged in an array on the side of the primary carrier plate facing away from the light source. The width of the first light-transmitting microstructure and the width of the second light-transmitting microstructure are smaller than the width of the primary lenses.

7. The backlight module according to claim 5, characterized in that, The shape of the first light-transmitting microstructure includes multiple rows of first light-transmitting strips, each of which extends along a first direction. The shape of the second light-transmitting microstructure includes multiple rows of second light-transmitting strips, each of which extends along a second direction. The first direction is perpendicular to the second direction.

8. The backlight module according to claim 7, characterized in that, The cross-sectional shape of each of the first light-transmitting strips is semi-circular or V-shaped, and the cross-sectional shape of each of the second light-transmitting strips is semi-circular or V-shaped.

9. The backlight module according to claim 1, characterized in that, The distance between the primary array lens and the secondary microstructure lens is greater than the distance between the secondary microstructure lens and the diffusion film.

10. A liquid crystal display, characterized in that, Includes the backlight module as described in any one of claims 1-9.

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