Backlight module and display device

Abstract

Embodiments of the present application provide a backlight module and a display device; the backlight module comprises a light source, an optical assembly and an optical film, the optical assembly is arranged on the light emitting direction of the light source, the optical assembly comprises a first substrate, a plurality of microlenses and a plurality of asymmetric structures, the microlenses and the asymmetric structures are arranged on both sides of the first substrate, and the optical film is arranged on the side of the optical assembly away from the light source. Embodiments of the present application set the optical assembly in the backlight module, and make the optical assembly directly contact with the optical film, the plurality of microlenses in the optical assembly can improve the transmittance, and can also play a role of light homogenization, so that the optical assembly can replace the diffusion plate, improve the light emitting efficiency of the backlight module, and through setting the asymmetric structure, one side of the asymmetric structure is arranged perpendicularly to the first substrate, and the other side of the asymmetric structure forms an acute angle with the first substrate, the light can be deflected through the asymmetric structure, so that the light emitted by the backlight module meets the requirements.

Description

Technical Field

[0001] This application relates to the field of display technology, and more particularly to a backlight module and a display device. Background Technology

[0002] With the rapid development of LCD technology, LCD screens have evolved from small-sized mobile phone screens to large-sized computer, television, and automotive screens, becoming a mainstream product in the display field. Current automotive LCD screens utilize Mini LED (Mini Light Emitting Diode) backlight modules paired with LCD panels. To improve brightness, the backlight module incorporates multiple optical films and uses a diffuser plate for support and light distribution. However, in practical use, it has been found that significant light loss occurs when passing through the diffuser plate, leading to higher power consumption and lower light extraction efficiency in the backlight module.

[0003] Therefore, existing liquid crystal display devices suffer from the technical problem of low light extraction efficiency of the backlight module. Summary of the Invention

[0004] This application provides a backlight module and a display device to improve the technical problem of low light extraction efficiency of backlight modules in existing liquid crystal display devices.

[0005] To achieve the above objectives, according to a first aspect of this application, a backlight module is provided, the backlight module comprising: light source; An optical component is disposed in the light emission direction of the light source. The optical component includes a first substrate, a plurality of microlenses and a plurality of asymmetric structures. The microlenses and the asymmetric structures are disposed on both sides of the first substrate. One side of the asymmetric structure is perpendicular to the first substrate, and the other side of the asymmetric structure forms an acute angle with the first substrate. An optical film is disposed on the side of the optical component away from the light source; The optical component is in direct contact with the optical film.

[0006] According to a second aspect of this application, a display device is provided, the display device including a backlight module as described in any of the above embodiments.

[0007] This application provides a backlight module and a display device. The backlight module includes a light source, an optical component, and an optical film. The optical component is disposed in the light emission direction of the light source and includes a first substrate, multiple microlenses, and multiple asymmetric structures. The microlenses and asymmetric structures are disposed on both sides of the first substrate, and the optical film is disposed on the side of the optical component away from the light source. By setting the optical component in the backlight module and making the optical component directly contact the optical film, the multiple microlenses in the optical component can improve the transmittance and play a role in light uniformity. This allows the optical component to replace the diffuser plate, improving the light emission efficiency of the backlight module. Furthermore, by setting the asymmetric structure, one side of the asymmetric structure is perpendicular to the first substrate, and the other side of the asymmetric structure forms an acute angle with the first substrate. The asymmetric structure can deflect the light, ensuring that the light emitted by the backlight module meets the requirements.

[0008] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0009] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0010] Figure 1 This is a schematic diagram of a comparison display device provided in an embodiment of this application.

[0011] Figure 2 This is a schematic diagram of the diffuser plate of a contrast display device provided in an embodiment of this application, illustrating the diffusion of light.

[0012] Figure 3 This is a first schematic diagram of a backlight module provided in an embodiment of this application.

[0013] Figure 4 This is a second schematic diagram of a backlight module provided in an embodiment of this application.

[0014] Figure 5 This is a schematic diagram of a microlens provided in an embodiment of this application.

[0015] Figure 6 A schematic diagram of an optical component provided in an embodiment of this application.

[0016] Figure 7This is a third schematic diagram of a backlight module provided in an embodiment of this application.

[0017] Figure 8 This is a fourth schematic diagram of a backlight module provided in an embodiment of this application.

[0018] Figure 9 This is a schematic diagram of the lens layer provided in an embodiment of this application.

[0019] Figure 10 This is a schematic diagram of a first combination of a light source and a lens layer provided in an embodiment of this application.

[0020] Figure 11 This is a schematic diagram of a second combination of a light source and a lens layer provided in an embodiment of this application.

[0021] Explanation of reference numerals in the attached figures: 111. Backplane layer; 112. Driving substrate layer; 113. Light source layer; 114. Reflector layer; 115. Diffuser plate; 115a. Scattering particles; 116. Diffuser layer; 117. Brightness enhancement layer; 118. Reflective brightness enhancement layer.

[0022] 2. Backlight module; 21. Backplate; 22. Driving substrate; 23. Light source; 231. Light-emitting element; 24. Reflector; 25. Optical assembly; 251. Microlens; 251a. Microlens row; 251b. Microlens column; 252. First substrate; 253. Asymmetric structure; 254. Lens structure; 255. Second substrate; 256. Receiving groove; 26. Diffuser; 27. Brightness enhancement film; 28. Reflective brightness enhancement film; 29. ​​First ray; 31. Lens layer; 32. Central axis; 33. Optical film; X, First direction; Y, Second direction. Detailed Implementation

[0023] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0024] To illustrate the principle behind the technical problems in the embodiments of this application, some comparative display devices are provided for explanation. It should be understood that these comparative display devices are not considered prior art in the embodiments of this application. Figure 1As shown, the comparative display device includes a display panel and a backlight structure. The backlight structure includes a backplate layer 111, a driving substrate layer 112, a light source layer 113, a reflector layer 114, a diffuser plate 115, a diffuser layer 116, a brightness enhancement layer 117, and a dual brightness enhancement film (DBEF) 118. The reflector layer 114, diffuser plate 115, diffuser layer 116, brightness enhancement layer 117, and dual brightness enhancement film 118 are stacked sequentially in a direction perpendicular to the driving substrate layer 112 to improve the optical performance of the backlight module 2.

[0025] Specifically, the reflector layer 114 is used for optical partitioning to avoid color mixing, the diffuser plate 115 serves to support and homogenize light, improving optical uniformity, the diffuser layer 116 improves light uniformity, the brightening layer 117 enhances backlight brightness, and the reflective brightening layer 118 improves light transmittance. However, in actual use, it was found that light loss was significant when passing through the diffuser plate 115. Research revealed that this was due to the diffusion structure of the diffuser plate 115.

[0026] Specifically, such as Figure 2 As shown, the diffuser plate 115 contains diffuser particles. The diffuser plate 115 achieves uniform light by diffusing the light emitted from the light source layer 113 through the diffuser particles. However, the diffuser particles are randomly distributed in the diffuser plate 115, causing the light to deflect irregularly. A large amount of light is absorbed and lost during the scattering process, resulting in the transmittance of the diffuser plate 115 typically being less than 70%, leading to low light extraction efficiency of the backlight module 2. Therefore, existing liquid crystal display devices suffer from the technical problem of low light extraction efficiency of the backlight module 2.

[0027] This application provides a backlight module 2 and a display device to address the aforementioned technical problems.

[0028] like Figures 3 to 6 , Figures 8 to 11 As shown, this application embodiment provides a backlight module 2, which includes a light source 23, an optical component 25, and an optical film 33. The optical component 25 is disposed in the light emission direction of the light source 23, and the optical component 25 includes a plurality of microlenses 251. The optical film 33 is disposed on the side of the optical component 25 away from the light source 23; wherein the optical component 25 and the optical film 33 are in direct contact.

[0029] This application provides a backlight module 2, which is provided with an optical component 25 and the optical component 25 is in direct contact with an optical film 33. The multiple microlenses 251 in the optical component 25 can improve the transmittance and play a role in light uniformity, so that the optical component 25 can replace the diffuser plate 115 and improve the light output efficiency of the backlight module 2.

[0030] Specifically, compared to the use of a diffuser plate 115 for light uniformation in contrast display devices, in some embodiments of this application, an optical component 25 can be used instead of the diffuser plate 115. The microlens 251 in the optical component 25 can split the light emitted by the light source 23, thereby achieving light uniformation and enabling the backlight module 2 to work normally. The light loss is small when passing through the microlens 251, which can reduce light loss, improve the light output efficiency of the backlight module 2, and reduce the power consumption of the backlight module 2.

[0031] Specifically, direct contact between optical component 25 and optical film 33 means that no other components are provided between optical component 25 and optical film 33. There may be a certain gap between optical component 25 and optical film 33, or the relative surfaces of optical component 25 and optical film 33 may be in contact.

[0032] like Figure 3 , Figure 4 , Figure 6 As shown, this application embodiment provides a backlight module 2, which includes a light source 23, an optical component 25, and an optical film 33. The optical component 25 is disposed in the light emission direction of the light source 23. The optical component 25 includes a first substrate 252, a plurality of microlenses 251, and a plurality of asymmetric structures 253. The microlenses 251 and asymmetric structures 253 are disposed on both sides of the first substrate 252. The optical film 33 is disposed on the side of the optical component 25 away from the light source 23. The optical component 25 is in direct contact with the optical film 33.

[0033] This application provides a backlight module 2, which is equipped with an optical component 25 and has the optical component 25 in direct contact with an optical film 33. The multiple microlenses 251 in the optical component 25 can improve the transmittance and also play a role in light uniformity. This allows the optical component 25 to replace the diffuser plate 115, thereby improving the light emission efficiency of the backlight module 2. Furthermore, by setting an asymmetric structure 253, the light can be deflected through the asymmetric structure 253, so that the light emitted by the backlight module 2 meets the requirements.

[0034] like Figures 3 to 6As shown in the figure, this application embodiment provides a backlight module 2, which includes a light source 23, an optical component 25, and an optical film 33. The optical component 25 is disposed in the light emission direction of the light source 23. The optical component 25 includes a first substrate 252, a plurality of microlenses 251, and a plurality of asymmetric structures 253. The microlenses 251 and the asymmetric structures 253 are disposed on both sides of the first substrate 252. One side of the asymmetric structure 253 is perpendicular to the first substrate 252, and the other side of the asymmetric structure 253 forms an acute angle with the first substrate 252. The optical film 33 is disposed on the side of the optical component 25 away from the light source 23. The optical component 25 and the optical film 33 are in direct contact.

[0035] This application provides a backlight module 2. The backlight module 2 is equipped with an optical component 25, which is in direct contact with an optical film 33. Multiple microlenses 251 in the optical component 25 can improve transmittance and also play a role in light uniformity. This allows the optical component 25 to replace the diffuser plate 115, thereby improving the light emission efficiency of the backlight module 2. Furthermore, by setting an asymmetric structure 253, one side of the asymmetric structure 253 is perpendicular to the first substrate 252, and the other side of the asymmetric structure 253 forms an acute angle with the first substrate 252. The light can be deflected by the asymmetric structure 253, so that the light emitted by the backlight module 2 meets the requirements.

[0036] Specifically, acute angles can be greater than 0 and less than 90 degrees, such as 1 degree, 5 degrees, 10 degrees, 15 degrees, 20 degrees, 25 degrees, 30 degrees, 35 degrees, 40 degrees, 45 degrees, 50 degrees, 55 degrees, 60 degrees, 65 degrees, 70 degrees, 75 degrees, 80 degrees, 85 degrees, and 89 degrees.

[0037] In some embodiments, such as Figures 3 to 6 As shown, the optical component 25 may further include a first substrate 252, with the microlens 251 disposed on one side of the first substrate 252. By setting the first substrate 252 and placing the microlens 251 on one side of the first substrate 252, the first substrate 252 can serve as a support. Thus, the first substrate 252 and the microlens 251 replace the diffuser plate 115 to support the optical film 33 in the backlight module 2, and can perform light homogenization, enabling the backlight module 2 to work normally. Moreover, the light loss is small when passing through the microlens 251, which can reduce light loss, improve the light extraction efficiency of the backlight module 2, and reduce the power consumption of the backlight module 2.

[0038] Specifically, in contrast display devices, the diffuser plate 115 mainly serves as a support and light homogenizer, but its transmittance is low, often below 70%. In some embodiments of this application, an optical component 25 is provided in the backlight module 2. The optical component 25 includes a first substrate 252 and a microlens 251, allowing the optical component 25 formed by the combination of the first substrate 252 and the microlens 251 to provide support. Furthermore, the microlens 251 can homogenize the light emitted from the light source 23, thereby achieving the support and light homogenizing functions of the diffuser plate 115, thus replacing the diffuser plate 115. The microlens 251 also improves light transmittance, reducing light loss during the light diffusion process compared to using the diffuser plate 115, improving the light extraction efficiency of the backlight module 2, and reducing the power consumption of the backlight module 2.

[0039] Specifically, the first substrate 252 and the microlens 251 are integrally formed, that is, the microlens 251 can be formed by protrusion on the surface of the first substrate 252.

[0040] Specifically, the transmittance of the optical component 25 can be greater than or equal to 90%.

[0041] like Figures 7 to 11 As shown, this application embodiment provides a backlight module 2, which includes a light source 23, an optical component 25, and an optical film 33. The light source 23 includes a plurality of light-emitting elements 231. The optical component 25 is disposed in the light-emitting direction of the light source 23. The optical component 25 includes a lens layer 31. The optical film 33 is disposed on the side of the optical component 25 away from the light source 23. The lens layer 31 includes a plurality of lens structures 254, and the lens structures 254 are correspondingly disposed with respect to the light-emitting elements 231.

[0042] This application provides a backlight module 2, which includes an optical component 25, comprising a lens layer 31 and a plurality of lens structures 254. The lens structures 254 are correspondingly arranged with the light-emitting element 231, so that the lens structures 254 can converge the light emitted by the light-emitting element 231, thereby improving the light extraction efficiency. It can also shorten the distance between the light source 23 and the upper film layer, reduce light loss, and improve the light extraction efficiency of the backlight module 2.

[0043] Specifically, in contrast display devices, to prevent light loss caused by the light emitted from the light source 23 scattering to both sides, a reflector 24 is placed around the light source 23. The reflector 24 reflects the light, ensuring it exits in the forward direction. Furthermore, the reflector 24 optimizes the zoning effect and prevents color mixing. However, from... Figure 1As can be seen, in order to improve the reflection effect, the reflector 24 is often higher than the light source 23. In order to prevent damage to the reflector 24, there is a certain gap between the diffuser 115 and the reflector 24. This results in a large gap between the light source 23 and the diffuser 115, and some light loss occurs during the diffusion process, resulting in a low light output efficiency of the backlight module 2.

[0044] In some embodiments of this application, a lens layer 31 is provided so that the lens structure 254 is correspondingly set with the light-emitting element 231. The light is focused by the lens structure 254, which can optimize the zoning effect and make the light emitted by the light-emitting element 231 exit from the front, thereby acting as a reflector 24. The lens layer 31 can be directly set on the light source 23, so that the distance between the light source 23 and the lens layer 31 is small or even 0 or negative, reducing the loss in the light divergence process and improving the light output efficiency of the backlight module 2.

[0045] In some embodiments, such as Figure 7 As shown, the lens structure 254 protrudes toward the light source 23; by making the lens structure 254 protrude toward the light source 23, the lens structure 254 can converge the light, improve the light output efficiency, and the lens layer 31 can replace the diffuser plate 115, thereby improving the light output efficiency of the backlight module 2.

[0046] Specifically, when setting the lens layer 31, the lens structure 254 in the lens layer 31 can protrude towards the light-emitting layer. The lens structure 254 converges the light, so that the light emitted by the light-emitting element 231 is emitted in the front, reducing the light that diverges to both sides, thus acting as a reflector 24. The lens layer 31 can be directly set on the light source 23, so that the distance between the light source 23 and the lens layer 31 is small or even 0 or negative, reducing the loss during the light divergence process and improving the light extraction efficiency of the backlight module 2. Moreover, the side of the lens layer 31 away from the light source 23 can support the optical film 33, acting as a support for the diffuser plate 115, thus replacing the diffuser plate 115 and the reflector 24, reducing the thickness of the backlight module 2 and improving the light extraction efficiency of the backlight module 2.

[0047] In some embodiments, such as Figure 7As shown, the lens layer 31 may include a second substrate 255, which is disposed on the side of the lens structure 254 away from the light source 23. The optical film is in direct contact with the second substrate 255. Thus, the second substrate 255 can support the optical film 33, replacing the diffuser 115. The lens structure 254 can be raised to the reflector 24 to converge the light. Thus, by replacing the diffuser 115 and the reflector 24 with the lens layer 31, the light loss caused by the long path of the light emitted by the light source 23 during the divergence process and the loss caused by the diffuser 115 are reduced, thereby improving the light output efficiency of the backlight module 2.

[0048] Specifically, compared to the need for a reflector 24 and a diffuser 115 in a contrast display device, the reflector 24 results in a longer light divergence path, more reflections, and some light divergence and absorption, leading to light loss. Furthermore, the diffuser 115 has low transmittance, contributing to some light loss. In some embodiments of this application, a lens layer 31 is used instead of the diffuser 115 and reflector 24 to reduce light loss, improve the light extraction efficiency of the backlight module 2, and reduce the thickness of the backlight module 2.

[0049] Specifically, the second substrate 255 can be integrally formed with the lens structure 254, that is, the lens structure 254 is obtained by forming a protrusion on one side surface of the second substrate 255.

[0050] Specifically, the flatness of the side of the second substrate 255 away from the lens structure 254 can be greater than that of the side of the second substrate 255 close to the lens structure 254, so that the side of the second substrate 255 away from the lens structure 254 can contact the optical film 33 and support the optical film 33.

[0051] In some embodiments, a microlens 251 is provided on the side of the second substrate 255 away from the lens structure 254; thereby, the light can be uniformly distributed by the microlens 251, realizing the light uniformity function of the diffuser plate 115, and the second substrate 255 can support the optical film 33, realizing the support function of the diffuser plate 115. Thus, the second substrate 255 can replace the diffuser plate 115, and light loss can be reduced, improving the light output efficiency of the backlight module 2.

[0052] Specifically, in the comparison display device, the diffuser plate 115 mainly plays a supporting and light-uniforming role. In this embodiment, by providing a microlens 251 on the side of the second substrate 255 away from the lens structure 254, light can be uniformly calibrated by the microlens 251, and the second substrate 255 can support the optical film 33. Thus, the diffuser plate 115 is replaced by the lens layer 31, and the lens structure 254 is provided on the lens layer 31. The lens structure 254 can converge light and reduce light loss. Thus, the reflector 24 can be replaced by the lens layer 31, and the distance between the lens layer 31 and the light source 23 can be reduced, which can reduce the loss during the light divergence process. The microlens 251 in the lens layer 31 can uniformly calibrate light and reduce light loss, thereby improving the light output efficiency of the backlight module 2 and reducing power consumption.

[0053] In some embodiments, such as Figure 5 As shown, the optical component 25 further includes a first substrate 252, and the microlens 251 is disposed on one side of the first substrate 252. The plurality of microlenses 251 are arranged along a first direction X and a second direction Y to form a plurality of microlens rows 251a and a plurality of microlens columns 251b; wherein, at least two of the plurality of microlenses 251 in the microlens rows 251a are arranged in different ways; the angle between the first direction X and the second direction Y is greater than 0 and less than or equal to 90 degrees.

[0054] Specifically, by including a first substrate 252 in the optical component 25, and a microlens 251 disposed on one side of the first substrate 252, the first substrate 252 and the microlens 251 can play the role of support and light uniformity. The optical component 25 can replace the diffuser plate 115, and the light loss is less when passing through the microlens 251 and the first substrate, which can improve the light output efficiency of the backlight module 2.

[0055] Specifically, by arranging the microlenses 251 in at least two rows 251a in different ways, the microlenses 251 in different rows are arranged in a non-array manner, thereby avoiding the generation of moiré patterns and improving the display effect of the display device.

[0056] Specifically, the angle between the first direction X and the second direction Y can be an acute angle or a right angle, such as 89 degrees, 85 degrees, 80 degrees, 70 degrees, etc., which will not be elaborated here.

[0057] In some embodiments, the arrangement of the microlenses 251 in at least two microlens columns 251b is different, so that the microlenses 251 in different columns are arranged in a non-array manner, thereby avoiding the generation of moiré patterns and improving the display effect of the display device.

[0058] In some embodiments, the arrangement of multiple microlenses 251 in at least two rows 251a is different, and the arrangement of multiple microlenses 251 in at least two columns 251b is different; this allows the microlenses 251 in different rows to be arranged in a non-array manner, and the microlenses 251 in different columns to be arranged in a non-array manner, thereby avoiding the generation of moiré patterns and improving the display effect of the display device.

[0059] Specifically, when setting up the microlens 251, arranging the microlens 251 in an array may cause interference, resulting in moiré patterns when displayed. In this embodiment, the microlenses 251 are arranged in a non-array manner, which can avoid moiré patterns.

[0060] Specifically, when the arrangement of the microlenses 251 in at least two rows 251a is different, the number of microlenses 251 in different rows can be unequal, or the microlenses 251 in different rows can be staggered. Similarly, when the arrangement of the microlenses 251 in at least two columns 251b is different, the number of microlenses 251 in different columns can be unequal, or the microlenses 251 in different columns can be staggered.

[0061] Specifically, the above embodiment is illustrated by taking the arrangement of microlenses 251 along the first and second directions to form microlens rows 251a and microlens columns 251b as an example. However, the embodiments of this application are not limited to this. The microlenses 251 can be randomly distributed. There may be no obvious rows and columns of microlenses 251 in the first and second directions. For example, in the first and second directions, multiple microlenses 251 can be staggered, and the degree of misalignment of microlenses 251 at different positions is different, so that the microlenses 251 are randomly arranged, thereby avoiding the generation of moiré patterns.

[0062] Specifically, such as Figure 5 As shown, from Figure 5 As can be seen in (a), the first substrate 252 is provided with a plurality of microlenses 251, from which... Figure 5 As can be seen in (b), multiple microlenses 251 are randomly distributed on the first substrate 252, thereby avoiding the generation of moiré patterns.

[0063] Specifically, such as Figure 5 As shown in (c), the arrangement and number of microlenses 251 in different microlens rows 251a are different, and the relative positions of microlenses 251 in different microlens columns 251b are different, thereby avoiding the generation of moiré patterns.

[0064] In some embodiments, such as Figure 3 , Figure 4 , Figure 6 As shown, the optical component 25 further includes a first substrate 252 and a plurality of asymmetric structures 253. The microlens 251 is disposed on one side of the first substrate 252, and the asymmetric structures 253 are disposed on the side of the first substrate 252 away from the microlens 251. By including the first substrate 252 in the optical component 25, the first substrate 252 can support the optical film 33, thus playing a supporting role for the diffuser plate 115. The microlens 251 can play a role in uniform light distribution, thereby replacing the diffuser plate 115 and improving the light output efficiency of the backlight module 2. Furthermore, the asymmetric structures 253 can achieve angle deflection of light, enabling the backlight module 2 to be used in special scenarios.

[0065] Specifically, in some application scenarios, the brightness requirements for different angles of light are different. For example, in PHUD (Panoramic Head-Up Display) devices and privacy display devices, the backlight module 2 has different brightness requirements for different angles of light. Therefore, an asymmetric structure 253 can be set to deflect the light, so that the backlight module 2 can meet the needs of different display devices.

[0066] Specifically, when setting the asymmetric structure 253, the asymmetric structure 253 can deflect light to both sides or to the center area to meet the needs of different display devices. For example, if a display device requires light emission with a wide viewing angle, the asymmetric structure 253 can deflect the light to both sides to meet the needs of the display device.

[0067] Specifically, the first substrate 252, the asymmetric structure 253, and the microlens 251 can be integrally formed, that is, the asymmetric structure 253 and the microlens 251 are formed on the two surfaces of the first substrate 252 respectively.

[0068] In some embodiments, such as Figure 6 As shown, one side of the asymmetric structure 253 is perpendicular to the first substrate 252, and the other side of the asymmetric structure 253 forms an acute angle with the first substrate 252, so that the two sides of the asymmetric structure 253 are not symmetrical. The asymmetric structure 253 deflects the light, so that the angle of the light emitted by the backlight module 2 can meet the requirements.

[0069] Specifically, such as Figure 6 As shown, the cross-sectional shape of the asymmetric structure 253 is a right triangle. The two sides of the asymmetric structure 253 are not symmetrical with respect to the straight line in the second direction, which allows the asymmetric structure 253 to deflect light.

[0070] Specifically, the above embodiment is illustrated by taking the cross-sectional shape of the asymmetric structure 253 as a right triangle, but the embodiments of this application are not limited to this. For example, the cross-sectional shape of the asymmetric structure 253 can be an acute triangle, but the cross-sectional shape of the asymmetric structure 253 is not an isosceles triangle.

[0071] Specifically, such as Figure 6 As shown, it can be seen that the first ray 29 will be deflected at a certain angle after passing through the asymmetric structure 253 and the microlens 251.

[0072] In some embodiments, such as Figure 3 As shown, the microlens 251 is disposed between the light source 23 and the first substrate 252, and the asymmetric structure 253 is disposed between the optical film 33 and the first substrate 252. By disposing the microlens 251 between the light source 23 and the first substrate 252, and the asymmetric structure 253 between the optical film 33 and the first substrate 252, the light can be deflected by the asymmetric structure 253, directing the light to the middle region of the backlight module 2, thereby reducing light loss.

[0073] Specifically, some display devices require higher brightness for forward light emission, while having lower brightness or even no side light emission. In some embodiments of this application, a microlens 251 can be provided between the first substrate 252 and the light source 23 to uniformly emit light. An asymmetric structure 253 can be provided between the first substrate 252 and the optical film 33 to deflect the light to the middle area of ​​the backlight module 2, thereby increasing the brightness of forward light emission and reducing light loss caused by light diverging to both sides, thus improving the light emission efficiency of the backlight module 2.

[0074] For example, in a privacy display device, if the brightness of the side-emitting light is to be low or even non-existent in privacy mode, the backlight module 2 in the privacy display device can be equipped with an optical component 25, and the optical component 25 is equipped with an asymmetric structure 253. The asymmetric structure 253 is positioned between the optical film 33 and the first substrate 252 to deflect the light to the middle area of ​​the backlight module 2.

[0075] Specifically, when the asymmetric structure 253 is disposed between the optical film 33 and the first substrate 252, the structure of the asymmetric structure 253 can be designed to deflect the light to both sides, thereby improving the light emission angle of the display device.

[0076] In some embodiments, such as Figure 4As shown, the microlens 251 is disposed between the first substrate 252 and the optical film 33, and the asymmetric structure 253 is disposed between the light source 23 and the first substrate 252. By disposing the microlens 251 between the optical film 33 and the first substrate 252, and the asymmetric structure 253 between the light source 23 and the first substrate 252, the light can be deflected by the asymmetric structure 253 to both sides of the backlight module 2, achieving a larger deflection angle.

[0077] Specifically, some display devices need to have side-emitting light so that the display image can be seen from the side. In some embodiments of this application, a microlens 251 can be set between the first substrate 252 and the optical film 33 to uniform light. An asymmetric structure 253 can be set between the first substrate 252 and the light source 23 to deflect the light to both sides of the backlight module 2, thereby achieving a larger deflection angle.

[0078] For example, for some display devices used in head-up displays, the display screen needs to be visible even at a wide viewing angle, which requires high lateral brightness. In this case, the backlight module 2 in the privacy display device can be equipped with an optical component 25, which has an asymmetric structure 253. The asymmetric structure 253 is positioned between the light source 23 and the first substrate 252 to deflect the light to the two sides of the backlight module 2.

[0079] Specifically, when the asymmetric structure 253 is disposed between the light source 23 and the first substrate 252, the structure of the asymmetric structure 253 can be designed to deflect the light towards the middle area, thereby increasing the brightness of the forward light emitted by the display device, reducing brightness loss, and improving the light emission efficiency.

[0080] Specifically, the diameter of the microlens 251 ranges from 5 micrometers to 50 micrometers, resulting in a high density of microlenses 251. Even if the microlens 251 is directly connected to the optical film 33, the microlens 251 will not be damaged. Furthermore, the microlens 251 can split light to achieve uniform light distribution, reduce light loss, and improve the light output efficiency of the backlight module 2.

[0081] Specifically, the microlens 251 can be a convex lens; the convex lens splits the light to achieve uniform light, and the microlens 251 achieves the uniform light function of the diffuser plate 115, and can reduce light loss and improve the light output efficiency of the backlight module 2.

[0082] Specifically, the microlens 251 can be disposed in the area above the light-emitting element 231, and can also be disposed in the area between the light-emitting elements 231.

[0083] Specifically, the asymmetric structure 253 can achieve a deflection angle from -20 degrees to 20 degrees. Taking right as positive and left as negative, it can achieve a deflection of 20 degrees to the left and 20 degrees to the right.

[0084] In some embodiments, such as Figure 3 , Figure 4 As shown, the backlight module 2 also includes a reflector 24, which is disposed around the light source 23, and the optical component 25 is disposed between the reflector 24 and the optical film 33. By setting the reflector 24, the light emitted by the light source 23 can be converged in all directions, reducing light loss, and the light-emitting element 231 can be separated by the reflector 24 to avoid color mixing.

[0085] In some embodiments, such as Figure 7 As shown, the light source 23 includes multiple light-emitting elements 231, and the optical assembly 25 further includes a lens layer 31. The lens layer 31 includes multiple lens structures 254, which are correspondingly arranged with the light-emitting elements 231 and protrude towards the light source 23. By including a lens layer 31 in the optical assembly 25, with multiple lens structures 254 correspondingly arranged with the light-emitting elements 231 and protruding towards the light source 23, the light emitted by the light-emitting elements 231 can be focused through the lens structures 254, improving the light extraction efficiency. Furthermore, the distance between the light source 23 and the upper film layer can be shortened, reducing light loss and improving the light extraction efficiency of the backlight module 2.

[0086] Specifically, in contrast display devices, to prevent light loss caused by the light emitted from the light source 23 scattering to both sides, a reflector 24 is placed around the light source 23. The reflector 24 reflects the light, ensuring it exits in the forward direction. Furthermore, the reflector 24 optimizes the zoning effect and prevents color mixing. However, from... Figure 1 As can be seen, in order to improve the reflection effect, the reflector 24 is often higher than the light source 23. In order to prevent damage to the reflector 24, there is a certain gap between the diffuser 115 and the reflector 24. This results in a large gap between the light source 23 and the diffuser 115, and some light loss occurs during the diffusion process, resulting in a low light output efficiency of the backlight module 2.

[0087] In some embodiments of this application, the optical component 25 includes a lens layer 31, and the lens structure 254 is correspondingly arranged with the light-emitting element 231. The lens structure 254 converges the light, which can optimize the zoning effect and make the light emitted by the light-emitting element 231 exit from the front, thereby acting as a reflector 24. The lens layer 31 can be directly arranged on the light source 23, so that the distance between the light source 23 and the lens layer 31 is small or even 0 or negative, reducing the loss in the light divergence process and improving the light output efficiency of the backlight module 2.

[0088] Specifically, when the lens structure 254 protrudes toward the light-emitting element 231, the flatness of the surface of the lens structure 254 on the side away from the light source 23 can be relatively high, so that the optical film 33 can directly contact the lens structure 254, thereby using the lens layer 31 to replace the reflector 24 and the diffuser 115, reducing light loss and improving the light output efficiency of the backlight module 2.

[0089] Specifically, compared to when the lens structure 254 protrudes towards the optical film 33, due to the larger volume of the lens structure 254, the optical film 33 cannot be directly placed on top of the lens structure 254. The lens layer 31 can only replace the reflector 24 and cannot replace the diffuser 115. By making the lens structure 254 protrude towards the light source 23, the side of the lens structure 254 near the optical film 33 is relatively flat and can directly contact the optical film 33. Thus, the lens layer 31 can replace the reflector 24 and the diffuser 115, reducing light loss and improving the light output efficiency of the backlight module 2.

[0090] Specifically, the backlight module 2 can include a lens layer 31, and the lens layer 31 and the optical component 25 can be set independently.

[0091] In some embodiments, such as Figures 8 to 11 As shown, the light source 23 includes multiple light-emitting elements 231, and the optical assembly 25 further includes a lens layer 31. The lens layer 31 includes multiple lens structures 254, which are correspondingly arranged with the light-emitting elements 231 and protrude towards the optical film 33. By including a lens layer 31 in the optical assembly 25, with multiple lens structures 254 correspondingly arranged with the light-emitting elements 231 and protruding towards the optical film 33, the light emitted by the light-emitting elements 231 can be focused through the lens structures 254, improving the light extraction efficiency. Furthermore, the distance between the light source 23 and the upper film layer can be shortened, reducing light loss and improving the light extraction efficiency of the backlight module 2.

[0092] Specifically, compared to the case where a reflector 24 is set in a contrast display device, there is a gap between the light source 23 and the upper film layer, resulting in some light loss. In this embodiment, a lens structure 254 is set to focus the light. The lens structure 254 can be in direct contact with the light source 23 or the gap is small, which shortens the gap between the light source 23 and the upper film layer, reduces light loss, and improves the light output efficiency of the backlight module 2.

[0093] Specifically, when the lens structure 254 protrudes toward the optical film 33, a diffuser plate can be provided on the lens structure 254. However, the embodiments of this application are not limited to this, such as... Figure 8 As shown, a first substrate 252 and a microlens 251 can be disposed on the lens structure 254.

[0094] Specifically, the optical component 25 may include a microlens 251 and a first substrate 252, or the optical component 25 may include a microlens 251, a first substrate 252 and an asymmetric structure 253; or the optical component 25 may include a lens layer 31, the lens layer 31 including a lens structure 254 and a second substrate 255; or the optical component 25 may include a microlens 251, a first substrate 252 and a lens layer 31; or the optical component 25 may include a microlens 251, a first substrate 252, an asymmetric structure 253 and a lens layer 31; these will not be elaborated further here.

[0095] In some embodiments, such as Figure 8 As shown, the lens layer 31 further includes a second substrate 255, which is disposed between the lens structure 254 and the light source 23. The light-emitting element 231 is in direct contact with the second substrate 255. By making the light-emitting element 231 in direct contact with the second substrate 255, there is no gap between the light-emitting element 231 and the upper film layer, allowing light to directly enter the upper film layer, avoiding light loss and improving the light extraction efficiency of the backlight module 2.

[0096] Specifically, the distance L between the light-emitting element 231 and the second substrate 255 can be less than or equal to 1 mm, so that there is a reduced distance between the light-emitting element 231 and the second substrate 255, avoiding damage to the light-emitting element 231 by the second substrate 255. Moreover, the smaller distance between the light-emitting element 231 and the second substrate 255 results in less light loss and improves the light output efficiency of the backlight module 2.

[0097] In some embodiments, such as Figures 9 to 10As shown, the lens layer 31 also includes a second substrate 255, which is disposed between the lens structure 254 and the light source 23. A receiving groove 256 is provided on the side of the second substrate 255 closest to the light source 23, and the light-emitting element 231 is disposed within the receiving groove 256. By providing a receiving groove 256 on the side of the second substrate 255 closest to the light source 23, and placing the light-emitting element 231 within the receiving groove 256, the distance between the light source 23 and the upper film layer is negative (0 distance is defined as the bottom surface of the second substrate 255 directly contacting the light source 23, i.e., the light source 23 is located above the bottom surface of the second substrate 255, and the distance between the light source 23 and the second substrate 255 can be considered negative), thereby further reducing light loss and improving the light extraction efficiency of the backlight module 2.

[0098] Specifically, such as Figure 10 As shown, a portion of the light source 23 can be placed within the receiving groove 256, or the entire light source 23 can be placed within the receiving groove 256.

[0099] Specifically, such as Figure 9 As shown, when the second substrate 255 includes the receiving groove 256, the light mixing effect can be achieved by combining the lens structure 254 and the surface of the second substrate 255 with the receiving groove 256 with the light source 23 to form a light mixing structure based on the designed light mixing effect.

[0100] Specifically, the lens structure 254 can be injection molded from a transparent polymer material, and light control can be achieved by utilizing the refractive index of light as it travels from one medium to another.

[0101] Specifically, the light-emitting element 231 can be configured to correspond one-to-one with the lens structure 254.

[0102] In some embodiments, such as Figure 11 As shown, the lens structure 254 is asymmetrically arranged on both sides of the central axis of the light-emitting element 231; thereby deflecting the light so that the light emitted by the backlight module 2 can meet different needs.

[0103] Specifically, some display devices require higher brightness for front-emitting light and lower brightness or even no side-emitting light. In some embodiments of this application, the lens structure 254 can be asymmetrically arranged on both sides of the central axis of the light-emitting element 231. The lens structure 254 deflects the light to the middle area of ​​the backlight module 2, thereby increasing the brightness of front-emitting light and reducing light loss caused by light diverging to both sides, thus improving the light emission efficiency of the backlight module 2.

[0104] Specifically, some display devices need to have side-emitting light so that the display image can be seen from the side. In some embodiments of this application, the lens structure 254 can be asymmetrically arranged on both sides of the central axis of the light-emitting element 231 to deflect the light to the two sides of the backlight module 2, thereby achieving a larger deflection angle.

[0105] Specifically, the lens structure 254 can be set asymmetrically about the center line of the lens structure 254, with the center line passing through the midpoint of the bottom of the lens structure 254.

[0106] Specifically, the diameter of the lens structure 254 can be larger than the diameter of the microlens 251. This allows the lens structure 254 to converge the light emitted from the light source 23 and divide the light source 23 into sections, while the microlens 251 disperses the light, thus achieving a uniform light distribution. Through the different functions of the microlens 251 and the lens structure 254, the diffuser 115 and the reflector 24 are replaced, and the light transmittance in the microlens 251 and the lens structure 254 is relatively high, thereby improving the light output efficiency of the backlight module 2.

[0107] Specifically, the light source 23 may also include an encapsulation layer, which may be disposed on the light-emitting element 231.

[0108] Specifically, the backlight module 2 also includes a driving substrate 22, which is disposed on the side of the light source 23 away from the optical component 25. The driving substrate 22 may include a substrate and a circuit structure disposed on the substrate. The driving substrate 22 is electrically connected to the light source 23 and is used to drive the light source 23 to emit light.

[0109] Specifically, the backlight module 2 also includes a back plate 21, which is disposed on the side of the driving substrate 22 away from the light source 23.

[0110] Specifically, the material of the optical components includes polycarbonate, and one or more of the following materials can be polycarbonate: the first substrate 252, the microlens 251, the asymmetric structure 253, the lens structure 254, and the second substrate 255.

[0111] Specifically, multiple light-emitting elements 231 can be arranged in an array on the driving substrate 22. The light-emitting elements 231 can be at least one of light-emitting diodes (LEDs), mini light-emitting diodes (Mini LEDs), or micro light-emitting diodes (Micro LEDs), but are not limited thereto.

[0112] In some embodiments, the light-emitting element 231 may include a light-emitting diode chip, which may be one or more of blue light-emitting diode chips, green light-emitting diode chips, and red light-emitting diode chips. When the light-emitting diode chip is a light-emitting diode chip of one or two colors, a color conversion film may be provided in the optical film 33 to achieve full-color display.

[0113] In some embodiments, the light-emitting element 231 can also be a white light-emitting diode chip, and a color conversion film can be provided in the optical film 33 to achieve full-color display.

[0114] In some embodiments, the light-emitting element 231 may also be one or more of the following: blue light-emitting diode chip, green light-emitting diode chip, red light-emitting diode chip, and white light-emitting diode chip.

[0115] In some embodiments, the light-emitting element 231 may include a light-emitting diode chip and a color conversion film located on the light-emitting side of the light-emitting diode chip; wherein, the light-emitting diode chip may be a blue light-emitting diode, and the color conversion film converts the blue light emitted by the blue light-emitting diode into red light and green light, which are then mixed with the blue light to form white light.

[0116] In some embodiments, the light-emitting material of the light-emitting diode chip may include materials such as gallium nitride (GaN), aluminum gallium nitride (AlGaN), and indium gallium nitride (InGaN); the material of the color conversion film includes phosphor materials, such as yttrium aluminum garnet (YAG), fluoride (KSF), or quantum dot (QD).

[0117] Specifically, the optical film 33 includes a diffuser 26, a brightness enhancement film 27, and a reflective brightness enhancement film 28; the diffuser 26 is disposed between the optical component 25 and the brightness enhancement film 27, and the brightness enhancement film 27 is disposed between the diffuser 26 and the reflective brightness enhancement film 28. The diffuser 26 can improve light uniformity, the brightness enhancement film 27 can improve backlight brightness, and the reflective brightness enhancement film 28 can improve the transmittance of the backlight module 2. However, the embodiments of this application are not limited to this; the optical film 33 can be one or more of the above-mentioned film layers, or the optical film 33 may also include other film layers.

[0118] Specifically, in some embodiments of this application, the optical component 25 and the optical film 33 are directly in contact as an example for illustration. However, the embodiments of this application are not limited to this. Considering the bonding gap or to prevent scratching the film, there may be a certain gap between the optical component 25 and the optical film 33. In this case, the optical component 25 and the optical film 33 can be arranged adjacent to each other, which can also achieve the function of replacing the diffuser plate 115.

[0119] Specifically, the above embodiments have provided a detailed description of the backlight module 2 from aspects such as the film layer structure and the specific structure of each component. It is understood that when there is no conflict between the various embodiments, the features of each embodiment and / or the various embodiments can be combined. For example, in some embodiments, the lens layer 31 further includes a second substrate 255, which is disposed between the lens structure 254 and the light source 23, and the distance between the light-emitting element 231 and the second substrate 255 is less than or equal to 1 mm; or, in some embodiments, the lens layer 31 further includes a second substrate 255, which is disposed between the lens structure 254 and the light source 23, and the second substrate 255 has a receiving groove 256 on the side near the light source 23, and the light-emitting element 231 is disposed in the receiving groove 256, and the portion of the lens structure 254 located on both sides of the central axis of the light-emitting element 231 is asymmetrically arranged.

[0120] Meanwhile, this application provides a display device, which includes a backlight module 2 as described in any of the above embodiments.

[0121] Specifically, the display device may also include a liquid crystal display panel, which is disposed on the light-emitting side of the backlight module.

[0122] In some embodiments, the liquid crystal display panel includes a first substrate, a second substrate, a liquid crystal layer, a first polarizer and a second polarizer. The first substrate and the second substrate are joined together to form a liquid crystal cell. The liquid crystal layer is disposed inside the liquid crystal cell. The second substrate is disposed on the side of the first substrate away from the backlight module 2. The first polarizer is disposed between the first substrate and the backlight module 2. The second polarizer is disposed on the side of the second substrate away from the first substrate.

[0123] Specifically, the first substrate can be an array substrate, and the second substrate can be a color filter substrate. The array substrate can include a thin-film transistor array layer, and the color filter substrate can include a color resist layer.

[0124] Specifically, the first substrate can also be a COA (Color On Array) substrate, and the second substrate is the opposite substrate of the first substrate. A black matrix layer can be disposed on the second substrate.

[0125] Specifically, the display device can be used in vehicle displays, computers, laptops, and mobile phones, but the embodiments of this application are not limited to these.

[0126] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0127] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0128] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0129] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A backlight module, characterized in that, include: light source; An optical component is disposed in the light emission direction of the light source. The optical component includes a first substrate, a plurality of microlenses and a plurality of asymmetric structures. The microlenses and the asymmetric structures are disposed on both sides of the first substrate. One side of the asymmetric structure is perpendicular to the first substrate, and the other side of the asymmetric structure forms an acute angle with the first substrate. An optical film is disposed on the side of the optical component away from the light source; The optical component is in direct contact with the optical film.

2. The backlight module according to claim 1, characterized in that, The plurality of microlenses are arranged along a first direction and a second direction to form a plurality of microlens rows and a plurality of microlens columns; Wherein, the arrangement of multiple microlenses in at least two rows of microlenses is different; and / or, the arrangement of multiple microlenses in at least two columns of microlenses is different; and the angle between the first direction and the second direction is greater than 0 and less than or equal to 90 degrees.

3. The backlight module according to claim 1, characterized in that, The microlens is disposed between the light source and the first substrate, and the asymmetric structure is disposed between the optical film and the first substrate.

4. The backlight module according to claim 1, characterized in that, The microlens is disposed between the first substrate and the optical film, and the asymmetric structure is disposed between the light source and the first substrate.

5. The backlight module according to any one of claims 1 to 4, characterized in that, The light source includes multiple light-emitting elements, and the optical assembly further includes a lens layer. The lens layer includes multiple lens structures, which are arranged corresponding to the light-emitting elements and protrude toward the light source.

6. The backlight module according to any one of claims 1 to 4, characterized in that, The light source includes multiple light-emitting elements, and the optical assembly further includes a lens layer. The lens layer includes multiple lens structures, which are arranged corresponding to the light-emitting elements and protrude toward the optical film.

7. The backlight module according to claim 6, characterized in that, The lens layer further includes a second substrate, which is disposed between the lens structure and the light source, and the light-emitting element is in direct contact with the second substrate.

8. The backlight module according to claim 6, characterized in that, The lens layer further includes a second substrate, which is disposed between the lens structure and the light source. The second substrate has a receiving groove on the side near the light source, and the light-emitting element is disposed in the receiving groove.

9. The backlight module according to claim 6, characterized in that, The lens structure is asymmetrically arranged on both sides of the central axis of the light-emitting element.

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

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