Backlight optical module and display equipment
By using a combination of multiple light source components and a diffuse reflection base plate in the backlight module, the problems of large size of direct-lit backlight modules and poor light spot uniformity of side-lit backlight modules are solved, achieving uniform illumination and efficient energy utilization in a limited space.
Patent Information
- Application Number
- CN202423218312.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-23
- Publication Date
- 2025-11-28
- Estimated Expiration
- 2034-12-23
AI Technical Summary
Existing direct-lit backlight modules are large and expensive, while edge-lit backlight modules have poor light spot uniformity, making it difficult to achieve uniform illumination in a limited space.
The system employs a combination of multiple light source components and a diffuse reflection base plate. The light source components are arranged circumferentially on the side of the reflection ring closest to the diffuse reflection base plate, which is used to diffusely reflect the illumination beam to form a uniform light spot.
It achieves uniform illumination in a smaller space, shortens the distance between the light source and the illuminated object, improves the uniformity of the light spot and the energy utilization rate, and reduces the size of the backlight optical module.
Smart Images
Figure CN223612038U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to optical technology field especially relates to a backlight optical module and display equipment. BACKGROUND
[0002] General backlight module has direct type backlight module and side -type backlight module. Direct type backlight module exists thickness size big, light source quantity is many, the price is slightly expensive, the volume is big shortcoming, this makes in product design often needs to reserve a lot of space to place direct type backlight module, otherwise product is easy to appear dark spot. And side -type backlight module although has reduced in thickness, but because side -type backlight module generally only emits light in module one side, utilizes the light of well -designed light guide plate to deliver to entire plane, in this process due to energy loss, often appear near the light source one side brightness is high, far away from the light source one side brightness is low, lead to poor light spot uniformity. SUMMARY
[0003] The utility model discloses an embodiment of backlight optical module and display equipment, has realized the backlight illumination of higher uniformity.
[0004] According to one aspect of the utility model, an embodiment of the utility model provides a kind of backlight optical module, including light source component, reflecting ring and diffuse reflection bottom plate, light source component includes multiple light sources, multiple light sources are located reflecting ring close to diffuse reflection bottom plate one side and along the arrangement of circumference;
[0005] Light source component is used to emit illumination beam;
[0006] Diffuse reflection bottom plate is used for diffuse reflection illumination beam, and illumination beam forms uniform light spot.
[0007] Optionally, multiple light sources are located in the same plane, and the plane where multiple light sources are located is parallel to the diffuse reflection bottom plate.
[0008] Multiple light sources are arranged along the circumference equicentral angle in reflecting ring.
[0009] Optionally, light source component includes 12 light sources.
[0010] Optionally, reflecting ring is concentric circular ring, and the plane where concentric circular ring is located is parallel to the diffuse reflection bottom plate.
[0011] The inner diameter of reflecting ring is R1, the outer diameter of reflecting ring is R2, and the radius of the circumference where multiple light sources are located is R3, and R1
[0012] Optionally, the range of outer diameter R2 is 15mm to 80mm.
[0013] Optionally, the included angle between the normal plane of the chief ray of the light source and the plane where the diffuse reflection bottom plate is located is α, wherein 80°≤α≤85°.
[0014] Optionally, the diffuse reflection bottom plate comprises a first bottom plate surface close to one side of the reflection ring, and the first bottom plate surface comprises a plurality of convex substructures and a plurality of concave substructures.
[0015] Optionally, the thickness of the backlight optical module is D, wherein D≤2.5mm.
[0016] According to another aspect of the present application, the present application provides a display device comprising a pattern structure and at least one backlight optical module according to any one of the embodiments of the present application;
[0017] The pattern structure is located on the light emitting direction of the backlight optical module.
[0018] Optionally, the distance between the pattern structure and the backlight optical module is L, wherein L≤5mm.
[0019] The backlight optical module provided by the present application has the advantages that the diffuse reflection bottom plate is arranged to reflect the illumination light beam to the illuminated object after the illumination light beam propagates to the diffuse reflection bottom plate, the optical path of the illumination light beam is folded, the illumination light beam obtains a longer propagation distance in a smaller space, the spot of the illumination light beam is enlarged to a sufficient size to completely illuminate the illuminated object during the propagation process, the distance from the light source to the illuminated object is shortened, and the size of the backlight optical module is reduced; meanwhile, the diffuse reflection bottom plate can scatter the illumination light beam, and the distribution of the illumination light beam in the space is more uniform.
[0020] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, and is not used to limit the scope of the present application. Other features of the present application will become apparent through the following description. BRIEF DESCRIPTION OF DRAWINGS
[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without creative labor.
[0022] Figure 1 is a perspective view of a backlight optical module provided by the present application;
[0023] Figure 2 is a side view of an optical module provided by the present application;
[0024] Figure 3 is a light path schematic view of a backlight module provided by the present application;
[0025] Figure 4 is a perspective view of an illuminated object and a backlight optical module provided by an embodiment of the present application;
[0026] Figure 5 is a side view of an illuminated object and a backlight optical module provided by an embodiment of the present application;
[0027] Figure 6 is a distribution diagram of a light source assembly on a reflecting ring provided by an embodiment of the present application;
[0028] Figure 7 is a two-dimensional output light intensity distribution diagram of a backlight optical module provided by an embodiment of the present application;
[0029] Figure 8 is a distribution diagram of output light intensity in a first direction of a backlight optical module provided by an embodiment of the present application;
[0030] Figure 9 is a distribution diagram of output light intensity in a second direction of a backlight optical module provided by an embodiment of the present application;
[0031] Figure 10 is a structural schematic diagram of a display device provided by an embodiment of the present application. DETAILED DESCRIPTION
[0032] In order to make the person skilled in the art better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by the person skilled in the art without creative labor should belong to the protection scope of the present application.
[0033] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0034] In the prior art, the direct backlight module needs to leave a larger distance to make the spot of the illumination beam emitted by the light source expand, so that the illumination beam can uniformly illuminate the illuminated object, thereby causing the direct backlight module to have a large volume. The edge-lit backlight module is provided with a light source only on one side, so that the illumination beam of the edge-lit backlight module is difficult to propagate from one side to the entire backlight module, and therefore the illumination uniformity of the edge-lit backlight module is poor.
[0035] To solve the problems of the backlight module illumination uniformity and large volume, the backlight optical module provided in the embodiments of the present application, Figure 1 is a perspective view of the backlight optical module provided in the embodiments of the present application, Figure 2 is a side view of the optical module provided in the embodiments of the present application, in combination with Figure 1 and Figure 2 , the backlight optical module comprises a light source assembly 100, a reflecting ring 200 and a diffuse reflection bottom plate 300, the light source assembly 100 comprises a plurality of light sources 101, the plurality of light sources 101 are located on the side of the reflecting ring 200 close to the diffuse reflection bottom plate 300 and are arranged in a circumferential direction; the light source assembly 100 is used for emitting an illumination beam; the diffuse reflection bottom plate 300 is used for diffusely reflecting the illumination beam, so that the illumination beam forms a uniform spot.
[0036] Figure 3 is a light path schematic view of the backlight module provided in the embodiments of the present application, in combination with Figure 1 , Figure 2 and Figure 3 , the reflecting ring 200 can be a circular ring plane, and the light source 101 is arranged between the reflecting ring 200 and the diffuse reflection bottom plate 300. Part of the illumination beam emitted by the light source 101 is incident on the diffuse reflection bottom plate 300, the illumination beam is diffusely reflected on the surface of the diffuse reflection bottom plate 300, thereby changing the propagation direction, propagating away from the diffuse reflection bottom plate 300, and finally output from the circular opening in the center of the reflecting ring 200, and illuminating the illuminated object 400. In addition, a small part of the illumination beam is incident on the reflecting ring 200, the illumination beam incident on the reflecting ring 200 is reflected by the reflecting ring 200, thereby changing the propagation direction, propagating to the diffuse reflection bottom plate 300, and then being diffusely reflected by the diffuse reflection bottom plate 300, and finally illuminating the illuminated object 400. Figure 4 is a perspective view of the illuminated object and the backlight optical module provided in the embodiments of the present application, Figure 5 is a side view of the illuminated object and the backlight optical module provided in the embodiments of the present application, in combination with Figure 4 and Figure 5The illuminated object 400 is arranged on the side of the reflecting ring 200 away from the diffuse reflection bottom plate 300 and is away from the reflecting ring 200, and because the illumination light beams are diffused on the surface of the diffuse reflection bottom plate 300, the distribution of the illumination light beams in the space becomes more uniform, so that the illumination light beams can uniformly illuminate the illuminated object 400.
[0037] The backlight optical module provided by the embodiment of the utility model, through setting the diffuse reflection bottom plate, makes the illumination light beams be reflected on the illuminated object after propagating to the diffuse reflection bottom plate, folds the light path of the illumination light beams, makes the illumination light beams obtain the longer propagation distance in the smaller space, makes the light spot of the illumination light beams expand enough to illuminate the illuminated object completely in the propagation process, thereby shortens the distance from the light source to the illuminated object, reduces the size of the backlight optical module; the diffuse reflection bottom plate can scatter the illumination light beams, makes the distribution of the illumination light beams in the space more uniform.
[0038] Optionally, the light source 101 comprises an LED lamp bead.
[0039] Optionally, the plurality of light sources 101 are located in the same plane, and the plane where the plurality of light sources 101 are located is parallel to the diffuse reflection bottom plate 300; the plurality of light sources 101 are arranged in equal central angles along the circumference of the reflecting ring 200. The distance between each light source 101 and the diffuse reflection bottom plate 300 is equal, and each light source 101 is arranged in equal central angles on the reflecting ring 200, so that the distribution of the illumination light beams emitted by each light source 101 on the diffuse reflection bottom plate 300 is more uniform, avoiding the case that the illumination light beams irradiated on the diffuse reflection bottom plate 300 have a large difference in intensity distribution, so that the distribution of the illumination light beams irradiated on the illuminated object 400 is more uniform.
[0040] Optionally, Figure 6 is a distribution diagram of a light source assembly on a reflecting ring provided by the embodiment of the utility model, referring to Figure 6 , the light source assembly 100 comprises 12 light sources 101, and the 12 light sources 101 are arranged in equal central angles on the reflecting ring 200. The 12 light sources 101 ensure that the illumination light beams are large enough, avoiding the case that the part of the diffuse reflection bottom plate 300 far away from the light source 101 receives less illumination light beams, so as to solve the problem that the distribution of the illumination light beams diffused to the illuminated object 400 is uneven.
[0041] Optionally, the reflecting ring 200 is a concentric circular ring, the plane where the concentric circular ring is located is parallel to the diffuse reflection bottom plate 300; the inner diameter of the reflecting ring 200 is R1, the outer diameter of the reflecting ring 200 is R2, and the radius of the circumference where the plurality of light sources 101 are located is R3, and R1 < R3 < R2.
[0042] Referring to Figure 6The plurality of light sources 101 are arranged in a circumferential direction on the reflecting ring 200, and thus the light sources 101 are located on the same circle with a radius R3. When R1 < R3 < R2, the illumination light beams propagating away from the diffuse reflection bottom plate 300 can be incident on the reflecting ring 200, reflected by the reflecting ring 200, and then incident on the diffuse reflection bottom plate 300, thereby avoiding the illumination light beams directly irradiating on the object 400, and increasing the illumination uniformity and energy utilization of the backlight optical module.
[0043] Optionally, the outer diameter R2 is in a range of 15mm to 80mm. The size of the reflecting ring 200 depends on the number of the light sources 101 and the size of the object 400, and the outer diameter R2 of the reflecting ring 200 is usually between 15mm and 80mm.
[0044] With reference to Figure 3 Optionally, an included angle between a normal plane P1 of the chief ray S1 of the light source 101 and a plane where the diffuse reflection bottom plate 300 is located is α, and 80° ≤ α ≤ 85°. According to simulation results, when 80° ≤ α ≤ 85°, most of the illumination light beams emitted by the light source 101 can be incident on the diffuse reflection bottom plate 300, while the illumination light beams can be prevented from being emitted out of the backlight optical module from the gap between the reflecting ring 200 and the diffuse reflection bottom plate 300, and the uniformity of the light spot irradiated on the object 400 is good. In addition, when the illumination light beams emitted by the light source 101 form a large angle with the diffuse reflection bottom plate 300, the distance of the illumination light beams propagating from the light source 101 to the diffuse reflection bottom plate 300 is long, and the light spot of the illumination light beams gradually expands in the propagation process, so the longer the propagation distance of the illumination light beams, the better the uniformity of the illumination light beams.
[0045] Optionally, α = 82.35°, and the uniformity of the illumination light beams obtained at this angle is good.
[0046] Figure 7 is a two-dimensional output light intensity distribution diagram of the backlight optical module provided by the embodiment of the present application, Figure 8 is a distribution diagram of output light intensity in a first direction of the backlight optical module provided by the embodiment of the present application, Figure 9 is a distribution diagram of output light intensity in a second direction of the backlight optical module provided by the embodiment of the present application, Figure 7 、 Figure 8 and Figure 9 are simulation results of software, and in combination with Figure 7 、 Figure 8 and Figure 9 , it is shown that the first direction X and the second direction Y are perpendicular to each other. Figure 8 In the diagram, the horizontal coordinate is the position of the light spot in the first direction X, and the vertical coordinate is the light intensity, Figure 9The horizontal coordinate is the position of the light spot in the second direction Y, and the vertical coordinate is the light intensity. According to the simulation result, the diameter of the light spot finally output by the backlight optical module is 30 mm, and the edge of the light spot is steep and the brightness is uniform.
[0047] Optionally, the diffuse reflection bottom plate comprises a first bottom plate surface close to one side of the reflection ring, and the first bottom plate surface comprises a plurality of convex substructures and a plurality of concave substructures. The plurality of convex substructures and the plurality of concave substructures can scatter the illumination light beams incident on the diffuse reflection bottom plate 300 in all directions, thereby increasing the uniformity of the distribution of the illumination light beams.
[0048] Optionally, Figure 10 is a structural schematic diagram of a display device provided by the embodiment of the present application, referring to Figure 10 The thickness of the backlight optical module is D, wherein D≤2.5 mm. The thickness D of the backlight optical module is less than or equal to 2.5 mm.
[0049] Specifically, since the illumination light beams need to propagate for a certain distance to expand the light spot to a size sufficient to cover the entire illuminated object 400, the thickness of the backlight optical module in the prior art is difficult to reduce. However, the backlight optical module provided by the embodiment of the present application uses a diffuse reflection plate to diffuse the illumination light beams. On the one hand, the illumination light beams propagate from the light source 101 to the diffuse reflection bottom plate 300 and then are reflected from the diffuse reflection bottom plate 300 to the illuminated object 400, which is equivalent to the illumination light beams going back and forth in the space between the light source 101 and the diffuse reflection bottom plate 400. Therefore, this part of the space provides the illumination light beams with a propagation distance twice their own length, and the illumination light beams expand the light spot to a size sufficient to illuminate the entire illuminated object 400 in the process of propagating in the space between the light source 101 and the diffuse reflection bottom plate 400. On the other hand, the diffuse reflection bottom plate 300 can diffuse the illumination light beams, so that the illumination light beams are scattered in all directions on the surface of the diffuse reflection bottom plate 300, and the original light spot is scattered by the diffuse reflection bottom plate 300, thereby expanding the size of the light spot and avoiding the problem that the illumination light beams cannot illuminate part of the illuminated object 400. By arranging the diffuse reflection bottom plate 300, the backlight optical module provided by the embodiment of the present application can ensure uniform distribution of the illumination light beams on the illuminated object 400 while further reducing the thickness D, and the thickness D can be less than or equal to 2.5 mm, so that the backlight optical module has a smaller volume and can be installed in a relatively narrow space, making the backlight optical module more flexible to set and suitable for more application scenarios.
[0050] For example, the thickness D of the backlight optical module can be 0.8 mm, 1.2 mm, 1.5 mm, 1.8 mm, 2.0 mm, 2.2 mm, and 2.5 mm, and the thickness of the backlight optical module can be flexibly set according to actual needs.
[0051] Based on the same concept, the utility model embodiment provides a display device, including pattern structure and at least one utility model any embodiment provides the backlight optical module of the utility model, pattern structure is located in the light emitting direction of backlight optical module. Pattern structure includes the part of not transmitting light and transmitting light, and the illumination beam can transmit from the part of transmitting light. The audience who watches pattern structure is located in the side of pattern structure deviating from backlight optical module, and the audience can receive the illumination beam from the part of transmitting light, thereby obtaining the pattern information on pattern structure. Optionally, the display device includes multiple pattern structures and multiple backlight optical modules. Optionally, pattern structure includes the object with pattern and / or character.
[0052] Since the display device includes the backlight optical module provided by any embodiment of the utility model, the display device has the same or corresponding technical effects as the backlight optical module. The display device includes the backlight optical module and the pattern structure, and the pattern structure can be a pattern or character with promotional effects. The backlight optical module has a small thickness, so the display device also has a small thickness, and the display device can be applied to various scenes requiring the use of light to display the pattern or character on the pattern structure. Since the display device has a small thickness, the display device can be installed on a wall or a sign without occupying too much space.
[0053] Optionally, the display device can include two or more pattern structures and two or more backlight optical modules, and the number of pattern structures and backlight optical modules is the same. The two or more pattern structures can include characters that can form a phrase or a sentence, and each pattern structure is installed with a backlight optical module. The backlight optical module can provide uniform light for the pattern structure to completely display the pattern on the pattern structure. The combination of the two or more pattern structures and the backlight optical modules can be installed in a certain order, so that the pattern on the pattern structure can form a meaningful sentence or a combination of pictures to achieve the effect of conveying information. The combination of the two or more pattern structures and the backlight optical modules can be used flexibly to select the shape, avoid a pattern structure including too many ineffective parts without information to form a specific pattern, such as a long strip of characters, and occupy too much space. The combination of the two or more pattern structures and the backlight optical modules can configure the size of each pattern structure and backlight optical module to realize smaller volume of the display device to save space and manufacturing cost under the condition of conveying the same amount of information.
[0054] Optionally, with reference to Figure 9The distance between the pattern structure 401 and the backlight optical module is L, wherein L≤5 mm. L is specifically the distance between the diffuse reflection bottom plate 300 and the pattern structure 401. Since the spot of the illumination light beam gradually becomes larger with the propagation distance, if the pattern structure 401 is too close to the backlight optical module, the spot of the illumination light beam will be too small to completely illuminate the pattern structure 401. Therefore, L needs to be long enough to completely illuminate the pattern structure 401 by the illumination light beam.
[0055] However, the display device provided by the embodiment of the present application uses the diffuse reflection plate to diffuse the illumination light beam. On the one hand, the illumination light beam propagates from the light source 101 to the diffuse reflection bottom plate 300 and then is reflected from the diffuse reflection bottom plate 300 to the illuminated object 400, which is equivalent to that the illumination light beam goes back and forth in the space between the light source 101 and the diffuse reflection bottom plate 400 once. Therefore, the space provides a propagation distance twice as long as the space itself for the illumination light beam, and the illumination light beam can expand its spot to a size large enough to illuminate the entire illuminated object 400 in the process of propagating in the space between the light source 101 and the diffuse reflection bottom plate 400. On the other hand, the diffuse reflection bottom plate 300 can diffuse the illumination light beam. Therefore, the illumination light beam is scattered in all directions on the surface of the diffuse reflection bottom plate 300, and the original spot is scattered by the diffuse reflection bottom plate 300, so that the size of the spot is expanded, and the uniformity of the illumination light beam is further improved. Correspondingly, since the diffuse reflection bottom plate 300 diffuses the illumination light beam, the space between the light source 101 and the diffuse reflection bottom plate 400 can be further reduced. In summary, the backlight optical module provided by the embodiment of the present application can realize that the distance L between the pattern structure 401 and the backlight optical module is less than or equal to 5 mm.
[0056] Optionally, L=4.95 mm. This distance can balance the uniformity of the illumination light beam and the thin design requirement of the display device.
[0057] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims
1. A backlight optical module, characterized in that, The backlight optical module comprises a light source assembly, a reflecting ring and a diffuse reflection bottom plate, the light source assembly comprises a plurality of light sources, the plurality of light sources are located on a side of the reflecting ring close to the diffuse reflection bottom plate and are arranged in a circumferential direction; The light source assembly is used for emitting an illumination light beam; The diffuse reflection bottom plate is used for diffusely reflecting the illumination light beam, so that the illumination light beam forms a uniform light spot.
2. The backlit optical module of claim 1, wherein, The plurality of light sources are located in the same plane, and the plane where the plurality of light sources are located is parallel to the diffuse reflection bottom plate; The plurality of light sources are arranged in a circumferential direction with equal central angles on the reflecting ring.
3. The backlit optical module of claim 2, wherein, The light source assembly comprises 12 light sources.
4. The backlit optical module of claim 1, wherein, The reflecting ring is a concentric circular ring, and a plane where the concentric circular ring is located is parallel to the diffuse reflection bottom plate; The inner diameter of the reflecting ring is R1, the outer diameter of the reflecting ring is R2, and the radius of a circle where the plurality of light sources are located is R3, and there is R1 < R3 < R2.
5. The backlit optical module of claim 4, wherein, The outer diameter R2 is in a range of 15 mm to 80 mm.
6. The backlit optical module of claim 1, wherein, An included angle between a normal plane of a chief ray of the light source and a plane where the diffuse reflection bottom plate is located is α, and there is 80° ≤ α ≤ 85°.
7. The backlit optical module of claim 1, wherein, The diffuse reflection bottom plate comprises a first bottom plate surface on a side close to the reflecting ring, and the first bottom plate surface comprises a plurality of convex substructures and a plurality of concave substructures.
8. The backlit optical module of claim 1, wherein, The thickness of the backlight optical module is D, and there is D ≤ 2.5 mm.
9. A display device, characterized by The pattern structure and the backlight optical module according to any one of claims 1-8 are comprised. The pattern structure is located on a light emitting direction of the backlight optical module.
10. The display device of claim 9, wherein, The distance between the pattern structure and the backlight optical module is L, and there is L ≤ 5 mm.