Backlight module
By setting multiple rows of accommodating recesses on the bottom surface of the light guide plate and setting the light source therein, the problem that traditional backlight modules cannot take into account both thinning, low cost and excellent local backlight adjustment, and the thinning and efficient adjustment effects of the backlight module are achieved.
Patent Information
- Application Number
- CN202510290952.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2025-06-03
AI Technical Summary
Traditional direct-down, side-light and full array backlight modules cannot take into account thinning, low-cost and excellent local backlight adjustment effects.
By setting the light source on the bottom surface of the light guide plate and arranging it into a row of accommodating recesses, the light source emits light toward the light surface, thereby achieving thinning of the backlight module and excellent local backlight adjustment effect.
It realizes thinning and low-cost production of backlight modules, and also has excellent local backlight adjustment effect, solving the shortcomings of traditional backlight modules in these aspects.
Smart Images
Figure CN120085407A_ABST
Abstract
Description
Technical Field
[0001] The present application relates to a light source device, and in particular to a backlight module. Background Art
[0002] Generally speaking, backlight modules are roughly divided into direct-lit, edge-lit and full-array types. The edge-lit backlight module uses a light-emitting diode that emits light from the side and a light guide plate to guide light into the display panel, while the direct-lit and full-array types emit light directly from the back.
[0003] However, the traditional direct-lit, edge-lit and full-array backlight modules cannot take into account thinness, low cost and excellent local backlight adjustment effect. Specifically, the direct-lit backlight module needs to be used with a lens, which makes the overall display thicker; the full-array type requires the entire backlight module to be filled with LEDs, which has the disadvantage of high cost; the edge-lit backlight module has a poor performance in the local backlight adjustment effect because the LEDs are arranged at the outermost edge. Summary of the invention
[0004] The present application provides a backlight module, which achieves thinness, low cost and excellent local backlight adjustment effect by disposing light sources in multiple rows of accommodating recesses on the bottom surface of a light guide plate.
[0005] The backlight module disclosed in one embodiment of the present application includes a substrate, a light guide plate and a plurality of light sources. The light guide plate is disposed on the substrate and has a bottom surface, a top surface and a plurality of accommodating recesses. The bottom surface and the top surface are opposite to each other. The bottom surface is closer to the substrate than the top surface. The accommodating recesses are recessed inward from the bottom surface. Each of the accommodating recesses has a groove bottom surface and at least one light incident surface connected to the groove bottom surface. The normal direction of the light incident surface is not parallel to the normal direction of the bottom surface. The light source is electrically connected to the substrate and disposed in the accommodating recess of the light guide plate. Each light source is used to emit light toward at least one light incident surface of one of the accommodating recesses.
[0006] According to the backlight module disclosed in the above embodiment, the receiving recess is recessed inward from the bottom surface of the light guide plate, and the light source is arranged in the receiving recess and is used to emit light toward at least one light incident surface of one of the receiving recesses. Therefore, the lens in the general direct-type backlight module can be omitted, and the light guide plate is used as the light guide medium of the light source to achieve the thinning of the display using the backlight module. In addition, even if the light source arranged in the receiving recess does not cover the entire backlight module, it can also have an excellent local backlight adjustment effect. In this way, the backlight module can take into account thinness, low cost and excellent local backlight adjustment effect. BRIEF DESCRIPTION OF THE DRAWINGS
[0007] Figure 1 It is a side view of a display panel and a backlight module according to the first embodiment of the present application.
[0008] Figure 2 For Figure 1 the top view schematic diagram of the light guide plate, light shielding structure and light source in the backlight module in
[0009] Figure 3 For Figure 2 the partial enlarged view of the light guide plate and light source in
[0010] Figure 4 For Figure 1 the partial enlarged view of the side view schematic diagram of the light guide plate in the backlight module in
[0011] Figure 5 For the partial enlarged view of the top view schematic diagram of the light guide plate and light source according to the second embodiment of the present application.
[0012] Figure 6 For the partial enlarged view of the top view schematic diagram of the light guide plate according to the third embodiment of the present application.
[0013] Figure 7 For the partial enlarged view of the top view schematic diagram of the light guide plate according to the fourth embodiment of the present application.
[0014] Figure 8 For the partial enlarged view of the top view schematic diagram of the light guide plate according to the fifth embodiment of the present application.
[0015] Figure 9 For the partial enlarged view of the top view schematic diagram of the light guide plate according to the sixth embodiment of the present application. Detailed implementation manners
[0016] The following details the detailed features and advantages of the embodiments of the present application in the implementation manners. The content is sufficient for any person with ordinary knowledge in the field to understand the technical content of the embodiments of the present application and implement accordingly. And according to the content disclosed in this specification, the claims and the drawings, any person with ordinary knowledge in the field can easily understand the related purposes and advantages of the present application. The following embodiments further illustrate the viewpoints of the present application, but do not limit the scope of the present application in any way.
[0017] Please refer to Figures 1 to 4 . Figure 1 For the side view schematic diagram of the display panel and the backlight module according to the first embodiment of the present application. Figure 2 For Figure 1 the top view schematic diagram of the light guide plate, light shielding structure and light source in the backlight module in Figure 3 For Figure 2 the partial enlarged view of the light guide plate and light source in Figure 4 For Figure 1 the partial enlarged view of the side view schematic diagram of the light guide plate in the backlight module in
[0018] In this embodiment, as Figure 1 and Figure 2 shown, the backlight module 10 includes a substrate 100, a reflective layer 200, a light guide plate 300, a plurality of light sources 350, a plurality of first light-shielding structures 360, a plurality of second light-shielding structures 370, a top diffusion plate 400, a diffusion film 500, and two prism sheets 600, 650. The backlight module 10 is used to transmit light to the display panel 20. The backlight module 10 and the display panel 20 can be accommodated in a housing (not shown) of the display.
[0019] The substrate 100 can be, for example, a circuit board. The reflective layer 200 is disposed on the substrate 100.
[0020] The light guide plate 300 is disposed on the substrate 100. Further, the reflective layer 200 is disposed between the light guide plate 300 and the substrate 100. That is, the light guide plate 300 is disposed on the substrate 100 through the reflective layer 200, for example. The light guide plate 300 has a bottom surface 301, a top surface 302, and a plurality of accommodation recesses 303. The bottom surface 301 and the top surface 302 face away from each other. The bottom surface 301 is closer to the substrate 100 than the top surface 302. The accommodation recesses 303 are recessed inward from the bottom surface 301 and arranged in multiple rows along an arrangement direction A1 (parallel to the X-axis direction). The arrangement direction A1 is not parallel to the normal direction N1 (parallel to the Z-axis direction) of the bottom surface 301, such as being perpendicular to each other. Each row of the accommodation recesses 303 includes at least two accommodation recesses 303. In this embodiment, the accommodation recesses 303 in each row are aligned with each other such that these accommodation recesses 303 are arranged in a 3 by 13 array, for example. That is, the accommodation recesses 303 of this embodiment can be understood as being arranged in 3 rows along the arrangement direction A1, and each row of accommodation recesses 303 includes 13 accommodation recesses 303, or can be understood as being arranged in 13 rows along the arrangement direction A2 (perpendicular to the arrangement direction A1 and parallel to the Y-axis direction), and each row of accommodation recesses 303 includes 3 accommodation recesses 303.
[0021] As Figure 3 shown, each of the accommodation recesses 303 has a groove bottom surface 304 and a plurality of light-incident surfaces 305 connected to the groove bottom surface 304. These light-incident surfaces 305 are adjacent to each other and not parallel to each other. Moreover, the normal direction N2 of the light-incident surfaces 305 is not parallel to the normal direction N1 of the bottom surface 301, such as being perpendicular to each other. In this embodiment, the accommodation recesses 303 are, for example, rectangular. Therefore, each accommodation recess 303 has four light-incident surfaces 305, for example. The normal directions N2 of two of the light-incident surfaces 305 are opposite to each other and parallel to the X-axis direction. The normal directions N2 of the other two light-incident surfaces 305 are opposite to each other and parallel to the Y-axis direction.
[0022] The light source 350 is electrically connected to the substrate 100 and is disposed, for example, in the accommodation recesses 303 of the light guide plate 300 respectively. That is to say, in the present embodiment, one light source 350 is accommodated in one accommodation recess 303, for example. Each light source 350 is used to emit light toward at least one light incident surface 305 of one of the accommodation recesses 303. Specifically, in the present embodiment, the light sources 350 each have a plurality of light emitting surfaces 351, and these light emitting surfaces 351 of each light source 350 face these light incident surfaces 305 respectively in one of the corresponding accommodation recesses 303. That is to say, in the present embodiment, each light source 350 emits light toward all the light incident surfaces 305 of the accommodation recess 303 that houses it. In addition, these light sources 350 are, for example, light emitting diodes (LEDs) and can have any color composition such as blue light, blue-green light, ultraviolet light, etc.
[0023] It should be noted that in other embodiments, a plurality of light sources may also be accommodated in one accommodation recess.
[0024] In addition, in the present embodiment, as Figure 4 shown, the bottom surface 301 of the light guide plate 300 has a plurality of microstructures 3010, for example. The microstructures 3010 are, for example, grooves and are used to guide the light emitted by the light source 350 to a desired direction. In other embodiments, the bottom surface of the light guide plate may not have the microstructures 3010 either.
[0025] As Figure 2 and Figure 4 shown, these first light shielding structures 360 are disposed in the light guide plate 300 in parallel with each other. These second light shielding structures 370 are disposed in the light guide plate 300 in parallel with each other. These first light shielding structures 360 and these second light shielding structures 370 are between the bottom surface 301 and the top surface 302 and are formed in the light guide plate 300 by any suitable means such as laser processing, machining, transfer printing, embossing, etc., for example. The extension direction E1 (parallel to the Y-axis direction) of these first light shielding structures 360 is not parallel to (such as perpendicular to) the extension direction E2 (parallel to the X-axis direction) of these second light shielding structures 370, and these first light shielding structures 360 and these second light shielding structures 370 intersect with each other, so that these first light shielding structures 360 and these second light shielding structures 370 separate these light sources 350 from each other. In this way, the first light shielding structure 360 and the second light shielding structure 370 can prevent the light emitted by different light sources 350 from mixing with each other, thereby improving the effect of local dimming.
[0026] In the present embodiment, the light transmittance of the first light shielding structure 360 and the second light shielding structure 370 is, for example, less than ten percent. In addition, in the present embodiment, as Figure 4As shown, the thickness T1 of the first light-shielding structure 360 and the second light-shielding structure 370 is greater than or equal to 10% and less than or equal to 90% of the thickness T2 of the light guide plate 300, such as 80%. Through the above light transmittance design and / or the above thickness design, the first light-shielding structure 360 and the second light-shielding structure 370 can further prevent the light emitted by different light sources 350 from mixing with each other. It should be noted that the effect of local dimming can also be improved by controlling the light emitted by the light source 350 from different light-emitting surfaces 351. In such an embodiment, the backlight module may not need to include the first light-shielding structure 360 and the second light-shielding structure 370. In addition, the thickness T2 of the light guide plate 300 is, for example, greater than or equal to 0.1 mm and less than or equal to 2 mm.
[0027] The top diffusion plate 400 is disposed on the side of the light guide plate 300 away from the substrate 100. Or rather, the top diffusion plate 400 is disposed on the top surface 302 of the light guide plate 300. In addition, the top diffusion plate 400 is in contact with or adjacent to the top surface 302 of the light guide plate 300. Therefore, the mixing distance (Optical Distance, OD) of the backlight module 10 will be minimized as much as possible (that is, the distance between the light source 350 and the top diffusion plate 400 will be minimized as much as possible), which enables the display using the backlight module 10 to be easily thinned.
[0028] The diffusion film 500 is disposed on the top diffusion plate 400. The prism sheet 600 is disposed on the diffusion film 500. The prism sheet 650 is disposed on the prism sheet 600. It should be noted that in this embodiment, the backlight module 10 includes the reflective layer 200, the top diffusion plate 400, the diffusion film 500, and the prism sheets 600 and 650 according to actual needs. In other embodiments, the backlight module 10 may not need to include the reflective layer 200, the top diffusion plate 400, the diffusion film 500, and the prism sheets 600 and 650.
[0029] Other embodiments will be listed below for illustration. It must be noted here that the following embodiments follow the component numbers and some contents of the foregoing embodiments, where the same numbers are used to represent the same or similar components, and the description of the same technical content is omitted. For the description of the omitted parts, reference can be made to the foregoing embodiments, and the following embodiments will not be repeated.
[0030] The present application is not limited to the configuration of the light-emitting surface of the light source. Please refer to Figure 5 , Figure 5A partial enlarged view of a top view schematic diagram of a light guide plate and a light source according to a second embodiment of the present application. In this embodiment, the light source 350a has only one light emitting surface 351a. The light emitting surface 351a of each light source 350a faces one of the light incident surfaces 305 in one of the corresponding accommodating recesses 303. In addition, the normal directions N2 of the light incident surfaces 305 faced by the light emitting surfaces 351a of adjacent light sources 350a are different from each other. It should be noted that the light source 350a of this embodiment can replace the light source 350 of the first embodiment and be included in the backlight module 10.
[0031] The present application is not limited to the shape of the accommodating recess. Please refer to Figure 6 , Figure 6 A partial enlarged view of a top view schematic diagram of a light guide plate according to a third embodiment of the present application. In this embodiment, for example, the accommodating recess 303b of the light guide plate 300b is circular and has an annular light incident surface 305b.
[0032] Or, please refer to Figure 7 , Figure 7 A partial enlarged view of a top view schematic diagram of a light guide plate according to a fourth embodiment of the present application. In this embodiment, for example, the accommodating recess 303c of the light guide plate 300c is hexagonal and has six light incident surfaces 305c.
[0033] The present application is not limited to the arrangement of the accommodating recesses. Please refer to Figure 8 , Figure 8 A partial enlarged view of a top view schematic diagram of a light guide plate according to a fifth embodiment of the present application. In this embodiment, these accommodating recesses 303d of the light guide plate 300d are arranged in multiple rows along the arrangement direction A2, and the accommodating recesses 303d in adjacent rows are offset from each other.
[0034] Or, please refer to Figure 9 , Figure 9 A partial enlarged view of a top view schematic diagram of a light guide plate according to a sixth embodiment of the present application. In this embodiment, these accommodating recesses 303e of the light guide plate 300e are arranged in multiple rows along the arrangement direction A1, and the accommodating recesses 303e in adjacent rows are offset from each other.
[0035] It should be noted that the light guide plate 300b of the third embodiment, the light guide plate 300c of the fourth embodiment, the light guide plate 300d of the fifth embodiment, or the light guide plate 300e of the sixth embodiment can replace the light guide plate 300 of the first embodiment and be included in the backlight module 10.
[0036] According to the backlight module disclosed in the above embodiments, the accommodating recess is recessed inward from the bottom surface of the light guide plate, and the light sources are disposed in the accommodating recesses and each used for emitting light toward at least one light incident surface of one of the accommodating recesses. Therefore, the lenses in a general direct-lit backlight module can be omitted, and the light guide plate is used as the light guiding medium for the light sources, so that the display using the backlight module can be thinned. In addition, even if the light sources disposed in the accommodating recesses do not cover the entire backlight module, excellent local backlight adjustment effects can be achieved. In this way, the backlight module can take into account thinning, low cost, and excellent local backlight adjustment effects.
[0037] The above embodiments are only used to illustrate the technical solutions of the present application and not to limit them. Although the present application has been described in detail with reference to the above preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present application can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present application.
Claims
1. A backlight module, characterized in that: Include: a substrate; a light guide plate, disposed on the substrate and having a bottom surface, a top surface and a plurality of accommodating recesses, the bottom surface and the top surface facing away from each other, the bottom surface being closer to the substrate than the top surface, the accommodating recesses being recessed inward from the bottom surface, each of the accommodating recesses having a groove bottom surface and at least one light incident surface connected to the groove bottom surface, the normal direction of the light incident surface being not parallel to the normal direction of the bottom surface; as well as A plurality of light sources are electrically connected to the substrate and disposed in the receiving recess of the light guide plate, and each of the light sources is used to emit light toward the at least one light incident surface of one of the receiving recesses.
2. The backlight module according to claim 1, wherein: The accommodating recesses are arranged into a plurality of rows along an arrangement direction, and the accommodating recesses in each row are aligned with each other so that the accommodating recesses are arranged into an array.
3. The backlight module according to claim 1, wherein: The accommodating recesses are arranged into a plurality of rows along an arrangement direction, and the accommodating recesses in adjacent rows are staggered with each other.
4. The backlight module according to claim 1, wherein: The light sources are respectively arranged in the accommodating recesses.
5. The backlight module according to claim 4, wherein: Each of the light sources has a light-emitting surface, and the number of the at least one light-entering surface of each of the accommodating recesses is multiple. The light-entering surfaces of each of the accommodating recesses are adjacent to each other and are not parallel to each other. The light-emitting surface of each of the light sources faces one of the light-entering surfaces in a corresponding one of the accommodating recesses.
6. The backlight module according to claim 4, wherein: Each of the light sources has a plurality of light-emitting surfaces, and each of the accommodating recesses has a plurality of at least one light-entering surfaces, the light-entering surfaces of each of the accommodating recesses are adjacent to each other and are not parallel to each other, and the light-emitting surface of each of the light sources faces the light-entering surface in a corresponding one of the accommodating recesses.
7. The backlight module according to claim 1, wherein: It also includes a plurality of first light shading structures and a plurality of second light shading structures, wherein the first light shading structures are arranged in parallel with each other in the light guide plate, and the second light shading structures are arranged in parallel with each other in the light guide plate, the extension direction of the first light shading structure is not parallel to the extension direction of the second light shading structure, and the first light shading structure and the second light shading structure intersect with each other, so that the first light shading structure and the second light shading structure separate the light sources from each other.
8. The backlight module according to claim 1, wherein: The invention also comprises a top diffusion plate, which is arranged on a side of the light guide plate away from the substrate.
9. The backlight module according to claim 8, wherein: The top diffusion plate is in contact with or adjacent to the light guide plate.
10. The backlight module according to claim 1, wherein: The bottom surface of the light guide plate has a plurality of microstructures.