Backlight module and display device
By setting a second reflective sheet with a reflectivity higher than the first reflective sheet at the corner position of the first reflective sheet of the direct-down backlight module and setting an anti-reflection structure thereon, the problem of darkness at the corner of the direct-down backlight module is solved, and the light uniformity is improved and the bright angle problem is avoided.
Patent Information
- Application Number
- CN202421402813.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-19
- Publication Date
- 2025-03-11
- Estimated Expiration
- 2034-06-19
AI Technical Summary
The direct-down backlight module has the problem of darkness in the corners, resulting in insufficient light uniformity and reducing the user's visual experience.
A second reflective sheet is provided at a corner position of the first reflective sheet, and its reflectivity is greater than that of the first reflective sheet, which increases the light intensity at the corner position, and an anti-reflection structure is provided on the second reflective sheet to adjust the reflectivity and avoid the occurrence of bright angle problems.
It effectively improves the light uniformity of the direct-down backlight module, avoids the problem of viscera and avoids the problem of bright angle due to excessive reflectivity.
Smart Images
Figure CN222600016U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the display field, in particular to a backlight module and a display device. Background Art
[0002] With the development of science and technology, people's demand for display devices is getting higher and higher. Display devices generally include backlight modules and display panels. The display panel is set on the backlight module, and the backlight module provides backlight for the display panel. The backlight module can be divided into edge-entry backlight modules and direct-type backlight modules according to the light input setting. Due to the advantages of high brightness, low cost, simple assembly method, etc., the direct-type backlight module has been more and more widely used.
[0003] Among them, the direct-type backlight module usually includes an LED light board and a reflective sheet. The lamp beads on the LED light board are generally arranged at equal intervals, which limits the light-emitting angle of the LED lamp beads. The light emitted by the LED lamp beads is reflected by the reflective sheet and then emitted. At this time, the LED light energy in the edge corners of the direct-type backlight module is relatively low, which makes the direct-type backlight module dark in the corners, reducing the user's visual experience.
[0004] Therefore, how to improve the light uniformity of the direct-lit backlight module is an urgent problem to be solved. Utility Model Content
[0005] The utility model provides a backlight module and a display device to solve the above technical problems.
[0006] In order to achieve the above-mentioned purpose, the utility model proposes a backlight module, which includes a bottom plate, a side plate, a first reflective sheet, a second reflective sheet, an anti-reflection structure and a light-emitting module; the side plate has a first connecting plate and a second connecting plate connected to the first corner, and the first connecting plate, the second connecting plate and the bottom plate are mutually connected to form a accommodating space; the first reflective sheet is arranged on the first connecting plate and the second connecting plate; the second reflective sheet is arranged on the first reflective sheet corresponding to the first corner and faces the accommodating space; the anti-reflection structure is arranged on the second reflective sheet and faces the accommodating space; the light-emitting module is located on the bottom plate, and the light-emitting module includes a circuit board and a plurality of light-emitting units arranged in an array on the circuit board; wherein the first reflective sheet has a first reflectivity, the second reflective sheet has a second reflectivity, and the second reflectivity is greater than the first reflectivity.
[0007] As an optional technical solution, in the direction in which the side plate is away from the bottom plate, the first reflection sheet has a first height, the second reflection sheet has a second height, and the first height is equal to the second height.
[0008] As an optional technical solution, the second reflector includes a first sub-reflector and a second sub-reflector connected to the first corner, and the first sub-reflector and the second sub-reflector are respectively located on the first reflector corresponding to the first connecting plate and the first reflector corresponding to the second connecting plate.
[0009] As an optional technical solution, the anti-reflection structure is at least one through hole, the total area of the at least one through hole is not greater than 50% of the total area of the second reflector, the at least one through hole passes through the second reflector, and the at least one through hole is located on the first sub-reflector and / or the second sub-reflector.
[0010] As an optional technical solution, the anti-reflection structure is a first diffuser, which has a first sub-diffuser and a second sub-diffuser. The first sub-diffuser is located on the first sub-reflector, and the second sub-diffuser is located on the second sub-reflector.
[0011] As an optional technical solution, the first sub-diffuser sheet is connected to the second sub-diffuser sheet, or the first sub-diffuser sheet is not connected to the second sub-diffuser sheet, or at least one side edge of the first diffuser sheet exceeds the second reflective sheet.
[0012] As an optional technical solution, the side panel also has a third connecting plate and a fourth connecting plate, the third connecting plate is opposite to the first connecting plate, the fourth connecting plate is opposite to the second connecting plate, the third connecting plate and the second connecting plate are connected at the second corner, the fourth connecting plate and the third connecting plate are connected at the third corner, the fourth connecting plate and the first connecting plate are connected at the fourth corner, and the first reflective sheet is also arranged on the third connecting plate and the fourth connecting plate.
[0013] As an optional technical solution, the second reflective sheet is located at at least one of the first corner, the second corner, the third corner and the fourth corner.
[0014] As an optional technical solution, the edge of the second reflective sheet does not exceed the fifth light-emitting unit adjacent to the first corner, or the edge of the second reflective sheet is between the first light-emitting unit and the second light-emitting unit adjacent to the first corner.
[0015] In addition, the utility model also provides a display device, which includes a display panel and any one of the backlight modules described above, wherein the display panel is located on the backlight module.
[0016] The utility model provides a backlight module and a display device. A second reflector is arranged on a first reflector at a position corresponding to a corner. The reflectivity of the second reflector is greater than that of the first reflector, so that the intensity of light reflected at the corner is higher, thereby avoiding the dark corner problem of a direct-type backlight module. Furthermore, an anti-reflection structure is also arranged on the second reflector to adjust the overall reflectivity of the second reflector, thereby avoiding the dark corner problem in the corner from becoming a bright corner problem due to the reflectivity of the second reflector being too high, thereby improving the light uniformity of the direct-type backlight module. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings.
[0018] Figure 1 This is a schematic structural diagram of a backlight module according to a first embodiment of the present utility model;
[0019] Figure 2 It is a partial enlarged schematic diagram of the backlight module of the first embodiment of the utility model;
[0020] Figure 3 It is a partial enlarged schematic diagram of the backlight module of the second embodiment of the utility model;
[0021] Figure 4 It is a schematic structural diagram of the display device of the present utility model. DETAILED DESCRIPTION
[0022] In order to more clearly illustrate the utility model, the utility model is further described below in conjunction with preferred embodiments and drawings. Similar components in the drawings are represented by the same reference numerals. Those skilled in the art should understand that the content described below is illustrative rather than restrictive, and should not be used to limit the scope of protection of the utility model.
[0023] Please refer to Figure 1 and Figure 2 , Figure 1 FIG. 1 is a schematic structural diagram of a backlight module of the first embodiment of the utility model. Figure 2 FIG. 1 is a partially enlarged schematic diagram of the backlight module of the first embodiment of the utility model. Figure 1 and Figure 2As shown, the utility model provides a backlight module 100, which includes a bottom plate 10, a side plate 20, a first reflective sheet 30, a second reflective sheet 40 and an anti-reflection structure 50; the side plate 20 has a first connecting plate 21 and a second connecting plate 22 connected to a first corner 25, and the first connecting plate 21, the second connecting plate 22 and the bottom plate 10 are connected to each other to form a receiving space; the first reflective sheet 30 is arranged on the first connecting plate 21 and the second connecting plate 22; the second reflective sheet 40 is arranged on the first reflective sheet 30 corresponding to the first corner 25 and faces the receiving space; the anti-reflection structure 50 is arranged on the second reflective sheet 40 and faces the receiving space; wherein, the first reflective sheet 30 has a first reflectivity R1, the second reflective sheet 40 has a second reflectivity R2, and the second reflectivity R2 is greater than the first reflectivity R1.
[0024] In this embodiment, the first reflective sheet 30 is, for example, a white reflective layer or a white reflective sheet, and the second reflective sheet 40 is, for example, a silver reflective layer or a film provided with a silver reflective layer, but is not limited to this in practical applications. The second reflective sheet 40 is attached to the first reflective sheet 30, and the first reflective sheet 30 and the second reflective sheet 40 are used to reflect the light they receive to achieve secondary utilization of the light.
[0025] The backlight module 100 of the present invention sets a second reflector 40 with a higher reflectivity than the first reflector 30 at a position of the first reflector 30 corresponding to the first corner 25, so that the intensity of light reflected at the first corner 25 is higher, thereby avoiding the dark corner problem of the backlight module 100 and improving the light uniformity of the backlight module 100.
[0026] In one embodiment, in the direction in which the side plate 20 is away from the bottom plate 10, the first reflector 30 has a first height H1, the second reflector 40 has a second height H2, and the first height H1 is equal to the second height H2. Further, the height of the side plate 20 here is also the first height H1, so that in the direction in which the side plate 20 is away from the bottom plate 10, the first reflector 30, the second reflector 40 and the edge of the side plate 20 are aligned, but not limited thereto. Figure 1 and Figure 2As shown, the second reflector 40 includes a first sub-reflector 41 and a second sub-reflector 42 connected to the first corner 25, and the first sub-reflector 41 and the second sub-reflector 42 are respectively located on the first reflector 30 corresponding to the first connecting plate 21 and the first reflector 41 corresponding to the second connecting plate 22. That is to say, at the first corner 25, the heights of the first sub-reflector 41 and the second sub-reflector 42 are equal to the height of the first reflector 30, and the second reflector 40 completely covers the first reflector 30, so that the reflectivity of the reflector corresponding to the first corner 25 is higher, and the intensity of the reflected light is higher than that of the area not covered by the second reflector 40, thereby improving the brightness of the first corner 25 in the backlight module 100. In the present embodiment, the second reflector 40 includes a first sub-reflector 41 and a second sub-reflector 42 connected to each other, and the second height H2 of the second reflector 40 is equal to the first height H1 of the first reflector 30, but this is not limited to the actual application. The second reflector 40 may only include the first sub-reflector 41 or the second sub-reflector 42, that is, the second reflector 40 may only be arranged on the first reflector 30 corresponding to the first connecting plate 21 or on the first reflector 41 corresponding to the second connecting plate 22. At the same time, the second height H2 may be slightly smaller than the first height H1, as long as the brightness at the first corner 25 can be improved.
[0027] In one embodiment, the side panel 20 further has a third connecting plate 23 and a fourth connecting plate 24, the third connecting plate 23 is opposite to the first connecting plate 21, the fourth connecting plate 24 is opposite to the second connecting plate 22, the third connecting plate 23 and the second connecting plate 22 are connected at the second corner 26, the fourth connecting plate 24 and the third connecting plate 23 are connected at the third corner 27, the fourth connecting plate 24 and the first connecting plate 21 are connected at the fourth corner 28, and the first reflective sheet 30 is also disposed on the third connecting plate 23 and the fourth connecting plate 24. The first connecting plate 21, the second connecting plate 22, the third connecting plate 23 and the fourth connecting plate 24 are connected in sequence to form a rectangular frame, and the first connecting plate 21, the second connecting plate 22, the third connecting plate 23 and the fourth connecting plate 24 are connected to each other with the bottom plate 10, thereby forming a frame of the backlight module 100 with an opening on the top surface. Correspondingly, the first reflective sheet 30 is arranged on the first connecting plate 21, the second connecting plate 22, the third connecting plate 23 and the fourth connecting plate 24, and the first reflective sheet 30 also forms a rectangular frame structure.
[0028] In one embodiment, the second reflector 40 is located at at least one of the first corner 25, the second corner 26, the third corner 27 and the fourth corner 28. In this embodiment, the first corner 25, the second corner 26, the third corner 27 and the fourth corner 28 are all provided with the second reflector 40, and the size of the second reflector 40 at each corner is the same, but this is not limited to the actual application. The second reflector 40 can be set at one, two or three corners according to actual conditions, and the size of the second reflector 40 set at each corner can also be different.
[0029] In one embodiment, the anti-reflection structure 50 is at least one through hole 51, at least one through hole 51 passes through the second reflector 40, and at least one through hole 51 is located on the first sub-reflector 41 and / or the second sub-reflector 42. In this embodiment, the first sub-reflector 41 and the second sub-reflector 42 are both provided with through holes 51, but this is not limited to the actual application. The through holes 51 can be provided on the first sub-reflector 41 and / or the second sub-reflector 42 as needed. Furthermore, the total area of at least one through hole 51 may not be greater than 50% of the total area of the second reflector 40. Since the through hole 51 directly penetrates the second reflector 40, that is, the first reflector 30 below will be exposed at the place corresponding to the through hole 51, and since the first reflectivity R1 of the first reflector 30 is less than the second reflectivity R2 of the second reflector 40, that is, the second reflector 40 provided with the through hole 51 has a third reflectivity R3 as a whole, and the third reflectivity R3 is between the first reflectivity R1 and the second reflectivity R2, the reflectivity of the second reflector 40 as a whole can be slightly reduced by providing the through hole 51, so as to avoid using the second reflector 40 at the corner, which leads to a high reflectivity there, and turns the problem of dark corners into a problem of bright corners. In this embodiment, the through hole 51 is circular, but it is not limited to this in actual applications, and can be triangular, square, etc. The shape, size and distribution density of the through hole 51 can be selected according to actual needs. For example, near the first corner 25, the size of the through hole 51 is getting smaller or the density of the through hole 51 is getting smaller.
[0030] In one embodiment, the backlight module 100 further includes a light-emitting module 60, which is located on the bottom plate 10. The light-emitting module 60 includes a circuit board (not shown) and a plurality of light-emitting units arranged in an array on the circuit board. The plurality of light-emitting units are evenly arranged on the circuit board and electrically connected to the circuit board. The edge of the second reflector 40 may not exceed the fifth light-emitting unit adjacent to the first corner 25. In this way, the second reflector 40 can ensure the effect of brightening the light in the corner and avoid affecting the light in the adjacent corner. Further, if Figure 2 As shown, the edge of the second reflective sheet 40 may be between the first light emitting unit and the second light emitting unit adjacent to the first corner 25 , but the present invention is not limited thereto.
[0031] Please refer to Figure 3 , Figure 3 FIG. 2 is a partial enlarged schematic diagram of a backlight module of the second embodiment of the present utility model. Figure 3 As shown, the difference from the first embodiment is that the anti-reflection structure 50 of this embodiment is a first diffuser 52, the first diffuser 52 has a first sub-diffuser 521 and a second sub-diffuser 522, the first sub-diffuser 521 is located on the first sub-reflector 41, the second sub-diffuser 522 is located on the second sub-reflector 42, and the first diffuser 52 is a low-haze diffuser that can adjust the reflection intensity of light. In the direction in which the side plate 20 is away from the bottom plate 10, the first diffuser 52 has a third height H3, and the third height H3 can be equal to the second height H2, or the third height H3 can be slightly less than the second height H2.
[0032] In this embodiment, the first sub-diffuser sheet 521 and the second sub-diffuser sheet 522 are connected to each other at the first corner 25, and the sizes of the first sub-diffuser sheet 521 and the second sub-diffuser sheet 522 are equal to the sizes of the first sub-reflector sheet 41 and the second sub-reflector sheet 42, that is, the first diffuser sheet 52 completely covers the second reflector sheet 40 (or at least one side edge of the first diffuser sheet 52 may exceed the second reflector sheet 40), or, the first sub-diffuser sheet 521 and the second sub-diffuser sheet 522 are not connected, and the sizes of the first sub-diffuser sheet 521 and the second sub-diffuser sheet 522 are slightly smaller than the sizes of the first sub-reflector sheet 41 and the second sub-reflector sheet 42, and the sizes and positions of the first sub-diffuser sheet 521 and the second sub-reflector sheet 522 may be set according to actual needs.
[0033] Please refer to Figure 4 , Figure 4 FIG. 1 is a schematic diagram of the structure of the display device of the present utility model. Figure 4 As shown, the display device 200 includes the aforementioned backlight module 100 and a display panel 300. The display panel 300 is located on the aforementioned backlight module 100. The aforementioned backlight module 100 can provide a backlight source for the display panel 300. The display device 200 is, for example, a vehicle-mounted display device.
[0034] In summary, the utility model provides a backlight module and a display device, in which a second reflective sheet is arranged on a first reflective sheet at a position corresponding to a corner, and the reflectivity of the second reflective sheet is greater than the reflectivity of the first reflective sheet, so that the intensity of light reflected at the corner position is higher, thereby avoiding the dark corner problem of the direct-type backlight module. Furthermore, an anti-reflection structure is also arranged on the second reflective sheet, which can adjust the overall reflectivity of the second reflective sheet, thereby avoiding the reflectivity of the second reflective sheet being too high, which causes the dark corner problem in the corner to become a bright corner problem, thereby improving the light uniformity of the direct-type backlight module.
[0035] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not limitations on the implementation methods of the present invention. For ordinary technicians in the relevant field, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the implementation methods here. All obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.
Claims
1. A backlight module, characterized in that: The backlight module includes: Base plate; The side plate has a first connecting plate and a second connecting plate connected to the first corner, and the first connecting plate, the second connecting plate and the bottom plate are connected to each other to form a receiving space; A first reflective sheet, disposed on the first connecting plate and the second connecting plate; A second reflection sheet is disposed on the first reflection sheet corresponding to the first corner and faces the accommodation space; An anti-reflection structure, disposed on the second reflective sheet and facing the accommodation space; as well as A light-emitting module, the light-emitting module is located on the bottom plate, and the light-emitting module comprises a circuit board and a plurality of light-emitting units arranged in an array on the circuit board; The first reflective sheet has a first reflectivity, the second reflective sheet has a second reflectivity, and the second reflectivity is greater than the first reflectivity.
2. The backlight module according to claim 1, characterized in that: In the direction in which the side plate is away from the bottom plate, the first reflection sheet has a first height, the second reflection sheet has a second height, and the first height is equal to the second height.
3. The backlight module according to claim 1, characterized in that: The second reflector includes a first sub-reflector and a second sub-reflector connected to the first corner. The first sub-reflector and the second sub-reflector are respectively located on the first reflector corresponding to the first connecting plate and the first reflector corresponding to the second connecting plate.
4. The backlight module according to claim 3, characterized in that: The anti-reflection structure is at least one through hole, the total area of the at least one through hole is not greater than 50% of the total area of the second reflector, the at least one through hole passes through the second reflector, and the at least one through hole is located on the first sub-reflector and / or the second sub-reflector.
5. The backlight module according to claim 3, characterized in that: The anti-reflection structure is a first diffusion sheet. The first diffusion sheet has a first sub-diffusion sheet and a second sub-diffusion sheet. The first sub-diffusion sheet is located on the first sub-reflection sheet, and the second sub-diffusion sheet is located on the second sub-reflection sheet.
6. The backlight module according to claim 5, characterized in that: The first sub-diffuser sheet is connected to the second sub-diffuser sheet, or the first sub-diffuser sheet is not connected to the second sub-diffuser sheet, or at least one side edge of the first diffuser sheet exceeds the second reflective sheet.
7. The backlight module according to claim 1, characterized in that: The side panel also has a third connecting plate and a fourth connecting plate, the third connecting plate is opposite to the first connecting plate, the fourth connecting plate is opposite to the second connecting plate, the third connecting plate and the second connecting plate are connected at the second corner, the fourth connecting plate and the third connecting plate are connected at the third corner, the fourth connecting plate and the first connecting plate are connected at the fourth corner, and the first reflective sheet is also arranged on the third connecting plate and the fourth connecting plate.
8. The backlight module according to claim 7, characterized in that: The second reflection sheet is located at at least one of the first corner, the second corner, the third corner and the fourth corner.
9. The backlight module according to claim 1, characterized in that: The edge of the second reflection sheet does not exceed the fifth light emitting unit adjacent to the first corner, or the edge of the second reflection sheet is between the first light emitting unit and the second light emitting unit adjacent to the first corner.
10. A display device, characterized in that: The display device comprises a display panel and a backlight module according to any one of claims 1 to 9, wherein the display panel is located on the backlight module.