Backlight module and display device

Abstract

The embodiment of the present invention discloses a backlight module and a display device. The backlight module includes: a back plate and a light source located on the back plate near the light-emitting side of the backlight module, the backlight module includes a first light-emitting area and a second light-emitting area, the back plate in the first light-emitting area protrudes toward the light-emitting side of the backlight module, the light mixing distance of the first light-emitting area is smaller than the light mixing distance of the second light-emitting area, so that the light mixing distance of the first light-emitting area is less than that of the second light-emitting area to form a space for accommodating electronic materials such as a mainboard and a power supply, thereby arranging the mainboard, the power supply and other electronic materials and the backlight module as a whole to form a complete machine state, so that the rear shell of the whole machine and the height of the back plate are kept flush, the thickness of the whole machine is effectively reduced, and the overall consistent appearance characteristics are achieved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the technical field of a backlight source structure, and in particular to a backlight module and a display device. Background Art

[0002] In recent years, flat panel display technology has developed by leaps and bounds, and the demand for thin, light, large-size liquid crystal displays is increasing. Since liquid crystal is a material that cannot emit light, liquid crystal displays require a backlight under the liquid crystal to present images. Backlight sources are generally divided into side-lit and direct-lit types based on the position of the light source.

[0003] For direct-type backlight sources, the light source is directly installed at the bottom of the backlight source. On the basis of the original backlight module, it is necessary to add a motherboard, a power light and other electronic equipment to form a complete machine. Adding similar electronic equipment will increase the thickness of the whole machine, destroy the appearance of the whole machine, increase the thickness of the wall mounting, and at the same time increase the packaging material cost of the whole machine and reduce the amount of transportation loading. Summary of the invention

[0004] The embodiments of the present invention provide a backlight module and a display device to reduce the thickness of the whole device, utilize the saved space to accommodate electronic components, and make the rear shell and the back plate of the whole device at the same height to achieve overall consistent appearance characteristics.

[0005] In a first aspect, an embodiment of the present invention provides a backlight module, comprising a back plate and a light source located on the back plate near a light emitting side of the backlight module;

[0006] The backlight module comprises a first light emitting area and a second light emitting area, and the back plate in the first light emitting area protrudes toward the light emitting side of the backlight module.

[0007] Optionally, the light source includes a plurality of light bar(s), the light bar(s) in the first light emitting area are reflective light bar(s), and the light bar(s) in the second light emitting area are refractive light bar(s).

[0008] Optionally, the light bar extends along a first direction, and the first direction is perpendicular to an arrangement direction of the first light-emitting area and the second light-emitting area;

[0009] The first light-emitting area further comprises a refractive light bar, and the refractive light bar is located on a side of the reflective light bar in the first light-emitting area away from the second light-emitting area.

[0010] Optionally, the distance between the adjacent light bars in the first light-emitting area and the second light-emitting area is A, and in the first light-emitting area, the distance between the refractive light bar and the adjacent reflective light bar is B, and A>B.

[0011] Optionally, the distance between adjacent light bars in the first light-emitting area is C, the distance between adjacent light bars in the second light-emitting area is D, and C<D.

[0012] Optionally, the light bar includes a plurality of light-emitting elements;

[0013] In the refractive light bar in the first light-emitting area, the distance between the light-emitting elements at both ends and their adjacent light-emitting elements is E, and the distance between any adjacent light-emitting elements other than the light-emitting elements at both ends is F, and E>F.

[0014] Optionally, in the refractive light strip in the first light-emitting area, the light-emitting elements at both ends are respectively a first light-emitting element and a second light-emitting element, the first light-emitting element is located at the first corner of the backlight module, the second light-emitting element is located at the second corner of the backlight module, the distance between the first light-emitting element and the first corner is G, the distance between the second light-emitting element and the second corner is H, and the value range of G and H is 80-140mm.

[0015] Optionally, the backlight module further includes at least one optical film, which is located on a side of the light source away from the light-emitting element, and a portion of each optical film located in the first light-emitting area protrudes toward the light-emitting side of the backlight module.

[0016] Optionally, the light bar includes a plurality of light-emitting elements;

[0017] In the reflective light bar, the light-emitting element includes an LED lamp and a reflector located on the light-emitting side of the LED lamp, and the reflective surface of the reflector is a plane.

[0018] In a second aspect, an embodiment of the present invention further provides a display device, comprising the backlight module, a rear housing and electronic materials as described in the first aspect;

[0019] The rear shell is located at a side of the backlight module away from the light emitting side thereof, an accommodation space is formed between the back plate in the first light emitting area and the rear shell, and the electronic material is arranged in the accommodation space.

[0020] The backlight module provided by the embodiment of the present invention includes a back panel and a light source located on the back panel near the light emitting side of the backlight module. The backlight module includes a first light-emitting area and a second light-emitting area. The back panel in the first light-emitting area protrudes toward the light emitting side of the backlight module. In the same backlight cavity, two different optical lenses are used in the first light-emitting area and the second light-emitting area to form an ultra-thin cavity, which reduces the thickness of the whole machine, utilizes the saved space to accommodate electronic components, makes the rear shell of the whole machine and the back panel at the same height, and achieves an overall consistent appearance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Other features, objects and advantages of the present invention will become more apparent from the detailed description of non-limiting embodiments made with reference to the following drawings:

[0022] Figure 1 A schematic structural diagram of a backlight module provided by an embodiment of the present invention;

[0023] Figure 2 A schematic diagram of light propagation principle of a first light-emitting area in a backlight module provided by an embodiment of the present invention;

[0024] Figure 3 A schematic diagram of light propagation principle of a second light-emitting area in a backlight module provided by an embodiment of the present invention;

[0025] Figure 4 A schematic diagram of the structure of a backlight module provided by an embodiment of the present invention;

[0026] Figure 5 A schematic diagram of another light propagation provided by an embodiment of the present invention;

[0027] Figure 6 A schematic diagram of the structure of a display device provided by an embodiment of the present invention;

[0028] Figure 7 The embodiment of the present invention provides Figure 6 Schematic diagram of the cross section divided by line AB. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical solution and advantages of the present invention clearer, the specific embodiments of the present invention are further described in detail below in conjunction with the accompanying drawings. It should be understood that the specific embodiments described here are only used to explain the present invention, rather than to limit the present invention.

[0030] It should also be noted that, for the convenience of description, the drawings only show the parts related to the present invention rather than all the contents.

[0031] Figure 1 A schematic diagram of the structure of a backlight module provided by an embodiment of the present invention. Figure 1 As shown, the backlight module includes a back plate 110 and a light source 140 located on the back plate 110 near the light emitting side of the backlight module. The backlight module includes a first light emitting area 130 and a second light emitting area 120. The back plate 110 in the first light emitting area 130 protrudes toward the light emitting side of the backlight module.

[0032] Among them, the backlight module is the provider of the light source of the liquid crystal display. Since the liquid crystal itself does not emit light, the performance of the light source of the backlight module determines the visual sense of the display. The backlight module can be divided into two types: front light and backlight. The backlight method can be classified according to the requirements of its scale and the position of the light source, and can be divided into side light, direct type and center control type. In this embodiment, the backlight method selects a direct backlight module. In order to achieve an ultra-thin direct backlight module, it is necessary to reduce the mixing distance in the backlight module. Among them, the mixing distance is the distance from the bottom reflector or light source to the film material in the direct backlight module.

[0033] Specifically, the light mixing distances of the first light emitting area 130 and the second light emitting area 120 in the backlight module are different. FIG2 is a schematic diagram of the light propagation principle of the first light emitting area in a backlight module provided by an embodiment of the present invention. Figure 2 As shown, in the first light emitting area 130, the light mixing distance is L1, and when light is emitted by the light source on the light emitting side of the backlight module, the light spot area is K1. Figure 3 The following is a schematic diagram of the light propagation principle of the second light-emitting area in a backlight module provided by an embodiment of the present invention. Figure 3 As shown, in the second light-emitting area 120, the light mixing distance is L2, and when the light source on the light-emitting side of the backlight module is used to emit light, the spot area is K2. In this embodiment, the light mixing distance L1 of the first light-emitting area 130 can be in the range of 23mm-10mm, and the light mixing distance L2 of the second light-emitting area 120 can be in the range of 25mm-40mm. In order to ensure that the light extraction efficiency of the first light-emitting area 130 and the second light-emitting area 120 is consistent in the same backlight module, K1 needs to be set to be approximately equal to K2.

[0034] It should be noted that the back panel in the first light-emitting area 130 in the backlight module is raised toward the light-emitting side of the backlight module, and the mixed light distance L1 of the first light-emitting area 130 is smaller than the mixed light distance L2 of the second light-emitting area 120, so that the first light-emitting area 130 with a smaller mixed light distance than the second light-emitting area 120 forms a space for accommodating electronic materials such as the main board and power supply. Thus, the main board, power supply and other electronic materials are arranged as a whole with the backlight module to form a complete machine state, so that the height of the rear shell and the back panel of the whole machine are kept flush, thereby effectively reducing the thickness of the whole machine.

[0035] The backlight module provided in this embodiment includes a back panel and a light source located on the back panel near the light emitting side of the backlight module. The backlight module includes a first light-emitting area and a second light-emitting area. The back panel in the first light-emitting area protrudes toward the light emitting side of the backlight module. The mixed light distance of the first light-emitting area is smaller than the mixed light distance of the second light-emitting area, so that the first light-emitting area with a smaller mixed light distance than the second light-emitting area forms a space for accommodating electronic materials such as a mainboard and a power supply. In this way, the mainboard, power supply and other electronic materials are arranged as a whole with the backlight module to form a complete machine state, so that the height of the rear shell of the whole machine and the back panel are kept flush, thereby effectively reducing the thickness of the whole machine and achieving an overall consistent appearance.

[0036] Optional, Figure 4 A schematic diagram of the structure of a backlight module provided by an embodiment of the present invention. Figure 4 As shown, the light source includes a plurality of light bars, the light bars in the first light emitting area 130 are reflective light bars, and the light bars in the second light emitting area 120 are refractive light bars.

[0037] The light sources of the first light-emitting area 130 and the second light-emitting area 120 are located on the light-emitting side of the back panel 110 close to the entire backlight module. In the first light-emitting area 130, a reflective light bar is used as a light source, and the light emitted by the light bar is optically opened for a second time by using the principle of its reflective lens, and the light directly acts on the reflector. In the second light-emitting area 120, a refractive light bar is used as a light source, and the light emitted by the light bar is optically opened for a second time, and the light does not act on the reflective sheet, but is directly emitted through the lens.

[0038] It should be noted that, in the present embodiment, a plurality of light-emitting units are provided on each light bar, and each light-emitting unit can be an LED lamp, and the LED lamp can be assembled on a flexible circuit board or a PCB hard board. The light bar 140 combines two different optical lenses to perform secondary optical opening of the light emitted by the LED lamp. For example, in the first light-emitting area 130, a reflective lens is covered on each LED lamp on the light bar, and the light is emitted by using the reflective lens principle. In the second light-emitting area 120, a refractive lens is covered on each LED lamp on the light bar, and the light is emitted by using the refractive principle. In addition, in the present embodiment, the number of LED lamps on each light bar is set by the designer according to different lighting requirements, and is not limited here.

[0039] Optional, continue to refer to Figure 4 The light bar extends along a first direction x, and the first direction x is perpendicular to the arrangement direction y of the first light-emitting area 130 and the second light-emitting area 120. The first light-emitting area 130 also includes a refractive light bar 1411, which is located on the side of the reflective light bar 1412 in the first light-emitting area 130 away from the second light-emitting area 120.

[0040] Among them, the refractive light bar 1411 is arranged in the first light-emitting area 130, which can effectively reduce the amount of light directly acting on the inclined surface of the reflector.

[0041] Specifically, the refractive light bar 1411 is used to control the opening angle of the light to become smaller, so that the number of emitted light rays becomes less, thereby avoiding the light spot phenomenon caused by light accumulation due to too much light gathering on the inclined surface of the reflector.

[0042] It should be noted that since the first light-emitting area 130 uses the principle of reflective lens to open the light for a second time, the refractive light bar 1411 needs to be set on the outermost slope of the first light-emitting area 130 close to the reflector. When the reflective light bar 1412 in the first light-emitting area 130 except the refractive light bar 1411 emits light, the accumulation of light gathered on the inclined surface of the reflector is effectively reduced.

[0043] Optional, continue to refer to Figure 4 The distance between the adjacent light bars in the first light-emitting area 130 and the second light-emitting area 120 is A, and the distance between the refractive light bar 1411 and the adjacent reflective light bar 1412 in the first light-emitting area 130 is B, and A>B.

[0044] Among them, in the first light-emitting area 130, the distance B between the refractive light bar 1411 and the adjacent reflective light bar 1412 is smaller than the distance A between the adjacent light bars arranged in the first light-emitting area 130 and the second light-emitting area 120. Since the mixed light distance of the first light-emitting area 130 is smaller than the mixed light distance of the second light-emitting area 120, in order to improve the problem of insufficient light angle of the refractive light bar caused by the short mixed light distance of the first light-emitting area 130, the spacing between the reflective light bar 1412 and the refractive light bar 1411 in the first light-emitting area 130 is reduced, thereby obtaining a uniform display picture.

[0045] Optional, continue to refer to Figure 4 , the distance between adjacent light bars in the first light-emitting area is C, the distance between adjacent light bars in the second light-emitting area is D, and C<D.

[0046] Among them, refer to Figure 4 Since the second optical zone 120 is illuminated by a refractive lens with the same light-emitting principle, each light bar in the second optical zone 120 extends along the horizontal direction x and is arranged along the vertical direction y, wherein each light bar is equidistantly arranged along the vertical direction y.

[0047] Similarly, since the mixing distance of the first light-emitting area 130 is shorter, on the basis of setting the refractive light bar 1411 in the first light-emitting area 130, shortening the distance between the refractive light bar 1411 and the reflective light bar 1412 in the first light-emitting area 130 can effectively improve the poor appearance of light and dark bands around the backlight caused by the reflective light bar 1412.

[0048] Optional, continue to refer to Figure 4 The light bar includes multiple light-emitting elements 1413. In the refractive light bar 1411 in the first light-emitting area 130, the distance between the light-emitting elements located at both ends and their adjacent light-emitting elements is E. Among the light-emitting elements other than the light-emitting elements located at both ends, the distance between any adjacent light-emitting elements is F, and E>F.

[0049] Among them, the backlight cavity is composed of the back panel 110, the first light-emitting area 130 and the second light-emitting area 120, and the first light-emitting area 130 has a shorter mixed light distance than the second light-emitting area 120. The refractive light bar 1411 of the first light-emitting area 130 is arranged close to the edge of the first light-emitting area 130. When the LED lamp is arranged on the refractive light bar 1411, in order to ensure that the short mixed light distance light-emitting area of ​​the entire backlight cavity emits uniform light, the LED lamps at the two ends of the refractive light bar 1411 are as close to the corners of the backlight cavity as possible, so that the distance from the two ends of the LED lamp to the LED lamp adjacent to the two ends is greater than the distance between every two middle LED lamps, so that there will be no dark corner phenomenon at the corner of the backlight cavity, and the uneven light emission of the first light-emitting area 130 is avoided.

[0050] Optional, continue to refer to Figure 4 In the refractive light bar 1411 in the first light-emitting area 130, the light-emitting elements located at both ends are respectively the first light-emitting element 1414 and the second light-emitting element 1415. The first light-emitting element 1414 is located at the first corner 150 of the backlight module, and the second light-emitting element 1415 is located at the second corner 151 of the backlight module. The distance 150 between the first light-emitting element 1414 and the first corner is G, and the distance between the second light-emitting element 1415 and the second corner 151 is H. The value range of G and H is 80-140mm.

[0051] Specifically, on the basis of the above embodiments, in order to avoid the dark corner phenomenon at the corners of the backlight cavity, the first light-emitting element 150 and the second light-emitting element 151 are arranged at the two ends of the refractive light bar 1411 in the first light-emitting area 130, so that the first light-emitting element 150 and the second light-emitting element 151 are kept at a longer distance from the remaining light-emitting units located in the middle of the refractive light bar 1411. In order to limit the distance between the first light-emitting element 1414 and the second light-emitting element 1415 and the corners of the backlight cavity to avoid the occurrence of the dark corner phenomenon, the designer can set the distance between the first light-emitting unit 1414 and the first corner 150 of the backlight module to between 80-140 mm. Similarly, the distance between the second light-emitting unit 1415 and the second corner 151 of the backlight module is set to between 80-140 mm. The dark corner distance in the backlight cavity can be adjusted within this range.

[0052] For example, in the first light-emitting area 130, if the number of inclined surfaces of the reflector sheet acted upon by the emitted light is large, and the angle of the light opened by the refractive light bar 1411 in the first light-emitting area 130 is large, causing the light-dark band and dark corner phenomenon, then the dark corner distances G and H in the first light-emitting area 130 can be adjusted. The dark corner distances G and H are shortened so that the first light-emitting unit 1414 and the second light-emitting unit 1415 on the refractive light bar 1411 in the first light-emitting area 130 are as close to the corner of the backlight module as possible to eliminate the dark corner phenomenon.

[0053] Optionally, the backlight module further comprises at least one optical film, which is located on a side of the light source away from the light-emitting element, and a portion of each optical film located in the first light-emitting area protrudes toward the light-emitting side of the backlight module.

[0054] Specifically, based on the above embodiment, since the back plate in the first light-emitting area of ​​the backlight module is raised toward the light-emitting side of the backlight module, in order to achieve the display effect, at least one optical film needs to be provided in the backlight module on one side of the light-emitting element of the light source principle. During the manufacturing process, the part of the optical film located in the first light-emitting area is also raised toward the light-emitting side of the backlight module, which is conducive to the integrated forming of the backlight module and simplifies the manufacturing process of the backlight module.

[0055] Optionally, the light bar includes a plurality of light-emitting elements. In a reflective light bar, the light-emitting elements include an LED lamp and a reflector located on the light-emitting side of the LED lamp, and the reflective surface of the reflector is a plane.

[0056] The light emitted by the reflective light bar in the first light-emitting area will form light accumulation around the reflector, thereby presenting an obvious light spot.

[0057] It should be noted that, in order to solve the above problems, the traditional measure is to make the naturally bent reflector smooth in transition to reduce light accumulation. In addition, screen printing technology or punching technology is used to add silk screen ink dots and light absorption holes on the reflective surface of the reflector to dilute and adjust the fiber accumulation, thereby partially improving the appearance of light and dark bands and dark corners. However, the smooth transition of the naturally bent reflector will be unevenly stressed, and there will be large internal stress after bending. The temperature and humidity of the environment and the stress on the backlight cavity will easily cause the reflector to deform, resulting in optical uneven reflection, causing bright spots and other phenomena, thereby reducing the display yield.

[0058] Specifically, Figure 5 Another schematic diagram of light propagation provided by an embodiment of the present invention. Figure 5As shown, in the present embodiment, in order to solve the above-mentioned problem, a refractive light bar is used as the light bar near the outermost edge of the reflector in the first light-emitting area 130, and the reflective surface 160 of the reflector can be set as a pre-bent plane to ensure that the shape of the reflector will not change after bending, thereby improving the bright spot phenomenon caused by the uneven force formed by the natural transition of the reflective light bar reflector.

[0059] Figure 6 A schematic structural diagram of a display device provided by an embodiment of the present invention. Figure 7 The embodiment of the present invention provides Figure 6 Schematic diagram of the cross section divided by line AB. Figure 7 As shown, the display device includes the backlight module 100, the rear shell 180 and the electronic material 190 provided in the above embodiment. The rear shell 180 is located on the side of the backlight module 100 away from its light emitting side. An accommodating space P is formed between the back panel in the first light-emitting area 130 and the rear shell 180, and the electronic material 190 is arranged in the accommodating space P.

[0060] Specifically, on the basis of the above embodiment, the back panel in the first light-emitting area 130 of the backlight module 100 is arranged to protrude toward the light-emitting side of the backlight module 100, and the mixed light distance of the first light-emitting area 130 is smaller than the mixed light distance of the second light-emitting area 120, so that the first light-emitting area 130 with a smaller mixed light distance than the second light-emitting area 120 forms an accommodating space P, and the accommodating space P is used to accommodate electronic materials such as a main board and a power supply. The rear shell 180 is located on one side of the light-emitting side of the backlight module 100, so that the height of the rear shell 180 of the whole machine and the back panel are kept flush. In this way, the main board, power supply and other electronic materials are arranged as a whole with the backlight module to form a whole machine state, which effectively reduces the thickness of the whole machine.

[0061] Note that the above are only preferred embodiments of the present invention and the technical principles used. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments, and may include more other equivalent embodiments without departing from the concept of the present invention, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A backlight module, characterized in that: It includes a back plate and a light source located on the back plate near the light emitting side of the backlight module; The backlight module comprises a first light-emitting area and a second light-emitting area, and the back plate in the first light-emitting area protrudes toward the light-emitting side of the backlight module; The light source includes a plurality of light bars, the light bars in the first light emitting area are reflective light bars, and the light bars in the second light emitting area are refractive light bars; The light bar extends along a first direction, and the first direction is perpendicular to an arrangement direction of the first light-emitting area and the second light-emitting area; The first light-emitting area further comprises a refractive light bar, and the refractive light bar is located on a side of the reflective light bar in the first light-emitting area away from the second light-emitting area; The light bar includes a plurality of light emitting elements; The backlight module further comprises at least one optical film, which is located on a side of the light source away from the light-emitting element, and a portion of each optical film located in the first light-emitting area protrudes toward a light-emitting side of the backlight module.

2. The backlight module according to claim 1, characterized in that: The distance between the adjacent light bars in the first light-emitting area and the second light-emitting area is A, and in the first light-emitting area, the distance between the refractive light bar and the adjacent reflective light bar is B, and A>B.

3. The backlight module according to claim 1, characterized in that: The distance between adjacent light bars in the first light-emitting area is C, and the distance between adjacent light bars in the second light-emitting area is D, where C<D.

4. The backlight module according to claim 1, characterized in that: In the refractive light bar in the first light-emitting area, the distance between the light-emitting elements at both ends and their adjacent light-emitting elements is E, and the distance between any adjacent light-emitting elements other than the light-emitting elements at both ends is F, and E>F.

5. The backlight module according to claim 4, characterized in that: In the refractive light strip in the first light-emitting area, the light-emitting elements located at both ends are respectively a first light-emitting element and a second light-emitting element, the first light-emitting element is located at a first corner of the backlight module, the second light-emitting element is located at a second corner of the backlight module, the distance between the first light-emitting element and the first corner is G, the distance between the second light-emitting element and the second corner is H, and the value range of G and H is 80-140mm.

6. The backlight module according to claim 1, characterized in that: The light bar includes a plurality of light emitting elements; In the reflective light bar, the light-emitting element includes an LED lamp and a reflector located on the light-emitting side of the LED lamp, and the reflective surface of the reflector is a plane.

7. A display device, characterized in that: Comprising the backlight module, rear housing and electronic materials as described in any one of claims 1 to 6; The rear shell is located at a side of the backlight module away from the light emitting side thereof, an accommodation space is formed between the back plate in the first light emitting area and the rear shell, and the electronic material is arranged in the accommodation space.

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