CN210627725U - Backlight module and display device - Google Patents
Backlight module and display device Download PDFInfo
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- CN210627725U CN210627725U CN202020006801.XU CN202020006801U CN210627725U CN 210627725 U CN210627725 U CN 210627725U CN 202020006801 U CN202020006801 U CN 202020006801U CN 210627725 U CN210627725 U CN 210627725U
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Abstract
The utility model relates to a show technical field, disclose a backlight unit and display device, backlight unit includes: a light guide plate having a first side surface; the light guide plate is also provided with a first area extending along the length direction of the first side surface and a second area arranged on one side of the first area, which is far away from the first side surface; the light guide plate is arranged on the first side surface, and the light emitting direction of each first light source faces the light guide plate; the at least one second light source is arranged at least one end of the first side surface along the length direction of the first side surface, and the light emitting direction faces the light guide plate, so that the light path of the second light source covers at least part of blind areas in the first area, and the phenomenon of light and dark interval distribution at the edge of the light incident side of the light guide plate is relieved.
Description
Technical Field
The utility model relates to a show technical field, in particular to backlight module and display device.
Background
In a display device, a backlight source is provided for a display panel through a backlight module, the backlight module generally comprises a light guide plate, a light bar, an optical film material and the like, the light bar is arranged along the side edge of the light guide plate, and a plurality of LED lamps distributed at intervals are arranged in the light bar to provide a light source from the light incident side of the light guide plate; however, due to the spaced arrangement of the LED lamps, a phenomenon of bright and dark spaces (i.e., hotspot phenomenon) inevitably occurs in the light guide plate, which causes non-uniform backlight of the display panel and affects the display effect.
As shown in fig. 1, the display device includes a display panel and a backlight module, a light guide plate in the backlight module is located on one side of the display panel away from a light exit surface, the display panel has a display area 1 and a non-display area blocked by a frame 2, a plurality of LED lamps 3 in the backlight module are distributed at intervals along an extending direction of the frame 2, a side light source is provided for the light guide plate on a side surface of the light guide plate, each LED lamp 3 has a horn-shaped light path 4, a dark blind area 5 is formed in an area between the light paths 4 of every two LED lamps 3 and an area between the LED lamps at the left and right edges and a boundary of the display panel because the area cannot be covered by the light paths 4, and a phenomenon of light and dark interval distribution (i.e. hotspot phenomenon) is also formed along the extending direction of the frame 2; in the prior art, in order to eliminate the hotspot phenomenon, the width of the frame 2 is increased, so that a narrow frame cannot be realized, or the distribution density of the LED lamps 3 is increased, but the blind area 5 can only be reduced, but cannot be completely eliminated.
SUMMERY OF THE UTILITY MODEL
The utility model discloses a backlight module and display device for alleviate the phenomenon that the light guide plate goes into light side edge bright and dark interval distribution.
In order to achieve the above purpose, the utility model provides the following technical scheme:
a backlight module includes:
a light guide plate having a first side surface; the light guide plate is also provided with a first area extending along the length direction of the first side surface and a second area arranged on one side of the first area, which is far away from the first side surface;
the plurality of first light sources are distributed at intervals along the length direction of the first side face, and the light emitting direction of each first light source faces the light guide plate, wherein dead zones among light paths of the plurality of first light sources are all located in the first zones;
at least one second light source is arranged at least one end of the first side surface along the length direction of the first side surface, and the light emitting direction faces the light guide plate, so that the light path of the second light source covers at least part of the blind area in the first area.
Optionally, at least one second light source is respectively disposed at two opposite ends of the first side surface along the length direction of the first side surface.
Alternatively, when a plurality of second light sources are respectively disposed at each of opposite ends of the first side surface, the plurality of second light sources are arranged along a length direction of the disposed side surface on the light guide plate.
Optionally, the light guide plate further has a second side surface and a third side surface, and the second side surface and the third side surface are respectively located on two sides of the first side surface in the length direction and are oppositely arranged;
in the second region, the density of the mesh points on the light guide plate is gradually reduced from the middle position of the light guide plate to the second side surface and the third side surface along the length direction of the first side surface.
Optionally, in the second region, along the length direction of the first side surface, the density of the dots at the middle position of the light guide plate is 1.5 times to 4.5 times that at the edge of the second side surface, and is 1.5 times to 4.5 times that at the edge of the third side surface.
Optionally, in the first region, the dot density of the light guide plate in a dead zone between the light paths of every two first light sources is greater than the dot density of the light guide plate in the light path of every first light source.
Optionally, the light guide plate further has a second side surface and a third side surface, and the second side surface and the third side surface are respectively located on two sides of the first side surface in the length direction and are oppositely arranged;
one edge of the light path of each second light source extends along the first side face.
Optionally, another edge of the optical path of the second light source close to the second side surface extends along the second side surface;
another edge of the light path of the second light source close to the third side extends along said third side.
Optionally, a corner cutting surface is formed between the first side surface and the second side surface, and another corner cutting surface is formed between the first side surface and the third side surface;
and the light emergent surface of each second light source is arranged along the corresponding corner cutting surface.
Optionally, each corner cut surface is planar.
Optionally, in the thickness direction of the light guide plate, a distance between each of the two opposite side surfaces of the first light source and a plane of the corresponding side surface of the light guide plate is greater than or equal to 0.6mm, and a distance between each of the two opposite side surfaces of the second light source and the plane of the corresponding side surface of the light guide plate is greater than or equal to 0.6 mm.
Optionally, the light guide plate further has a fourth side surface disposed opposite to the first side surface.
In the above backlight module, a plurality of first light sources are distributed along the first side interval of light guide plate, at least, can form the blind area between the light path of every two adjacent first light sources, and because the blind area between the light path of a plurality of first light sources all is located first region, and at least one second light source sets up in the at least one end of first side, and the light-emitting direction is towards the light guide plate, the blind area that the light path of second light source covers the light path formation of at least some first light sources in the first region, thereby, alleviate the phenomenon of bright dark interval distribution at light guide plate income light side edge.
A display device comprises the backlight module.
The advantages of the display device and the display device are the same as those of the display device in the prior art, and are not described herein again.
Drawings
FIG. 1 is a schematic diagram of a prior art display device;
fig. 2 is a schematic view of a backlight module according to an embodiment of the present disclosure;
fig. 3 is a schematic view illustrating a first light source and a light guide plate of a backlight module according to an embodiment of the present disclosure;
fig. 4 is a schematic view of a light bar in a backlight module provided in the embodiment of the present application;
fig. 5 is a schematic view of a display device according to an embodiment of the present application.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
Referring to fig. 2, a backlight module provided in an embodiment of the present application includes:
a light guide plate 10 having a first side 11, a second side 12, a third side 13, and a fourth side 14, wherein the first side 11 and the fourth side 14 are disposed opposite to each other, and the second side 12 and the third side 13 are disposed opposite to each other; the light guide plate 10 further has a first region S1 extending along the length direction of the first side surface 11, and a second region S2 disposed on a side of the first region S1 facing away from the first side surface 11, for example, referring to fig. 2, a dashed line M is used as a boundary, a first region S1 is located between the first side surface 11 and the dashed line M, and a second region S2 is located between the second side surface 12 and the dashed line M;
a plurality of first light sources 31, the plurality of first light sources 31 being distributed at intervals along the length direction of the first side surface 11, and the light emitting direction of each first light source 31 facing the light guide plate 10, wherein the blind areas 21 between the light paths 22 of the plurality of first light sources 31 are all located in the first area S1;
at least one second light source 32, disposed at least one end of the first side surface 11 along the length direction of the first side surface 11, and emitting light toward the light guide plate 10, so that the light path 23 of the second light source 32 covers the dead zone 21 formed by at least part of the light path 22 of the first light source 31 in the first area S1; for example, the light path 23 of the second light source 32 may cover all the blind areas 21 in the first area S1 to completely eliminate the blind areas 21, or cover only a part of the blind areas 21 to reduce the light-dark intervals at the corresponding edges of the first side 11 to some extent.
It should be noted that the backlight module may further include an optical film material, a reflective sheet, and other components commonly used in the backlight module, wherein the optical film material is disposed on the light-emitting surface of the light guide plate 10, and the reflective sheet is disposed on a side of the light guide plate away from the light-emitting surface.
In the backlight module, the plurality of first light sources 31 are spaced along the length direction of the first side surface 11 of the light guide plate 10, at least a blind area 21 is formed between the light paths 22 of every two adjacent first light sources 31, and since the blind areas 21 between the light paths 22 of the plurality of first light sources 31 are all located in the first area S1, and at least one second light source 32 is disposed at least one end of the first side surface 11, and the light emitting direction faces the light guide plate 10, the light path 23 of the second light source 32 covers at least a part of the blind area 21 in the first area S1, therefore, the blind area 21 that cannot be covered by the light path 22 of the first light source 31 in the first area S1 can be effectively covered by the light path 23 of the second light source 32, and the phenomenon of light and dark spacing distribution at the light incident side edge of the light guide plate 10 is.
In a specific embodiment, referring to fig. 2, along the length direction of the first side surface 11, two opposite ends of the first side surface 11 are respectively provided with one second light source 32, so that light is incident on both left and right sides of the light guide plate 10, so that the brightness distribution of both left and right sides of the light guide plate 10 is close, and the blind areas 21 on both left and right sides can be compensated by the same intensity, however, the two opposite ends of the first side surface 11 are not limited to only one second light source 32 at each end, and two or more second light sources 32 may be respectively provided, as long as it is ensured that at least one second light source 32 is respectively provided at the two opposite ends of the first side surface 11. When a plurality of (i.e., two or more) second light sources 32 are disposed at each end of the first side surface, the plurality of second light sources 32 may be distributed along the thickness direction of the light guide plate 10 (i.e., the plurality of second light sources 32 are disposed in parallel), or may be disposed at intervals along the length direction of the second side surface 12 (or the third side surface 13), and the second side surface 12 (or the third side surface 13) is the disposed side surface of the plurality of second light sources 32 on the light guide plate 10, at this time, when the plurality of second light sources 32 are disposed at intervals along the length direction of the second side surface 12 (or the third side surface 13), the light path 23 of the second light source 32 can fully cover the dead zone 21, and the luminance distribution at each position of the light guide plate 10 is more uniform, thereby improving the display effect.
In a specific embodiment, in the second region S2, the density of the dots on the light guide plate 10 gradually decreases from the middle of the light guide plate 10 to the second side 12 and the third side 13 along the length direction of the first side 11. As shown in fig. 2, the density of the dots on the light guide plate 10 gradually decreases from the center line L of the light guide plate 10 to the second side 12 along the direction a, and the density of the dots on the light guide plate 10 gradually decreases from the center line L of the light guide plate 10 to the third side 13 along the direction B. Thus, the second light sources 32 are respectively disposed at the end of the first side surface 11 close to the second side surface 12 and the end close to the third side surface 13, so that the central line L of the light guide plate 10 is closer to the second light sources 32 along the direction a to the second side surface 12 and along the direction B to the third side surface 13, the light intensity is higher, fewer dots are disposed at the position with higher light intensity on the light guide plate 10, and more dots are disposed at the position with lower light intensity, which is beneficial to the uniformity of light output from the light output surface of the light guide plate 10 to the display panel in the range of the second region S2 of the light output surface.
Specifically, in the second region S2, along the length direction of the first side 11, the density of the dots at the middle position of the light guide plate 10 is 1.5 times to 4.5 times, for example, 1.5 times, 1.7 times, 2 times, 2.5 times, 3 times, 3.8 times or 4.5 times, of the density of the dots near the edge region of the second side 12, otherwise, it is difficult to ensure uniform light emission everywhere in the second region S2 of the light guide plate 10. Similarly, the density of the dots at the middle position of the light guide plate 10 is 1.5 times to 4.5 times that of the dots at the edge area near the third side 13.
In another specific embodiment, in the first region S1, the density of the dots of the light guide plate 10 located in the blind area 21 of the light path 22 of the first light sources 31 is greater than the density of the dots of the light guide plate 10 located in the light path 22 of each first light source 31, so that the light is uniformly emitted throughout the first region S1 of the light guide plate 10.
In a specific embodiment, referring to fig. 2, an edge of the light path 23 of each second light source 32 extends along the first side surface 11 to ensure that the light path 23 does not irradiate the outside of the light guide plate 10, which results in low light source utilization rate, and at the same time, to ensure that the first area S1 of the light guide plate 10 is covered by the light path 23 of the second light source 32 everywhere, so as to avoid the light path 23 not covering the blind area 21 in the first area S1 well.
Similarly, the other edge of the optical path 23 of the second light source 32, which is close to the second side 12, extends along the second side 12; the other edge of the light path 23 of the second light source 32 close to the third side surface 13 extends along the third side surface 13, so as to ensure that the light path 23 of the second light source 32 does not emit outside the light guide plate 10, which results in low light source utilization rate, and ensure that the light path 23 of the second light source 32 fully covers the edge area of the light guide plate 10 close to the second side surface 12 and the edge area of the light guide plate 10 close to the third side surface 13, which is beneficial to uniform light emission at the edge of the second side surface 12 and the edge of the third side surface 13 of the light guide plate 10.
In order to make the edge of the light path 23 of the second light source 32 extend along the first side 11, the second side 12 and the third side 13 as much as possible, one corner cut surface 15 is formed between the first side 11 and the second side 12, and another corner cut surface 16 is formed between the first side 11 and the third side 13; the light emitting surface of each second light source 32 is arranged along the corresponding corner cut surface, that is, the light emitting surface of the second light source 32 close to the second side surface 12 is arranged along the corner cut surface 15, and the light emitting surface of the second light source 32 close to the third side surface 13 is arranged along the corner cut surface 16; for example, the included angle between the tangential plane 15 and the first side surface 11 is equal to the included angle between the tangential plane 15 and the second side surface 12 (denoted as an included angle a), and the included angle between each edge of the light path 23 of the second light source 32 and the light emitting surface of the second light source 32 is an included angle b, and when the included angle a is equal to the included angle b (for example, the included angle a and the included angle b are both 120 °), the edge of the light path 23 of the second light source 32 can extend along the first side surface 11, the second side surface 12, and the third side surface 13 as far as possible.
The chamfer surface 15 and the chamfer surface 16 may be flat surfaces or curved surfaces, and when the chamfer surface 15 and the chamfer surface 16 are flat surfaces, the light emitting surfaces of the corresponding second light sources 32 are attached to each other, so that light leakage is prevented.
In order to adapt to the design of the above-mentioned chamfer 15 and chamfer 16, the light bar of the backlight module is modified accordingly, as shown in fig. 3, the light bar includes a light bar body for routing and supporting (supporting the first light source 31 and the second light source 32), the light bar body includes a first segment 33a, a second segment 33b and a third segment 33c, wherein the second segment 33b is connected to one end of the first segment 33a, the third segment 33c is connected to the other end of the first segment 33a, and both the second segment 33b and the third segment 33c are bent toward the light guide plate 10 relative to the first segment 33a to form a concave structure, while the first segment 33a is disposed along the first side surface 11, the second segment 33b is disposed along the chamfer 15, and the third segment 33c is disposed along the chamfer 16. The light bar body, the first light source 31 and the second light source 32 together form a light bar.
In addition, when a plurality of (i.e., two or more) second light sources 32 are disposed at each end of the first side surface 11, the plurality of second light sources 32 may be distributed along the thickness direction of the light guide plate 10 on the corner cutting surface 15 (or the corner cutting surface 16) (i.e., the plurality of second light sources 32 are disposed in parallel), or may be disposed at intervals along the length direction of the corner cutting surface 15 (or the corner cutting surface 16), and the corner cutting surface 15 (or the corner cutting surface 16) is the side surface on which the plurality of second light sources 32 are disposed on the light guide plate 10, in this case, when the plurality of second light sources 32 are disposed at intervals along the length direction of the corner cutting surface 15 (or the corner cutting surface 16), the light path 23 of the second light source 32 can sufficiently cover the dead zone 21, and the luminance distribution at each position of the light guide plate 10 is more uniform, thereby improving the display effect.
In order to avoid the light emitted by the first light source 31 and the second light source 32 from being emitted to the outside of the light guide plate 10, the dimension of the light guide plate 10 in the thickness direction is respectively greater than the dimension of the first light source 31 and the dimension of the second light source 32 in the thickness direction of the light guide plate 10, wherein the distance between each of two opposite side surfaces of the first light source 31 and the plane where the corresponding side surface of the light guide plate 10 is greater than or equal to 0.6mm, and the distance between each of two opposite side surfaces of the second light source 32 and the plane where the corresponding side surface of the light guide plate 10 is located is greater than or equal to 0.6 mm. Taking the first light source 31 as an example, referring to fig. 4, a distance between a top surface Q of the first light source 31 and a plane where the light emitting surface T of the light guide plate 10 is located is greater than or equal to 0.6mm, for example, 0.06mm, 0.08mm, or 0.09mm, and similarly, the bottom surface of the first light source 31 and a surface of the light guide plate 10 away from the light emitting surface T also satisfy the above requirements, and the arrangement of the second light source 32 refers to the arrangement of the first light source 31. In addition, in order to further avoid light leakage, the light emitting surfaces of the first light source 31 and the second light source 32 are directly attached to the light incident surface of the light guide plate 10.
It should be noted that the fourth side surface 14 of the light guide plate 10 may be replaced by other types of side surfaces, for example, two or more side surfaces connected in sequence, or a curved surface, which may be determined according to the shape of the display panel used with the light guide plate backlight module.
As described above, the light path 22 of the first light source 31 refers to a projection of the light radiation area of the first light source 31 in the thickness direction of the light guide plate 10, the projection is in a fan shape, and two straight edges of the fan-shaped area are boundaries on two sides of the light path 22 in the extending direction. The definition of the light path 23 of the second light source 32 is similar to the definition of the light path 22.
Based on the same inventive concept, the embodiment of the application further provides a display device, which comprises the backlight module provided by the embodiment.
Exemplarily, as shown in fig. 5, the display device further includes a display panel 60 and a frame 70, the display panel 60 is disposed on a light-emitting surface of the light guide plate 10 in the backlight module to obtain backlight from the light guide plate 10, and the frame 70 is disposed along the first side surface 11 and covers a partial area of the display panel 60.
In the display device, the plurality of first light sources 31 are spaced along the first side surface 11 of the light guide plate 10, at least a blind area 21 is formed between the light paths 22 of every two adjacent first light sources 31, and since the blind areas 21 between the light paths 22 of the plurality of first light sources 31 are all located in the first area S1, and at least one second light source 32 is disposed at least one end of the first side surface 11, and the light emitting direction faces the light guide plate 10, the light path 23 of the second light source 32 covers the first area S1, the blind area 21 that cannot be covered by the light path 22 of the first light source 31 in the first area S1 can be effectively covered by the light path 23 of the second light source 32, and the phenomenon of light and dark spacing distribution at the edge of the light incident side of the light guide plate 10 is alleviated.
Moreover, as can be seen from fig. 5, the light and dark spacing phenomenon (hotspot phenomenon) along the first side surface 11 of the light guide plate 10 can be alleviated or even eliminated without widening the frame 70 and without providing the first light sources 31 with an excessive density, and at the same time, the narrow frame is facilitated, the number of the first light sources 31 is saved, and the cost is reduced.
It will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments of the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (13)
1. A backlight module, comprising:
a light guide plate having a first side surface; the light guide plate is also provided with a first area extending along the length direction of the first side surface and a second area arranged on one side of the first area, which is far away from the first side surface;
the plurality of first light sources are distributed at intervals along the length direction of the first side face, and the light emitting direction of each first light source faces the light guide plate, wherein dead zones among light paths of the plurality of first light sources are all located in the first zones;
at least one second light source is arranged at least one end of the first side surface along the length direction of the first side surface, and the light emitting direction faces the light guide plate, so that the light path of the second light source covers at least part of the blind area in the first area.
2. The backlight module according to claim 1, wherein at least one second light source is disposed at two opposite ends of the first side surface along the length direction of the first side surface.
3. The backlight module according to claim 2, wherein when a plurality of second light sources are respectively disposed at each of two opposite ends of the first side surface, the plurality of second light sources are arranged along a length direction of the disposed side surface on the light guide plate.
4. The backlight module according to claim 2, wherein the light guide plate further has a second side surface and a third side surface, the second side surface and the third side surface are respectively located at two sides of the first side surface in the length direction and are oppositely arranged;
in the second area, the first area is a first area,
and along the length direction of the first side surface, the density of the mesh points on the light guide plate is gradually reduced from the middle position of the light guide plate to the second side surface and the third side surface.
5. The backlight module according to claim 4, wherein in the second region, along the length direction of the first side surface, the density of the dots at the middle position of the light guide plate is 1.5 times to 4.5 times that at the edge of the second side surface and is 1.5 times to 4.5 times that at the edge of the third side surface.
6. The backlight module according to claim 2, wherein in the first region, the dot density of the light guide plate in a dead zone between the light paths of every two first light sources is greater than the dot density of the light guide plate in the light path of each first light source.
7. The backlight module according to claim 2, wherein the light guide plate further has a second side surface and a third side surface, the second side surface and the third side surface are respectively located at two sides of the first side surface in the length direction and are oppositely arranged;
one edge of the light path of each second light source extends along the first side face.
8. The backlight module according to claim 7, wherein another edge of the light path of the second light source close to the second side surface extends along the second side surface;
another edge of the light path of the second light source close to the third side extends along said third side.
9. The backlight module according to claim 7 or 8, wherein a corner cut surface is formed between the first side surface and the second side surface, and another corner cut surface is formed between the first side surface and the third side surface;
and the light emergent surface of each second light source is arranged along the corresponding corner cutting surface.
10. A backlight module according to claim 9, wherein each of the corner cut surfaces is planar.
11. The backlight module according to claim 1, wherein in the thickness direction of the light guide plate, the distance between each of the two opposite side surfaces of the first light source and the plane of the corresponding side surface of the light guide plate is greater than or equal to 0.6mm, and the distance between each of the two opposite side surfaces of the second light source and the plane of the corresponding side surface of the light guide plate is greater than or equal to 0.6 mm.
12. The backlight module according to claim 1, wherein the light guide plate further has a fourth side surface disposed opposite to the first side surface.
13. A display device comprising the backlight module according to any one of claims 1 to 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020006801.XU CN210627725U (en) | 2020-01-02 | 2020-01-02 | Backlight module and display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020006801.XU CN210627725U (en) | 2020-01-02 | 2020-01-02 | Backlight module and display device |
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| Publication Number | Publication Date |
|---|---|
| CN210627725U true CN210627725U (en) | 2020-05-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020006801.XU Expired - Fee Related CN210627725U (en) | 2020-01-02 | 2020-01-02 | Backlight module and display device |
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| CN (1) | CN210627725U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217475A (en) * | 2021-12-28 | 2022-03-22 | 天马微电子股份有限公司 | Backlight module, preparation method thereof and display device |
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2020
- 2020-01-02 CN CN202020006801.XU patent/CN210627725U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114217475A (en) * | 2021-12-28 | 2022-03-22 | 天马微电子股份有限公司 | Backlight module, preparation method thereof and display device |
| CN114217475B (en) * | 2021-12-28 | 2023-12-22 | 天马微电子股份有限公司 | Backlight module, preparation method thereof and display device |
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