CN209784579U - Light guide plate and backlight module - Google Patents
Light guide plate and backlight module Download PDFInfo
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- CN209784579U CN209784579U CN201920389617.5U CN201920389617U CN209784579U CN 209784579 U CN209784579 U CN 209784579U CN 201920389617 U CN201920389617 U CN 201920389617U CN 209784579 U CN209784579 U CN 209784579U
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Abstract
the embodiment of the utility model discloses light guide plate and backlight unit. The light guide plate comprises a light incident surface, a light emergent surface and a bottom surface, wherein the light emergent surface is opposite to the bottom surface, the light incident surface is connected with the light emergent surface and the bottom surface, the light incident surface comprises a plurality of arc-like surfaces, and planes are arranged between adjacent arc-like surfaces; the arc-like surface is sunken towards the body of the light guide plate; each arc-like surface comprises two curved surfaces and a plane positioned between the two optical curved surfaces. The utility model provides a technical scheme can reduce dark space and corner dark space between the lamp.
Description
Technical Field
the embodiment of the utility model provides a relate to and show technical field, especially relate to a light guide plate and backlight unit.
Background
The lcd panel itself has no light emitting property, and therefore, a light source device, such as a backlight module, needs to be provided to the lcd panel, and the backlight module can be classified into a side-in type, a direct-down type and a hollow type according to the position of the light source.
Wherein, the traditional side income formula backlight unit chooses Emitting Diode (LED) as the backlight usually for use, because LED during operation can disperse great heat, and backlight unit's income Light side space is narrow and small to be unfavorable for the heat dissipation, therefore easily piles up the heat and leads to the ambient temperature in the backlight unit high on the contrary, and then arouses to die lamp, Light guide plate diaphragm warpage scheduling problem. In order to ensure the safety of the backlight module, in the prior art, the number of LEDs is usually reduced to reduce the amount of heat generated, but the problem of dark space between lamps and dark corner space is caused.
SUMMERY OF THE UTILITY MODEL
The utility model provides a light guide plate and backlight unit to dark space and corner dark space between the realization reduction lamp.
In a first aspect, an embodiment of the present invention provides a light guide plate, which includes:
The light incident surface is connected with the light emitting surface and the bottom surface;
The light incident surface comprises a plurality of arc-like surfaces, and planes are arranged between adjacent arc-like surfaces; the arc-like surface is sunken towards the body of the light guide plate; each arc-like surface comprises two curved surfaces and a plane positioned between the two optical curved surfaces.
Optionally, the perpendicular distance between the plane between adjacent arc-like surfaces and the plane of the arc-like surfaces is 0.5-0.8 mm.
Optionally, a light converging unit is further disposed on the plane of the arc-like surface.
optionally, the light converging unit is a cylindrical convex structure, and the convex direction of the cylindrical convex structure is opposite to the concave direction of the arc-like surface.
Optionally, a ratio of an area of the plane of the arc-like surface to an area of the arc-like surface is less than one third, and an area of a perpendicular projection of the light converging unit on the plane of the arc-like surface is less than or equal to the area of the plane of the arc-like surface.
Optionally, the curved surface is further provided with a light ray diverging unit.
Optionally, the light diverging unit includes a plurality of convex structures and/or concave structures with respect to the curved surface.
Optionally, the light diverging unit includes a prism structure.
In a second aspect, the embodiment of the present invention further provides a backlight module, where the backlight module includes:
A plurality of backlights and the light guide plate of any embodiment;
the backlight source is positioned on one side of the light incident surface of the light guide plate; the backlight sources are arranged in the arc-like surfaces in a one-to-one correspondence mode, and the centers of the backlight sources are opposite to the planes of the arc-like surfaces.
Optionally, the backlight and the light guide plate satisfy the following formula:
sina*n1＝sinb*n2；
D*tana＝(L/2)-(H/cotb)
H is the vertical distance between the light-emitting surface of the backlight source and the plane between the adjacent cambered surfaces; d is the vertical distance between the middle frame shielding edge of the display panel and the plane between the adjacent similar cambered surfaces; l is the distance between two adjacent backlight sources; n is1Is the refractive index of air; n is2Is the refractive index of the light guide plate; the vertical connecting line between the edge of the backlight source closest to the boundary and the boundary is S1, and a is the included angle between S1 and the normal of the light incident surface; and b is the refraction angle of the incident light in the light guide plate when the included angle between the incident light and the normal of the light incident surface is a.
The utility model discloses a set up a plurality of types of cambered surfaces on the income plain noodles of light guide plate for when backlight and type cambered surface are just to setting up one by one, two curved surfaces in every type of cambered surface disperse respectively with it and correspond the light that two edges of the backlight that sets up sent, thereby the angle of refraction of the light that the edge of increase backlight sent in the light guide plate, solve among the prior art because the great problem of coming lamp shadow dark space and corner dark space of interval between the adjacent backlight, the realization reduces the effect of lamp shadow dark space and corner dark space.
Drawings
Fig. 1 is a schematic diagram of a backlight module provided in the prior art;
Fig. 2 is a schematic top view of a light guide plate according to the present invention;
FIG. 3 is a schematic perspective view of the light guide plate provided in FIG. 2;
FIG. 4 is a working schematic diagram of a quasi-cambered surface provided by the present invention;
Fig. 5 is a schematic top view of another light guide plate provided by the present invention;
FIG. 6 is a schematic perspective view of the light guide plate provided in FIG. 5
Fig. 7 is a schematic top view of another light guide plate provided in the present invention;
FIG. 8 is a schematic perspective view of the light guide plate provided in FIG. 7;
Fig. 9 is a schematic perspective view of another light guide plate provided by the present invention;
Fig. 10 is a schematic view of a backlight module according to an embodiment of the present invention;
fig. 11 is a schematic diagram of the arc-like surface positioning provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a schematic diagram of a backlight module provided in the prior art. Referring to fig. 1, the backlight module includes a backlight 11 and a light guide plate 12, the backlight 11 is disposed right opposite to the light incident surface of the light guide plate 12, and light emitted from the backlight 11 is refracted after entering the light guide plate 12, however, since the emergent light of the backlight 11 has a certain emergent angle, a lamp space dark region 122 and a corner dark region 121 appear on the light guide plate 12, and both the lamp space dark region 122 and the corner dark region 121 exceed the middle frame shielding edge line 13 of the display panel, and then a plurality of dark regions appear in the display region of the display panel.
In view of this, an embodiment of the present invention provides a light guide plate, fig. 2 is a schematic top view of the light guide plate provided by the present invention, and fig. 3 is a schematic perspective view of the light guide plate provided by fig. 2. Referring to fig. 2 and 3, the light guide plate includes a light incident surface, a light emergent surface and a bottom surface, the light emergent surface is opposite to the bottom surface, the light incident surface is connected with the light emergent surface and the bottom surface, the light incident surface includes a plurality of arc-like surfaces 22, a plane 21 is arranged between adjacent arc-like surfaces 22, and the arc-like surfaces 22 are recessed toward the body of the light guide plate; each arc-like surface 22 comprises two curved surfaces 221 and a plane 222 located between the two curved surfaces 221.
In other embodiments, the light guide plate may further include a plurality of light incident surfaces, for example, the light guide plate includes two light incident surfaces, and the two light incident surfaces are disposed opposite to each other.
Fig. 4 is a working principle diagram of the arc-like surface provided by the present invention. Referring to fig. 4, the backlight sources correspond to the arc-like surfaces one to one, and the centers of the backlight sources are arranged opposite to the centers of the arc-like surfaces, so as to clearly compare the technical scheme of the present application with the scheme of the prior art, the dotted line represents the refracted ray when the light emitted from the edge of the backlight source is incident on the plane, and the solid line represents the refracted ray when the light emitted from the edge of the backlight source is incident on the curved surface. Specifically, when the light that the edge of backlight sent incides curved surface 221 of class cambered surface, compare in the plane light guide plate of incidenting among the prior art, the angle of incidence increases, can know according to the law of refraction, and the angle of emergence also correspondingly increases for dark space and corner dark space between the lamps reduce, and when dark space and corner dark space between the lamps reduced to display panel's center shielded in the edge line 13, then the dark space can not appear in display panel's display area. In addition, the plane 221 of the arc-like surface does not diffuse the light emitted by the backlight source, so that the light guide plate receives the light with relatively concentrated energy, and the light emitting brightness of the light guide plate is ensured.
The utility model discloses a set up a plurality of types of cambered surfaces on the income plain noodles of light guide plate, make when the backlight just to setting up with type cambered surface one by one, two curved surfaces in every type cambered surface disperse respectively with it correspond the light that two edges of the backlight that sets up send, make lamp shadow dark space and corner dark space reduce to display panel's center shield the edge in-line, and the light that the energy was relatively concentrated is received to the plane assurance light guide plate of type cambered surface, solve the problem of lamp shadow dark space and corner dark space, the realization reduces lamp shadow dark space and corner dark space, guarantee the effect of luminous luminance simultaneously.
on the basis of the above technical solution, optionally, a light converging unit is further disposed on the plane of the arc-like surface. The light converging unit may be disposed in various ways, and the following description is provided with reference to a typical example, but not intended to limit the present application.
fig. 5 is a schematic top view of another light guide plate according to the present invention, and fig. 6 is a schematic perspective view of the light guide plate shown in fig. 5. Referring to fig. 5 and 6, the light converging unit is a cylindrical convex structure 223, and the convex direction of the cylindrical convex structure 223 is opposite to the concave direction of the arc-like surface. The cylindrical convex structure 223 extends from the light-emitting surface of the light guide plate to the bottom surface of the light guide plate, and fig. 5 exemplarily shows that the projection of the cylindrical convex structure 223 on the light-emitting surface of the light guide plate is an arc shape, and in other technical solutions, the cylindrical convex structure may also be U-shaped. It should be noted that fig. 5 only exemplarily shows that a columnar convex structure is arranged on the plane 222 of the arc-like surface, and the area of the vertical projection of the columnar convex structure on the plane 222 of the arc-like surface is the same as the area of the plane 222 of the arc-like surface, but the present application is not limited thereto, and the number of the columnar convex structures 223 arranged on the plane 222 of the arc-like surface, and the area of the vertical projection of the columnar convex structures 223 on the plane 222 of the arc-like surface may be set by those skilled in the art according to the actual situation.
This arrangement is advantageous in that the columnar convex structures 223 can condense light incident thereon, thereby further improving the light emission luminance of the light guide plate.
optionally, a ratio of an area of the plane of the arc-like surface to an area of the arc-like surface is less than one third, and an area of a perpendicular projection of the light converging unit on the plane of the arc-like surface is less than or equal to the area of the plane of the arc-like surface. The arrangement can prevent most of the light rays emitted by the backlight source from reaching the convergence unit to be converged due to the overlarge light convergence unit, and prevent less light rays from reaching the cambered-surface-like curved surface to be diverged to influence the light-emitting uniformity of the light guide plate.
On the basis of the technical scheme, optionally, a light ray diverging unit is further arranged on the curved surface of the quasi-cambered surface. The light diverging unit may be disposed in various ways, and the following description is provided with reference to a typical example, but not intended to limit the present application.
Fig. 7 is a schematic top view of another light guide plate according to the present invention, and fig. 8 is a schematic perspective view of the light guide plate shown in fig. 7. Referring to fig. 3 and 4, the light diverging unit includes a prism structure 224. Specifically, at least one prism structure 224 is disposed on the curved surface of the arc-like surface, the prism structure 224 may be convex or concave relative to the curved surface of the arc-like surface, the prism structure 224 extends from the light-emitting surface of the light guide plate to the bottom surface of the light guide plate, and the vertical projection on the light-emitting surface of the light guide plate may be triangular, trapezoidal, or fan-shaped. The prism structure 224 may also extend from the boundary between the curved surface of the arc-like surface and the plane of the light guide plate to the boundary between the curved surface of the arc-like surface and the plane of the arc-like surface along the light exit surface parallel to the light guide plate, and the cross section perpendicular to the extending direction may be triangular, trapezoidal, or fan-shaped. It should be noted that the shape, size and number of the prism structures 224 can be set by those skilled in the art according to practical situations, and the present application is not limited thereto.
this arrangement is advantageous in that the prismatic structures 224 are capable of diffusing light incident thereon, enhancing the ability of the arc-like surfaces to diffuse light emitted from the edges of the backlight, thereby further reducing the area of the lamp shadow dark area and the corner dark areas.
Fig. 9 is a schematic perspective view of another light guide plate according to the present invention. Referring to fig. 9, the light diverging unit includes a plurality of convex structures (not shown in fig. 9) and/or concave structures 225 with respect to the curved surface. Specifically, at least one convex structure and/or concave structure 225 is arranged on the curved surface of the arc-like surface, and the projection of the prism structure on the curved surface of the arc-like surface can be regular figures such as circles or triangles, and can also be irregular figures. It can be understood that when the concave structure 225 is provided on the arc-like surface, only a mold having the same shape as the concave structure 225 needs to be imprinted on the arc-like surface, and the process is relatively simple.
Optionally, the diameter of the raised structures is less than 0.05mm, the diameter of the recessed structures 225 is less than 0.05mm, and the spacing between adjacent raised structures and/or raised structures is less than 0.1 mm.
The convex structures and/or the convex structures can enhance the divergence capacity of the arc-like surfaces to light rays emitted by the edge of the backlight source, so that the areas of the lamp shadow dark areas and the corner dark areas are further reduced.
On the basis of the technical scheme, optionally, the vertical distance between the plane between the adjacent arc-like surfaces and the plane of the arc-like surface is 0.5-0.8 mm.
The larger the vertical distance between the plane between the adjacent arc-like surfaces and the plane of the arc-like surfaces is, the larger the refraction angle of the arc-like surfaces to incident light is, which is more favorable for improving the problems of a lamp shadow dark area and a corner dark area, but the larger the vertical distance between the light guide plate and the light source is, the larger the light energy loss of the light source is, the smaller the emergent brightness of the light guide plate is, and the emergent brightness of the light guide plate is an important parameter for measuring the performance of the light guide plate. Therefore, the vertical distance between the plane between the adjacent arc-like surfaces and the plane of the arc-like surfaces needs to be reasonably set, and when the vertical distance is within the range, the light shadow dark area and the corner dark area can be smaller, and the light energy utilization rate of the backlight source can be ensured.
Fig. 10 is a schematic view of a backlight module according to an embodiment of the present invention, the backlight module includes: a plurality of backlight sources 11 and the light guide plate according to any embodiment of the present invention, the backlight sources 11 are located on one side of the light incident surface of the light guide plate; the backlights 11 are correspondingly arranged in the arc-like surfaces one by one, and the centers of the backlights 11 are opposite to the plane of the arc-like surfaces.
The backlight module comprises any one of the light guide plates, so that the backlight module has corresponding functions and beneficial effects.
It can be understood that, for prior art, this backlight unit has not only reduced the quantity of the backlight source to improve the heat dissipation, reduce cost, still avoided lamp shadow dark space and corner dark space to appear outside the center shields the edge, guaranteed light-emitting quality. In addition, the arc-like surface can be realized by finish machining, cutting and polishing, and can also be realized by injection molding of a mold, the technology is mature, and the processing is simple.
with continued reference to fig. 10, on the basis of the above technical solution, optionally, a light converging unit is further disposed on the plane of the arc-like surface; and the included angle C between the connecting line of the edge of the light convergence unit and the center of the backlight source and the direction vertical to the plane of the arc-like surface is less than 45 degrees. The arrangement can ensure that the size of the light converging unit is not too large, and further the cambered surface is influenced to enlarge the light energy distribution angle of the backlight source.
Fig. 11 is a schematic diagram of the arc-like surface positioning provided by the present invention. The backlight source and the light guide plate satisfy the following formula:
sina*n1＝sinb*n2；
D*tana＝(L/2)-(H/cotb)
H is the vertical distance between the light-emitting surface of the backlight source and the plane between the adjacent cambered surfaces; d is the vertical distance between the middle frame shielding edge of the display panel and the plane between the adjacent similar cambered surfaces; l is the distance between two adjacent backlight sources; n is1Is the refractive index of air; n is2Is the refractive index of the light guide plate; the vertical line between the edge of the backlight source nearest to the boundary and the boundary is S1, a is S1 and the incident surfaceThe angle between the normal lines of (a); and b is the refraction angle of the incident light in the light guide plate when the included angle between the incident light and the normal of the light incident surface is a.
Specifically, referring to fig. 10, two curved surfaces of the arc-like surface intersect with the light-emitting surface of the light guide plate, the intersection line is two curved surfaces, the two curved surfaces are two arcs on the same circumference, and the arc lengths are the same, and the missing arc sections between the two arcs are supplemented, so that the two arcs can be connected to form an arc 226. H. D, L, n1and n2for known quantity, the values of a and B can be calculated according to the above two formulas, and then two boundary points a and B of the arc 226 are calculated, that is, two points on the arc 226 are determined, and the vertical distance between the plane between adjacent arc-like surfaces and the plane of the arc-like surface can be approximately regarded as the vertical distance between the midpoint of the arc 226 and the plane between the adjacent arc-like surfaces, that is, the midpoint on the arc 226 is determined, so that the design parameters of the arc 226 are determined by the three points, and then the design parameters of the arc-like surfaces are determined by the ratio of the area of the plane of the arc-like surfaces to the area of the arc-like surfaces.
It should be noted that the foregoing is only a preferred embodiment of the present invention and the technical principles applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail with reference to the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the scope of the present invention.
Claims (10)
1. A light guide plate, comprising:
the light source comprises a light inlet surface, a light outlet surface and a bottom surface, wherein the light outlet surface is arranged opposite to the bottom surface, and the light inlet surface is connected with the light outlet surface and the bottom surface;
The light incident surface comprises a plurality of arc-like surfaces, and planes are arranged between the adjacent arc-like surfaces; the arc-like surface is sunken towards the body of the light guide plate; each cambered surface comprises two curved surfaces and a plane positioned between the two optical curved surfaces.
2. The light guide plate according to claim 1, wherein a perpendicular distance between a plane between the adjacent arc-like surfaces and a plane of the arc-like surfaces is 0.5-0.8 mm.
3. The light guide plate according to claim 1, wherein the plane of the arc-like surface is further provided with a light converging unit.
4. The light guide plate according to claim 3, wherein the light converging unit is a cylindrical convex structure, and the convex direction of the cylindrical convex structure is opposite to the concave direction of the arc-like surface.
5. The light guide plate according to claim 3, wherein the ratio of the area of the plane of the arc-like surface to the area of the arc-like surface is less than one third, and the area of the perpendicular projection of the light converging unit on the plane of the arc-like surface is less than or equal to the area of the plane of the arc-like surface.
6. the light guide plate according to claim 1, wherein the curved surface is further provided with a light diverging unit.
7. the light guide plate according to claim 6, wherein the light diverging unit comprises a plurality of convex structures and/or concave structures with respect to the curved surface.
8. The light guide plate according to claim 6, wherein the light diverging unit comprises a prism structure.
9. A backlight module, comprising:
A plurality of backlights and the light guide plate of any of claims 1-8;
the backlight source is positioned on one side of the light incident surface of the light guide plate; the backlight sources are arranged in the arc-like surfaces in a one-to-one correspondence mode, and the centers of the backlight sources are opposite to the planes of the arc-like surfaces.
10. The backlight module according to claim 9,
the backlight source and the light guide plate satisfy the following formula:
sina*n1＝sinb*n2；
D*tana＝(L/2)-(H/cotb)
h is the vertical distance between the light emitting surface of the backlight source and the plane between the adjacent arc-like surfaces; d is the vertical distance between the middle frame shielding edge of the display panel and the plane between the adjacent arc-like surfaces; l is the distance between two adjacent backlight sources; n is1is the refractive index of air; n is2Is the refractive index of the light guide plate; the vertical connecting line between the edge of the backlight source closest to the boundary and the boundary is S1, and a is the included angle between S1 and the normal of the light incident surface; and b is the refraction angle of the incident light in the light guide plate when the included angle between the incident light and the normal of the light incident surface is a.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920389617.5U CN209784579U (en) | 2019-03-26 | 2019-03-26 | Light guide plate and backlight module |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920389617.5U CN209784579U (en) | 2019-03-26 | 2019-03-26 | Light guide plate and backlight module |
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| Publication Number | Publication Date |
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| CN209784579U true CN209784579U (en) | 2019-12-13 |
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| CN201920389617.5U Active CN209784579U (en) | 2019-03-26 | 2019-03-26 | Light guide plate and backlight module |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034020A (en) * | 2021-11-30 | 2022-02-11 | 重庆惠科金扬科技有限公司 | Light assembly and display device |
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2019
- 2019-03-26 CN CN201920389617.5U patent/CN209784579U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114034020A (en) * | 2021-11-30 | 2022-02-11 | 重庆惠科金扬科技有限公司 | Light assembly and display device |
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