CN219916139U - High-brightness circular backlight assembly, display device and lighting fixture - Google Patents

Abstract

The utility model belongs to the field of display and illumination, and provides a high-brightness circular backlight assembly, display equipment and an illumination lamp, which comprise a plurality of LED lamp bars and a light guide plate, wherein the light guide plate comprises a first plane and a second plane which are parallel to each other, and a plurality of inclined planes which are connected with the first plane and the second plane; the luminous surface of the LED light bar is abutted with one end of the inclined surface, which is close to the first plane. Through the arrangement, the technical problems of large light loss and uneven brightness in the prior art are solved.

Description

High-brightness circular backlight assembly, display device and lighting fixture

Technical Field

The present utility model relates to the field of display and illumination, and in particular, to a high brightness circular backlight assembly, a display device, and an illumination lamp.

Background

The existing display devices (such as display screens and panel lamps) need a backlight module to provide uniform backlight, and then cooperate with other structures to form corresponding display contents according to requirements.

The backlight module may be divided into a side-in type backlight assembly and a direct type backlight module according to the positions of the LED light sources. The light source (generally, an LED light bar) of the side-in backlight module is arranged on the side face of the light guide plate, the bottom face of the light guide plate is provided with lattice points, and light emitted by the light source enters the light guide plate from the side part of the light guide plate and propagates to the direction of the liquid crystal screen through reflection and scattering of the reflecting sheet and the lattice points.

In a side-entry backlight module such as a liquid crystal display, a plate-shaped light guide plate is often used, and a light source is provided on a side surface of the plate-shaped light guide plate. At present, the light source emits light to reflect and refract repeatedly in the plate, and each reflection and refraction will result in a certain energy loss, so that a part of light may be absorbed or scattered in the light propagation process to cause light loss. Secondly, during the light propagation process, due to the influence of reflection and refraction, the light may generate hot spots or areas with uneven brightness in the light guide plate, so that the brightness distribution on the display or the backlight module is inconsistent. There is a need for a backlight assembly having less light loss and uniform brightness.

Disclosure of Invention

In view of the above, the embodiments of the present utility model provide a high-brightness circular backlight assembly for solving the technical problems of large light loss and uneven brightness in the prior art.

In a first aspect, an embodiment of the present utility model provides a high brightness circular backlight assembly, including a plurality of LED light bars and a light guide plate, where the light guide plate includes a first plane and a second plane parallel to each other, and a plurality of inclined planes connecting the first plane and the second plane; the luminous surface of the LED light bar is abutted with one end of the inclined surface, which is close to the first plane.

Further, the LED light bars are straight light bars, and each LED light bar corresponds to one inclined plane.

Further, the high-brightness circular backlight assembly further comprises a back plate, and the back plate is sequentially fixed with a reflecting sheet, the light guide plate and the light increasing sheet.

Further, a plurality of LED lamp strips are connected end to end.

Further, a plurality of LED lamp strips are arranged at intervals.

Further, the light enhancement sheet is DOPP or COPP.

Further, the light guide plate is a glass light guide plate.

In a second aspect, an embodiment of the present utility model provides a display device, including a liquid crystal screen and the above-mentioned high-brightness circular backlight assembly, where the liquid crystal screen covers the high-brightness circular backlight assembly.

In a third aspect, an embodiment of the present utility model provides a lighting fixture, including the above-mentioned high-brightness circular backlight assembly.

In summary, the beneficial effects of the utility model are as follows: adopt the inclined plane butt of LED lamp strip and light guide plate, the inclined plane can be through the total reflection effect with light guide plate inside for light more effectively transmits whole light guide plate. Compared with a plate-shaped light guide plate, the utility model can better control and guide light, reduce the loss of light and ensure that the backlight module has higher brightness. Secondly, the design of inclined plane can make light at the inside evenly distributed of light guide plate, reduces the uneven problem of luminance.

Drawings

In order to more clearly illustrate the technical solution of the embodiments of the present utility model, the drawings required to be used in the embodiments of the present utility model will be briefly described, and it is within the scope of the present utility model to obtain other drawings according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic view of a high brightness circular backlight module according to the present utility model;

fig. 2 is a schematic view of a light guide plate and an LED light bar according to the present utility model.

Parts and numbers in the figures: an LED light bar 10; a light guide plate 20; a first plane 21; a second plane 22; a slope 23; a back plate 30.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present utility model more clear, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. In the description of the present utility model, it should be understood that the terms "center," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article or apparatus that comprises the element. If not conflicting, the embodiments of the present utility model and the features of the embodiments may be combined with each other, which are all within the protection scope of the present utility model.

In a side-entry backlight module such as a liquid crystal display, a plate-shaped light guide plate is often used, and a light source is provided on a side surface of the plate-shaped light guide plate. At present, the light source emits light to reflect and refract repeatedly in the plate, and each reflection and refraction will result in a certain energy loss, so that a part of light may be absorbed or scattered in the light propagation process to cause light loss. Secondly, during the light propagation process, due to the influence of reflection and refraction, the light may generate hot spots or areas with uneven brightness in the light guide plate, so that the brightness distribution on the display or the backlight module is inconsistent.

In order to solve the above-mentioned problems, in a first aspect, an embodiment of the present utility model provides a high brightness circular backlight assembly, including a plurality of LED light bars 10 and a light guide plate 20, the light guide plate 20 including a first plane 21 and a second plane 22 parallel to each other, and a plurality of inclined planes 23 connecting the first plane 21 and the second plane 22; the light emitting surface of the LED light bar 10 abuts against one end of the inclined surface 23, which is close to the first plane 21.

In this embodiment, as shown in fig. 1 and 2, the light guide plate 20 adopted in the present utility model is different from the plate-shaped light guide plate 20 adopted in the prior art, in which the first plane 21 and the second plane 22 of the light guide plate 20 are parallel and equal in size, whereas the first plane 21 of the light guide plate 20 adopted in the present utility model is larger than the second plane 22, and the first plane 21 and the second plane 22 are spliced by means of a plurality of inclined planes 23, and the inclined planes 23 are not perpendicular to the first plane 21. The LED light bar 10 is obliquely arranged at the same time, and the light emitting surface of the LED light bar 10 is parallel to the inclined surface 23 and is abutted against the inclined surface 23. The LED light bar 10 is arranged on an inclined plane 23 at the outer edge position of the light guide plate 20.

Through the above arrangement, the light utilization rate can be improved, and the inclined surface 23 can guide the light to the inside of the light guide plate 20 through the total reflection effect, so that the light is more effectively transmitted to the entire light guide plate 20. Compared with the plate-shaped light guide plate 20, the light guide plate 20 with the inclined surface 23 can better control and guide light, reduce energy loss, improve light utilization rate and further improve brightness. By arranging the inclined surface 23 on the light guide plate 20, a more uniform illumination effect can be realized, the design of the inclined surface 23 can lead light to be uniformly distributed in the light guide plate 20, and the problems of hot spots or uneven brightness possibly occurring in illumination are reduced. Since the outer edge area of the light guide plate 20 is thinner, the LED light bar 10 is mounted on the inclined surface 23 of the outer edge of the light guide plate 20, which can effectively save the space of the backlight, and the LED light bar 10 and the circuit thereof can be more compactly mounted in the backlight assembly, leaving more space for other backlight assemblies or functional assemblies. By abutting the side entry light bar against the inclined surface 23, shadows and flare generated on the surface of the light guide plate 20 can be reduced. This is advantageous for improving the visibility and visual effect of the display or lighting system. In addition, by adjusting the size of the second plane 22, the propagation path and angle of the light within the light guide plate 20 can be affected, thereby improving viewing angle characteristics.

Further, the LED light bars 10 are straight light bars, and each LED light bar 10 corresponds to one of the inclined planes 23.

In the prior art, the LED light bar 10 of the circular backlight module generally adopts a section of curved light bar arranged in a partial area of the circular light guide plate 20 or a circle of light bar arranged outside the light guide plate 20, the former has less light bar arrangement, low display brightness and uneven light, and the latter has a circle of light bar which needs to be designed and manufactured if a hard light bar is adopted, so that the cost is higher. In the embodiment, straight lamp bars are adopted to form a polygon, so that light sources are arranged in all directions of the circular backlight assembly, and the brightness of a display product is high and uniform; secondly, the straight lamp strip is adopted to replace an arc lamp strip, the total service length of the lamp strip is shortened, and the cost of the lamp strip is saved; and the adoption of the straight lamp strip is not limited to be a hard lamp strip or a soft lamp strip, so that the adaptability is stronger.

Further, the high-brightness circular backlight assembly further includes a back plate 30, and a reflective sheet, the light guide plate 20 and a brightness enhancement sheet are sequentially fixed on the back plate 30.

Further, the light enhancement sheet is DOPP or COPP.

In the present embodiment, the backlight assembly further includes a back plate 30, and the back plate 30 functions as a fixed support. The light guide plate 20 is disposed between a reflective sheet and a light increasing sheet, and the reflective sheet plays roles of guiding, reflecting, diffusing and reducing light loss in the side-entry type backlight source to improve brightness, uniformity and efficiency of backlight illumination. The brightness enhancement film plays roles of improving brightness, enabling brightness distribution to be uniform, expanding visual angles and saving energy in the liquid crystal display, and improves the brightness and visual effect of the display. Preferably, the brightness enhancement sheet is a DOPP or COPP composite film, so that the display brightness and the uniformity of the brightness are further improved.

Further, a plurality of the LED light bars 10 are connected end to end.

In this embodiment, the LED light bar 10 is longer, and can be connected end to end, so that the display brightness can be higher, and the LED light bar 10 can basically cover the light guide plate 20 for a week, so that the brightness is more uniform.

Further, a plurality of the LED light bars 10 are arranged at intervals.

In this embodiment, in order to further save the cost of the light bar and shorten the length of the LED light bar 10, the LED light bars 10 are arranged on the inclined plane 23 at intervals, so that the arrangement can ensure that the light sources are arranged in all directions of the circular backlight assembly, but the light needs to be designed to ensure the uniformity of the light.

Further, the light guide plate 20 is a glass light guide plate.

In the embodiment, the glass light guide plate has long service life, and the cost of later maintenance is reduced; and secondly, the glass light guide plate has flexible process and can be cut according to actual requirements.

In a second aspect, an embodiment of the present utility model provides a display device, including a liquid crystal screen and the above-mentioned high-brightness circular backlight assembly, where the liquid crystal screen covers the high-brightness circular backlight assembly.

In a third aspect, an embodiment of the present utility model provides a lighting fixture, including the above-mentioned high-brightness circular backlight assembly.

In the embodiment, the display equipment and the lighting lamp adopting the high-brightness circular backlight assembly have the advantages that the utilization rate of light rays of the light source is high, the light rays are uniformly distributed, and the brightness of a product is high and the visual brightness is uniform.

Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present utility model, and not for limiting the same; although the utility model has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the utility model.

Claims (9)

1. A high brightness circular backlight assembly, comprising a plurality of LED light bars and a light guide plate, wherein the light guide plate comprises a first plane and a second plane which are parallel to each other, and a plurality of inclined planes which connect the first plane and the second plane; the luminous surface of the LED light bar is abutted with one end of the inclined surface, which is close to the first plane.

2. The high brightness circular backlight assembly of claim 1, wherein the LED light bars are straight light bars, one for each of the LED light bars.

3. The high brightness circular backlight assembly of claim 1, further comprising a back plate, wherein the back plate is sequentially fixed with a reflective sheet, the light guide plate and a light increasing sheet.

4. The high brightness circular backlight assembly of claim 2, wherein a plurality of said LED light bars are connected end to end.

5. The high brightness circular backlight assembly of claim 2, wherein a plurality of the LED light bars are spaced apart.

6. The high brightness circular backlight assembly of claim 3, wherein the light enhancement sheet is DOPP or COPP.

7. The high brightness circular backlight assembly of claim 1, wherein the light guide plate is a glass light guide plate.

8. A display device comprising a liquid crystal screen and the high brightness circular backlight assembly of any one of claims 1-7, the liquid crystal screen covering the high brightness circular backlight assembly.

9. A lighting fixture comprising the high brightness circular backlight assembly of any one of claims 1-7.