CN216311219U

CN216311219U - Backlight module and display device

Info

Publication number: CN216311219U
Application number: CN202122638245.5U
Authority: CN
Inventors: 辛武根; 徐萍; 季雅楠; 郑浩旋
Original assignee: HKC Co Ltd; Mianyang HKC Optoelectronics Technology Co Ltd
Current assignee: HKC Co Ltd; Mianyang HKC Optoelectronics Technology Co Ltd
Priority date: 2021-10-29
Filing date: 2021-10-29
Publication date: 2022-04-15
Anticipated expiration: 2031-10-29

Abstract

The application discloses a backlight module and a display device, wherein the backlight module comprises a back plate, a plurality of light bars and a light guide plate, the light bars are fixedly arranged on the back plate and are uniformly distributed on the back plate at intervals, and the light guide plate is arranged on the back plate; the lamp strip comprises a lamp strip and a plurality of lamp beads, and the plurality of lamp beads are uniformly arranged and fixed on the lamp strip; the light guide plate is provided with a plurality of grooves on one side facing the light bar, and the grooves are arranged corresponding to the light bar; a plurality of lamp strips are selectively opened. This application is through installing a plurality of lamp strips on the backplate, and set up a plurality of recesses that correspond with the lamp strip towards one side of advancing the lamp strip at the light guide plate, the recess correspondence covers on the lamp strip, and the alternative opening of lamp strip, wherein, the lamp pearl of lamp strip is ordinary LED lamp pearl, can adopt relatively simple circuit to carry out the independent control to the lamp strip when reduce cost, combine the even dimming action of recess to realize backlight unit's local dynamic light modulation.

Description

Backlight module and display device

Technical Field

The application relates to the technical field of display, in particular to a backlight module and a display device.

Background

Along with the demands of the high-end market of the display device on high-speed data transmission technology and the like, the backlight of the display device needs to realize the brightness adjustable function so as to realize the dynamic partition of the backlight module, thereby improving the contrast of the backlight module and improving the display effect of the backlight module. The currently commonly used technology is to realize dynamic partitioning of the backlight module by a Mini LED (Mini Light Emitting Diode, Mini LED for short) backlight module technology, but this scheme requires matching of a Mini LED lamp panel and a quantum film to form a white Light source, which is relatively high in cost; another common technique is to use a normally packaged LED (Light Emitting Diode, abbreviated as LED) lamp as a direct-type LED lamp panel to implement zone dimming, but because the lamp panel is generally implemented in an area of a module size, and a plurality of zone circuits are arranged in the lamp panel to control the lamp panel, the internal control of the circuit is relatively complicated.

SUMMERY OF THE UTILITY MODEL

The application aims to provide a backlight module and a display device, so that dynamic partition dimming of the backlight module with low cost, simple control and uniform brightness is realized.

The application discloses a backlight module, which comprises a back plate, a plurality of light bars and a light guide plate, wherein the light bars are fixedly arranged on the back plate and are uniformly distributed on the back plate at intervals, and the light guide plate is arranged on the back plate; the lamp strip comprises a lamp strip and a plurality of lamp beads, and the plurality of lamp beads are uniformly arranged and fixed on the lamp strip; a plurality of grooves are formed in one side, facing the light bar, of the light guide plate, and the grooves are arranged corresponding to the light bar; a plurality of the lamp strips can be selectively opened.

Optionally, the side edges of the back plate are respectively arranged along a first direction and a second direction, the light bars are arranged along the first direction, the length of the groove is greater than or equal to that of the light bars, the length of the light guide plate is less than or equal to that of the light bars along the groove arrangement direction, and the groove covers the whole light bars.

Optionally, the side edges of the back plate are respectively arranged along a first direction and a second direction, at least two light bars are arranged along the first direction, and the number of the light bars corresponds to the number of the grooves.

Optionally, the groove is of a structure with a small upper part and a large lower part.

Optionally, the groove is of a trapezoidal structure, and an opening of the groove is larger than a top surface of the groove, which is attached to the light guide plate.

Optionally, a first scattering microstructure is arranged on the light emitting surface of the light guide plate, and a second scattering microstructure is arranged on the light incident surface, opposite to the front surface of the light bar, in the groove.

Optionally, the light emitting surface of the light guide plate is provided with a first scattering microstructure, and the groove wall of the groove is provided with a second scattering microstructure.

Optionally, the first scattering microstructure and the second scattering microstructure are zigzag or wavy structures, and a distance between a peak and a trough of the second scattering microstructure is smaller than a distance between a peak and a trough of the first scattering microstructure.

Optionally, the distance from one side of the groove away from the light bar to the upper surface of the light bar is 0.1-0.3 MM.

The application also discloses a display device, including display panel and backlight unit, backlight unit installs one side of display panel's income plain noodles, backlight unit does display panel provides the backlight.

Compared with the prior art, the Light bar is formed by installing a plurality of Light bars consisting of lamp beads on the back plate, and the Light guide plate is provided with a plurality of grooves corresponding to the Light bars on one side facing the Light bars, after the Light guide plate is installed, the grooves are correspondingly covered on the Light bars, and the Light bars can be selectively opened, wherein the lamp beads of the Light bars are common LED (Light Emitting Diode) lamp beads, the cost can be reduced, and each Light bar is independently controlled to be selectively opened or closed, so that the complicated circuit is not required to be arranged on the whole back plate to independently control the lamp beads to adjust the Light, and the relative circuit is simpler; and because the design that has the recess on the light guide plate, can carry out even light effect to the lamp pearl of lamp strip the inside, make the pointolite of lamp pearl become even area source under the scattering of recess, the regional luminance that whole backlight unit shows is more even.

Drawings

The accompanying drawings, which are included to provide a further understanding of the embodiments of the application, are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application. It is obvious that the drawings in the following description are only some embodiments of the application, and that for a person skilled in the art, other drawings can be derived from them without inventive effort. In the drawings:

fig. 1 is a schematic structural diagram of a backlight module according to a first embodiment of the present application;

fig. 2 is an overall schematic view of a light bar and a back panel provided in the first embodiment of the present application;

fig. 3 is a schematic view of a light bar provided in a first embodiment of the present application;

fig. 4 is a schematic view of a light guide plate according to a first embodiment of the present application;

fig. 5 is an overall schematic view of a light bar and a back panel provided in a second embodiment of the present application;

fig. 6 is a schematic view of a light guide plate according to a third embodiment of the present application;

fig. 7 is a schematic view of the overall structure of the display device provided in the present application.

10, a display device; 100. a backlight module; 110. a back plate; 120. a light bar; 121. a light strip; 122. a lamp bead; 130. a light guide plate; 131. a groove; 132. a first scattering microstructure; 133. a second scattering microstructure; 140. a controller; 150. an optical film; 200. a display panel.

Detailed Description

It is to be understood that the terminology, the specific structural and functional details disclosed herein are for the purpose of describing particular embodiments only, and are relatively representative, but may be embodied in many alternate forms and should not be construed as limited to only the embodiments set forth herein.

The present application is described in detail below with reference to the figures and alternative embodiments.

The first embodiment:

fig. 1 is a schematic structural view of a backlight module provided in a first embodiment of the present application, fig. 2 is an overall schematic view of a light bar and a back plate provided in the first embodiment of the present application, fig. 3 is a schematic view of a light bar provided in the first embodiment of the present application, and referring to fig. 1 to fig. 3, a backlight module 100 disclosed in the present application includes a back plate 110, a light bar 120, and a light guide plate 130, wherein the light bar 120 is fixedly mounted on the back plate 110, and is uniformly arranged on the back plate 110 at intervals; the light guide plate 130 is mounted on the back plate 110, the light bar 120 includes a light strip 121 and a plurality of light beads 122, and the plurality of light beads 122 are uniformly arranged and fixed on the light strip 121; a plurality of grooves 131 are formed in one side of the light guide plate 130 facing the light bar 120, and the grooves 131 are arranged corresponding to the light bar 120; a plurality of the light bars 120 can be selectively turned on.

According to the LED backlight module, the plurality of light bars 120 consisting of the light beads 122 are installed on the back plate 110, the plurality of grooves 131 corresponding to the light bars 120 are formed in one side, facing the light bars 120, of the light guide plate 130, after the light guide plate 130 is installed, the grooves 131 correspondingly cover the light bars 120, and the light bars 120 can be selectively opened, wherein the light beads of the light bars are common LED light beads, the cost can be reduced, and then each light bar 120 is selectively opened or closed through independent control, so that a complex circuit does not need to be arranged on the whole back plate to independently control the light beads to adjust the light, and the relative circuit is simple; and because there is the design of recess 131 on the light guide plate 130, can carry out even light effect to the lamp pearl of lamp strip 120 the inside, make the pointolite of lamp pearl become even area light source under the scattering of recess, the regional luminance that whole backlight unit shows is more even.

The light bars 120 can be correspondingly provided with one or more controllers 140, and one controller 140 is arranged on each corresponding light bar 120, so that one controller 140 is independently controlled corresponding to one light bar 120, and the corresponding light bar 120 can be controlled to be turned on or off as required, so that local dimming can be performed in the area where the light bar 120 is located; because a lamp strip 120 is formed by a plurality of lamp beads 122 in a uniform arrangement, one or more lamp beads 122 on the lamp strip 120 can be correspondingly connected by one controller 140, the lamp beads 122 on the lamp strip 120 are partitioned, thus, the regions of the corresponding lamp beads 122 are correspondingly controlled by a plurality of controllers 140 on one lamp strip, the partition control is carried out in the range of one lamp strip 120, further local dynamic dimming effect on the backlight module 100 is realized, the lamp strip 120 is independently controlled and is uniformly dimmed in combination with the matching of the grooves 131, and the whole dimming visual effect of the whole backlight module is better.

Certainly, the light bar 120 can also be detachably connected with the back plate 110, so that after the light bar 120 is installed, if the light bar 120 or the lamp bead 122 is damaged, the targeted disassembly and maintenance can be conveniently carried out, and meanwhile, the cost can be saved.

Further, the side edges of the back plate 110 are respectively arranged along a first direction and a second direction, the light bars 120 are arranged along the first direction, and the length of the groove 131 is greater than or equal to that of the light bars 120; and the length of the light guide plate 130 along the arrangement direction of the grooves 131 is less than or equal to that of the light guide plate, and the grooves 131 cover the whole light bar 120. In this way, in the first direction, the number of the grooves 131 and the number of the light bars 120 are one, the grooves 131 correspondingly cover the whole light bars 120, and first, the light emitted by each light bar 120 after being turned on can be scattered and homogenized independently and intensively through the corresponding grooves 131, so that the brightness of the light scattered integrally is basically consistent, and the effect of uniform light is achieved; secondly, the whole area of recess 131 is great, and the light that scatters by other recess 131 scattering of next door can be more complete, improves the utilization ratio of light, can also further improve the scattering effect of light. Certainly, the length of the groove 131 mentioned here is smaller than the length of the light guide plate 130 along the arrangement direction of the groove 131 by a little, so that the two sides of the groove 131 extending along the length direction also have side walls, and the groove 131 forms a structure with five surfaces, which can completely cover the periphery of the whole light bar 120, so that the light of the light bar 120 is not leaked from the two sides of the groove 131 directly, thereby affecting the light utilization rate; the sidewall of the groove 131 is formed by inclining and recessing the light guide plate 130 from the surface of the light guide plate 130 close to the back plate 110 to the inside of the light guide plate 130. Moreover, the manufacturing process of correspondingly manufacturing one groove 131 by only one light bar 120 in one direction is relatively simple, easy to operate, time-saving and labor-saving.

Fig. 4 is a schematic view of a light guide plate provided in the first embodiment of the present application, and as shown in fig. 4, the groove 131 has a structure with a small top and a large bottom. That is to say recess 131 is bigger towards the opening direction of lamp strip 120, and recess 131 is bigger when covering lamp strip 120 like this, and the opening is bigger can carry out accurate counterpoint to lamp strip 120 to can be more swift with lamp strip 120 counterpoint cooperation, can be more fast during installation light guide plate 130, improve production efficiency.

Specifically, the groove 131 is a trapezoid structure, and an opening of the groove 131 is larger than a top surface of the groove 131 attached to the light guide plate 130. The trapezoid structure is a structure with a small upper part and a large lower part, so that the groove 131 covers the rear edge of the light bar 120 and has redundant space, and two side edges of the cross section of the groove 131 are inclined edges inclined inwards, so that a part of light can be scattered in a vertical direction in a concentrated manner when being emitted through the two side edges, and the scattered light is uniform and concentrated, and the brightness effect of the light is better; moreover, because both sides of each trapezoidal groove 131 are inclined inward, even if the light of the light bar 120 is scattered through the groove 131 on the light bar itself, a part of the light toward both sides will be scattered toward the sides, but when the part of the light reaches another groove 131, the part of the light can be scattered toward the light-emitting surface of the light guide plate 130 by the inclined sides of the grooves 131, so that the utilization rate of the light is further improved. Certainly, the structure can also be arranged into other structures with a small upper part and a large lower part, and the structure can be matched with the lamp strip 120 to achieve a better scattering effect on emergent light.

Moreover, a first scattering microstructure 132 is disposed on the light emitting surface of the light guide plate 130, and a second scattering microstructure 133 is disposed on the light incident surface opposite to the front surface of the light bar 120 in the groove 131. Because the light of the light source is basically concentrated in the direction vertical to the light-emitting surface, the second scattering microstructure 133 is arranged in the direction in which most of the light is emitted, so most of the light emitted by the light bar 120 can be scattered, the light is scattered more finely, and meanwhile, the scattering microstructure arranged on the light-emitting surface of the light guide plate 130 can enable the light to be atomized by the first scattering microstructure 132 when reaching the light-emitting surface, so that the whole light surface has an atomizing sense, and the light can not be dazzled when reaching human eyes.

Specifically, the first scattering microstructure 132 and the second scattering microstructure 133 are zigzag or wavy structures, and a distance between peaks and troughs of the second scattering microstructure 133 is smaller than a distance between peaks and troughs of the first scattering microstructure 132. The zigzag or wave-shaped scattering structures arranged on the light incident surface are smaller than those on the light emergent surface, so that light is evened on the light incident surface of the light rays to be thinner, the light rays are beaten into more light rays to be emitted from all directions, the light rays are more uniform, and the light ray irradiation area is wider; secondly because the scattering structure is done to the play plain noodles makes light have the atomizing sense after penetrating, can make the black point that leads to when having some foreign matters to drop on the play plain noodles like this and too obvious and influence whole display effect, makes the scattering structure of play plain noodles bigger relatively, and the effect of covering to the black point that the foreign matter produced like this can be better, and the people's eye is difficult to perceive.

Further, the distance from the side of the groove 131 far away from the light bar 120 to the upper surface of the light bar 120 is 0.1 MM to 0.3 MM. One side that recess 131 kept away from lamp strip 120 forms the top surface relative with lamp strip 120 upper surface, be provided with the interval between recess 131 top surface and the lamp strip 120 upper surface, the light that lamp strip 120 sent perpendicularly will be scattered after going through recess 131 through a short distance again, so lamp strip 120's perpendicular light can be concentrated more and is scattered, cooperate with the hypotenuse of recess 131 trapezium structure simultaneously, whole recess 131 is more even to lamp strip 120's light scattering effect, it is more abundant, and recess 131 covers owing to be equipped with the interval behind lamp strip 120 above, avoid recess 131's top surface and lamp strip 120 direct contact, follow-up whole installation causes the extrusion to lamp strip 120, damage lamp strip 120 easily.

Second embodiment:

fig. 5 is an overall schematic view of a light bar and a back plate provided in a second embodiment of the present application, and as shown in fig. 5, the difference between this embodiment and the first embodiment is that the side edges of the back plate 110 are respectively arranged along a first direction and a second direction, at least two light bars 120 are arranged along the first direction, and the number of the light bars 120 corresponds to the number of the grooves 131. In this way, the number of the controllers 140 is set to correspond to the number of the light bars 120 in the same direction, so that the light bars 120 are individually controlled by the controllers 140, and different light bars 120 are controlled to perform local dimming according to needs, thereby achieving a desired dimming effect; certainly, the lamp beads 122 can be further partitioned on one lamp strip 120, for example, two lamp beads 122 on the lamp strip 120 are partitioned into one region, and so on, the lamp strip 120 in the same direction can be further partitioned into a plurality of regions, each region is separately controlled by the connection circuit of the controller 140, so that the regional dimming control can be further performed on the lamp strip 120 in the same direction, and thus the lamp strip 120 on the whole back plate 110 can realize regional local dynamic dimming by controlling the lamp beads 122 in different regions, and the dimming effect is further optimized. The partitions of the lamp beads 122 on the lamp strip 120 can be further set to be three partitions or four partitions, and the partitions are connected with the corresponding controllers 140 through the distributed circuits to control so as to realize dynamic partition dimming with the lamp strip 120 as a unit, and further realize the dynamic partition dimming effect of the whole backlight module 100.

The third embodiment:

fig. 6 is a schematic view of a light guide plate according to a third embodiment of the present application, and as shown in fig. 6, the present embodiment is different from the first embodiment in that a light emitting surface of the light guide plate 130 is provided with a first scattering microstructure 132, and five surfaces in the groove 131 are provided with second scattering microstructures 133. The scattering microstructures on the five surfaces are matched with the trapezoid structures, so that light emitted from the lamp strip 120 towards the side surface in the groove 131 can be scattered through the scattering microstructures, and at the moment, light emitted from the whole lamp strip 120 by the groove 131 can be better scattered through the second scattering microstructures 133, so that the light is uniform in all directions, and the light sense is better. The zigzag or wavy shape of the other four surfaces of the trapezoid structure except the top surface can be set to be uneven, namely the zigzag or wavy shape of the other four surfaces is larger than that of the top surface, so that light can be emitted in a relatively concentrated direction after being scattered when the light is scattered, and the displayed light effect is brighter. Of course, the second scattering microstructures 133 on the five sides of the groove 131 can also be configured to have a uniform size as required.

Fig. 7 is a schematic view of an overall structure of a display device provided in the present application, and as shown in fig. 7, a display device 10 is disclosed, which includes a backlight module 100 and a display panel 200, where the backlight module 100 includes a back plate 110, a plurality of light bars 120, a light guide plate 130, and an optical film 150, the light bars 120 are fixedly mounted on the back plate 110, the optical film 150 is mounted on the light guide plate 130 to form an optical assembly, the optical assembly is mounted in a cavity formed by the back plate 110 and is disposed opposite to the light bars 120, a plurality of grooves 131 are disposed on one side of the light guide plate 130 facing the light bars 120, and the grooves 131 are disposed corresponding to the light bars 120; the plurality of light bars 120 can be selectively turned on; the backlight module 100 is installed at one side of the light incident surface of the display panel 200, and the backlight module 100 provides a backlight source for the display panel 200.

It should be noted that the concepts of the present application may be embodied in other specific forms and are not limited by the description above, but rather the claims are to be construed broadly and should not be construed to limit the scope of the disclosure; for those skilled in the art to which the present application pertains, several simple deductions or substitutions may be made without departing from the concept of the present application, and all should be considered as belonging to the protection scope of the present application.

Claims

1. The utility model provides a backlight module, includes backplate, a plurality of lamp strip and light guide plate, its characterized in that: the plurality of light bars are fixedly arranged on the back plate and are uniformly distributed on the back plate at intervals, and the light guide plate is arranged on the back plate; the lamp strip comprises a lamp strip and a plurality of lamp beads, and the plurality of lamp beads are uniformly arranged and fixed on the lamp strip; a plurality of grooves are formed in one side, facing the light bar, of the light guide plate, and the grooves are arranged corresponding to the light bar; a plurality of the lamp strips can be selectively opened.

2. The backlight module of claim 1, wherein the side edges of the back plate are respectively arranged along a first direction and a second direction, the light bars are arranged along the first direction, the length of the groove is greater than or equal to that of the light bars and less than or equal to that of the light guide plate along the direction of the groove, and the groove covers the whole light bars.

3. The backlight module of claim 1, wherein the side edges of the back plate are respectively arranged along a first direction and a second direction, at least two light bars are arranged along the first direction, and the number of the light bars corresponds to the number of the grooves.

4. The backlight module as claimed in claim 1, wherein the grooves have a small top and a large bottom.

5. The backlight module according to claim 4, wherein the recess has a trapezoid shape, and the opening of the recess is larger than the top surface of the recess facing the light guide plate.

6. The backlight module as claimed in claim 1, wherein a first scattering microstructure is disposed on a light emitting surface of the light guide plate, and a second scattering microstructure is disposed on a light incident surface opposite to the front surface of the light bar in the groove.

7. The backlight module as claimed in claim 1, wherein the light-emitting surface of the light guide plate is provided with a first scattering microstructure, and the walls of the grooves are provided with a second scattering microstructure.

8. The backlight module according to claim 6 or 7, wherein the first scattering microstructure and the second scattering microstructure are zigzag or wavy structures, and a pitch between peaks and valleys of the second scattering microstructure is smaller than a pitch between peaks and valleys of the first scattering microstructure.

9. The backlight module of claim 1, wherein the distance from the side of the groove away from the light bar to the upper surface of the light bar is 0.1 MM to 0.3 MM.

10. A display device, comprising a display panel and the backlight module according to any one of claims 1 to 9, wherein the backlight module is installed at one side of the light incident surface of the display panel, and the backlight module provides a backlight source for the display panel.