CN117031825A

CN117031825A - Backlight module and display device

Info

Publication number: CN117031825A
Application number: CN202311104022.8A
Authority: CN
Inventors: 耿苗; 季国飞; 叶利丹
Original assignee: HKC Co Ltd
Current assignee: HKC Co Ltd
Priority date: 2023-08-30
Filing date: 2023-08-30
Publication date: 2023-11-10

Abstract

The invention discloses a backlight module and display equipment. The backlight module comprises a back plate and a lamp plate arranged on the back plate, wherein the back plate comprises a bottom wall and a side wall connected with the bottom wall, the backlight module further comprises a blue light chip, white light beads, a light guide plate and quantum dots, and the blue light chip is arranged on the lamp plate and is opposite to the bottom wall of the back plate; the white light lamp beads are arranged on the lamp panel and are opposite to the side wall of the backboard; the light guide plate is arranged on the light emitting side of the white light lamp bead and is positioned on the light emitting side of the blue light chip; the quantum dots are positioned on the light emitting side of the blue light chip. According to the technical scheme, the blue light chip and the white light lamp beads are arranged on the lamp panel, the blue light chip is arranged corresponding to the bottom wall of the backboard, the white light lamp beads are arranged corresponding to the side wall of the backboard, and the backlight module further comprises the light guide plate and the quantum dots, so that the backlight module can achieve the effect of mutual switching between a high color gamut mode and a low color gamut mode.

Description

Backlight module and display device

Technical Field

The present invention relates to the field of display technologies, and in particular, to a backlight module and a display device using the backlight module.

Background

Along with development of technology, the technology of display devices is also mature, pursuing panel color gamut and thickness on the market is also higher, and a traditional Mini led (Mini Light-Emitting Diode) display screen can realize high color gamut, but because a quantum dot film needs to be arranged, a plurality of layers of Light homogenizing films need to be arranged in the quantum dot film, the thickness of the whole backlight module is thicker, the price is higher, and the like, and the traditional display devices do not have the advantage of switchable high and low color gamuts.

Disclosure of Invention

The invention mainly aims to provide a backlight module which aims to achieve the effect that display equipment is switched between a high color gamut and a low color gamut.

In order to achieve the above purpose, the backlight module provided by the invention comprises a back plate and a lamp panel arranged on the back plate, wherein the back plate comprises a bottom wall and side walls connected with the bottom wall, the backlight module further comprises a blue light chip, white light lamp beads, a light guide plate and quantum dots, and the blue light chip is arranged on the lamp panel and is opposite to the bottom wall of the back plate; the white light lamp beads are arranged on the lamp panel and are opposite to the side wall of the backboard; the light guide plate is arranged on the light emitting side of the white light lamp bead and is positioned on the light emitting side of the blue light chip; the quantum dots are located on the light emitting side of the blue light chip.

In an embodiment, a first light scattering structure is disposed on a side of the light guide plate facing the blue light chip, and the quantum dots are located on or in the first light scattering structure.

In an embodiment, the first light diffusing structure includes an upper protruding surface, where the upper protruding surface protrudes from a side of the light guide plate facing the blue light chip toward a side away from the blue light chip, and is disposed opposite to the blue light chip; the quantum dots are arranged on one side of the upper protruding surface, which faces the blue light chip.

In an embodiment, the first light scattering structure further includes a lower protruding surface protruding toward the blue light chip, the lower protruding surface is disposed opposite to the upper protruding surface, a cavity is formed together with the upper protruding surface, and the quantum dots are disposed in the cavity.

In one embodiment, the quantum dots are disposed proximate to the lower raised surface.

In an embodiment, a second light scattering structure is further disposed on a side of the light guide plate facing the blue light chip, and each first light scattering structure is disposed between two adjacent second light scattering structures.

In an embodiment, the second light diffusing structure is a protrusion protruding toward the bottom wall of the back plate or a depression recessed away from the bottom wall of the back plate.

In an embodiment, the second light scattering structures are provided in a plurality, and the density of the second light scattering structures near the side of the white light bulb is smaller than the density of the second light scattering structures far from the side of the white light bulb.

In an embodiment, the backlight module further includes an optical film, and the optical film is disposed on a side of the light guide plate away from the blue light chip.

The invention also provides display equipment, which comprises a display panel and the backlight module, wherein the display panel is arranged on the light emitting side of the backlight module.

According to the technical scheme, the blue light chip and the white light beads are arranged on the lamp panel, the blue light chip is arranged corresponding to the bottom wall of the backboard, the white light beads are arranged corresponding to the side wall of the backboard, and the backlight module further comprises the light guide plate and the quantum dots, so that when only the white light beads are lighted, the light rays emitted by the white light beads can emit relatively uniform light rays with a low color gamut after passing through the light guide plate; when only the blue light chip is lighted, after the blue light chip excites the quantum dots, red light and green light are excited, and mixed with the red light and the green light to form white light with high color gamut, and the white light with high color gamut can be emitted by the backlight module through the light homogenizing effect of the light guide plate. By the arrangement, the backlight module can achieve the effect of mutual switching between the high color gamut mode and the low color gamut mode.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic cross-sectional view of a backlight module according to an embodiment of the invention;

FIG. 2 is an enlarged view of a portion of FIG. 1 at A;

FIG. 3 is a schematic diagram illustrating an assembly structure of a lamp panel, a white light bulb and a blue light chip in a backlight module according to an embodiment of the invention;

FIG. 4 is a partial enlarged view at B in FIG. 3;

fig. 5 is a schematic cross-sectional view of an embodiment of a display device according to a second embodiment of the invention.

Reference numerals illustrate:

reference numerals	Name of the name	Reference numerals	Name of the name
				100	Backlight module	110	Backboard
111	Bottom wall	112	Side wall
				120	Lamp panel	130	Blue light chip
140	White light lamp bead	150	Light guide plate
				151	First light scattering structure	1511	Upper convex surface
1512	Lower convex surface	152	Second light scattering structure
				160	Optical film	170	Quantum dot
200	Display panel

The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.

In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

Embodiment one:

the invention provides a backlight module 100.

In the embodiment of the present invention, referring to fig. 1 to 4 in combination, the backlight module 100 includes a back plate 110 and a lamp panel 120 disposed on the back plate 110, the back plate 110 includes a bottom wall 111 and a side wall 112 connected to the bottom wall 111, the backlight module 100 further includes a blue light chip 130, a white light lamp bead 140, a light guide plate 150 and quantum dots 170, and the blue light chip 130 is disposed on the lamp panel 120 and is disposed opposite to the bottom wall 111 of the back plate 110; the white light beads 140 are disposed on the light panel 120 and are disposed opposite to the side wall 112 of the back plate 110; the light guide plate 150 is disposed on the light emitting side of the white light beads 140 and on the light emitting side of the blue light chip 130; the quantum dots 170 are located on the light-emitting side of the blue light chip 130.

The light panel 120 is disposed on the back plate 110, and a light source is disposed on the light panel 120 for providing light. In the present invention, the backlight module 100 includes a blue light chip 130 and a white light bead 140 both disposed on the light panel 120, and the blue light chip 130 is disposed opposite to the bottom wall 111 of the back plate 110, and the white light bead 140 is disposed opposite to the side wall 112 of the back plate 110, so that the backlight module 100 may have a direct backlight mode or a side-in backlight mode. In addition, by arranging the light guide plate 150, and the light guide plate 150 is arranged on the light emitting side of the white light lamp beads 140 and on the light emitting side of the blue light chip 130, the light emitted by the white light lamp beads 140 can be scattered by the light guide plate 150 and then emitted, so that a better light homogenizing effect is realized; and the light emitted by the blue light can be directly emitted from the light emitting side of the backlight module 100 after passing through the light guide plate 150. By arranging the quantum dots 170 on the light emitting side of the blue light chip 130, the light emitted by the blue light chip 130 can emit light with a high color gamut after exciting the quantum dots 170, thereby realizing the light emitting effect with a high color gamut.

Specifically, both the blue light chip 130 and the white light beads 140 may be individually lighted. The blue light chip 130 and the white light bead 140 may be disposed on the same lamp panel, and two control circuits are disposed on the lamp panel, and the two control circuits respectively and individually control the blue light chip 130 and the white light bead 140 to be turned on. Or the blue light chip 130 and the white light bead 140 may be respectively disposed on two light panels, so that the two light panels respectively and independently drive the blue light chip 130 and the white light bead 140 to light up, and the two circuit boards are spliced on the back plate 110. When the blue light chip 130 is turned on and the white light beads 140 are not turned on, the blue light chip 130 can excite the quantum dots 170 and emit more uniform light through the light guide plate 150, thereby realizing the effect of high color gamut light emission. When the white light beads 140 are turned on without turning on the blue light chip 130, the light emitted by the white light beads 140 can be scattered through the light guide plate 150 after passing through the light guide plate 150, so that a light homogenizing effect is achieved, and a normal color gamut light emitting effect is achieved at the moment.

The blue light chip 130 emits blue light, and the quantum dots 170 may include red quantum dots and green quantum dots, so that when the blue light emitted by the blue light chip 130 excites the red quantum dots and the green quantum dots, the finally emitted light has a higher color gamut. The quantum dots 170 may be disposed inside the light guide plate 150 or outside the light guide plate 150. When the quantum dots 170 are disposed outside the light guide plate 150, they may be disposed on one side of the light guide plate 150 facing the blue light chip 130, and at this time, the light emitted by the blue light chip 130 excites the quantum dots 170 to emit light with high color gamut, and then emits through the light guide plate 150; of course, the quantum dots 170 may also be disposed on a side facing away from the blue light chip 130, and at this time, the light emitted by the blue light chip 130 passes through the light guide plate 150 first, and then excites the red quantum dots and the green quantum dots in the quantum dots 170 to excite red light and green light, and mix with the red light and the green light to form white light for emitting, so as to achieve a high color gamut light emitting effect. Further, to reduce the risk of damage to the human eye caused by blue light leakage, in an example, the quantum dots 170 near the side wall 112 of the back plate 110 may be disposed more than the quantum dots 170 far from the side wall 112 of the back plate 110, so that blue light near the side wall 112 of the back plate 110 is converted into white light more fully after passing through the quantum dots 170. Alternatively, in another example, the blue light chip 130 on the side may be replaced with a white light bulb to reduce the risk of blue light leakage causing damage to the human eye.

According to the technical scheme, the blue light chip 130 and the white light beads 140 are arranged on the lamp panel 120, the blue light chip 130 is arranged corresponding to the bottom wall 111 of the back plate 110, the white light beads 140 are arranged corresponding to the side wall 112 of the back plate 110, and the backlight module 100 further comprises the light guide plate 150 and the quantum dots 170, so that when only the white light beads 140 are lighted, the light emitted by the white light beads 140 can emit relatively uniform light with a low color gamut after passing through the light guide plate 150; when only the blue light chip 130 is lighted, after the blue light chip 130 excites the quantum dots 170, red light and green light are excited, and mixed with the red light and the green light to form white light with a high color gamut, and the white light with a relatively uniform color gamut is emitted by the backlight module 100 through the light homogenizing effect of the light guide plate 150. Thus, the backlight module 100 can achieve the effect of switching between the high color gamut mode and the low color gamut mode.

In an example, referring to fig. 1 and fig. 2 in combination, a side of the light guide plate 150 facing the blue light chip 130 is provided with a first light scattering structure 151, and the quantum dots 170 are located on the first light scattering structure 151 or in the first light scattering structure 151.

The first light scattering structure 151 is a structure capable of scattering light. For example, the light source may be a convex or concave structure disposed on the light guide plate 150, and the light irradiates the convex or concave structures to change the propagation direction of the light, and by disposing a plurality of first light scattering structures 151 on the light guide plate 150, the light passing through the light guide plate 150 is more uniform under the action of diffuse reflection, so that the effect of changing the point light source into the surface light source can be achieved. By arranging the first light scattering structure 151 on the side of the light guide plate 150 facing the blue light chip 130, the quantum dots 170 are located on the first light scattering structure 151 or in the first light scattering structure 151, so that the distance between the quantum dots 170 and the first light scattering structure 151 is relatively short, and the distance between the quantum dots 170 and the blue light chip 130 is relatively short, so that the excitation efficiency of the blue light chip 130 for exciting the quantum dots 170 to emit light can be improved, that is, the utilization rate of the quantum dots 170 is improved, and a color gamut with higher purity can be obtained conveniently.

Further, referring to fig. 1 and 2 in combination, the first light diffusing structure 151 includes an upper protruding surface 1511, where the upper protruding surface 1511 protrudes from the light guiding plate 150 toward the blue light chip 130, and is disposed opposite to the blue light chip 130; the quantum dot 170 is disposed on a side of the upper bump surface 1511 facing the blue light chip 130.

By forming the upper convex surface 1511 on the side of the light guide plate 150 facing the blue light chip 130 and the side far away from the blue light chip 130, the light emitted by the blue light chip 130 can be better dispersed when passing through the upper convex surface 1511, thereby realizing a more uniform light emitting effect. In addition, by disposing the quantum dot 170 on the side of the upper protruding surface 1511 facing the blue light chip 130, the quantum dot 170 is disposed in the groove formed between the upper protruding surface 1511 and the blue light chip 130, so that the space in the thickness direction of the backlight module 100 is effectively utilized, and the thickness of the backlight module 100 is reduced. In addition, by the arrangement, the quantum dots 170 are closer to the blue light chip 130, which is beneficial to further improving the utilization rate of the quantum dots 170 and obtaining a higher-purity color gamut.

Further, referring to fig. 1 and 2 in combination, the first light diffusing structure 151 further includes a lower protruding surface 1512 protruding toward the blue light chip 130, where the lower protruding surface 1512 is opposite to the upper protruding surface 1511, and forms a cavity together with the upper protruding surface 1511, and the quantum dot 170 is disposed in the cavity.

By forming the lower protruding surface 1512 protruding in the direction of the light guide plate 150 towards the blue light chip 130, the lower protruding surface 1512 is opposite to the upper protruding surface 1511, and the lower protruding surface 1512 protrudes towards the direction of the blue light chip 130, a cavity is formed between the upper protruding surface 1511 and the lower protruding surface 1512, so that the quantum dots 170 are arranged in the cavity, the quantum dots 170 can be better protected, and risks of scratching the quantum dots 170 are avoided.

In addition, it can be understood that by disposing the quantum dots 170 in the cavity formed by the upper convex surface 1511 and the lower convex surface 1512, the arrangement of the protective layer and the multilayer light homogenizing film on two sides of the quantum dots 170 can be reduced, so that the thickness of the backlight module 100 can be reduced.

Further, referring to fig. 1 and 2 in combination, quantum dots 170 are disposed adjacent to the lower convex surface 1512.

By arranging the quantum dots 170 close to the lower convex surface 1512, the blue light chip 130 can be isolated from the quantum dots 170 only through the lower convex surface 1512, so that light rays emitted by the blue light chip 130 directly excite the quantum dots 170, the utilization rate of the quantum dots 170 is improved, and a higher-purity color gamut is obtained.

Further, referring to fig. 1 and 2 in combination, a second light-diffusing structure 152 is further disposed on a side of the light guide plate 150 facing the blue light chip 130, and each first light-diffusing structure 151 is disposed between two adjacent second light-diffusing structures 152.

By further arranging the second light diffusing structure 152 on the side of the light guide plate 150 facing the blue light chip 130, it can be understood that the second light diffusing structure 152 is not opposite to the blue light chip 130, so that the second light diffusing structure 152 can diffuse the light emitted by the white light beads 140, thereby ensuring that when only the white light beads 140 are lighted, the light homogenizing effect can be realized through the second light diffusing structure 152, and ensuring that the backlight module 100 has a uniform light emitting effect.

Specifically, referring to fig. 1 and 2 in combination, the second light diffusing structure 152 is a protruding portion of the light guiding plate 150 protruding toward the bottom wall 111 of the back plate 110 or a recessed portion recessed toward the bottom wall 111 facing away from the back plate 110.

By providing the second light diffusing structure 152 as a protruding portion protruding from the light guiding plate 150 toward the bottom wall 111 of the back plate 110, this may be achieved by hot pressing, laser, etc., so that the contact area between the light guiding plate 150 and the light plate 120 may be reduced, and the abrasion of the light guiding plate 150 may be reduced.

By providing the second light diffusing structure 152 as a concave portion that is concave from the light guiding plate 150 toward the direction away from the bottom wall 111 of the back plate 110, the thickness of the light guiding plate 150 is made smaller, thereby further achieving the effect of reducing the thickness of the entire backlight module 100.

Further, referring to fig. 1 and 2 in combination, the second light diffusing structures 152 are provided in plurality, and the density of the second light diffusing structures 152 on the side close to the white light beads 140 is smaller than that of the second light diffusing structures 152 on the side far from the white light beads 140.

It can be understood that after the white light beads 140 are turned on, more light enters the light guide plate 150 on the side close to the white light beads 140, less light enters the light guide plate 150 on the side far away from the white light beads 140, and the light on the side far away from the white light beads 140 can be dispersed more by setting the density of the second light scattering structures 152 on the side close to the white light beads 140 to be smaller than that of the second light scattering structures 152 on the side close to the white light beads 140, so that the light intensity near the white light beads 140 can be more similar to the light intensity of the white light beads 140, and the uniform light emitting effect of the backlight module 100 can be achieved.

Further, as shown in fig. 1, the backlight module 100 further includes an optical film 160, where the optical film 160 is disposed on a side of the light guide plate 150 facing away from the blue light chip 130.

By further providing the optical film 160 on the side of the light guide plate 150 facing away from the blue light chip 130, the light emitting taste can be further improved, and the light emitting has ideal brightness and uniformity.

Embodiment two:

the present invention also provides a display device, as shown in fig. 5, which includes a display panel 200 and a backlight module 100, where the specific structure of the backlight module 100 refers to the above embodiments, and since the display device adopts all the technical solutions of all the embodiments, at least the display device has all the beneficial effects brought by the technical solutions of the embodiments, and will not be described in detail herein. The display panel 200 is disposed on the light emitting side of the backlight module 100.

By arranging the display panel 200 on the light emitting side of the backlight module 100, the light emitted by the backlight module 100 can be emitted to the display panel 200, thereby being beneficial to the display panel 200 to display pictures. Specifically, based on the above-mentioned scheme that the backlight module 100 has the optical film 160, the side of the optical film 160 facing away from the light guide plate 150 is the light emitting side of the backlight module 100, and the display panel 200 may be disposed on the side of the optical film 160 facing away from the light guide plate 150.

The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the invention, and all equivalent structural changes made by the description of the present invention and the accompanying drawings or direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. The utility model provides a backlight unit, includes the backplate and locates the lamp plate of backplate, the backplate include the diapire with connect in the lateral wall of diapire, its characterized in that, backlight unit still includes:

the blue light chip is arranged on the lamp panel and is opposite to the bottom wall of the backboard; the white light lamp beads are arranged on the lamp panel and are opposite to the side wall of the backboard;

the light guide plate is arranged on the light emitting side of the white light lamp bead and is positioned on the light emitting side of the blue light chip;

and the quantum dots are positioned on the light emitting side of the blue light chip.

2. The backlight module according to claim 1, wherein a first light scattering structure is disposed on a side of the light guide plate facing the blue light chip, and the quantum dots are disposed on or in the first light scattering structure.

3. The backlight module according to claim 2, wherein the first light diffusing structure comprises an upper convex surface, and the upper convex surface is convex from one side of the light guide plate facing the blue light chip to one side of the light guide plate facing away from the blue light chip and is arranged opposite to the blue light chip; the quantum dots are arranged on one side of the upper protruding surface, which faces the blue light chip.

4. A backlight module according to claim 3, wherein the first light diffusing structure further comprises a lower convex surface protruding towards the direction of the blue light chip, the lower convex surface is opposite to the upper convex surface, a cavity is formed together with the upper convex surface, and the quantum dots are arranged in the cavity.

5. The backlight module of claim 4, wherein the quantum dots are disposed adjacent to the lower raised surface.

6. A backlight module according to any one of claims 2 to 5, wherein a second light-diffusing structure is further disposed on a side of the light guide plate facing the blue light chip, and each of the first light-diffusing structures is disposed between two adjacent second light-diffusing structures.

7. The backlight module according to claim 6, wherein the second light diffusing structure is a convex portion of the light guide plate protruding toward the bottom wall of the back plate or a concave portion of the light guide plate recessed toward a direction away from the bottom wall of the back plate.

8. The backlight module according to claim 6, wherein the second light diffusing structures are provided in plurality, and the density of the second light diffusing structures near the side of the white light bulb is smaller than the density of the second light diffusing structures far from the side of the white light bulb.

9. The backlight module of claim 8, further comprising an optical film disposed on a side of the light guide plate facing away from the blue light chip.

10. A display device comprising a display panel and a backlight module according to any one of claims 1 to 9, the display panel being arranged on the light exit side of the backlight module.