CN107092134B

CN107092134B - Backlight module and display device

Info

Publication number: CN107092134B
Application number: CN201710426874.7A
Authority: CN
Inventors: 林型岁; 陈文东
Original assignee: Shenzhen TCL New Technology Co Ltd
Current assignee: Shenzhen TCL New Technology Co Ltd
Priority date: 2017-06-07
Filing date: 2017-06-07
Publication date: 2021-04-09
Anticipated expiration: 2037-06-07
Also published as: CN107092134A

Abstract

The invention discloses a backlight module which comprises a light source, a light guide plate and a light color conversion layer, wherein the light guide plate comprises a first side end face and a second side end face, the light source is arranged on one side of the first side end face, the first side end face forms a light incident face, a microstructure is arranged on the second side end face, and the light color conversion layer is arranged on the surface of the microstructure. The invention also discloses a display device applying the backlight module. According to the invention, the light color conversion layer is arranged on the surface of the microstructure on the second side end face, so that light spots in the light guide plate are eliminated, and the visual experience of a user is improved.

Description

Backlight module and display device

Technical Field

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

Background

With the increasing demand of consumers and the development of the technical level, more and more new technologies are invented and applied to the field of liquid crystal display, aiming at improving the effect of liquid crystal display. At present, in order to adapt to the internal product structure of the liquid crystal display device, different structures need to be designed on the light-emitting surface of the light guide plate, but just because the light-emitting surface is uneven, light reflected by the light-emitting surface is converged in the light guide plate, so that light spots are formed in the light guide plate, and the visual experience of a user is reduced.

Therefore, it is an urgent need to provide a structure capable of eliminating the flare.

Disclosure of Invention

The invention mainly aims to provide a backlight module and a display device, aiming at eliminating light spots and improving the visual experience of a user.

In order to achieve the above object, the backlight module provided by the present invention comprises a light source, a light guide plate and a light color conversion layer, wherein the light guide plate comprises a first side end surface and a second side end surface; the light source is arranged on one side of the first side end face, and the first side end face forms a light incident face; the second side end face is provided with a microstructure, and the photochromic conversion layer is arranged on the surface of the microstructure.

Preferably, the microstructure includes at least one of a boss structure, a circular arc arch structure, and a conical structure.

Preferably, the microstructure is a boss structure, and the photochromic conversion layer is arranged on a boss surface of the boss structure.

Preferably, the photochromic conversion layer is attached to the surface of the microstructure in an adhesion mode.

Preferably, the light color conversion layer includes a light color conversion material layer and two white resin material layers, and the light color conversion material layer is disposed between the two white resin material layers.

Preferably, the light source is a blue light source, and the photochromic conversion material layer is a yellow conversion material layer.

Preferably, the backlight module further includes a reflective layer disposed on a surface of the light guide plate opposite to the light exit surface.

Preferably, the backlight module further includes a quantum film disposed on the light emitting surface of the light guide plate.

Preferably, the backlight module further comprises an optical film, and the optical film is arranged on one side of the quantum film far away from the light guide plate.

The invention also provides a display device comprising the backlight module.

In the technical scheme of the invention, the light color conversion layer is arranged on the surface of the microstructure with the uneven second side end surface of the light guide plate, so that colored light which is emitted back to the light guide plate at the microstructure on the second side end surface and is converged to form light spots is converted into white light by the light color conversion layer, the intensity of the colored light at the convergence part of reflected light in the light guide plate is weakened to be insufficient for naked eyes to observe, the light spots in the light guide plate are eliminated, and the visual experience of a user is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a backlight module according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of forming light spots in a light guide plate;

FIG. 3 is a schematic diagram of eliminating light spots in a light guide plate according to an embodiment of the present invention;

FIG. 4 is a cross-sectional view of a light color conversion layer of a backlight module according to an embodiment of the invention.

The reference numbers illustrate:

reference numerals	Name (R)	Reference numerals	Name (R)
				100	Backlight module	10	Light source
20	Light guide plate	20A	First side end face
				20B	Second side end surface	20C	Light emitting surface
21	Microstructure	30	Light colour conversion layer
				31	Photochromic conversion material layer	33	White resin material layer
40	Reflective layer	50	Quantum film
				60	Optical film

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that all the directional indicators (such as up, down, left, right, front, and rear … …) in the embodiment of the present invention are only used to explain the relative position relationship between the components, the movement situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indicator is changed accordingly.

In addition, the descriptions related to "first", "second", etc. in the present invention are only for descriptive purposes and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "connected," "secured," and the like are to be construed broadly, and for example, "secured" may be a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In addition, the technical solutions in the embodiments of the present invention may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination of technical solutions should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a backlight module.

Referring to fig. 1-3, in an embodiment of the invention, a backlight module 100 includes a light source 10, a light guide plate 20 and a light color conversion layer 30. In this embodiment, the light guide plate 20 is a substantially plate-shaped rectangular parallelepiped structure, specifically, the light guide plate 20 includes a first side end surface 20A, a second side end surface 20B, and a light emitting surface 20C connected to the first side end surface 20A and the second side end surface 20B, the light source 10 is disposed on one side of the first side end surface 20A, and the first side end surface 20A forms a light incident surface. The second side surface 20B is provided with a microstructure 21, and the photochromic conversion layer 30 is disposed on a surface of the microstructure 21. It should be noted that the second side end surface 20B may be any side end surface except for the light incident surface, and the light source 10 is only arranged on one side of the light guide plate 20 in fig. 1, but the present invention is not limited to only one light incident surface.

To prevent the loss of light energy, the light guide plate 20 needs to reflect light back to the light guide plate and then emit the light from the light exit surface 20C. The light guide plate 20 is limited by the appearance and the internal structure design of the product, for example, when the light guide plate needs to be assembled with other accessories of the product, exposed to be made into patterns for display, and the like, the second side end surface 20B of the light guide plate 20 needs to be made into the microstructures 21 with different patterns, because the inner walls of the microstructures 21 are uneven, the reflected light is converged to form light spots in the X region of the light guide plate 20, see fig. 2 specifically.

In the embodiment, the light color conversion layer 30 is disposed on the surface of the microstructure 21, and the light color conversion layer 30 converts the reflected colored light into white light by using the principle of complementary color light, so that the X region at the convergence position of the reflected light reduces the colored light reflected back from the surface of the microstructure 21, and the intensity of the colored light in the X region is reduced to an extent that the colored light is not enough to be distinguished by naked eyes, thereby achieving the effect of eliminating the light spots, specifically referring to fig. 3. In this embodiment, the photochromic conversion layer 30 is a photochromic conversion film and is attached to the surface of the microstructure 21.

The invention can obtain white light by using the principle of complementary color light, namely mixing two colors according to a certain proportion. Therefore, the photochromic conversion layer 30 and the colored light should be complementary colors, and the concentration and the chromaticity of the colored light are determined and then the concentration and the chromaticity of the photochromic conversion layer 30 are adjusted accordingly. In this embodiment, the light source 10 is a blue light source, the reflected light in the light guide plate 20 is a blue light, and the complementary color light of the blue light is a yellow color, so the light color conversion layer is a yellow color conversion layer. The blue light is reflected by the yellow conversion layer and converted into white light, which is returned to the light guide plate 20.

Referring to fig. 2 and fig. 3 together, in this embodiment, the method for adjusting the concentration and/or chromaticity of the light color conversion layer 30 includes the following steps:

step S1, determining the brightness uniformity of the light guide plate 20 and the threshold of the intensity of the colored light that the human eye can distinguish the light spot in the light guide plate 20; the determination method can be obtained according to the experience of the practitioner, or can be a continuous experiment to determine the threshold value of the intensity of the colored light.

Step S2, measuring the light intensity and color coordinate parameters of the X area and the periphery of the X area by a spectral radiance luminance meter; if the light intensity in the X region is greater than the colored light intensity threshold value at this time, step S3 is performed.

Step S3, after disposing the light color conversion layer 30 on the surface of the microstructure 21, measuring the brightness and color coordinate parameters of the X region and the surrounding of the X region by a light-splitting luminance meter; specifically, the spectral radiance in step S2 and step S3 is CS 2000.

Step S4, adjusting the concentration and/or chromaticity of the light color conversion layer 30 when the luminance of the X region measured in step S3 is greater than the colored light intensity threshold, and returning to step S3; when the luminance of the X region measured in step S3 is less than the colored light intensity threshold, the concentration and/or chromaticity of the photochromic conversion layer 30 corresponding to the luminance of the X region being less than the colored light intensity threshold is determined as the adjusted concentration and/or chromaticity of the photochromic conversion layer 30.

It should be noted that the number of the microstructures 21 on the second side surface 20B may be one or more, and the specific shapes of the microstructures 21 are also various, including a boss structure, an arc-shaped structure, and a cone structure. In this embodiment, the microstructure 21 is a boss structure formed by extending outward from the second side end surface 20B, the photochromic conversion layer is disposed on a boss surface of the boss structure, and specifically, the photochromic conversion layer 30 and the boss surface may be bonded together by adhesion.

Preferably, referring to fig. 4, the light color conversion layer 30 includes a light color conversion material layer 31 and two white resin material layers 33, and the light color conversion material layer 31 is disposed between the two white resin material layers 33.

The light color conversion layer 30 is obtained by applying a light color conversion material on the white resin material layer 33 to form a light color conversion material layer 31, and then covering and pressing another white resin material layer 33 on the light color conversion material layer 31. When the colored light is blue light, the color conversion layer 30 is a yellow conversion layer, i.e. the color conversion material layer 31 is a yellow conversion material layer. In addition, in order to match the surfaces of different microstructures 21, the photochromic conversion layer 30 may be cut so that the photochromic conversion layer 30 is matched with the surface of the microstructure 21.

The light color conversion material may be a photoelectric material having an excitation effect, for example, a white light fluorescent material excited by blue light may be used to prepare the yellow conversion layer.

Preferably, in order to further prevent the loss of light energy, a reflective layer 40 is further disposed on a surface of the light guide plate 20 opposite to the light exit surface 20C, and the reflective layer is used for reflecting the light on the surface opposite to the light exit surface 20C, so as to directly enhance the luminance of the light exit surface 20C, and further improve the light emitting effect of the backlight module 100.

Preferably, the backlight module 100 further includes a quantum film 50, and the quantum film 50 is disposed on the light emitting surface 20C of the light guide plate 20.

The quantum film 50 can improve the color gamut of the backlight assembly 100, and as an example, the light source is a blue light source, and the quantum film 50 can convert part of the blue light emitted by the light source into red light and green light, so that the displayed light effect has richer colors, and the user experience is improved.

Preferably, the backlight module 100 further includes an optical film 60, and the optical film 60 is disposed on a side of the quantum film 50 opposite to the light guide plate 20.

Different optical films can be selected according to the display characteristics of the backlight module 100, including at least one of a brightness enhancement film, a light filter film, an optical protection film, a polarization film, a light splitting film and a phase film, wherein the brightness enhancement film is on the surface of PET with very good transparency, an optical film which is formed by making an acrylic resin into a prism structure with precise forming and a back light diffusion layer combination is applied to the upper layer of the backlight module, the light is recycled and condensed through the structure of the brightness enhancement film, the brightness enhancement effect is generated, the optical coupling phenomenon is eliminated, the display light of the backlight module is more uniform and softer, and the user experience is improved.

The invention also provides a display device comprising the backlight module. Since the display device adopts all the technical solutions of all the embodiments, at least all the beneficial effects brought by the technical solutions of the embodiments are achieved, and no further description is given here.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. The backlight module is characterized by comprising a light source, a light guide plate and a light color conversion layer, wherein the light guide plate comprises a first side end face and a second side end face; the light source is arranged on one side of the first side end face, and the first side end face forms a light incident face; the second side end face is provided with a microstructure, the light color conversion layer is arranged on the surface of the microstructure, the light source is a light source emitting colored light, and the color of the light color conversion layer and the color of the light source are complementary colors; the light color conversion layer comprises a light color conversion material layer and two white resin material layers, and the light color conversion material layer is arranged between the two white resin material layers; the micro structure comprises at least one of a boss structure, an arc arch structure and a cone structure.

2. The backlight module as claimed in claim 1, wherein the microstructure is a mesa structure, and the light color conversion layer is disposed on a mesa surface of the mesa structure.

3. The backlight module as claimed in claim 1, wherein the photochromic conversion layer is bonded to the surface of the microstructure by adhesion.

4. The backlight module as claimed in claim 1, wherein the light source is a blue light source, and the light color conversion material layer is a yellow color conversion material layer.

5. The backlight module according to any one of claims 1-4, further comprising a reflective layer disposed on a side of the light guide plate opposite to the light exit surface.

6. The backlight module according to any one of claims 1-4, further comprising a quantum film disposed on the light-emitting surface of the light guide plate.

7. The backlight module according to claim 6, further comprising an optical film disposed on a side of the quantum film away from the light guide plate.

8. A display device comprising the backlight module according to any one of claims 1-7.