CN216387452U - Light guide plate, backlight assembly, liquid crystal display module and liquid crystal display device - Google Patents

Abstract

The utility model provides a light guide plate, backlight unit, liquid crystal display module assembly and liquid crystal display equipment belongs to liquid crystal display technical field. The light guide plate includes a light guide plate body. At least part of the surface of the light guide plate main body is provided with an antireflection film and/or a protective film. The light transmittance of the light guide plate is improved by arranging the antireflection film on the surface of the light guide plate, so that the display brightness can meet the requirement even if a light source is driven by a small current. Through setting up the protection film, avoided in mechanical test and daily use, the light guide plate surface produces the mar to reduce the production of bad condition such as white spot or shadow, in liquid crystal display equipment, the light guide plate can set up with other inside structures of liquid crystal display equipment more closely, is favorable to reducing liquid crystal display equipment's whole thickness.

Description

Light guide plate, backlight assembly, liquid crystal display module and liquid crystal display device

Technical Field

The disclosure relates to the technical field of liquid crystal display, in particular to a light guide plate, a backlight assembly, a liquid crystal display module and liquid crystal display equipment.

Background

A liquid crystal display module is an important component of a liquid crystal display device, and generally includes a liquid crystal display panel, a backlight assembly and a back frame, wherein the backlight assembly includes a light source and a light guide plate.

The light guide plate is generally made of a PC (polycarbonate) material, but the PC material has poor scratch resistance on the surface and is prone to scratches. For example, in a mechanical test, the light guide plate is likely to be in frictional collision with other structures such as a back frame inside the liquid crystal display device, and scratches are generated on the surface of the light guide plate. In the using process, when the liquid crystal display device shakes or falls, the light guide plate may be rubbed with other structures such as a back frame inside the liquid crystal display device to form scratches. The scratch on the surface of the light guide plate can cause the liquid crystal display module to generate white spots or shadows and other adverse conditions in the display process. In order to avoid scratching the light guide plate, a certain gap is usually left between the light guide plate and other structures inside the liquid crystal display device. Meanwhile, because the light guide plate made of PC material has low light transmittance, a large current is usually used to drive the light source in order to ensure the display brightness.

A certain gap is left between the light guide plate and other structures inside the liquid crystal display device, which results in a relatively large overall thickness of the liquid crystal display device. The light source is driven by larger current, the power consumption of the light source is higher, and the endurance time of the liquid crystal display device can be shortened.

SUMMERY OF THE UTILITY MODEL

The embodiment of the disclosure provides a light guide plate, a backlight assembly, a liquid crystal display module and a liquid crystal display device, which can meet the requirement on brightness while reducing power consumption and reduce the generation of white spots, shadows and other adverse conditions. The technical scheme is as follows:

in a first aspect, embodiments of the present disclosure provide a light guide plate, including a light guide plate body;

at least part of the surface of the light guide plate main body is provided with an antireflection film and/or a protective film.

Optionally, the at least part of the surface comprises at least one of:

the light guide plate comprises a light guide plate body, a light emergent surface and a light incident surface, wherein the surface of the light guide plate body is subjected to friction force, and the light emergent surface and the light incident surface of the light guide plate body are arranged on the surface of the light guide plate body.

Optionally, the surface of the light guide plate body that is subject to the frictional force includes:

a first surface and a second surface perpendicular to a thickness direction of the light guide plate body.

Optionally, the antireflection film is disposed on the at least part of the surface, and the protective film is disposed on the antireflection film.

Optionally, the thickness of the antireflection film is 200nm to 380 nm.

Optionally, the antireflection film is made of at least one of titanium dioxide, titanium sesquioxide, aluminum oxide, and silicon dioxide.

Optionally, the thickness of the protective film is 3 μm to 5 μm.

Optionally, the material of the protective film is nano silicon oxide.

Optionally, the hardness of the protective film is 1H to 3H.

Optionally, the light transmittance of the protective film is not less than 90%.

In a second aspect, embodiments of the present disclosure further provide a backlight assembly, which includes a light source and the light guide plate according to the first aspect, wherein the light source is located on one side of the light guide plate.

In a third aspect, an embodiment of the present disclosure further provides a liquid crystal display module, which includes a liquid crystal display panel and the backlight assembly as described in the foregoing second aspect.

In a fourth aspect, embodiments of the present disclosure further provide a liquid crystal display device, which includes the liquid crystal display module according to the third aspect.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the light transmittance of the light guide plate is improved by arranging the antireflection film on the surface of the light guide plate, so that the display brightness can meet the requirement even if a light source is driven by a small current. Through setting up the protection film, avoided in mechanical test and daily use, the light guide plate surface produces the mar to reduce the production of bad condition such as white spot or shadow, in liquid crystal display equipment, the light guide plate can set up with other inside structures of liquid crystal display equipment more closely, is favorable to reducing liquid crystal display equipment's whole thickness.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a light guide plate body according to an embodiment of the present disclosure;

fig. 2 is a cross-sectional view of a light guide plate according to an embodiment of the present disclosure;

fig. 3 is a cross-sectional view of a light guide plate according to an embodiment of the present disclosure;

fig. 4 is a cross-sectional view of a light guide plate according to an embodiment of the present disclosure;

fig. 5 is a schematic light guide diagram of a light guide plate according to an embodiment of the disclosure;

fig. 6 is a schematic light guide diagram of a light guide plate according to an embodiment of the disclosure;

fig. 7 is a schematic structural diagram of a light guide plate body according to an embodiment of the disclosure;

fig. 8 is a schematic structural diagram of a backlight assembly provided in an embodiment of the present disclosure;

fig. 9 is a schematic structural diagram of a backlight assembly provided in an embodiment of the present disclosure;

fig. 10 is a schematic structural diagram of a liquid crystal display module according to an embodiment of the disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this disclosure belongs. The use of "first," "second," "third," and similar terms in the description and claims of the present disclosure are not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprise" or "comprises", and the like, means that the element or item listed before "comprises" or "comprising" covers the element or item listed after "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, which may also change accordingly when the absolute position of the object being described changes.

The embodiment of the present disclosure provides a light guide plate, which includes a light guide plate main body and a film layer, wherein the film layer is disposed on at least a part of the surface of the light guide plate main body. The film layer includes at least one of an antireflection film and a protective film. When the film layer includes an antireflection film and a protection film, the antireflection film and the protection film may be disposed on different regions of the surface of the light guide plate body, for example, on different surfaces of the light guide plate body, or on the same surface of the light guide plate body, but not overlapped. The antireflection film and the protective film may also be stacked on the surface of the light guide plate body.

Alternatively, when the antireflection film and the protective film are stacked, the antireflection film is disposed on the surface of the light guide plate body, and the protective film is disposed on the antireflection film, that is, the protective film is disposed on the side of the antireflection film away from the light guide plate body. Because the light guide plate main body and the antireflection film are low in strength and easy to wear, the protective film is arranged on the outermost layer, and the light guide plate main body and the antireflection film can be protected.

The light transmittance of the light guide plate is improved by arranging the antireflection film on the surface of the light guide plate, so that the display brightness can meet the requirement even if a light source is driven by a small current. Through setting up the protection film, avoided in mechanical test and daily use, the light guide plate surface produces the mar to reduce the production of bad condition such as white spot or shadow, in liquid crystal display equipment, the light guide plate can set up with other inside structures of liquid crystal display equipment more closely, is favorable to reducing liquid crystal display equipment's whole thickness.

Fig. 1 is a schematic structural diagram of a light guide plate body according to an embodiment of the present disclosure. As shown in fig. 1, the light guide plate body 10 has a plate shape and has a plurality of surfaces. The plurality of surfaces include at least a first surface 11 and a second surface 12 perpendicular to a thickness direction of the light guide plate body 10, and a plurality of side surfaces connecting the first surface 11 and the second surface 12. The first surface 11 and the second surface 12 are also opposite surfaces of the light guide plate body 10. The film layer may be located on any one or several of the first surface 11, the second surface 12, several sides.

Taking an example that an antireflection film and a protection film are stacked on a surface of a light guide plate body, fig. 2 is a cross-sectional view of a light guide plate provided in an embodiment of the disclosure. As shown in fig. 2, in the light guide plate, the antireflection film 20 is disposed on the first surface 11 of the light guide plate main body 10, and the protection film 30 is disposed on a surface of the antireflection film 20 away from the light guide plate main body 10.

Fig. 3 is a cross-sectional view of a light guide plate according to an embodiment of the present disclosure. As shown in fig. 3, in the light guide plate, the antireflection film 20 is disposed on the second surface 12 of the light guide plate main body 10, and the protection film 30 is disposed on a surface of the antireflection film 20 away from the light guide plate main body 10.

Fig. 4 is a cross-sectional view of a light guide plate according to an embodiment of the present disclosure. As shown in fig. 4, in the light guide plate, the antireflection film 20 is disposed on the first surface 11 and the second surface 12, and the protection film 30 is disposed on the surface of the antireflection film 20 away from the light guide plate body 10.

Optionally, the surface on which the film layer is located comprises at least one of: the light guide plate includes a surface of the light guide plate body 10, which is subjected to a frictional force, a light exit surface of the light guide plate body 10, and a light entrance surface of the light guide plate body 10.

Referring to fig. 1, a surface of a light guide plate body 10, which is subject to a frictional force, includes: a first surface 11 and a second surface 12 perpendicular to the thickness direction of the light guide plate body 10. The first surface 11 and the second surface 12 are the two largest surfaces of the light guide plate body, and have a large contact area with other structures inside the electronic device, so that abrasion is relatively easy to occur.

Because the light guide plate is installed inside electronic equipment, and there is the contact with other spare parts, light guide plate main part 10 can receive the friction, produces wearing and tearing, consequently receives frictional force's surface with the rete setting in the surface of light guide plate main part 10, avoids light guide plate main part 10 and other spare parts to form direct contact, avoids light guide plate main part 10 to receive wearing and tearing. When the backlight module is used, the light source is located at one side of the light incident surface of the light guide plate main body, and light enters the light guide plate main body 10 through the light incident surface and exits through the light exiting surface of the light guide plate main body 10. The income plain noodles of light guide plate main part 10 receives wearing and tearing can influence light and get into the light guide plate, sets up the rete at the income plain noodles of light guide plate main part 10, can avoid going into the plain noodles and appear wearing and tearing. Under the action of the antireflection film 20, more light rays can enter the light guide plate from the light incident surface. The brightness of the light emitting surface is reduced due to the abrasion of the light emitting surface of the light guide plate body 10, so that the brightness of the display panel is reduced, and the film layer is arranged on the light emitting surface of the light guide plate body 10, so that the abrasion of the light emitting surface can be avoided. Under the action of the antireflection film 20, more light can be emitted from the light emitting surface, which is beneficial to improving the brightness of the display panel.

The light emitting surface of the light guide plate body may be the first surface 11 shown in fig. 1. According to the different arrangement of the light sources in the backlight module, in some examples, the light incident surface of the light guide plate body 10 is the second surface 12, and in other examples, the light incident surface of the light guide plate body 10 is at least one of several side surfaces.

Fig. 5 is a schematic light guide diagram of a light guide plate according to an embodiment of the disclosure, where arrows indicate the directions of light rays. As shown in fig. 5, the light incident surface and the light emitting surface of the light guide plate body 10 are respectively the second surface 12 and the first surface 11, the light incident surface and the light emitting surface are provided with an antireflection film 20 and a protection film 30, and several side surfaces of the light guide plate body 10 are provided with the protection film 30.

Fig. 6 is a schematic light guide diagram of a light guide plate according to an embodiment of the disclosure. As shown in fig. 6, the light incident surface of the light guide plate body 10 is one of a plurality of side surfaces, the light emitting surface is a first surface 11, the antireflection film 20 and the protection film 30 are disposed on the light incident surface and the light emitting surface, and the protection film 30 is disposed on the second surface 12 and a part of the side surfaces of the light guide plate body 10.

Fig. 7 is a schematic structural diagram of a light guide plate body according to an embodiment of the disclosure. As shown in fig. 7, the second surface 12 of the light guide plate body 10 is provided with reflective dots 121, and the first surface 11 is provided with V-shaped grooves 111. The reflective dots 121 on the second surface 12 can disperse and reflect light inside the light guide plate to the first surface 11, and the V-shaped grooves 111 on the first surface 11 can uniformly distribute the emitted light.

Optionally, the thickness of the antireflection film 20 is 200nm to 380 nm. The thickness of the antireflection film 20 may be set to 0.5 times the wavelength of white light. The anti-reflection film 20 can significantly improve the brightness of the light guide plate within a proper thickness range, the brightness improvement effect is not obvious due to too thin or too thick thickness, the difficulty and cost of coating can be increased due to too large thickness of the anti-reflection film 20, and the thickness uniformity of the anti-reflection film 20 is poor during coating, which may affect the brightness uniformity of the light guide plate.

As an example, in the disclosed embodiment, antireflection film 20 has a thickness of 300 nm.

Optionally, the material of the antireflection film 20 is at least one of titanium dioxide, titanium sesquioxide, aluminum oxide, and silicon dioxide. The coating film made of the materials has good light transmission performance and is relatively cheap, and the cost can be reduced while the anti-reflection effect is met.

As an example, in the embodiment of the present disclosure, the antireflection film 20 may be made of a titanium dioxide material.

Alternatively, the thickness of the protective film 30 is 3 μm to 5 μm. The thickness of the protective film 30 is too small, so that the protective effect is relatively small; the thickness of the protective film 30 is too large, which increases the difficulty and cost of plating.

Optionally, the material of the protective film 30 is nano silicon oxide. The material is easy to prepare into a film, and the prepared coating film has better hardness and transmittance.

Alternatively, the protective film 30 may be manufactured using a dipping process. Immersing the light guide plate into a hardening liquid containing inorganic ultrafine particles of silicon element and organic matrix, and taking out and drying to form a film. By using the soaking and drying process, a coating film can be conveniently formed on the surface of the light guide plate.

Optionally, the hardness of the protective film 30 is 1H to 3H. The surface hardness of the protective film 30 can be measured by the pencil method for measuring the hardness of the coating film. The surface hardness of traditional PC material light guide plate is 5B, through setting up protection film 30, can make the surface hardness of light guide plate promote 5 grades at least.

As an example, in the present disclosed embodiment, the surface hardness of the protective film 30 is 2H.

Alternatively, the light transmittance of the protective film 30 is not less than 90%. When the light emitted from the light guide plate body 10 passes through the protective film 30, a part of the light is absorbed by the protective film 30, and the luminance is slightly lowered. The light transmittance of the protective film 30 is set to be not less than 90%, so that the absorption of light by the protective film 30 is reduced as much as possible, and the light guide plate has sufficient brightness.

Exemplarily, in the embodiment of the present disclosure, the light transmittance of the protective film 30 is 95%.

Fig. 8 is a schematic structural diagram of a backlight assembly provided in an embodiment of the present disclosure. As shown in fig. 8, the backlight assembly includes a light source 50 and a light guide plate 40 as shown in fig. 2. The light source 50 is positioned at one side of the light guide plate 40.

In other examples, the light guide plate 40 in the backlight assembly may also be the light guide plate shown in fig. 3 or 4. The embodiment of the present disclosure will be described by taking the light guide plate 40 shown in fig. 2 as an example.

Referring to fig. 1, the light guide plate 40 has a rectangular parallelepiped shape having 6 surfaces, wherein one of the largest two surfaces is the light emitting surface 42 of the light guide plate 40. In the backlight assembly shown in fig. 6, the other surface opposite to the light emitting surface 42 is the light incident surface 41 of the light guide plate 40. When the backlight assembly is in operation, light enters from the light incident surface 41 of the light guide plate 40 and exits from the light exiting surface 42 of the light guide plate 40.

As shown in fig. 8, the light source 50 is located at the light incident surface 41 of the light guide plate 40. The light emitted from the light source 50 enters the light guide plate 40 through the light entrance surface 41 and then exits from the light exit surface 42 of the light guide plate 40.

The light source 50 may be a white LED lamp, and the LED lamp is uniformly arranged on the light incident surface 41 of the light guide plate 40, so that the overall brightness is uniform.

Fig. 9 is a schematic structural diagram of a backlight assembly provided in an embodiment of the present disclosure. As shown in fig. 9, in the backlight assembly, the side surface of the light guide plate 40 is the light incident surface of the light guide plate 40. The light source 50 is disposed at a side of the light guide plate 40. When the backlight assembly is in operation, light enters the light guide plate 40 from the side of the light guide plate 40, and then exits from the light exit surface 42 of the light guide plate 40.

Fig. 10 is a schematic structural diagram of a liquid crystal display module according to an embodiment of the disclosure. As shown in fig. 10, the liquid crystal display module includes a liquid crystal display panel 60 and a backlight assembly. The backlight assembly may be the backlight assembly shown in fig. 8 or 9.

As shown in fig. 10, the liquid crystal display panel 60 is located on the light emergent surface 42 of the light guide plate 40, and the light emitted from the light source 50 is emitted to the liquid crystal display panel 60 through the light guide plate 40.

The liquid crystal display module may further include a back frame 70, the back frame 70 being connected to the liquid crystal display panel 60, and a backlight assembly being disposed in the back frame 70 to provide support, fixing and protection for the light source 50, the backlight assembly and the light guide plate 40.

Optionally, the liquid crystal display panel 60 is fixed to the back frame 70 through adhesive tape, and is bonded through adhesive tape, so that the operation is convenient, the connection is firm, and the overall structure of the liquid crystal display module is stable.

Optionally, the liquid crystal display module may further include an optical film 80, and the optical film 80 may be at least one of a polarizer, a diffusion film, or a brightness enhancement film. By adding the optical film 80, the screen brightness can be more uniform, and the color display is accurate.

The embodiment of the disclosure also provides a liquid crystal display device, which comprises the liquid crystal display module shown in fig. 8. The liquid crystal display device can be, but is not limited to, a mobile phone, a display screen and a notebook computer.

The light transmittance of the light guide plate is improved by arranging the antireflection film on the surface of the light guide plate, so that the display brightness can meet the requirement even if a light source is driven by a small current. Through setting up the protection film, avoided in mechanical test and daily use, the light guide plate surface produces the mar to reduce the production of bad condition such as white spot or shadow, in liquid crystal display equipment, the light guide plate can set up with other inside structures of liquid crystal display equipment more closely, is favorable to reducing liquid crystal display equipment's whole thickness.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims (11)

1. A light guide plate, comprising a light guide plate body (10);

at least part of the surface of the light guide plate main body (10) is provided with an antireflection film (20) and a protective film (30), and the protective film (30) is arranged on the antireflection film (20).

2. The light guide plate according to claim 1, wherein the at least partial surface comprises at least one of:

the light guide plate comprises a first surface (11) and a second surface (12) which are perpendicular to the thickness direction of the light guide plate body (10), a light emergent surface of the light guide plate body (10) and a light incident surface of the light guide plate body (10).

3. The light guide plate according to claim 1 or 2, wherein the antireflection film (20) has a thickness of 200nm to 380 nm.

4. The light guide plate according to claim 1 or 2, wherein the antireflection film (20) is made of one of titanium dioxide, titanium oxide, aluminum oxide, and silicon dioxide.

5. The light guide plate according to claim 1 or 2, wherein the protective film (30) has a thickness of 3 μm to 5 μm.

6. The light guide plate according to claim 1 or 2, wherein the material of the protective film (30) is nano silicon oxide.

7. The light guide plate according to claim 1 or 2, wherein the protective film (30) has a hardness of 1H to 3H.

8. The light guide plate according to claim 1 or 2, wherein the protective film (30) has a light transmittance of not less than 90%.

9. A backlight assembly comprising a light guide plate (40) according to any one of claims 1 to 8 and a light source (50), wherein the light source (50) is located on one side of the light guide plate (40).

10. A liquid crystal display module comprising a liquid crystal display panel (60) and the backlight assembly of claim 9.

11. A liquid crystal display device comprising the liquid crystal display module according to claim 10.

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