CN203825226U - Light guide plate, backlight module and display apparatus - Google Patents

Abstract

The utility model provides a light guide plate, a backlight module and a display device. The light guide plate includes a light-emitting surface, a bottom surface opposite to the light-emitting surface, and a side surface intersecting the light-emitting surface and the bottom surface. The side surface includes a first side surface and a The second side serving as the light incident surface of the light guide plate is characterized in that the angle between the first side and the bottom surface is less than 90 degrees. In the light guide plate provided by the utility model, the angles between the sides and the bottom surface except the light incident surface are all less than 90 degrees, so that the other sides of the light guide plate except the light incident side are wedge-shaped, thereby increasing the scattering area of the bottom surface of the light guide plate, The light can be emitted uniformly through the corresponding side, reducing the probability of total reflection of the light at the edge, reducing the amount of light overlap, so that the local brightness increase caused by repeated refraction of the light group can be effectively avoided without changing the masking area of the light-shielding tape, and then It can effectively reduce the incidence of optical bright lines around the edges of the backlight module.

Description

Light guide plate, backlight module and display device

technical field

The utility model relates to the display field, in particular to a light guide plate, a backlight module and a display device.

Background technique

Liquid crystal displays have the advantages of small size, low power consumption, and low radiation, and have been widely used in equipment such as computer monitors, notebook computers, mobile phones, and LCD TVs. Since the display panel of the liquid crystal display does not emit light itself, a backlight module is required to provide a light source for it. At present, the main components of the backlight module include a light source, a reflector, a light guide plate, an optical film, a plastic frame, and a back plate. The backplane 2', reflective sheet 3', light guide plate 4' and optical film material 5' arranged in sequence in the frame 1' are provided with a light-shielding tape (tape) 6' around the optical film material 5' of the backlight module. The light-shielding tape 6' absorbs or reflects light, thereby shielding the surrounding bright lines of the backlight module. However, when the overlap between the light-shielding tape 6' and the optical film material 5' is insufficient, the backlight module is in the lighted state. , when observed at a certain oblique angle, the problem of "bright lines" still appears, which is due to the phenomenon of light gathering and repeated refraction and overlapping when the light group is totally reflected in the light guide plate to the edge of the light guide plate, and the leakage of light from the light guide plate The light from the light is reflected back to the light guide plate by the plastic frame to undergo total reflection. Specifically, referring to FIG. Total reflection occurs when the incident angle θ' of the light on the side 43' of the light guide plate is greater than 42 degrees, and the reflected light is emitted through the light-emitting surface 42', thereby increasing the number of light propagation paths of the same bright spot, that is, the overlapping of light rays per unit area As a result, the brightness of the area is significantly enhanced, forming a large brightness difference with the edge of the near area of the light-shielding tape, and then entering the visual angle of the human eye to produce a visually striking "bright line" phenomenon.

In order to further solve the above problems, the length of the light-shielding tape can be increased on the backlight structure, see Figure 3, so as to increase the overlapping amount of the light-shielding tape 6', the optical film material 5', and the light guide plate 4', thereby maximizing the Shading the edge of the light guide plate may produce bright lines. However, increasing the length of the light-shielding tape will lead to a decrease in light energy utilization, which is not conducive to the realization of narrow frames, and cannot essentially solve the "bright line" phenomenon.

Utility model content

(1) Technical problems to be solved

The technical problem to be solved by the utility model is to provide a light guide plate, a backlight module and a display device, which can reduce the occurrence rate of optical bright lines around the edges of the backlight module.

(2) Technical solution

In order to solve the above-mentioned technical problems, the technical solution of the present utility model provides a light guide plate, which includes a light-emitting surface, a bottom surface opposite to the light-emitting surface, and a side surface intersecting the light-emitting surface and the bottom surface, and the side surface includes a second One side and a second side serving as the light incident surface of the light guide plate, wherein the angle between the first side and the bottom surface is less than 90 degrees.

Further, the angle between the second side surface and the bottom surface is 90 degrees, and the angle between the first side surface and the bottom surface is 30 degrees to 80 degrees.

In order to solve the above-mentioned technical problems, the utility model also provides a backlight module, including any one of the above-mentioned light guide plates.

Further, it also includes a rubber frame arranged around the light guide plate, the rubber frame includes a first inner surface opposite to the first side, and the first inner surface is arranged parallel to the first side.

Further, the first inner surface is covered with a black light-absorbing strip.

In order to solve the above-mentioned technical problems, the utility model also provides a display device, including any one of the above-mentioned backlight modules.

(3) Beneficial effects

In the light guide plate provided by the utility model, the angles between the sides and the bottom surface except the light incident surface are all less than 90 degrees, so that the other sides of the light guide plate except the light incident side are all wedge-shaped, thereby increasing the bottom scattering area of the light guide plate, The light can be emitted uniformly through the corresponding side, reducing the probability of total reflection of light at the edge, reducing the amount of light overlap, so that the local brightness increase caused by repeated refraction of the light group can be effectively avoided without changing the shading area of the light-shielding tape, and then It can effectively reduce the incidence of optical bright lines around the edges of the backlight module.

Description of drawings

Fig. 1 is a schematic diagram of a backlight module in the prior art;

Fig. 2 is a schematic diagram of a light guide plate in the prior art;

3 is a schematic diagram of another backlight module in the prior art;

4 to 6 are schematic diagrams of a light guide plate provided by an embodiment of the present invention;

Fig. 7 is a schematic diagram of another light guide plate provided by the embodiment of the present invention;

Fig. 8 is a schematic diagram of a backlight module provided by an embodiment of the present invention.

Detailed ways

Below in conjunction with accompanying drawing and embodiment, the specific embodiment of the utility model is described in further detail. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.

The embodiment of the utility model provides a light guide plate, which includes a light-emitting surface, a bottom surface opposite to the light-emitting surface, and a side surface intersecting the light-emitting surface and the bottom surface, and the side surface includes a first side and is used as the The second side of the light incident surface of the light guide plate, wherein the angle between the first side and the bottom surface is less than 90 degrees.

Referring to FIG. 4, FIG. 5 and FIG. 6, the light guide plate 4 includes a light-emitting surface 41, a bottom surface 42 opposite to and parallel to the light-emitting surface 41, and a side surface intersecting the light-emitting surface 41 and the bottom surface 42, specifically, the side surface of the light guide plate Including the first side 43, the first side 44, the first side 46 and the second side 45 used as the light incident surface of the light guide plate, wherein the second side is perpendicular to the bottom surface, the first side 43, the first side 44, the first The included angles between the side surface 46 and the bottom surface are all less than 90 degrees.

Specifically, referring to FIG. 7 , inside the structure of the light guide plate, the angle λ between the first side 43 and the bottom surface 42 is less than 90 degrees, and the light in the light guide plate 4 is reflected to the first side 43 through the dots 421 on the bottom surface 42 . The outgoing angle θ of the light on the side 43' is less than θ' (θ' is the incident angle of the corresponding light on the first side 43 when the angle between the first side 43 and the bottom 42 is equal to 90 degrees), compared with the angle between the first side and the bottom For the light guide plate with an included angle equal to 90 degrees, the light in the light guide plate is more likely to be led out from the first side, thereby avoiding the local strengthening of the light caused by total reflection on the first side.

Preferably, the included angle between the second side surface 45 used as the light incident surface and the bottom surface 42 is 90 degrees, and the included angle λ between the first side surface 43 and the bottom surface 42 is 30 degrees to 80 degrees, for example, λ can be 45 degrees or 55 degrees , 65 degrees, etc.

In the light guide plate provided by the embodiment of the utility model, the angles between the side and the bottom surface except the light incident surface are all less than 90 degrees, so that the other sides of the light guide plate except the light incident side are all wedge-shaped, thereby increasing the scattering of the bottom surface of the light guide plate. Area, so that the light can be uniformly emitted through the corresponding side, reduce the probability of total reflection of light at the edge, and reduce the amount of light overlap, so that the partial brightness increase caused by repeated refraction of the light group can be effectively avoided without changing the masking area of the shading tape. , thereby effectively reducing the occurrence rate of optical bright lines around the edges of the backlight module.

The embodiment of the present utility model also provides a backlight module, including the above-mentioned light guide plate.

Referring to Fig. 8, Fig. 8 is a schematic diagram of a backlight module provided by an embodiment of the present invention. The backlight module includes a plastic frame 1, a backplane 2 arranged in sequence inside the plastic frame 1, a reflection sheet 3, and a light guide plate 4 And optical film material 5, the optical film material 5 periphery of backlight module is provided with light-shielding tape (tape) 6, and light guide plate 4 comprises light-emitting surface, the bottom surface that is opposite and parallel with light-emitting surface, and all intersects with light-emitting surface and bottom surface The first side 43, the angle between the first side 43 and the bottom surface is less than 90 degrees, in addition, the plastic frame 1 includes a first inner surface 11 opposite to the first side 43, the first inner surface 11 and the The first side surfaces 43 are arranged in parallel. Specifically, the light guide plate and the plastic frame can be treated with wedge-shaped angles on all three sides except the light-incident side, and the two can be assembled according to the normal lugs, so that the probability of total reflection of the light group at the edge of the light guide plate can be further reduced. Increase the number of light emitted from the edge of the light guide plate to avoid local strengthening of the light caused by the total reflection of the light group at the edge.

Preferably, a black light-absorbing tape can be covered on the first inner surface 11, wherein the black light-absorbing tape can be a black single-sided adhesive tape (tape), and the black light-absorbing tape can effectively absorb the light emitted by the first side 43 to avoid The light is reflected by the plastic frame back to the light guide plate, causing the edge brightness to increase, and then comprehensively realizes the improvement and prevention of optical defects such as "bright lines", and improves the display quality.

In the backlight module provided by the embodiment of the present utility model, the included angles between the sides and the bottom of the light guide plate except the light incident surface are all less than 90 degrees, so that the other sides of the light guide plate except the light incident side are wedge-shaped, thereby increasing the The scattering area of the bottom surface of the light guide plate enables the light to exit uniformly through the corresponding side, reduces the probability of total reflection of the light at the edge, and reduces the amount of light overlap, so that it can effectively avoid repeated light groups without changing the shading area of the light-shielding tape. Refraction leads to an increase in local brightness, which can effectively reduce the incidence of optical bright lines around the edges of the backlight module; in addition, the plastic frame is sloped at the corresponding position to match the wedge-shaped part of the light guide plate. While reducing the amount of materials, Maximize the use of the space at the edge of the backlight module to facilitate the realization of a narrow frame design; moreover, a black light-absorbing strip is added to the corresponding inner surface of the plastic frame to absorb the leaked light as effectively as possible, and then comprehensively realize the "bright line" Improve and prevent optical defects to achieve the purpose of improving display quality.

The embodiment of the present utility model also provides a display device, including the above-mentioned backlight module. Wherein, the above-mentioned display device may be any product or component with a display function such as a notebook computer display screen, electronic paper, an organic light-emitting diode display, a liquid crystal display, a liquid crystal TV, a digital photo frame, a mobile phone, and a tablet computer.

The above embodiments are only used to illustrate the utility model, but not to limit the utility model. Those of ordinary skill in the relevant technical fields can also make various changes and modifications without departing from the spirit and scope of the utility model. , so all equivalent technical solutions also belong to the category of the utility model, and the patent protection scope of the utility model should be defined by the claims.

Claims (6)

1. a light guide plate, comprise exiting surface, the bottom surface relative with described exiting surface, and with the equal crossing side in described exiting surface and bottom surface, described side comprises the first side and the second side that is used as described light guide plate incidence surface, it is characterized in that, the angle of described the first side and described bottom surface is less than 90 degree.

2. light guide plate according to claim 1, is characterized in that, the angle of described the second side and described bottom surface is 90 degree, and the angle of described the first side and described bottom surface is 30 degree～80 degree.

3. a backlight module, is characterized in that, comprises the light guide plate as described in as arbitrary in claim 1 to 2.

4. backlight module according to claim 3, is characterized in that, also comprises and is arranged on described light guide plate glue frame around, and described glue frame comprises first inside surface relative with described the first side, described the first inside surface and described the first parallel sided setting.

5. backlight module according to claim 4, is characterized in that, on described the first inside surface, is coated with black light-absorbing band.

6. a display device, is characterized in that, comprises the backlight module as described in as arbitrary in claim 3 to 5.