CN109375415B

CN109375415B - Backlight module of narrow-frame display screen

Info

Publication number: CN109375415B
Application number: CN201811237671.4A
Authority: CN
Inventors: 郑净远
Original assignee: Huizhou China Star Optoelectronics Technology Co Ltd
Current assignee: Huizhou China Star Optoelectronics Technology Co Ltd
Priority date: 2018-10-23
Filing date: 2018-10-23
Publication date: 2020-03-24
Anticipated expiration: 2038-10-23
Also published as: WO2020082622A1; CN109375415A

Abstract

The invention provides a backlight module, which is characterized in that a light inlet and a light outlet are arranged on a rubber frame, wherein the light inlet is arranged on one side, close to a light source, of the rubber frame and adjacent to a plane where the light source is located, the light outlet is arranged at the top of the rubber frame, the light inlet is communicated with the light outlet, particularly, the height of the light inlet and the width of the light outlet are half of the width of a dark shadow area at the edge of a panel, the position of the light inlet is also related to the position of the nearest LED point light source, and the design can ensure that light of the light source is reflected to the dark shadow area at the edge of the panel through the light inlet and the light outlet in sequence, so that dark bands existing at the periphery of an operable area of a narrow-frame screen are improved.

Description

Backlight module of narrow-frame display screen

Technical Field

The invention relates to the technical field of display, in particular to a structure of a display screen, and particularly relates to a backlight module.

Background

In the display field, the quality of the backlight module determines the quality of the display effect of the display screen. The spliced screen is used in many large-scale occasions to display pictures to meet the requirement of watching by many people, but the mainstream splicing seam (the distance from the operation area to the frame) of the spliced screen is too narrow and small and is only 3.5 mm, so that the peripheral edge of the panel operation area can be changed into a dark zone due to the fact that light cannot reach, and the image quality of the screen is reduced, as shown in fig. 2.

In summary, the peripheral edge of the operable area of the narrow-frame screen in the prior art has a dark band problem, which affects the image quality of the screen.

Disclosure of Invention

To solve the above problems, the present invention provides a backlight module, at least comprising:

the backlight module comprises a rubber frame, a back plate arranged at the bottom of the rubber frame, a diffusion plate arranged at the top of the rubber frame, and light sources distributed between the back plate and the diffusion plate;

the diffusion plate comprises a bright surface area and a bonding area positioned at the edge of the bright surface area, and the bonding area of the diffusion plate is bonded and fixed with the surface of the rubber frame;

in the backlight module of this application, be close to in the gluey frame the light source, and with the light source place one side adjacent has been seted up into the light mouth, glue the frame top and seted up the light-emitting window, go into the light mouth with the light-emitting window intercommunication, in order to realize the light of light source glue the frame inner wall reflection extremely bonding region, in order to promote bonding region's luminance.

In the backlight module of the present application, the height of the light inlet is one half of the width of the bonding region, and the width of the light outlet is one half of the width of the bonding region.

In the backlight module of the present application, the plane of the light inlet is perpendicular to the plane of the light source, the perpendicular distance between the light inlet and the plane of the light source is a first distance, the perpendicular distance between the light source and the plane of the light inlet is a second distance, and the ratio of the first distance to the second distance is tan (30 ° ± 5 °).

In the backlight module of the present application, the light outlet is disposed at any position where the top of the plastic frame and the diffusion plate are not in contact.

In the backlight module of the application, the length of the light inlet and the length of the light outlet are both smaller than the length of the side edge of the corresponding rubber frame.

In the backlight module of the application, the rubber frame is a hollow frame body, and the diffuse reflection surface is arranged inside the rubber frame.

In the backlight module of this application, it is solid framework to glue the frame, it is provided with the light passageway to glue in the frame, the one end of light passageway does go into the light mouth, the relative other end of light passageway does go out the light mouth.

In the backlight module of this application, in the solid framework the light channel sets up and is called one section sharp line passageway, sharp line passageway with glue the frame top orientation the contained angle of that side of light source is the acute angle.

In the backlight module of the application, the light channel at least comprises two end section linear channels, the first section linear channel is connected with the light outlet, and the first section linear channel is vertical to the top of the rubber frame.

In the backlight module of the present application, the light channel at least includes a section of curved channel.

The technical scheme of the invention can produce the following effects:

compared with the prior art, the backlight module provided by the invention has the following differences: the backlight module is characterized in that one side, close to the light source and adjacent to the plane where the light source is located, of a rubber frame of the backlight module is provided with a light inlet, the top of the rubber frame is provided with a light outlet, the light inlet is communicated with the light outlet, the height of the light inlet is half of the width of the bonding area, the width of the light outlet is half of the width of the bonding area, the position of the light inlet is also required, and finally light of the light source can be reflected to a dark zone at the edge of the panel through the light inlet and the light outlet in sequence, so that the brightness of the dark zone of the narrow frame is improved, the width of the dark zone is reduced, and better picture experience is brought to users.

Drawings

The invention is further illustrated by the following figures. It should be noted that the drawings in the following description are only for illustrating some embodiments of the invention, and that other drawings may be derived from those drawings by a person skilled in the art without inventive effort.

FIG. 1 is a schematic cross-sectional view illustrating a direct type backlight module according to the prior art.

FIG. 2 is a schematic diagram illustrating the effect of dark band in a direct-type backlight module in the prior art.

Fig. 3 is a schematic cross-sectional view illustrating a structure of a direct-type backlight module according to an embodiment of the invention.

Fig. 4 is a schematic cross-sectional view illustrating a structure of a direct type backlight module according to another embodiment of the present invention.

Fig. 5 is a schematic diagram illustrating an effect of a dark band region in a direct-type backlight module according to an embodiment of the invention.

Detailed Description

The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. 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.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "inner", "outer", "surface", "vertical", and the like indicate orientations or positional relationships based on the drawings, wherein "upper" and "lower" are only surfaces above objects, specifically refer to directly above, obliquely above, and upper surfaces, as long as they are above the object level, and "surface" is used to indicate that two objects are in direct contact with each other, and the above orientations or positional relationships are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.

It should be noted that the terms "thickness", "width" and "length" are neutral words and do not mean a bias towards being thick or thin, wide or narrow, and the term "preset" is used herein to mean only a thickness, width or length of an object at a certain distance, and the numerical value is uncertain, but will depend on the actual situation. Furthermore, the letters "H", "P" and "D" are respectively used to indicate a certain numerical value, and because of the present incompleteness, the letters are only expressed by letters first, and are intended to indicate the numerical value and distance relationship between the related objects or positions.

It should be noted that the drawings only provide the structures and/or steps which are relatively closely related to the present invention, and some details which are not related to the present invention are omitted, so as to simplify the drawings and make the present invention clear, but not to show that the actual devices and/or methods are the same as the drawings and are not limitations of the actual devices and/or methods.

Referring to fig. 1, which is a schematic cross-sectional view illustrating a structure of a direct type backlight module in the prior art, it can be seen from fig. 1 that light rays emitted from a light source 104 disposed on a back plate (not shown) of a plastic frame 103 are reflected to an intermediate portion of a diffusion plate 102 and the plastic frame 103, which is not in contact with each other, due to blocking of a side surface of the plastic frame 103, that is, the light from the light source 106 is finally reflected to the panel 101 uniformly, and the portion of the diffusion plate 102 adhered to the adhesive frame 103 is finally formed with a dark band 105 with a certain width around the panel 101 because the light cannot be reflected, as shown in the schematic diagram of the effect of the dark band in the direct type backlight module in the prior art in fig. 2, where the edge light indicates a lower brightness, it can be observed that the width of the dark band 105 (i.e., the edge light area of fig. 2) is larger and the light is less in the prior art.

Referring to fig. 3, a schematic cross-sectional view of a direct type backlight module according to an embodiment of the present invention is shown, the backlight module at least includes a plastic frame 303, a back plate (not shown) disposed at the bottom of the plastic frame 303, a diffuser plate 302 disposed at the top of the plastic frame 303, and a plurality of light sources 304 disposed between the back plate and the diffuser plate 302, a panel 301 is disposed above the diffuser plate 302, and the peripheral length of the panel 301 exceeds the peripheral length of the diffuser plate 302.

The area where the diffusion plate 302 is bonded to the top surface of the rubber frame 303 is defined as a bonding area, and the other areas of the diffusion plate 302 are defined as bright areas.

As shown in fig. 3, the rubber frame 303 in the figure is a hollow frame body, each side of the rubber frame 303 has a certain thickness, in this embodiment, compared with the prior art, a light inlet 307 is formed in one side of the rubber frame 303, which is close to the light source 304 and adjacent to a plane where the light source 304 is located, and a light outlet 306 is formed in the top of the rubber frame, wherein each light inlet 307 and each light outlet 306 are in one-to-one correspondence.

Here, for any one of the obscuration bands 305 (bonding regions), assuming that the width of the obscuration band 305 (bonding region) is D, the height of the light inlet 307 should be set to be one half of the width of the obscuration band 305 (bonding region), and the width of the light outlet 306 should be one half of the width of the obscuration band 305 (bonding region). Here, if the height of the light inlet 307 and the width of the light outlet 306 are larger than D/2, the edge brightness is too high, and smaller than D/2, the poor dark effect can be solved, so that it is a better choice to set the height of the light inlet 307 and the width of the light outlet 306 to D/2, such a size design changes the originally completely opaque region (0%) of the dark band 307 into at least a slight supplementary light (+ 20%), and the actual improvement effect is much larger than 20%.

Specifically, the position of the light inlet 307 on the rubber frame 303 is defined as follows:

the rubber frame 303 has a plurality of vertical surfaces, wherein any vertical surface is provided with a light inlet 307, and a plane of the light inlet 307 is perpendicular to a plane of the light source 304. Assuming that the perpendicular distance between the light entrance 307 and the surface where the light source 304 is located is defined as P, and the perpendicular distance between the light entrance 307 and the surface where the light source 304 is located is defined as H, the above H, P should satisfy the relationship of H/P tan (30 ° ± 5 °), among all the light sources 304.

Similarly, for the backlight module, the position of each light inlet 307 and the corresponding H, P should comply with the above-mentioned regulations.

In addition, the light outlet 306 is disposed at any position of the top of the plastic frame 303 where the diffusion plate 302 and the plastic frame 303 are not in contact with each other, and the width difference between the edges of the panel 301 and the diffusion plate 302 is small and is only about 3.5 mm in practice, so the distance between the light outlet 306 and the diffusion plate 302 does not need to be considered.

It should be understood that, in order to enable the light of the light source 306 to sequentially pass through the light inlet 307 and the light outlet 306 and be reflected to the obscuration band 305 (the bonding region), the thicknesses of the light inlet 307 and the light outlet 306 should be based on the thickness of the sidewall passing through the corresponding glue frame 303.

It should be noted that fig. 3 is a schematic cross-sectional view of a structure of a direct-type backlight module according to an embodiment of the present invention, in practice, the light inlet 307 and the light outlet 306 have a certain length, and the length of the light inlet 307 and the light outlet 306 must be greater than or equal to the length of the corresponding dark band 305 (bonding area) to ensure that the brightness of the entire length of the dark band 305 (bonding area) can be improved; moreover, the lengths of the light inlet 307 and the light outlet 306 are both smaller than the length of the corresponding side edge of the rubber frame 303, otherwise, the side frame of the rubber frame 303 is split into a plurality of separate parts by the light inlet 307 and the light outlet 306, and the normal rubber frame 303 cannot be formed to realize the functions of reflection and the like of the normal rubber frame 303, which should be understood.

As described above, in the embodiment of fig. 3, most of the light emitted from the light source 304 on the back plate of the plastic frame 303 directly strikes the diffusion plate 302 or is reflected to the diffusion plate 302 by the inner surface of the plastic frame 303, and a part of the light of the nearest LED point light source 304 sequentially passes through the light inlet 307 and the light outlet 306 and is reflected to the shadow area 305 on the edge of the panel 301, i.e., the light in the area with high light intensity is transferred to the area with low light intensity, thereby improving the image quality of the shadow area 305. Specifically, the improvement of the light of the obscuration band 305 can be referred to fig. 5, in fig. 5, the gray scale becomes deeper, which indicates that the brightness is increased, that is, the intensity of the light becomes stronger, so that the image quality around the final screen is improved.

Fig. 4 is a schematic cross-sectional view illustrating a structure of a direct type backlight module according to another embodiment of the present invention, which is different from the backlight module shown in fig. 3 in that a rubber frame 403 of the backlight module shown in fig. 4 is a solid frame, and the differences between the embodiment shown in fig. 4 and the embodiment shown in fig. 3 will be described in detail.

In fig. 4, the area where the diffusion plate 402 is bonded to the top surface of the rubber frame 403 is defined as a bonding area, and the other area of the diffusion plate 402 is defined as a bright area.

In the backlight module, the rubber frame 403 is also provided with a light inlet 407 and a light outlet 406, and since the rubber frame 403 is solid, a light channel is provided inside the rubber frame 403, one end of the light channel is the light inlet 407, and the other end of the light channel is the light outlet 406.

The dimensions and the positions of the light inlet 407 and the light outlet 406 are the same as those in the embodiment corresponding to fig. 3.

The optical channel in fig. 4 is provided as two sections of linear channels, the first section of linear channel is connected to the light outlet 406, the first section of linear channel is perpendicular to the top of the rubber frame 403, and the second section of linear channel is connected to the light inlet 407.

As described above, the light from the light source 404 passes through the light inlet 407 and the light outlet 406 in sequence, and the light is reflected multiple times on the inner wall of the light channel and finally reflected to the dark band 405 (bonding area) of the panel 401.

For the case that the plastic frame is solid, in addition to the embodiment shown in fig. 4, the light channel may also be a straight channel, where an included angle between the straight channel and the side of the top of the plastic frame facing the light source is an acute angle; the optical channel can also be arranged as one or more sections of curved channels or channels matched by mixing straight lines and curves.

It should be understood that, regardless of the shape and path of the light channel, the principle is to utilize multiple reflections of light to transfer part of the light from the light source 404 to the obscuration band 405 (bonding region) on the panel 401, thereby improving the obscuration band around the periphery of the operable area of the narrow-frame screen.

The effect graphs generated by adopting the above embodiments when the rubber frame is solid are all shown in fig. 5.

The structure and the position relationship of the backlight module with the narrow frame provided by the embodiment of the invention are described in detail, a specific example is applied in the description to explain the principle and the implementation mode of the invention, and the description of the embodiment is only used for helping to understand the technical scheme and the core idea of the invention; those of ordinary skill in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.

Claims

1. A backlight module at least comprises:

the light source is arranged in the glue frame, the glue frame is provided with a light inlet, the light inlet is communicated with the light outlet, and light of the light source is reflected to the bonding area through the inner wall of the glue frame so as to improve the brightness of the bonding area.

2. The backlight module of claim 1, wherein: the height of the light inlet is one half of the width of the bonding area, and the width of the light outlet is one half of the width of the bonding area.

3. The backlight module of claim 1, wherein: the surface of the light inlet is perpendicular to the surface of the light source, the perpendicular distance between the light inlet and the surface of the light source is a first distance, the perpendicular distance between the light source and the surface of the light inlet is a second distance, and the ratio of the first distance to the second distance is tan (30 degrees +/-5 degrees).

4. The backlight module of claim 1, wherein: the light outlet is arranged at any position where the top of the rubber frame is not in contact with the diffusion plate.

5. The backlight module of claim 1, wherein: the lengths of the light inlet and the light outlet are smaller than the lengths of the corresponding side edges of the rubber frame.

6. The backlight module according to any of claims 1-5, wherein: the rubber frame is a hollow frame body, and a diffuse reflection surface is arranged inside the rubber frame.

7. The backlight module according to any of claims 1-5, wherein: the glue frame is a solid frame body, a light channel is arranged in the glue frame, one end of the light channel is the light inlet, and the other opposite end of the light channel is the light outlet.

8. The backlight module of claim 7, wherein: the light channel is set to be a section of linear channel, and an included angle between the linear channel and the side, facing the light source, of the top of the rubber frame is an acute angle.

9. The backlight module of claim 7, wherein: the optical channel at least comprises two sections of linear channels, wherein the first section of linear channel is connected with the light outlet, and the first section of linear channel is perpendicular to the top of the rubber frame.

10. The backlight module of claim 7, wherein: the light channel at least comprises a section of curve channel.