CN218917871U - Reflective sheet, backlight module and liquid crystal display - Google Patents

Abstract

The utility model belongs to the field of optics, and particularly relates to a reflector plate, a backlight module and a liquid crystal display. The reflector plate aims to solve the problem that the existing reflector plate cannot provide uniform emergent light. The back light module comprises a back plate and a light source, wherein the back plate comprises a bottom plate and a side plate obliquely arranged on the periphery of the bottom plate, the reflecting plate comprises a first reflecting area and a second reflecting area positioned on the periphery of the first reflecting area, and the first reflecting area is attached to the inner side of the bottom plate; the second reflection area is attached to the side plate, a plurality of light guide protrusions are arranged on the second reflection area, and the light guide protrusions are arranged on the reflection sheet and are used for being arranged towards the light source. The light guide protrusions can diffuse the incident light, and the light incident into the light guide protrusions is reflected by the second reflection areas and then reflected by the light guide protrusions again, so that the emergent light is more uniform and has high brightness.

Description

Reflective sheet, backlight module and liquid crystal display

Technical Field

The utility model belongs to the field of optics, and particularly relates to a reflector plate, a backlight module and a liquid crystal display.

Background

Referring to fig. 1, in a backlight structure of a conventional lcd 100, the backlight structure includes a back plate 101 and a reflective sheet 102 disposed on the back plate 101, the reflective sheet 102 includes a horizontal plate and an inclined plate, the inclined plate has a certain angle with respect to the horizontal plate, and a light source 103 and a light bar 104 are disposed on the horizontal plate. The liquid crystal display 100 is further provided with a diffusion plate 105, an optical film combination 106, a liquid crystal module 107, and tempered glass 108 on the side opposite to the backlight structure. When the light source irradiates the inclined plate, the reflection sheet 102 has an inclination angle relative to the horizontal plate, so that the light emitted by the reflection sheet 102 is uneven, the middle area on the reflection sheet is brighter, the areas on the two sides of the reflection sheet are darker, and the reflection sheet cannot provide uniform emergent light.

Disclosure of Invention

The utility model aims to solve the technical problem that the reflector plate of the existing backlight module cannot provide uniform emergent light. This object is achieved in the following manner.

The first aspect of the present utility model provides a reflective sheet, which is applied to a backlight module, the backlight module includes a back plate and a light source, the reflective sheet is disposed at an inner side of the back plate and is used for receiving and reflecting light emitted by the light source, the back plate includes a bottom plate and a side plate obliquely disposed at a peripheral side of the bottom plate, the reflective sheet includes a first reflective region and a second reflective region disposed at the peripheral side of the first reflective region, wherein the first reflective region is attached to the inner side of the bottom plate; the second reflection area is attached to the side plate, a plurality of light guide protrusions are arranged on the second reflection area, and the light guide protrusions are arranged towards the light source.

Because the light guide bulge has the effect of dispersing to the incident light, set up the light guide bulge on the second reflection area and be used for towards the light source setting, thereby the light guide bulge can disperse the incident light and form diffuse reflection homogenization and the light intensity is stronger, and the light of incident to the inside of light guide bulge is reflected by the second reflection area back, is reflected by the light guide bulge again for it is more even and the light intensity is stronger to export the light.

In addition, the reflecting sheet according to the present utility model may have the following additional technical features:

in some embodiments of the present utility model, the protrusion heights of the plurality of light guide protrusions are gradually reduced from the middle to both sides along the first direction; the center distance between any two adjacent light guide protrusions along the first direction is gradually increased from the middle to the two sides.

In some embodiments of the present utility model, the plurality of light guiding protrusions form a first light guiding region and a second light guiding region, the second light guiding region includes a first light guiding sub-region and a second light guiding sub-region, the first light guiding sub-region and the second light guiding sub-region are respectively disposed on two sides of the first light guiding region along a first direction, the first light guiding sub-region is disposed close to the light source, and the second light guiding sub-region is disposed far from the light source.

In some embodiments of the present utility model, the first light guiding region includes a plurality of first light guiding protrusions, the second light guiding region includes a plurality of second light guiding protrusions, the plurality of first light guiding protrusions have a roughness greater than that of the plurality of second light guiding protrusions in the second light guiding region, and an average value of a center distance between any adjacent two of the plurality of first light guiding protrusions is smaller than an average value of a center distance between any adjacent two of the plurality of second light guiding protrusions.

In some embodiments of the utility model, the plurality of light directing protrusions comprise at least one of hemispherical, semi-ellipsoidal, inverted U-shaped in cross-section, and elliptical paraboloids.

In some embodiments of the utility model, the material of the plurality of light guiding protrusions is UV glue.

The second aspect of the present utility model provides a backlight module, including:

a reflection sheet according to the first aspect of the present utility model;

the plurality of light sources are arranged on the first reflection area.

The reflection sheet provided by the first aspect of the utility model can provide more uniform emergent light with stronger light intensity, and the backlight module comprising the reflection sheet can provide uniform emergent light with higher light intensity.

In some embodiments of the present utility model, the backlight module further includes a back plate, the back plate includes a bottom plate and a side plate obliquely disposed on a peripheral side of the bottom plate, and the first reflective area is attached to an inner side of the bottom plate; the second reflection area is attached to the side plate.

A third aspect of the present utility model provides a liquid crystal display, the liquid crystal display comprising: a liquid crystal display module; according to the backlight module of the second aspect of the utility model, the backlight module is arranged at the rear side of the liquid crystal display module.

The backlight module adopted by the liquid crystal display can provide uniform incident light, so that the display picture brightness of the liquid crystal display is higher and more uniform.

Drawings

Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the utility model. Also, like reference numerals are used to designate like parts throughout the figures. Wherein:

fig. 1 is a schematic diagram of a conventional liquid crystal display.

Fig. 2 is a schematic structural view of a light guiding structure according to an embodiment of the present utility model.

Fig. 3 is a schematic view of the astigmatism principle of the light guiding structure according to an embodiment of the present utility model.

Fig. 4 is a schematic parameter diagram of a light guiding structure according to another embodiment of the present utility model.

Fig. 5 is a schematic view of a light guiding structure according to an embodiment of the present utility model.

The reference numerals in the drawings are as follows:

1: a backlight module;

10: a reflection sheet;

11: a first reflective area 11; 12: a second reflective area 12;

20: a light source; 21: an edge light source;

30: a light guide protrusion;

31: a first light guide protrusion; 32: a second light guide protrusion;

100: a liquid crystal display;

101: a back plate; 102: reflection sheet: 103: light source: 104: a light bar; 105: diffusion plate 106: an optical film combination; 107: a liquid crystal module; 108: tempered glass.

Detailed Description

Exemplary embodiments of the present utility model will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present utility model are shown in the drawings, it should be understood that the present utility model may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the utility model to those skilled in the art.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only, and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," "includes," "including," and "having" are inclusive and therefore specify the presence of stated features, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and/or groups thereof. The method steps, processes, and operations described herein are not to be construed as necessarily requiring their performance in the particular order described or illustrated, unless an order of performance is explicitly stated. It should also be appreciated that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections should not be limited by these terms. These terms may be only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

For ease of description, spatially relative terms, such as "inner," "outer," "lower," "below," "upper," "above," and the like, may be used herein to describe one element or feature's relationship to another element or feature as illustrated in the figures. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" or "over" the other elements or features. Thus, the example term "below … …" may include both upper and lower orientations. The device may be otherwise oriented (rotated 90 degrees or in other directions) and the spatial relative relationship descriptors used herein interpreted accordingly.

Referring to fig. 2 to 5, an embodiment of the first aspect of the present utility model provides a reflective sheet 10, which is applied to a backlight module 1, wherein the backlight module 1 includes a back plate and a light source 20, the reflective sheet 10 is disposed inside the back plate and is used for receiving and reflecting light emitted by the light source 20, the back plate includes a bottom plate and a side plate obliquely disposed on a peripheral side of the bottom plate, the reflective sheet 10 includes a first reflective region 11 and a second reflective region 12 disposed on the peripheral side of the first reflective region 11, and the first reflective region 11 is adhered to the inner side of the bottom plate; the second reflection area 12 is attached to the side plate, a plurality of light guide protrusions 30 are disposed on the second reflection area 12, and the plurality of light guide protrusions 30 are disposed towards the light source.

Because the light guiding protrusion 30 has a divergent effect on the incident light, the light guiding protrusion 30 is disposed on the second reflection area 12 and is configured to face the light source 20, and the light guiding protrusion 30 can diverge the incident light to form diffuse reflection so as to be homogenized and have stronger light intensity, and after the light incident into the light guiding protrusion 30 is reflected by the second reflection area, the light is reflected by the light guiding protrusion 30 again, so that the outgoing light is more uniform and has stronger light intensity.

Referring to fig. 5, the bright and dark areas on the reflective sheet 10 are caused by: the light source 20 is disposed on the first reflective area 11, and an edge light source 21 disposed adjacent to the second reflective area 12 in the light source 20 causes an uneven brightness area on the second reflective area 12. The second reflective area 12 corresponds to the area between two adjacent edge light sources 21, and has uneven brightness from dark to light and from light to dark; the second reflection area 12 has uneven brightness from light to dark in the area opposite to the edge light source 21.

Further, first, referring to fig. 2, 3 and 5, for the area between two adjacent edge light sources 21 on the second reflection area 12, the protrusion heights of the plurality of light guiding protrusions 30 gradually decrease from the middle to both sides along the first direction L1; the center-to-center distance between any adjacent two of the light guide projections 30 in the first direction L1 is gradually increased from the middle to both sides. Because the protruding height of the light guiding protrusions 30 in the middle area is higher and denser, the scattering effect on the incident light is better, the protruding height of the light guiding protrusions 30 in the two side areas is lower and sparser, and the scattering effect on the incident light is better, so that the light guiding protrusions 30 in the middle area can scatter the incident light to the two side areas, and the emergent light of the whole reflecting sheet 10 is uniform.

The light guide protrusion 30 may be divided into a first light guide region and a second light guide region. The first light guiding region includes a plurality of first light guiding protrusions 31. The first light guiding region is a middle region of the entire light guiding protrusion in the first direction L1. In one embodiment, the plurality of first light guiding protrusions 31 are distributed in an array. The shape of the first light guide protrusion 31 is not limited as long as the outer surface thereof is a smooth curved surface and is convex as a whole. In one embodiment, the shape of the first light guiding protrusion 31 may be hemispherical, semi-ellipsoidal, or elliptical paraboloid. In one embodiment, the first light guiding protrusion 31 has an inverted U-shape in cross-section. The material of the first light guiding protrusions 31 is UV glue. Referring to fig. 4, in the first light guiding region, the roughness of the plurality of first light guiding protrusions 31 is Ra1, that is, the arithmetic mean deviation of the contour, which can be also understood as the mean value of the heights of the plurality of first light guiding protrusions 31, the mean value of the center distances between any two adjacent first light guiding protrusions 31 is Rsm1, and the mean value of the center distances between any two adjacent first light guiding protrusions 31 is the distance between the center axes of any two adjacent first light guiding protrusions 31. In the first light guiding region, ra1 is larger, rsm1 is smaller, the protrusions of the first light guiding protrusions 31 are higher, and the first light guiding protrusions 31 are distributed densely, so that the scattering effect of the first light guiding protrusions on incident light is better.

The second light guiding region includes a second light guiding protrusion 32. The second light guiding region is located at two sides of the first light guiding region in the first direction L1. In one embodiment, the plurality of second light directing protrusions 32 are distributed in an array. The shape of the second light guide protrusion 32 is not limited as long as the outer surface thereof is a smooth curved surface and is convex as a whole. In one embodiment, the shape of the second light guiding protrusion 32 may be hemispherical, semi-ellipsoidal, or elliptical paraboloid. In one embodiment, the second light guiding protrusion 32 has an inverted U-shape in cross-section. The material of the second light guiding protrusions 32 is UV glue. In the second light guiding region, the roughness of the plurality of second light guiding protrusions 32 is Ra2 (i.e., the arithmetic mean deviation of the contours), and the average value of the center distances between any adjacent two second light guiding protrusions 32 is Rsm2. In the second light guiding region, ra2 is smaller, rsm2 is larger, which is close to the plane, and the divergence effect on the light source is poor.

The second light guiding region includes a first light guiding sub-region and a second light guiding sub-region, the first light guiding sub-region and the second light guiding sub-region are respectively disposed on two sides of the first light guiding region along a first direction L1, the first light guiding sub-region is disposed close to the light source 20, and the second light guiding sub-region is disposed far away from the light source 20. Referring to fig. 2, a first direction L1 is a direction in which a connection line between the first conductive sub-region and the second conductive sub-region is located.

The first light guide area and the second light guide area can be distributed in an array as a whole, can be distributed randomly as a whole, or can be arranged in different modes. In one embodiment, the plurality of light directing protrusions 30 are arranged in an array as a whole. The shape of the light guiding protrusions in the first light guiding region and the second light guiding region may be the same or different. In one embodiment, all of the light directing protrusions 30 are semi-ellipsoidal.

Referring to fig. 2, the roughness Ra1 of the plurality of first light guiding protrusions 31 in the first light guiding region is greater than the roughness Ra2 of the plurality of second light guiding protrusions 32 in the second light guiding region, and the average Rsm1 of the center distances of any two adjacent first light guiding protrusions 31 in the first light guiding region is smaller than the average Rsm2 of the center distances of any two adjacent second light guiding protrusions 32 in the second light guiding region, so that the divergence effect of the plurality of first light guiding protrusions 31 in the first light guiding region on the incident light is better, and the divergence effect of the plurality of second light guiding protrusions 32 in the second light guiding region on the incident light is worse. In use, the first light guiding region is disposed in a region where incident light is brighter, and the second light guiding region is disposed in a region where incident light is darker, so that light incident in the first light guiding region can be dispersed into the second light guiding region to supplement the problem of insufficient light intensity in the second light guiding region, so that the whole reflective sheet 10 can provide uniform emergent light with higher light intensity.

Next, referring to fig. 5, for the area of the second reflective area 12 directly opposite to the edge light source 21, a plurality of light guiding protrusions 30 are disposed as follows: the protrusion height of the plurality of light guide protrusions 30 gradually decreases along the direction L2 from the light source to the light source, and the center-to-center distance between any adjacent two of the light guide protrusions 30 gradually becomes smaller.

Since there is a light unevenness from light to dark in the area of the second reflection area 12 directly opposite to the edge light source 21, the plurality of light guide projections 30 are provided as: along being close to light source 20 to keeping away from the direction L2 of light source 20, the protruding height of a plurality of light guide protruding reduces gradually to the centre-to-centre spacing between arbitrary adjacent two light guide protruding 30 diminishes gradually, and the light guide protruding 30 that is close to light source 20 so diverges the effect better to the incident light, and the light guide protruding 30 that is far away from light source 20 diverges the effect poorer to the incident light, makes the region that is close to light source 20 better to the effect of diverging to the incident light, thereby diverges the incident light to the region that is far away from light source 20 in order to compensate the bright defect of the region that is far away from light source 20, makes whole reflector plate 10 can provide the even emergent light that the light intensity is higher.

An embodiment of the second aspect of the present utility model provides a backlight module 1, the backlight module 1 includes:

the reflective sheet 10 according to the first aspect of the present utility model;

a plurality of light sources 20, the plurality of light sources 20 are disposed on the first reflection region 11.

Since the reflection sheet 10 emits light uniformly, the backlight unit 1 emits light uniformly.

Since the light guide protrusions 30 are made of UV glue, the UV glue can be prepared in any shape and size by means of stencil roll printing, and thus the light guide protrusions 30 can be applied to any of various display devices, whether a large-screen liquid crystal display or a small-screen office computer. In the preparation process, the reflective sheet 10 is cut first, then the plurality of UV light guiding protrusions 30 are roll printed on the first reflective region 11, and then the plurality of UV light guiding protrusions 30 are irradiated with UV light for curing. Thus, the reflection sheet 10 is easy to manufacture and has high productivity. For the liquid crystal display, the roughness Ra of the plurality of light guide protrusions 30 ranges from 0.1 micrometers to 1 micrometer, and the average value Rsm of the center distances of adjacent light guide protrusions 30 ranges from 50 micrometers to 300 micrometers.

The backlight module 1 further comprises a back plate, wherein the back plate comprises a bottom plate and side plates obliquely arranged on the periphery side of the bottom plate, and the first reflection area 11 is attached to the inner side of the bottom plate; the second reflective area 12 is attached to the side plate.

An embodiment of a third aspect of the present utility model provides a liquid crystal display, the liquid crystal display including:

a liquid crystal display module; and

according to the backlight module 1 of the second aspect of the present utility model, the backlight module 1 is disposed at the rear side of the liquid crystal display module.

The liquid crystal display further comprises a diffusion plate and an optical film combination arranged between the backlight module 1 and the liquid crystal display module. The liquid crystal display further comprises toughened glass arranged on one side of the liquid crystal module, which is far away from the backlight module 1.

The liquid crystal display provided by the utility model adopts the backlight module 1 according to the second aspect of the utility model, and the backlight module 1 can provide uniform incident light, so that the display picture brightness of the liquid crystal display is higher and more uniform.

The present utility model is not limited to the above-mentioned embodiments, and any changes or substitutions that can be easily understood by those skilled in the art within the technical scope of the present utility model are intended to be included in the scope of the present utility model. Therefore, the protection scope of the utility model is subject to the protection scope of the claims.

Claims (10)

1. The back light module comprises a back plate and a light source, wherein the back plate comprises a bottom plate and a side plate obliquely arranged on the periphery side of the bottom plate, and the back plate is characterized by comprising a first reflection area and a second reflection area positioned on the periphery side of the first reflection area, wherein the first reflection area is attached to the inner side of the bottom plate; the second reflection area is attached to the side plate, a plurality of light guide protrusions are arranged on the second reflection area, and the light guide protrusions face the light source.

2. The reflective sheet according to claim 1, wherein the plurality of light guide protrusions have a protrusion height gradually decreasing from the middle to both sides in the first direction; the center distance between any two adjacent light guide bulges is gradually increased from the middle to the two sides along the first direction.

3. The reflective sheet of claim 2 wherein said plurality of light guiding protrusions form a first light guiding region and a second light guiding region, said second light guiding region comprising a first light guiding sub-region and a second light guiding sub-region, said first light guiding sub-region and said second light guiding sub-region being disposed on opposite sides of said first light guiding region along said first direction, respectively, and said first light guiding sub-region being disposed proximate to said light source, and said second light guiding sub-region being disposed distal to said light source.

4. The reflective sheet of claim 3, wherein the first light guiding region comprises a plurality of first light guiding protrusions, the second light guiding region comprises a plurality of second light guiding protrusions, the plurality of first light guiding protrusions have a roughness greater than a roughness of the plurality of second light guiding protrusions in the second light guiding region, and an average of center distances between any adjacent two of the plurality of first light guiding protrusions is less than an average of center distances between any adjacent two of the plurality of second light guiding protrusions.

5. The reflective sheet according to claim 1, wherein the plurality of light guide protrusions gradually decrease in protrusion height in a direction from approaching the light source to separating from the light source, and a center-to-center distance between any adjacent two of the light guide protrusions gradually becomes smaller.

6. The reflective sheet of claim 1 wherein said plurality of light guiding protrusions comprise at least one of hemispherical, semi-ellipsoidal, inverted U-shaped in cross-section and elliptical paraboloids.

7. The reflective sheet of claim 1 wherein the material of the plurality of light guiding protrusions is UV glue.

8. The utility model provides a backlight unit which characterized in that, backlight unit includes:

the reflective sheet according to any one of claims 1 to 7;

a plurality of light sources disposed on the first reflective region.

9. The backlight module according to claim 8, further comprising a back plate, wherein the back plate comprises a bottom plate and a side plate obliquely arranged on the peripheral side of the bottom plate, and the first reflection area is attached to the inner side of the bottom plate; the second reflection area is attached to the side plate.

10. A liquid crystal display, the liquid crystal display comprising:

a liquid crystal display module;

a backlight module according to any one of claims 8-9, which is arranged at the rear side of the liquid crystal display module.

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