CN117761815A - Diffusion sheet structure, display module and display device - Google Patents

Abstract

The application provides a diffusion sheet structure, a display module and a display device, which belong to the technical field of display equipment, wherein the diffusion sheet structure comprises a substrate layer and a first base layer arranged on one side of the substrate layer, and a plurality of diffusion particles with irregular particle sizes are distributed on the first base layer; the prism layer is adhered to the substrate layer through the adhesive layer; or, the prism layer is adhered to the side of the first base layer away from the substrate layer through an adhesive layer; wherein, the prismatic peak of the prism layer is arranged towards the substrate layer. The diffusion sheet structure that this application provided utilizes the bond line bonding prism layer on the structural basis of correlation technique, and the prism layer can promote light utilization ratio and luminance gain, simultaneously, bonds first basic layer and forms the structure of multilayer film complex, can utilize first basic layer to improve the uneven problem of luminance that the prism layer brought again, is favorable to making diffusion sheet structure be applicable to in the wider application scene.

Description

Diffusion sheet structure, display module and display device

Technical Field

The application relates to the technical field of display equipment, in particular to a diffusion sheet structure, a display module and a display device.

Background

The diffuser structure, which is one of the main components of the side-entry backlight, mainly serves to correct the propagation direction of light emitted from the light guide plate and to provide a more uniform optical effect.

At present, related manufacturers propose adding a prism layer with a downward prism surface in a diffusion sheet structure, and collecting light rays of a light guide plate by utilizing the refraction effect of the prism layer, so as to improve the light ray utilization rate and brightness gain.

Disclosure of Invention

Accordingly, an object of the present invention is to provide a diffusion sheet structure, a display module and a display device, so as to improve the technical problem of uneven brightness caused by a prism layer under the premise of ensuring brightness gain.

Based on the above object, the present application provides a diffusion sheet structure comprising:

the substrate comprises a substrate layer and a first base layer arranged on one side of the substrate layer, wherein a plurality of diffusion particles with irregular particle sizes are distributed on the first base layer;

a prism layer bonded to the substrate layer by an adhesive layer; or, the prism layer is adhered to the side of the first base layer away from the substrate layer through an adhesive layer; the first base layer is configured to receive light and then project the light to the prism layer.

Further, the method further comprises the following steps:

the second base layer is arranged on one side, far away from the bonding layer, of the prism layer, and a plurality of diffusion particles with irregular particle sizes are distributed on the second base layer.

Further, the prism layer is adhered to one side, far away from the substrate layer, of the first base layer through the adhesive layer, and a protective layer is further arranged on one side, far away from the first base layer, of the substrate layer.

Further, the prism layer is bonded to the substrate layer by an adhesive layer, and the first base layer is located on a side of the substrate layer facing away from the prism layer.

Further, the first base layer and/or the second base layer adopts one of the following materials: resins, polymethyl methacrylate and polycarbonates.

Further, the prism layer comprises a prism base layer and a plurality of prism bodies arranged on the prism base layer, and the prism peaks of the plurality of prism bodies are arranged towards the bonding layer.

Further, the base material layer and the prism base layer are made of the same material.

Further, the thickness of the base material layer is 20 μm to 30 μm.

Based on the same inventive concept, the application also provides a display module, which comprises the diffusion sheet structure as described in any one of the above.

Based on the same inventive concept, the application also provides a display device, which comprises the display module.

As can be seen from the above, the diffusion sheet structure provided by the present application uses the adhesive layer to adhere the prism layer on the basis of the structure of the related art, and because the prism peak of the prism layer is disposed towards the substrate layer, the refraction effect of the prism layer is used to collect the outgoing light beam, so as to improve the light utilization rate and brightness gain; meanwhile, the first base layer is bonded to form a multi-layer film composite structure, the problem of uneven brightness caused by the prism layer can be improved by using diffusion particles distributed on the first base layer, the scene limitation of needing larger A/P value is eliminated, and the diffusion sheet structure is beneficial to being suitable for wider application scenes.

Drawings

In order to more clearly illustrate the technical solutions of the present application or related art, the drawings that are required to be used in the description of the embodiments or related art will be briefly described below, and it is apparent that the drawings in the following description are only embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort to those of ordinary skill in the art.

FIG. 1 is a schematic structural diagram of a diffuser structure (A) according to an embodiment of the present application;

FIG. 2 is a schematic structural level diagram of a diffusion sheet structure (B) according to the related art in an embodiment of the present application;

FIG. 3 is a schematic structural hierarchy of an exemplary diffuser structure of the present application;

FIG. 4 is a schematic structural hierarchy of an exemplary diffuser structure of the present application;

FIG. 5 is a schematic structural hierarchy of an exemplary diffuser structure of the present application;

FIG. 6 is a schematic structural hierarchy of an exemplary diffuser structure of the present application;

FIG. 7 is a graph showing the gain of different diffusion layers according to the embodiment of the present application;

fig. 8 is a light-emitting pattern diagram of the light guide plate in the embodiment of the application;

FIG. 9 is a prismatic view of an exemplary prismatic layer according to an embodiment of the present disclosure;

FIG. 10 is a graph of matching light patterns of a diffuser structure (A) and a prismatic layer according to an embodiment of the present application;

FIG. 11 is a graph of matching light patterns of a diffuser structure (B) and a prism layer in an embodiment of the present application;

fig. 12 is a matching light pattern diagram of a diffuser structure and a prismatic layer as described herein.

Description of the reference numerals

10. A substrate layer; 20. a first base layer; 201. diffusing the particles; 30. a prism layer; 301. a prism base layer; 302. a prism body;

40. an adhesive layer; 50. a second base layer; 60. a protective layer; 70. a haze layer.

Detailed Description

For the purposes of making the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail below with reference to the accompanying drawings.

It should be noted that unless otherwise defined, technical or scientific terms used in the embodiments of the present application should be given the ordinary meaning as understood by one of ordinary skill in the art to which the present application belongs. The terms "first," "second," and the like, as used in embodiments of the present application, do not denote any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that elements or items preceding the word are included in the element or item listed after the word and equivalents thereof, but does not exclude other elements or items. The terms "connected" or "connected," and the like, are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", etc. are used merely to indicate relative positional relationships, which may also be changed when the absolute position of the object to be described is changed.

Since the actual size of the diffusion particles 201 in the layer such as the light diffusion particles 201 according to the embodiment of the present invention is very small, the dimensions of each structure in the drawings of the embodiment of the present invention are exaggerated for clarity and do not represent the actual size and proportion.

In the design of LED backlight, the LED backlight is divided into an edge light type light source and a direct type light source according to the distribution positions of the light sources, and along with the continuous trend of the LCD module towards brighter, lighter and thinner, the edge light type backlight becomes the main development flow in the design structure of the backlight.

Along with the development of the side-in type backlight products of the display to narrow frames and even no frames at present, the distance from the light emitting surface of the LED to the effective light emitting area (denoted by A) in the backlight is smaller and smaller, meanwhile, in order to pursue low power consumption and low cost, the design is directed to hope that the distance value between the LEDs (denoted by P) is large, the number of the whole LED particles is reduced in structure, the design can lead to insufficient light mixing distance of the backlight, and the undesirable risk of uneven brightness (namely Hotspot phenomenon) of the display area corresponding to the light emitting side of the LED is higher and higher.

The diffusion sheet structure is one of the important constituent structures of the LED backlight module, and has the main function of providing a uniform surface light source for the display, as shown in fig. 1, the current diffusion sheet structure (a) generally comprises a haze layer 70, a base material and a protective layer 60, the base material and the haze layer 70 are sequentially arranged outwards along the light emitting direction, as the product is upgraded and updated, the brightness requirement and the low power consumption requirement of the module are more and more intense, the technology development is relatively mature for the side-entry backlight, the lifting space of most of the materials is quite limited, so that a new diffusion sheet structure (B) is provided by various manufacturers in recent two years, as shown in fig. 2, a prism layer 30 is added, only the use mode is completely opposite to that of a prism, the light emitted from the light guide plate needs to be concentrated into a smaller view angle, more light energy is utilized by the prism, and thus the brightness of the module is greatly improved, and the brightness gain can reach 13-20% compared with the conventional diffusion.

However, in the project using and testing process, it is found that, in the above-mentioned diffuser structure, since the prism layer 30 has higher directivity to the light beam, the Hotspot defect of the module is more likely to be aggravated, which requires that a larger a/P value ratio is required to be designed in the backlight design to improve the Hotspot defect of the module, but the large a/P value ratio severely limits the application scenario of the diffuser structure with the prism layer 30, which is not beneficial to the wide popularization of the diffuser structure.

Based on the above prior art, a diffusion sheet structure is provided in one or more embodiments of the present application, and embodiments of the present application are described in detail below with reference to the accompanying drawings.

As shown in fig. 3 to 6, the diffusion sheet structure described in the present application includes a substrate layer 10, a first base layer 20 disposed on one side of the substrate layer 10, and a prism layer 30, wherein a plurality of diffusion particles 201 with irregular particle sizes are distributed on the first base layer 20, and the prism layer 30 is adhered to the substrate layer 10 through an adhesive layer 40; or, the prism layer 30 is adhered to the side of the first base layer 20 remote from the substrate layer 10 by an adhesive layer 40; wherein the prism layer 30 has a prism peak disposed toward the substrate layer 10, and the first base layer 20 is configured to receive light and then project the light to the prism layer 30.

As can be seen from the above description, the diffusion sheet structure of the present application, based on the related art structure, uses the adhesive layer 40 to adhere the prism layer 30, and uses the refraction effect of the prism layer 30 to collect the outgoing light beam, thereby improving the light utilization rate and brightness gain; meanwhile, the first base layer 20 is bonded to form a multi-layer film composite structure, the problem of uneven brightness caused by the prism layer 30 can be improved by using the diffusion particles 201 distributed on the first base layer 20, the large A/P value scene limit is eliminated, and the diffusion sheet structure is beneficial to being suitable for wider application scenes.

Here, it should be noted that, since the diffuser structure has the prism layer 30, the prism layer 30 tends to collect light and maintain the forward output of light, and thus the diffuser structure described herein is suitable for use in a side-entry backlight structure.

In addition, the azimuth words such as "upper", "lower" in this application are all for explaining with reference to the light-emitting direction, along the light-emitting direction of emergent light beam, have arranged reflector plate, light guide plate, lower diffusion piece structure, prism rete and last diffusion piece structure in proper order from bottom to top in the display module assembly, and here, the diffusion piece structure in this application be applicable to lower diffusion piece. Of course, the composition structure is different corresponding to different display modules, and this is only illustrated in the present embodiment.

As shown in fig. 4, in some embodiments, the diffusion sheet structure further includes a second base layer 50 disposed on a side of the prism layer 30 away from the adhesive layer 40, and a plurality of diffusion particles 201 having irregular particle sizes are distributed on the second base layer 50.

In the above embodiment, the first base layer 20 and the second base layer 50 may be made of the same material, and the first base layer 20 and the second base layer 50 are light homogenizing layers with a preset haze, and the first base layer 20 and the second base layer 50 are used for uniformly diffusing and emitting the light emitted by the light guide plate. Here, the first base layer 20 and the second base layer 50 may be made of the following materials: resins, polymethyl methacrylate (polymethyl methacrylate, abbreviated as PMMA) and Polycarbonate (PC).

In addition, based on the first base layer 20 and the second base layer 50 having a certain haze, that is, the diffusion sheet structure as a whole has a certain haze, in the case where only the first base layer 20 is provided in the diffusion sheet structure, the haze of the first base layer 20, that is, the haze of the diffusion sheet structure as a whole; in the case where the first base layer 20 and the second base layer 50 are provided in the diffusion sheet structure, the sum of the overall haze of the first base layer 20 and the second base layer 50 is the haze of the diffusion sheet structure as a whole. The integral shielding effect of the film material can be greatly improved by utilizing the newly added second base layer 50, meanwhile, the newly added second base layer 50 can not reduce the brightness of the module due to the structure of the prism layer 30, and the uneven brightness phenomenon is improved on the premise of ensuring that the brightness is unchanged.

Because the first base layer 20 in the embodiment of the application is located below the prism layer 30, the incident light is firstly homogenized by the first base layer 20 and then collected by the prism layer 30 to form emergent light, compared with the diffusion sheet structure (a) in the related art, the haze layer 70 is arranged above the prism layer 30, and larger haze parameters can be set, so that the light uniformity effect and brightness gain can be guaranteed, and the problem that the display brightness is influenced due to overlarge haze of the haze layer 70 in the related art can be avoided.

In some embodiments, the diffusion particles 201 in the first base layer 20 and the second base layer 50 refer to geometric bodies having specific shapes within a size range, when light is incident on the first base layer 20 or the second base layer 50, that is, the light is incident in the diffusion particles 201, the light is reflected or refracted multiple times under the action of the diffusion particles 201, and the traveling direction of the light is changed, so that a diffusion effect of the light is generated, and the light not incident on the plurality of particles travels along the original traveling direction, so that a uniform light effect of the first base layer 20 and the second base layer 50 is realized.

In the above embodiments, the size range is typically between millimeters and nanometers, and the size range of the diffusion particles 201 is illustratively 1-20 μm. The diffusion particles 201 are not limited to spherical geometries, for example, the diffusion particles 201 include at least one of spherical, columnar, or pyramidal shapes, and further, some embodiments of the present disclosure do not limit the materials from which the diffusion particles 201 are made. Illustratively, the diffusion particles 201 include at least one of silica particles, polystyrene resin particles, polymethyl methacrylate particles, or polycarbonate particles, that is, the plurality of diffusion particles 201 are formed of at least one material of silicon monoxide, polystyrene resin, polymethyl methacrylate, or polycarbonate.

As shown in fig. 4, in some embodiments, the prism layer 30 is adhered to the side of the first base layer 20 away from the substrate layer 10 by an adhesive layer 40, and the side of the substrate layer 10 away from the first base layer 20 is further provided with a protective layer 60. Here, the adhesive layer 40 may be made of transparent optical adhesive material such as OC adhesive or UV adhesive, one side of the adhesive layer 40 is adhered to the first base layer 20, and the other opposite side is adhered to the peak surface of the prism layer 30, so that when the first base layer 20 receives the light of the light guide plate, the light is uniformly emitted to the prism layer 30, and the light is emitted out of the diffusion sheet structure by using the refraction characteristic of the prism layer 30.

In the above embodiment, the protective layer 60 may be formed by at least one transparent material selected from TriacetylCellulose (TAC for short), polymethyl methacrylate (Polymethyl Methacrylate, PMMA for short) (may be referred to as acryl), cyclic olefin polymer (Cyclo Olefin Polymer, COP for short) or polyethylene terephthalate (PET for short Polyethylene terephthalate), and the diffusion particles 201 having a smaller size and being uniformly arranged may be distributed in the protective layer 60 so as to prevent the protective layer 60 from being adsorbed to the light guide plate to affect normal propagation of light. Here, the protective layer 60 is provided to improve the overall mechanical performance of the diffuser structure, protect the prism layer 30 and the first base layer 20, and prevent the first base layer 20 from shrinkage deformation or cracking, and meanwhile, prevent the diffuser structure from scratching the light guide plate under the premise of ensuring good light transmittance.

In some embodiments, as shown in fig. 5, the prism layer 30 is bonded to the substrate layer 10 by an adhesive layer 40, and the first base layer 20 is positioned on a side of the substrate layer 10 facing away from the prism layer 30. Here, the adhesive layer 40 may be disposed with reference to the aforementioned adhesive layer 40, and when the first base layer 20 receives the light of the light guide plate, the light is uniformly emitted to the substrate layer 10 and the prism layer 30, and the light is emitted out of the diffusion sheet structure by using the refractive characteristics of the prism layer 30.

As shown in fig. 3, in some embodiments, the prism layer 30 includes a prism base layer 301 and a plurality of prism bodies 302 disposed on the prism base layer 301, and the prism peaks of the plurality of prism bodies 302 are disposed toward the adhesive layer 40. After receiving the incident light of the light guide plate, the prism body 302 with the downward prism peak refracts the light with an inclined angle and then emits the light out of the diffusion sheet structure, so that the light with a large viewing angle is more converged to form the light range with a small viewing angle, the light receiving viewing angle of the prism is more met, and the light utilization rate and brightness are improved.

The cross section of the prism body 302 may be triangular as shown in fig. 3, or may be other shapes, such as trapezoid or tip wedge, for example, a plurality of prism bodies 302 with triangular cross sections are uniformly distributed on the prism base layer 301, or the prism bodies 302 with triangular or trapezoid cross sections are alternately arranged on the prism base layer 301.

On this basis, optionally, the sections of the plurality of prism bodies 302 may be different shapes of non-isosceles trapezoids (or non-isosceles triangles), so that the emergent angles of the light rays converged by the plurality of prism bodies 302 are different, and the diffuser structure can generate a certain haze, so as to mask the design flaws on the light guide plate. In this case, the backlight module having the diffusion sheet can emit uniform light while improving brightness.

In some embodiments, in order to maintain the thickness uniformity of the film structure in the embodiments of the present application, the distance between the most distal point of each prism body 302 away from the prism base layer 301 and the prism base layer 301 is the same, and at the same time, when the prism bodies 302 are bonded to the adhesive layer 40, the regular prism bodies 302 can form a stable connection effect.

Here, the prism base layer 301 serves as a carrier substrate for the prism body 302, and the prism base layer 301 and the base layer 10 may be made of the same material, for example, a PET material with high transparency. Since the multi-layer composite forms a film structure in which the prism layer 30 itself includes the prism base layer 301, the thickness of the base layer 10 can be suitably reduced from 50 μm or more to 20 μm-30 μm in the related art, and the thickness of the prism base layer 301 is used to compensate and secure the overall supporting performance of the film structure, so that the thickness of the entire diffusion sheet structure is equivalent to that of the diffusion sheet structure in the related art. That is, the overall thickness of the prism base layer 301 and the base material layer 10 is taken as the total base material layer 10 thickness in the related art. Thus, the uneven brightness of the display module is improved and the brightness gain of the diffusion sheet structure (B) is also maintained on the premise that the thickness of the diffusion sheet structure is equivalent to that of the relevant diffusion sheet structure (A) or diffusion sheet structure (B).

In addition, in the above embodiment, the thickness of the substrate layer 10 is 20 μm-30 μm, which is only illustrative, and the thickness of the substrate layer 10 should be changed according to the actual application, and the core principle is as follows: after determining the thicknesses of the adhesive layer 40, the first base layer 20, the second base layer 50 and the protective layer 60, the total thickness of the diffusion sheet structure is determined by using the sum of the total thicknesses of the base material layer 10 and the prism base layer 301, and the greater the thickness of the base material layer 10, the smaller the thickness of the prism base layer 301, and conversely, the smaller the thickness of the base material layer 10, the greater the thickness of the prism base layer 301. The overall thickness of the determined diffusion sheet structure should be equal to or less than that of the diffusion sheet structure in the related art, thereby achieving both the effects of improving the luminance unevenness and increasing the luminance gain while maintaining the thickness equivalent to that in the related art.

Fig. 3 is an exemplary diffusion sheet structure, in fig. 3, a protective layer 60, a base material layer 10, a first base layer 20, an adhesive layer 40 and a prism layer 30 are sequentially disposed in an upward direction along a light emitting direction, wherein the haze of the first base layer 20 is greater than that of a haze layer 70 in the related art, and since the prism layer 30 is located above the first base layer 20, more light rays can be collected by the prism layer 30 and collected to emit the diffusion sheet structure in the light rays uniformly emitted through the first base layer 20, so that the phenomenon of uneven brightness can be improved on the premise of ensuring brightness gain.

Fig. 4 is another exemplary diffuser structure, unlike fig. 3, in which a second base layer 50 is disposed on the upper layer of the prism layer 30, and the second base layer 50 and the first base layer 20 have the same function, so that the haze superposition of the first base layer 20 and the second base layer 50 can further improve the shielding effect of the diffuser structure, and the haze of the first base layer 20 and the second base layer 50 may be the same or different, so long as the arrangement of the first base layer 20 and the second base layer 50 is ensured not to affect the original brightness of light.

In the above embodiment, the respective haze settings of the first base layer 20 and the second base layer 50 may be larger than the haze of the haze layer 70 in the related art, or may be smaller than the haze of the haze layer 70 in the related art, as long as the sum of the haze of the first base layer 20 and the second base layer 50 is larger than the haze of the haze layer 70 in the related art, the diffusion sheet structure of the large haze parameter can enhance the uniform effect of the light, thereby improving the uneven brightness phenomenon of the display module.

Fig. 5 is another exemplary diffusion sheet structure, in which the first base layer 20 is positioned at the lowermost layer of the diffusion sheet structure and the prism layer 30 is positioned at the uppermost layer of the diffusion sheet structure in fig. 5, in the diffusion sheet structure of the present embodiment, since the first base layer 20 directly contacts the light guide plate, the first base layer 20 may employ the surface microstructure haze layer 70 of the related art instead of the internally structured diffusion particles 201, that is, the rugged first base layer 20 film is formed by embossing with a steel wheel, thereby improving the structural strength of the first base layer 20.

Fig. 6 is another exemplary diffusion sheet structure, which is different from fig. 5 in that a second base layer 50 is provided on the upper layer of a prism layer 30, and the second base layer 50 and the first base layer 20 function identically, wherein the second base layer 50 and the first base layer 20 can be formed in the same manner, i.e., the rugged base layer is formed using a steel wheel stamp.

Here, the diffusion particles 201 may be disposed on the first base layer 20 or the second base layer 50 in such a manner that the spherical particles are uniformly distributed as described above, and as an alternative embodiment, the first base layer 20 is embossed with a steel wheel, and the surface thereof is formed with an uneven micro-surface structure, and the uneven micro-surface structure is used to play a role of uniform light. Compared with the mode of distributing spherical particles, the micro-surface structure can effectively enhance the integral deformation resistance of the first base layer 20, and ensure the stability and scratch resistance of the first base layer 20 when in contact with the light guide plate.

In some embodiments, three assembled luminances of the diffusion sheet structure (a), the diffusion sheet structure (B) and the diffusion sheet structure of the present application in the figures are measured, and other film layers and structural members not mentioned are kept consistent, and a diffusion sheet structure gain graph as shown in fig. 7 is obtained, and as can be seen in fig. 7, the diffusion sheet structure (B) improves the luminance gain by about 21% compared with the diffusion sheet structure (a), and the diffusion sheet structure of the present application improves the luminance gain by about 22% compared with the diffusion sheet structure (a), and the luminance gain of the diffusion sheet structure of the present application is equivalent to that of the diffusion sheet structure (B).

In some embodiments, fig. 8 is a light pattern diagram of light rays exiting from the light guide plate, in fig. 8, the scales on the left side 80 to 80 represent angles of viewing the LGP (light guide plate ) from a vertical direction, the scales on the periphery 0 to 360 of the light pattern diagram represent angles of viewing the LGP from a horizontal direction, and the scales on the right side corresponding to different color bars represent brightness of the LGP at this position; where 0 deg. in the horizontal direction corresponds to the DP side of the backlight (the side where the active driver is arranged is generally called DP side) and 180 deg. corresponds to the DPO side of the backlight (the side opposite to the DP side). As can be seen from fig. 8, the LGP directs most of the outgoing light from the backlight to a large viewing angle of 70 ° or more, so that the diffusion and prism effects are required to correct most of the light to within 10 °, so as to more conform to the habit of using the display by people.

In some embodiments, fig. 9 is a view of an exemplary prism layer 30, and the best view of the prism is tested according to the principle of reversibility of the optical path, and it can be seen from fig. 9 that the best view of the prism is between 40 ° and 80 °, that is, the prism can convert light between 40 ° and 80 ° into light with a positive viewing angle within 10 ° that can be utilized.

On this basis, when the prism is adopted, in some embodiments, fig. 10 is a matching diagram of the Light shape after diffusion and the prism Light receiving view angle when the diffusion sheet structure (a) is arranged on the Light guide plate, as can be seen from fig. 10, the Light with a large view angle exiting from the Light guide plate is mainly concentrated in the view angle range of 20 ° to 60 ° after being diffused by the diffusion sheet structure (a), so that a part of Light enters the Light receiving view angle of the prism, but as can also be seen from the diagram, the proportion of the Light entering the Light receiving view angle is lower, which limits the upper brightness limit of the backlight module (BLU).

When the prism is adopted, in some embodiments, fig. 11 is a matching diagram of the light shape after diffusion and the prism light receiving angle when the diffusion sheet structure (B) is arranged on the light guide plate, and as can be seen from fig. 11, the light with a large angle of view exiting from the light guide plate is divided into two light packets after being diffused by the diffusion sheet structure (B), the angle of view ranges of the two light packets are mainly concentrated between 40 ° and 80 ° and are highly matched with the light receiving angle of view of the prism, which means that more light can be utilized by the prism, thereby being beneficial to improving the brightness of the backlight module.

When the prism is adopted, in some embodiments, fig. 12 is a matching diagram of the light shape after diffusion and the prism light receiving angle when the diffusion sheet structure is arranged on the light guide plate, and as can be seen from fig. 12, the light shape in the diagram is basically consistent with the light shape of the diffusion sheet structure (B), so that it can be proved that the feasibility of the diffusion sheet structure is high, and the uneven brightness phenomenon can be improved on the premise of keeping the brightness of the backlight module.

Based on the same inventive concept, the application also provides a display module, including the diffusion sheet structure as described in any of the embodiments above.

In some embodiments, along the light emitting direction of the emergent beam, a reflecting sheet, a light guide plate, a lower diffusion sheet structure, a prism film layer and an upper diffusion sheet structure are sequentially arranged in the display module from bottom to top, a rubber frame, a back plate and a sheet metal part are arranged outside the display module, the rubber frame is arranged around the display module in a circle, and the back plate and the sheet metal part encapsulate the rubber frame and the liquid crystal display module into a whole. Here, the backplate mainly plays support and guard action, and the gluey frame is used for forming the display module assembly with backlight unit and liquid crystal together with fixed, backplate and sheet metal component will add frame and liquid crystal display module assembly encapsulation shaping.

In the above embodiment, the display module further includes a light bar, and the reflective sheet plays a role in reflecting light, so that light emitted by the LED lamp on the light bar is prevented from being absorbed by the back plate, and the light guide plate changes light emitted by the light bar from side light into backlight, so as to change the propagation direction of the light. In addition, in some embodiments, in order to avoid that the side brightness of the light guide plate far from one side of the light bar is too high, so that the local excessive brightness affects the overall light emitting effect, a light shielding strip is adhered on the other side of the light guide plate opposite to the light bar to absorb light. Here, the plastic frame, the back plate, the sheet metal part and the like of the display module set in the present application may be assembled and arranged with reference to the side-entry backlight module set structure in the related art, which is not described in the embodiments of the present application.

Based on the same inventive concept, the application also provides a display device, which comprises the display module of any one of the embodiments; the display device can be applied to the display module in any of the above embodiments, so that the display device has all the advantages and beneficial effects of the display module described in any of the above embodiments, which are not described in the embodiments of the present application.

The application is not particularly limited to the application of the display device, and may be any product or component with a display function, such as a television, a notebook computer, a tablet computer, a wearable display device, a mobile phone, a vehicle-mounted display, navigation, an electronic book, a digital photo frame, an advertisement lamp box, and the like, which is not described in the embodiment of the application.

It should be noted that some embodiments of the present application are described above. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims may be performed in a different order than in the embodiments described above and still achieve desirable results. In addition, the processes depicted in the accompanying figures do not necessarily require the particular order shown, or sequential order, to achieve desirable results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

In this application, each embodiment is described in a progressive manner, and each embodiment focuses on a difference from other embodiments, and the same or similar parts between the embodiments refer to each other.

The description of the present application has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the invention in the form disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art. The embodiments were chosen and described in order to best explain the principles of the application and the practical application, and to enable others of ordinary skill in the art to understand the application for various embodiments with various modifications as are suited to the particular use contemplated.

Those of ordinary skill in the art will appreciate that: the discussion of any of the embodiments above is merely exemplary and is not intended to suggest that the scope of the application (including the claims) is limited to these examples; the technical features of the above embodiments or in the different embodiments may also be combined within the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of brevity.

While the present application has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of those embodiments will be apparent to those skilled in the art in light of the foregoing description.

The present embodiments are intended to embrace all such alternatives, modifications and variances which fall within the broad scope of the appended claims. Accordingly, any omissions, modifications, equivalents, improvements and/or the like which are within the spirit and principles of the embodiments are intended to be included within the scope of the present application.

Claims (10)

1. A diffusion sheet structure comprising:

the substrate comprises a substrate layer and a first base layer arranged on one side of the substrate layer, wherein a plurality of diffusion particles with irregular particle sizes are distributed on the first base layer;

a prism layer bonded to the substrate layer by an adhesive layer; or, the prism layer is adhered to the side of the first base layer away from the substrate layer through an adhesive layer; the first base layer is configured to receive light and then project the light to the prism layer.

2. The diffusion sheet structure of claim 1, further comprising:

the second base layer is arranged on one side, far away from the bonding layer, of the prism layer, and a plurality of diffusion particles with irregular particle sizes are distributed on the second base layer.

3. A diffuser structure as set forth in claim 1 or 2 wherein said prismatic layer is bonded to a side of said first base layer remote from said substrate layer by an adhesive layer, said side of said substrate layer remote from said first base layer being further provided with a protective layer.

4. A diffuser structure as set forth in claim 1 or 2 wherein said prismatic layer is bonded to said base material layer by an adhesive layer, said first base layer being located on a side of said base material layer facing away from said prismatic layer.

5. The diffusion sheet structure according to claim 2, wherein the first base layer and/or the second base layer adopts one of the following materials: resins, polymethyl methacrylate and polycarbonates.

6. The diffuser structure as recited in claim 1, wherein said prismatic layer comprises a prismatic base layer and a plurality of prismatic bodies disposed on said prismatic base layer, wherein the peaks of said plurality of prismatic bodies are disposed toward said adhesive layer.

7. The diffuser structure as recited in claim 6, wherein said substrate layer and said prism-based layer are made of the same material.

8. The diffusion sheet structure according to claim 1, wherein the thickness of the substrate layer is 20 μm-30 μm.

9. A display module comprising a diffuser structure according to any one of claims 1 to 8.

10. A display device comprising the display module of claim 9.