Optical plate, light guide plate, backlight module and display panel

Abstract

The invention discloses an optical plate, a light guide plate and a backlight module, the optical plate comprises an optical plate body, the optical plate body comprises a first light-transmitting surface, a second light-transmitting surface opposite to the first light-transmitting surface, and a light incident side surface connected with the first light-transmitting surface and the second light-transmitting surface, a plurality of first strip-shaped structures are arranged on the first light transmitting surface, each first strip-shaped structure extends in the first direction, the first strip-shaped structures are arranged in the second direction, the first direction is perpendicular to the light incident side surface, and the second direction is perpendicular to the first direction; the first strip-shaped structure is in a cylinder-like shape, and the cylinder-like shape comprises a first plane, a convex arc surface and a second plane which are connected in sequence. The optical plate structure can be integrally formed in the plate extrusion process, light entering the corresponding light guide plate can be emitted in the horizontal direction at a narrow field angle, and meanwhile the center brightness of the light guide plate can be improved.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical plate, a light guide plate, a backlight module and a display panel. Background Art

[0002] At present, with the strategic requirements of energy conservation and emission reduction advocated by the country, for liquid crystal display LCD panels, the backlight module light source is required to have a higher central brightness under the same energy consumption.

[0003] In order to achieve a higher center brightness, in addition to improving the energy utilization of the light guide plate, the common practice is to compress the field angle of the light source emitted from the backlight module to improve the center brightness. The main implementation method at present is: the light guide plate adopts a specially designed asymmetric light guide microstructure, so that the light emitted from the light guide plate has a smaller field angle distribution. At the same time, the upper and lower brightness enhancement sheets and upper and lower diffusion sheets in the backlight module are used to adjust the field angle and peak angle of the light emitted from the light guide plate to achieve a narrower field angle and extremely high center brightness.

[0004] However, the above method has limited compression when compressing the field of view angle of the light guide plate in the horizontal direction. For example, the half-peak width of the full field of view angle is about 50°, and the improvement of the central brightness of the backlight source is also very limited, which is not conducive to achieving the goal of energy conservation and emission reduction in the LCD panel industry. Summary of the invention

[0005] In order to overcome the shortcomings and deficiencies in the prior art, the purpose of the present application is to provide an optical plate, and a corresponding light guide plate, a backlight module and a display panel, so that the light incident on the corresponding light guide plate can be emitted in a horizontal direction with a narrow field of view angle, and at the same time the central brightness of the light guide plate can be improved.

[0006] The objective of the present application is achieved through the following technical solutions: The present application provides an optical plate, the optical plate comprising: an optical plate body, the optical plate body comprising a first light-transmitting surface, a second light-transmitting surface arranged opposite to the first light-transmitting surface, and a light-entering side surface respectively connected to the first light-transmitting surface and the second light-transmitting surface, wherein: a plurality of first strip structures are arranged on the first light-transmitting surface, each of the first strip structures extends along a first direction, a plurality of the first strip structures are arranged along a second direction, the first direction is perpendicular to the light-entering side surface, and the second direction is perpendicular to the first direction; the first strip structure is in a cylindrical shape, the cylindrical shape comprising a first plane, a convex arc surface and a second plane connected in sequence.

[0007] Preferably, at least two of the first strip structures have unequal heights.

[0008] Preferably, the height difference between the two first strip structures of unequal heights is between 2 μm and 15 μm.

[0009] Preferably, the curvature radius of the cross section of the convex curved surface is between 5 μm and 120 μm.

[0010] Preferably, the first plane is connected to the second plane of the adjacent first strip structure.

[0011] Preferably, the angle between the first plane and the second plane of the adjacent first strip-shaped structure is between 50° and 150°.

[0012] Preferably, a plurality of second strip structures are disposed on the second light-transmitting surface, each of the second strip structures extends along the first direction, and a plurality of the second strip structures are arranged along the second direction.

[0013] Preferably, the heights of the plurality of second strip structures are equal.

[0014] The present application also provides a light guide plate, which includes any of the optical plates described above and also includes a plurality of light guide microstructures, wherein the plurality of light guide microstructures are arranged on the second light-transmitting surface.

[0015] The present application also provides a light guide plate, which includes any of the optical plates described above and also includes a plurality of light guide microstructures, wherein the plurality of light guide microstructures are arranged on the surface of the plurality of second strip structures and / or between the plurality of second strip structures.

[0016] The present application also provides a backlight module, comprising any of the above-mentioned light guide plates.

[0017] The present application also provides a display panel, comprising any of the above-mentioned backlight modules.

[0018] The optical plate provided in the present application can be used to prepare a light guide plate. By making the first strip structure arranged on the light-emitting surface (i.e., the first light-transmitting surface) present a cylindrical shape, on the one hand, the light guide plate manufacturing process is simplified and the manufacturing yield of the light guide plate is improved; on the other hand, the light guide plate and backlight module prepared based on the optical plate can make the light incident on the light guide plate emit in a narrow field of view angle in the horizontal direction, and at the same time can also improve the central brightness of the light guide plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic cross-sectional view of an optical plate according to the first embodiment of the present application.

[0020] Figure 2 This is a schematic diagram of a method for preparing an optical plate according to the first embodiment of the present application.

[0021] Figure 3 This is a schematic diagram of another method for preparing the optical plate according to the first embodiment of the present application.

[0022] Figure 4 It is a cross-sectional schematic diagram of an optical plate according to the second embodiment of the present application.

[0023] Figure 5 This is a schematic diagram of a method for preparing an optical plate according to the second embodiment of the present application.

[0024] Figure 6 This is a schematic diagram of another method for preparing an optical plate according to the second embodiment of the present application.

[0025] Figure 7 Schematic diagram of the horizontal viewing angle distribution of the light guide plate of the third embodiment of the present application and the conventional light guide plate.

[0026] Figure 8 This is a schematic diagram of the horizontal viewing angle distribution and central brightness distribution of the first backlight module and the second backlight module in the third embodiment of the present application.

[0027] Fig. 9 It is a structural schematic diagram of a light guide plate according to the fourth embodiment of the present application.

[0028] Fig.10 Schematic diagram of the structure of the light-guiding microstructure of the fourth embodiment of the present application.

[0029] Fig.11 It is a structural schematic diagram of a backlight module according to the fifth embodiment of the present application.

[0030] Fig.12 It is a schematic diagram of the horizontal viewing angle distribution and relative central luminance distribution of the first backlight module and the third backlight module of the fifth embodiment of the present application. DETAILED DESCRIPTION

[0031] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the display panel and the light guide plate proposed in the present application are described in detail below in combination with the accompanying drawings and preferred embodiments:

[0032] First embodiment

[0033] Please refer to Figure 1 The present application provides an optical plate 10, the optical plate 10 comprising: an optical plate body 105, the optical plate body 105 comprising a first light-transmitting surface 101, a second light-transmitting surface 102 arranged opposite to the first light-transmitting surface 101, and a light-incident side surface 103 connected to the first light-transmitting surface 101 and the second light-transmitting surface 102, respectively, wherein:

[0034] A plurality of first strip structures 104 are disposed on the first light-transmissive surface 101, each of the first strip structures 104 extends along a first direction, and the plurality of first strip structures 104 are arranged along a second direction, the first direction is perpendicular to the light-incident side surface 103, and the second direction is perpendicular to the first direction;

[0035] The first strip structure 104 is in a cylindrical shape, and the cylindrical shape includes a first plane 1041 , a convex arc surface 1042 , and a second plane 1043 connected in sequence.

[0036] Specifically, the optical plate body 105 is in the shape of a flat plate, the first light-transmitting surface 101 and the second light-transmitting surface 102 are two opposite surfaces of the optical plate body 105, and the light-entering side surface 103 is a side surface of the optical plate body. When the optical plate 10 is used to make a light guide plate, the light-entering side surface 103 can be used as the light-entering surface of the light guide plate.

[0037] In this embodiment, the first light-guiding microstructure 104 is in a cylindrical shape, and it can be understood that the first light-guiding microstructure 104 is in a strip shape. For ease of understanding, this embodiment takes one end point of the intersection line of the second light-transmitting surface 102 of the optical plate body 105 and the light-entering side surface 103 as the origin, and respectively takes the length, width, and height of the optical plate body 105 as the X-axis, Y-axis, and Z-axis to establish a coordinate system, then the first direction is the X-axis direction, and the second direction is the Y-axis direction. Accordingly, each first light-guiding microstructure 104 extends along the X-axis direction, and multiple first light-guiding microstructures 104 are arranged on the first light-transmitting surface 101 along the Y-axis direction, and the multiple first light-guiding microstructures 104 are parallel to each other.

[0038] In this embodiment, the material of the optical plate body 105 may be polymethyl methacrylate (PMMA), polycarbonate (PC) or methyl methacrylate-styrene (MS), and its thickness is between 0.2 mm and 2.5 mm. The material of the first strip structure 104 may be the same as or different from the material of the optical plate body 105. For example, when the optical plate body is PMMA, PC or MS, the first strip structure may be a UV glue having a refractive index that matches the material of the optical plate body. Specifically, when the optical plate body is PMMA, the first strip structure is a UV glue having a refractive index of 1.48.

[0039] In a specific embodiment, the first strip structure 104 is integrally formed with the optical plate body 105. For example, please refer to Figure 2 By using the extrusion molding technology, a structure roller 100 having a structure corresponding to the concave-convex structure formed by the plurality of first microstructures is used to directly form the optical plate body and the plurality of first microstructures formed on one surface thereof during the extrusion molding of the material; or, please refer to Figure 3By UV transfer or thermal transfer, the multiple first microstructures of the embossed film core 200 are molded on a surface of the optical plate body by UV glue. Of course, according to the needs of actual applications, other manufacturing methods can also be used to manufacture optical plates, and this application does not limit this.

[0040] In this embodiment, by making the first strip structure 104 cylindrical, the light guide plate manufacturing process can be simplified and the manufacturing yield of the light guide plate can be improved; at the same time, the light guide plate prepared based on the optical plate can make the light enter the light guide plate and then emit it with a narrow field angle in the horizontal direction, and at the same time can also improve the central brightness of the light guide plate.

[0041] In some embodiments, the first plane 1041 and the second plane 1043 are parallel to the first direction. The cross section of the convex arc surface 1042 is an arc with a circumferential angle less than 180°. Preferably, the circumferential angle of the cross section of the convex arc surface 1042 ranges from 60° to 120°.

[0042] In some embodiments, the heights of at least two of the first strip structures 104 are not equal, wherein the height of the first strip structure 104 is between 3 μm and 30 μm, and preferably, the height of the first strip structure 104 is between 5 μm and 15 μm. Here, the height of the first strip structure 104 is the maximum distance from a point on the first strip structure 104 to the first light-transmitting surface 101, including the sum of the height of the convex arc surface 1042 and the height from the first plane 1041 or the second plane 1042 to the first light-transmitting surface 101, wherein the height of the convex arc surface 1042 is the height of the cross section (i.e., arc) of the convex arc surface 1042, the height from the first plane 1041 to the first light-transmitting surface 101 is the maximum distance from a point on the first plane 1041 to the first light-transmitting surface 101, and the height from the second plane 1042 to the first light-transmitting surface 101 is the maximum distance from a point on the second plane 1042 to the first light-transmitting surface 101.

[0043] Specifically, in this embodiment, please continue to refer to Figure 1 , the multiple first strip structures 104 on the first light-transmitting surface 101 have at least two different heights, for example, a first height H1 and a second height H2, H1<H2, wherein H1=H3+H4, H2=H5+H6, H3 is the height from the first plane 1041 or the second plane 1042 of the first strip structure 104 with a height of H1 to the first light-transmitting surface 101, H5 is the height from the first plane 1041 or the second plane 1042 of the first strip structure 104 with a height of H2 to the first light-transmitting surface 101, and H4 and H6 are the heights of the convex arc surface of the first strip structure 104 with heights H1 and H2, respectively. It can be understood that, according to the needs of actual applications, the heights of the multiple first strip structures 104 on the first light-transmitting surface 101 can also be 3, 4 or even more, and the present application does not limit this.

[0044] In this embodiment, the height difference of the two first strip structures 104 with unequal heights is between 2 μm and 15 μm, and the contribution of the height difference of the two first strip structures 104 may come from the height difference from the first plane 1041 or the second plane 1042 of the two first strip structures 104 to the first light-transmitting surface 101, and / or the height difference of the convex arc surface 1042 of the two first strip structures 104. That is, the height from the first plane 1041 or the second plane 1042 of the two first strip structures 104 with unequal heights to the first light-transmitting surface 101 may be equal or unequal; the height of the convex arc surface 1042 of the two first strip structures 104 with unequal heights may be equal or unequal, and the present application does not impose any limitation on this.

[0045] Specifically, when at least two of the first strip structures 104 have unequal heights, the height difference between any two first strip structures 104 with unequal heights is between 2 μm and 15 μm, for example, the height difference may be specifically 3 μm, 5 μm, 8 μm, 10 μm, 12 μm, etc. Specifically, taking the heights of the two first strip structures 104 as the first height H1 and the second height H2 as an example, the difference between the first height H1 and the second height H2 is between 2 μm and 15 μm, for example, the difference ΔH is between 2 μm and 5 μm, and in a specific example, ΔH=H2-H1=H5-H3.

[0046] In a specific example, the first strip structures of unequal heights on the first light-transmitting surface 101 are arranged according to a preset rule to form an undulating shape. The multiple first strip structures 104 on the first light-transmitting surface 101 may have two different heights: a first height H1 and a second height H2, and H1<H2. The preset rule may be: at least one first strip structure of the first height is arranged between two first strip structures of the second height. Here, at least one may be 1 to 50, for example, at least one may be 2, 5, 8, 10, 15, 20, 30, 40, etc. Taking the arrangement of two first strip structures of the first height between two first strip structures of the second height as an example, the arrangement order of the heights of the multiple first strip structures on the first light-transmitting surface 101 is: ...H2 H1 H1 H2 H1 H1 H2 H1 H1 H2 H1 H1.......

[0047] Of course, the multiple first strip structures 104 on the first light-transmitting surface 101 may also have more than two different heights (such as H3, H4, H5, H6, H7, H8 arranged in order from high to low), and the preset rule may be: the first strip structures 104 are arranged in a sequence of multiple heights from high to low and then cycled, then the arrangement order of the heights of the multiple first strip structures on the first light-transmitting surface 101 is: ...H3H4H5H6H7H8H3H4H5H6H7H8......; or, the first strip structures 104 are arranged in a sequence of multiple heights from low to high and then cycled. It can be understood that, according to the needs of actual applications, the multiple first strip structures 104 may also be arranged according to other preset rules, and this application does not limit this.

[0048] In this embodiment, the heights of the multiple first strip structures of the optical plate are set to be unequal, and the first strip structures of different heights are reasonably arranged, so that an undulating shape is formed on the first light-transmitting surface of the optical plate. When used in conjunction with other film layers, it can prevent adsorption and whitening.

[0049] In some embodiments, the radius of curvature (R1, R2) of the cross section of the convex arc surface 1042 is between 5μm and 120μm. Preferably, the radius of curvature (R1, R2) of the cross section of the convex arc surface 1042 is between 5μm and 40μm. Moreover, the radii of curvature of the convex arc surface 1042 corresponding to the first strip structures 104 of different heights may be equal or unequal, and this application does not impose any restrictions. Here, the cross section of the convex arc surface 1042 is an arc, and the radius of curvature of the arc is between 5μm and 120μm. Specifically, the radius of curvature of the arc may be 10μm, 20μm, 50μm, 70μm, 90μm, etc.

[0050] In some embodiments, the first plane 1041 is connected to the second plane 1043 of the adjacent first strip structures 104. In this embodiment, the plurality of first strip structures 104 are arranged continuously, and there is no spacing between two adjacent first strip structures 104, and the two are directly connected.

[0051] In this embodiment, the connection between two adjacent first strip structures 104 is an arc-shaped surface, and the curvature radius of the cross-section of the connection between two adjacent first strip structures 104 is smaller than the curvature radius of the cross-section of the convex arc surface 1042. For example, the curvature radius of the cross-section of the connection between two adjacent first strip structures 104 is between 1 μm and 4 μm.

[0052] In this embodiment, the angle θ between the first plane 1041 and the second plane 1043 of the adjacent first strip structure 104 is between 50° and 150°. Specifically, the angle between the first plane 1041 and the second plane 1043 of the adjacent first strip structure 104 can be 60°, 80°, 90°, 100°, 120°, etc.

[0053] In some embodiments, the width P1 of the cross section of each of the first strip structures 104 is between 10 μm and 100 μm, where the width of the cross section of the first strip structure 104 is the projected length of the cross section of the first strip structure 104 on the first light-transmitting surface 101. Specifically, the width may be 15 μm, 20 μm, 40 μm, 50 μm, 60 μm, 80 μm, etc. It can be understood that when the first plane 1041 is connected to the second plane 1043 of the adjacent first strip structure 104, the arrangement period of the first strip structure 104 on the first light-transmitting surface 101 is the width of the cross section of the first strip structure 104.

[0054] Second embodiment

[0055] The optical plate of this embodiment is based on the structure of the optical plate provided in the first embodiment, and further has a plurality of second strip structures arranged on the second light-transmitting surface thereof.

[0056] In some embodiments, please refer to Figure 4 The optical plate 20 comprises: an optical plate body 205, a first light-transmitting surface 201, a second light-transmitting surface 202 arranged opposite to the first light-transmitting surface 201, and a light-incident side surface 203 connected to the first light-transmitting surface 201 and the second light-transmitting surface 202, wherein:

[0057] A plurality of first strip structures 204 are disposed on the first light-transmissive surface 201, each of the first strip structures 204 extends along a first direction, and the plurality of first strip structures 204 are arranged along a second direction, the first direction is perpendicular to the light-incident side surface 203, and the second direction is perpendicular to the first direction;

[0058] The first strip structure 204 is in a cylindrical shape, and the cylindrical shape includes a first plane 2041, a convex arc surface 2042, and a second plane 2043 connected in sequence;

[0059] Furthermore, a plurality of second strip structures 206 are disposed on the second light-transmissive surface 202 , each second strip structure 206 extends along the first direction, and the plurality of second strip structures 206 are arranged along the second direction.

[0060] In this embodiment, the second strip structure 206 is cylindrical, and it can be understood that the second strip structure 206 is strip-shaped. Continuing to refer to the coordinate system established above, each second strip structure 206 extends along the X-axis direction, and multiple second strip structures 206 are arranged on the second light-transmitting surface 202 along the Y-axis direction, and the multiple second strip structures 206 are parallel to each other.

[0061] Here, the material of the second strip structure 206 may be the same as or different from the material of the optical plate body 205. For example, when the optical plate body is PMMA, PC or MS, the second strip structure 206 may be UV glue having a refractive index matching that of the material of the optical plate body. Specifically, when the optical plate body is PMMA, the second light-guiding microstructure 205 is UV glue having a refractive index of 1.49.

[0062] In a specific embodiment, the second strip structure 206 is integrally formed with the optical plate body 205. For example, please refer to Figure 5 and Figure 6 Through the extrusion molding technology, the structure roller 100 having a structure corresponding to the concave-convex structure formed by the multiple first microstructures and the structure roller 300 having a structure corresponding to the concave-convex structure formed by the multiple second microstructures can be used simultaneously to directly form the optical plate body and the multiple first microstructures and multiple second microstructures formed on its two opposite surfaces during the material extrusion molding; or, through UV transfer or thermal transfer, the multiple first microstructures of the embossed film core 200 and the multiple second microstructures of the embossed film core 400 are respectively molded on the two opposite surfaces of the optical plate body through UV glue. Of course, according to the needs of actual applications, other manufacturing methods can also be used to manufacture optical plates, and this application does not limit this.

[0063] In this embodiment, by making the second strip structure 206 into a cylindrical shape, it is easier to demould or directly extrude the optical plate when manufacturing the optical plate, thereby improving the manufacturing yield of the optical plate.

[0064] In some embodiments, the cross section of the second strip structure 206 is an arc with a circumferential angle less than 180°. Preferably, the circumferential angle of the cross section of the second strip structure 206 ranges from 60° to 120°.

[0065] In this embodiment, the curvature radius R3 of the cross section of the second strip structure 206 is between 15 μm and 500 μm. For example, the curvature radius R3 of the cross section of the second strip structure 206 may be 20 μm, 50 μm, 80 μm, 100 μm, 200 μm, 300 μm, 400 μm, etc.

[0066] In some embodiments, the heights of the plurality of second strip structures 206 are equal. Here, the height of the second strip structure 206 is the maximum distance from a point on the second strip structure 206 to the second light-transmissive surface 202. Specifically, the height of the second strip structure 206 is between 3 μm and 25 μm, for example, the height of the second strip structure 206 can be 5 μm, 10 μm, 15 μm, 20 μm, etc.

[0067] In some embodiments, a plurality of second strip structures 206 are arranged continuously, and there is no spacing between two adjacent second strip structures 206 , and the two are directly connected.

[0068] In some embodiments, the width P2 of the cross section of each of the second strip structures 206 is between 30 μm and 300 μm, where the width of the cross section of the second strip structure 206 is the projected length of the cross section of the second strip structure 206 on the second light-transmitting surface 202. Specifically, the width may be 40 μm, 50 μm, 60 μm, 80 μm, 100 μm, 200 μm, etc. It can be understood that when there is no spacing between two adjacent second strip structures 206 and they are directly connected, the arrangement period of the second strip structures 206 on the second light-transmitting surface 202 is the width of the cross section of the second strip structure 206.

[0069] Third embodiment

[0070] The light guide plate provided in this embodiment is made based on any optical plate provided in the first embodiment. Further, the light guide plate also includes a plurality of light guide microstructures, and the plurality of light guide microstructures are arranged on the second light-transmitting surface of the optical plate.

[0071] Specifically, the optical plate of the first embodiment is used to make a light guide plate.

[0072] The optical plate body and the first strip structure of the optical plate are made of the same material, PMMA. The total thickness of the optical plate is 0.5 mm. A plurality of first strip structures are arranged on the first light-transmitting surface. The plurality of first strip structures have two different heights, H1=8μm and H2=11μm. The radius of curvature of the convex arc surface of the first strip structures of the two different heights is R1=R2=18μm. The arrangement period (i.e., P1) of the plurality of first strip structures is 30μm.

[0073] Furthermore, based on the structure of the optical plate, the light guide plate is also provided with a plurality of irregularly arranged light guide microstructures on the second light-transmitting surface of the optical plate, and finally, after the light is incident from the light-incident surface, it is reflected by the light guide microstructure and finally emitted from the first strip structure and the first light-transmitting surface. Among them, the light guide microstructure can be recessed into the optical plate on the second light-transmitting surface, or can be protruded from the optical plate on the second light-transmitting surface, and its structure can be one or more of a pyramid, a prism, a partial sphere, a partial cylinder, a hemisphere, a teardrop shape and a horseshoe shape, and this application is not limited by comparison.

[0074] The following is a comparison of the horizontal viewing angle distribution and relative central brightness of the light guide plate of the present embodiment and the conventional light guide plate (the difference from the present embodiment is that the first strip structure is not provided) and the light guide plate of the present embodiment and the conventional light guide plate assembled into the first backlight module and the second backlight module. Here, the first backlight module and the second backlight module respectively include an upper diffuser, a brightness enhancement sheet, a lower diffuser, a light guide plate and a reflective sheet which are stacked in sequence.

[0075] Please refer to Figure 7 , Figure 7 Schematic diagram of the horizontal viewing angle distribution of the light guide plate of this embodiment and the conventional light guide plate. It can be seen that, compared with the conventional light guide plate, the horizontal viewing angle of the light guide plate with the strip structure (first strip structure) of this embodiment is greatly compressed.

[0076] Please refer to Figure 8 , Figure 8 It is a schematic diagram of the horizontal viewing angle and central brightness distribution of the first backlight module and the second backlight module. It can be seen that compared with the second backlight module, the first backlight module using the light guide plate of this embodiment is more conducive to the concentration of light energy, and the central field brightness is increased by about 5%.

[0077] Furthermore, the light guide plate of this embodiment can effectively cover blemishes and reduce the visibility of the light guide microstructure, and at the same time, it also has a significant effect on solving the hotspot phenomenon of the light entrance.

[0078] Fourth embodiment

[0079] The light guide plate provided in this embodiment is made based on any optical plate provided in the second embodiment. Further, the light guide plate also includes a plurality of light guide microstructures, please refer to Fig. 9 The plurality of light-guiding microstructures are arranged on the surfaces of the plurality of second strip-shaped microstructures and / or between the plurality of second strip-shaped microstructures.

[0080] Specifically, the optical plate of the second embodiment is used to make a light guide plate.

[0081] The optical plate body, the first strip structure and the second strip structure of the optical plate are made of the same material, which is PMMA, and the total thickness of the optical plate is 0.5mm. Among them, a plurality of first strip structures are arranged on the first light-transmitting surface, and the plurality of first strip structures have two different heights, H1=8μm, H2=11μm, and the curvature radius of the convex arc surface of the first strip structures of two different heights is R1=R2=18μm; the arrangement period (i.e. P1) of the plurality of first strip structures is 30μm. A plurality of second strip structures are arranged on the second light-transmitting surface, and the heights of the plurality of second strip structures are the same, which are all 15μm; the cross-section of the second strip structure is an arc, and the curvature radius of the arc is 125μm, and the arrangement period (i.e. P2) of the plurality of second strip structures is 120μm.

[0082] For further information, please refer to Fig. 9 Based on the structure of the optical plate, the light guide plate is further provided with a plurality of irregularly arranged light guide microstructures 207 on the plurality of second strip-shaped microstructures of the optical plate. Finally, after the light is incident from the light incident surface, it is reflected by the light guide microstructure 207 and finally emitted from the first strip-shaped structure and the first light-transmitting surface.

[0083] Among them, multiple light-guiding microstructures 207 can be set inwardly in a concave manner on the surface of the second strip microstructure 206, or can be set outwardly in a convex manner on the surface of the second strip microstructure 206. Its structure can be one or more of a pyramid, a prism, a partial sphere, a partial cylinder, a hemisphere, a teardrop shape and a horseshoe shape, and this application does not limit it.

[0084] For a specific example, see Fig.10 The light-guiding microstructure 207 is a pyramid, and the light-guiding microstructure 207 is recessed inwardly on the surface of the second strip microstructure 206, wherein the plane BCEF of the light-guiding microstructure 207 is parallel to the second light-transmitting surface, the plane ABCD faces the light-incident side, and the angle between the plane ABCD and the plane BCEF is α, and α is between 0.5° and 25°, for example, α is 1°, 7.5° or 15°, etc.

[0085] Preferably, the light-guiding microstructure is recessed inwardly on the surface of the second strip-shaped microstructure, that is, the light-guiding microstructure is arranged inside the second strip-shaped microstructure, which can prevent the second strip-shaped microstructure from being scratched, thereby protecting the light-guiding microstructure. Furthermore, the second strip-shaped structure is arranged on the second light-transmissive surface of the optical plate, which can also prevent the adsorption effect between the light-guiding plate and other film layers.

[0086] Furthermore, the light guide plate of this embodiment can effectively cover blemishes and reduce the visibility of the light guide microstructure, and at the same time, it also has a significant effect on solving the hotspot phenomenon of the light entrance.

[0087] Fifth embodiment

[0088] Please refer to Fig.11 The present embodiment provides a backlight module, including a light source 30 (LED), a light guide plate, a reflective sheet 40 and an inverse prism 50, wherein the light guide plate is any one of the light guide plates described in the third embodiment or the fourth embodiment, and the light guide plate used in the present embodiment is a light guide plate 20 in the fourth embodiment, the light source 30 is arranged on the light incident side of the optical plate used to make the light guide plate, the reflective sheet 40 is arranged on the second light-transmitting side of the optical plate used to make the light guide plate, and the inverse prism 50 is arranged on the first light-transmitting side of the optical plate used to make the light guide plate.

[0089] In this embodiment, the vertex angle of the inverse prism is between 64° and 70°, so as to deflect the light emitted from the light guide plate with a larger light output angle (eg, about 70°) to the normal field of view (0°).

[0090] The following compares the horizontal viewing angle distribution and relative center brightness of the backlight module of this embodiment (referred to as the third backlight module) and the first backlight module of the third embodiment:

[0091] Please refer to Fig.12 , Fig.12 The figure is a schematic diagram of the horizontal viewing angle distribution and relative center brightness distribution of the third backlight module and the first backlight module. It can be seen that the full viewing angle half-peak width of the third backlight module in the horizontal direction is 40°, and the full viewing angle half-peak width of the first backlight module in the horizontal direction is 53°. Obviously, compared with the first backlight module, the center brightness of the third backlight module is increased by about 50%.

[0092] Sixth embodiment

[0093] This embodiment provides a display panel, and the display panel includes any one of the backlight modules described in the fifth embodiment.

[0094] It can be understood that, in the absence of conflict, the structures or structural features involved in the above embodiments can be arbitrarily superimposed.

[0095] In this document, unless otherwise specified or limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0096] In this document, the directions or positional relationships indicated by terms such as "up", "down", "front", "back", "left", "right", "top", "bottom", "inside", "outside", "vertical", and "horizontal" are based on the directions or positional relationships shown in the accompanying drawings and are only for the clarity of the technical solution and the convenience of description, and therefore should not be understood as limitations on this application.

[0097] In this document, the terms "comprises," "comprising," or any other variations thereof, are intended to cover a non-exclusive inclusion of elements other than those listed and may also include additional elements not expressly listed.

[0098] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. An optical plate, characterized in that: The optical plate comprises: an optical plate body, the optical plate body comprising a first light-transmitting surface, a second light-transmitting surface arranged opposite to the first light-transmitting surface, and a light-incident side surface respectively connected to the first light-transmitting surface and the second light-transmitting surface, wherein: A plurality of first strip structures are disposed on the first light-transmitting surface, each of the first strip structures extends along a first direction, and the plurality of first strip structures are arranged along a second direction, the first direction is perpendicular to the light-incident side surface, and the second direction is perpendicular to the first direction; The first strip structure is in a cylindrical shape, and the cylindrical shape includes a first plane, a convex arc surface and a second plane connected in sequence.

2. The optical plate according to claim 1, characterized in that: At least two of the first strip-shaped structures have different heights.

3. The optical plate according to claim 2, characterized in that: The height difference between the two first strip-shaped structures of unequal heights is between 2 μm and 15 μm.

4. The optical plate according to claim 1, characterized in that: The curvature radius of the cross section of the convex curved surface is between 5 μm and 120 μm.

5. The optical plate according to claim 1, characterized in that: The first plane is connected to the second plane of the adjacent first strip-shaped structures.

6. The optical plate according to claim 1, characterized in that: The included angle between the first plane and the second plane of the adjacent first strip-shaped structure is between 50° and 150°.

7. The optical plate according to any one of claims 1 to 6, characterized in that: A plurality of second strip structures are disposed on the second light-transmissive surface, each of the second strip structures extends along the first direction, and a plurality of the second strip structures are arranged along the second direction.

8. The optical plate according to claim 7, characterized in that: The heights of the plurality of second strip-shaped structures are equal.

9. A light guide plate, characterized in that: The light guide plate includes the optical plate described in any one of claims 1 to 6, and further includes a plurality of light guide microstructures, wherein the plurality of light guide microstructures are arranged on the second light-transmitting surface.

10. A light guide plate, characterized in that: The light guide plate includes the optical plate described in any one of claims 7-8, and also includes a plurality of light guide microstructures, wherein the plurality of light guide microstructures are arranged on the surface of the plurality of second strip structures and / or between the plurality of second strip structures.

11. A backlight module, characterized in that: The light guide plate comprises the light guide plate as claimed in claim 9 or 10.

12. A display panel, characterized in that: It comprises the backlight module as described in claim 11 above.

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