Optical module, manufacturing method thereof, backlight module and display device

Abstract

The invention provides an optical module and a manufacturing method thereof, a backlight module and a display device, and belongs to the technical field of display. The optical module comprises a light guide plate body and a supporting prism. The light guide plate body has a light-in surface, a light-out surface and a lattice point surface. The light-emitting surface is opposite to the lattice point surface. The light-in surface intersects with the light-out surface, and the light-in surface intersects with the lattice point surface. The lattice point surface is provided with lattice points, and the lattice points protrude towards the side away from the light-emitting surface. The supporting prism is located on the lattice point surface. The supporting prisms and the lattice points are distributed on the same layer. The supporting prism protrudes towards the side away from the light-emitting face, and the height of the supporting prism is larger than that of the lattice points. Wherein at least one supporting prism is arranged on the lattice point surface in a unit area. In the direction from the light incident face to the opposite face of the light incident face, the brightness adjusting capacity of the supporting prisms in the unit area is sequentially enhanced. The optical module can improve poor bright white points of the display device and is beneficial to guaranteeing the display effect of the display device.

Description

Technical Field

[0001] The present application relates to the field of display technology, and in particular to an optical module and a manufacturing method thereof, a backlight module and a display device. Background Art

[0002] The backlight module in the display device usually includes a light source, a light guide plate and a reflective sheet. The light source is located on the light incident side of the light guide plate, and the reflective sheet is located on the dot side of the light guide plate. The light guide plate is used to guide the light emitted by the light source so that the light is emitted from the light exiting side of the light guide plate.

[0003] During the assembly process of the backlight module, foreign objects such as light guide plate scraps and plastic frame scraps will inevitably remain in the gap between the light guide plate and the reflective sheet. These foreign objects are likely to damage the light guide plate, resulting in poor bright white point on the display device. Therefore, a solution is needed to improve the poor bright white point caused by light guide plate damage. Summary of the invention

[0004] The present application provides an optical module and a manufacturing method thereof, a backlight module and a display device, which can improve the poor white point of the display device and help ensure the display effect of the display device. The technical solution is as follows.

[0005] In a first aspect, an optical module is provided, the optical module comprising:

[0006] A light guide plate body, the light guide plate body having a light incident surface, a light emitting surface and a dot surface, the light emitting surface is opposite to the dot surface, the light incident surface intersects with the light emitting surface, and the light incident surface intersects with the dot surface, the dot surface has dots, and the dots protrude toward a side away from the light emitting surface;

[0007] A supporting prism is located on the mesh dot surface, the supporting prism is distributed in the same layer as the mesh dots, the supporting prism protrudes toward the side away from the light-emitting surface, the height of the supporting prism is greater than the height of the mesh dots, wherein on the mesh dot surface, there is at least one supporting prism per unit area, and along a first direction, the ability of the supporting prism per unit area to adjust the brightness of light increases successively, and the first direction is the direction from the light incident surface to the opposite surface of the light incident surface.

[0008] Optionally, the supporting prism comprises a first part, a second part and a third part which are sequentially connected and smoothly transitioned along the first direction, and the first part and the third part are symmetrical with respect to the second part;

[0009] A side of the first part away from the light emitting surface is a curved surface, and a side of the second part away from the light emitting surface is a semi-cylindrical surface;

[0010] The orthographic projection of a side of the first portion away from the light emitting surface on the plane where the light incident surface is located is arched, and along the first direction, the distance between the side of the first portion away from the light emitting surface and the light emitting surface increases successively.

[0011] Optionally, the radius of curvature R of the arch, the height H of the arch and the width D of the arch satisfy:

[0012] Optionally, the optical module includes a plurality of the supporting prisms, and along the first direction, the coverage of the mesh dot surface by the supporting prisms within a unit area increases sequentially.

[0013] Optionally, the widths of the plurality of supporting prisms distributed along the first direction increase sequentially, and the width of the supporting prism is the dimension of the supporting prism in a direction perpendicular to the first direction.

[0014] Optionally, the distribution density of the plurality of supporting prisms distributed along the first direction increases sequentially, and the distribution density of the supporting prisms is the number of the supporting prisms within the unit area.

[0015] Optionally, the optical module includes a plurality of supporting prism groups arranged along the first direction, each of the supporting prism groups includes a plurality of supporting prisms arranged along a second direction, and the second direction intersects with the first direction; the widths of the supporting prisms in the plurality of supporting prism groups increase sequentially.

[0016] Optionally, the multiple supporting prism groups are arranged at equal intervals; and the multiple supporting prisms in the same supporting prism group are arranged at equal intervals.

[0017] Optionally, the distance between any two adjacent supporting prism groups is in the range of 5 mm to 10 mm; and the distance between any two adjacent supporting prisms in the same supporting prism group is greater than or equal to 5 mm.

[0018] Optionally, the light emitting surface has an effective light emitting area, and the effective light emitting area has a first edge close to the light incident surface and a second edge close to an opposite surface of the light incident surface;

[0019] The distance between a first supporting prism group among the plurality of supporting prism groups and the light incident surface is greater than the distance between the first edge and the light incident surface;

[0020] A distance between a second supporting prism group among the plurality of supporting prism groups and a surface opposite to the light incident surface is greater than a distance between the second edge and a surface opposite to the light incident surface;

[0021] The first supporting prism group is a supporting prism group closest to the light incident surface among the plurality of supporting prism groups, and the second supporting prism group is a supporting prism group closest to the opposite surface among the plurality of supporting prism groups.

[0022] Optionally, the light guide plate body also has a first side surface and a second side surface, the first side surface is opposite to the second side surface, the first side surface intersects with the light incident surface, the light exit surface, the grid dot surface and the opposite surface of the light incident surface respectively, and the second side surface intersects with the light incident surface, the light exit surface, the grid dot surface and the opposite surface of the light incident surface respectively; in each of the supporting prism groups: the distance between the supporting prism closest to the first side surface and the first side surface ranges from 0 mm to 5 mm, and the distance between the supporting prism closest to the second side surface and the second side surface ranges from 0 mm to 5 mm.

[0023] Optionally, the height of the supporting prism is 4% to 8% of the thickness of the optical module; and the width of the supporting prism is in the range of 50 micrometers to 200 micrometers.

[0024] In a second aspect, a method for manufacturing a light guide plate is provided, comprising:

[0025] A light guide plate body is formed, wherein the light guide plate body has a light incident surface, a light emitting surface and a dot surface, wherein the light emitting surface is opposite to the dot surface, the light incident surface intersects with the light emitting surface, and the light incident surface intersects with the dot surface, and the dot surface has dots, and the dots protrude toward a side away from the light emitting surface;

[0026] A supporting prism is formed on the grid dot surface, wherein the supporting prism is distributed in the same layer as the grid dots, and the supporting prism protrudes toward a side away from the light emitting surface, and the height of the supporting prism is greater than the height of the grid dots, wherein on the grid dot surface, there is at least one supporting prism per unit area, and along a first direction, the ability of the supporting prism per unit area to adjust light brightness increases successively, and the first direction is the direction from the light incident surface to the opposite surface of the light incident surface.

[0027] Optionally, the light guide plate body and the supporting prisms are formed by the same injection molding step.

[0028] In a third aspect, a backlight module is provided, comprising: a reflective sheet, and an optical module provided in the first aspect or any optional implementation of the first aspect; the reflective sheet is located on the side of the grid surface of the light guide plate body, and the reflective sheet is in contact with the supporting prism.

[0029] In a fourth aspect, a display device is provided, comprising: a display panel, and a backlight module as provided in the third aspect.

[0030] The beneficial effects of the technical solution provided by this application include at least:

[0031] In the present application, the optical module includes a light guide plate body and a supporting prism. The light guide plate body has dots on its dot surface. The supporting prism is located on the dot surface of the light guide plate body. The supporting prism and the dots are distributed on the same layer. Both the dots and the supporting prism protrude toward the side away from the light emitting surface of the light guide plate, and the height of the supporting prism is greater than the height of the dots. Therefore, in a backlight module including the optical module, under the action of the supporting prism, the gap between the light guide plate body and the reflective sheet is larger, which helps to reduce the probability of foreign matter remaining in the gap between the light guide plate body and the reflective sheet damaging the light guide plate body, thereby improving the poor bright white point caused by damage to the light guide plate body.

[0032] Furthermore, in the present application, there is at least one supporting prism per unit area on the grid surface of the light guide plate body, and the ability of the supporting prism per unit area to adjust the light brightness is successively enhanced in the direction from the light incident surface of the light guide plate body to the opposite surface of the light incident surface, which helps to ensure the uniformity of the light output brightness of each area on the light output surface of the light guide plate body, and further helps to ensure the overall display effect of the display device having the optical module. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 It is a three-dimensional schematic diagram of a light guide plate provided by the related technology;

[0035] Figure 2 It is a three-dimensional schematic diagram of another light guide plate provided by the related technology;

[0036] Figure 3 is a three-dimensional schematic diagram of an optical module provided in an embodiment of the present application;

[0037] Figure 4 yes Figure 3 A schematic side view of the optical module shown;

[0038] Figure 5 It is an arrangement diagram of a supporting prism on a grid point surface of a light guide plate body provided in an embodiment of the present application;

[0039] Figure 6 This embodiment of the present application provides a light beam in Figure 5Schematic diagram of propagation in the optical module shown;

[0040] Figure 7 It is another arrangement diagram of supporting prisms on the grid point surface of the light guide plate body provided in an embodiment of the present application;

[0041] Figure 8 This embodiment of the present application provides a light beam in Figure 7 Schematic diagram of propagation in the optical module shown;

[0042] Fig. 9 is a three-dimensional schematic diagram of a supporting prism provided in an embodiment of the present application;

[0043] Fig.10 yes Figure 7 A projection diagram of the structure in the area A on the plane where the first side surface of the light guide plate body is located;

[0044] Fig.11 yes Figure 7 A projection diagram of the structure in area A on the plane where the light incident surface of the light guide plate body is located;

[0045] Fig.12 is a flow chart of a method for manufacturing an optical module provided in an embodiment of the present application;

[0046] Fig.13 is a schematic diagram of a backlight module provided in an embodiment of the present application;

[0047] Fig.14 It is a schematic diagram of a display device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the present application clearer, the implementation mode of the present application will be described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0049] The terms used in the implementation mode of the present application are only used to explain the embodiments of the present application, rather than to limit the present application. Unless otherwise defined, the technical terms or scientific terms used in the implementation mode of the present application should be the usual meanings understood by people with ordinary skills in the field to which the present application belongs. The "first", "second", "third" and similar words used in the present application do not represent any order, quantity or importance, but are only used to distinguish different components. Similarly, similar words such as "one" or "one" do not represent quantitative restrictions, but represent the presence of at least one. Similar words such as "include" or "comprise" mean that the elements or objects appearing in front of "include" or "comprise" cover the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects.

[0050] The backlight module in the display device usually includes a light source, a light guide plate and a reflective sheet. The light guide plate has a grid point surface, a light emitting surface and a light incident surface connected between the grid point surface and the light emitting surface. The light source is located on the side of the light incident surface of the light guide plate. The reflective sheet is located on the side of the grid point surface of the light guide plate. The light guide plate is used to guide the light emitted by the light source so that the light is emitted from the light emitting surface of the light guide plate. Among them, the grid point surface of the light guide plate includes a plurality of grid points, and the grid points are used to reflect and scatter the light entering the light guide plate to adjust the propagation path of the light. In addition, along the direction from the light incident surface of the light guide plate to the opposite surface of the light incident surface, the distribution density of the grid points increases successively to ensure the uniformity of the brightness of the light output of the light guide plate.

[0051] Specifically, after the light emitted by the light source enters the light guide plate from the light incident surface of the light guide plate, it propagates in the direction from the light incident surface to the opposite surface of the light incident surface. In the process of light propagating in the light guide plate, the dots on the dot surface can change the propagation direction of the light through reflection and scattering, thereby adjusting the propagation path of the light inside the light guide plate. In addition, in the process of light propagating in the light guide plate, it will gradually be emitted from the light exiting surface of the light guide plate, causing the intensity of the light propagating in the light guide plate to gradually decrease. If the dots on the dot surface are evenly distributed, the dots in different areas have similar regulating effects on the light, and there are differences in the intensity of the light emitted from different areas of the light exiting surface, showing that in the direction from the light incident surface to the opposite surface of the light incident surface, the brightness of the light emitted from the light exiting surface decreases successively, and the light guide plate exhibits the problem of uneven light brightness. If the distribution density of the dots increases successively along the direction from the light incident surface of the light guide plate to the surface opposite to the light incident surface, the regulating effect of the dots in the area along the direction from the light incident surface to the surface opposite to the light incident surface on the light will be strengthened successively, so that the intensity of the light emitted from different areas of the light exiting surface is more uniform, thereby achieving uniform brightness of the light emitted from each area on the light guide plate.

[0052] During the assembly process of the backlight module, foreign objects such as light guide plate scraps and plastic frame scraps will inevitably remain in the gap between the light guide plate and the reflector. During the movement and transportation of the backlight module, foreign objects remaining in the gap between the light guide plate and the reflector will damage the light guide plate due to vibration, shaking, squeezing, etc., resulting in poor bright spots on the display device. Poor bright spots refer to abnormal bright spots that appear on the display device. These abnormal bright spots remain lit in any picture and do not change with changes in image content.

[0053] Currently, the following five solutions can be used to solve the problem of poor bright white points caused by damage to the light guide plate.

[0054] Solution 1: Increase the gap between the light guide plate and the reflective sheet by increasing the height of all the dots on the light guide plate, thereby reducing the probability of foreign matter remaining in the gap between the light guide plate and the reflective sheet damaging the light guide plate. However, due to process limitations, this solution is difficult to implement. In addition, the degree of increase in the height of the dots is limited (the height of the dots ranges from 8 microns to 10 microns). Increasing the height of the dots does not effectively reduce the probability of foreign matter damaging the light guide plate, and thus cannot effectively improve the poor bright white point caused by damage to the light guide plate. This solution applied to thin display devices will also lead to visualization of the dots, affecting the display effect. Among them, dot visualization refers to the problem that the dots on the light guide plate become visible under certain conditions and affect the display screen.

[0055] Solution 2: Increase the height of some dots on the dot surface of the light guide plate to increase the gap between the light guide plate and the reflective sheet, and reduce the probability of foreign matter remaining in the gap between the light guide plate and the reflective sheet damaging the light guide plate. Among them, the part of the dots includes dots close to the light incident surface of the light guide plate. However, since the intensity of the light emitted from the light exiting surface of the light guide plate is relatively high, and the greater the height of the dots, the stronger the ability of the dots to adjust the light, therefore, increasing the height of the dots close to the light incident surface is likely to cause local bright spots in the area close to the light incident surface. In addition, the degree of increase in the height of the dots is limited (the height of the dots ranges from 8 microns to 10 microns), and increasing the height of the dots cannot effectively reduce the probability of foreign matter damaging the light guide plate, and thus cannot effectively improve the poor white point caused by damage to the light guide plate. This solution applied to thin display devices will also lead to visualization of dots, affecting the display effect.

[0056] Solution 3: Set a long strip of supporting prism on the dot surface of the light guide plate to increase the gap between the light guide plate and the reflective sheet through the supporting prism, and reduce the probability of foreign matter remaining in the gap between the light guide plate and the reflective sheet damaging the light guide plate. For details, please refer to Figure 1, which shows a three-dimensional schematic diagram of a light guide plate 10A provided by the related art. The light guide plate 10A has a light emitting surface and a dot surface, and the dot surface has dots ( Figure 1 The light guide plate 10A is provided with a plurality of supporting prisms 101A (not shown in the figure), and the plurality of supporting prisms 101A are arranged in sequence along the same direction, and the supporting prisms 101A protrude toward the side away from the grid point surface and are in the shape of an elongated strip. Moreover, the supporting prism 101A extends from the side close to the light incident surface of the light guide plate 10A to the side away from the light incident surface. The supporting prism 101A is used to increase the gap between the light guide plate 10A and the reflective sheet. However, the reflection path of the light in the extension direction of the elongated supporting prism 101A is longer and the reflection efficiency is higher. As the light intensity is higher on the side close to the light incident surface, the light reflected by the supporting prism 101A is prone to form a bright line in the area where the light exit surface is close to the light incident surface during the propagation process in the light guide plate 10A.

[0057] Solution 4: Set a conical support prism on the mesh surface of the light guide plate to increase the gap between the light guide plate and the reflector through the support prism, and reduce the probability of foreign matter remaining in the gap between the light guide plate and the reflector damaging the light guide plate. For details, please refer to Figure 2 , which shows a three-dimensional schematic diagram of another light guide plate 10B in the related art. The light guide plate 10B has a light emitting surface and a dot surface, and the dot surface has dots ( Figure 2 The plurality of supporting prisms 101B are arranged in sequence along the same direction, and the supporting prisms 101B are convex and conical toward the side away from the grid point surface. Furthermore, the supporting prisms 101B extend from the side close to the light incident surface of the light guide plate 10B to the side away from the light incident surface. In the extending direction of the supporting prisms 101B, the width of the supporting prisms 101B gradually increases, and the distance between the side of the supporting prisms 101B away from the light exiting surface and the light exiting surface also gradually increases, that is, the side of the supporting prisms 101B away from the light exiting surface is a semi-conical surface. The supporting prisms 101B are used to increase the gap between the light guide plate 10B and the reflective sheet. Since the distance between the side of the supporting prism 101B away from the light-emitting surface and the light-emitting surface gradually increases in the extension direction of the supporting prism 101B, and the intensity of the light gradually decreases during the propagation from the light-entering surface of the light guide plate 10B to the opposite side of the light-entering surface, the portion of the supporting prism 101B corresponding to the light with higher intensity has limited reflection effect on the light, which can avoid the bright line problem described in Solution 3. However, the supporting effect of the conical supporting prism 101B on the side of the light guide plate 10B close to the light-entering surface is insufficient, and the dots close to the light-entering surface are relatively sparse compared to the dots far from the light-entering surface, so the probability of producing bright white point defects is relatively high, resulting in limited improvement of the supporting prism 101B on the bright white point defects, and the overall display effect of the display device cannot be guaranteed.

[0058] Solution 5: Replace the light guide plate. This solution will increase the cost, and the replaced light guide plate may be damaged by foreign matter remaining in the gap between the light guide plate and the reflective sheet during use, resulting in poor bright white spots.

[0059] In summary, the above-mentioned technical solutions either have limited effect on improving the bright white point defect, or although they can improve the bright white point defect to a certain extent, they will introduce other defects (for example, bright lines, dot visualization and local bright spots, etc.), which makes it difficult to guarantee the display effect of the display device.

[0060] An embodiment of the optical module of the present application is introduced below. The optical module may be a light guide plate.

[0061] See also Figure 3 and Figure 4 , Figure 3 shows a three-dimensional schematic diagram of an optical module provided in an embodiment of the present application, Figure 4 Shows Figure 3 A side view schematic diagram of an optical module is shown. Figure 3 and Figure 4 As shown, the optical module includes a light guide plate body 10 and a supporting prism 31. The light guide plate body 10 has a light incident surface 11, a light emitting surface 12 and a dot surface 13. The light emitting surface 12 is opposite to the dot surface 13. The light incident surface 11 intersects with the light emitting surface 12, and the light incident surface 11 intersects with the dot surface 13. The dot surface 13 has dots 20 ( Figure 3 Not shown, see Figure 4 ), the grid point 20 protrudes to the side away from the light exiting surface 12. The supporting prism 31 is located on the grid point surface 13. The supporting prism 31 and the grid point 20 are distributed in the same layer. The supporting prism 31 protrudes to the side away from the light exiting surface 12, and the height of the supporting prism 31 is greater than the height of the grid point 20. Among them, there is at least one supporting prism 31 per unit area on the grid point surface 13. Along the first direction X, the ability of the supporting prism 31 per unit area to adjust the brightness of light increases successively, and the first direction X is the direction from the light incident surface 11 of the light guide plate body 10 to the opposite surface 14 of the light incident surface 11.

[0062] The unit area can be set according to actual conditions, for example, the unit area is 1 square centimeter, 1 square decimeter, etc. The height of the supporting prism 31 refers to the size of the supporting prism 31 in a direction perpendicular to the dot plane 13, and the height of the dot 20 refers to the size of the dot 20 in a direction perpendicular to the dot plane 13.

[0063] In the embodiment of the present application, the optical module includes a light guide plate body 10 and a supporting prism 31. The light guide plate body 10 has a light emitting surface 12 and a grid point surface 13, and the light emitting surface 12 is opposite to the grid point surface 13. The grid point surface 13 has grid points 20. The supporting prism 31 is located on the grid point surface 13, and the supporting prism 31 and the grid points 20 are distributed in the same layer. The grid points 20 and the supporting prism 31 both protrude to the side away from the light emitting surface 12, and the height of the supporting prism 31 is greater than the height of the grid points 20. Therefore, after the optical module is assembled in the backlight module, under the action of the supporting prism 31, the gap between the light guide plate body 10 and the reflective sheet is larger, which can reduce the probability of the light guide plate body 10 being scratched due to friction between foreign matter in the gap and the light guide plate body 10, thereby improving the poor bright white point caused by the scratching of the light guide plate body 10.

[0064] In the embodiment of the present application, the supporting prism 31 on the mesh surface 13 will also reflect and scatter the light entering the light guide plate body 10, and adjust the propagation path of the light. Therefore, by having at least one supporting prism 31 per unit area on the mesh surface 13, and the ability of the supporting prism 31 per unit area to adjust the brightness of light is gradually enhanced, so that as the distance between each area of ​​the light emitting surface 12 and the light incident surface 11 gradually increases, the ability of the supporting prism 31 per unit area to adjust the brightness of light is gradually enhanced, which can compensate for the loss of brightness of each area caused by the gradual decrease in the intensity of light, thereby ensuring the uniformity of the brightness of the light emitting surface 12, avoiding the occurrence of the aforementioned bright line and bright burst problems, and helping to ensure the display effect of the display device, which is suitable for practical applications. In a specific embodiment, the light guide plate body 10 and the supporting prism 31 are an integrated structure.

[0065] In an optional embodiment, the optical module includes a plurality of supporting prisms 31 distributed along a first direction X. Along the first direction X, the coverage rate of the supporting prisms 31 per unit area on the dot surface 13 increases successively, so that the probability that the light propagating along the first direction X is reflected by the supporting prisms 31 per unit area increases successively (i.e., the reflection effect increases successively), thereby realizing that the ability of the supporting prisms 31 per unit area to adjust the brightness of light in the first direction X increases successively. Among them, the coverage rate of the supporting prisms 31 per unit area on the dot surface 13 refers to the ratio of the area of ​​the positive projection of the supporting prisms 31 per unit area on the dot surface 13 to the unit area. Of course, in other embodiments, other aspects of the supporting prisms 31 may also be adjusted or designed to achieve a similar uniformity effect of the light output brightness.

[0066] In the embodiment of the present application, on the mesh dot plane 13 , the coverage of the mesh dot plane 13 by the supporting prisms 31 within a unit area along the first direction X increases successively, which may include at least one of the following two implementations.

[0067] A first implementation method: the distribution density of the supporting prisms 31 distributed along the first direction X increases successively, so that the coverage rate of the supporting prisms 31 on the grid surface 13 within a unit area along the first direction X increases successively. The distribution density of the supporting prisms 31 is the number of supporting prisms 31 within a unit area.

[0068] See also Figure 5 , which shows an arrangement diagram of a supporting prism 31 provided in an embodiment of the present application on the dot surface 13 of the light guide plate body 10. The distribution density of the multiple supporting prisms 31 distributed along the first direction X increases successively. In the embodiment of the present application, the distribution density of the multiple supporting prisms 31 distributed along the first direction X increases successively. When the sizes and structures of the multiple supporting prisms 31 are the same, the number of supporting prisms 31 per unit area increases successively, so that the coverage area of ​​the supporting prisms 31 per unit area on the dot surface 13 increases successively, and then the coverage rate of the supporting prisms 31 per unit area on the dot surface 13 increases successively.

[0069] See also Figure 6 , which shows a ray of light in Figure 5 As the distribution density of the plurality of supporting prisms 31 distributed along the first direction X increases successively, the probability of the light propagating along the first direction X being reflected by the supporting prisms 31 within a unit area increases successively, so that the ability of the supporting prisms 31 within a unit area along the first direction X to adjust the brightness of light increases successively.

[0070] In a possible implementation, the distribution density of the plurality of supporting prisms 31 distributed along the first direction X increases successively and the structure is the same, where "the structure is the same" means the same shape and the same dimensions (including length, width and height), so as to simplify the overall structure of the optical module. The width of the supporting prism 31 refers to the dimension of the supporting prism 31 in a direction perpendicular to the first direction X.

[0071] In another possible implementation, the distribution density of the plurality of supporting prisms 31 distributed along the first direction X increases successively but the structures are different. Here, "different structures" include different morphologies and / or different dimensions in at least one item. It should be noted that the different structures require that the coverage of the plurality of supporting prisms 31 on the mesh surface 13 per unit area increases successively.

[0072] The second implementation method: the widths of the multiple supporting prisms 31 distributed along the first direction X are increased successively, so that the coverage rate of the supporting prisms 31 on the grid surface 13 within a unit area along the first direction X is increased successively, and the width of the supporting prism 31 is the size of the supporting prism 31 in the direction perpendicular to the first direction X.

[0073] See also Figure 7, which shows another arrangement diagram of the supporting prisms 31 provided in the embodiment of the present application on the grid dot surface 13 of the light guide plate body 10, wherein the widths of the multiple supporting prisms 31 distributed along the first direction X are increased successively. In the embodiment of the present application, the widths of the multiple supporting prisms 31 distributed along the first direction X are increased successively, and when the lengths of the supporting prisms 31 are the same, the coverage areas of the grid dot surface 13 by the multiple supporting prisms 31 distributed in the first direction X are increased successively, so that the coverage rate of the supporting prisms 31 on the grid dot surface 13 within a unit area distributed in the first direction X is increased successively. Among them, the coverage area of ​​the supporting prisms 31 on the grid dot surface 13 refers to the area of ​​the orthographic projection of the supporting prisms 31 on the grid dot surface 13.

[0074] See also Figure 8 , which shows a light provided by an embodiment of the present application Figure 7 Schematic diagram of propagation in the optical module shown (propagation along II'). Since the widths of the plurality of supporting prisms 31 distributed along the first direction X are successively increased, the probability of light propagating along the first direction X being reflected by a single supporting prism 31 is successively increased, thereby achieving the ability of the supporting prism 31 per unit area to adjust the light intensity successively enhanced.

[0075] In a possible implementation manner, the plurality of supporting prisms 31 distributed along the first direction X have the same length and sequentially increase in width, and the length of the supporting prism 31 is the size of the supporting prism 31 in the first direction X.

[0076] In another possible implementation, the lengths and widths of the plurality of supporting prisms 31 distributed along the first direction X increase sequentially.

[0077] In an optional embodiment, if Figure 7 As shown, the optical module includes a plurality of supporting prism groups 30 arranged along a first direction X, and each supporting prism group 30 includes a plurality of supporting prisms 31 arranged along a second direction Y. The widths of the supporting prisms 31 in the plurality of supporting prism groups 30 increase sequentially. The second direction Y intersects the first direction X, for example, the second direction Y intersects the first direction X perpendicularly.

[0078] In an optional embodiment, the plurality of supporting prism groups 30 are arranged at equal intervals. The supporting prisms 31 in the same supporting prism group 30 are arranged at equal intervals. Exemplarily, among the plurality of supporting prism groups 30, the number of supporting prisms 31 in any two supporting prism groups 30 is the same, so that the plurality of supporting prisms 31 provide uniform support for the light guide plate body 10, avoiding the situation that the number of supporting prisms 31 in a local area is too small to affect the support effect.

[0079] In an optional embodiment, if Figure 7As shown, the distance between any two adjacent supporting prism groups 30 is a, and the distance between any two adjacent supporting prisms 31 in the same supporting prism group 30 is b. In the embodiment of the present application, a ranges from 5 mm to 10 mm, for example, 6 mm, 7.5 mm or 8 mm. b is greater than or equal to 5 mm, for example, 8 mm, 10 mm or 12 mm.

[0080] In the embodiment of the present application, the range of the distance a between any two adjacent supporting prism groups 30 and the range of the distance b between any two adjacent supporting prism groups 31 can provide a stable supporting effect for the light guide plate body 10, improve the poor bright white point, and avoid the adjacent supporting prisms 31 from interfering with and weakening the propagation path of the light, causing unnecessary light loss, and ensuring the light output efficiency of the optical module. Among them, the distance between any two adjacent supporting prism groups 30 is the distance between the centers of the supporting prisms 31 contained in each of the two supporting prism groups 30.

[0081] For an alternative embodiment, see Figure 7 The light emitting surface 12 has an effective light emitting area 121, and the effective light emitting area 121 has a first edge 121a close to the light incident surface 11 and a second edge 121b close to the surface 14 opposite to the light incident surface 11. The distance c between the first supporting prism group 30a in the above-mentioned multiple supporting prism groups 30 and the light incident surface 11 is greater than the distance d between the first edge 121a and the light incident surface 11. The distance e between the second supporting prism group 30b in the above-mentioned multiple supporting prism groups 30 and the surface 14 opposite to the light incident surface 11 is greater than the distance f between the second edge 121b and the surface 14 opposite to the light incident surface 11. Among them, the first supporting prism group 30a is the supporting prism group 30 closest to the light incident surface 11 among the multiple supporting prism groups 30, and the second supporting prism group 30b is the supporting prism group 30 closest to the surface 14 opposite to the light incident surface 11 among the multiple supporting prism groups 30. The effective light emitting area 121 of the light emitting surface 12 refers to an area on the light emitting surface 12 where the light emitting brightness is uniform and the brightness meets the application requirements.

[0082] In an optional embodiment, if Figure 3 and Figure 7As shown, the light guide plate body 10 also has a first side surface 15 and a second side surface 16. The first side surface 15 is opposite to the second side surface 16. The first side surface 15 intersects with the light incident surface 11, the light exit surface 12, the dot surface 13, and the opposite surface 14 of the light incident surface 11, respectively. The second side surface 16 intersects with the light incident surface 11, the light exit surface 12, the dot surface 13, and the opposite surface 14 of the light incident surface 11, respectively. In each supporting prism group 30: the distance g between the supporting prism 31 closest to the first side surface 15 and the first side surface 15 ranges from 0 mm to 5 mm, for example, 1 mm, 2.5 mm or 4 mm. The distance h between the supporting prism 31 closest to the second side surface 16 and the second side surface 16 ranges from 0 mm to 5 mm, for example, 2 mm, 3 mm and 5 mm. In one embodiment, the distance g between the supporting prism 31 closest to the first side surface 15 and the first side surface 15 is equal to the distance h between the supporting prism 31 closest to the second side surface 16 and the second side surface 16.

[0083] Since the function of the light guide plate body in the backlight module is to guide the light emitted by the light source so that the light is evenly distributed on the light incident side of the display panel, the brightness and uniformity of the displayed image are ensured. After the light enters the light guide plate body, it is reflected, scattered and refracted before being emitted through the light emitting surface of the light guide plate body. Even if the distribution and design of the dots can reduce the difference in light uniformity from the light incident surface to the opposite surface of the light incident surface, there will still be a certain difference in the light uniformity between the edge area of ​​the light incident surface and the central area of ​​the light incident surface. Therefore, the light emitting surface includes an effective light emitting area and an ineffective light emitting area. In the embodiment of the present application, although the supporting prism 31 has a certain dimming effect, the effective light emitting area 121 of the light guide plate body 10 still depends to a large extent on the distribution and design of the dots 20. Therefore, the distribution areas of the multiple supporting prisms 31 are limited by the relationship between the distance c and the distance d, the relationship between the distance e and the distance f, the range of the distance g and the range of the distance h, so that the supporting prisms 31 can provide better supporting effect for the light guide plate body 10, avoiding the occurrence of bright white spot defects in the part of the display device corresponding to the effective light output area 121.

[0084] It should be noted that, although the embodiments of the present application do not provide examples, it is understandable that the above two implementations can be used independently or in combination. The above two implementations can be used in combination, that is, the widths of the multiple supporting prisms 31 distributed along the first direction X increase successively and the distribution density increases successively.

[0085] For an alternative embodiment, see Fig. 9, which shows a three-dimensional schematic diagram of a supporting prism 31 provided in an embodiment of the present application. The supporting prism 31 includes a first portion 311, a second portion 312 and a third portion 313 which are sequentially connected and smoothly transitioned along a first direction X. The first portion 311 and the third portion 313 are symmetrical about the second portion 312. Please refer to Fig.10 and Fig.11 , Fig.10 Shows Figure 7 A schematic diagram of the projection of the structure in the area A on the plane where the first side surface 15 (or the second side surface 16) of the light guide plate body 10 is located, Fig.11 Shows Figure 7 Schematic diagram of the projection of the structure in the region A on the plane where the light incident surface 11 is located. Fig. 9 and Fig.11 As shown, the side of the first portion 311 away from the light emitting surface 12 is a curved surface, and the side of the second portion 312 away from the light emitting surface 12 is a semi-cylindrical surface. The orthographic projection of the side of the first portion 311 away from the light emitting surface 12 on the plane where the light incident surface 11 is located is an arch (see Fig.11 ), the radius of curvature R of the arch (not shown in the figure), the height H of the arch and the width D of the arch satisfy: The supporting prism 31 that satisfies the relationship can be manufactured using a precision machining machine without the need for photolithography, and the manufacturing cost is low. Among them, the semi-cylindrical surface refers to a structure obtained by cutting a part of a cylinder along a plane parallel to the central rotation axis of the cylindrical surface, and the size of the semi-cylindrical surface of the second part 312 in the direction from the grid point surface 13 to the light-emitting surface 12 is less than or equal to the radius of the corresponding cylinder. Of course, the supporting prism 31 can also have other morphologies besides the above morphologies, for example, a hemispherical morphology or a semi-ellipsoidal morphology.

[0086] In the embodiment of the present application, on the one hand, the second part 312 of the support prism 31 is a semi-cylindrical surface away from the light-emitting surface 12. After the optical module is assembled on the backlight module, the support prism 31 and the reflector are in line contact rather than point contact, which can improve the support effect and avoid the breakage or damage of the reflector due to the large stress on the reflector caused by the point contact. On the other hand, the support prism 31 with the above-mentioned morphology has better control over the reflection of light, so that the support prism 31 has better dimming ability, and can also make a certain contribution to the uniformity of the brightness of the light emitted from the light-emitting surface 12 while playing a supporting role.

[0087] In an optional embodiment, if Fig.11As shown, the height H of the supporting prism 31 is 4% to 8% of the thickness T of the optical module, for example, 4%, 6% or 8%. The thickness T of the optical module is the maximum distance between the light-emitting surface 12 and the side of the supporting prism 31 away from the light-emitting surface 12, and the thickness T of the optical module is the size of the optical module perpendicular to the light-emitting surface 12. The width D of the supporting prism 31 ranges from 50 microns to 200 microns, for example, 50 microns, 100 microns or 150 microns. Taking the thickness of the optical module as 0.5 mm as an example, the height H of the supporting prism 31 ranges from 20 microns to 40 microns, which is several times the height of the dot 20 (the height of the dot 20 is usually 8 microns to 10 microns). Therefore, after the optical module is assembled in the backlight module, the supporting prism 31 can make the gap between the light guide plate body 10 and the reflective sheet larger, which can have a better improvement effect on the poor bright white point.

[0088] In the embodiment of the present application, the above-mentioned range of the percentage value of the height H of the support prism 31 and the thickness T of the optical module can take into account the improvement effect and applicability of the support prism 31 on the poor bright white point. For example, if the percentage value of the height of the support prism 31 and the thickness of the optical module is less than 4%, compared with the dot 20, the support effect of the support prism 31 is not obvious, and the improvement effect on the poor bright white point is limited, but it will increase the structural complexity of the optical module. For another example, if the percentage value of the height of the support prism 31 and the thickness of the optical module is higher than 8%, it will increase the difficulty of processing, and in some cases it will easily cause the thickness of the backlight module to exceed the standard specifications, which is not conducive to practical application. In addition, the range of the width of the support prism 31 can match the range of the height of the support prism 31, so as to facilitate the processing and forming of the support prism 31.

[0089] See also Fig.12 , which shows a flow chart of a method for manufacturing an optical module provided in an embodiment of the present application. The method for manufacturing an optical module can be used to manufacture the optical module provided in the above-mentioned embodiment. Fig.12 The manufacturing method of the optical module includes the following steps S1201 to S1202.

[0090] S1201. A light guide plate body is formed, wherein the light guide plate body has a light incident surface, a light emitting surface and a dot surface, wherein the light emitting surface is opposite to the dot surface, the light incident surface intersects with the light emitting surface, and the light incident surface intersects with the dot surface, and the dot surface has dots, which protrude toward a side away from the light emitting surface.

[0091] See also Figure 3 and Figure 4The light guide plate body 10 has a light incident surface 11, a light emitting surface 12 and a dot surface 13. The light emitting surface 12 is opposite to the dot surface 13. The light incident surface 11 intersects with the light emitting surface 12, and the light incident surface 11 intersects with the dot surface 13. The dot surface 13 has dots 20. The dots 20 protrude toward a side away from the light emitting surface 12.

[0092] S1202. Form supporting prisms on the dot surface. The supporting prisms are distributed in the same layer as the dots, the supporting prisms protrude toward the side away from the light-emitting surface, and the height of the supporting prisms is greater than the height of the dots, wherein on the dot surface, there is at least one supporting prism per unit area, and along a first direction, the ability of the supporting prisms per unit area to adjust the light brightness increases in sequence, and the first direction is the direction from the light-entering surface to the surface opposite to the light-entering surface.

[0093] See also Figure 3 and Figure 4 A supporting prism 31 is formed on the dot surface 13, and the supporting prism 31 is distributed in the same layer as the dot 20. The supporting prism 31 protrudes toward the side away from the light exiting surface 12. The height of the supporting prism 31 is greater than the height of the dot 20. There is at least one supporting prism 31 per unit area on the dot surface 13, and the ability of the supporting prism 31 per unit area to adjust the light brightness increases in sequence along the first direction X, and the first direction X is the direction from the light incident surface 11 to the opposite surface 14 of the light incident surface 11.

[0094] In an optional embodiment, the light guide plate body 10 and the supporting prism 31 are an integral structure. The light guide plate body 10 and the supporting prism 31 are manufactured by the same injection molding step. In a specific embodiment, first, an injection molding mold for manufacturing an optical module is provided. Then, the material for manufacturing the optical module is melted and injected into the injection molding mold, and the material injected into the injection molding mold is demolded after cooling and solidifying to obtain the optical module. In an optional embodiment, the optical module is ground and polished to remove the uneven structure on its surface, improve the surface smoothness and surface quality, eliminate the internal stress generated during the injection molding process, and improve the structural stability of the optical module.

[0095] The embodiment of the present application adopts the injection molding method to form the optical module, which can ensure the consistency of the quality of the optical module while producing the optical module in large quantities and with high efficiency. On the other hand, when forming the optical module with the supporting prism 31 having the aforementioned morphology, the process difficulty will not be significantly increased, and it is suitable for large-scale and high-quality production.

[0096] In an optional embodiment, before the optical module is manufactured by injection molding, the injection molding mold is formed. The injection molding mold has a template and a mold core. The mold core is assembled on the template. The mold core has a first groove, a plurality of second grooves and a plurality of third grooves. The first groove opens from the first surface of the mold core and extends to the side of the opposite surface close to the first surface in a direction perpendicular to the first surface. The second groove and the third groove both open from the groove bottom of the first groove and extend to the side of the opposite surface close to the first surface in a direction perpendicular to the first surface, and the extension depth of the third groove is greater than the extension depth of the second groove. Moreover, at least one second groove is distributed between any two adjacent third grooves. Among them, the mold core is used to define the morphology of the optical module, the first groove and the second groove jointly define the morphology of the light guide plate body 10, the second groove is used to define the morphology of the dot 20, and the third groove is used to define the morphology of the supporting prism 31. In a specific embodiment, optical design (for example, theoretical calculation or simulation) is first performed to determine the structural parameters of the optical module (including the size and morphology of the supporting prism 31). Then, a simulation model of the optical module is constructed based on the structural parameters of the optical module. Then, the simulation model is stored in the control device of the precision machining machine, and the control device controls the precision machining machine to process the substrate based on the simulation model to obtain the above-mentioned mold core. In addition, in the process of the precision machining machine processing the third groove on the substrate, a tool (for example, a diamond knife) with a hemisphere (or a partial sphere less than a hemisphere) with a radius of R' is used to form the above-mentioned third groove. The radius R' of the hemisphere is equal to the radius of curvature R of the arch described in the above-mentioned embodiment. For example, when the distribution density of the supporting prisms 31 distributed along the first direction X on the dot surface 13 increases successively, and the size and structure of the multiple supporting prisms 31 are the same, in the process of processing the substrate by the precision machining machine, one tool is used to complete the processing of the above-mentioned multiple third grooves. For another example, when the width of the multiple supporting prisms 31 distributed along the first direction X on the dot surface 13 increases successively, in the process of processing the substrate by the precision machining machine, multiple tools can be used to complete the processing of the above-mentioned multiple third grooves. Furthermore, the first groove and the second groove can be formed by laser engraving or laser engraving. The third groove can be formed before the second groove is formed, or after the second groove is formed. Then, the mold core is assembled on the template to obtain the injection molding mold.

[0097] The present application also provides a backlight module. Fig.13 , which shows a schematic diagram of a backlight module 40 provided in an embodiment of the present application. The backlight module 40 includes a reflective sheet 50 and an optical module provided in the aforementioned embodiment. The reflective sheet 50 is located on the side where the grid dot surface 13 of the light guide plate body 10 is located, and the reflective sheet 50 abuts against the supporting prism 31 on the grid dot surface 13 of the light guide plate body 10.

[0098] In the embodiment of the present application, since the optical module includes a light guide plate body 10 and a supporting prism 31, the supporting prism 31 is located on the mesh surface 13 of the light guide plate body 10. The mesh surface 13 of the light guide plate body 10 includes mesh dots 20, and the supporting prism 31 is distributed in the same layer as the mesh dots 20. The mesh dots 20 and the supporting prism 31 both protrude toward the side away from the light emitting surface 12 of the light guide plate body 10, and the height of the supporting prism 31 is greater than the height of the mesh dots 20. Under the action of the supporting prism 31, the gap between the light guide plate body 10 and the reflective sheet 50 is larger, which reduces the probability of the light guide plate body 10 being scratched due to friction between foreign matter in the gap and the light guide plate body 10. Therefore, the backlight module 40 is applied to the display device to reduce the probability of poor bright white points and ensure the overall display effect of the display device. Moreover, since the gap between the light guide plate body 10 and the reflective sheet 50 is relatively large, the probability of scratching the reflective sheet 50 due to friction between foreign matter in the gap and the reflective sheet 50 is reduced. The reflective sheet 50 can have a better reflection effect on the light passing through the grid surface 13 of the light guide plate body 10, thereby ensuring the light output efficiency of the optical module.

[0099] In an optional embodiment, the backlight module 40 is an edge-type backlight module. Fig.13 As shown, the backlight module 40 also includes a light source 41 located on the side of the light incident surface 11 of the light guide plate body 10 in the optical module. The light source 41 can be a light emitting diode (LED). The light source 41 is used to emit light from the light incident surface 11 into the optical module. The optical module is used to guide the light emitted by the light source 41 so that the light is emitted from the light emitting surface 12 of the light guide plate body 10 in the optical module. In the process of the light emitted by the light source 41 propagating in the optical module, the dots 20 on the dot surface 13 of the light guide plate body 10 and the supporting prism 31 both reflect and scatter the light, thereby adjusting the propagation path of the light in the optical module.

[0100] In an optional embodiment, if Fig.13 As shown, the backlight module 40 also includes a diffuser 42 and a prism sheet 43. The diffuser 42 and the prism sheet 43 are both located on the side where the light emitting surface 12 of the light guide plate body 10 in the optical module is located, and the diffuser 42 is located between the optical module and the prism sheet 43. The diffuser 42 is used to diffuse the light emitted from the optical module. The prism sheet 43 is used to adjust the direction of the light diffused by the diffuser 42. The luminous efficiency and luminous uniformity of the backlight module 40 are improved by the diffuser 42 and the prism sheet 43, thereby improving the display effect of the display device.

[0101] It should be noted that the structure of the backlight module 40 described in this article is merely exemplary. In actual applications, the backlight module 40 may include more structures than the backlight module 40 described in this article. For example, the backlight module 40 may also include structures such as a rubber frame, a protective sheet, and a light-shielding tape, which will not be repeated here.

[0102] The present application also provides a display device. Fig.14 , which shows a schematic diagram of a display device provided by an embodiment of the present application. The display device 60 includes: a display panel 70, and, Fig.13 The backlight module 40 shown in FIG. 4 shows a display panel 70 located on a light emitting surface side of the backlight module 40 .

[0103] For example, the display device 60 may be any product or component with a display function, such as a mobile phone, a tablet computer, a laptop computer, a monitor, a television, a navigator, etc. The display panel 70 may be a liquid crystal panel, which includes an array substrate ( Fig.14 Not shown) and color film substrate ( Fig.14 ), and a liquid crystal layer ( Fig.14 Structures not shown in FIG.

[0104] The display device 60 is equipped with the aforementioned backlight module 40. Since the gap between the light guide plate body 10 and the reflective sheet 50 in the backlight module 40 is relatively large, the probability of the light guide plate body 10 being scratched due to friction between foreign matter in the gap and the light guide plate body 10 is reduced, thereby improving the poor bright white point and achieving a better display effect of the display device 60.

[0105] To sum up, the present application is not limited in any form. Although the present application has been disclosed as above through the embodiments, it is not used to limit the present application. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes by using the technical contents disclosed above without departing from the scope of the technical solution of the present application. However, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of the technical solution of the present application.

Claims

1. An optical module, characterized in that: include: A light guide plate body (10), the light guide plate body (10) having a light incident surface (11), a light emitting surface (12) and a dot surface (13), the light emitting surface (12) being opposite to the dot surface (13), the light incident surface (11) intersecting with the light emitting surface (12), and the light incident surface (11) intersecting with the dot surface (13), the dot surface (13) having dots (20), the dots (20) protruding toward a side away from the light emitting surface (12); A supporting prism (31) is located on the mesh point surface (13), the supporting prism (31) and the mesh points (20) are distributed in the same layer, the supporting prism (31) protrudes toward a side away from the light exiting surface (12), the height of the supporting prism (31) is greater than the height of the mesh points (20), wherein on the mesh point surface (13), there is at least one supporting prism (31) per unit area, and along a first direction (X), the light brightness adjustment capability of the supporting prism (31) per unit area increases successively, and the first direction (X) is the direction from the light incident surface (11) to the surface (14) opposite to the light incident surface (11).

2. The optical module according to claim 1, characterized in that: The supporting prism (31) comprises a first part (311), a second part (312) and a third part (313) which are sequentially connected and smoothly transitioned along the first direction (X), and the first part (311) and the third part (313) are symmetrical with respect to the second part (312); A side of the first part (311) away from the light emitting surface (12) is a curved surface, and a side of the second part (312) away from the light emitting surface (12) is a semi-cylindrical surface; The orthographic projection of a side of the first portion (311) away from the light emitting surface (12) on the plane where the light incident surface (11) is located is arched, and along the first direction (X), the distance between the side of the first portion (311) away from the light emitting surface (12) and the light emitting surface (12) increases successively.

3. The optical module according to claim 2, characterized in that: The radius of curvature R of the arch, the height H of the arch and the width D of the arch satisfy:

4. The optical module according to any one of claims 1 to 3, characterized in that: The optical module comprises a plurality of supporting prisms (31) distributed along the first direction (X), and along the first direction (X), the coverage rate of the supporting prisms (31) per unit area on the grid point surface (13) increases successively.

5. The optical module according to claim 4, characterized in that: The widths of the plurality of supporting prisms (31) distributed along the first direction (X) increase sequentially, and the width of the supporting prism (31) is the dimension of the supporting prism (31) perpendicular to the first direction (X).

6. The optical module according to claim 4, characterized in that: The distribution density of the plurality of supporting prisms (31) distributed along the first direction (X) increases successively, and the distribution density of the supporting prisms (31) is the number of the supporting prisms (31) within the unit area.

7. The optical module according to any one of claims 1 to 6, characterized in that: The optical module comprises a plurality of supporting prism groups (30) arranged along the first direction (X), each of the supporting prism groups (30) comprises a plurality of supporting prisms (31) arranged along a second direction (Y), and the second direction intersects with the first direction; The widths of the supporting prisms (31) in the plurality of supporting prism groups (30) increase sequentially.

8. The optical module according to claim 7, characterized in that: The plurality of supporting prism groups (30) are arranged at equal intervals; and the supporting prisms (31) within the same supporting prism group (30) are arranged at equal intervals.

9. The optical module according to claim 7 or 8, characterized in that: The distance between any two adjacent supporting prism groups (30) ranges from 5 mm to 10 mm; The distance between any two adjacent supporting prisms (31) in the same supporting prism group (30) is greater than or equal to 5 millimeters.

10. The optical module according to any one of claims 7 to 9, characterized in that: The light emitting surface (12) has an effective light emitting area (121), and the effective light emitting area (121) has a first edge (121a) close to the light incident surface (11) and a second edge (121b) close to the opposite surface (14); The distance between a first supporting prism group (30a) among the plurality of supporting prism groups (30) and the light incident surface (11) is greater than the distance between the first edge (121a) and the light incident surface (11); The distance between a second supporting prism group (30b) in the plurality of supporting prism groups (30) and the opposite surface (14) is greater than the distance between the second edge (121b) and the opposite surface (14); The first supporting prism group (30a) is the supporting prism group (30) closest to the light incident surface (11) among the multiple supporting prism groups (30), and the second supporting prism group (30b) is the supporting prism group (30) closest to the opposite surface (14) among the multiple supporting prism groups (30).

11. The optical module according to any one of claims 7 to 10, characterized in that: The light guide plate body (10) further comprises a first side surface (15) and a second side surface (16), wherein the first side surface (15) is opposite to the second side surface (16), the first side surface (15) intersects with the light incident surface (11), the light emitting surface (12), the dot surface (13) and the opposite surface (14) respectively, and the second side surface (16) intersects with the light incident surface (11), the light emitting surface (12), the dot surface (13) and the opposite surface (14) respectively; In each of the supporting prism groups (30), the distance between the supporting prism (31) closest to the first side surface (112) and the first side surface (15) ranges from 0 mm to 5 mm, and the distance between the supporting prism (31) closest to the second side surface (113) and the second side surface (16) ranges from 0 mm to 5 mm.

12. The optical module according to any one of claims 1 to 11, characterized in that: The height of the supporting prism (31) is 4% to 8% of the thickness of the optical module; the width of the supporting prism (31) is in the range of 50 micrometers to 200 micrometers.

13. A method for manufacturing an optical module, characterized in that: include: A light guide plate body (10) is formed, wherein the light guide plate body (10) has a light incident surface (11), a light emitting surface (12) and a dot surface (13), wherein the light emitting surface (12) is opposite to the dot surface (13), the light incident surface (11) intersects with the light emitting surface (12), and the light incident surface (11) intersects with the dot surface (13), and the dot surface (13) has dots (20), and the dots (20) protrude toward a side away from the light emitting surface (12); A supporting prism (31) is formed on the mesh dot surface (13), the supporting prism (31) and the mesh dots (20) are distributed in the same layer, on the mesh dot surface (13), the supporting prism (31) protrudes toward a side away from the light emitting surface (12), the height of the supporting prism (31) is greater than the height of the mesh dots (20), wherein on the mesh dot surface (13), there is at least one supporting prism (31) per unit area, and in a first direction (X), the light brightness adjustment capability of the supporting prism (31) per unit area increases successively, and the first direction (X) is a direction from the light incident surface (11) to a surface (14) opposite to the light incident surface (11).

14. The manufacturing method according to claim 13, characterized in that: The light guide plate body (10) and the supporting prism (31) are formed through the same injection molding step.

15. A backlight module, characterized in that: The backlight module (40) comprises: a reflective sheet (50), and The optical module according to any one of claims 1 to 12; The reflective sheet (50) is located on the side of the light guide plate body (10) where the grid point surface (13) is located, and the reflective sheet (50) is in contact with the supporting prism (31).

16. A display device, characterized in that: The display device (60) comprises: A display panel (70), and a backlight module (40) as claimed in claim 15.

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