Optical Structure Film and Light Source Module

Abstract

The present invention provides an optical structure film and a light source module. The optical structure film includes a plurality of optical unit microstructures. Each of the plurality of optical unit microstructures has four side surfaces and a light splitting surface that is recessed inward. The light splitting surfaces are respectively connected to the side surfaces and have four end points when viewed from a front view perspective. The connection lines of the four end points form a rectangle, and the light splitting surface includes at least one light splitting curved surface. The intersection of at least one light splitting curved surface and one of the four side surfaces is a first line segment, and the projection of the midpoint of the side line of the rectangle on the light splitting surface overlaps with the relative extreme point of the first line segment. The optical structure film and the light source module proposed by the present invention have the effects of being thin and having good visual effects and uniformity.

Description

Technical Field

[0001] The present invention relates to an optical structure film and a light source module, and particularly to an optical structure film and a light source module having microstructures. Background Art

[0002] Currently, most electronic devices use flat display modules for screen display, among which the technology of liquid crystal display modules is relatively mature and popular. However, since the display panel of the liquid crystal display module itself cannot emit light, a backlight module is provided below the display panel to provide the light required for the display screen.

[0003] In recent years, due to the good characteristics of submillimeter light-emitting diodes such as good local dimming and high contrast, the industry has begun to research and develop the structure of a direct-lit backlight module using submillimeter light-emitting diodes (Mini LEDs) as light-emitting elements to meet the requirements of current high dynamic range imaging specifications. However, since the light source architecture using submillimeter light-emitting diodes as light-emitting elements is formed by arranging point light sources in an array, bright spot defects are likely to appear directly above each submillimeter light-emitting diode, affecting the visual effect and uniformity. Therefore, various technical solutions for eliminating the bright spots have emerged.

[0004] For example, one solution is to place a diffusion film with printed dots on the light-emitting element to use the light-shielding dots to shield the bright spots generated by the light-emitting element. However, since the position and distribution requirements of the light-shielding dots are designed to cope with the bright spots caused by the light-emitting element, there are requirements for alignment. Thus, the requirements for the placement accuracy of the light-emitting element and the tolerance of module assembly are relatively high; once an alignment error occurs, the light-shielding of the dots will be incomplete, which will instead have a greater impact on the visual effect and uniformity.

[0005] The second is to use an optical microstructure with light splitting characteristics such as a V-groove (lenti) structure or a pyramid structure to form an optical structure film to split the bright spots generated by the light-emitting element, and other optical films can be used to atomize the bright spots. However, the bright spots split by the V-groove structure or the pyramid structure will form obvious ghost images, which are likely to affect the uniformity.

[0006] The third is to add scattering particles to the optical film, and use the randomly scattered light after the light hits the scattering particles to achieve the effect of suppressing the bright spot phenomenon. However, when the concentration of the scattering particles reaches a certain level, the diffusion ability often cannot be effectively improved, so the effect of suppressing the bright spot phenomenon is limited.

[0007] The "Background Art" paragraph is only used to help understand the content of the present invention. Therefore, the content disclosed in the "Background Art" paragraph may include some that do not constitute the prior art known to those skilled in the art. The content disclosed in the "Background Art" paragraph does not mean that the problems to be solved by this content or one or more embodiments of the present invention were known or recognized by those skilled in the art before the filing of the present invention application. Summary of the Invention

[0008] The present invention provides an optical structure film that can suppress the bright spot phenomenon formed by light-emitting elements.

[0009] The present invention provides a light source module that has the advantages of being thin and having good visual effects and uniformity.

[0010] Other objects and advantages of the present invention can be further understood from the technical features disclosed in the present invention.

[0011] To achieve one or some or all of the above objects or other objects, an embodiment of the present invention provides an optical structure film. The optical structure film includes a plurality of optical unit microstructures. Each of the plurality of optical unit microstructures has four side surfaces and a light splitting surface that is recessed inward. The light splitting surfaces are respectively connected to the side surfaces and have four end points when viewed from a front view angle. The connection lines of the four end points form a rectangle, and the light splitting surface includes at least one light splitting curved surface. The intersection of at least one light splitting curved surface and one of the four side surfaces is a first line segment, and the projection of the midpoint of the side line of the rectangle on the light splitting surface overlaps with the relative extreme point of the first line segment.

[0012] To achieve one or some or all of the above objects or other objects, an embodiment of the present invention provides a light source module. The light source module includes a plurality of light-emitting elements and the aforementioned optical structure film. The plurality of light-emitting elements are used to provide light beams. The optical structure film is located on the transmission path of the light beams and further includes a substrate. The substrate has a first surface and a second surface that face away from each other, and the first surface faces the plurality of light-emitting elements.

[0013] Based on the above, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the light beam emitted by the light-emitting element can be dispersed into a light spot by the light-splitting surface of the micro-structure of the optical unit of the optical structure film. Moreover, through the structural design of the light-splitting curved surface of the light-splitting surface of the micro-structure of the optical unit, the brightness per unit area within the light spot range can be effectively reduced. And, the micro-structures of the optical unit can be closely arranged. In this way, alignment is not required, thereby reducing the requirements for the placement accuracy of the light-emitting element and the tolerances of module assembly. Also, in this case, when the pitch of the light-emitting elements is increased, no obvious bright spot phenomenon will occur, and thus the cost formed by the number of light-emitting elements can be reduced. Or, when the number of light-emitting elements is fixed and the pitch is small, the uniformity of the light-emitting elements can be further improved, thereby achieving a better visual effect. And, through the above configuration, the optical mixing distance of the light source module can be effectively shortened, and thus the module thickness of the light source module can be reduced.

[0014] To make the above features and advantages of the present invention more obvious and understandable, specific embodiments are given below and will be described in detail in conjunction with the accompanying views as follows.

[0015] View Explanation

[0016] Figure 1 is a cross-sectional schematic view of a light source module according to an embodiment of the present invention.

[0017] Figure 2A is Figure 1 a three-dimensional schematic view of the micro-structure of the optical unit of an optical structure film.

[0018] Figure 2B is Figure 2A a cross-sectional view of the micro-structure of the optical unit with the diagonal of a rectangle as the cutting line.

[0019] Figure 2C is Figure 2A a side view of the micro-structure of the optical unit.

[0020] Figure 3 is Figure 1 a three-dimensional schematic view of another micro-structure of the optical unit of an optical structure film.

[0021] Figure 4A and Figure 4B is Figure 1 a three-dimensional schematic view of another micro-structure of the optical unit of an optical structure film from different perspectives.

[0022] Figure 4C is Figure 4A a cross-sectional view of the micro-structure of the optical unit with the connection line of the midpoints of the two side surfaces of the micro-structure as the cutting line.

[0023] Figures 5A to 5C is Figure 1 A three-dimensional schematic diagram of the optical unit microstructure of another optical structure film at different viewing angles.

[0024] Figure 5D is Figure 5A A cross-sectional view of the optical unit microstructure of Figure 5A with the diagonal of the rectangle as the section line.

[0025] Figure 5E is Figure 5A A side view of the optical unit microstructure of Figure 5A .

[0026] Figure 6A is Figure 1 A front view schematic diagram of the optical unit microstructure of another optical structure film of Figure 1 .

[0027] Figure 6B is Figure 6A A three-dimensional schematic diagram of the optical unit microstructure of Figure 6A .

[0028] Figure 6C is Figure 6A A side view of the optical unit microstructure of Figure 6A .

[0029] Figure 7 Schematic diagram of the architecture of another light source module according to an embodiment of the present invention.

[0030] Figure 8 Schematic diagram of the architecture of yet another light source module according to an embodiment of the present invention.

[0031] Figure 9A is Figure 8 Arrangement schematic diagram of multiple prism microstructures of Figure 8 .

[0032] Figure 9B and Figure 9C is Figure 9A Side views of a single prism microstructure of Figure 9A at different viewing angles.

[0033] Figure 10A Schematic diagram of the architecture of yet another light source module according to an embodiment of the present invention.

[0034] Figure 10B is Figure 10A Front view schematic diagram of the grating structure of Figure 10A . Detailed implementation manners

[0035] The foregoing and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of a preferred embodiment with reference to the accompanying views. The directional terms (such as: up, down, left, right, front or back, etc.) mentioned in the following embodiments are only with reference to the directions of the attached views. Therefore, the directional terms used are for illustration rather than for limiting the present invention.

[0036] Figure 1 is a schematic cross-sectional view of a light source module according to an embodiment of the present invention. Figure 2A is Figure 1 a three-dimensional schematic view of the microstructure of an optical unit of an optical structure film. Figure 2B is Figure 2A a cross-sectional view of the microstructure of the optical unit with the diagonal of the rectangle as the cutting line. Figure 2C is Figure 2A a side view of the microstructure of the optical unit. Please refer to Figure 1 , in this embodiment, the light source module 200 includes a light-emitting element base 210, a plurality of light-emitting elements 220 and an optical structure film 100. The plurality of light-emitting elements 220 are located on the light-emitting element base 210 and are used to provide light beams respectively. In this embodiment, the light-emitting element 220 is, for example, a sub-millimeter light-emitting diode.

[0037] Specifically, as Figure 1 shown, in this embodiment, the optical structure film 100 is located on the light beam transmission path and includes a plurality of optical unit microstructures 110 and a substrate 120. The substrate 120 has a first surface S1 and a second surface S2 facing away from each other. The first surface S1 faces the plurality of light-emitting elements 220, and the plurality of optical unit microstructures 110 are formed on the first surface S1. When the light-emitting element 220 emits light, the light beam passes through the optical structure film 100 to disperse the bright spot formed by the light beam into a light spot to provide a uniform surface light source. In other embodiments, the light source module 200 may further include a diffusion film 130, and the second surface S2 of the substrate 120 faces the diffusion film 130, that is, the optical structure film 100 is disposed between the diffusion film 130 and the light-emitting element base 210. The following will be combined with Figures 2A to 2C to further illustrate the detailed structure of the optical unit microstructure 110.

[0038] Specifically, as Figures 2A to 2CAs shown, in this embodiment, each of the multiple optical unit microstructures 110 has four side surfaces SS1, SS2, SS3, SS4 and a beam splitting surface BS that is recessed inward (e.g., recessed toward the center of the optical unit microstructure 110). The four side surfaces SS1, SS2, SS3, SS4 are, for example, perpendicular to the first surface S1 of the substrate 120 respectively, and the four side surfaces SS1, SS2, SS3, SS4 are, for example, perpendicular or parallel to each other. The beam splitting surface BS is connected to the side surfaces SS1, SS2, SS3, SS4 respectively, and the beam splitting surface BS has four end points P1, P2, P3, P4 when viewed from a front view angle (e.g., along the normal direction of the first surface S1 of the substrate 120). The connection lines of the four end points P1, P2, P3, P4 form a rectangle RL (e.g., a square). In other words, the rectangle RL is the contour of the optical unit microstructure 110 when viewed from the front (the four side lines of the rectangle RL correspond to the four side surfaces SS1, SS2, SS3, SS4 respectively). The beam splitting surface BS includes at least one beam splitting curved surface CS and multiple beam splitting inclined surfaces TS. Further, in this embodiment, as Figure 2A shown in Figure 2C , the number of at least one beam splitting curved surface CS is 4, and the intersection of at least one beam splitting curved surface CS and one of the four side surfaces SS1, SS2, SS3, SS4, i.e., side surface SS1, is the first line segment LS1, and the orthographic projection of the midpoint LMP1 of the side line of the rectangle RL on the beam splitting surface BS overlaps with the relative extreme point LSP1 of the first line segment LS1 (the corresponding relationships between the midpoints LMP2, LMP3, LMP4 of the side lines of the rectangle RL and the relative extreme points LSP2, LSP3, LSP4 are similar to the above and will not be elaborated here). In this embodiment, the relative extreme point LSP1 of the first line segment LS1 is Figure 2C the lowest point on the side surface SS1 shown in Figure 1 , that is, the position on the side surface SS1 shown in Figure 2A that is farthest from the multiple light emitting elements 220 (the same applies to the relative extreme points LSP2, LSP3, LSP4). On the other hand, as Figure 2B shown in Figure 2B , in this embodiment, the multiple beam splitting inclined surfaces TS intersect at the relative extreme point CP1 of the beam splitting surface BS, and the orthographic projection of the intersection point CP of the diagonal of the rectangle RL on the beam splitting surface BS overlaps with the relative extreme point CP1 of the beam splitting surface BS. Here, the relative extreme point CP1 of the beam splitting surface BS is Figure 1The position on the beam splitting surface BS that is farthest from the plurality of light emitting elements 220. Specifically, the plurality of optical unit microstructures 110 are, for example, arranged in a matrix and connected to each other. For example, the side surface SS1 of the optical unit microstructure 110 is connected to the side surface SS3 of the adjacent optical unit microstructure 110 (i.e., the end point P1 of the optical unit microstructure 110 and the end point P2 of the adjacent optical unit microstructure 110 are co - points), thus forming a matrix arrangement (for example, a two - dimensional matrix arrangement).

[0039] And, as Figure 2A shown in Figure 2B In this embodiment, on the cross - section with the diagonal line of the rectangle RL (for example, the line connecting the end points P2 and P4) as the cutting line (this cross - section is, for example, perpendicular to the first surface S1 of the substrate 120), the curve of the beam splitting curved surface CS is a sine curve, and the end points P2, P4 (and end points P1, P3) of the beam splitting surface BS are the relative extreme points of the sine curve (i.e., Figure 2A shown in Figure 2B the highest points of the beam splitting surface BS of the optical unit microstructure 110), and the projections of the perpendicular bisectors LM1, LM2 of the side lines of the rectangle RL on the beam splitting surface BS overlap with the projections of the intersection lines of the adjacent beam splitting inclined surfaces TS on the beam splitting surface BS. In addition, as Figure 2A shown in Figure 2A In this embodiment, the plurality of beam splitting inclined surfaces TS include four triangular inclined surfaces, and a pyramid that is concave inward is formed on the beam splitting surface BS. The vertex PMP of the pyramid is the relative extreme point CP1 of the beam splitting surface BS (i.e., Figure 2B shown in Figure 2B the lowest point of the beam splitting surface BS of the optical unit microstructure 110), and the mid - points MP1, MP2, MP3, MP4 of the four bottom edges of the pyramid are located on the diagonal line of the rectangle RL and are the intersection points with the sine curve. And, as shown in

[0040] In this embodiment, on the cross - section with the diagonal line of the rectangle RL as the cutting line, the contour of the pyramid has a first included angle θ1, and the range of the first included angle θ1 is between 45 degrees and 135 degrees, and the preferred value is 90 degrees.On the other hand, in the present embodiment, the relative extreme point LSP1 of the first line segment LS1 is one of the vertices of the triangular inclined surface other than the vertex of the pyramid (i.e., in the embodiment of the pyramid composed of four triangular inclined surfaces, the extreme points LSP1, LSP2, LSP3, and LSP4 are the four vertices PM1, PM2, PM3, and PM4 of the pyramid), and it is also the saddle point of the light splitting surface CS. Thus, since the side lines of the inwardly concave pyramid exactly pass through the inflection points of the light splitting surface CS (for example, the midpoints MP1, MP2, MP3, MP4 and the extreme points LSP1, LSP2, LSP3, LSP4), at this time, taking the side lines of the pyramid as the boundary, one half of the optical unit microstructure 110 is the light splitting surface CS, and the other half is the light splitting inclined surface TS of the inwardly concave pyramid. The light splitting surface CS is closer to the light emitting element 220 than the light splitting inclined surface TS, and the proportion of the light splitting surface CS and the light splitting inclined surface TS in the optical unit microstructure 110 is approximately equal. Therefore, the light splitting surface BS can have the light splitting characteristics of the mixture of both the light splitting surface CS and the light splitting inclined surface TS.

[0041] In this way, when the light emitting element 220 emits light, the light beam can disperse the bright spot formed by the light beam into a light spot through the light splitting surface BS of the optical unit microstructure 110 of the optical structure film 100. And, in the present embodiment, through the structural design of the light splitting surface CS of the light splitting surface BS of the optical unit microstructure 110, the brightness per unit area within the light spot range can be effectively reduced. And, in the present embodiment, the optical unit microstructures 110 can be closely arranged. Thus, it is not necessary to align with the light emitting element 220, and the requirements for the bonding accuracy of the light emitting element 220 and the tolerance of module assembly can be reduced. For example, the width of the light emitting element 220 is 2 times or more than 5 times the width of the optical unit microstructure 110. And, the cost formed by the number of the light emitting elements 220 can be reduced without obvious bright spot phenomenon when the pitch of the light emitting elements 220 is increased. Or, when the number of the light emitting elements 220 remains fixed and has a smaller pitch, the uniformity of the light emitting elements 220 can be further improved, thereby achieving a better visual effect. And, through the above configuration, the mixing distance (optical distance) required by the light source module 200 can be effectively shortened, and thus the module thickness of the light source module 200 can be reduced.

[0042] Accordingly, in the present embodiment, the configuration of the optical unit microstructure 110 passed by the light source module 200 can suppress the bright spot phenomenon formed by the light emitting element 220, so that the light source module 200 has the advantages of being thin, good visual effect and uniformity.

[0043] In addition, it is worth noting that in the foregoing embodiments, although the four vertices PM1, PM2, PM3, and PM4 of the bottom surface of the pyramid are exemplified as being collinear with the saddle point of the spectral splitting surface CS, the present invention is not limited thereto. In other embodiments, the four vertices PM1, PM2, PM3, and PM4 of the bottom surface of the pyramid may not be collinear with the relative extreme points LSP1, LSP2, LSP3, and LSP4 of the first line segment LS1.

[0044] Figure 3 is Figure 1 Another three-dimensional schematic diagram of the micro-structure of the optical unit of the optical structure film. Please refer to Figure 3 In this embodiment, the micro-structure 310 of the optical unit is similar to the micro-structure 110 of the optical unit of Figure 2A and the differences between the two are described as follows. As shown in Figure 3 , in this embodiment, the four vertices PM1', PM2', PM3', and PM4' of the bottom surface of the inwardly concave pyramid of the micro-structure 310 of the optical unit can move towards the center of the spectral splitting surface BS. Thus, the spectral splitting characteristics contributed by the spectral splitting inclined surface TS' will decrease, and the spectral splitting characteristics of the micro-structure 110 of the optical unit will be closer to the spectral splitting characteristics exhibited by the spectral splitting surface CS' formed by the free-form surface. Thus, when the micro-structure 310 of the optical unit is applied to the optical structure film 100 of Figure 1 , the optical structure film 100 and the light source module 200 can also achieve the same effects and advantages as described above, which will not be elaborated here. In other embodiments, the four vertices PM1', PM2', PM3', and PM4' of the bottom surface of the pyramid can move in a direction away from the center of the spectral splitting surface BS, and the spectral splitting characteristics of the micro-structure 110 of the optical unit will be closer to the spectral splitting characteristics exhibited by the spectral splitting inclined surface TS'.

[0045] In addition, in the foregoing embodiments, although each spectral splitting inclined surface TS, TS' is exemplified as having a structure forming a pyramid, the present invention is not limited thereto. In other embodiments, each spectral splitting inclined surface TS can also form different structures.

[0046] Figure 4A and Figure 4B is Figure 1 Three-dimensional schematic diagrams of the micro-structure of the optical unit of an optical structure film from different perspectives. Figure 4C is Figure 4A A cross-sectional view of the micro-structure of the optical unit of Figures 4A to 4C with the section line being the line connecting the midpoints of the two side surfaces of the micro-structure. Please refer to Figure 2A In this embodiment, the micro-structure 410 of the optical unit is similar to the micro-structure 110 of the optical unit of Figures 4A to 4CAs shown, in this embodiment, each beam splitting inclined surface TS has a plurality of sub-inclined surfaces STS. The projection of the diagonal of the rectangle formed by connecting the four endpoints P1, P2, P3, and P4 on the beam splitting surface BS overlaps with the projection on the beam splitting surface BS of the intersection line of adjacent sub-inclined surfaces STS among the plurality of beam splitting inclined surfaces TS (for example, the sub-inclined surface STS with the relative extreme point CP1 as the vertex). In other words, as Figures 4A to 4C shown, the plurality of sub-inclined surfaces STS of the plurality of beam splitting inclined surfaces TS can form a conical tower-like structure of a polyhedron that is concave inward on the beam splitting surface BS. In this embodiment, the conical tower-like structure has, for example, twelve sub-inclined surfaces STS, and the vertices of eight sub-inclined surfaces STS are collinear with the relative extreme point CP1 of the beam splitting surface BS (that is, Figure 4C the lowest point of the beam splitting surface BS of the optical unit microstructure 410 shown).

[0047] Thus, due to the spatial misalignment relationship between the slopes of the plurality of sub-inclined surfaces STS of the conical tower-like structure and the beam splitting curved surface CS, and by increasing the number of the plurality of sub-inclined surfaces STS, the beam splitting effect of the optical unit microstructure 410 can be improved. Thus, when the optical unit microstructure 410 is applied to Figure 1 the optical structure film 100, the optical structure film 100 and the light source module 200 can also achieve the same effects and advantages as described above, which will not be elaborated here.

[0048] Figures 5A to 5C is Figure 1 a three-dimensional schematic diagram of the optical unit microstructure of another optical structure film from different perspectives. Figure 5D is Figure 5A a cross-sectional view of the optical unit microstructure with the diagonal of the rectangle as the section line. Figure 5E is Figure 5A a side view of the optical unit microstructure. Please refer to Figures 5A to 5E , the optical unit microstructure 510 in this embodiment is similar to the optical unit microstructure 110 of Figure 2A , and the differences between the two are as follows. As Figures 5A to 5E shown, in this embodiment, each of the plurality of beam splitting inclined surfaces TS includes two sub-inclined surfaces STS, and the two sub-inclined surfaces STS of each of the plurality of beam splitting inclined surfaces TS respectively form a V-shaped groove structure VT. The relative extreme points of each V-shaped groove structure VT are located at the relative extreme point CP1 of the beam splitting surface BS (as Figure 5C shown), and at least one beam splitting curved surface CS is divided into a plurality of sub-beam splitting curved surfaces (for example, 4) by each V-shaped groove structure VT. Further, in this embodiment, the projection of the diagonal of the rectangle formed by connecting the four endpoints P1, P2, P3, and P4 on the beam splitting surface BS overlaps with the projection on the beam splitting surface BS of the intersection line of the two sub-inclined surfaces STS of each of the plurality of beam splitting inclined surfaces TS, Figure 5CThe highest point (relative extreme point) of the beam-splitting surface BS of the optical unit microstructure 110 shown is the intersection point of each V-groove structure VT and the beam-splitting sub-surface. The four endpoints P1, P2, P3, and P4 of the beam-splitting surface BS are respectively one of the vertices of each V-groove structure VT. In this embodiment, there is a second included angle θ2 between the two sub-inclined surfaces STS of each of the plurality of beam-splitting inclined surfaces TS, and the range of the second included angle θ2 is between 45 degrees and 135 degrees, preferably 50 degrees. Thus, by setting the V-groove structure VT, the number of the beam-splitting inclined surfaces TS and their sub-inclined surfaces STS can be increased, and further the beam-splitting effect of the optical unit microstructure 510 can be improved. And when the optical unit microstructure 510 is applied to Figure 1 the optical structure film 100, the optical structure film 100 and the light source module 200 can also achieve the same effects and advantages as described above, which will not be elaborated here.

[0049] Figure 6A is Figure 1 a front view schematic diagram of the optical unit microstructure of another optical structure film. Figure 6B is Figure 6A a three-dimensional schematic diagram of the optical unit microstructure. Figure 6C is Figure 6A a side view of the optical unit microstructure. Please refer to Figures 6A to 6C , the optical unit microstructure 610 of this embodiment is similar to the optical unit microstructure 510 of Figure 5A , and the differences between the two are described as follows. As Figures 6A to 6C shown, in this embodiment, the perpendicular bisectors LM1 and LM2 of the side lines of the rectangle RL overlap with the projection on the beam-splitting surface BS of the intersection line of the two sub-inclined surfaces STS of each of the plurality of beam-splitting inclined surfaces TS, and the relative extreme points LSP1, LSP2, LSP3, and LSP4 of the first line segment LS1 are one of the vertices of the V-groove structure VT. In this embodiment, there is a second included angle θ2 between the two sub-inclined surfaces STS, and the range of the second included angle θ2 is between 45 degrees and 135 degrees. Thus, due to the setting of the V-groove structure VT, the number of the beam-splitting inclined surfaces TS and their sub-inclined surfaces STS can be increased, and further the beam-splitting effect of the optical unit microstructure 110 can be improved. And when the optical unit microstructure 110 is applied to Figure 1 the optical structure film 100, the optical structure film 100 and the light source module 200 can also achieve the same effects and advantages as described above, which will not be elaborated here.

[0050] Figure 7 is a schematic diagram of the architecture of another light source module according to an embodiment of the present invention. Please refer to Figure 7 , the light source module 800A of this embodiment is similar to the light source module 200 of Figure 1 , and the differences between the two are described as follows. As Figure 7As shown, in this embodiment, a plurality of prism microstructures 740A are formed on the second surface S2 of the substrate 120 of the optical structure film 700A. Thus, by providing the prism microstructures 740A, the outgoing light angle of the light beam passing through the optical unit microstructures 110 can be made positive, thereby increasing the brightness of the light source module 800A in the front view angle. Moreover, in this embodiment, the light beam can also be dispersed into light spots by the light splitting surface BS of the optical unit microstructures 110 of the optical structure film 700A. And, through the structural design of the light splitting curved surface CS of the light splitting surface BS of the optical unit microstructures 110, the brightness per unit area within the light spot range can be effectively decreased, so that the optical structure film 700A and the light source module 800A can have the advantages mentioned for the foregoing optical structure film 100 and light source module 200, which will not be elaborated herein.

[0051] Figure 8 It is a schematic structural diagram of another light source module according to an embodiment of the present invention. Figure 9A is Figure 8 a schematic arrangement diagram of a plurality of prism microstructures. Figure 9B and Figure 9C is Figure 9A a side view of a single prism microstructure of Figure 8 Please refer to Figure 7 , the light source module 800B and the optical structure film 700B of this embodiment are respectively similar to the light source module 800A and the optical structure film 700A of Figure 8 As shown, in this embodiment, a plurality of prism microstructures 740B of the substrate 120 of the optical structure film 700B are arranged in an array to form multiple columns, and the plurality of prism microstructures 740B in adjacent columns are offset from each other.

[0052] Furthermore, as Figures 9A to 9C shown, in this embodiment, each of the plurality of prism microstructures 740B has a plurality of main inclined surfaces MS extending in the extending direction, and each of the plurality of prism microstructures 740B has a plurality of inclined planes ES1, ES2 at the first end E1 and the second end E2 in the extending direction respectively. And when the first end E1 of the plurality of prism microstructures 740B in one column is adjacent to the second end E2 of the plurality of prism microstructures 740B in another column, the plurality of inclined planes ES1 at the first end E1 of the plurality of prism microstructures 740B in one column are connected to the plurality of inclined planes ES2 at the second end E2 of the plurality of prism microstructures 740B in another column in the extending direction. For example, as Figure 9B and Figure 9C shown, in this embodiment, the apex angles of the inclined planes ES1, ES2 Between 45 degrees and 135 degrees, preferably 70 degrees. The angle between the intersection EB1 (or intersection EB2) of the inclined plane ES1 (or inclined plane ES2) at the same end in the extending direction and the plumb line Between 0 degrees and 90 degrees, preferably 35 degrees.

[0053] Thus, by the setting of the prism microstructure 740B, the light output angle of the light beam passing through the optical unit microstructure 110 can also be made positive, thereby increasing the brightness of the light source module 800B in the positive viewing angle. And, in this embodiment, the light beam can also disperse the bright spot formed by the light beam into a light spot through the light splitting surface BS of the optical unit microstructure 110 of the optical structure film 700B. Moreover, through the structural design of the light splitting curved surface CS of the light splitting surface BS of the optical unit microstructure 110, the brightness per unit area within the light spot range can be effectively reduced, so that the optical structure film 700B and the light source module 800B can have the advantages mentioned for the optical structure film 700A and the light source module 800A, which will not be elaborated here. In addition, in this embodiment, since the prism microstructure 740B is arranged in a two-dimensional staggered array, the generation of double images can be avoided, and a certain degree of light spot atomization effect can be provided, thereby being able to more effectively suppress the bright spot phenomenon formed by the light emitting element 220.

[0054] Figure 10A It is a schematic structural diagram of another light source module according to an embodiment of the present invention. Figure 10B is Figure 10A a front view schematic diagram of the grille structure. Please refer to Figure 10A and Figure 10B In this embodiment, the light source module 1000 is similar to the light source module 200 of Figure 1 and the differences between the two are described as follows. As Figure 10A and Figure 10B shown, in this embodiment, the light source module 1000 further includes a plurality of grille structures 1011. The grille structures 1011 are located on the light emitting element base 1010, and each of the plurality of grille structures 1011 has a plurality of reflecting surfaces RS. As Figure 10BAs shown, multiple light-emitting elements 220 are respectively located in each of the multiple grating structures 1011 and are respectively surrounded by multiple reflecting surfaces RS of each of the multiple grating structures 1011. Moreover, by designing the angles of the reflecting surfaces RS of the grating structures 1011, the incident angles of the light-emitting elements 220 on the microstructures 110 of the optical unit can be adjusted, thereby improving the light extraction efficiency. Also, in this embodiment, the light beam can also be dispersed into light spots by the beam splitting surface BS of the microstructures 110 of the optical unit of the optical structure film 100. And, through the structural design of the beam splitting curved surface CS of the beam splitting surface BS of the microstructures 110 of the optical unit, the brightness per unit area within the light spot range can be effectively decreased. Thus, the light source module 1000 can have the advantages mentioned for the aforementioned light source module 200, which will not be elaborated here. Furthermore, by adjusting the optical parameters of the grating structures 1011, the matching degree of the incident angles of the light-emitting elements 220 on the microstructures 110 of the optical unit can be improved, thereby further enhancing the uniformity of the light source module 200.

[0055] Moreover, the aforementioned microstructures 310, 410, 510, 610 of the optical unit can also be applied to Figures 7 to 10B the light source modules 800A, 800B, 1000 to replace the microstructures 110 of the optical unit. When the microstructures 310, 410, 510, 610 of the optical unit are applied to Figures 7 to 10B the optical structure films 800A, 800B, 1000, the optical structure films 700A, 700B and the light source modules 800A, 800B, 1000 can also achieve the same effects and advantages as those described above, which will not be elaborated here.

[0056] In summary, the embodiments of the present invention have at least one of the following advantages or effects. In the embodiments of the present invention, the light beam emitted by the light-emitting element can be dispersed into light spots by the beam splitting surface of the microstructures of the optical unit of the optical structure film. And, through the structural design of the beam splitting curved surface of the beam splitting surface of the microstructures of the optical unit, the brightness per unit area within the light spot range can be effectively decreased. Also, the microstructures of the optical unit can be closely arranged. Thus, alignment is not required, and the requirements for the bonding accuracy of the light-emitting elements and the tolerances of module assembly can be reduced. And, in this way, when the spacing between the light-emitting elements is increased, obvious bright spot phenomena will not occur, thereby reducing the cost formed by the number of light-emitting elements. Or, when the number of light-emitting elements remains fixed and the spacing is small, the uniformity of the light-emitting elements can be further improved, thereby achieving a better visual effect. Moreover, through the above configuration, the mixing distance of the light source module can be effectively shortened, thereby reducing the module thickness of the light source module.

[0057] The above are only the preferred embodiments of the present invention, and the scope of implementation of the present invention cannot be limited thereby. That is, all simple equivalent changes and modifications made in accordance with the claims of the present invention and the specification of the present invention still fall within the scope covered by the patent of the present invention. In addition, any embodiment or claim of the present invention does not have to achieve all the purposes, advantages or features disclosed by the present invention. In addition, the abstract of the specification and the title of the invention are only used to assist in the retrieval of patent documents and do not limit the scope of rights of the present invention. In addition, the terms "first", "second", etc. mentioned in this specification or claims are only used to name elements or distinguish different embodiments or scopes, and do not limit the upper or lower limits of the number of elements.

[0058] View Mark List

[0059] 100, 700A, 700B: Optical Structure Film

[0060] 110, 310, 410, 510, 610: Optical Unit Microstructure

[0061] 120: Substrate

[0062] 130: Diffusion Film

[0063] 200, 800A, 800B, 1000: Light Source Module

[0064] 210: Light Emitting Element Base

[0065] 220: Light Emitting Element

[0066] 740A, 740B: Prism Microstructure

[0067] 1011: Grating Structure

[0068] BS: Beam Splitting Surface

[0069] CP: Intersection Point

[0070] CS: Beam Splitting Curved Surface

[0071] E1: First End

[0072] E2: Second End

[0073] EB1, EB2: Junction

[0074] ES1, ES2: Oblique Plane

[0075] LM1, LM2: Median Perpendicular

[0076] LMP1, LMP2, LMP3, LMP4, MP1, MP2, MP3, MP4: Midpoint

[0077] LS1: First Line Segment

[0078] LSP1, LSP2, LSP3, LSP4, CP1: Relative extreme points

[0079] MS: Main slope

[0080] P1, P2, P3, P4: Endpoints

[0081] PMP, PM1, PM2, PM3, PM4, PM1’, PM2’, PM3’, PM4’: Vertices

[0082] RL: Rectangle

[0083] RS: Reflective surface

[0084] S1: First surface

[0085] S2: Second surface

[0086] SS1, SS2, SS3, SS4: Side surfaces

[0087] STS: Sub-slope

[0088] TS, TS’: Beam-splitting slope

[0089] VT: V-groove structure

[0090] θ1: First included angle

[0091] θ2: Second included angle

[0092] Included angle.

Claims

1. An optical structure film, characterized in that, The optical structure film includes a plurality of optical unit microstructures. Each of the plurality of optical unit microstructures has four side faces and a light splitting surface that is recessed inward. The light splitting surface is respectively connected to the four side faces and has four endpoints when viewed from a front view angle. The connection lines of the four endpoints form a rectangle, and the light splitting surface includes at least one light splitting curved surface. The intersection of the at least one light splitting curved surface and one of the four side faces is a first line segment, and the projection of the midpoint of the side line of the rectangle on the light splitting surface overlaps with the relative extreme point of the first line segment.

2. The optical structure film according to claim 1, wherein, Each of the plurality of optical unit microstructures further includes a plurality of light splitting inclined surfaces. The plurality of light splitting inclined surfaces intersect at the relative extreme point of the light splitting surface, and the projection of the intersection point of the diagonal line of the rectangle on the light splitting surface overlaps with the relative extreme point of the light splitting surface.

3. The optical structure film according to claim 2, wherein On the cross-section with the diagonal line of the rectangle as the cutting line, the curve of the light splitting curved surface is a sine curve. The four endpoints of the light splitting surface are located at the relative extreme points of the sine curve, and the projection of the perpendicular bisector of the side line of the rectangle on the light splitting surface overlaps with the intersection line of two adjacent light splitting inclined surfaces among the plurality of light splitting inclined surfaces.

4. The optical structure film according to claim 3, characterized in that, The plurality of light splitting inclined surfaces include four triangular inclined surfaces. A pyramid that is recessed inward is formed on the light splitting surface. The vertex of the pyramid is the relative extreme point of the light splitting surface, and the midpoint of the bottom edge of the pyramid is located on the diagonal line of the rectangle and is the intersection point with the sine curve.

5. The optical structure film according to claim 4, wherein On the cross-section with the diagonal line of the rectangle as the cutting line, the contour of the pyramid has a first included angle, and the range of the first included angle is between 45 degrees and 135 degrees.

6. The optical structure film according to claim 4, wherein The relative extreme point of the first line segment is the other vertex of each of the triangular inclined surfaces.

7. The optical structure film according to claim 4, wherein Each of the plurality of light splitting inclined surfaces has a plurality of sub-inclined surfaces. The projection of the intersection line of the diagonal line of the rectangle and two adjacent sub-inclined surfaces in each of the plurality of light splitting inclined surfaces on the light splitting surface overlaps.

8. The optical structure film according to claim 2, wherein, Each of the plurality of light splitting inclined surfaces includes two sub-inclined surfaces. The two adjacent sub-inclined surfaces in each of the plurality of light splitting inclined surfaces respectively form a V-shaped groove structure. The relative extreme point of each of the V-shaped groove structures is located at the relative extreme point of the light splitting surface, and the at least one light splitting curved surface is divided into a plurality of sub-light splitting curved surfaces by each of the V-shaped groove structures.

9. The optical structure film according to claim 8, wherein, The projection of the intersection line of the diagonal line of the rectangle and the two adjacent sub-inclined surfaces in each of the plurality of light splitting inclined surfaces on the light splitting surface overlaps. The relative extreme point of the light splitting surface is the intersection point of each of the V-shaped groove structures and the sub-light splitting curved surfaces. The four endpoints of the light splitting surface are respectively one of the vertices of each of the V-shaped groove structures.

10. The optical structure film according to claim 8, wherein The projection of the perpendicular bisector of the side line of the rectangle on the light splitting surface overlaps with the intersection line of the two adjacent sub-inclined surfaces in each of the plurality of light splitting inclined surfaces, and the relative extreme point of the first line segment is one of the vertices of the V-shaped groove structure.

11. The optical structure film according to claim 8, wherein There is a second included angle between the two sub-inclined surfaces, and the range of the second included angle is between 45 degrees and 135 degrees.

12. The optical structure film according to claim 1, wherein The optical structure film further includes a substrate having a first surface and a second surface facing away from each other, and the plurality of optical unit microstructures are formed on the first surface.

13. The optical structure film according to claim 12, characterized in that, The second surface is formed with a plurality of prism microstructures.

14. The optical structure film according to claim 13, wherein, The plurality of prism microstructures are arranged in an array to form multiple columns, and the plurality of prism microstructures in adjacent columns are offset from each other.

15. The optical structure film according to claim 14, wherein each of the plurality of prism microstructures has a plurality of inclined planes at a first end and a second end in an extending direction, and when the first end of the plurality of prism microstructures in one column abuts against the second end of the plurality of prism microstructures in another column, the plurality of inclined planes at the first end of the plurality of prism microstructures in the one column in the extending direction are connected to the plurality of inclined planes at the second end of the plurality of prism microstructures in the another column in the extending direction.

16. A light source module, characterized in that, The light source module includes a plurality of light-emitting elements and an optical structure film, wherein: The plurality of light-emitting elements are configured to provide light beams; The optical structure film is located on the transmission path of the light beams. The optical structure film includes a substrate and a plurality of optical unit microstructures, wherein: The substrate has a first surface and a second surface facing away from each other, and the first surface faces the plurality of light-emitting elements; Each of the plurality of optical unit microstructures has four side surfaces and a light-splitting surface recessed inward. The light-splitting surface is respectively connected to the side surfaces and has four end points when viewed from a front view perspective. The connection lines of the four end points form a rectangle, and the light-splitting surface includes at least one light-splitting curved surface. The intersection of the at least one light-splitting curved surface and one of the four side surfaces is a first line segment, and the projection of the midpoint of the side line of the rectangle on the light-splitting surface overlaps with the relative extreme point of the first line segment.

17. The light source module according to claim 16, wherein, The light source module further includes a diffusion film. The second surface of the substrate faces the diffusion film, and the light source module further includes a plurality of grid structures. Each of the plurality of grid structures has a plurality of reflecting surfaces. The plurality of light-emitting elements are respectively located in each of the plurality of grid structures and are respectively surrounded by the plurality of reflecting surfaces of each of the plurality of grid structures.

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