TWI351534B - Optical plate and backlight module using the same - Google Patents

Description

1351534 1: L00年〇"July 21曰修i replacement page VI, invention description: - [Technical field of invention] [0001] The present invention relates to a backlight module and an optical plate thereof, and more particularly to a liquid crystal Display backlight module and optical plate β [Prior Art 3 [0002] Since the liquid crystal of the liquid crystal display panel itself has no light-emitting characteristics, it is necessary to provide a light source device for the liquid crystal display panel in order to achieve the display effect.

Such as backlight module. The function of the backlight module is to supply a surface light source with sufficient brightness and uniform distribution to the liquid crystal display panel. I

Referring to FIG. 1, a conventional backlight module 10 () includes a frame 101, a reflector 102, a diffusion plate 103, a die 104, and at least one light-emitting body 105. The frame 101 includes a bottom plate 11 and a plurality of side walls 1013 extending perpendicularly from the edge of the bottom plate loii to the same side thereof. The bottom plate 1〇11 and the plurality of side walls 1013 together form a cavity 1〇17. The light-emitting diode 1〇5 includes a light-emitting portion 1051 and a base portion 1053, and the base portion 1053 is connected to a circuit board (not shown) and fixed to the bottom plate 1011. The diffusion plate 103 and the prism sheet 1〇4 are sequentially disposed on the top of the plurality of side walls 1013. The reflecting plate 102 is a small frame structure which can be disposed inside the frame 101. A through hole (not shown) corresponding to the light emitting body 105 is formed at the bottom of the reflecting plate 102, and the light emitting portion 1051 of the light emitting diode passes through the corresponding through hole. The base 1 〇 53 of the light-emitting diode 1 顶 5 holds the reflector 102 » [0004] When working, the light generated by the light-emitting diode 1 〇 5 is reflected by the reflector 1 〇 2 into the diffusion plate 103 'on the diffusion plate After being uniformly diffused in 1〇3, the light continues to enter the cymbal 104. Under the action of the cymbal 1〇4, the emitted light is concentrated to a certain extent, so that the brightness of the backlight module in a certain viewing angle range is 096117734. Form No. 1010101 No. 4 Page / Total 21 pages 1003265592-0 ^M534 Improve. On July 21, 100, according to the replacement page, because the light-emitting diode 105 is a point light source, the distances reaching the diffusion plate 1〇3 are not equal, and the expansion plate is located directly above the light-emitting diode ι〇5. The 103 unit area receives a large amount of light, and the unit area of the diffusing plate 103 located around the light-emitting pole tube 1G5 receives less light, so that it is easy to form a bright area in the area directly above the light-emitting diode 105, and the surrounding area above it The dark area is formed to affect the light uniformity of the backlight module 100. In addition, in order to achieve better optical uniformity, a large light mixing space is usually required between the reflecting plate 1〇2 and the diffusing plate 103 in the backlight module 100. Therefore, the backlight module 100 has a large thickness. D〇〇6] Usually, a reflection sheet 1〇6 is provided above the light-emitting diode 1〇5 to control the amount of light emitted directly above the light-emitting diode 105. The combination of the light-emitting diode 105 and the reflective sheet 106 can weaken the bright area directly above the light-emitting diode 105 to a certain extent. However, the backlight module 100 still has a defect of uneven light distribution.

[961] [0007] In view of the above circumstances, it is necessary to provide a backlight module with uniform light emission and an optical plate thereof. An optical plate comprising at least one optical plate unit, the optical plate unit including a first surface and a second surface opposite the first surface. The first surface is formed with a plurality of microprotrusions. Each microprojection includes at least three interconnected sides, each of which tapers in a direction parallel to the first surface in a direction parallel to the width of the first surface. The second surface forms a plurality of spherical grooves, and the plurality of spherical grooves are symmetrically distributed along the circular orbit along the center of the optical plate. The farther away from the center of the optical plate, the spherical form number A0101 is page 5 / A total of 21 pages 1003265592-0 1351534 100 years of July 21, the diameter of the groove is larger. At least one surface of the first surface and the second surface is provided with a light source receiving portion. [0009] A backlight module includes a frame, a diffusion plate, an optical plate, and at least one side point light source; the frame includes a bottom plate and a plurality of interconnecting sidewalls extending from an edge of the bottom plate, the plurality of sidewalls forming a sidewall One cavity

The at least one side light source having the light exiting portion is disposed on the surface of the bottom plate; the diffusing plate covers the cavity; the optical plate is disposed in the cavity, and the optical plate includes at least one optical plate unit The optical plate unit includes a first surface and a second surface opposite to the first surface, the first surface is formed with a plurality of micro-protrusions, each micro-protrusion comprising at least three interconnected sides, each side being parallel to The width of the first surface gradually decreases away from the first surface; the second surface forms a plurality of spherical grooves, the plurality of spherical grooves being centered on the center of the optical plate and symmetrically distributed along the circular orbit. The distance from the center of the optical plate is larger, and the diameter of the spherical surface is larger; at least one surface of the first surface and the second surface is provided with a light source receiving portion; the light emitting portion of the side light point light source is correspondingly disposed in the light source receiving portion . [0010] The optical plate unit of the optical plate of the backlight module includes a light source receiving portion, a plurality of micro-protrusions formed on the first surface, and a plurality of spherical grooves formed on the second surface, and the light-emitting portion of the side-light point light source is accommodated In the light source housing portion, the light emitted from the side-light point source directly enters the inside of the optical plate through the inner side wall of the light source housing. Since the micro-protrusions have a varying surface structure, when light is transmitted to the micro-protrusions in the optical plate, part of the light that was originally totally reflected in the optical plate not provided with the micro-protrusions can be adjusted by the micro-protrusions to face the diffusion plate. The direction is refracted to increase the outgoing light. Further 096117734 Form No. A0101 Page 6 / Total 21 Page 1003265592-0 1351534 _ July 21st, 2011, the replacement page, 'Because the second side of the optical plate is provided with a spherical groove, some of the original is not provided with a spherical concave The light totally reflected in the optical plate of the groove can be adjusted by the light from the second surface, and after being reflected, the portion of the light is refracted multiple times and then uniformly emitted toward the diffusion plate. Therefore, the optical uniformity and optical utilization of the backlight module will be further improved. Further, since the light emitted by the edge-light point source of the side-light point source is mostly propagated in the periphery of the optical plate, the point source is converted into a surface source by the action of the optical plate. Therefore, the backlight module using the optical plate does not need to have a large mixed light space, and the backlight module has a small thickness. [Embodiment] Hereinafter, a backlight module and an optical plate thereof according to the present invention will be further described in detail with reference to the accompanying drawings and embodiments. 2 is a backlight module 200 according to a preferred embodiment of the present invention, which includes a frame 21, a reflector 22, a diffuser panel 23, a side light point source 25', and a Optical plate 20. The frame 21 includes a rectangular bottom plate 211 and four side walls 213 extending perpendicularly from the edge of the bottom plate 211 toward the same side thereof and connected to each other. The four side walls 213 and the bottom plate 211 together form a cavity 217. The diffuser plate 23 is disposed on the top of the plurality of side walls 213 for covering the cavity 217. The cavity 217 is for accommodating components such as the optical plate 20, the reflecting plate 22, and the side-light point source 25. The optical plate 20 is disposed in the cavity 217, and its light-emitting surface 2〇2 faces the diffusion plate 23. A reflector 22 is disposed below the bottom surface 203 of the optical plate 20. The reflector 22 defines a through hole (not shown) corresponding to the edge light source 25, and the light exit portion 251 of the edge light source 25 passes through the through hole (not shown) » the edge light source 25 is fixed to the bottom plate. 211. The side-light point light source 25 is preferably an edge-light type light-emitting diode, and the light-emitting portion 251 is housed in the light source housing portion 204 of the optical plate 2 096117734, Form No. A0101, page 7 of 21, 1003265592-0 1351534. In this embodiment, the edge-light point source 25 further includes a reflective element 253 disposed at the top, and the reflective element 253 can reflect a portion of the light emitted from the top of the light-emitting portion 251 of the edge-light point source 25 into the optical plate 20. . The light emitted from the edge-light point source 25 is sufficiently mixed in the cavity 217 to be emitted through the diffusion plate 23. [0013] Referring to FIG. 3 to FIG. 5 simultaneously, the optical plate 20 is a rectangular transparent plate, and the bottom surface 203 is provided with a light source receiving portion 204 at the center. The light source housing portion 204 is a through hole penetrating from the bottom surface 203 to the light exit surface 202. The light-emitting surface 202 is formed with a plurality of micro-protrusions 205 located around the light source housing portion 204. The bottom surface 203 is formed with a plurality of spherical grooves 206 located around the light source housing portion 204. [0014] In the embodiment, the plurality of micro protrusions 205 are arranged in a regular array, and each of the micro protrusions 205 is a regular four-sided pyramid protrusion, and the preferred range of the angle θ 1 between the two opposite sides is It is (10) to 〇2 degrees. As shown in Fig. 3, the plurality of microprotrusions 205 are arranged to extend in a direction parallel or perpendicular to the X-axis direction or the γ-axis, and the distance between adjacent micro-protrusions 205 is preferably 0.025 mm to 2 mm. In addition, the plurality of micro-protrusions 205 can also be arranged along any angle between the X-axis and the γ-axis, and the arrangement can further control the exit angle of the outgoing light. It will be appreciated that the shape of the microprojections 205 is not limited to regular tetrahedral projections, but may be convex for other multifaceted conical projections or frustums. [0251] As shown in FIG. 5, in the present embodiment, the plurality of spherical grooves 206 are in a rectangular array. Each groove 206 is a hemispherical groove, and the distance between adjacent spherical grooves 206 is also preferably 〇. 025 mm. Up to 2 mm. The preferred value of the semi-duty and depth of each spherical groove 206 is 〇〇1 mm to 2 mm. [0016] The eye is further referred to as the circle 2' in the backlight module 2 of the first embodiment, the side light Form point 096117734 Form number Α0101 Page 8 of 21 page 1003265592-0 1351534 >

[0017] On July 21, 100, the light emitted from the light exit portion 251 of the shuttle replacing the light source 25 directly enters the inside of the optical plate 20 through the inner side wall of the light source accommodating portion 204. Since the micro protrusion 205 has a varying surface structure, the light is made When transmitted to the protrusions 205 in the optical plate 20, a portion of the light which is originally totally reflected and propagated in the optical plate 20 not provided with the micro protrusions 205 can be adjusted by the micro protrusions 205 and then refracted in a specific direction, for example, a portion The light is adjusted to be emitted in a direction perpendicular to the direction of the diffuser plate 23 to increase the light emitted from the front side to avoid creating a dark region between the adjacent side light source sources 25 to improve the uniformity of the backlight module 2 Sex. Further, since the bottom surface of the optical plate 20 is provided with a spherical groove 206', the light which is originally totally reflected in the optical plate 20 not provided with the spherical groove 206 can be adjusted by the light from the bottom surface 203, in the frame 1〇 Under the auxiliary action of 1, the portion of the light is refracted multiple times and then emitted toward the diffusion plate 23. Therefore, the optical utilization rate of the backlight module 200 will be further improved. Further, since the side-light point source 25 is used, most of the light emitted from the side-light point source 25 propagates around the optical panel 20, so that the point source is converted into a surface source. The area directly above the side-light point source 25 will avoid bright spots, and this design makes it possible to reduce the distance between the diffusion plate 23 and the optical plate 2, thereby reducing the thickness of the backlight module 2〇〇. It can be understood that, in order to make the backlight module 2 have a certain degree of membership within a specific viewing angle range, a prism sheet 24 may be disposed above the diffusion plate 23: in order to uniformly mix the light beam in the cavity and To improve light utilization, the reflector 22 can further include a plurality of reflective sidewalls 223 attached to the sidewall 213 of the frame 21. Further, the reflecting plate 22 of the present embodiment can be omitted, especially when the frame 21 is made of a highly reflective material or a reflective coating is applied to the bottom surface. 096117734 Form No. A0101 Page 9 of 21 1003265592-0 [0018] 1351534 July 1100: -曰 Revision Page Referring to Figure 6, there is shown an optical plate 30 of a preferred embodiment of the present invention. The optical plate 30 is similar to the optical plate 20 of the preferred embodiment 1 except that the light source housing portion 3〇4 of the optical plate 30 is a blind hole that is recessed from the bottom surface 303 toward the inside of the optical plate 30. Referring to FIG. 7, there is shown an optical plate 40 of the preferred embodiment of the present invention. The optical plate 40 is similar to the optical plate 3 of the second embodiment. The difference is that the optical plate 40 is slightly convex. The apex angle from 40 5 and the bottom angle formed by the adjacent micro-protrusions 405 are rounded to form rounded corners R1 and R2, respectively. The radius of R1 and R2 is preferably greater than 〇 and less than or equal to 1.1 mm. The rounded micro-protrusions 405 can make the change of the exit angle of the outgoing beam tend to be moderated. The uniformity of the light output of the backlight module is improved. [0021] Referring to FIG. 8, there is shown a four-component optical plate 5A according to a preferred embodiment of the present invention. The combined optical plate 50 includes a plurality of optical plate units 52. The optical plate unit 52 has the same structure as the optical plate 20 of the preferred embodiment 1. The plurality of optical plate units 52 are closely arranged to each other to form a larger combined optical plate 5''. [0022] It can be understood that the shape of the above-mentioned optical plate unit of the present invention may be a polygonal or circular arrangement of the micro-grooves on the optical plate single one.

Array arrangement, array spacing arrangement, central symmetric distribution of cells, etc., wherein uniformly distributed in all directions or symmetrically arranged relative to the optical plate facilitates light [0023] The spherical recess of the optical plate unit of the present invention described above The groove can also adjust the size and density of the light source to adjust the light source uniformity of the light exit surface of the optical plate. For a plurality of spherical grooves of the same size, it can be set to wait for '* 'arrangement in degrees; for a plurality of spherical grooves of different sizes, among the optical plate units, soft 096117734 Form No. A0101 Page 10 of 21 Page 1003265592-0 1351534 . · On July 21, 100, the nuclear replacement page can set a smaller and denser spherical groove, and the larger and lower density can be set farther from the center of the optical plate unit. Spherical groove. Referring to FIG. 9, there is shown an optical plate 60 according to a fifth embodiment of the present invention, which is similar to the second embodiment except that the plurality of spherical grooves 606 on the bottom surface 603 of the optical plate 60 are optical plates 60. The center of the circle is symmetrically distributed along the circular orbital track, and the further away from the center of the optical plate 60, the larger the diameter of the spherical groove 606. [0025] In addition, the micro-protrusion and the spherical groove of the optical plate of the present invention are interchangeably disposed on the φ light surface or the bottom surface, that is, in the backlight module, the light source accommodating portion is the light-emitting surface and the bottom surface of the optical plate of the through-hole. Can be set towards the diffuser. In summary, it is assumed that one of the light-emitting surface or the bottom surface of the optical plate of the present invention is defined as a first surface, and the opposite bottom surface or the light-emitting surface is defined as a second surface, then the first surface is formed with a plurality of micro-protrusions The second surface is formed with a plurality of spherical grooves. In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and those skilled in the art will be equivalently modified or changed in accordance with the spirit of the invention. , should be included in the scope of the following patent application. BRIEF DESCRIPTION OF THE DRAWINGS [0027] FIG. 1 is a cross-sectional view of a conventional backlight module. 2 is a cross-sectional view of a backlight module in accordance with a preferred embodiment of the present invention. 3 is a perspective view of an optical plate of the backlight module shown in FIG. 2. 4 is a cross-sectional view of the optical plate shown in FIG. 3 taken along line IV-IV. [0030] FIG. 096117734 Form No. A0101 Page 11 of 21 1003265592-0 1351534 July 2nd, 2nd, 2nd, replacement page [0031] Figure 5 is a perspective view of another view of the optical plate shown in Figure 3. [0032] FIG. 6 is a cross-sectional view of a second embodiment of the optical sheet of the preferred embodiment of the present invention. 7 is a cross-sectional view of a third optical plate in accordance with a preferred embodiment of the present invention. 8 is a perspective exploded view of a four-group optical plate in accordance with a preferred embodiment of the present invention. [0035] 圃9 is a bottom view of a fifth optical plate in accordance with a preferred embodiment of the present invention. [Main component symbol description] [0036] (Invention) [0037] Backlight module: 200 [0038] Optical plate: 20 [0039] Frame: 21 [0040] Light-emitting surface: 202 [0041] Base plate: 211 [0042] Bottom surface: 203 [0043] Side wall: 213 [0044] Micro-bump: 205 [0045] Reflector: 22 [0046] Spherical groove: 20 6 [0047] Diffuser: 23 [0048] Light source housing: 204 [0049 Sidelight point source: 25 Form number A0101

096117734 Page 12 of 21 1003265592-0 1351534 , * Corrected replacement page on July 21, 100. [0050] Cavity: 217 ' [0051] Light exit: 251 [0052] Sepal: 24 [0053] Reflection Component: 253 [0054] Reflecting sidewall: 223 [0055] (Practical) [0057] [0057] Backlight module: 100 diffuser: 103 [0058] Frame: 101 [0059] Sepal: 104 [0060] Base plate: 1011 [0061] Light-emitting diode: 105 [0062] • [0063] Side wall: 1 013 Light exit: 1051 [0064] Cavity: 1017 [0065] Base: 1053 [0066] Reflector: 102 [0067 Reflective sheet: 106 096117734 Form number A0101 Page 13 of 21 page 1003265592-0

Claims (1)

1351534 07 替换 替换 替换 七 七 七 七 七 七 七 七 七 七 七 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 、 The second surface is modified in that: the first surface is formed with a plurality of micro-protrusions, each micro-protrusion includes at least three interconnected sides, and each side is parallel to the width of the first surface and away from the first surface The direction is gradually reduced; the second surface forms a plurality of spherical grooves, the plurality of spherical grooves are centered on the center of the optical plate, symmetrically distributed along the circular orbit, and the farther away from the center of the optical plate, the spherical groove The diameter of the first surface and the second surface is at least one surface φ provided with a light source receiving portion. 2. The optical sheet of claim 1, wherein the micro-protrusions are hetero-shaped protrusions or miscellaneous protrusions. 3. The optical sheet of claim 2, wherein the angle between the opposite sides of each of the tapered projections is 60 to 120 degrees. 025毫米至2毫米。 The optical plate of the second aspect of the invention, wherein the distance between the adjacent micro-protrusions is 0. 025 mm to 2 mm. 5. The optical plate of claim 1, wherein the plurality of micro-convex φ are arranged in an array, arranged in an array, or arranged symmetrically centered on the light source receiving portion. 01毫米至2毫米。 The optical plate of the first embodiment, wherein the radius of the spherical groove is 0.01 mm to 2 mm. 01毫米至2毫米。 The optical plate according to the invention of claim 1, wherein the spherical groove has a depth of 0.01 mm to 2 mm. 8. The optical sheet of claim 1, wherein the distance between adjacent spherical grooves is 0.025 mm to 2 mm. 096117734 Form No. A0101 Page 14 of 21 1003265592-0 1351534. The optical plate of claim 1 is the same as the optical plate of claim 1, wherein the plurality of spherical grooves are The array arrangement, the arrays are arranged at intervals or are arranged symmetrically centered on the light source housing. 10. The optical sheet of claim 1, wherein the light source receiving portion is one of a through hole and a blind hole. 11. The optical sheet of claim 1, wherein the optical sheet comprises a plurality of optical sheet units, the plurality of optical sheet units being closely arranged. 12. The optical sheet of claim 1, wherein the optical sheet is rounded at at least one of an apex angle and a bottom corner of the microprotrusion. The optical plate of the rounded corner having a radius of more than 0 mm and less than or equal to 1.1 mm. 14. A backlight module comprising a frame, a diffuser, and at least one side light spot a source and an optical plate; the frame includes a bottom plate and a plurality of interconnecting sidewalls extending from an edge of the bottom plate, the plurality of sidewalls forming a cavity with the bottom plate; the at least one optical point source is fixed to the bottom plate; the diffusion plate Covering the cavity; the optical plate is disposed in the cavity, the optical plate includes at least one optical plate unit, the optical plate unit includes a first surface and a second surface opposite to the first surface, and the improvement is: The first surface is formed with a plurality of micro-protrusions, each micro-protrusion includes at least three mutually connected sides, and a width of each side parallel to the first surface is gradually reduced in a direction away from the first surface; Forming a plurality of spherical grooves on the two surfaces, the plurality of spherical grooves being centered on the center of the optical plate, symmetrically distributed along the circular orbit, and the farther away from the center of the optical plate, the larger the diameter of the spherical groove; At least one of the first surface and the second surface is provided with a light source receiving portion; the light emitting portion of the side light point light source is correspondingly disposed in the light source receiving portion. 096117734 15 The backlight module of claim 14, wherein the backlight module form number A0101 page 15 / 21 pages 1003265592-0 1351534 ' |~100 years of July 21, the replacement page also includes a reflecting plate is provided with at least one through hole, and the reflecting plate is disposed under the optical plate, and the side light point light source passes through the through hole correspondingly. The backlight module of claim 14, wherein the edge light source is a light emitting diode comprising a light exiting portion and a reflective element disposed at a top end of the light exiting portion. The backlight module of claim 14, wherein the frame is made of a highly reflective material. 18. The backlight module of claim 14, wherein the backlight module further comprises a highly reflective coating applied to the substrate. The backlight module of claim 14, wherein the light source receiving portion is one of a through hole and a blind hole. The backlight module of claim U, wherein the optical plate is rounded at at least one of an apex angle and a bottom corner of the microprotrusion. 096117734 Form No. A0101 Page 16 of 21 1003265592-0