TWI343489B - Optical plate and backlight module using the same - Google Patents

Description

1343489

— " I

The loo year 〇 March 2e is the following page I. Description of the invention: [Technical field of the invention] [〇〇〇1] The present invention relates to a backlight module and an optical plate thereof, and more particularly to a liquid crystal display Backlight module and its optical board. [Prior Art] [0002] Since the liquid crystal of the liquid crystal display panel itself does not have the characteristics of the prior art, it is necessary to provide a light source and a source for the liquid crystal display panel in order to achieve the display effect, such as a backlight module. The function of the backlight module is to supply the liquid crystal display panel - a surface light source with sufficient brightness and uniform distribution. Referring to FIG. 1, a conventional backlight module 1A includes a frame 101, a reflector 102, a diffusion plate lt)3, a cymbal 〇4, and at least one light-emitting diode 105. The frame 101 includes a bottom plate 1011 and a plurality of side walls 1013 extending perpendicularly from the edge of the bottom plate 1011 toward the same side. The bottom plate 1〇11 and the plurality of side walls 1013 together form a cavity 1017. The light-emitting diode 1〇5 includes a light-emitting portion 1051 and Base 1053: 'Tai's. 1053 is connected to a circuit board (not shown) and fixed to the bottom plate 1011. The diffusion plate 103 and the cymbal plate 〇4 are sequentially disposed on the top of the plurality of side walls 1013. The reflection _10.2 is a small frame structure which can be disposed inside the frame 101. A through hole (not shown) corresponding to the light emitting diode 105 is opened at the bottom of the reflecting plate 102, and the light emitting portion 1051 of the light emitting diode 1〇5 passes through the corresponding through hole. The base plate 1 〇 53 of the light-emitting diode 顶 5 holds the reflector 102. [0004] During operation, the light generated by the light-emitting diode 105 is reflected by the reflecting plate 1〇2 into the diffusing plate 103, and is uniformly diffused in the diffusing plate 103, and then the light continues to enter the die 104, under the action of the prism sheet 104. The emitted light is concentrated to a certain extent, so that the backlight module has a brightness within a certain viewing angle range 096129538. No. A0101 Page 3 / Total 20 pages 1003106952-0 «43489

On March 28, 100, the shuttle was replacing W to improve. [0005] However, since the light-emitting diodes 105 are point light sources, the distances reaching the diffusing plates 103 are not equal, and the unit area of the diffusing plate 103 located directly above the light-emitting diodes 105 receives more light. The unit of the diffusing plate 103 around the light-emitting diode 105 receives less light, so that a bright region is formed in a region directly above the light-emitting diode 105, and a dark region is formed in a peripheral region above the light-emitting diode 105, thereby affecting the backlight module 100. Light uniformity. For this reason, it is usually necessary to provide a reflection sheet 106 above the light-emitting diode 105 to control the light-emitting genus directly above the light-emitting diode 105. Turn r wash two. The combination of the body 105 and the reflection sheet 106, the body 105 is directly above the bright area, the disadvantages of the backlight module

SUMMARY OF THE INVENTION In view of the above circumstances, it is necessary to provide a light-emitting backlight module and an optical plate thereof. [0007] An optical plate comprising: at least one optical plate unit comprising a light-emitting surface, and a scattering layer formed on the light-emitting surface, the bottom surface is provided with a V-shaped protrusion, and the bottom surface is provided with at least one Light source housing. The scattering layer is one of the following three distributions: a plurality of rectangular closed-type scattering layers are spaced apart from each other around the light source receiving portion, and the farther away from the light source receiving portion, the larger the width of the rectangular closed scattering layer is: the light source housing portion For the center of the circle, the plurality of dot-like scattering layers are distributed along the circular path, and the farther away from the light source receiving portion, the larger the area of the dot-like scattering layer is; the light source receiving portion is centered, and the plurality of dots of the same size are The scattering layers are spaced along the circular orbital track, and the further away from the light source receiving portion, the greater the distribution density of the dot-like scattering layer 096129538 Form No. A0101 Page 4 / Total 20 Pages 1003106952-0 1343489 [0008] [0009] 096129538 On March 28th, 100th, the replacement page is: a back-front module, which includes a frame, at least a point source and an optical plate; the miscellaneous frame includes a bottom plate and a plurality of interconnecting side walls extending from the edge of the bottom plate, a bottom plate „—(4); a point source having a light-emitting portion and a light-emitting portion is disposed on the bottom plate; the optical plate is disposed in the cavity. The optical plate includes at least an optical plate unit, the optical The unit includes a light-emitting surface and a surface of the surface of the surface of the surface of the surface (1) having a plurality of strip-shaped V-shaped protrusions, and the bottom surface is provided with at least a dicing receiving portion, and the learning board further comprises a scattering layer formed on the light-emitting surface; The exiting portion of the point source is correspondingly disposed in the light source receiving portion. The scattering layer is one of the following three kinds of distribution: centering on the light source receiving portion: a plurality of rectangular seals: the interval of the shot layers is spaced apart, and the farther away from the light source receiving portion, the rectangle The larger the width of the scattering layer is; the center of the light source receiving portion is centered, the scattering layer of the complex _= is distributed along the ring, and the area of the scattering layer is larger as the light source portion is larger; For ^, a plurality of mesh-like scattering layers of the same size are distributed along the circular orbital track 2 and are farther away from the light source receiving portion, and the dots are scattered. The greater the degree, the optical plate of the optical plate of the above backlight module The unit includes a light source (4), a plurality of strip-shaped V-shaped protrusions formed on the bottom surface, and a light-emitting surface layer formed on the light-emitting surface, and the light-emitting portion of the point light source is housed in the light source receiving portion. The light emitted from the point is lighted by the original light. Light source housing The inner side wall directly enters the optical plate', and the long v-shaped protrusion provided on the bottom surface of the optical plate has a variable surface structure, so that the light is transmitted to the long V-shaped convex portion in the optical plate, and the long V-shaped convex shape is obtained. From the form number A0101 which is not provided with the long strip-shaped v-shaped protrusions, page 5/total 20 pages, 1〇〇31〇6952-〇1343489 ———100^〇, on March 28, the shuttle is being replaced. The light transmitted by the total reflection in the optical plate is adjusted and then emitted from the bottom surface. Under the reflection of the frame, the portion of the light is refracted multiple times and enters the scattering layer, and is evenly diffused through the scattering layer and uniformly emitted from the opening of the beer, so the backlight module The optical utilization ratio and the uniformity of light emission of the group are improved. Further, the light emitted by the point source is mostly transmitted to the periphery of the optical plate, and the light source is converted into a surface light source, thereby enabling the backlight module using the optical plate. The bright point is not generated in the area above the point source because the distance from the point source to the diffusing plate is too small. Therefore, the backlight module can reduce the height of the light box. In addition, the backing mode with the scattering shoulder is used as the learning board. Group can save [0010] The use of a slightly diffused plate is low 0 遽焉 less thickness drop

[Embodiment] Hereinafter, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. Referring to FIG. 2, a backlight module 200 of the present invention includes a frame 21, a reflective light source 25, and an optical plate 20. The frame 2 bundle includes: 211 and four side walls 213 extending perpendicularly from the edge of the bottom plate 211 to the same side thereof and connected to each other. The four side walls 213 and the bottom plate 211 together form a cavity 217 for accommodating components such as the point source 25, the reflector 22, and the optical plate 20. Referring to FIG. 3, the optical plate 20 is a rectangular plate' which includes a light exiting surface 202' and a bottom surface 203 opposite to the light exiting surface 202. A light source accommodating portion 204 is formed in the center of the bottom surface 203, and the light source accommodating portion 204 is a through hole penetrating from the bottom surface 203 to the light emitting surface 202. The light exiting surface 202 forms a scattering layer 205 of uniform thickness, and the bottom surface 203 forms a plurality of elongated V-shaped projections 206. 096129538 No. 101 0101 Page 6 / Total 20 pages 1003106952-0 1343489 __ March 28, 1999 Nuclear replacement page [0013] The scattering layer 205 includes a transparent resin 2052 and scattering particles uniformly doped in the transparent resin 2 052 2054. The transparent resin 2052 is preferably an acrylic resin or an epoxy resin. The scattering particles 2054 are incorporated into a transparent resin 2052 which may be selected from one or more of the following particles: cerium oxide particles, polymethyl methacrylate particles, glass beads, and the like. [0014] In this embodiment, the plurality of elongated V-shaped protrusions 206 extend in the X-axis direction, and the adjacent elongated V-shaped protrusions 206 are closely connected. Referring to Fig. 4, the apex angle 0 of each elongated V-shaped projection 206 preferably ranges from 60 to 120 degrees. 025毫米至2毫米。 The distance between the adjacent strip-shaped V-shaped protrusions 206 is preferably from 0.025 mm to 2 mm. [0015] It can be understood that the extending direction of the elongated V-shaped protrusions 206 can also be in the Y-axis direction or form an acute angle with the side edges of the optical plate 20, and this design can further control the exit angle of the outgoing light. Referring to FIG. 2 again, the point source 25 is preferably an edge-lit LED, which includes a base 253, a light-emitting portion 251 fixed to the base 253, and a reflective sheet 255. The point source 25 is fixed to the bottom plate 211 by a circuit board (not shown). The optical plate 20 is disposed in the cavity 217 with its light exiting surface 202 facing the opening of the cavity 217. The light exit portion 251 of the point light source 25 is housed in the light source housing portion 204 of the optical plate 20. The reflection sheet 255 is disposed at a position directly above the corresponding point source 25 for covering the top of the point source 25. The area of the reflection sheet 255 is equal to or slightly larger than the projected area of the light exit portion 251. The reflecting plate 22 defines a through hole (not shown) corresponding to the light exit portion 251 of the point source 25. The reflecting plate 22 is disposed below the bottom surface 203 of the optical plate 20, and the light exiting portion 251 of the point light source 25 passes through the through hole. 096129538 Form No. A0101 Page 7 / Total 20 Page 1003106952-0 1343489 [0017] 100 years of March JLUU ten U3 is 'C point light source 25 light emitted from the light exit portion 251 directly enters the inner side wall of the light source receiving portion 204' The inner surface of the optical plate 2 is disposed on the bottom surface 2〇3 of the optical plate 2Q. The strip-shaped V-shaped & 206-long strip-shaped v-shaped projection 2Q6 can be used as the original portion without the elongated strip (four) projection 2 The light of the (6) optical plate 2 is totally reflected and propagated from the bottom surface 2〇3, and under the auxiliary action of the reflecting plate 22, the light is repeatedly refracted into the scattering layer m and passes through the scattering layer 2〇. 5 evenly diffused from the cavity opening, so the optical utilization of the backlight module and the uniformity of light emission can be improved H step, because the edge light source 25' point source light is mostly optical (four) (four), thus The backlight module of the optical green wheat backlight module is not too small, and the backlight module above the source is reduced to reduce the height of the light box.

The backlight module of the optical plate having the scattering layer 205 can omit the diffusion plate 1 〇 3 ^, thereby reducing the cost and thickness of the backlight module. The backlight module 200 can also be used to raise the uniform brightness of the backlight module 200 in the special state. In order to uniformly mix the light beam in the cavity and increase the & line utilization, the reflective plate 22 may further include a plurality of reflective sidewalls 223. It can be understood that 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 highly reflective coating is applied to the inside of the bottom plate 211 and the side wall 213. [0019] Referring to Figure 5, there is shown an optical plate 3 of a preferred embodiment of the present invention. The optical plate 30 is similar to the optical plate 2A of the first embodiment except that the apex angle of the elongated V-shaped projections 3〇6 of the optical plate 30 and the adjacent elongated v-shaped projections 306 are formed. The bottom corners are rounded, forming rounded corners with 096129538 Form No. A0101 Page 8 of 2 Pages 1003106952-0 100 March 28 Pressing the replacement page R2. The range of the rounded corners of 1 and 2 is preferably greater than 0 and less than or equal to 0.1 mm. The strip-shaped v-shaped projections 306 which are rounded off tend to alleviate the change in the exit angle of the outgoing beam, and the light-emitting pattern of the optical plate 3 is improved. It can be understood that the above-described rounded design can also be separately performed on one of the apex angles of the elongated v-shaped projections 306 and the bottom corners formed by the adjacent elongated projections 3〇6. [0020] Referring to FIG. 6, a solar panel 4 is shown in the third embodiment of the present invention. The light-drying plate 40 is similar to the optical plate 20 of the first embodiment except that the light source receiving portion 404 of the light-emitting plate 40 is a blind hole formed in the bottom surface 403. The backlight module using the optical plate 40 can be combined with an edge-light point source without a reflective element or directly coated with a highly reflective layer at the bottom of the blind hole. [0021] Referring to FIG. 7, there is shown an optical plate 5 of a preferred embodiment of the present invention. The optical plate 50 is similar to the optical plate 20 of the preferred embodiment 1 except that the emissive layer 5〇5 of the light-drying plate 50 is discontinuously distributed. In this embodiment, the scattering layer 505 is symmetrically distributed in the center of the dot. [0022] In the above embodiment, the optical plates 20, 30, 40, 50 are all a unitary structure. The large-sized optical plate of the present invention can be composed of: a plurality of optical plate units of the above-mentioned whole Zhao structure; or each The optical plate unit opens a plurality of light source housings. The shape of the optical plates 20, 30, 40, 50 may be polygonal or circular, etc. in addition to the rectangular shape. [0023] The optical plate unit or the combined optical plate of the present invention may be provided with a plurality of light source accommodating portions, and the light source illuminating diodes of different colors may be used to form a white light mixed light backlight module, or A side-lit light-emitting diode of the same color is made into a backlight module of a specific color" 096129538 Form No. A0101 Page 9 of 20 1003106952-0 H43489 [0024] [0025] [0028] [0030] 096129538 The correction of the distribution of the scattering layers of the spacers in the above embodiments can also be modified as follows. As shown in FIG. 8 , the distribution of the scattering layer 605 on the light-emitting surface 602 is such that a plurality of rectangular closed-type scattering layers 605 are spaced apart from each other around the light source accommodating portion 604 , and the rectangular shape is closed away from the light source accommodating portion 604 . The larger the width of the scattering layer 605, the better the uniformity of the light exiting the optical plate. As shown in FIG. 9, the distribution of the scattering layer 705 on the light-emitting surface 702 is distributed at a distance of 4 M % _ of the light source, and Zanyuan _^3. 7 0 5 The larger the area. This design has

As shown in FIG. 10, the scattering layer 805 is disposed on the light-emitting surface 802_ with the light source receiving portion 804 as a center, and a plurality of mesh-like scattering layers 805 of the same size are spaced along the circular orbit. Distribution, lutefecfeidi nano part 804, dot-like scattering layer 80 5 points. Bu Mi-free | ^ : is conducive to improve the uniformity of light output of the optical board. c In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims. BRIEF DESCRIPTION OF THE DRAWINGS 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. Form Compilation A0101 Page 10 of 20 1003106952-0 1343489 _ March 28, 2014 Correction Replacement Page [0031] FIG. 3 is a perspective view of the optical plate of the backlight module shown in FIG. 4 is a cross-sectional view of the optical plate shown in FIG. 3 taken along line III-III. 5 is a cross-sectional view of an optical plate according to a second preferred embodiment of the present invention. 6 is a cross-sectional view of an optical plate according to a third preferred embodiment of the present invention. 7 is a cross-sectional view of an optical plate of a preferred embodiment 4 of the present invention. 8 to FIG. 10 are schematic diagrams showing various distributions of scattering layers of the optical plate of the present invention. [Main component symbol description] [0037] Backlight module: 200 [0038] Optical plate: 20, 30, 40, 50 [ 0039] Frame: 21 [0040] Reflector: 22 [0041] Prism: 24 [0042] Point source: 25 [0043] Light exit: 202, 602, 702, 802 [0044] Bottom: 2 0 3, 403 [ 0045] Light source housing: 204, 404, 604, 704, 804 [0046] Scattering layer: 205, 505 '605 '705 '805 [0047] Transparent resin: 2052 [0048] Scattering particles: 2054 Form No. A0101 Page 11 / Total 20 pages 096129538 1003106952-0 1343489 Correction replacement π on March 28, 100 [0049] [0055] [0055] [0055]

Long strip V-shaped bumps: 206, 306 bottom plate: 211 side wall: 213 cavity: 217 reflective side wall: 223 light exit: 2 51 base: 253 reflection sheet: 255 intellectual

Property

Office 096129538 Form Number A0101 Page 12 of 20 1003106952-0

Claims (1)

1343489 _ * Correction and replacement page on March 28, 100. Patent application scope: 1 . An optical plate comprising at least one optical plate unit, the optical plate unit comprising a light emitting surface and a bottom surface opposite to the light emitting surface, the improvement The bottom surface is formed with a plurality of elongated V-shaped protrusions, and the bottom surface is provided with at least one light source receiving portion, and the optical plate further includes a scattering layer formed on the light emitting surface, the scattering layer is one of the following three distributions The plurality of rectangular closed scattering layers are spaced apart from each other around the light source receiving portion, and the farther away from the light source receiving portion, the larger the width of the rectangular closed scattering layer is; the light source receiving portion is centered, and the plurality of dot-like scattering The layers are spaced along the circular orbital track, and the farther away from the light source receiving portion, the larger the area of the dot-like scattering layer is; the center of the light source receiving portion is centered, and the plurality of dot-like scattering layers of the same size are spaced along the circular orbit The distribution, and the farther away from the light source receiving portion, the greater the distribution density of the dot-like scattering layer. 2 025毫米。 The optical plate of the invention of claim 1, wherein the apex angle of each elongated V-shaped projection is 60 to 120 degrees; the distance between adjacent elongated V-shaped projections is 0. 025 mm Up to 2 mm. 3. The optical sheet of claim 1, wherein the scattering layer comprises a transparent resin and scattering particles doped in the transparent resin. 4. The optical sheet of claim 3, wherein the transparent resin is an acrylic resin or an epoxy resin; and the scattering particles are one of cerium oxide particles, polydecyl methacrylate particles and glass beads. The optical sheet of claim 1, wherein the apex angle of each of the elongated V-shaped projections and the bottom angle formed by the adjacent elongated V-shaped projections are at least One is rounded. 096129538 Form No. A0101 Page 13 of 20 1003106952-0 H43489 10 096129538 The optical plate of claim 1, wherein the light source receiving portion is a through hole and a blind One of the holes. A backlight module includes a frame, at least one side light point 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; a light source having a light exiting portion is disposed on the bottom plate; the optical plate is disposed in the cavity, the optical plate includes at least one optical plate unit, and the optical plate unit includes a light emitting surface and a bottom surface opposite to the light emitting surface, The improvement is that: the bottom surface is formed with a plurality of strip-shaped V-shaped protrusions, and the bottom of the tower has at least one light source accommodating portion, and the optical plate further comprises a light-emitting portion of the source of the source; a shot layer, the spot light-emitting layer is a closed-rectangular closed shape of the following shape, one of three kinds of dot-like distributions: a light source accommodates a scattering layer, and the width of the over-scattering layer is larger; The scattering layers of the accommodating portion are spaced apart along the circular orbital track, and 5 is far away from the light source accommodating portion, and the area of the scattering layer of the dot-like layer is centered, and the plurality of dots of the same size are spaced apart. The farther away from the light source receiving portion, the greater the distribution density of the dot layer. The backlight module of claim 7, wherein the backlight module further comprises a reflector, the reflector is provided with at least one through hole, the reflector is disposed under the optical plate, and the light exiting portion of the point source Pass through the through hole accordingly. The backlight module of claim 7, wherein the point source is an edge-lit LED, comprising a base, a light-emitting portion fixed above the base, and a reflective member disposed at a top end of the light-emitting portion. . The backlight module of claim 7, wherein the backlight module further comprises a prism sheet disposed on a top of the plurality of sidewalls. Form No. A0101 Page 14 of 20 1003106952-0 1343489 The backlight module of claim 7, wherein the frame is made of a highly reflective material. 12. The backlight module of claim 7, wherein the backlight module further comprises a highly reflective coating applied to the substrate. The backlight module of claim 7, wherein the scattering layer comprises a transparent resin and scattering particles doped in the transparent resin. The backlight module of claim 7, wherein the optical plate is at least one of an apex angle of the elongated V-shaped protrusion and a bottom angle formed by the adjacent elongated V-shaped protrusion. Filleting is done. The backlight module of claim 7, wherein the scattering layer is continuously distributed or spaced apart. The backlight module of claim 7, wherein the optical plate comprises a plurality of optical plate units, and the plurality of optical plate units are closely arranged. 096129538 Form No. A0101 Page 15 of 20 1003106952-0