TWI359990B - - Google Patents

Description

1359990 IX. Description of the Invention: [Technical Field] The present invention relates to a light mixer and a backlight module including the same, in particular, a modular light mixer and a backlight including the same Module. [Prior Art] Referring to Figure 1, there is shown the disclosure of U.S. Patent No. 2,5,059, 519, 195, Al.

A schematic plan view of the backlight module in the case of ignoring the diffusion layer is known. Referring to Figure 2, a cross-sectional view of Figure 1 is shown. The conventional backlight module includes a diffusion layer (not shown), a reflector 10 and a packaged light guide block 20. The light guiding blocks 20 are arranged in an array and are fixed on the reflecting plate 10, and the light guiding blocks 20 are appropriately spaced from each other. Each of the light guiding blocks 20 includes a light guiding body 21, an accommodating space 22 and four LEDs 23, 24, 25, and 26. The material of the light guiding body 2 1 is an acrylic acid gel for light penetration, and the light guiding body 21 is formed in a cylindrical ring shape to form the accommodation space 22 therein. The accommodating space 22 is an air layer that houses the LEDs 23, 24' 25, 26. The LED 23 is a red LED for emitting red light; the LED 24 is a green LED for emitting green light; the LED 25 is a green LED 'for emitting green light; the LED The 26 series is a blue LED for emitting blue light. The light emitted by the LEDs 23, 24, 25, 26 of the above structure can be mixed into a white light in the air layer of the accommodating space 22 and then emitted outward. However, since the LEDs 23, 2, 7, 25% are naturally mixed in the air, the light mixing efficiency is not high, and the thickness of the conventional backlight module I18501.doc cannot be effectively reduced; The number of LEDs required for the backlight module cannot be effectively reduced, which not only consumes power but also reduces manufacturing costs. Therefore, it is necessary to provide an innovative and progressive light mixer and a backlight module including the same to solve the above problems. SUMMARY OF THE INVENTION A primary object of the present invention is to provide a backlight module including a plurality of light mixers and a diffusion layer. The light mixers are arranged in an array on a plane. Each of the light absorbers comprises a light mixing plate mixed with a plurality of diffusion particles, a plurality of light sources, a plurality of upper reflection layers, a lower reflection layer and a half penetration layer. . The haiguang plate has an upper surface, a lower surface, a peripheral surface and a plurality of apertures, and the light mixing plate has a first refractive index, the diffusion particles have a second refractive index, and the second refractive index The difference in the first refractive index is from 0.01 to 2.00. The illumination sources are respectively located in the accommodating holes. The upper reflective layers are located directly above the illumination sources. The lower reflective layer is located at . The surface below the light plate. The semi-transmissive layer covers the outer surface of the light mixing plate. The diffusion layer is located above the light mixers. "Haiguang module is composed of these modularized light mixers, without the need for a large-scale light guide plate, so it is easy to manufacture, simple in process, low in manufacturing cost and easy to maintain. Furthermore, by the special design of the light mixer and the doping of the diffusion particles, the brightness and the uniformity can be improved. If the area of the light mixing plate is 50 mm×5 〇mm or more, the backlight module can reduce the brightness. The number of light combiners' in turn reduces the number of such light sources. [Embodiment] Referring to Fig. 3, there is shown a cross-sectional view of a backlight module according to a first embodiment of the present invention, which is intended to be H8501.doc 1359990. Referring to Fig. 4, there is shown a top plan view of the backlight module of the first embodiment of the present invention in the case of ignoring the diffusion layer. The backlight module 3 includes a plurality of light mixers 4 and a diffusion layer 31. The light mixers 4 are arranged in an array and immediately adjacent to a plane. The diffusion layer 3 is located above the light mixers 4. Preferably, the light mixers 4 and the diffusion layer 31 have an appropriate distance, and a plurality of optical films (not shown) are attached to the diffusion layer 31 to increase the optical effect.

At the same time, referring to Fig. 5', a cross-sectional view of the light combiner of the first embodiment of the present invention is shown. The light mixer 4 includes a light mixing plate 41 mixed with a plurality of diffusing particles (not shown), a plurality of light emitting sources, a plurality of upper reflecting layers 42, a lower reflecting layer 43, and a half penetrating layer 44. The light mixing plate 41 has an upper surface 4, a lower surface 412, a peripheral surface 413, and a plurality of receiving holes 414. The material of the light mixing plate 41 is selected from the group consisting of polymethyl methacrylate (pMMA) and copolymers thereof, polycarbonate (PC) and copolymers thereof, cycloolefin copolymer (coc), metallocene cyclic olefin copolymer ( mC〇c), polystyrene (ps) and

The group of copolymers, polyethylene terephthalate (PET) and copolymers thereof, glass, and mixtures thereof has a first index of refraction. Preferably, the light mixing plate 4 is a light guide plate. In the present embodiment, the light mixing plate 41 is a tetragonal structure having a uniform thickness, and the upper surface 4 ι and the lower surface 412 are both planar and parallel to each other. The upper surface 4 ι is a light exit surface. The peripheral surface 413 of the light mixing plate 41 includes four faces. It can be understood that the light-mixing plate 4! can also be a triangle or a pentagon or other other polygonal shape in a plan view. In the embodiment, the lower surface 412 of the light-mixing plate 41 has a full destruction of I18501.doc 1359990 to emit blue light. However, in other applications, the number of such LEDs can be three or five. The LED of the present invention is not limited to its type, that is, a side-emitting LED 'Batwing LED' and a Lambertian LED are applicable.

The upper reflective layers 42 are located directly above the illumination sources. In this embodiment, the upper reflective layer 42 is located in the hole wall of the receiving hole 414, and is located directly above each LED, and the upper reflective layer 42 is used for the LEDs 45, 46, 47, The light that is directed upward is reflected into the light mixing plate 41 to be mixed. It can be understood that the upper reflective layer 42 can also be located on the upper surface 411 of the light mixing plate 41 at a position relative to the accommodating holes 414. In addition, the light absorbing device 4 further includes a plurality of optical materials respectively disposed between each of the LEDs and each of the upper reflective layers 42 , that is, the optical materials are filled in the accommodating holes 414 . Space to increase optical properties.

The lower reflective layer 43 is located on the lower surface 412 of the light mixing plate 4 1 for reflecting the light emitted by the LEDs 45, 46, 47, 48 into the light mixing plate 41 for mixing. The semi-transmissive layer 44 covers the peripheral surface 413' of the light-mixing plate 4 to reflect a part of the light emitted by the LEDs 45, 46, 47, 48 into the light-mixing plate 41 for mixing. The transflective layer 44 has a transmittance of 30% to 100%, preferably 35% to 99%, so that part of the light passes through to eliminate the image of the dark band between the two light mixers 4. (Mura), making the light emitted by the light mixers 4 more uniform. Preferably, the semi-transmissive layer 44 further comprises a plurality of through holes. The backlight module 3 is composed of the modularized light mixers 4, and does not require a conventional large number of light guide plates, so that the manufacturing process is simple and the process is relatively simple. 18501 .d〇c •10- 1359990

Single and low manufacturing costs. In addition, due to the modular design, the backlight module 3 is also relatively easy to maintain. Furthermore, since the area of the light mixing plate 41 reaches 50 mm X 50 mm or more due to the special setting of the light-mixing device 4 of the present invention, the backlight module 3 can be reduced in the backlight module 3. The number of light mixers 4, which in turn reduces the number of LEDs. In addition, it can be understood that when the light mixers 4 are arranged in an array to form the backlight module 3, the light diffusers 4 may not need the semi-transparent layer 44 because the light mixers 4 are There is an air layer between the light, and the light entering the air layer by the light mixing plate 41 will cause refraction and total reflection, which can increase the light mixing effect.

Referring to the drawings, there is shown a cross-sectional schematic view of a light combiner of a second embodiment of the present invention. The light mixer 5 of the present embodiment is substantially the same as the light mixer 4 (Fig. 5) of the first embodiment, wherein the same elements are given the same reference numerals. The difference between the light mixer 5 of the present embodiment and the light mixer 4 of the first embodiment is that, in the present embodiment, the light mixing plate 4 1 has a non-uniform thickness, and the upper surface 4 is The flat surface 4 12 is a Free Form Surface. It can be understood that the lower surface 412 of the light mixing plate 41 can also be a curved surface or a sloped surface, that is, the lower surface 412 is not parallel with the upper surface 411 to form a tapered surface. Referring to Figure 7', there is shown a cross-sectional view of a light-mixer according to a third embodiment of the present invention. The light-mixer 6 of the present embodiment is substantially the same as the light-mixer 4 (Fig. 5) of the first embodiment. The same number. The difference between the light mixer 6 of the present embodiment and the light mixer 4 of the first embodiment is that, in the embodiment, the plate has a thick and thin surface, and the upper surface 411 is a free curved surface. The lower surface 412 is planar.

Il8501.doc 1359990 Referring to Figure 8', there is shown a cross-sectional schematic view of a light combiner of a fourth embodiment of the present invention. The light combiner 7 of this embodiment is substantially the same as the light combiner 4 (Fig. 5) of the first embodiment. The same components are given the same reference numerals. The difference between the light mixer 7 of the present embodiment and the light mixer 4 of the first embodiment is that, in the embodiment, the upper surface 4 11 of the mixed light plate 4 1 is opposite to each of the receiving holes. There is a recess 6 1 ' at the position of 4 14 . The recess 61 is used to reflect the upward light of the LEDs 45, 46, 47, 48 into the light mixing plate 41 for mixing.

Referring to Figure 9', there is shown a cross-sectional schematic view of a light combiner of a fifth embodiment of the present invention. The light combiner 8 of this embodiment is substantially the same as the light combiner 7 (Fig. 8) of the fourth embodiment, and the same elements are assigned the same reference numerals. The difference between the light-mixer 8 of the present embodiment and the light-mixer 7 of the fourth embodiment is that the light-receiving holes 414 of the fourth embodiment are arc-shaped above the accommodating holes 414. In the light condenser 8 of the present embodiment, the upper portions of the accommodating holes 414 are straight, that is, the cross-sections of the accommodating holes 414 are rectangular.

Referring to Figure 10', there is shown a cross-sectional schematic view of a light combiner of a sixth embodiment of the present invention. The light combiner 9 of this embodiment is substantially the same as the light combiner 4 (Fig. 5) of the first embodiment, and the same elements are given the same reference numerals. The difference between the light mixer 9 of the present embodiment and the light mixer 4 of the first embodiment is that, in the embodiment, the receiving holes 414 are through holes, and the upper reflecting layers 42 are Located on the upper surface 411 of the light mixing plate 41 at a position relative to the accommodating holes 4M. Referring to Figure 11, there is shown a top plan view of a light combiner of a seventh embodiment of the present invention. The light mixer 1 〇 A of this embodiment is substantially the same as the light mixer 4 (圊 5) of the first embodiment, in which the same elements are assigned the same bat number. The difference between the light absorbing device 10 A of the present embodiment and the light absorbing device 4 of the first embodiment is that, in the embodiment, the light mixing plate 41 further includes a plurality of scattering holes 81. Located at the periphery of the accommodating holes 414. The scattering holes 81 may be through holes or blind holes' and preferably have an irregular shape for diffusing or scattering light emitted by the LEDs 45, 46, 47, 48. The present invention is illustrated by the following examples, which are not intended to be construed as limiting the invention. Example 1:

According to the fourth embodiment of the present invention, the light mixer 7 (FIG. 8) is designed to replace the diffusion particles of the Acrylate copolymer having a particle diameter of 1·8 μηι in the material of the light mixing plate 41, and the concentration thereof is relative. 5 wt% (wt%) of the light mixing plate 41. The material of the light mixing plate 41 of the light mixer 7 is polymethyl methacrylate PM (PMMA), and the first refractive index is 1.49. The second refractive index of the diffusing particles is 丨.50. The arrangement of the LEDs in the light mixer 7 is as follows: LED 45 is a red LED, LED 46 is a green LED, and LED 47 is a green light.

LED, LED 48 is a blue LED. The measurement results of the measuring instrument are as follows, the maximum brightness is 349 〇 cd/m2, the minimum brightness is 2963 Cd/m2, the average brightness is 3193 ed/m2, and the uniformity is 84.92%. If the diffuser 7 of the fourth embodiment is not doped with any diffusion particles, the measurement result is as follows: the maximum brightness is 3213 cd/m2, and the minimum brightness is 2480 Cd/m2', and the average brightness is 2752 cd/m2, which is uniform. The degree is 771^/〇. Therefore, it can be seen that in the present example, after doping the diffusion particles, the brightness is increased by about 2%, and the uniformity is also improved.

Il8501.doc 13 1359990 Example 2: The light mixer 8 (Fig. 9) according to the fifth embodiment of the present invention is designed to have a particle size of 1 Acryiate copolymer in a light mixing plate 4i. The diffusion particles 'and their concentrations are 5 weight percent (wt%) with respect to the light mixing plate 41. The material of the light mixing plate 4 of the light mixer 8 is polymethyl methacrylate (PMMA), and the first refractive index is 丨49. The second refractive index of the diffusing particles is 丨.50. The arrangement of the LEDs in the light mixer 8 is as follows: LED 45 is a red LED, LED 46 is a green LED ‘ LED 47 is a green LED ’ LED 48 is a blue LED. The measurement results of the measuring instrument are as follows, the maximum brightness is 3462

Cd/m, the minimum brightness is 2794 cd/m2, the average brightness is 3233 cd/m2, and the uniformity is 80.70%. If the light mixer 8 of the fifth embodiment is not doped with any diffusion particles, the measurement result is as follows: the maximum brightness is 2998 cd/m2, the minimum brightness is 2317 ed/m2, and the average brightness is 2643 cd/m2, which is uniform. The degree is 77.29%. Therefore, it can be seen that in the present example, after doping the diffusion particles, the brightness is increased by about 2%, and the uniformity is also improved. Example 3: According to the fifth embodiment of the present invention, the light mixer 8 (FIG. 9) is designed to dope the material of the light mixing plate 41 with a diffusion particle of 8 μm styrene and acrylate copolymer (ps_Acrylate), and The concentration is 5 weight percent (wt%) with respect to the light mixing plate 41. The material of the light mixing plate 41 of the light mixer 8 is polymethyl methacrylate (PMMA), and the first refractive index is 丨.49. The second refractive index of the diffusing particles is 1.53. The arrangement of the LEDs in the light mixer 8 is 118501.doc 1359990. The mode is as follows: LED 45 is a red LED, LED 46 is a green LED, LED 47 is a green LED, and LED 48 is a blue LED. The measurement results of the measuring instrument are as follows, the maximum brightness is 347i cd/m, the small brightness of the farm is 2900 cd/m2, the average brightness is 3220 cd/m2, and the uniformity is 83.55%.

The light mixer 8 of the fifth embodiment is not doped with any diffusion particles, and the measurement results are as follows. The maximum brightness is 2998 cd/m2, the minimum brightness is 2317 cd/m2, and the average brightness is 2643 ed/m2. The degree is 77 29%. Therefore, it can be seen that in the present example, after doping the diffusion particles, the brightness is increased by about 2%, and the uniformity is also improved. The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the scope of the present invention. The scope of the invention should be as set forth in the appended claims. [Simple description of the map]

FIG. 2 is a schematic cross-sectional view of the conventional backlight module disclosed in US Patent Publication No. 2005/0259195 A1, ignoring the diffusion layer; FIG. 2 is a cross-sectional view of FIG. 1; FIG. 4 is a schematic cross-sectional view showing the backlight module of the first embodiment of the present invention in the case of ignoring the diffusion layer; FIG. 5 is a cross-sectional view showing the light mixer of the first embodiment of the present invention; FIG. 7 is a cross-sectional view showing a light combiner of a second embodiment of the present invention; FIG. 7 is a cross-sectional view showing a light combiner of a third embodiment of the present invention;

Figure 8 is a cross-sectional view showing a light combiner of a fourth embodiment of the present invention; Figure 9 is a cross-sectional view showing a light combiner of a fifth embodiment of the present invention; and Figure 10 is a view showing a sixth embodiment of the present invention. A schematic cross-sectional view of a light mixer; and FIG. 11 is a top plan view of a light combiner of a seventh embodiment of the present invention. [Main component symbol description]

3 The backlight module 4 of the first embodiment of the present invention The light mixer 5 of the first embodiment of the present invention The light mixer 6 of the second embodiment of the present invention The fourth embodiment of the present invention The fourth embodiment of the present invention Example of the light combiner 8 The light combiner of the fifth embodiment of the present invention The light combiner 10 of the sixth embodiment of the present invention The light combiner 10 of the seventh embodiment of the present invention, the reflector 20, the light guide block 21, the light guide body 22 Storing space 23 LED 24 LED 25 LED 26 LED 31 Diffusion layer 41 Light mixing plate 42 Upper reflective layer 118501.doc 1359990 43 Lower reflective layer 44 Semi-transmissive layer 45 LED 46 LED 47 LED 48 LED 49 Base 61 Dent 81 Scattering Hole 411 upper surface of light mixing plate 412 lower surface of light mixing plate 413 peripheral surface of light mixing plate 414 receiving hole 415 microstructure

Il8501.doc

Claims (1)

Patent Application No. 096117266 X. Patent Application Scope: Renewal (10) September) 1 · A kind of light mixer, including: t&lt;o year and month&gt;^3 correction super-doped with a plurality of diffusion particles The light mixing plate has an upper surface, a lower surface, a peripheral surface and a plurality of receiving holes. The light mixing plate has a first refractive index, and the diffusion particles are used to diffuse light in the light mixing plate, and the diffusion particles have a second refractive index, the second refractive index being different from the first refractive index, wherein the accommodating holes are blind holes, and the upper surface of the optical plate is opposite to each of the accommodating holes The position has a recessed hole; a plurality of light-emitting sources are respectively located in the receiving holes; the lower reflective layer is located on the lower surface of the light-mixing plate; and a half-transparent layer covers the peripheral surface of the light-mixing plate. 2 - The light mixer of claim 1, wherein the light mixing plate has a uniform thickness, and both the upper surface and the lower surface are flat. 3' The light concentrator of claim 1, wherein the light mixing plate has a non-uniform thickness. 4_ The light concentrator of claim 3, wherein the upper surface or the lower surface of the light mixing plate is a flat surface, and the other surface is a free curved surface. 5. The light mixer of claim 1, wherein the lower surface of the light mixing plate has a structure that destroys total reflection. 6. The light mixer of claim 1, wherein the upper surface of the light mixing plate has a structure that destroys the king reflection. 7. The light mixer of claim 1, wherein the light mixing plate further comprises a plurality of scattering holes </ RTI> located at the periphery of the accommodating holes. 118501-1000922 9. 10. 11. 12. 13. 14. 15. 16. 17. 3 The light mixer of item 1 has a hole 'for some light to pass through. The light absorbing device of claim 1, wherein the semi-transparent layer further comprises a plurality of transmissive layers, the transmissive layer has a transmittance of 30 〇/〇 to the light mixer of claim 1, and A plurality of upper reflective layers are included, respectively, directly above the illumination sources. The light mixer of claim 10 further comprising a plurality of optical materials between each of the light sources and each of the upper reflective layers. The light mixer of claim 1, wherein the material of the diffusion particles is selected from the group consisting of polyester resins, acrylic resins, polyolefin resins, and inorganic particles. The light concentrator of claim 1, wherein the second refractive index of the diffusing particles is 〇 〇1 to 2.00. Such as. The light diffuser of the cyan term 1 wherein the particle diameter of the diffusing particles is 〇 1 μηη to 1 〇〇 μπι. The light mixer of claim 1, wherein the concentration of the diffusing particles is from 0.5 to 50% by weight relative to the light mixing plate. The light mixer of claim 1, wherein the material of the light mixing plate is selected from the group consisting of poly(methyl methacrylate) and its copolymer, polycarbonate (pc) and copolymer thereof, and cyclic olefin copolymer (COC). a group of metallocene cyclic olefin copolymers (mCOC), polystyrene (PS) and copolymers thereof, polyethylene terephthalate (PET) and copolymers thereof, glass, and mixtures thereof. A backlight module comprising: a plurality of light mixers arranged in an array on a plane, each 118501-1000922 13.59990 a light mixer comprising: 々 correction replacement - a light mixing plate doped with a plurality of diffusion particles Having an upper surface, a lower surface, a peripheral surface, and a plurality of accommodating holes, the light mixing plate has a -first refractive index, and the diffusion particles are used to diffuse light in the light mixing plate, and the diffusion particles have a a second refractive index, the second refractive index being different from the first refractive index, wherein the accommodating holes are blind holes, and a position of the upper surface of the light mixing plate relative to each of the accommodating holes Have 'a recess; A plurality of light sources are respectively located in the receiving holes; and a lower reflecting layer is located on a lower surface of the light mixing plate; and a diffusion layer is located above the light mixing devices. The backlight module of item 17, wherein the light mixer has an appropriate distance from the diffusion layer. The backlight module of claim 17, wherein the light mixing plate of the light mixer has a uniform thickness, and both the upper surface and the lower surface are flat. 19. The backlight module of claim 17, wherein the light mixing plate of the light mixer has a non-uniform thickness. 21. The backlight module of claim 20, wherein the surface of the light mixing plate of the light mixer is planar, and the lower surface of the light mixing plate is a free curved surface. 22. The backlight module of claim 17, wherein the lower surface of the light mixing plate of the light mixer has a structure that destroys total reflection. 23' The backlight module of claim 17 wherein the surface of the light mixing plate of the light mixer has a structure that destroys total reflection. 24. The backlight module of claim 17, wherein the light mixing plate of the light mixer further comprises 118501-1000922 K, and the replacement of the month j can include: a plurality of scattering holes located outside the receiving holes. &quot;~---:, the backlight module of the monthly item 17, wherein the semi-transmissive layer of the light mixer further comprises a plurality of through holes for a part of the light to pass through. t. The backlight module of claim 17, wherein the transmissive layer of the light mixer has a transmittance of 30% to 1%. . The backlight module of the monthly item 17 further includes a plurality of upper reflective layers, which are located directly above the light sources. 25. 26. 27. 28. The backlight module of claim 27, wherein the light mixer further comprises a plurality of light-emitting materials disposed between each of the light-emitting sources and each of the upper reflective layers. The backlight module of claim 17 wherein the materials of the diffusing particles are selected from the group consisting of a free-bulk resin, an acrylic resin, a polyolefin resin, and inorganic particles. The backlight module of claim 17, wherein the second refractive index of the diffusing particles is 0.01 to 2.00. The backlight module of claim 17, wherein the diffusion particles have a particle size of 〇·1 μιη to 1 〇〇 μιη. 32. The backlight module of claim 17, wherein the concentration of the diffusing particles is from 5 to 50% by weight relative to the light-mixing plate. 33. The backlight module of claim 17, wherein the material of the light mixing plate is selected from the group consisting of polymethyl methacrylate (M) and copolymers thereof, polycarbonate (PC) and copolymers thereof, and cyclic olefin copolymerization. (COC), metallocene cyclic olefin copolymer (mCOC), polystyrene (PS) and copolymers thereof, polyethylene terephthalate (PET) and copolymers thereof, glass and mixtures thereof 118501 -1000922 13.59990 -a- ~ ·,_·ι·| -»-» ι_ _ __ | .......... Group. 118501-1000922