TW200539473A - Uniform color-mixing package device - Google Patents

Abstract

A uniform color-mixing package device is provided with a source unit, a color-mixing unit, and a combination unit, the package device is characterized that the source unit comprises light sources more than one, like light emitting diodes (LEDs). Color-mixing unit makes each color mix uniformly, and color-mixing unit is fixed on the source unit by combination unit.

Description

200539473 V. Description of the invention (1) [Technical field to which the invention belongs] The present invention provides a highly replaceable highly uniform color mixing package module, which can easily adjust the light distribution angle of the light source unit and improve the uniformity of color mixing, reducing the overall light source. Uniform color mixing packaging device for color difference. [Previous technology] According to the current production method of white light emitting diode (LED), the most common technology is to use blue or ultraviolet light emitting diodes and fluorescent powder to excite them to mix into white light. The conversion efficiency itself is not good, so the efficiency of white LEDs produced by this method is not good, and white LEDs that use blue light to excite phosphors are generally poor in color rendering. Furthermore, with this type of fluorescent The white light LEDs achieved by means of photo-powder excitation are the basic patents of Japan's Nichia and cannot be broken. In addition to the above phosphor excitation method, another method is to use multiple red, green, and blue light-emitting diode chips to participate in color mixing, and change the color of the final LED by adjusting the respective current intensity. To achieve the required white or full color light. With this method, the number of LEDs that are modulated into white light can be at least two or more, depending on the color of the chip. When the number of LED crystals is increased, the color rendering index can reach more than 95. Furthermore, the color mixing in this way Does not require phosphor excitation, so its efficiency (lumens / watt) will be higher, and most importantly, the goal of full color can be achieved by multi-chip mixing, and various colors can be adjusted by LED When the LED is used as the light source to mix colors, the color spectrum of the LED is narrow and the color gamut (COLOR GAMUT) is very wide. With the current technology, it can reach more than 143% NTSC, which can achieve future LCD TV and other displays. Very high demand saturation

Page 5 200539473 5. Description of the invention (2) degrees, and at this time, the white point can not be achieved by copper-color mixing. And these are very difficult to uniformly mix colors by using calcined powder excitation, 2 operations. However, due to the use of multiple LEDs for full-color light, it is currently encountering color mixing. This kind of RGB multiple chip technology is used to mix products. At present, the conventional technique is the bottleneck of the sentence, so there are fewer 14-type packages on the market. The three colors of RGB T = are the traditional packaging methods (the technology used by the shell US 5 2 6 6 W7) Encapsulated as a full-color RGB LED, such as concentrating light, but this patent is based on the principle of imaging in geometric optics after using three crystals to reflect inside the cup ;: the effect of condensing light with a flexible package, measured according to international experiments *, Finally, according to the observations, the simulation analysis is separated from the reality, and the color spots of 2 to 2 on each chip face will be

Only the daggers are separated from each other, so such RGB LEDs cannot form a uniform hook ... the whole will not completely overlap, and the color of the mixed color will not be uniform, so the color difference after the overall color mixing will be very Big. This is a common shortcoming of many RGB chips on the market when they are packaged into white LEDs and their colors are very uneven. The patent No. US58U 丨 77 is an improvement on the poor uniformity of RGB LEDs, because the traditional design mode (0 | 〇 丨 d 丨 ng) is still used. Therefore, it emphasizes the light source directivity and also loses the light source. Evenness. And its definition of light source uniformity is not clear. In US6 6 1 0 5 9 8 this patent discusses the use of microstructure manufacturing to produce microstructures on the mold surface to replace the traditional shell-type mold design. The geometry of the microstructure includes wavy shapes, concentric circles, and so on. The patent emphasizes that in order to make use of the surface mold processing of this microstructure, a single surface-adhesive LED (SMD LED) can increase the optical efficiency of light output from the chip, but it does not mention how to improve the uniformity of the light source color when multi-die packaging, and Its seal

Page 6 200539473 V. Description of the invention (3) The package is a one-piece package, and the actual claimed micro-structure shapes such as spheres and concentric circles can also be understood through optical simulation analysis, and the purpose of uniform color mixing cannot be achieved. Therefore, the current LED packaging structures of RGB multi-chip mixed color on the market have failed to propose a significant and innovative design for uniform mixing of multi-chip LEDs. After many articles and experimental verifications, it can be understood that at the same time, the requirement that the color of the light source be mixed uniformly and that the light distribution angle with a small angle is contrary to each other, that is, a large-angle light distribution light source, such as RGB polycrystalline Granular packaged SMDLEDs often appear close to Lamberti (ο η) light sources, which are characterized by a half-power full angle of about 120 degrees, and the brightness (Luminance) is almost unchanged under various viewing angles, and the intensity (I ntensity) is presented The cosine function changes. And this kind of SMD LED can have a very good uniformity of light mixing within the viewing angle range that human eyes are concerned about. However, due to practical requirements, LED light sources often require a small-angle light distribution half-power full-angle to enhance the brightness of the LED, but if you design an LED package with a slightly smaller light distribution angle, the uniformity of this LED color will be drastic Deterioration, that is, the small-angle requirement of half-power full-angle full-power distribution of RGB white LEDs currently on the market, and the color uniformity of mixed light are just mutually inhibiting. That is, when the half-power full-angle angle is large, the color mixing is good; when the half-power full-angle angle is small, the color mixing is poor. [Summary of the Content] The conventional multi-grain mixed color LED requires a small angle of light distribution, so the LED mold package must be changed to focus the light, but once the angle becomes smaller, the light spots of each color cannot be closely overlapped, causing Very little color distribution on the imaging surface

Page 7 200539473 V. Description of the invention (4) Uniform, this kind of RGB multi-color LED mixed color simulation white light or full-color light source, after hitting the object, you will see different RGB halo at the edge of the light, and When the human eye directly looks at this poorly mixed full-color light source, it is easy to see the space and angle separation of each color due to direct imaging on the optic gland. The present invention provides a light source device that effectively reduces the color difference distribution after light mixing. Its principle is to achieve the light mixing mechanism through non-traditional imaging optics. The light emitted from the light source bodies of uneven colors is partially large in angle. After the light is refracted by the color mixing unit structure of the present invention, the light will be returned in the opposite direction, which is equivalent to the action of a spatial filter (Spatia 1 fi 11 er), and equivalently increases the optical path of each color. The LED reflection cup is reused to increase the optical efficiency. The color mixing unit can reduce the final volume of the color mixing device structure more effectively due to the use of surface microstructures. More meaningfully, the final light distribution angle can be reduced much. The chromatic aberration of the led light source after the reduction will not only increase within the range of the human eye, but also reduce it a lot, it is better than the previous large-angle SMD LED, and the chromatic aberration is much reduced. Furthermore, by combining and replacing various types of light source units and color mixing units, the required light distribution angle can be adjusted to achieve modularity, convenience, and easy-to-mass production of color mixing device modules.

[Embodiment] The color mixing and packaging device of the present invention includes: at least one light source unit, combining unit, color mixing unit, etc. The following description and drawings can further understand the implementation

Page 8 200539473 V. Description of the invention (5) Examples and structure and function of each unit. Please refer to FIG. 1A and FIG. 1B. For the mixed color light source device of the previous case, the RGB LED chip 2 emits light with different currents and voltages provided by the wire 3, and light is emitted from the electrons and holes of the chip 2 to the active layer (A ctive 1 ayer) to emit photons. Part of the light directed towards the rear is directed to the reflection cup 4, which generally provides functions of light distribution, light collection, and change of light direction. Mould 1 provides the function of concentrating and distributing light similarly to reflector cup 4. By designing the mould 1 and reflector 4 at the same time, the light distribution type required by the light source can be designed. Figure 1A and Figure 1B are the basic architecture of traditional RGB LED color mixing. Since this RGB LED uses the mold 1 and the reflection cup 4 according to the object image relationship of geometrical optical imaging, each chip has its own imaging. In contrast, the final color mixing is extremely uneven. Please refer to FIG. 2, which is a device module of the present invention, which includes an LED-based light source unit, a combination unit, and a color mixing unit. The light source unit used in the present invention in FIG. 2 can be a variety of light source bodies that require color mixing, such as fluorescent tubes and neon tubes of various colors. The light source is most suitable for using various organic and inorganic light emitting diodes (OLED, LEDs). ) Various types of packaging, such as traditional cannonball-type 5 mm, 3 mm or surface-adhesive LED (SMD LED), SMT, CHIP ON BO ARD (COB), piranha type, and other forms of LED packages. In this embodiment, a plurality of red (R), green (G), and blue (B) LED chips are used. Piranha-type and SMD-packaged LEDs are used as the light source for the experiment of the present invention. The LED chip can be bonded and bonded by solid crystal, wire bonding, or Flip chip after resin encapsulation. It can be used as a light source unit. Refer to Figure 3A ~ J for various types of packaging types common to this light source unit. With a suitable heat sink substrate

Page 9 200539473 V. Description of the invention (6) and driving circuits and mechanisms. Because there are too many types of LED packages, Figures A ~ J list common packages, including high-power packaged LEDs, traditional cannonball LEDs, and piranhas. LED, SNAP LED, SMD LED and other package types. Referring to Figure 4A, the asymmetric pyramid-shaped structure body of the color mixing unit is made of a translucent material. One surface of the color mixing unit is composed of a microstructure. The surface of the color mixing unit shown in Figure 4 The geometric structure is a small specific geometric structure repeatedly and randomly or regularly arranged. Please refer to Figure 5. Figure 5A is a conical structure, Figure 5B is a truncated cone structure, Figure 5C is a pyramid, Figure 5D is a truncated pyramid, Figure 5E is an asymmetric pyramid type, and Figure 5F is Hexagonal pyramid, Figure 5G is a frustum cone with curvature change. Each figure shows the microstructure geometry and type of the color mixing unit. The length and width of each structure in the microstructure range from about 10 to 300 microns, and its size depends on the size of the LED chip structure currently used. Coordinated changes, the microstructures can be randomly or regularly repeated, and the random arrangement can even increase the uniformity. The material of the color mixing unit structure body can be polycarbonate (PC), acrylic (PMMA), resin (EPOXY ) And other light-transmitting materials, this embodiment is made of PC, and the manufacturing of the color mixing unit can be achieved by micro-processing technology and the like. Please refer to Figure 6A ~ D again. The figure shows how the combination unit in this module connects the light source unit and the color mixing unit. This combination unit is between the color mixing unit and the light source unit. It is a unit that connects the two. With the combination unit, the light source unit and the color mixing unit can be connected and fixed, and different light source units and color mixing units can be replaced at will by virtue of the advantages of the combination unit. This combination unit can also be used when making the light source unit and color mixing unit.

Page 10 200539473 V. Description of the invention (7) Injection molding and other methods are made at the same time to achieve the convenience of future module combination. Referring to FIG. 6, the actual form of the coupling unit is shown in FIG. 6A, which is a corresponding groove of the male and female counterparts, which are fixed by directly locking the tongues to each other. Or, as shown in Figure 6B, the sliding slot can be replaced like a magnetic disk. The combination unit structure may be a thread-like structure and a thread groove common in FIG. If the replacement of the light source and the color mixing unit is not considered, the combination unit can be directly fixed by fixing the light source unit and the color mixing unit with a mixture of resins as shown in Fig. 6D. Figure 6E shows that the combination unit can quickly replace the light source unit and the color mixing unit to achieve the modularity of the light distribution angle of the color mixing device. In addition, after the combination unit exists, the light source unit and the color mixing unit can be further changed. A buffer medium unit is provided. The characteristic of this buffer medium unit is to provide a medium different from the junction between the light source unit and the color mixing unit, which provides the ability to collect light. The optical simulation analysis diagrams of the seven small pictures in Figure 6F show that the unit is replaced by the combination unit. The light distribution curve results generated by different color mixing units after the light source units of the same type of SMD LEDs. The horizontal coordinate unit of each small graph in Figure 6F is the angle, and the vertical coordinate is the relative intensity. It can be seen from the figure that the uniform color mixing packaging device of the present invention has excellent light collecting ability, and the angle can also be controlled by design. Figure 7A shows the appearance of a special TI RR's focusing mode. This special mode is known for its high efficiency and strong focusing power. If it is matched with this nuclear force, the SMD RGB LED is similar to that shown in Figure 7B. In order to check the respective light distribution curves of the RGB three grains, it can be seen that the three color angles are completely separated. In fact, the experimental calculation of the angular color difference is quite large. The color difference calculation is based on the UV coordinates of CIE 1 9 6 4 , You can measure the spectrum and intensity

Page 11 200539473 V. Description of the invention (8) The result is calculated and the relative color difference of each angle is calculated based on the zero point of the optical axis. Figure 7C shows the light distribution curve of the conventional traditional package lens structure measured on RGB SMD LEDs. It can be seen that the three-color light distribution curve is not as separated as the previous result using TIR-R, but it is still Obvious separation, for human eyes, you can still see the uneven color mixing results of each color separation. And referring to FIG. 7D, it is a uniform color mixing packaging device formed by the same LED structure of the RGB SMD LED in the color mixing unit of the present invention. It can be seen that the light distribution curves of RGB are almost overlapped and represent the angular distribution of each color of RGB. Almost completely consistent. The half-power full-angle angle can also be effectively reduced to about 60 degrees, which means that such a color mixing device and the light collecting effect are very good. Referring to FIG. 7E, it can be understood that when the SMD LED is used as the light source unit, the final relative color difference changes when using the TI RR mold force and using the uniform color mixing packaging device of the present invention. It can be seen that the last relative color difference using the present invention is three The smallest of them. When the light source unit we choose becomes a piranha packaged RGB LED, see Figure 8A for the light distribution curve of the red light piranha LED at various ZENITH angles of 0, 45, and 90 degrees. Curve, FIG. 8B is the light distribution curve of the green light chip at the ZENITH angle of 0 degrees, 45 degrees, and 90 degrees, and FIG. 8C is the light distribution curve of the blue light chip at the ZENITH angle of 0 degrees, 45 degrees, and 90 degrees. It can be clearly seen that not only the RGB three-color light distribution curves are different from each other, they will not overlap, and even the RGB light distributions will not be rotationally symmetrical. Therefore, if this RGB chip is used, the color difference of its mixed light must be Very large, in fact, the color difference (delta UV) that the human eye can not distinguish is about 0. 0 0 8 or less,

Page 12 200539473 V. Description of the invention (9) The color difference of the LEDs packaged by this piranha is more than about 0.03, so the eyes can easily see the unevenness of the color separation, so it is often on the market. This kind of piranha-type RGB LED products have such disadvantages. Finally, please refer to FIG. 8D, which shows that the original piranha type LED with a poor light type is used as the light source unit, which is then combined with the color mixing unit composed of different size conical micro-structures in the present invention, and then the original piranha Comparison chart of the color difference of various light sources when the LED type is used without color mixing unit. It can be seen that the color difference of the uniform color mixing packaging device of the present invention is significantly reduced, and according to the above experimental verification, it is understood that the present invention-the uniform color mixing packaging device has the advantages of effectively reducing the color difference and also can appropriately modify the light type. In summary, the mixed-color packaging device of the present invention can indeed achieve the purpose of the invention and meet the requirements of the invention patent, but the above is only a preferred embodiment of the present invention. Any changes made according to the present invention are still Should be included in the scope of this patent application. [Label comparison] 1 LED mold force 2 RGB LED chip 3 Lead wire 4 Reflective cup 5 Color mixing unit 6 Combined with xjxy —- Early stage 7 Light source unit 8 Micro structure 9 Tenon structure 10 Slot structure 11 Thread groove structure 12 Micro structure 13 bracket 14 light

Page 13 200539473 Brief description of the drawings The first picture A and the first picture B are the traditional RGB multi-die LED color mixing light source device in the previous case, which is characterized by condensing but with very uneven color mixing. The second figure is a light source unit, a color mixing unit, and a combining unit included in the uniform color mixing packaging device of the present invention. The third figures A to J are schematic diagrams of the light source unit of the uniform color mixing packaging device of the present invention. Among them, Figure 3A is a high-power packaged LED, Figure 3B is a traditional cannonball type LED, Figure 3C is a piranha LED, Figure 3D is a BUTTERFLY type LED, and Figure 3E ~ J are various packages of SMD LEDs. The fourth figure is an asymmetric tower pyramid-type microstructure of the color mixing unit structure of the uniform color mixing packaging device of the present invention. The fifth figure is a schematic diagram of the shape of the surface structure of the color mixing unit of the uniform color mixing packaging device according to the present invention. FIG. 5A is a cone shape, FIG. 5B is a truncated cone, FIG. 5C is a pyramid type, and FIG. 5D is a truncated pyramid. Figure 5E is an asymmetric pyramid, Figure 5F is a hexagonal pyramid, and Figure 5G is a truncated conical microstructure with curvature. The sixth diagrams A to D are schematic diagrams of the combining units of the uniform color mixing packaging device of the present invention, FIG. 6A is a tenon structure corresponding to a male and female of the combining unit, FIG. 6B is a sliding groove structure, FIGS. 6C and 6D It is a screw-shaped structure and a groove corresponding to two types of male and female. Figure 6E is a schematic diagram of a light source unit and a color mixing unit that are replaced by a combination unit to achieve a module. Figure 6F is an optical design analysis. An analysis of the color mixing unit with RGB Results of various light distribution curves of SMD LED. The seventh figure A is the structural appearance of the TIR-R lens commonly used by LED light sources to collect light. The seventh figure B is the light distribution curve of each color presented by the RGB SMD LED light source under this mode. The light distribution is obviously different. seventh

Page 14 200539473 Brief Description of Drawings Figure C is a light distribution curve diagram of an RGB SMD LED packaged with a conventional traditional spherical mold force, and seventh diagram D is a light distribution curve diagram of a uniform color mixing packaging device of the present invention. Fig. 7E shows a comparison chart of the color difference between the uniform color mixing packaging device of the present invention and the appearance of the TIR-R mold structure on the SMD LED. The eighth figure A is a light distribution curve chart of RGB piranha type LED with red light at 0, 45, 90 and ZENITH angle. The eighth figure B is a light distribution curve chart of a RGB piranha-type LED with a green light of 0 degrees 45 degrees and 90 degrees ZENITH angle. The eighth figure C is a light distribution curve chart of a RGB piranha type LED blue light with a ZENITH angle of 0 degrees, 45 degrees, and 90 degrees. The eighth figure D shows that the original piranha type LED, which is inferior to the original light type, is used as the light source unit and the color mixing unit composed of conical microstructures of different sizes in the present invention is not added to the original piranha type LED. Comparison chart of chromatic aberration of various light sources0

Page 15

Claims (1)

200539473 6. Scope of patent application 1. A mixed-color package with a suitable substrate and a light source unit, including 2 including: and a driving circuit to drive = several light-emitting light sources to move the light-emitting light source; a mixed-color single-light source to generate linear refraction If you apply for a single or you can apply for a special unit, you can apply for a single light source. For example, you apply for a plurality of light sources. Unit II 'Λ contains multiple microstructures on the surface to make the light rays ϋ α ν. After the microstructures of this color mixing unit, most of the light passes through the microstructure 椹 μ Α _ subject, and some of the light is reflected and scattered. . For the light source unit described in item 1A, the light source unit may be a plurality of light source units. Benefit range M 1. M _ The light source unit described in item 1 or item 2 is composed of a plurality of light sources of the same type +% different types. The profit range is 坌. In the light source unit described in item 3, the light source unit can be combined into an array to form an array after the independent packaging is reduced. With the light source unit described in the ^ range item 3, the light source unit can be used at the same time. ^ F The light source unit is a packaged light source unit at the same time. A combination unit is included, and the combination unit fixes the light source unit and the color mixing unit. The mixed color packaging device described in the first item of the scope includes a buffer medium unit in addition to the light color unit. The mixed color packaging device described in Item 5 of the scope of interest includes a buffer unit in addition to the light color mixing unit and a combination unit. 200539473 6. Scope of patent application 9. According to the color mixing package device described in item 7 of the scope of patent application, the material of the buffer medium unit may be composed of gas, liquid, and solid. 10. The buffer medium unit according to item 7 of the scope of the patent application, wherein the buffer medium unit may be composed of a gas. 1 1. The buffer medium unit according to item 7 of the scope of the patent application, the buffer medium unit may be composed of a liquid. 1 2. The buffer medium unit according to item 7 of the scope of the patent application, the buffer medium unit may be composed of a solid. 1 3. According to the buffer medium unit described in item 7 of the scope of the patent application, if the buffer medium unit is composed of a gas, the composition of the gas contains at least one of oxygen, nitrogen, helium, neon, and argon. . 1 4. The bonding unit described in item 6 of the patent application, the actual composition of the bonding unit may be a resin colloid with adhesive force. 1 5. The bonding unit as described in item 6 of the scope of patent application, the actual composition of the bonding unit may be a solid mixture with adhesion and adhesion. 1 6. According to the combination unit described in item 6 of the scope of patent application, the actual composition of the combination unit may be a tenon corresponding to the male and female. 1 7. According to the combination unit described in item 6 of the scope of patent application, the actual composition of the combination unit can be a sliding slot corresponding to the male and female. 1 8. According to the coupling unit described in item 6 of the scope of the patent application, the actual composition of the coupling unit can be a screw-shaped structure and a spiral groove corresponding to the male and female. 1 9. According to the bonding unit described in item 6 of the scope of the patent application, the actual composition of the bonding unit may be a solid mixture with adhesion and adhesion. 2 0. The actual body structure of the color mixing unit described in item 1 of the scope of patent application, Page 17 200539473 6. Scope of patent application The microstructure composition can be conical. 2 1. According to the actual microstructure body of the color mixing unit described in item 1 of the scope of the patent application, the aspect ratio of each single microstructure is about 0.3 ~ 4, and the actual size of its height is 10 ~ 300 Micrometer (um). 2 2. According to the actual ontology structure of the color mixing unit described in item 1 of the scope of the patent application, the microstructure composition may be an asymmetric pyramid. 2 3. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a pentagonal cone. 2 4. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a hexagonal cone. 2 5. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a truncated cone. 2 6. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a truncated asymmetric pyramid. 2 7. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a truncated pentagonal cone. 2 8. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a truncated hexagonal cone. 2 9. According to the actual body structure of the color mixing unit described in item 1 of the scope of the patent application, the composition of the microstructure may be a cone with a truncated curvature. 3 〇. According to the actual body structure of the color mixing unit described in item 1 of the scope of the patent application, the microstructure composition may be an asymmetric pyramid with a truncated curvature. 3 1. According to the actual body structure of the color mixing unit described in item 1 of the scope of the patent application, the composition of the microstructure may be a pentagonal cone with a curvature of a truncated band. Page 18 200539473 VI. Scope of patent application 3 2. As for the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the microstructure composition may be a hexagonal cone with a frustoconical curvature. 3 3. According to the actual body structure of the color mixing unit described in item 1 of the scope of patent application, the composition of the microstructure can be a symmetrical pyramid. 3 4. According to the actual body structure of the color mixing unit described in item 1 of the patent application scope, the microstructure composition may be a truncated symmetrical pyramid. 3 5. The color mixing unit as described in the scope of the patent application · item 1 may have a microstructure composed of a symmetrical pyramid with a truncated curvature. 3 6. The color mixing unit described in item 1 of the scope of patent application, whose microstructure composition may be a single color mixing unit formed by a plurality of microstructures of different sizes or types. Page 19