TWI232001B - 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

1232001 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 device module, which can conveniently adjust the light distribution angle of the light source unit and improve the uniformity of color mixing and reduce the overall light source. Uniform color mixing packaging device for color difference. [Previous technology] With the current production method of white light emitting diodes (LEDs), the most common technology is to use blue or ultraviolet light emitting diodes and fluorescent powders to mix to produce white light, but this method is due to fluorescent light. The conversion efficiency of the powder itself is not good, so the efficiency of white LEDs produced by this method is not good, and the white LEDs that use blue light to excite phosphors are generally poor in color rendering. The white light LEDs achieved by phosphor excitation are the basic patents of NICHI A in Japan 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 1232001 V. Description of the invention (2) 隹 Degree and the white point can be adjusted on this day. And these are the techniques that cannot be achieved by the way of phosphor powder to get this color. However, due to the use of multiple LED square shirts, Muli has encountered the bottleneck of uniform color mixing, so there are fewer such products on the market. At present, the conventional technology is to use traditional packaging methods (cannonball-type packaging) to package RGB three-color chips into full-color RGB LEDs. For example, the technology used in patent number US5 2 6 6 8 1 7 uses three die in a bowl After reflection inside the cup, the light is focused, but this patent uses the effect of the shell-type package to focus the light. According to the principle of imaging in geometrical optics, it can be found that after optical simulation analysis and actual experimental measurement, 'finally seen on the observed imaging surface The light spots of each color will be separated separately. Therefore, such RGB [ED cannot form uniform white light, and the whole will not completely overlap, and the distribution of the color coordinates of the mixed colors will not be uniform, so the overall color mixing The latter chromatic aberration will be very large. This is a common shortcoming when many RGB chips on the market are packaged into white LEDs in the traditional way and their colors are very uneven. The patent number ϋ S 5 8 4 1 1 7 7 This patent has improved the poor uniformity of rg BLED 'because it still uses the traditional mold design (M 〇 1 ding) design method, so it emphasizes the directivity of its light source while The light source uniformity is also lost. 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 structure of this microstructure, the single-zead surface-adhesive LED (SMD LED) can increase the optical efficiency of the light emitted by the chip, but it does not mention how to improve the uniformity of the light source color when multi-die packaging. And its seal

1232001 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 are also 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 Lambertion 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 (Intensity) presents a cosine function Variety. 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 1232001 V. Description of the invention (4) Uniform, using this 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 easier to see the space and angle separation of each color when directly imaging on the retina. The present invention provides a light source device that effectively reduces the color difference distribution after light mixing. The principle is to achieve the light mixing mechanism by 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, and the light can pass through The reflection cup of LED is reused and collected 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. After the reduction, the chromatic aberration of the LED light source will not only increase within the viewing angle of the human eye, it will also be reduced 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.

I [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 1232001 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 c ΐ ive 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-emitting 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 (0LED, 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 fixed, bonded, or bonded with resin through F 1 ipchip. After bonding, 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. And cooperate with suitable heat sink substrate

Page 9 1232001 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 1232001 V. Description of the invention (7)

Injection molding and other methods are made at the same time to achieve the convenience of future module integration. 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 relative stages, which are fixed by directly locking the tongues to each other. Or, as shown in Figure 6B, the sliding slot can be replaced in a similar manner to the 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 resin mixture 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 presence of the operator, the light source unit and the color mixing Unit = media unit. 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. After the different color mixing units are led by the same type of SMD led, the result of the matching curve is generated. In Fig. 6F, the horizontal coordinate unit is the angle, and the vertical coordinate is the relative intensity. The uniform light mixing and sealing device of the present invention has excellent light collecting ability: I can be controlled by design. Figure 7 shows the appearance of a special mold force. This kind of mold power is famous for its high efficiency and high light concentration. If this mold power is used in combination with general SMD RGB LEDs, the figure is an experimental RGB three-crystal. The light distribution curve of each grain can be seen in the three colors. The angle difference is actually quite large. The X color " ^ 差 ^^ 十 77 tube is based on the UV of CIE 1 9 64. Calculated by coordinates, you can measure the cheek spectrum and intensity to 5 ^

1232001 V. Description of the invention (8) Calculate the result of the difference and use the zero degree of the optical axis as the reference to calculate the relative color difference of each angle. 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, the result of uneven color mixing can still be seen / eyes separated. 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 curve of RGB almost overlaps, and represents the angle of each color of RGB. The distribution is almost exactly 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 curves of the red light piranha LED at various ZENITH angles of 0, 45, and 90 degrees Figure 8B shows the light distribution curves of the green light chip at the ZENITH angle of 0 degrees, 45 degrees, and 90 degrees, and Figure 8C shows the light distribution curves 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, the color difference (de 11 a UV) that the human eye can't distinguish is about 0. 0 0 8 or less,

Page 12 1232001 V. Description of the invention (9) The color difference of the LEDs packaged by this piranha is more than about 0.30, so the eyes can easily see the unevenness of the color separation, so it is often seen on the market. These piranha-type RGB LED products have such disadvantages. Finally, please refer to FIG. 8D, which shows that the piranha type LED, which is originally poor in light type, is used as the light source unit, and then mixed with the color mixing mouth composed of conical microstructures of different sizes in the present invention. Comparison chart of color difference of various light sources when man-made LED, without adding 'unit'. It can be seen that the color difference of the uniform color mixing device of the present invention is significantly reduced1 and it is understood from the above experimental verification. The invention-the uniform color mixing packaging device has the advantages of effectively reducing the color difference and also appropriately modifying the light type. 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. However, the above are only the preferred embodiments of the present invention, and any changes made according to the present invention should still be included in the scope of the 'patent' 〇No. Zhao ,,,,,] 1 LED mold force 2 RGB LED chip 3 Wire 4 Reflective cup 5 Color mixing unit 6 Combination unit 7 Light source unit 8 Micro structure 9 Tenon structure 10 Slot structure 11 Thread groove structure 12 Micro structure Body 13 Bracket 14 Light ❶

Page 13 1232001 Brief description of the drawings The first picture A and the first picture B are the traditional RGB multi-die LED mixed color 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 the light source unit and the color mixing unit through the combination unit replacement module, Figure 6F is an optical design analysis of the color mixing unit with RGB SMD LED Results of various light distribution curves. 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 1232001 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. The seventh figure D is a light distribution curve 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 a piranha-type LED of RGB with a red light of 0 degrees, 45 degrees, and a 90 degree ZENITH angle. The eighth figure B is a light distribution curve chart of the R G B piranha type L E D green light with a ZENITH angle of 0 degrees 4 5 degrees 90 degrees. 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

Claims (1)

1232001 6. Scope of patent application1. A mixed-color packaging device, ^. With a suitable substrate and a light source unit, including Fuxu 3, and a driving circuit to drive the frequency-emitting light ^ knife ^ first light source; χ3 × 3 light generated early The penetrating micro-patent model can be a compound patent model and can be a similar patent model. Patent fan light emitting patent fan mixed color single connection fixed patent fan, mixed patent fan, mixed color element 0-mixed light source production line refraction 2 · if applying for a single or 3 · if the application element can be 4 · if the application is a plurality of light sources 5 · if applying The number is 6. If you apply for a unit, you can connect 7 · If you apply for a source unit 8 · If you apply for a source unit Medium M One surface contains a plurality of microstructures, and most of the luminous lines pass through the microstructures of the color mixing unit. Light, structure, and part of the light are reflected and scattered. For the light source unit described in item 1, there may be several light source units. The light source unit described in item 1 or item 2 is composed of a plurality of light sources of different types. The light source unit described in item 3, the light source unit can be independently packaged and then combined to form an array of light source units. The light source unit described in item 3 is packaged together and the light sources are packaged together to surround the first item. The color mixing and packaging device is except package 80 and 70. Yuanwai includes a community of people-^ 3 Guanglu, Wai, Ran 0 3,, and 0 together, and the light source unit and color mixing unit. 〇 Early Yuan The mixed color packaging device described in item 1 above, in addition to the unit, also contains a buffer medium sheet, Yuan ^. 3 Light ^ The Kun-Kun packaging device described in item 5 ', in addition to light, in addition to the early element, ... 1232001 6. Scope of patent application 9. The color mixing package device described in item 7 of the scope of patent application, the material of the buffer medium unit can 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 as described in item 7 of the scope of 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 〇. The actual body structure of the color mixing unit described in item 1 of the scope of patent application, Page 17 1232001 VI. Scope of patent application The composition of its microstructure can be conical. 2 1. According to the actual microstructure body of the color mixing unit described in item 1 of the scope of patent application, the aspect ratio of each single microstructure is from about 0.3 to 4, and the actual size of its height is 10 ~ 300 micron (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. 30. 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 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 1232001 VI. Scope of patent application 3 2. 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 with a truncated 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. According to the color mixing unit described in item 1 of the patent application scope, the composition of the microstructure may be a symmetrical pyramid with a frustoconical 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. I Page 19