CN112268237B - Multi-primary-color facula-free flexible lamp strip - Google Patents
Multi-primary-color facula-free flexible lamp strip Download PDFInfo
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- CN112268237B CN112268237B CN202011124722.XA CN202011124722A CN112268237B CN 112268237 B CN112268237 B CN 112268237B CN 202011124722 A CN202011124722 A CN 202011124722A CN 112268237 B CN112268237 B CN 112268237B
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- flexible substrate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S4/00—Lighting devices or systems using a string or strip of light sources
- F21S4/20—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports
- F21S4/22—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape
- F21S4/24—Lighting devices or systems using a string or strip of light sources with light sources held by or within elongate supports flexible or deformable, e.g. into a curved shape of ribbon or tape form, e.g. LED tapes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
- F21S10/00—Lighting devices or systems producing a varying lighting effect
- F21S10/02—Lighting devices or systems producing a varying lighting effect changing colors
- F21S10/023—Lighting devices or systems producing a varying lighting effect changing colors by selectively switching fixed light sources
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V19/00—Fastening of light sources or lamp holders
- F21V19/001—Fastening of light sources or lamp holders the light sources being semiconductors devices, e.g. LEDs
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V23/00—Arrangement of electric circuit elements in or on lighting devices
- F21V23/003—Arrangement of electric circuit elements in or on lighting devices the elements being electronics drivers or controllers for operating the light source, e.g. for a LED array
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B45/00—Circuit arrangements for operating light-emitting diodes [LED]
- H05B45/20—Controlling the colour of the light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
Abstract
The invention provides a multi-primary color facula-free flexible lamp strip, which comprises: the LED chip packaging structure comprises a flexible substrate and a multi-primary-color LED chip set, wherein the central area of the flexible substrate is arranged into a chip placing area, and LED chips of the multi-primary-color LED chip set are arranged in the chip placing area according to a preset arrangement sequence; the flexible substrate comprises a front surface and a back surface, wherein two sides of the front surface and the back surface of the flexible substrate are respectively provided with an interval line, the interval lines on the front surface are connected with the interval lines on the back surface through conductive counter bores, the number of the interval lines is 1 larger than that of primary colors of the multi-primary-color LED chip sets, conductive circuits are prefabricated on the back surface of the flexible substrate, and the conductive circuits are electrically connected with the interval lines; the current is adjusted through the spacing line corresponding to each primary color in the multi-primary-color LED chip set so as to achieve the dimming and color mixing effects. The invention can effectively increase the electric conduction area and the heat conduction area, reduce the pressure difference of the lamp strip, realize low heat value resistance, and has high reliability, high flexibility and long service life.
Description
Technical Field
The invention relates to a flexible lamp strip, in particular to a multi-primary-color facula-free flexible lamp strip.
Background
The LED is widely used as a fourth generation green lighting source, and the market of the LED flexible light bar as a product that can be randomly bent and attached is highly increased in recent years, wherein the dimmable flexible light bar product is popular with the market due to the advantages of good light type, easy design and the like. The light source with adjustable light can be used in special occasions with adjustable color temperature, such as markets, counters, coffee shops and the like. The LED lamp can be used for dimming and mixing colors, has multiple functions, and can be arranged at the front end of the LED lighting in the comprehensive intelligent direction. The existing packaging method for achieving the light source effect mainly adopts an external SMD device combination circuit or realizes the light source effect through a parallel colloid packaging technology at the same circuit point, and the method adopts an intensive forward-mounted SMD interval arrangement mode, so that the gold wire connection reliability is low, the light emitting is in a point shape, the light shape is poor, the reliability is low, and the defects of inconsistent light color (yin-yang color phenomenon), poor dimming effect and the like exist.
Disclosure of Invention
The invention aims to solve the technical problem of providing a multi-primary color spot-free flexible lamp strip which is low in thermal resistance, high in reliability and long in service life and provides a good hardware basis for improving the dimming effect of the lamp strip.
To this end, the present invention provides a multi-primary color non-light spot flexible light strip, comprising: the LED chip packaging structure comprises a flexible substrate and a multi-primary-color LED chip set, wherein the central area of the flexible substrate is set to be a chip placing area, and LED chips of the multi-primary-color LED chip set are arranged in the chip placing area according to a preset arrangement sequence; the flexible substrate comprises a front surface and a back surface, wherein two sides of the front surface and the back surface of the flexible substrate are respectively provided with an interval line, the interval lines on the front surface are connected with the interval lines on the back surface through conductive counter bores, the number of the interval lines is 1 larger than that of primary colors of the multi-primary-color LED chip sets, conductive circuits are prefabricated on the back surface of the flexible substrate, and the conductive circuits are electrically connected with the interval lines; the current is adjusted through the interval circuit corresponding to each primary color in the multi-primary-color LED chip set so as to achieve the dimming and toning effects.
The invention has the further improvement that the multi-primary-color LED chip set is a three-primary-color LED chip set comprising a red LED chip, a green LED chip and a blue LED chip, four spaced lines are arranged on two sides of the flexible substrate, and the four spaced lines are uniformly arranged in a staggered manner according to straight lines.
The invention has the further improvement that the four-way interval lines comprise a common positive electrode circuit, a red light negative electrode circuit, a green light negative electrode circuit and a blue light negative electrode circuit, each circuit interval line is provided with a circuit node, and each pair of circuit nodes is respectively connected with the positive electrode and the negative electrode of the flip chip LED chip group in the three primary color LED chip group.
A further improvement of the invention is that the spacing circuit for each primary color is controlled individually to achieve individual lighting of the multi-primary LED chip sets.
The invention is further improved in that the front surface of the flexible substrate is also provided with a red light current-limiting resistor, a green light current-limiting resistor and a blue light current-limiting resistor, wherein the red light current-limiting resistor is connected with the red light cathode circuit, the green light current-limiting resistor is connected with the green light cathode circuit, and the blue light current-limiting resistor is connected with the blue light cathode circuit.
The invention has the further improvement that the number of the red light current-limiting resistors is two or more.
The invention has the further improvement that the red light LED chip, the green light LED chip and the blue light LED chip are all flip chips, and the bottoms of the flip chips are fixed in the chip placement area through bonding pads.
The invention has the further improvement that a white cofferdam is arranged at the periphery of the red LED chip.
The invention is further improved in that the conductive circuit is provided with a series-parallel hole, a plurality of LED chips in one conductive circuit are mutually connected in parallel, and a plurality of conductive circuits of each primary color are connected in series through the series-parallel holes.
The invention is further improved in that an adhesive sealing layer added with titanium dioxide white particle powder is arranged above the flexible substrate and the multi-primary LED chip group.
Compared with the prior art, the invention has the beneficial effects that: the flexible lamp strip comprises a flexible substrate, a plurality of primary colors LED chip sets, a plurality of common anodes or common cathodes, a plurality of conductive counter bores and a plurality of interval lines, wherein the flexible substrate is provided with the front side and the back side, the front side and the back side are both provided with the interval lines, the number of the interval lines is 1 larger than that of the primary colors of the multi-primary color LED chip sets, so that the common anodes or common cathodes of the multi-primary color facula-free flexible lamp strip are designed, the conductive area and the heat conductive area can be effectively increased, the pressure difference of the lamp strip is reduced, and the effect of low heat resistance is realized; on the basis, the conductive circuit is prefabricated on the back surface of the flexible substrate and is electrically connected with the spacing circuit, so that a good hardware foundation can be provided for dimming and toning.
Drawings
FIG. 1 is a schematic front view of an embodiment of the present invention;
FIG. 2 is a schematic diagram of a backside structure of an embodiment of the present invention;
fig. 3 is a front partially enlarged structural diagram of an embodiment of the present invention.
Detailed Description
Preferred embodiments of the present invention will be described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 to 3, this example provides a multi-primary color non-speckle flexible light strip, including: the LED chip packaging structure comprises a flexible substrate 1 and a multi-primary-color LED chip set, wherein the central area of the flexible substrate 1 is set as a chip placing area 101, and LED chips of the multi-primary-color LED chip set are arranged in the chip placing area 101 according to a preset arrangement sequence; the flexible substrate comprises a flexible substrate 1 and is characterized in that two sides of the front surface and the back surface of the flexible substrate are respectively provided with a spacing line, the spacing lines on the front surface are connected with the spacing lines on the back surface through conductive counter bores, the number of the spacing lines is 1 greater than that of primary colors of a multi-primary-color LED chip set, conductive circuits 7 are prefabricated on the back surface of the flexible substrate 1, and the conductive circuits 7 are electrically connected with the spacing lines; the current regulation is carried out on the spacing line corresponding to each primary color in the multi-primary-color LED chip set to achieve the dimming and color mixing effects, and the current regulation process is as follows: the current of the interval lines is increased or reduced through the common anode and the three interval lines (namely the common anode circuit 5, the green cathode circuit 302, the red cathode circuit 202 and the blue cathode circuit 402), the light radiation intensity of RGB (red, green and blue) three primary colors is adjusted through adjusting the current, and any color can be formed according to the three primary color toning principle through different light radiation intensities of the three primary colors, so that the dimming and toning effects are achieved; the current of each interval line can be set and adjusted in a user-defined mode according to actual conditions and requirements.
The LED chip set of this embodiment is a multi-primary-color LED chip set, and preferably, as shown in fig. 1 to 3, the multi-primary-color LED chip set is a three-primary-color LED chip set including a red LED chip 201, a green LED chip 301, and a blue LED chip 401, four lines of spacing lines are disposed on both sides of the front surface and the back surface of the flexible substrate 1, and the four lines of spacing lines are uniformly arranged in a staggered manner according to a straight line. In practical application, the multi-primary-color LED chip set may be an LED chip set of two primary colors, or an LED chip set of four primary colors or other multi-primary colors, and this example takes a three-primary-color LED chip set as an example.
The tricolor LED chip set comprises a plurality of groups of red LED chips 201, green LED chips 301 and blue LED chips 401 which respectively form a chip set; the flexible substrate 1 (FPCB flexible substrate) is preferably 10mm wide, is provided with a positive layer and a negative layer, and is divided into four parts of lines/circuits through a structural design of interval separation, the four parts of lines are four interval lines, namely the interval lines refer to lines which are distributed at intervals, the interval lines respectively comprise a common positive electrode circuit 5, a red light negative electrode circuit 202, a green light negative electrode circuit 302 and a blue light negative electrode circuit 402 which share four interval lines, the bottom of the interval lines is etched to form a conducting circuit 7 through prefabrication and is conducted through a plurality of conducting counter bores, the conducting counter bores comprise a red light counter bore 204, a positive electrode counter bore 6, a green light counter bore 304 and a blue light counter bore 404, so that the interval lines on the front side and the interval lines on the back side of the same primary color can be conveniently connected together, in the four interval lines, three red light LED chips 201, green light LED chips 301 and blue light LED chips 401 share three positive electrodes, a circuit is arranged for each color/each primary color of the cathode, all chips are arranged at the center of the flexible substrate 1 (FPCB flexible substrate) and are arranged in a straight line, and light of various colors can be adjusted by mixing the chips through current adjustment of four lines at intervals, so that the dimming and color mixing effects are achieved; each circuit node is provided with a plurality of pairs of circuit nodes, and the circuit nodes are distributed and connected in a counter bore mode through the front part and the back part of circuits according to the circuit circulation conduction requirements; each pair of circuit nodes is respectively connected with the anode and the cathode of a flip chip LED chip group in the three-primary-color LED chip group, so that the LED chips of various primary colors can be respectively connected with the anode and cathode circuits thereof, and four spaced circuits can be independently or respectively lightened; the four lines are uniformly arranged in a staggered manner according to straight lines, so that color crosstalk after lighting is avoided. Therefore, the present embodiment can individually control the spacing lines of each primary color to realize the individual lighting of the multi-primary color LED chip set.
As shown in fig. 1 and fig. 2, the four spaced lines described in this example are distributed from top to bottom as a green negative electrode circuit 302, a common positive electrode circuit 5, a red negative electrode circuit 202, and a blue negative electrode circuit 402, and correspondingly, the circuit pads thereof are a green pad 305, a common positive pad 8 (or a common negative electrode pad), a red pad 205, and a blue pad 405 in sequence.
The preset arrangement sequence in this embodiment is preferably an arrangement sequence of the red LED chip 201, the green LED chip 301, the blue LED chip 401, the red LED chip 201, the green LED chip 301, and the blue LED chip 401 … …, that is, the arrangement sequences are sequentially arranged, and in practical application, other arrangement sequences may be adopted to meet different requirements. The green LED chip 301 and the blue LED chip 401 preferably emit light directly, the red LED chip 201 preferably excites a red phosphor process, a white cofferdam is arranged on the periphery of the red LED chip 201 and is arranged between the red LED chip 201 and other LED chips, particularly between the red LED chip 201 and the blue LED chip 401, so as to realize a shielding effect; by the design, the problem of color cross caused by secondary excitation of the fluorescent powder corresponding to the red LED chip 201 by the blue LED chip 401 in the high-color-temperature lighting process can be effectively avoided, the light color effect of the product after dimming and color mixing is not affected, the dimming and color mixing effects are better, and the design without light spots is realized in a real sense.
The tricolor LED chip set is preferably fixed in a circuit on a flexible substrate 1 (FPCB flexible substrate) in equal distribution through solder paste/bonding pads to increase the stability of the tricolor LED chip set, the preferable arrangement is sequentially circulated according to the R \ G \ B sequence, four spaced circuits of the flexible substrate 1 are filled with colloid/packaging glue covering the chip set, namely, a sealing glue layer added with titanium dioxide white particle powder is arranged above the flexible substrate 1 and the multi-primary LED chip set, the titanium dioxide white particle powder filled in the sealing glue layer can effectively increase the light diffusion uniformity, the colloid refractive index can be effectively improved to increase the brightness, the product attractiveness is improved, and the heat resistance is more than 260 ℃.
The positive and negative electrodes of the LED tricolor chip set and the LED tricolor chip set described in this example are connected by a prefabricated conductive line 7, as shown in detail in fig. 2. The LED chip group comprises a plurality of LED flip chips, the LED flip chips are electrically connected, preferably, the red LED chip 201, the green LED chip 301 and the blue LED chip 401 are all flip chips, and the bottoms of the flip chips are fixed in the chip placement area 101 through bonding pads; LED flip chips at four ends of the four LED chip circuits are respectively connected with prefabricated line conductors at four ends of the carrier, and a milky-white sealant layer filled with titanium dioxide nano powder is added, wherein the sealant layer is coated on the peripheries of the flexible substrate 1 and the tricolor LED chip sets; the tricolor LED chip groups of the LED light source are connected in a mode of prefabricating the conducting circuit 7, so that the connection stability and firmness are improved, the whole structure is uniform and attractive, the manufacture is convenient, the LED chip is inverted and the flexible substrate 1 with high heat conductivity is adopted, the gold thread-free design is adopted, the influence of expansion of packaging glue on the reliability of the product due to cold and heat changes is avoided, and the product has the flexibility and the capability of being bent at will.
As shown in fig. 1 and fig. 3, the front surface of the flexible substrate 1 of this embodiment is further provided with a red light current-limiting resistor 203, a green light current-limiting resistor 303, and a blue light current-limiting resistor 403, where the red light current-limiting resistor 203 is connected to the red light cathode circuit 202, the green light current-limiting resistor 303 is connected to the green light cathode circuit 302, and the blue light current-limiting resistor 403 is connected to the blue light cathode circuit 402, so as to achieve a current-limiting protection effect. It should be noted that, as shown in fig. 3, only one green current-limiting resistor 303 and one blue current-limiting resistor 403 are needed, but the voltage ratio of the red LED chip 201 is relatively low, and the resistance power of the red LED chip may not be enough to affect the stable operation of the circuit, because the number of the red current-limiting resistors 203 is two or more based on the requirement of the resistance power, as shown in fig. 1, such a design can well improve the stability of the product.
As shown in fig. 2 and fig. 3, in this embodiment, the conductive traces 7 are provided with serial-parallel holes, which are connection holes for implementing serial and parallel connection of circuits, and more specifically, a plurality of LED chips in the same conductive trace 7 are connected in series and then externally connected in parallel, that is, a plurality of LED chips in one conductive trace 7 are connected in parallel, and a plurality of conductive traces 7 of each primary color are connected in series through the serial-parallel holes; specifically, the series-parallel holes include a red series-parallel hole 206, a green series-parallel hole 306, and a blue series-parallel hole 406, and the plurality of conductive traces 7 of each primary color are connected through their corresponding series-parallel holes. The reason for the design is that the lamp string can be prevented from being out of service when one or more LED chips are in fault, so that the reliability of the product can be further improved, and the service life of the product can be prolonged.
To sum up, the two sides of the front surface and the back surface of the flexible substrate 1 are both provided with the spacing lines, the spacing lines on the front surface are connected with the spacing lines on the back surface through the conductive counter bores, the number of the spacing lines is 1 greater than that of the primary colors of the multi-primary color LED chip sets, so that the common anode or common cathode design of the multi-primary color facula-free flexible lamp strip is realized, the conductive area and the heat conduction area can be effectively increased, the pressure difference of the lamp strip is reduced, and the effect of low heat resistance is realized; on the basis, the conducting circuit 7 is prefabricated on the back surface of the flexible substrate 1 and is electrically connected with the spacing circuit, so that a good hardware foundation can be provided for dimming and color mixing.
The foregoing is a further detailed description of the invention in connection with specific preferred embodiments and it is not intended to limit the invention to the specific embodiments described. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (7)
1. A multi-primary no-spot flexible light strip, comprising: the LED chip packaging structure comprises a flexible substrate and a multi-primary-color LED chip set, wherein the central area of the flexible substrate is arranged into a chip placing area, and LED chips of the multi-primary-color LED chip set are arranged in the chip placing area according to a preset arrangement sequence; the flexible substrate is characterized in that two sides of the front surface and the back surface of the flexible substrate are respectively provided with an interval line, the interval lines on the front surface are connected with the interval lines on the back surface through conductive counter bores, the number of the interval lines is 1 greater than that of the primary colors of the multi-primary-color LED chip sets, conductive circuits are prefabricated on the back surface of the flexible substrate, and the conductive circuits are electrically connected with the interval lines; current regulation is carried out on an interval line corresponding to each primary color in the multi-primary-color LED chip set so as to achieve dimming and color mixing effects;
the multi-primary-color LED chip set comprises a red LED chip, a green LED chip and a blue LED chip, four spaced lines are arranged on two sides of the flexible substrate, and the four spaced lines are uniformly distributed in a staggered manner according to a straight line;
the four lines of interval lines are respectively distributed from top to bottom as a green light cathode circuit, a common anode circuit, a red light cathode circuit and a blue light cathode circuit, and circuit pads are a green light pad, a common anode pad, a red light pad and a blue light pad correspondingly;
the green LED chip and the blue LED chip directly emit light, the red LED chip excites red fluorescent powder to emit light, a white cofferdam is arranged on the periphery of the red LED chip, and the white cofferdam is arranged between the red LED chip and other LED chips;
the conductive circuit is provided with a series-parallel hole, a plurality of LED chips in one conductive circuit are mutually connected in parallel, and a plurality of conductive circuits of each primary color are connected in series through the series-parallel hole.
2. The multi-primary-color flexible light strip without light spots according to claim 1, wherein the four spaced lines comprise a common positive electrode circuit, a red negative electrode circuit, a green negative electrode circuit and a blue negative electrode circuit, each spaced line is provided with circuit nodes, and each pair of circuit nodes is respectively connected with a positive electrode and a negative electrode of a flip chip LED chip set in the three-primary-color LED chip set.
3. The multi-primary non-speckle flexible light strip according to claim 1, wherein the spacing lines of each primary color are individually controlled to achieve individual illumination of the multi-primary LED chip sets.
4. The multi-primary color flexible light strip without light spots according to claim 2, wherein a red light current limiting resistor, a green light current limiting resistor and a blue light current limiting resistor are further disposed on the front surface of the flexible substrate, the red light current limiting resistor is connected to the red light cathode circuit, the green light current limiting resistor is connected to the green light cathode circuit, and the blue light current limiting resistor is connected to the blue light cathode circuit.
5. The multi-primary non-speckle flexible light strip according to claim 4, wherein the number of the red current-limiting resistors is two or more.
6. A multi-primary flexible light strip without light spots according to any of claims 1 to 5, characterized in that the red LED chips, the green LED chips and the blue LED chips are flip chips, and the bottoms of the flip chips are fixed on the chip placement area through bonding pads.
7. The multi-primary color non-spot flexible light strip according to any one of claims 1 to 5, wherein an adhesive layer added with titanium dioxide white particles is disposed above the flexible substrate and the multi-primary color LED chip set.
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| CN202011124722.XA CN112268237B (en) | 2020-10-20 | 2020-10-20 | Multi-primary-color facula-free flexible lamp strip |
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| CN202011124722.XA CN112268237B (en) | 2020-10-20 | 2020-10-20 | Multi-primary-color facula-free flexible lamp strip |
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| CN112268237B true CN112268237B (en) | 2022-06-21 |
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| CN116753483A (en) * | 2023-06-28 | 2023-09-15 | 惠州市慧昊光电有限公司 | Multilayer adhesive-coated flexible lamp strip and manufacturing method thereof |
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