A multi-color adjustable COB light source and a lamp

Abstract

The invention discloses a multi-color adjustable COB light source, comprising a substrate, fluorescent glue, a solid crystal area limited on the substrate, and a plurality of upright LED chips arranged in the solid crystal area and connected to a circuit on the substrate, wherein a dam is enclosed at the edge of the solid crystal area, and the invention also comprises a plurality of bosses arranged in the solid crystal area, wherein a spacing is provided between two adjacent bosses so as to form a groove between the two adjacent bosses, the upright LED chip is arranged on the upper surface of the boss and in the groove, and the fluorescent glue covers the solid crystal area; when the ratio of the fluorescent glue covered on the boss and in the groove is different, the COB light source can emit light of two colors; when the ratio of the fluorescent glue covered on the boss and in the groove is the same, a upright LED chip with a different light wavelength from that emitted by other upright LED chips in the groove is added to the groove, so that the COB light source can emit light of two colors, and the LED chip adopts an upright manner, and there is no insulating layer on the substrate, so as to have good heat dissipation performance.

Description

Technical Field

[0001] The present invention relates to the field of COB light sources, and in particular to a multi-color adjustable COB light source and a lamp. Background Art

[0002] COB light source is a high-efficiency integrated surface light source technology in which LED chips are directly attached to a high-reflectivity mirror metal substrate. COB light source usually includes a substrate and a dam arranged on the substrate, and the dam has a solid crystal area. In the existing multi-color COB light sources, three areas are usually separated in the solid crystal area, and two adjacent areas are covered with fluorescent glue of different colors, so that the COB light source emits two colors of light. However, since the interval between the two colors of the light emitting areas of the COB light source is large, there will be dark areas in the emitted light. Therefore, some COB light sources divide the solid crystal area into many areas, and set two LED chips with different light wavelengths in two adjacent areas, and then cover the solid crystal area with fluorescent glue of the same color. In this way, multi-color light can be achieved, but since there are too many light emitting areas, it is difficult to divide them into two different areas. The white glue that separates the light-emitting area occupies a large area of ​​the solid crystal area, and the number of LED chips that can be arranged in the solid crystal area of ​​the same size will be greatly reduced. Therefore, only a low-power, multi-color COB light source with good luminous effect can be achieved, but not a high-power one. The market also uses CSP (chip-scale packaging) method, in which one chip is pre-sprayed with the light color required by the terminal application site, and then attached to the substrate in the form of a patch. The other chip uses a conventional wavelength chip plus a little fluorescent powder glue to stimulate the light color required by the terminal application. This method can only use the flip-chip method of LED chips. Since the flip-chip COB light source is also provided with an insulating layer on the substrate, the heat generated during the operation of the LED chip cannot be quickly transferred to the other side of the substrate (thermal and electrical separation cannot be achieved), and there is a defect of poor heat dissipation. In addition, the current domestic production process of CSP chips is not mature, the cost is too high, and it cannot be applied to COB light source manufacturing efficiently and quickly. Based on the above defects, there is an urgent need for a multi-color COB light source that can achieve multi-color light, no dark area, and good heat dissipation performance. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a multi-color adjustable COB light source and a lamp.

[0004] A technical solution adopted by an embodiment of the present invention to solve its technical problems is: a multi-color dimmable COB light source, including a substrate, a fluorescent glue, a solid crystal area defined on the substrate, and a plurality of upright LED chips arranged in the solid crystal area and connected to the circuit on the substrate, the edge of the solid crystal area is surrounded by a dam, and also includes a plurality of bosses arranged in the solid crystal area, there is a spacing between two adjacent bosses to form a groove between the two adjacent bosses, the upright LED chip is arranged on the upper surface of the boss and in the groove, and the fluorescent glue covers the solid crystal area.

[0005] Furthermore, the wavelength of light emitted by the first upright LED chip arranged on the upper surface of the boss is the same as or similar to the wavelength of light emitted by the first upright LED chip arranged in the groove, and the fluorescent glue covering the first upright LED chip on the surface on the boss and the fluorescent glue covering the first upright LED chip in the groove have different ratios.

[0006] Furthermore, the wavelength of light emitted by the first upright LED chip arranged on the upper surface of the boss is the same as or similar to the wavelength of light emitted by the first upright LED chip arranged in the groove, the fluorescent glue on the first upright LED chip covering the surface on the boss and the fluorescent glue on the first upright LED chip covering the groove are in the same ratio and the thickness of the fluorescent glue in the groove is greater than the thickness of the fluorescent glue on the boss, and a second upright LED chip emitting light of a different wavelength from that of the first upright LED chip is also arranged in the groove.

[0007] Furthermore, the wavelength of light emitted by the first front-mounted LED chip is 440-470 nm, and the wavelength of light emitted by the second front-mounted LED chip is 610-630 nm.

[0008] Furthermore, the height of the boss is set to 0.15-0.35 mm.

[0009] Furthermore, the boss is formed by etching the crystal bonding region.

[0010] Further, the substrate is made of copper.

[0011] A lamp comprises the multi-color COB light source.

[0012] The beneficial effects of the present invention include: a multi-color adjustable light COB light source, comprising a substrate, fluorescent glue, a solid crystal area defined on the substrate, and a plurality of upright LED chips arranged in the solid crystal area and connected to the circuit on the substrate, the edge of the solid crystal area is surrounded by a dam, and also comprising a plurality of bosses arranged in the solid crystal area, a spacing between two adjacent bosses to form a groove between the two adjacent bosses, the upright LED chip is arranged on the upper surface of the boss and in the groove, and the fluorescent glue covers the solid crystal area; when the ratio of the fluorescent glue covering the boss and the groove is different, the COB light source can emit light of two colors; when the ratio of the fluorescent glue covering the boss and the groove is the same, adding an upright LED chip with a different wavelength from that of the light emitted by other upright LED chips in the groove to the groove can also make the COB light source emit light of multiple colors, and the LED chip adopts an upright manner, there is no insulating layer on the substrate, and the heat dissipation performance is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0014] Figure 1 This is a structural diagram of a multi-color dimmable COB light source. DETAILED DESCRIPTION

[0015] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0016] In the description of the present invention, the meaning of "above", "below", "exceed", etc. is not inclusive of the number itself, and the meaning of "above", "below", "within", etc. is inclusive of the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0017] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0018] In the present invention, unless otherwise clearly defined, the words "set", "install", "connect" and the like should be understood in a broad sense, for example, they can be directly connected or indirectly connected through an intermediate medium; they can be fixedly connected or detachably connected or integrally formed; they can be mechanically connected; they can be the internal connection of two elements or the interaction relationship between two elements. Those skilled in the art can reasonably determine the specific meanings of the above words in the present invention in combination with the specific content of the technical solution.

[0019] Reference Figure 1 A multi-color adjustable COB light source includes a substrate 10, a fluorescent glue, a solid crystal area 20 defined on the substrate 10, and a plurality of upright LED chips arranged in the solid crystal area 20 and connected to the circuit on the substrate 10. The edge of the solid crystal area 20 is surrounded by a dam 30, and also includes a plurality of bosses 40 arranged in the solid crystal area 20. There is a spacing between two adjacent bosses 40 to form a groove 50 between the two adjacent bosses 40. The upright LED chip is arranged on the upper surface of the boss 40 and in the groove 50, and the fluorescent glue covers the solid crystal area 20.

[0020] As the first embodiment of the present invention, the wavelength of light emitted by the first upright LED chip 61 arranged on the upper surface of the boss 40 is the same as or similar to the wavelength of light emitted by the first upright LED chip 61 arranged in the groove 50, and the fluorescent glue covering the first upright LED chip 61 on the surface of the boss 40 and the fluorescent glue covering the first upright LED chip 61 in the groove 50 have different ratios; the principle is as follows: since the ratios of the fluorescent glue covering the boss 40 and the groove 50 are different, that is, secondary glue dispensing, it is only necessary to arrange the first LED chip 61 capable of emitting light of the same wavelength in the boss 40 and the groove 50. The light emitted by the first LED chip 61 on the boss 40 passes through the fluorescent glue covering the boss 40 to form light of one color, and the light emitted by the first LED chip 61 in the groove 50 passes through the fluorescent glue covering the groove 50 to form light of another color, and by changing the current size, the COB light source is made into a multi-color COB light; furthermore, due to the height difference between the boss 40 and the groove 50, when the glue is dispensed in the groove 50 for the first time, since the fluorescent glue has fluidity, the existence of the height difference will not allow the fluorescent glue at the first dispensing to flow into the fluorescent glue at the second dispensing, so that the two different colors of fluorescent glue are separated.

[0021] As a second embodiment of the present invention, the wavelength of light emitted by the first upright LED chip 61 arranged on the upper surface of the boss 40 is the same as or similar to the wavelength of light emitted by the first upright LED chip 61 arranged in the groove 50, the fluorescent glue on the first upright LED chip 61 covering the surface on the boss 40 is the same as the fluorescent glue on the first upright LED chip 61 covering the groove 50, and the thickness of the fluorescent glue in the groove 50 is greater than the thickness of the fluorescent glue on the boss 40, and a second upright LED chip 62 with a different wavelength from the first upright LED chip 61 is also arranged in the groove 50; the principle is as follows, when the area of ​​the solid crystal area 20 is small, due to process limitations, the solid crystal area 20 can only be covered with the same ratio of fluorescent glue, that is, glue is dispensed once. At this time, due to the height difference between the boss 40 and the groove 50, the thickness of the fluorescent glue covering the boss 40 is different from the thickness of the fluorescent glue covering the groove 50. Therefore, although the boss The first upright LED chip 61 capable of emitting light of the same or similar wavelength is arranged on the platform 40 and in the groove 50. Due to the difference in thickness of the fluorescent glue, it can also emit light of two different colors. However, since the first upright LED chip 61 is usually a blue LED chip with a wavelength between 440-470nm, and the difference in thickness of the fluorescent glue can also allow the COB light source to emit two colors of light, the amplitude of dimming and the color change of dimming are not very large, and there are defects during use. Therefore, a red LED chip with a wavelength between 610-630nm, that is, a second upright LED chip 62, is arranged in the groove 50, which can compensate for the light emitted by the first upright LED chip 61 in the groove 50, so that the multi-color light dimming effect of the COB light source is better; the LED chips can be lit up individually or at the same time, and when lit at the same time, different light colors are generated by adjusting the current size, thereby achieving a multi-color light adjustment effect.

[0022] Reference Figure 1 In the present invention, the number of bosses 40 is preferably 4, including 2 first bosses and 2 second bosses. The two first bosses are separated on both sides of the solid crystal area 20, and the two second bosses are arranged on a straight line perpendicular to the line connecting the two first bosses. There is also a spacing between the two second bosses, and the first upright LED chip 61 and / or the second LED chip 62 are also arranged in the spacing. The wavelength of light emitted by the first upright LED chip 61 is 440-470nm, and the wavelength of light emitted by the second upright LED chip 62 is 610-630nm.

[0023] The height of the boss 40 is set to 0.15-0.35mm; the height of the boss 40 cannot be too high, otherwise the light emitted by the first upright LED chip 61 or the second upright LED chip 62 in the groove 50 will be blocked by the boss 40, the lighting effect is poor, and a dark area may also be formed; the height of the boss 40 cannot be too low, otherwise the height difference between the boss 40 and the groove 50 is insufficient, and the thickness difference between the fluorescent glue on the first upright LED chip 61 on the boss 40 and the fluorescent glue on the first upright LED chip 61 in the groove 50 is insufficient, and the light color that can be formed is not obvious.

[0024] The boss 40 is formed by etching the die-bonding region 20 .

[0025] The substrate 10 is made of copper; since the first upright LED chip 61 and the second LED chip 62 are upright chips, there is no insulating layer on the substrate 10, and the heat generated by the first upright LED chip 61 and the second LED chip 62 can be quickly transferred to the side of the substrate 10 away from the first upright LED chip 61 and the second LED chip 62, which is convenient for heat dissipation. Furthermore, the use of metal copper with very good thermal conductivity can make heat conduction faster and the heat dissipation performance is better.

[0026] A lamp comprises the multi-color dimmable COB light source.

[0027] Of course, the present invention is not limited to the above-mentioned embodiments, and those skilled in the art may make equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications and substitutions are all included in the scope defined by the claims of this application.

Claims

1. A multi-color adjustable COB light source, comprising a substrate (10), a fluorescent glue, a crystal-bonding area (20) defined on the substrate (10), and a plurality of upright LED chips arranged in the crystal-bonding area (20) and connected to a circuit on the substrate (10), wherein a dam (30) is enclosed at the edge of the crystal-bonding area (20), characterized in that: It also includes a plurality of bosses (40) arranged in the crystal-fixing area (20), a spacing being provided between two adjacent bosses (40) so as to form a groove (50) between the two adjacent bosses (40), the front-mounted LED chip being arranged on the upper surface of the bosses (40) and in the groove (50), and the fluorescent glue covering the crystal-fixing area (20); The wavelength of light emitted by the first upright LED chip (61) arranged on the upper surface of the boss (40) is the same as or similar to the wavelength of light emitted by the first upright LED chip (61) arranged in the groove (50); the color of the fluorescent glue on the first upright LED chip (61) covering the surface on the boss (40) is the same as the ratio of the fluorescent glue on the first upright LED chip (61) covering the groove (50), and the thickness of the fluorescent glue in the groove (50) is greater than the thickness of the fluorescent glue on the boss (40); a second upright LED chip (62) emitting light of a different wavelength from that of the first upright LED chip (61) is also arranged in the groove (50); and the first upright LED chip (61) is set as a blue light LED chip.

2. The multi-color adjustable COB light source according to claim 1, characterized in that: The wavelength of the light emitted by the first front-mounted LED chip (61) is 440-470 nm, and the wavelength of the light emitted by the second front-mounted LED chip (62) is 610-630 nm.

3. A multi-color adjustable COB light source according to any one of claims 1-2, characterized in that: The height of the boss (40) is set to 0.15-0.35 mm.

4. A multi-color adjustable COB light source according to any one of claims 1-2, characterized in that: The boss (40) is formed by etching the crystal fixing area (20).

5. A multi-color adjustable COB light source according to any one of claims 1-2, characterized in that: The substrate (10) is made of copper.

6. A lamp, comprising the multi-color dimmable COB light source according to any one of claims 1 to 5.

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