Dual-color temperature COB device with variable light-emitting angle

Abstract

The utility model discloses a double color temperature COB device of variable luminous angle relates to COB light source technical field. COB device includes the substrate, and the surface of substrate is provided with first luminous area and second luminous area, first luminous area is provided with first warm color light light emitting module group and first cold color light light emitting module group, and first warm color light light emitting module group includes a plurality of first warm color light light emitting module, and first cold color light light emitting module group includes a plurality of first cold color light light emitting module, second luminous area is provided with second warm color light light emitting module group and second cold color light light emitting module group, and second warm color light light emitting module group includes a plurality of second warm color light light emitting module, and second cold color light light emitting module group includes a plurality of second cold color light light emitting module, and second warm color light light emitting module and second cold color light light emitting module are set up mutually interlaced. The double color temperature COB device of variable luminous angle of the utility model can have the function of variable color temperature and variable luminous angle simultaneously.

Description

Technical Field

[0001] This utility model relates to the field of COB light source technology, and in particular to a dual-color temperature COB device with variable emission angle. Background Technology

[0002] In the field of semiconductor lighting technology, COB (Chip on Board) devices are widely used in commercial lighting, landscape lighting, and special lighting due to their high integration, high brightness, and excellent heat dissipation performance. With the diversification of lighting scenarios, users' functional requirements for light sources have shifted from simple luminous performance to complex functional requirements such as color temperature adjustment and emission angle adjustment. For example, in museum lighting, it is necessary to adjust the warm white light (to highlight texture) or cool white light (to restore color) according to the material of the artifacts, while simultaneously controlling the light projection range to precisely illuminate the exhibits; in commercial window lighting, it is necessary to create different atmospheres through color temperature changes and to achieve focused lighting of key areas through emission angle adjustment. However, existing COB devices face significant technical bottlenecks in terms of functional integration. While some COB devices with color temperature adjustment capabilities have emerged in the market, current COB devices generally only offer single color temperature adjustment and cannot simultaneously adjust the emission angle. Furthermore, traditional COB devices typically rely on external optical components (such as lenses or reflectors) to adjust the emission angle, altering the light emission angle through mechanical structures or optical refraction. This method not only increases the size and weight of the lamp but also reduces light energy utilization due to optical losses. Utility Model Content

[0003] In view of the shortcomings of the prior art, the purpose of this utility model is to propose a dual-color temperature COB device with variable emission angle, which can simultaneously have the functions of changing color temperature and changing emission angle, and the emission angle can be adjusted by changing the size of the emission surface, without relying on external optical components.

[0004] To solve the above-mentioned technical problems, this utility model provides a dual-color temperature COB device with variable emission angle, including a substrate, wherein a first emission area and a second emission area are disposed on the surface of the substrate, and the second emission area surrounds the first emission area. The first light-emitting area is provided with a first warm-color light-emitting module group and a first cool-color light-emitting module group. The first warm-color light-emitting module group includes a plurality of first warm-color light-emitting modules, and the first cool-color light-emitting module group includes a plurality of first cool-color light-emitting modules. The first warm-color light-emitting modules and the first cool-color light-emitting modules are arranged alternately. The second light-emitting area is provided with a second warm-color light-emitting module group and a second cool-color light-emitting module group. The second warm-color light-emitting module group includes a plurality of second warm-color light-emitting modules, and the second cool-color light-emitting module group includes a plurality of second cool-color light-emitting modules. The second warm-color light-emitting modules and the second cool-color light-emitting modules are arranged alternately.

[0005] As an improvement to the above technical solution, the surface of the substrate is further provided with a first warm-color light positive electrode pad, a first warm-color light negative electrode pad, a first cool-color light positive electrode pad, a first cool-color light negative electrode pad, a second warm-color light positive electrode pad, a second warm-color light negative electrode pad, a second cool-color light positive electrode pad, and a second cool-color light negative electrode pad. The positive electrode of the first warm-color light emitting module group is electrically connected to the first warm-color light positive electrode pad, and the negative electrode of the first warm-color light emitting module group is connected to the first warm-color light negative electrode pad. The positive electrode of the first cold color light emission module group is electrically connected to the first cold color light positive electrode pad, and the negative electrode of the first cold color light emission module group is electrically connected to the first cold color light negative electrode pad. The positive electrode of the second warm-color light-emitting module group is electrically connected to the positive electrode pad of the second warm-color light, and the negative electrode of the second warm-color light-emitting module group is electrically connected to the negative electrode pad of the second warm-color light. The positive electrode of the second cold color light emission module group is electrically connected to the positive electrode pad of the second cold color light emission module group, and the negative electrode of the second cold color light emission module group is electrically connected to the negative electrode pad of the second cold color light emission module group.

[0006] As an improvement to the above technical solution, the first warm-colored negative electrode pad and the second warm-colored positive electrode pad are selectively electrically connected. The first cold color light negative electrode pad and the second cold color light positive electrode pad are selectively electrically connected.

[0007] As an improvement to the above technical solution, the first light-emitting area is circular, and the second light-emitting area is annular; The ratio of the ring width of the second light-emitting region to the radius of the first light-emitting region is 1:1.2 to 1:2.5.

[0008] As an improvement to the above technical solution, the distance between the first warm-color light-emitting module and the adjacent first cool-color light-emitting module is smaller than the distance between the second warm-color light-emitting module and the adjacent second cool-color light-emitting module.

[0009] As an improvement to the above technical solution, the color temperature ranges of the first warm-color light emission module and the second warm-color light emission module are 1800K~3500K, respectively.

[0010] As an improvement to the above technical solution, both the first warm-color light emission module and the second warm-color light emission module are low color temperature CSP chips.

[0011] As an improvement to the above technical solution, the color temperature ranges of the first cold color light emission module and the second cold color light emission module are 4500K~7500K, respectively.

[0012] As an improvement to the above technical solution, both the first cold color light emission module and the second cold color light emission module include an LED chip and a phosphor layer, wherein the phosphor layer covers the top of the LED chip; The color temperature range of the fluorescent adhesive layer is 4500K~7500K.

[0013] As an improvement to the above technical solution, the substrate is an aluminum substrate or a ceramic substrate.

[0014] As an improvement to the above technical solution, an encapsulation layer is also included, which is used to cover the first light-emitting area and the second light-emitting area.

[0015] The present invention has the following beneficial effects: By setting a first light-emitting area and a second light-emitting area on a substrate, and by providing a warm-color light-emitting module group (i.e., a first warm-color light-emitting module group and a second warm-color light-emitting module group) and a cool-color light-emitting module group (a first cool-color light-emitting module group and a second cool-color light-emitting module group) in both the first and second light-emitting areas, the color temperature can be changed by controlling the current ratio of the warm-color light-emitting module group and the cool-color light-emitting module group. By controlling the first light-emitting area to emit light alone or the first and second light-emitting areas to emit light simultaneously, the emission angle can be changed due to the change in the size of the emission surface. Thus, the COB device has both color temperature changing function and emission angle changing function, and has broad application prospects.

[0016] Furthermore, by controlling the light emission combination of the first and second light-emitting areas—that is, controlling the first light-emitting area to light up alone or the first and second light-emitting areas to light up together—the light emission angle can be adjusted directly by changing the size of the light-emitting surface without relying on external optical components such as lenses and reflectors. This solves the problems of increased size and weight and high light energy loss caused by the reliance on external structures in traditional COB devices, while also improving integration and adjustment flexibility. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a dual-color temperature COB device with variable emission angle in one embodiment of this utility model; Figure 2 yes Figure 1The diagram shows the current flow of the COB device when it is emitting light in both the first and second light-emitting regions simultaneously. In the figure: substrate 1, first light-emitting area 11, second light-emitting area 12, first warm-color light-emitting module group 2, first cool-color light-emitting module group 3, first warm-color light-emitting module 21, first cool-color light-emitting module 31, second warm-color light-emitting module group 4, second cool-color light-emitting module group 5, second warm-color light-emitting module 41, second cool-color light-emitting module 51, first warm-color light positive electrode pad 61, first warm-color light negative electrode pad 62, first cool-color light positive electrode pad 63, first cool-color light negative electrode pad 64, second warm-color light positive electrode pad 65, second warm-color light negative electrode pad 66, second cool-color light positive electrode pad 67, and second cool-color light negative electrode pad 68. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure of this utility model.

[0019] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figure 1 As shown, this embodiment discloses a dual-color temperature COB device with a variable emission angle, including a substrate 1. The surface of the substrate 1 is provided with a first light-emitting area 11 and a second light-emitting area 12, and the second light-emitting area 12 surrounds the outside of the first light-emitting area 11. The first light-emitting area 11 is provided with a first warm-color light-emitting module group 2 and a first cool-color light-emitting module group 3. The first warm-color light-emitting module group 2 includes a plurality of first warm-color light-emitting modules 21, and the first cool-color light-emitting module group 3 includes a plurality of first cool-color light-emitting modules 31. The first warm-color light-emitting modules 21 and the first cool-color light-emitting modules 31 are arranged alternately, which is beneficial to improving the mixing effect of cool-color light and warm-color light. The second light-emitting area 12 is provided with a second warm-color light-emitting module group 4 and a second cool-color light-emitting module group 5. The second warm-color light-emitting module group 4 includes a plurality of second warm-color light-emitting modules 41, and the second cool-color light-emitting module group 5 includes a plurality of second cool-color light-emitting modules 51. The second warm-color light-emitting modules 41 and the second cool-color light-emitting modules 51 are arranged alternately to improve the mixing effect of cool-color light and warm-color light.

[0022] It is worth noting that this utility model provides a first light-emitting area 11 and a second light-emitting area 12 surrounding it on a substrate 1. Both the first light-emitting area 11 and the second light-emitting area 12 are provided with warm-color light-emitting module groups (i.e., first warm-color light-emitting module group 2 and second warm-color light-emitting module group 4) and cool-color light-emitting module groups (first cool-color light-emitting module group 3 and second cool-color light-emitting module group 5). By controlling the current ratio of the warm-color light-emitting module group and the cool-color light-emitting module group, the function of changing the color temperature can be realized. By controlling the first light-emitting area 11 to emit light alone or the first light-emitting area 11 and the second light-emitting area 12 to emit light simultaneously, the size of the light-emitting surface changes, and the light emission angle can be changed. Thus, the COB device has both color temperature changing function and light emission angle changing function, and has broad application prospects.

[0023] Specifically, the first warm-colored light-emitting module 21 and the first cool-colored light-emitting module 31 in the first light-emitting area 11 are arranged alternately, and the second warm-colored light-emitting module 41 and the second cool-colored light-emitting module 51 in the second light-emitting area 12 are arranged alternately. By adjusting the ratio of warm and cool-colored light current in the first light-emitting area 11 and the second light-emitting area 12 respectively (such as increasing the proportion of warm-colored light current or the proportion of cool-colored light current) through an external driving circuit, light of different color temperatures can be precisely mixed (such as continuously adjusting from warm white light to cool white light), meeting the needs of dynamic color temperature adjustment in scenarios such as highlighting the texture of museum artifacts and creating the atmosphere of commercial window displays, as well as in daily use. The staggered distribution design shortens the light emission path of warm and cool colors through physical layout, improves mixing uniformity, and avoids the light spot color deviation problem caused by traditional regional light emission.

[0024] Based on the structural arrangement of the first light-emitting region 11 and the second light-emitting region 12, when only the first warm-colored light-emitting module group 2 and the first cool-colored light-emitting module group 3 of the first light-emitting region 11 emit light, the light-emitting surface is relatively small. According to optical principles, the light is relatively concentrated, the emission angle is small, and the illuminated area is relatively narrow, forming a narrow-angle focusing effect. However, when the first light-emitting region 11 and the second light-emitting region 12 emit light simultaneously, the light-emitting surface expands into a combination of "first light-emitting region 11 + second light-emitting region 12". The area of ​​the light-emitting surface increases, the light becomes more dispersed, the emission angle increases accordingly, and the illuminated area becomes wider, forming a wide-angle floodlight effect. This design of the present invention allows the COB device to flexibly adjust the emission angle according to different usage requirements to meet the lighting requirements of different scenarios. For example, a smaller emission angle can be used in areas requiring focused lighting, while a larger emission angle can be used in areas requiring large-area uniform lighting. Furthermore, by controlling the light emission combination of the first light-emitting area 11 and the second light-emitting area 12, that is, the first light-emitting area 11 emits light alone, or the first light-emitting area 11 and the second light-emitting area 12 emit light together, the light emission angle can be adjusted directly by changing the size of the light-emitting surface without relying on external optical components such as lenses and reflectors. This solves the problems of increased size and weight and high light energy loss caused by the reliance on external structures in traditional COB devices, while improving integration and adjustment flexibility.

[0025] In one embodiment, a plurality of first warm-color light-emitting modules 21 can be connected together in series or in parallel; a plurality of first cool-color light-emitting modules 31 can be connected together in series or in parallel; a plurality of second warm-color light-emitting modules 41 can be connected together in series or in parallel; and a plurality of second cool-color light-emitting modules 51 can be connected together in series or in parallel.

[0026] It is worth noting that there is no dam between the first luminous area 11 and the second luminous area 12, which allows for better adjustment of the luminous angle.

[0027] In one embodiment, the surface of the substrate 1 is further provided with a first warm-color positive electrode pad 61 (i.e., W1+), a first warm-color negative electrode pad 62 (i.e., W1-), a first cool-color positive electrode pad 63 (i.e., C1+), a first cool-color negative electrode pad 64 (i.e., C1-), a second warm-color positive electrode pad 65 (i.e., W2+), a second warm-color negative electrode pad 66 (i.e., W2-), a second cool-color positive electrode pad 67 (i.e., C2+), and a second cool-color negative electrode pad 68 (i.e., C2-). The positive electrode of the first warm-color light emitting module group 2 is electrically connected to the first warm-color light positive electrode pad 61, and the negative electrode of the first warm-color light emitting module group 2 is connected to the first warm-color light negative electrode pad 62. The positive electrode of the first cold color light emission module group 3 is electrically connected to the first cold color light positive electrode pad 63, and the negative electrode of the first cold color light emission module group 3 is electrically connected to the first cold color light negative electrode pad 64. The positive electrode of the second warm-color light-emitting module group 4 is electrically connected to the second warm-color light positive electrode pad 65, and the negative electrode of the second warm-color light-emitting module group 4 is electrically connected to the second warm-color light negative electrode pad 66. The positive electrode of the second cold color light emission module group 5 is electrically connected to the second cold color light positive electrode pad 67, and the negative electrode of the second cold color light emission module group 5 is electrically connected to the second cold color light negative electrode pad 68.

[0028] By setting eight independent pads (i.e., W1+, W1-, C1+, C1-, W2+, W2-, C2+, C2-) on the surface of substrate 1, the first warm-color light-emitting module 21 and the first cool-color light-emitting module 31 in the first light-emitting area 11, as well as the second warm-color light-emitting module 41 and the second cool-color light-emitting module 51 in the second light-emitting area 12, can be connected to the circuit layer on the substrate through the corresponding pads to form a conductive path. This allows the first warm-color light-emitting module 21, the first cool-color light-emitting module 31, the second warm-color light-emitting module 41, and the second cool-color light-emitting module 51 to receive power, transmit signals, or be grounded. Furthermore, through circuit design, the first light-emitting area 11 can be flexibly controlled to emit light individually, or the first light-emitting area 11 and the second light-emitting area 12 can be controlled to emit light simultaneously, thereby controlling the size of the light-emitting surface; and the current of each light-emitting module can be controlled, thereby achieving color temperature adjustment. The independent pad structure design reduces current crosstalk between modules, ensuring control accuracy during multi-mode switching. It is especially suitable for applications that require rapid switching of lighting scenarios, significantly improving the device's functional expandability and operational flexibility.

[0029] In one embodiment, the first warm-colored light negative electrode pad 62 and the second warm-colored light positive electrode pad 65 are selectively electrically connected, that is, the first warm-colored light negative electrode pad 62 and the second warm-colored light positive electrode pad 65 can be electrically connected or disconnected, so that the first warm-colored light emitting module group 2 can emit light independently, or the first warm-colored light emitting module group 2 and the second warm-colored light emitting module group 4 can emit light simultaneously; specifically, a switch can be provided between the first warm-colored light negative electrode pad 62 and the second warm-colored light positive electrode pad 65 to achieve selective electrical connection between the first warm-colored light negative electrode pad 62 and the second warm-colored light positive electrode pad 65; The first cold-color light negative electrode pad 64 and the second cold-color light positive electrode pad 67 are selectively electrically connected, meaning they can be electrically connected or disconnected, allowing the first cold-color light-emitting module group 3 to emit light independently, or the first cold-color light-emitting module group 3 and the second cold-color light-emitting module group 5 to emit light simultaneously. Specifically, a switch can be provided between the first cold-color light negative electrode pad 64 and the second cold-color light positive electrode pad 67 to achieve selective electrical connection between them.

[0030] Further explanation: By selectively connecting the first warm-colored negative electrode pad and the second warm-colored positive electrode pad, and selectively connecting the first cold-colored negative electrode pad and the second cold-colored positive electrode pad, the negative electrode of the first warm-colored light-emitting module group 2 can be selectively connected or disconnected from the positive electrode of the second warm-colored light-emitting module group 4, and the negative electrode of the first cold-colored light-emitting module group 3 can be selectively connected or disconnected from the positive electrode of the second cold-colored light-emitting module group 5. This allows the COB device to have four modes: the first warm-colored light-emitting module group 2 illuminates alone, the first cold-colored light-emitting module group 3 illuminates alone, the first warm-colored light-emitting module group 2 and the second warm-colored light-emitting module group 4 illuminate together, and the first cold-colored light-emitting module group 3 and the second cold-colored light-emitting module group 5 illuminate together. This allows for adjustment of the color temperature of the first and second light-emitting areas, as well as adjustment of the emission angle of the COB device.

[0031] See Figure 2 The diagram shows the current flow of a COB device according to an embodiment of the present invention when both the first and second light-emitting regions are emitting light. The current flow diagram shows that the negative electrode (W1-) of the first warm-colored light-emitting module group 2 and the positive electrode (W2+) of the second warm-colored light-emitting module group 4 are electrically connected, causing both groups to light up. Simultaneously, the negative electrode (C1-) of the first cool-colored light-emitting module group 3 and the positive electrode (C2+) of the second cool-colored light-emitting module group 5 are electrically connected, causing both groups to light up. Furthermore, W1- and W2+ can be disconnected, and C1- and C2+ can be disconnected, allowing the first warm-colored light-emitting module group 2 and the first cool-colored light-emitting module group 3 to reflect light independently.

[0032] In one embodiment, the first light-emitting region 11 is circular, and the second light-emitting region 12 is annular; The ratio of the ring width of the second light-emitting region 12 to the radius of the first light-emitting region 11 is 1:1.2 to 1:2.5.

[0033] The geometric layout adopts a "circular inner circle + annular outer circle", and the ratio of the ring width to the inner circle radius is limited to 1:1.2~1:2.5. This ensures that the area ratio of the first light-emitting area and the second light-emitting area 12 can meet the switching requirements of narrow angle and wide angle, and also ensure the balance of light intensity distribution.

[0034] In one embodiment, the distance between the first warm-colored light-emitting module 21 and the adjacent first cool-colored light-emitting module 31 is smaller than the distance between the second warm-colored light-emitting module 41 and the adjacent second cool-colored light-emitting module 51. The smaller distance between adjacent light-emitting modules within the first light-emitting region 11 results in a denser distribution of the first warm-colored light-emitting modules 21 and the first cool-colored light-emitting modules 31 per unit area, with the light-emitting points closer to the central region. This concentrates the light-emitting surface and reduces the divergence angle of the emitted light, thus creating a narrow-angle focusing effect. Conversely, the larger distance between adjacent light-emitting modules within the second light-emitting region 12 results in a sparser distribution of light-emitting modules per unit area and a wider distribution range of light-emitting points. This increases the divergence angle of the emitted light, creating a wide-angle floodlight effect.

[0035] In one embodiment, the color temperature ranges of the first warm-color light-emitting module 21 and the second warm-color light-emitting module 41 are 1800K~3500K, respectively.

[0036] In one embodiment, both the first warm-color light emission module 21 and the second warm-color light emission module 41 are low color temperature CSP chips.

[0037] Both the first warm-color light emission module 21 and the second warm-color light emission module 41 use low color temperature CSP chips with a temperature range of 1800K to 3500K. The low color temperature characteristic of the low color temperature CSP chip makes the warm white light emitted rich in long-wave red light, which can enhance the visual sense of texture on the surface of objects (such as the texture of wood and fabric), and is suitable for high-end furniture lighting, catering spaces and other scenarios. In addition, the low thermal resistance characteristic of the low color temperature CSP chip can reduce the junction temperature rise of the warm light module. Combined with the use of a substrate with high thermal conductivity, the COB device can still maintain color temperature stability when working under high load of warm light for a long time, avoiding the color temperature drift problem caused by heat generation in traditional LEDs.

[0038] In one embodiment, the color temperature ranges of the first cold color light emission module 31 and the second cold color light emission module 51 are 4500K~7500K, respectively.

[0039] In one embodiment, both the first cold color light emission module 31 and the second cold color light emission module 51 include an LED chip and a phosphor layer, wherein the phosphor layer covers the top of the LED chip; The color temperature range of the fluorescent adhesive layer is 4500K~7500K.

[0040] Specifically, the fluorescent adhesive layer is a mixture of adhesive material and phosphor, and the color temperature range of the phosphor is 4500K~7500K. Preferably, the adhesive material is epoxy resin or silicone.

[0041] In one embodiment, the substrate 1 is an aluminum substrate or a ceramic substrate to ensure heat dissipation performance. Specifically, the aluminum substrate can be a high thermal conductivity aluminum substrate (thermal conductivity ≥200W / mK) or a mirror aluminum substrate.

[0042] In one embodiment, an encapsulation layer (not shown) is further included, which covers the first light-emitting region 11 and the second light-emitting region 12. Preferably, the encapsulation layer may be a transparent silicone layer or a micro-milky white adhesive layer with a diffusion effect.

[0043] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without any inventive effort, and these embodiments will all fall within the scope of protection of this utility model.

Claims

1. A dual-color temperature COB device with variable emission angle, characterized in that, The substrate includes a first light-emitting region and a second light-emitting region disposed on the surface of the substrate, the second light-emitting region surrounding the first light-emitting region; The first light-emitting area is provided with a first warm-color light-emitting module group and a first cool-color light-emitting module group. The first warm-color light-emitting module group includes a plurality of first warm-color light-emitting modules, and the first cool-color light-emitting module group includes a plurality of first cool-color light-emitting modules. The first warm-color light-emitting modules and the first cool-color light-emitting modules are arranged alternately. The second light-emitting area is provided with a second warm-color light-emitting module group and a second cool-color light-emitting module group. The second warm-color light-emitting module group includes a plurality of second warm-color light-emitting modules, and the second cool-color light-emitting module group includes a plurality of second cool-color light-emitting modules. The second warm-color light-emitting modules and the second cool-color light-emitting modules are arranged alternately.

2. The dual-color temperature COB device with variable emission angle according to claim 1, characterized in that, The surface of the substrate is further provided with a first warm-color light positive electrode pad, a first warm-color light negative electrode pad, a first cool-color light positive electrode pad, a first cool-color light negative electrode pad, a second warm-color light positive electrode pad, a second warm-color light negative electrode pad, a second cool-color light positive electrode pad, and a second cool-color light negative electrode pad. The positive electrode of the first warm-color light emitting module group is electrically connected to the first warm-color light positive electrode pad, and the negative electrode of the first warm-color light emitting module group is connected to the first warm-color light negative electrode pad. The positive electrode of the first cold color light emission module group is electrically connected to the first cold color light positive electrode pad, and the negative electrode of the first cold color light emission module group is electrically connected to the first cold color light negative electrode pad. The positive electrode of the second warm-color light-emitting module group is electrically connected to the positive electrode pad of the second warm-color light, and the negative electrode of the second warm-color light-emitting module group is electrically connected to the negative electrode pad of the second warm-color light. The positive electrode of the second cold color light emission module group is electrically connected to the positive electrode pad of the second cold color light emission module group, and the negative electrode of the second cold color light emission module group is electrically connected to the negative electrode pad of the second cold color light emission module group.

3. The dual-color temperature COB device with variable emission angle according to claim 2, characterized in that, The first warm-color light negative electrode pad and the second warm-color light positive electrode pad are selectively electrically connected; The first cold color light negative electrode pad and the second cold color light positive electrode pad are selectively electrically connected.

4. The dual-color temperature COB device with variable emission angle according to claim 1, characterized in that, The first luminescent area is circular, and the second luminescent area is annular; The ratio of the ring width of the second light-emitting region to the radius of the first light-emitting region is 1:1.2 to 1:2.

5.

5. The dual-color temperature COB device with variable emission angle according to claim 1, characterized in that, The distance between the first warm-color light-emitting module and the adjacent first cool-color light-emitting module is smaller than the distance between the second warm-color light-emitting module and the adjacent second cool-color light-emitting module.

6. The dual-color temperature COB device with variable emission angle according to claim 1, characterized in that, The color temperature ranges of the first warm-color light-emitting module and the second warm-color light-emitting module are 1800K~3500K, respectively; The color temperature ranges of the first and second cold color light emission modules are 4500K to 7500K, respectively.

7. The dual-color temperature COB device with variable emission angle according to claim 6, characterized in that, Both the first warm-color light emission module and the second warm-color light emission module are low color temperature CSP chips.

8. The dual-color temperature COB device with variable emission angle according to claim 6, characterized in that, Both the first and second cold-color light-emitting modules include an LED chip and a phosphor layer, with the phosphor layer covering the top of the LED chip; The color temperature range of the fluorescent adhesive layer is 4500K~7500K.

9. The dual-color temperature COB device with variable emission angle according to claim 1, characterized in that, The substrate is an aluminum substrate or a ceramic substrate.

10. The dual-color temperature COB device with variable emission angle according to claim 1, characterized in that, It also includes an encapsulation layer for covering the first light-emitting area and the second light-emitting area.

Images