LED light-emitting unit, LED light source and LED light source system

Abstract

The utility model discloses an LED light-emitting unit, an LED light source and an LED light source system, the LED light-emitting unit comprises a light-emitting area and an electrode group, the light-emitting area at least comprises a first light-emitting area and a second light-emitting area which is approximately located on the periphery of the first light-emitting area, and the first light-emitting area and the second light-emitting area belong to the same LED chip. The light-emitting surface of the light-emitting area is a light-emitting surface, the electrode group at least comprises a first electrode group and a second electrode group, the first electrode group and the second electrode group each comprise a positive electrode and a negative electrode, and the positive electrodes and the negative electrodes are arranged around the light-emitting surface or arranged on the side edges of the light-emitting surface. The first light-emitting area and the second light-emitting area can be independently driven and controlled. According to the LED light-emitting unit, the LED light source and the LED light source system, by controlling the different light-emitting areas of the LED chips respectively, adjustment of light emitting uniformity can be achieved, the overall driving current can be reduced, and improvement of driving energy efficiency is better facilitated.

Description

Technical Field

[0001] This utility model relates to the field of light source technology, and more specifically, to an LED light-emitting unit, an LED light source, and an LED light source system. Background Technology

[0002] Planar LED chips are widely used in various lighting products. Their superior energy efficiency offers significant advantages over traditional bulbs and filaments. Furthermore, the planar shape of the LED chip's light-emitting area provides excellent compatibility with transmission optics systems. In the lighting industry, a common approach is to coat a blue LED chip with a yellow phosphor layer to convert some of the blue light wavelength to yellow light, which is then mixed to emit white light. This is currently the mainstream light source solution. To achieve the highest possible light collection efficiency, a collimating light collection system is typically used to obtain the illumination spot. Theoretically, the light distribution of the illumination spot is relatively consistent with the luminous intensity of the chip itself, exhibiting a relatively uniform surface distribution. For example, if the LED chip's light-emitting area is circular, the illumination spot will also be circular and relatively uniform. However, since collimation and light-gathering systems typically use lenses for light collection, the luminous intensity at the edges of the illumination spot is weaker than that in the central area. This is especially true for high-power LED light source systems with a large number of LED chips, where the luminous intensity in the central area of ​​the spot is higher than that at the edges. This is why double compound-eye lenses are often used for light homogenization in high-power stage lighting modules. However, after homogenization by the compound-eye lens array, the luminous intensity at the center of the spot is significantly reduced. Furthermore, existing LED chip imaging spot designs cannot achieve spot uniformity adjustment while maintaining relatively consistent power and light output, resulting in a limited functionality. Utility Model Content

[0003] This utility model aims to overcome at least one of the defects of the prior art and provides an LED light-emitting unit, an LED light source, and an LED light source system. The light-emitting area of ​​the LED light-emitting unit, LED light source, and LED light source system has at least two independently controllable light-emitting areas, inside and outside. By controlling different light-emitting areas separately, the uniformity of the light spot can be adjusted, and the overall driving current can be reduced, which is more conducive to improving driving energy efficiency. In addition, it has thermal and electrical separation, good heat dissipation effect, and can also be used in series with multiple LED light-emitting units.

[0004] The technical solution adopted by this utility model is as follows:

[0005] An LED light-emitting unit includes a light-emitting region and an electrode group. The light-emitting region includes at least a first light-emitting region and a second light-emitting region generally located around the periphery of the first light-emitting region. The first light-emitting region and the second light-emitting region belong to the same LED chip. The light-emitting surface of the light-emitting region is a light-emitting surface. The electrode group includes at least a first electrode group and a second electrode group. Both the first electrode group and the second electrode group include a positive electrode and a negative electrode. The positive electrode and the negative electrode are arranged around the light-emitting surface or arranged on the side of the light-emitting surface. The first electrode group and the second electrode group are located on the upper surface of the LED light-emitting unit. The positive and negative electrodes of the first electrode group and the second electrode group are independent of each other. The driving current of the first electrode group is a first driving current, and the driving current of the second electrode group is a second driving current. The first light-emitting region and the second light-emitting region are independently driven and controlled by the first driving current and the second driving current, respectively.

[0006] In one embodiment, the bottom of the LED light-emitting unit is a substrate, and the first light-emitting area and the second light-emitting area share the same substrate for encapsulation and heat dissipation.

[0007] In one embodiment, the LED chip is a horizontally mounted LED chip.

[0008] In one embodiment, the first light-emitting region includes, from top to bottom, a first semiconductor layer, a first active layer, a second semiconductor layer, an insulating layer, and a substrate, and also includes a first conductive layer and a second conductive layer. The first semiconductor layer is in ohmic contact with the first conductive layer, and the second semiconductor layer is in ohmic contact with the second conductive layer. The first conductive layer and the second conductive layer are respectively connected to two electrodes of the first electrode group.

[0009] In one embodiment, the second light-emitting region includes, from top to bottom, a third semiconductor layer, a second active layer, a fourth semiconductor layer, an insulating layer, and a substrate, and also includes a third conductive layer and a fourth conductive layer. The third semiconductor layer and the third conductive layer are in ohmic contact, and the fourth semiconductor layer and the fourth conductive layer are in ohmic contact. The third conductive layer and the fourth conductive layer are respectively connected to two electrodes of the second electrode group.

[0010] In one embodiment, the first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer are misaligned in the internal spatial structure of the LED light-emitting unit and are mutually insulated.

[0011] In one embodiment, the first semiconductor layer and the third semiconductor layer are the same, the second semiconductor layer and the fourth semiconductor layer are the same, the first active layer and the second active layer are the same, and the second semiconductor layer and the fourth semiconductor layer are insulated from each other.

[0012] In one embodiment, the area ratio of the first light-emitting region to the second light-emitting region is 1:(0.5~3).

[0013] In one embodiment, the LED chip further includes a third light-emitting region located between the first light-emitting region and the second light-emitting region, wherein the area ratio of the first light-emitting region, the second light-emitting region, and the third light-emitting region is 1:(0.5-3):(0.5-3).

[0014] In one embodiment, the first light-emitting area is a circular light-emitting area, and the second light-emitting area is an annular light-emitting area.

[0015] In one embodiment, the first light-emitting area is a rectangular light-emitting area, and the second light-emitting area is a square-shaped light-emitting area.

[0016] In one embodiment, the light-emitting area is circular or nearly circular, and the diameter of the light-emitting area is 1 to 3 mm.

[0017] In one embodiment, the gap between the first light-emitting area and the second light-emitting area is 0.01 to 0.1 mm.

[0018] An LED light source includes a ceramic substrate with a circuit layer on its upper and lower surfaces and an LED light-emitting unit. The circuit layer includes a first circuit region, a second circuit region, a third circuit region, a fourth circuit region, and a fifth circuit region that are spaced apart from each other in a horizontal direction. The fifth circuit region is located in the middle region of the circuit layer. The ceramic substrate has conductive holes at positions corresponding to the first, second, third, and fourth circuit regions. The circuit layer on the upper and lower surfaces of the ceramic substrate is electrically connected through the conductive holes. The LED light-emitting unit is soldered or bonded to the fifth circuit region.

[0019] In one embodiment, a metal layer is further provided on the surface of the circuit layer one on the upper surface of the ceramic substrate, and the electrode group is connected to the circuit layer one through gold wires and the metal layer.

[0020] In one embodiment, the system includes a copper substrate with a second circuit layer on its surface and the LED light-emitting unit. The copper substrate has a boss-type structure with several protrusions. The LED light-emitting unit is soldered or bonded to the protrusions. The second circuit layer is disposed on the outside of the protrusions. The second circuit layer includes a sixth circuit region, a seventh circuit region, an eighth circuit region, and a ninth circuit region that are spaced apart from each other in the horizontal direction and / or insulated in the vertical direction, and each of these regions has a metal layer on its surface. The electrode assembly is connected to the second circuit layer through gold wires and the metal layer.

[0021] An LED light source system includes a light source substrate, LED light emitters arranged in an array on the light source substrate, a collimating lens assembly and a light-emitting lens disposed in the light-emitting direction of the LED light emitters, wherein at least 50% of the LED light emitters are LED light-emitting units.

[0022] In one embodiment, a light-diffusing component is also included, located between the collimating lens assembly and the light-emitting lens.

[0023] In one embodiment, the area ratio of the first light-emitting region to the second light-emitting region is 1:(0.5 to 3).

[0024] In one embodiment, the surfaces of the first light-emitting area and the second light-emitting area are provided with different phosphor layers or phosphor sheets.

[0025] In one embodiment, the area ratio of the first light-emitting region to the second light-emitting region is 1:(0.9~1.1), the ratio of the first driving current to the second driving current is 1:(1.1~1.3), and the difference in illuminance value at various points of the light spot emitted by the LED light source system is less than 15%.

[0026] In one embodiment, the area ratio of the first light-emitting region to the second light-emitting region is 1:(0.9~1.1), the ratio of the first driving current to the second driving current is 1:(0.25~0.75), and the LED light source system emits a bright spot with a bright center and dark edges.

[0027] In one embodiment, the area ratio of the first light-emitting area to the second light-emitting area is 1:(0.9~1.1), the ratio of the first driving current to the second driving current is 1:(1.5~2), and the LED light source system emits a ring-shaped bright spot with a dark center and bright edges.

[0028] Compared with the prior art, the beneficial effects of this utility model are as follows: The light-emitting area of ​​the LED light-emitting unit described in this application includes at least a first light-emitting area and a second light-emitting area generally located outside the first light-emitting area. The first light-emitting area and the second light-emitting area are independently driven and controlled by a first driving current and a second driving current, respectively. By controlling different light-emitting areas separately, the uniformity of the light spot can be adjusted, and the overall driving current can be reduced, which is more conducive to improving driving energy efficiency. The positive and negative electrodes of the electrode group are arranged around the light-emitting surface or the positive and negative electrodes are arranged on the side of the light-emitting surface. The first electrode group and the second electrode group are located on the upper surface of the LED light-emitting unit, which facilitates thermal and electrical separation. In addition, the internal and external partitioning method is more conducive to the adjustment of the uniformity of the light spot. The LED light source system described in this application can realize the adjustment of the light emission effect and avoid the loss of light energy, while taking into account low energy consumption, high efficiency and multi-functional variable adjustment function. In addition, each electrode group includes an independent positive and negative electrode. When multiple LED light-emitting units are used in series at the same time, the two different light-emitting areas of each LED light-emitting unit can be controlled separately by the two total driving currents. Attached Figure Description

[0029] Figure 1 This is a simplified structural diagram of the LED light-emitting unit in Example 1.

[0030] Figure 2 This is a cross-sectional view of the LED light-emitting unit in Example 1.

[0031] Figure 3 This is a cross-sectional view of the LED light-emitting unit at position A in Example 1.

[0032] Figure 4 This is a cross-sectional view of the LED light-emitting unit at position B in Example 1.

[0033] Figure 5 This is a schematic diagram of another partitioning method in Example 1.

[0034] Figure 6 This is a schematic diagram of another partitioning method for the LED light-emitting unit in Example 1.

[0035] Figure 7 This is a schematic diagram of another partitioning method for the LED light-emitting unit in Example 1.

[0036] Figure 8 This is a schematic diagram of another partitioning method for the LED light-emitting unit in Example 1.

[0037] Figure 9 This is a schematic diagram of another partitioning method for the LED light-emitting unit in Example 1.

[0038] Figure 10This is a cross-sectional view of the LED light source in Example 2.

[0039] Figure 11 This is a cross-sectional view of the LED light source in Example 3.

[0040] Figure 12 This is a simplified structural diagram of the LED light source system in Example 4.

[0041] Figure 13 This is an optical simulation diagram of the LED light source system in the first case of Example 4.

[0042] Figure 14 This is an optical simulation diagram of the LED light source system under the second scenario in Example 4.

[0043] Figure 15 This is an optical simulation diagram of the LED light source system under the third scenario in Example 4.

[0044] Figure 16 This is a simulation diagram of a non-zonal LED light source system.

[0045] Explanation of reference numerals in the attached figures: 100, LED light-emitting unit; 10, light-emitting area; 11, first light-emitting area; 111, first semiconductor layer; 112, first active layer; 113, second semiconductor layer; 114, first conductive layer; 115, second conductive layer; 12, second light-emitting area; 121, third semiconductor layer; 122, second active layer; 123, fourth semiconductor layer; 124, third conductive layer; 125, fourth conductive layer; 13, insulating layer; 14, substrate; 15, third light-emitting area; 16, fourth light-emitting area; 20, electrode assembly; 20 1. Positive electrode; 202. Negative electrode; 200. LED light source; 31. Ceramic substrate; 321. First circuit area; 322. Second circuit area; 323. Third circuit area; 324. Fourth circuit area; 325. Fifth circuit area; 33. Conductive via; 41. Copper substrate; 421. Sixth circuit area; 422. Seventh circuit area; 423. Eighth circuit area; 424. Ninth circuit area; 300. LED light source system; 50. Light source substrate; 60. Collimating lens assembly; 70. Light-emitting lens; 80. Light-diffusing assembly. Detailed Implementation

[0046] The accompanying drawings are for illustrative purposes only and should not be construed as limiting the scope of this invention. To better illustrate the following embodiments, some components in the drawings may be omitted, enlarged, or reduced, and do not represent the actual dimensions of the product. It is understandable to those skilled in the art that some well-known structures and their descriptions may be omitted in the drawings.

[0047] Example 1

[0048] like Figure 1 , Figure 2 As shown, this embodiment discloses an LED light-emitting unit 100, including a light-emitting region 10 and an electrode group 20. The light-emitting region 10 includes at least a first light-emitting region 11 and a second light-emitting region 12 generally located around the first light-emitting region 11. The first light-emitting region 11 and the second light-emitting region 12 belong to the same LED chip. The light-emitting surface of the light-emitting region is the light-emitting surface. The electrode group 20 includes at least a first electrode group and a second electrode group. Both the first electrode group and the second electrode group 22 include a positive electrode 201 and a negative electrode 202. The positive electrode 201 and the negative electrode 202 are both arranged around the light-emitting surface. The first electrode group and the second electrode group are located on the upper surface of the LED light-emitting unit. The positive and negative electrodes of the first electrode group and the second electrode group are independent of each other. The driving current of the first electrode group is a first driving current, and the driving current of the second electrode group is a second driving current. The first light-emitting region 11 and the second light-emitting region 20 are independently driven and controlled by the first driving current and the second driving current, respectively.

[0049] In this embodiment, the center of the LED light-emitting unit 100 is a light-emitting region 10. The light-emitting region 10 includes at least a first light-emitting region 11 and a second light-emitting region 12 generally located around the first light-emitting region 11. The first light-emitting region 11 and the second light-emitting region 12 are independently driven and controlled by the driving currents of the first electrode group and the second electrode group 22, respectively. By controlling different light-emitting regions with different driving currents, the uniformity of the light spot can be adjusted. Furthermore, since the first and second light-emitting regions belong to the same LED chip, the overall driving current can be reduced, which is more conducive to improving driving efficiency. In addition, since the light spot formed by the LED chip after passing through the lens is centrally symmetrical, the inner and outer partitioning method is more conducive to adjusting the uniformity of the light spot. The positive electrode 201 and the negative electrode 202 of the electrode group are both arranged around the light-emitting surface, and the first electrode group and the second electrode group are located on the upper surface of the LED light-emitting unit, which facilitates thermoelectric separation.

[0050] In other embodiments, the positive electrode 201 and the negative electrode 202 may also be disposed on the side of the light-emitting surface.

[0051] Specifically, the bottom of the LED light-emitting unit 100 is a substrate 14, and the first light-emitting area 11 and the second light-emitting area 12 share the same substrate 14 for encapsulation and heat dissipation. More specifically, the LED chip is a horizontally structured, upright LED chip. The LED light-emitting unit 100 is a horizontally structured, upright LED chip with different light-emitting areas sharing the same substrate 14, which facilitates the separation of different light-emitting areas from each other and allows for the separate control of different light-emitting areas through the surface electrode group.

[0052] Furthermore, in this embodiment, the first light-emitting area 11 includes, from top to bottom, a first semiconductor layer 111, a first active layer 112, a second semiconductor layer 113, an insulating layer 13, and a substrate 14, and also includes a first conductive layer 114 and a second conductive layer 115. The first semiconductor layer 111 is in ohmic contact with the first conductive layer 114, and the second semiconductor layer 113 is in ohmic contact with the second conductive layer 115. The first conductive layer 114 and the second conductive layer 115 are respectively connected to the two electrodes of the first electrode group.

[0053] The second light-emitting region 12 includes, from top to bottom, a third semiconductor layer 121, a second active layer 122, a fourth semiconductor layer 123, an insulating layer 13, and a substrate 14. It also includes a third conductive layer 124 and a fourth conductive layer 125. The third semiconductor layer 121 and the third conductive layer 124 are in ohmic contact, and the fourth semiconductor layer 123 and the fourth conductive layer 125 are in ohmic contact. The third conductive layer 124 and the fourth conductive layer 125 are respectively connected to the two electrodes of the second electrode group 22.

[0054] More specifically, the first conductive layer 114, the second conductive layer 115, the third conductive layer 124, and the fourth conductive layer 125 are misaligned within the internal spatial structure of the LED light-emitting unit and are mutually insulated. This ensures that the conductive layers do not interfere with each other, facilitating independent control of different zones.

[0055] Further, in this embodiment, the first semiconductor layer 111 and the third semiconductor layer 121 are located on the same layer, the second semiconductor layer 113 and the fourth semiconductor layer 123 are located on the same layer, and the first active layer 112 and the second active layer 122 are located on the same layer. More specifically, in this embodiment, the first semiconductor layer 111 and the third semiconductor layer 121 are identical, the second semiconductor layer 113 and the fourth semiconductor layer 123 are identical, the first active layer 112 and the second active layer 122 are identical, and the second semiconductor layer 113 and the fourth semiconductor layer 123 are insulated from each other. More specifically, the first semiconductor layer 111 and the third semiconductor layer 121 are separated by an insulating layer 13 in the horizontal direction, the second semiconductor layer 113 and the fourth semiconductor layer 123 are separated by an insulating layer 13 in the horizontal direction, and the first active layer 112 and the second active layer 122 are separated by an insulating layer 13 in the horizontal direction.

[0056] Furthermore, the area ratio of the first light-emitting area to the second light-emitting area is 1:(0.5~3). More specifically, in this embodiment, the area ratio of the first light-emitting area to the second light-emitting area is 1:(0.9~1.1). In other embodiments, other area ratios may also be used.

[0057] In other embodiments, the LED chip may further include a third light-emitting region located between the first light-emitting region and the second light-emitting region, wherein the area ratio of the first light-emitting region, the second light-emitting region and the third light-emitting region is 1:(0.5~3):(0.5~3).

[0058] In other implementations, such as Figure 5 As shown, the LED chip may also include, from the inside out, a first light-emitting area 11, a third light-emitting area 15, a fourth light-emitting area 16, and a second light-emitting area 12.

[0059] In this embodiment, as Figure 1 As shown, the first light-emitting area 11 is a circular light-emitting area, and the second light-emitting area 12 is an annular light-emitting area. That is, the light-emitting area is a circular light-emitting area. More specifically, in this embodiment, the diameter of the light-emitting area is 1-3 mm.

[0060] In other implementations, such as Figure 6 As shown, the first light-emitting area 11 can also be a rectangular light-emitting area, and the second light-emitting area 12 can be a U-shaped light-emitting area. Alternatively, in other embodiments, the first light-emitting area can be a circular light-emitting area, and the second light-emitting area can be an irregular light-emitting area surrounding the circular light-emitting area, such as... Figure 7 As shown. Alternatively, in other embodiments, the first luminous area can be a polygonal luminous area, and the second luminous area can be an irregular luminous area surrounding the polygonal luminous area. These will not be listed individually here; in practical applications, matching inner and outer partitioning methods can be designed based on actual needs.

[0061] It is worth mentioning that the light-emitting area of ​​this utility model includes at least a first light-emitting area located in the central area of ​​the LED light-emitting unit and a second light-emitting area generally located around the first light-emitting area. This means that visually, the second light-emitting area appears to surround the first light-emitting area, but it is not strictly required that the second light-emitting area completely encloses the first light-emitting area. Figure 8 , Figure 9 The partitioning methods shown all belong to the second luminous area 12, which is generally located outside the first luminous area 11. These will not be listed one by one in this article.

[0062] Furthermore, in this embodiment, the gap between the first light-emitting area 11 and the second light-emitting area 12 is 0.01–0.1 mm. More specifically, the gap between the first light-emitting area 11 and the second light-emitting area 12 is 0.05–0.1 mm. The smaller the gap between the first light-emitting area 11 and the second light-emitting area 12, the better the connection of the light spots when the first light-emitting area 11 and the second light-emitting area 12 are lit simultaneously, and the visual effect of the light spots is seamless.

[0063] Example 2

[0064] like Figure 10As shown, this embodiment discloses an LED light source, including a ceramic substrate 31 with a circuit layer on its upper and lower surfaces and an LED light-emitting unit 100 as described in Embodiment 1. The circuit layer includes a first circuit region 321, a second circuit region 322, a third circuit region 323, a fourth circuit region 324, and a fifth circuit region 325 arranged at intervals in the same horizontal direction. The fifth circuit region 325 is located in the middle region of the circuit layer. The ceramic substrate 31 is provided with conductive holes 33 at positions corresponding to the first circuit region 321, the second circuit region 322, the third circuit region 323, and the fourth circuit region 324. The circuit layer 1 on the upper and lower surfaces of the ceramic substrate 31 is electrically connected through the conductive holes 33. The LED light-emitting unit 100 is soldered or bonded to the fifth circuit region 325.

[0065] Furthermore, a metal layer (not shown in the figure) is also provided on the surface of the first circuit layer on the upper surface of the ceramic substrate 31. The electrode group is connected to the first circuit layer via gold wires and the metal layer. More specifically, the first electrode group is connected to the second circuit region 322 and the fourth circuit region 324 via gold wires and the metal layer, and the second electrode group is connected to the first circuit region 321 and the third circuit region 323 via gold wires and the metal layer. In this embodiment, the specific relative positions of the first circuit region 321, the second circuit region 322, the third circuit region 323, and the fourth circuit region 324 are not particularly required, as long as two of the circuit regions correspond to one electrode group. The metal layer can be a gold layer or a silver layer.

[0066] The above-mentioned circuit packaging method of ceramic substrate 31 with first circuit layer realizes the separate control of different light-emitting areas of LED light-emitting unit 100. The substrate 14 of LED light-emitting unit 100 directly conducts heat through the fifth circuit area 325 and ceramic substrate 31, realizing the thermoelectric separation packaging of the light-emitting area.

[0067] Example 3

[0068] like Figure 11As shown, this embodiment discloses an LED light source, including a copper substrate 41 with a second circuit layer on its surface and an LED light-emitting unit 100 as described in Embodiment 1. The copper substrate 41 has a boss-type structure with several protrusions. The LED light-emitting unit 100 is welded or bonded to the protrusions. The second circuit layer is disposed on the outside of the protrusions. The second circuit layer includes a sixth circuit region 421, a seventh circuit region 422, an eighth circuit region 423, and a ninth circuit region 424, which are spaced apart from each other in the horizontal direction and / or insulated in the vertical direction, and each of their surfaces is provided with a metal layer. The electrode group is connected to the second circuit layer through gold wires and the metal layer. More specifically, the first electrode group is connected to the seventh circuit region 422 and the eighth circuit region 423 through gold wires and the metal layer, and the second electrode group is connected to the sixth circuit region 421 and the ninth circuit region 424 through gold wires and the metal layer. In this embodiment, the specific relative positions of the sixth circuit region 421, the seventh circuit region 422, the eighth circuit region 423, and the ninth circuit region 424 are not particularly required, as long as two of the circuit regions correspond to one electrode group.

[0069] The above-mentioned copper substrate 41 circuit packaging method realizes the separate control of different light-emitting areas of the LED light-emitting unit 100. The substrate 14 of the LED light-emitting unit 100 directly conducts heat through the protrusion of the copper substrate 41, realizing the thermoelectric separation packaging of the light-emitting area.

[0070] Example 4

[0071] This embodiment discloses an LED light source system 300, including a light source substrate 50, LED light emitters arranged in an array on the light source substrate 50, a collimating lens assembly 60 and a light emitting lens 70 arranged in the light emission direction of the LED light emitters, wherein at least 50% of the LED light emitters are LED light emission units 100 as described in Embodiment 1.

[0072] Furthermore, in this embodiment, the light source substrate 50 is a copper substrate with a second circuit layer on its surface. Similar to Embodiment 3, the copper substrate has a boss-type structure with several protrusions. The LED chip is soldered or bonded to the protrusions. The structure of the circuit layer is similar to the second circuit layer in Embodiment 3, and will not be described again here.

[0073] Furthermore, such as Figure 12 As shown, the LED light source is an LED light-emitting unit, that is, 100% of the LED light source is an LED light-emitting unit.

[0074] Furthermore, it also includes a light-diffusing assembly 80 located between the collimating lens assembly 60 and the light-emitting lens 70. The light-diffusing assembly 80 can be a diffuser, a single-sided compound eye lens, or a pair of compound eye lenses, which can further homogenize the light spot, and the homogenization effect is gradually enhanced. When a more uniform light spot is desired, by controlling the second driving current to be greater than the first driving current, the illuminance of the light in the second region 12 can be compensated. After the light-diffusing assembly 80 is applied, a uniform light spot is obtained, and the illuminance at each position is relatively high.

[0075] Furthermore, when the area ratio of the first light-emitting region 11 to the second light-emitting region 12 is 1:(0.9~1.1), and the ratio of the first driving current to the second driving current is 1:(1.1~1.3), the difference in illuminance values ​​at various points of the light spot emitted by the LED light source system is less than 15%. Specifically, in this embodiment, the light spot emitted by the LED light source system refers to the light spot located at the focal plane of the light-emitting lens 70.

[0076] Furthermore, when the area ratio of the first light-emitting region 11 to the second light-emitting region 12 is 1:(0.9~1.1), and the ratio of the first driving current to the second driving current is 1:(0.25~0.75), the LED light source system emits a bright spot with a bright center and dark edges.

[0077] Furthermore, when the area ratio of the first light-emitting area to the second light-emitting area is 1:(0.9~1.1) and the ratio of the first driving current to the second driving current is 1:(1.5~2), the LED light source system emits a bright annular light spot with a dark center and bright edges.

[0078] Furthermore, in this embodiment, taking the light-diffusing component 80 as a fogging diffuser and the area ratio of the first light-emitting area 11 to the second light-emitting area 12 as approximately 1:1, and in conjunction with a fixed-focus lens group, the light spot effect is simulated and analyzed by controlling different driving currents:

[0079] In the first scenario, when the ratio of the first driving current to the second driving current is 1:0.5 (4A and 2A respectively), a relatively bright spot is obtained, with a center-to-edge illuminance ratio of approximately 3.2:1. The optical simulation diagram is shown below. Figure 13 As shown.

[0080] The second scenario: When the ratio of the first driving current to the second driving current is 1:1 (both are 3A), it is similar to the existing technology (the light-emitting area is not divided, and the optical simulation diagram is as follows). Figure 16 As shown in the figure, the obtained illuminance ratio between the center and edge of the light spot is approximately 1.6:1, and its optical simulation diagram is shown in the figure. Figure 14 As shown.

[0081] The third scenario: When the ratio of the first driving current to the second driving current is 1:1.67 (2.25A and 3.75A respectively), a more uniform light spot is obtained, with a center-to-edge illuminance ratio of approximately 1:1. The optical simulation diagram is shown below. Figure 15 As shown.

[0082] To achieve adjustment of color temperature, color rendering index, and color, the surfaces of the first light-emitting area 11 and the second light-emitting area 12 are further provided with different phosphor layers or phosphor sheets. By using different phosphor layers or phosphor sheets in combination with the LED chip, different color temperatures, color rendering indices, or colors of light can be emitted, thereby enabling the adjustment of various light emission effects and providing diverse functions.

[0083] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the technical solution of this utility model, and are not intended to limit the specific implementation of this utility model. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the claims of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. An LED light-emitting unit, characterized in that, The LED light-emitting unit includes a light-emitting area and an electrode group. The light-emitting area includes at least a first light-emitting area and a second light-emitting area generally located around the first light-emitting area. The first and second light-emitting areas belong to the same LED chip. The light-emitting surface of the light-emitting area is the light-emitting surface. The electrode group includes at least a first electrode group and a second electrode group. Both the first and second electrode groups include a positive electrode and a negative electrode. The positive and negative electrodes are arranged around the light-emitting surface or on the side of the light-emitting surface. The first and second electrode groups are located on the upper surface of the LED light-emitting unit. The positive and negative electrodes of the first and second electrode groups are independent of each other. The driving current of the first electrode group is a first driving current, and the driving current of the second electrode group is a second driving current. The first and second light-emitting areas are independently driven and controlled by the first driving current and the second driving current, respectively.

2. The LED light-emitting unit according to claim 1, characterized in that, The bottom of the LED light-emitting unit is a substrate, and the first light-emitting area and the second light-emitting area share the same substrate for encapsulation and heat dissipation.

3. The LED light-emitting unit according to claim 2, characterized in that, The LED chip is a horizontally mounted LED chip.

4. The LED light-emitting unit according to claim 2, characterized in that, The first light-emitting area includes, from top to bottom, a first semiconductor layer, a first active layer, a second semiconductor layer, an insulating layer, and a substrate. It also includes a first conductive layer and a second conductive layer. The first semiconductor layer is in ohmic contact with the first conductive layer, and the second semiconductor layer is in ohmic contact with the second conductive layer. The first conductive layer and the second conductive layer are respectively connected to the two electrodes of the first electrode group.

5. The LED light-emitting unit according to claim 4, characterized in that, The second light-emitting region includes, from top to bottom, a third semiconductor layer, a second active layer, a fourth semiconductor layer, an insulating layer, and a substrate. It also includes a third conductive layer and a fourth conductive layer. The third semiconductor layer and the third conductive layer are in ohmic contact, and the fourth semiconductor layer and the fourth conductive layer are in ohmic contact. The third conductive layer and the fourth conductive layer are respectively connected to the two electrodes of the second electrode group.

6. The LED light-emitting unit according to claim 5, characterized in that, The first conductive layer, the second conductive layer, the third conductive layer, and the fourth conductive layer are misaligned within the internal spatial structure of the LED light-emitting unit and are mutually insulated.

7. The LED light-emitting unit according to claim 5, characterized in that, The first semiconductor layer and the third semiconductor layer are the same, the second semiconductor layer and the fourth semiconductor layer are the same, the first active layer and the second active layer are the same, and the second semiconductor layer and the fourth semiconductor layer are insulated from each other.

8. The LED light-emitting unit according to claim 1, characterized in that, The area ratio of the first light-emitting area to the second light-emitting area is 1:(0.5~3).

9. The LED light-emitting unit according to claim 1, characterized in that, The LED chip also includes a third light-emitting region located between the first light-emitting region and the second light-emitting region, and the area ratio of the first light-emitting region, the second light-emitting region and the third light-emitting region is 1:(0.5~3):(0.5~3).

10. The LED light-emitting unit according to claim 1, characterized in that, The first luminous area is a circular luminous area, and the second luminous area is a ring-shaped luminous area.

11. The LED light-emitting unit according to claim 1, characterized in that, The first light-emitting area is a rectangular light-emitting area, and the second light-emitting area is a U-shaped light-emitting area.

12. The LED light-emitting unit according to claim 1, characterized in that, The light-emitting area is circular or nearly circular, and the diameter of the light-emitting area is 1 to 3 mm.

13. The LED light-emitting unit according to claim 1, characterized in that, The gap between the first light-emitting area and the second light-emitting area is 0.01 to 0.1 mm.

14. An LED light source, characterized in that, The invention comprises a ceramic substrate with a circuit layer on its upper and lower surfaces and an LED light-emitting unit as described in any one of claims 1 to 13. The circuit layer includes a first circuit region, a second circuit region, a third circuit region, a fourth circuit region, and a fifth circuit region arranged at intervals in the horizontal direction. The fifth circuit region is located in the middle region of the circuit layer. The ceramic substrate has conductive holes at positions corresponding to the first, second, third, and fourth circuit regions, through which the circuit layer on the upper and lower surfaces of the ceramic substrate is electrically connected. The LED light-emitting unit is soldered or bonded to the fifth circuit region.

15. The LED light source according to claim 14, characterized in that, The surface of the circuit layer one on the upper surface of the ceramic substrate is further provided with a metal layer, and the electrode group is connected to the circuit layer one through gold wires and the metal layer.

16. An LED light source, characterized in that, The device includes a copper substrate with a second circuit layer on its surface and an LED light-emitting unit as described in any one of claims 1 to 13. The copper substrate has a boss-type structure with a plurality of protrusions. The LED light-emitting unit is soldered or bonded to the protrusions. The second circuit layer is disposed on the outside of the protrusions. The second circuit layer includes a sixth circuit region, a seventh circuit region, an eighth circuit region, and a ninth circuit region that are spaced apart from each other in the horizontal direction and / or insulated in the vertical direction, and each of these regions has a metal layer on its surface. The electrode group is connected to the second circuit layer through gold wires and the metal layer.

17. An LED light source system, characterized in that, The invention includes a light source substrate, LED light emitters arranged in an array on the light source substrate, a collimating lens assembly disposed in the light emission direction of the LED light emitters, and a light emission lens, wherein at least 50% of the LED light emitters are LED light emission units as described in claims 1 to 12.

18. The LED light source system according to claim 17, characterized in that, It also includes a light-diffusing assembly located between the collimating lens assembly and the light-emitting lens.

19. The LED light source system according to claim 18, characterized in that, The area ratio of the first light-emitting region to the second light-emitting region is 1:(0.5~3).

20. The LED light source system according to claim 17, characterized in that, The surfaces of the first luminescent area and the second luminescent area are provided with different phosphor layers or phosphor sheets.

21. The LED light source system according to claim 17, characterized in that, The area ratio of the first light-emitting area to the second light-emitting area is 1:(0.9~1.1), the ratio of the first driving current to the second driving current is 1:(1.1~1.3), and the difference in illuminance value at various points of the light spot emitted by the LED light source system is less than 15%.

22. The LED light source system according to claim 17, characterized in that, The area ratio of the first light-emitting area to the second light-emitting area is 1:(0.9~1.1), the ratio of the first driving current to the second driving current is 1:(0.25~0.75), and the LED light source system emits a bright spot with a bright center and dark edges.

23. The LED light source system according to claim 17, characterized in that, The area ratio of the first light-emitting area to the second light-emitting area is 1:(0.9~1.1), the ratio of the first driving current to the second driving current is 1:(1.5~2), and the LED light source system emits a ring-shaped bright spot with a dark center and bright edges.

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