A light emitting device with uniform color mixing

Abstract

This application relates to the field of LED light-emitting technology, specifically to a uniformly mixed color light-emitting device, comprising: a support; at least two light-emitting chips; and a light adjustment structure disposed on the light-emitting path of the light-emitting chips. The light adjustment structure includes a light-shielding part and a light-transmitting part, the light-transmitting part including a light-incident end and a light-emitting end. The light-emitting chips are located within the projection area of ​​the light adjustment structure on the support, and the light-emitting chips form at least a partially overlapping area on the illumination surface where the light-emitting end is located. The light-transmitting part is configured such that the projection of the light-emitting end on the illumination surface coincides with or falls within the overlapping area. The light-shielding part can reflect or absorb stray light from the non-overlapping area, while the projection of the light-emitting end of the light-transmitting part on the illumination surface coincides with or falls within the overlapping area, allowing light from the overlapping area to escape. The light-emitting device ultimately forms a high-brightness, uniformly bright, and uniformly colored overlapping light spot.

Description

Technical Field

[0001] This application relates to the field of LED light-emitting technology, specifically to a light-emitting device with uniform color mixing. Background Technology

[0002] In the field of LED lighting technology, in order to improve illuminance or synthesize new light colors, it is usually necessary to integrate multiple light-emitting chips of different colors into the same light-emitting device. Existing technologies mostly adopt a solution of setting two or more light-emitting chips on a bracket and covering them with optical lenses for shaping.

[0003] However, due to the differences in the spatial position of each light-emitting chip on the support, the multiple light spots formed on the target illumination surface after the light beams they emit are difficult to completely overlap after passing through the lens. They only partially overlap in a limited central area, and cannot form high-quality mixed light spots with high brightness, high brightness uniformity and high color uniformity at close range. Summary of the Invention

[0004] This application mainly addresses the technical problem that the projections of the illumination surfaces of multiple light-emitting chips in existing uniformly mixed light-emitting devices cannot completely overlap.

[0005] One embodiment provides a uniformly mixed color light-emitting device, comprising:

[0006] support;

[0007] At least two light-emitting chips are mounted on the bracket;

[0008] A light adjustment structure is disposed on the light emission path of the light-emitting chip. The light adjustment structure includes a light-blocking part for blocking part of the light and a light-transmitting part for transmitting light. The light-transmitting part includes an incident end for light to enter and an exit end for light to exit.

[0009] Wherein, the light-emitting chip is located in the projection area of ​​the light-transmitting part of the light adjustment structure on the bracket, the light-emitting chip forms at least a partially overlapping area on the irradiation surface where the light-emitting end is located, and the light-transmitting part is configured such that the projection of the light-emitting end on the irradiation surface coincides with or falls into the overlapping area.

[0010] In some embodiments, the cross-section of the light-transmitting portion remains unchanged along the direction of light illumination.

[0011] In some embodiments, the cross-section of the light-transmitting portion gradually decreases along the direction of light illumination.

[0012] In some embodiments, the cross-section of the light-transmitting portion gradually increases along the direction of light illumination.

[0013] In some embodiments, along the direction of light illumination, the cross-section of the light-transmitting portion first gradually decreases and then gradually increases.

[0014] In some embodiments, the light-shielding part is made of a material that reflects the light emitted by the light-emitting chip.

[0015] In some embodiments, the light-shielding part is made of a material that absorbs the light emitted by the light-emitting chip.

[0016] In some embodiments, the uniformly mixed light-emitting device includes one or more focusing lenses disposed on the light emission path of the light-emitting chip.

[0017] In some embodiments, the condensing lens covers the light-emitting chip, or a cavity is formed between the condensing lens and the light-emitting chip.

[0018] In some embodiments, the shape of the light spot of the light-emitting chip is at least one of the following: circular, rectangular, elliptical, hexagonal, or octagonal.

[0019] According to the uniform color mixing light-emitting device of the above embodiment, the light spot formed by the light-emitting chip on the irradiation surface includes overlapping and non-overlapping areas. The light adjustment structure is disposed on the light-emitting path of the light-emitting chip. The light-shielding part can reflect or absorb stray light from the non-overlapping area, while the projection of the light-emitting end of the light-transmitting part on the irradiation surface coincides with or falls into the overlapping area, allowing light from the overlapping area to be emitted. The light-emitting device can ultimately form a high-brightness, uniform-brightness, and uniform-color overlapping light spot. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the structure of an existing multi-chip integrated light-emitting device;

[0021] Figure 2 for Figure 1 A schematic diagram of the light spot stacking structure of the light-emitting devices in the diagram;

[0022] Figure 3 This is a schematic diagram of the structure of a first embodiment of the uniformly mixed color light-emitting device of this application;

[0023] Figure 4 for Figure 3 Top view of the light adjustment structure of a uniformly mixed light-emitting device;

[0024] Figure 5 for Figure 3 A schematic diagram of the light spot stacking structure of a uniformly mixed color light-emitting device;

[0025] Figure 6 This is a schematic diagram of the structure of a second embodiment of the uniformly mixed color light-emitting device of this application;

[0026] Figure 7 This is a schematic diagram of the structure of a third embodiment of the uniformly mixed color light-emitting device of this application;

[0027] Figure 8 This is a schematic diagram of the structure of Embodiment 4 of the uniformly mixed color light-emitting device of this application;

[0028] Figure 9 This is a schematic diagram of the structure of Embodiment 5 of the uniformly mixed color light-emitting device of this application;

[0029] Figure 10 This is a schematic diagram of the structure of Embodiment Six of the uniformly mixed color light-emitting device of this application;

[0030] Figure 11 This is a schematic diagram of the structure of Embodiment 7 of the uniformly mixed color light-emitting device of this application;

[0031] Figure 12 This is a schematic diagram of the light spot stacking structure of an embodiment of the uniformly mixed color light-emitting device of this application.

[0032] Figure label:

[0033] 100. Support; 11. First light-emitting chip; 12. Second light-emitting chip; 13. Light adjustment structure; 131. Light-shielding part; 132. Light-transmitting part; 133. Light-inlet end; 134. Light-out end; 14. Condensing lens. Detailed Implementation

[0034] The present application will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0035] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0036] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0037] In the field of LED light-emitting technology, in order to improve illuminance or synthesize new light colors, it is usually necessary to integrate multiple light-emitting chips of different colors into the same light-emitting device. Currently, the common approach is to set two or more light-emitting chips on a bracket 100 and cover them with an optical lens for shaping.

[0038] like Figure 1 As shown, existing multi-chip integrated light-emitting devices include a bracket 100, light-emitting chips, and a condenser lens 14. At least two light-emitting chips are disposed within the bracket 100. Figure 1 The light-emitting device shown has two light-emitting chips, namely a first light-emitting chip 11 and a second light-emitting chip 12, and a lens for optical shaping is provided above the light-emitting chips.

[0039] like Figure 2 As shown in the schematic diagram of the light spot stacking of the existing multi-chip integrated light-emitting device, the illumination area of ​​the first light-emitting chip 11 is region A1, and the illumination area of ​​the second light-emitting chip 12 is region A2. Since the first light-emitting chip 11 and the second light-emitting chip 12 are located at different positions on the support 100, the light spots emitted from the lens are difficult to completely overlap, that is, regions A1 and A2 do not completely overlap, but only overlap in region A3.

[0040] To increase the overlap area, the optical axes of the two light-emitting chips are typically designed to be closer together. Under this design, the overlap area of ​​the illumination surfaces closer to the first light-emitting chip 11 and the second light-emitting chip 12 is smaller, while the overlap area of ​​the illumination surfaces farther away from the first light-emitting chip 11 and the second light-emitting chip 12 is larger. A larger illumination surface area farther away results in lower light brightness, which fails to improve the illuminance of the light-emitting device. Conversely, while the illumination surface closer to the first light-emitting chip 11 and the second light-emitting chip 12 has higher light brightness, the insufficient overlap area of ​​the two light-emitting chips' illumination surfaces leads to less than ideal uniformity in the brightness and color of the mixed light beam.

[0041] Based on the above background description, the problems with the existing technology are: the projections of the illumination surfaces of multiple light-emitting chips in the existing uniform color mixing light-emitting devices cannot completely overlap, and they cannot form overlapping light spots with high brightness, uniform brightness, and uniform color at close range.

[0042] To address the aforementioned technical problems, this application provides a uniformly mixed color light-emitting device.

[0043] like Figures 3-5 As shown, in one embodiment, the uniformly mixed color light-emitting device includes: a support 100, at least two light-emitting chips, and a light adjustment structure 13. The support 100 is used to fix the light-emitting chips. Figure 3 The bracket 100 shown is a cup-shaped structure, which provides a large space and facilitates chip fixing and packaging. Two light-emitting chips are fixed in the central area within the cup-shaped structure. In other embodiments, the substrate can also be a substrate-shaped structure. Two light-emitting chips are provided, namely a first light-emitting chip 11 and a second light-emitting chip 12.

[0044] like Figure 4 As shown, the light adjustment structure 13 is disposed on the light emission path of the light-emitting chip. The light adjustment structure 13 includes a light-blocking part 131 for blocking part of the light and a light-transmitting part 132 for transmitting light. The light-transmitting part 132 includes an incident end 133 for light to enter and an exit end 134 for light to exit.

[0045] In this embodiment, the light adjustment structure 13 is a light-cutting ring. The main structure of the light-cutting ring is the light-shielding part 131, and its central hollow area is the light-transmitting part 132. The cross-section of the light-transmitting part 132 remains unchanged along the direction of light irradiation. The light-shielding part 131 absorbs or reflects the light beam emitted by the light-emitting chip, while the light-transmitting part 132 allows light from the light-emitting chip to pass through. The end of the light-transmitting part 132 closest to the light-emitting chip is the light-incident end 133, and the end furthest from the light-emitting chip is the light-exit end 134. In other embodiments, the light-transmitting part 132 can also be formed from a solid material that transmits light.

[0046] The light-emitting chip is located within the projection area of ​​the light-transmitting portion 132 of the light-adjusting structure 13 on the support 100. This arrangement allows as much light emitted from the light-emitting chip as possible to pass through the light-transmitting portion 132 of the light-adjusting structure 13, rather than being blocked by the end face of the light-shielding portion 131, which is beneficial for improving the light utilization rate and illuminance of the light-emitting chip. Preferably, the light-emitting chip is located within the projection area formed by the light-transmitting portion 132 of the light-adjusting structure 13 on the support 100.

[0047] The light-emitting chips form a light spot on the illumination surface where the light-emitting end 134 is located. The light spot includes an overlapping area and a non-overlapping area of ​​the light spots from the two light-emitting chips. It should be understood that the overlapping and non-overlapping areas formed by the light-emitting chips on the illumination surface are assumed to be in the absence of the light adjustment structure 13. Within the overlapping area, the light spot has higher brightness and more uniform brightness and color.

[0048] The light-transmitting part 132 is configured such that the projection of the light-emitting end 134 onto the irradiation surface coincides with or falls into the overlapping area.

[0049] The light adjustment structure 13 is set on the light emission path of the light-emitting chip. The light-shielding part 131 can reflect or absorb stray light from the non-overlapping area, while the projection of the light-emitting end 134 of the light-transmitting part 132 on the irradiation surface coincides with or falls into the overlapping area, allowing light from the overlapping area to be emitted. The light-emitting device can ultimately form a high-brightness, uniform brightness, and uniform color overlapping light spot.

[0050] The working principle of the light adjustment structure 13 is described below using a light spot stacking method. For example... Figure 5 As shown, assuming no light-cutting ring is provided, the illumination area of ​​the first light-emitting chip 11 on the plane where the light-emitting end 134 is located is region A1, and the illumination area of ​​the second light-emitting chip 12 on the plane where the light-emitting end 134 is located is region A2. Regions A1 and A2 overlap only in region A3. Region A1 includes region A3 and also the edge region A4, and region A2 includes region A3 and also the edge region A5. That is, regions A4 and A5 do not overlap.

[0051] The projection area of ​​the light-blocking portion 131 of the light-cutting ring onto the plane where the light-emitting end 134 is located is region A6. Region A6 covers regions A4 and A5, and includes a portion of the edge of region A3. The region corresponding to the light-emitting end 134 is region A7, which is located within region A3, but its covered area is smaller than that of region A3. With this design, stray beams from regions A4 and A5 are reflected or absorbed by the light-blocking portion 131 of the light-cutting ring, enabling the uniformly mixed color light-emitting device of this application to ultimately generate overlapping light spots with high brightness, uniform brightness, and uniform color.

[0052] It should be noted that the projection area of ​​the light-blocking portion 131 of the light-blocking ring onto the plane where the light-emitting end 134 is located is region A6. Region A6 covers regions A4 and A5. This is only a preferred light-blocking ring structure, not a necessary condition. When the light-emitting chip is located inside the light-blocking ring, the inner circumferential surface of the light-blocking ring can block the light from regions A4 and A5, and it is not necessary for its projection A6 to cover regions A4 and A5.

[0053] Furthermore, the region corresponding to the light-emitting end 134 is region A7. Region A7 is located within region A3, which should be understood as two situations: region A7 completely overlaps with region A3; region A7 completely falls within region A3.

[0054] Preferably, the area occupied by region A7 is greater than 80% of the area occupied by region A3. More preferably, in the proposed scheme, the area occupied by region A7 is greater than 90% of the area occupied by region A3.

[0055] In this embodiment, the light-shielding portion 131 of the light-adjusting structure 13 is preferably made of a material that absorbs the light beams emitted by the first light-emitting chip 11 and the second light-emitting chip 12. Specifically, the light-shielding portion 131 is made of a polymer containing light-absorbing particles.

[0056] Furthermore, the polymer is one or more of silicone, silicone resin, and epoxy resin, and the light-absorbing particles are one or more of carbon black, metal particles, graphite, and dark rubber.

[0057] In some embodiments, such as Figure 6 As shown, the cross-section of the light-transmitting portion 132 gradually decreases along the direction of light illumination. In this embodiment, the light-emitting end 134 of the light-transmitting portion 132 is smaller than the light-incident end 133, that is, the opening from the light-incident end 133 to the light-emitting end 134 has a constricting shape. Compared to Figure 3 In the embodiment shown, the light-emitting device generates overlapping light spots with better edge cutoff and clearer spot boundaries, which can better avoid the slight scattering of the light beam by the edge of the light-emitting end 134.

[0058] Preferably, in this embodiment, the light-shielding part 131 of the light adjustment structure 13 reflects the light emitted by the light-emitting chip.

[0059] In some embodiments, such as Figure 7 As shown, the cross-section of the light-transmitting portion 132 gradually increases along the direction of light illumination. In this embodiment, the light-emitting end 134 of the light-transmitting portion 132 is larger than the light-incident end 133, that is, the opening from the light-incident end 133 to the light-emitting end 134 is an expanding shape, compared to... Figure 3 The embodiment shown in this example has a higher light energy utilization rate in generating overlapping light spots.

[0060] Preferably, when the light-shielding part 131 is made of a material that absorbs the light beam emitted by the first light-emitting chip 11 and the second light-emitting chip 12, the light energy utilization rate of the light-emitting device will be slightly worse because the light-absorbing material itself absorbs a certain amount of light beam. The light-transmitting part 132 with an expanded shape can improve the light utilization rate. Therefore, this combination is a better solution.

[0061] Optionally, when the light-shielding part 131 is made of a material that reflects the light beams emitted by the first light-emitting chip 11 and the second light-emitting chip 12, this scheme will increase the probability of stray light beams being generated at the edge of the overlapping light spots. Therefore, the cutoff performance of the overlapping light spot boundary will be slightly worse than... Figure 3 and Figure 6 The overlapping area of ​​the light-emitting device is shown in the figure.

[0062] In some embodiments, such as Figure 8 As shown, along the direction of light illumination, the cross-section of the light-transmitting portion 132 gradually decreases and then gradually increases. In this embodiment, the light-transmitting portion 132 of the light-emitting device has a shape that first contracts and then expands from the light-incident end 133 to the light-emitting end 134. Since the light beam of the light-emitting chip itself has diffusivity, the diffusion range of the light beam in the first half is not large. At this time, the contraction of the light-transmitting portion 132 has a limited adverse effect on the light extraction rate. However, when the light beam diffusion increases in the second half, the expansion of the light-transmitting portion 132 will help improve the light extraction rate.

[0063] Preferably, when the light-shielding part 131 is made of a material that reflects the light beams emitted by the first light-emitting chip 11 and the second light-emitting chip 12, the constricted shape design of the front half can relatively reduce the proportion of stray light beams generated at the edge of the overlapping light spots.

[0064] In some embodiments, the uniformly mixed color light-emitting device includes one or more condenser lenses 14, which are disposed in the light emission path of the light-emitting chip. The condenser lens 14 has a focusing effect on the light beams generated by the first light-emitting chip 11 and the second light-emitting chip 12, so as to obtain a brighter light spot.

[0065] like Figure 9 As shown, the focusing lens 14 covers the first light-emitting chip 11 and the second light-emitting chip 12, and is located on the lower side of the light adjustment structure 13.

[0066] It should be noted that when the condenser lens 14 is added, the overlapping light spot A3 area of ​​the first light-emitting chip 11 and the second light-emitting chip 12 on the plane of the light-emitting end 134 will be reduced. At this time, the light-emitting end 134 of the light adjustment structure 13 should also be correspondingly reduced in size to obtain a high-brightness, uniform brightness, and uniform color overlapping light spot. That is, at this time, it is still necessary to ensure that the A7 area is located within the A3 area and the covered area is smaller than the A3 area.

[0067] like Figure 10 As shown, a cavity is formed between the condenser lens 14 and the light-emitting chip. Specifically, the condenser lens 14 can be fixed on the bracket 100, or for the hollow light adjustment structure 13, the condenser lens 14 can also be fixed inside the light-shielding part 131. The cavity can also reflect and converge the light beam from the light-emitting chip to improve the brightness of the light spot.

[0068] exist Figure 9 and Figure 10 In the proposed solution, the addition of a focusing lens 14 creates a stronger focusing effect. At the same time, the phase of the light beam is altered to a certain extent, resulting in fewer light beams emanating from the inner edge of the light-emitting end 134. This reduces the problem of a small amount of stray light being generated by the scattering effect of the inner edge of the light-emitting end 134.

[0069] like Figure 11 As shown, in Figure 9 or Figure 10 Based on the above scheme, the condenser lens 14 can also be multiple. Figure 11 by Figure 10 Based on this, the technical solution can be improved and designed; in practice, it can also be based on... Figure 9 Based on this, technological improvements were made. Compared to Figure 9 or Figure 10 The plan, Figure 11 The proposed solution further alters the phase of the beam, thereby reducing the scattering effect at the inner edge of the output end 134 and preventing the formation of a small amount of stray light.

[0070] In some embodiments, such as Figure 12 As shown, the light spot shape of the light-emitting chip is circular. In other embodiments, the light spot shape of the light-emitting chip may also be at least one of the following: circular, rectangular, elliptical, hexagonal, or octagonal. That is, this application does not limit the light spot shape of the light-emitting chip.

[0071] Furthermore, the shape of the light-emitting end 134 of the light-transmitting part 132 in the light-adjusting structure 13 is not limited, and can be square, round, rectangular, elliptical, hexagonal, octagonal, etc.

[0072] In some embodiments, the number of light-emitting chips in the uniformly mixed color light-emitting device can be three, four or even more. By adjusting the light-emitting structure and the light-emitting chips as described above, overlapping light spots with high brightness, uniform brightness and uniform color can be generated.

[0073] The above examples illustrate this application only to aid understanding and are not intended to limit its scope. Those skilled in the art to which this application pertains can make various simple deductions, modifications, or substitutions based on the ideas presented.

Claims

1. A uniformly mixed color light-emitting device, characterized in that, include: support; At least two light-emitting chips are mounted on the bracket; A light adjustment structure is disposed on the light emission path of the light-emitting chip. The light adjustment structure includes a light-blocking part for blocking part of the light and a light-transmitting part for transmitting light. The light-transmitting part includes an incident end for light to enter and an exit end for light to exit. In this configuration, all the light-emitting chips are located within the projection area of ​​the light-transmitting portion of the light adjustment structure on the bracket. The light-emitting chips form at least partially overlapping areas and non-overlapping areas on the irradiation surface where the light-emitting end is located. The light-transmitting portion is configured such that the projection of the light-emitting end on the irradiation surface coincides with or falls into the overlapping area. The light-blocking part can absorb stray light from the non-overlapping area, while the light-transmitting part only allows light from the overlapping area to escape; Along the direction of light illumination, the cross-section of the light-transmitting part first gradually decreases and then gradually increases.

2. The uniformly mixed color light-emitting device according to claim 1, characterized in that, The light-shielding part is made of a material that absorbs the light emitted by the light-emitting chip.

3. The uniformly mixed color light-emitting device according to claim 1, characterized in that, It includes one or more focusing lenses, which are disposed on the light emission path of the light-emitting chip.

4. The uniformly mixed color light-emitting device according to claim 3, characterized in that, The condensing lens covers the light-emitting chip, or a cavity is formed between the condensing lens and the light-emitting chip.

5. The uniformly mixed color light-emitting device according to claim 1, characterized in that, The shape of the light spot of the light-emitting chip is at least one of the following: circular, rectangular, elliptical, hexagonal, or octagonal.

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