Light emitting device

Abstract

The invention relates to a lighting device, comprising a connection carrier (1) having a mounting side (1a), a light source (2) which is fastened and electrically connected to the mounting side (1a) of the connection carrier (1), a cover (3) which partially covers the connection carrier (2) on the mounting side (1a) of the connection carrier and laterally surrounds the light source (2), and an optical element (4) having a central region (41), the optical element (4) has a central region (41) which is arranged downstream of the light source (2) on the mounting side (1a) of the connection carrier (1), and wherein a preventive measure is taken in order to prevent light (6, 61) from entering the central region (41) of the optical element (4).

Description

[0001] This application is a divisional application, and its original application is a PCT application with application number PCT / EP2021 / 050769 and application date January 15, 2021, and entered the Chinese national phase on July 5, 2022. The national application number is 202180009811.6, and the name is "Light-emitting device". Technical Field

[0002] The present application provides a light-emitting device. Background Art

[0003] The light emitting device can be used, for example, in a motor vehicle headlamp or in a projection device. The light emitting device is designed to emit light with a wavelength ranging from infrared radiation to ultraviolet radiation during operation. For example, the light emitting device is designed to emit white light during operation. Summary of the Invention

[0004] The object to be achieved is to specify a luminous component which emits light of particularly high quality.

[0005] According to at least one embodiment of the light-emitting device, the light-emitting device includes a connection carrier. The connection carrier is, for example, a circuit board having contacts for contacting electrical components of the light-emitting device. The connection carrier can be, for example, a metal core circuit board, a ceramic carrier with metal contacts, or a printed circuit board. The connection carrier includes a mounting surface on the mounting side, to which the electrical components of the light-emitting device are applied. In addition to its electrical properties for contacting the electrical components of the device, the connection carrier also serves a mechanical support function in the light-emitting device. In other words, at least some components of the light-emitting device are mechanically supported and carried by the connection carrier.

[0006] According to at least one embodiment, the luminous means includes a light source. The light source is configured to generate electromagnetic radiation, in particular light emitted by the luminous means during operation. The luminous means can include one or more light sources, which can be configured identically or differently from one another.

[0007] To this end, the light source may include, for example, one or more LED chips. The LED chips may be, for example, pixelated LED chips. A pixelated LED chip has two or more emission areas that can be controlled separately from one another. For example, the emission areas of a pixelated LED chip are arranged at grid points of a regular grid.

[0008] One or more light-emitting diode chips of a light source include, for example, an active region, which generates primary radiation in the wavelength range of UV radiation and / or blue light during operation. A conversion element can be arranged downstream of the active region, which converts part of the primary radiation into secondary radiation in a wavelength range with lower energy, so that overall mixed light (for example, white mixed light) is emitted.

[0009] The light source of the luminous device is fastened and electrically connected to the mounting side of the connection carrier. For example, the light source is fastened to the mounting surface of the connection carrier by means of solder or adhesive.

[0010] According to at least one embodiment of the light-emitting device, the light-emitting device includes a cover that partially covers the connection carrier on its mounting side and laterally surrounds the light source. The cover can, for example, completely surround the light source laterally without covering it vertically. The lateral direction extends, for example, parallel to a main extension direction of the connection carrier and / or parallel to the mounting surface of the connection carrier. The vertical direction extends perpendicular to the lateral direction.

[0011] To this end, the cover can be in direct contact with the mounting surface of the connection carrier. For example, the cover covers connection elements (e.g., wires) by means of which the electrical components of the light-emitting device are electrically conductively connected to the connection carrier. For example, the cover covers wires by means of which the light source is electrically conductively connected to the connection carrier. The cover can, in particular, surround the light source in the form of a ring or frame. For example, the cover is a top encapsulation.

[0012] According to at least one embodiment of the light-emitting device, the light-emitting device includes an optical element having a central region, which is arranged downstream of the light source on the mounting side of the connection carrier. In other words, the light source is arranged between the connection carrier and the optical element. The optical element has a central region that can be laterally surrounded by an edge region of the optical element. Light incident on the optical element in the central region is optically influenced by the optical element in a targeted manner. Light incident on the edge region can be influenced in an undesirable manner, such that radiation incident on the edge region or radiation incident on the central region of the optical element from the edge region is undesirable.

[0013] The optical element can be, for example, an optical lens, a Fresnel lens, a reflector, a transparent plate, or a concentrator. The optical element serves, for example, to project the light emitted by the light source during operation into the far field, that is, for example, to project the light intensity distribution of the light source into the far field. The optical element is formed from a transparent material such as glass or plastic.

[0014] According to at least one embodiment of the light-emitting device, at least one precaution is taken to prevent light from entering the central region of the optical element. The light can in particular be reflected light. In other words, a precaution is taken such that only light directly emitted by the light source enters the central region of the optical element. Light that has been reflected at least once by another component of the device (e.g., a connection carrier) is prevented from entering the central region by the precaution. Furthermore, the precaution prevents reflected light from entering the acceptance angle of a subsequent optical system.

[0015] Additionally or alternatively, the light may be partially non-reflected light, which is prevented from entering the central region.

[0016] According to at least one embodiment, a light-emitting device is provided, which has

[0017] - a connection carrier having a mounting side,

[0018] - a light source, which is fastened and electrically connected to the mounting side of the connection carrier,

[0019] a cover which partially covers the connection carrier on its mounting side and laterally surrounds the light source,

[0020] an optical element having a central region which is arranged downstream of the light source on the mounting side of the connection carrier, wherein

[0021] - Take precautions to prevent light from entering the central area of ​​the optical element.

[0022] The light-emitting devices described herein are based, inter alia, on the following considerations. When using light-emitting devices, for example in motor vehicle headlights or in projection systems, the light intensity distribution of the light source should be directly projected into the far field. This can lead to the problem that undesirable sharp lines or blurred areas in the edge regions of the luminous field are projected into the far field. This undesirable projection into the far field can occur, for example, because light reflected from other components of the device reaches the central region of the optical element and is thereby projected into the far field. For example, reflections that are undesirable and projected into the far field can occur at the cover and / or at the connection carrier.

[0023] The luminous means described here is based on the recognition that preventing a portion of the reflected and / or non-reflected light from entering the central region of the optical element results in a light density of the light source projected into the far field being achieved without disruptive artifacts.

[0024] According to at least one embodiment of the light-emitting device, the cover is designed to direct light emitted by the light source away from a central region of the optical element. In other words, in this embodiment, the cover is designed, for example, in terms of shape, optical properties, and / or material, such that measures are taken to prevent, for example, reflected light from entering the central region of the optical element. In particular, these measures can ensure that the light is directed away from the acceptance angle of the subsequent optical system.

[0025] For example, the cover can have a thickness that increases at least initially in the direction away from the light source. In this way, the cover can have an outer surface on its side facing away from the connection carrier, which reflects the light incident from the light source away from the central area of ​​the optical element.

[0026] The outer surface, for example, extends at least partially obliquely with respect to the mounting surface of the connection carrier on the mounting side. For example, the outer surface encloses an acute angle with the mounting surface of the connection carrier. Thus, the cross-section of the cover can be, for example, wedge-shaped. In this way, the light emitted by the light source is not directed toward the central region of the optical element, which is particularly located directly above the light source, but rather toward the edge regions of the optical element, or laterally away from the optical element. The central region can be located directly above the light source, while the edge regions can be located above the cover.

[0027] For this purpose, the cover can have, in particular, a reflective outer surface on its side facing away from the connection carrier, which reflects incident light in a directionally directed manner. This can be achieved, for example, by forming the cover from a reflective material and / or having a smooth surface on its surface facing away from the mounting side.

[0028] According to at least one embodiment of the light-emitting device, the cover has a light-reflecting layer on its outer surface. In this embodiment, the outer surface of the cover does not have to be designed in a reflective manner, but rather a further layer is applied to the cover, which is designed to reflect the incident light as directionally as possible. For example, the light-reflecting layer is formed by a layer sequence of layers with different refractive indices, each of which is formed from an electrically insulating material such as a metal oxide and / or a metal nitride and / or a semiconductor oxide and / or a semiconductor nitride. For example, the reflective layer can include alternating sublayers of silicon oxide and silicon nitride. Alternatively, the light-reflecting layer can be a metal layer, which, for example, includes silver and / or aluminum or consists of one of these materials.

[0029] According to at least one embodiment of the light-emitting device, an optical body is disposed between the light source and the cover, directing light emitted by the light source away from a central region of the optical element. The optical body can be, for example, a reflector. The reflector can be directly adjacent to the cover on a side of the cover facing the light source, or a gap can be provided between the cover and the optical body.

[0030] The optical body is formed, for example, from a reflective material or coated on its outer surface with a reflective material. The cross-section of the optical body can be, for example, wedge-shaped, with the wedge tapering toward the light source. The optical body then has an outer surface that extends obliquely relative to the mounting surface of the connection support.

[0031] Furthermore, the optical body may be a light-guiding element that guides light incident into the optical body away from the central region of the optical element. In this case, the optical body may, for example, comprise a light conductor or be a light guide. Furthermore, the optical body may be a light-refracting element (e.g., a prism, for example) that refracts incident light away from the central region of the optical element.

[0032] According to at least one embodiment of the light-emitting device, the optical element comprises a light-absorbing layer in an edge region on the side of the optical element facing the connection carrier, which edge region laterally surrounds the central region. The light-absorbing layer is designed to absorb light. In other words, in this embodiment, the central region of the optical element is surrounded by an absorption layer on the side of the optical element facing the mounting carrier, which absorbs incident light. As a result, light incident in the edge region cannot reach the central region of the optical element. This provides a precaution against, for example, reflected light being incident on the central region of the optical element. The light-absorbing layer, for example, consists of a light-absorbing material that absorbs at least 90% of incident visible light. The light-absorbing layer can then advantageously also absorb non-reflected light and thereby prevent it from entering the central region. For example, organic optical edge lacquers or inorganic coatings are suitable as materials for forming the light-absorbing layer.

[0033] According to at least one embodiment of the light-emitting device, the optical element is covered with a light-reflecting layer in the edge region, on the side of the optical element facing the connection carrier. This light-reflecting layer is designed to reflect reflected light. This prevents light entering the optical element in the edge region from reaching the central region of the optical element, thereby preventing, for example, reflected light from entering the central region of the optical element. The light-reflecting layer is formed, for example, from a material that reflects at least 85% of incident visible light. The light-reflecting layer can advantageously also reflect non-reflected light, thereby preventing it from entering the central region. This material can, for example, be a silver or aluminum coating and / or a dielectric coating.

[0034] According to at least one embodiment of the light-emitting device, an aperture is arranged between the light source and the optical element, which aperture covers the light source and the cover. The aperture takes precautions against light entering the central region of the optical element. To this end, the aperture has an optical opening, in particular in the region of the central region of the optical element (i.e., for example, directly below the central region of the optical element), through which light from the light source can pass. This opening is then arranged, for example, directly above the light source. The aperture has a light-proof area directly above the cover, which prevents a portion of the light reflected at the cover and / or non-reflected light from entering. In this way, light cannot reach the central region of the optical element.

[0035] According to at least one embodiment, the aperture includes a base and a light-proof layer, wherein the light-proof layer covers the base in the area above the cover, and the base is free of the light-proof layer in the area above the light source. The base is formed, for example, from a light-transmitting material such as plastic or glass. In the area of ​​the base without the light-proof layer, the base may have, for example, an antireflection layer on its side facing the light source and / or on its side facing away from the light source, which prevents reflections from the base. In the area above the cover, the aperture is configured to be light-proof to the light source by the light-proof layer on the base.

[0036] According to at least one embodiment of the light-emitting device, the cover protrudes relative to the light source on the mounting side. In other words, the cover is, for example, thicker than the light source. In a vertical direction, for example, extending perpendicular to the mounting surface, the cover protrudes relative to the light source. In this way, the cover mechanically protects the light source from damage. However, due to this design, more light impinges on the cover than if the light source protruded relative to the cover. Therefore, the precautions described herein have proven particularly advantageous, preventing light from entering the central region of the optical element.

[0037] In the luminous devices described herein, two or more of the preventive measures described herein for preventing light from entering the central region can be combined in one luminous device. Thus, for example, the cover can be designed to direct light emitted by the light source away from the central region of the optical element, and an aperture can be arranged between the light source and the optical element, further preventing light from entering the central region.

[0038] The luminous means described herein are characterized in particular by increasing the contrast of the light intensity projected into the far field by avoiding the projection of undesired reflections into the far field, so that the projected light has a particularly high light quality.

[0039] The light-emitting device described here will be explained in more detail below with reference to embodiments and the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 、 2 , 3, 4, 5, and 6 show exemplary embodiments of the luminous means described here based on schematic sectional views.

[0041] Elements that are identical, of the same type, or perform the same function are provided with the same reference numerals in the drawings. The drawings and the size ratios of the elements shown in the drawings relative to one another are not to be considered true to scale. Rather, individual elements may be shown exaggeratedly for better visibility and / or to facilitate understanding. DETAILED DESCRIPTION

[0042] Figure 1 The schematic cross-sectional view of FIG and all the following cross-sectional views each show a portion of a luminous device. In the present case, the right half of the luminous device is shown. The left half of the luminous device is designed, for example, symmetrically with respect to its axis, wherein the axis of symmetry is perpendicular to the connection carrier 1 and extends along the left edge of the figure.

[0043] Figure 1 A schematic cross-sectional view shows a light-emitting device described herein according to a first embodiment. The light-emitting device comprises a connection carrier 1 having a mounting side 1a. The connection carrier 1 is, for example, a circuit board. The light-emitting device also comprises a light source 2. In this case, the light source 2 comprises a plurality of light-emitting diode chips 21. Each of the light-emitting diode chips 21 is, for example, a pixelated light-emitting diode chip comprising pixels 22 that can be controlled separately from one another.

[0044] The light source is mechanically fastened on the mounting side 1a and electrically connected to the mounting surface 11 of the connection carrier 1. For example, the light source can be electrically conductively connected to the connection carrier 1 via contact wires (not shown).

[0045] The light-emitting device further comprises a cover 3, which partially covers the connection carrier 2 on the mounting side 1a of the connection carrier and laterally surrounds the light source. For example, the cover completely surrounds the light source 2 in a lateral direction extending parallel to the main extension plane of the connection carrier 1. Here, the cover 3 protrudes relative to the light source 2 in a vertical direction extending perpendicular to the main extension plane of the connection carrier 1. The cover is formed, for example, from a plastic material. In particular, the cover 3 can be formed in black or in a colored color. The cover 3 covers, for example, contact wires, by means of which the light source is electrically conductively connected to the connection carrier 1. The cover 3 provides mechanical protection for the light source and other components, i.e., for example, the contact wires.

[0046] The light emitting device further comprises an optical element 4. The optical element 4 comprises a central region 41, which is arranged downstream of the light source 2 on the mounting side 1a of the connection carrier. Furthermore, the optical element 4 comprises an edge region 42 that completely surrounds the central region 41 in a lateral direction. The edge region 42 is arranged, for example, above the cover 3.

[0047] Furthermore, the luminous device comprises precautions which prevent the reflected light 6 from entering the central region 41 of the optical element 4 .

[0048] During operation, light source 2 emits light 5. This light 5 partially impinges on another component of the light-emitting device (in this case, for example, cover 3) and is reflected there. In this case, the shape of the cover is selected such that cover 3 is designed to direct the light 5 emitted by light source 2 away from central region 41 of the optical element or to reflect the emitted light so that it no longer falls within the acceptance angle of the optical system. Therefore, precautions are taken to prevent reflected light 6 from entering the central region of optical element 4.

[0049] exist Figure 1 In the exemplary embodiment, this is achieved by having a cover having a thickness D that increases in the direction away from light source 2. Furthermore, cover 3 has a reflective outer surface 3a on its side facing away from connection carrier 1, which reflects incident light in a directionally directed manner. Due to the increased thickness, outer surface 3a extends obliquely to mounting surface 11 at mounting surface 1a of connection carrier 1. This directs reflected light 6 away from central region 41.

[0050] exist Figure 2 In the embodiment of FIG, the cover 3 has a conventional shape. An optical body 7 is arranged between the light source 2 and the cover 3. This optical body directs the light 5 emitted by the light source 2 away from the central region 41 of the optical element 4. This prevents reflected light 6 from entering the central region of the optical element 4 or directs the reflected light away from the acceptance angle of the subsequent optical system. For example, the acceptance angle is 45°. The optical body 7 completely surrounds the light source in the lateral direction. The cross-section of the optical body 7 is wedge-shaped. It has a reflective, obliquely extending outer surface 7a facing away from the connection carrier 1 and directs the reflected light 6 away from the central region 41.

[0051] Alternatively, the optical body 7 can be a light guide which, by reflection, conducts the incident light 5 past the optical element 4 and out of the luminous means. This also ensures that no light is reflected into the central region 41 or that no reflected light falls within the acceptance angle of the optical system.

[0052] Another embodiment of the light emitting device described herein incorporates Figure 3 In this embodiment, different from Figure 1 In an embodiment of the present invention, a light-reflecting layer 31 is applied to the cover 3 at its outer surface 3 a. The light-reflecting layer 31 is designed to reflect the incident light 6 in a directionally directed manner, so that precautions are taken to prevent the reflected light 6 from entering the central region 41 of the optical element 4 or to prevent the reflected light from falling within the acceptance angle of the subsequent optical system.

[0053] The advantage of using a light-reflecting layer 31 is that the surface of the cover 3 does not need to be reflective, but rather reflectivity can be generated by the reflective layer 31. Therefore, the surface of the cover 3 does not need to be particularly smooth to achieve the desired reflection. Reflections from rough surfaces are less problematic when projected into the far field, as the rough surface causes the reflections to appear blurred.

[0054] Another embodiment of the light emitting device described herein incorporates Figure 4 The following is a more detailed description based on the schematic cross-sectional view. Figure 1 In an embodiment of the present invention, the device includes an aperture 8 having a base 81 and a light-proof layer 82. The aperture 8 is arranged between the light source 2 and the optical element 4 and covers the light source 2 and the cover 3. Here, the light-proof layer covers the base 81 in the area above the cover, and the base 81 does not have the light-proof layer in the area above the light source. The cover 3 can be, for example, combined with Figure 1 In addition, it can be combined with Figure 3 The reflective layer 31 described is applied to the cover. Finally, it is possible to combine Figure 2 The conventional cover described serves as the cover. Light 6 reflected at the cover is absorbed or reflected by the opaque layer 82, so that precautions are taken to prevent a portion of the reflected light 6 and / or non-reflected light 61 from entering the central region 41 of the optical element 4.

[0055] Another embodiment of the light emitting device described herein incorporates Figure 5 This will be explained in more detail using a schematic cross-sectional view. In this embodiment, the optical element 4 includes a light-absorbing layer 43 in an edge region 42 on the side of the optical element 4 facing the connection carrier 1. This edge region laterally surrounds the central region 41. The light-absorbing layer is designed to absorb a portion of the reflected light 6 and / or non-reflected light 61. This prevents a portion of the reflected light 6 and / or non-reflected light 61 from entering the central region 41 of the optical element. In the region of the optical element where the light-absorbing layer 43 is located, i.e., on the underside of the edge region 42 facing the connection carrier 1, the optical element 4 can extend, in particular, parallel to the mounting surface 11 of the connection carrier 1.

[0056] Another embodiment of the light emitting device described herein incorporates Figure 6This will be explained in more detail using a schematic cross-sectional view. In this embodiment, the optical element 4 has a light-reflecting layer 44 in an edge region 42 on the side of the optical element 4 facing the connection carrier 1. This light-reflecting layer is designed to reflect a portion of the reflected light 6 and / or non-reflected light 6. This prevents the reflected light 6 from entering the central region of the optical element 4. In the lower side of the edge region 42 of the optical element 4 facing the connection carrier 1, the outer surface of the optical element can extend obliquely with respect to the mounting surface 11 of the connection carrier 1. For example, this outer surface is at least partially parallel to the outer surface 3a of the cover 3. In this way, light reflected by the cover 3 can be directed out of the light-emitting device with particularly low reflections due to directional reflection at the reflective layer 44.

[0057] In the luminous device described here, in particular, the precautions described here for preventing light from entering the central region 41 of the optical element 4 can be combined with one another. Figure 4 The use of the diaphragm 8 shown can be combined with Figure 1 The special shape of the cover 3 shown is combined.

[0058] The present invention is not limited to the description based on these exemplary embodiments. Rather, the present invention comprises novel features and combinations of features, which in particular include combinations of features in the claims, even if this feature or this combination itself is not explicitly mentioned in the claims or exemplary embodiments.

[0059] This application claims the benefit of German patent application DE 102020101038.9, the disclosure content of which is incorporated herein by reference.

[0060] Reference Signs List

[0061] 1. Connecting carrier

[0062] 1a Mounting side of the connection carrier

[0063] 11 Mounting surface for connection carrier

[0064] 2 Light Source

[0065] 21 LED chips

[0066] 22 pixels

[0067] 3 Cover

[0068] 31 Light reflecting layer of cover

[0069] 3a Gold

[0070] 4 Optical elements

[0071] 41 Central area of ​​the optical element

[0072] 42 Edge area of ​​optical element

[0073] 43 Light-absorbing layer of optical element

[0074] 44. Light reflecting layer of optical element

[0075] 5 Light emitted by a light source

[0076] 6 Reflected Light

[0077] 61 non-reflected light

[0078] 7 Optical Body

[0079] 7a External surface of the optical body

[0080] 8 aperture

[0081] 81 matrix

[0082] 82 The opaque layer of the aperture

Claims

1. A light emitting device having a connection carrier (1) having a mounting side (1a), a light source (2) which is fastened and electrically connected to the mounting side (1a) of the connection carrier (1), a cover (3) which partially covers the connection carrier (2) on the mounting side (1a) of the connection carrier and laterally surrounds the light source (2), an optical element (4) having a central region (41) which is arranged downstream of the light source (2) on the mounting side (1a) of the connection carrier (1), wherein - taking precautions to prevent the reflected light (6) generated by the light source (2) incident on the cover (3) from being incident on the central region (41) of the optical element (4), - the optical element (4) has an edge region (42) which laterally surrounds the central region (41), - the optical element (4) is covered in the edge region (42) with a light-absorbing layer (43) designed to absorb reflected light (6) on the side of the optical element (4) facing the connection carrier (1), or with a light-reflecting layer (44) designed to reflect reflected light (6), and - said precautions are taken by said light absorbing layer (43) or said light reflecting layer (44).

2. The light emitting device according to claim 1, The cover (3) is designed to direct light (5) emitted by the light source (2) away from a central region (41) of the optical element (4).

3. The light emitting device according to claim 1 or 2, The cover (3) has a thickness (D) that increases in a direction away from the light source (2).

4. The light emitting device according to claim 1 or 2, The cover (3) has a reflective outer surface (3a) on its side facing away from the connection carrier (1).

5. The light emitting device according to claim 4, The outer surface (3a) extends obliquely to the mounting surface (11) of the mounting side (1a) of the connection carrier (1).

6. The light emitting device according to claim 1 or 2, The cover (3) has a light reflecting layer (31) on its outer surface (3a).

7. The light-emitting device according to claim 1 or 2, An optical body (7) is arranged between the light source (2) and the cover (3), and the optical body guides the light (5) emitted by the light source (2) away from the central area (41) of the optical element (4).

8. The light emitting device according to claim 1 or 2, The light absorbing layer (43) absorbs at least 90% of incident visible light.

9. The light emitting device according to claim 1 or 2, The light absorbing layer (43) is formed by an organic optical edge paint or an inorganic coating.

10. The light emitting device according to claim 1 or 2, In the region of the optical element (4) where the light-absorbing layer (43) is arranged, the optical element (4) extends parallel to the mounting surface (11) of the connection carrier (1).

11. The light emitting device according to claim 1 or 2, The light reflecting layer (44) reflects at least 85% of incident visible light.

12. The light emitting device according to claim 1 or 2, The light reflecting layer (44) is a silver or aluminum coating and / or a dielectric coating.

13. The light emitting device according to claim 1 or 2, The optical element (4) is covered with the light reflecting layer (44) in the edge region (42) on the side of the optical element (4) facing the connection carrier (1), and the outer surface of the optical element (4) extends obliquely to the mounting surface (11) of the connection carrier (1) on the side of the edge region (42) facing the connection carrier (1).

14. The light emitting device according to claim 13, The outer surface of the optical element (4) extends at least partially parallel to the outer surface (3a) of the cover (3) on the side of the edge region (42) facing the connection carrier (1).

15. The light emitting device according to claim 1 or 2, The aperture (8) is arranged between the light source (2) and the optical element (4), and the aperture covers the light source (2) and the cover (3).

16. The light emitting device according to claim 15, The aperture (8) includes a base (81) and a light-proof layer (82), wherein the light-proof layer (82) covers the base (81) in the area above the cover (3), and the base (81) does not have the light-proof layer (82) in the area above the light source (2).

17. The light emitting device according to claim 1 or 2, The cover (3) protrudes relative to the light source (2) on the installation side (1a).

18. The light emitting device according to claim 1 or 2, The light source (2) comprises two or more pixelated light emitting diode chips (21).

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