WO2022200079A1 - Optoelektronischer halbleiterchip, herstellungsverfahren und halbleiterbauteil - Google Patents
Optoelektronischer halbleiterchip, herstellungsverfahren und halbleiterbauteil Download PDFInfo
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- WO2022200079A1 WO2022200079A1 PCT/EP2022/056324 EP2022056324W WO2022200079A1 WO 2022200079 A1 WO2022200079 A1 WO 2022200079A1 EP 2022056324 W EP2022056324 W EP 2022056324W WO 2022200079 A1 WO2022200079 A1 WO 2022200079A1
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Definitions
- An optoelectronic semiconductor chip is specified.
- a manufacturing method for such semiconductor chips and a semiconductor component with such semiconductor chips are specified.
- One problem to be solved is to specify an optoelectronic semiconductor chip that can be mounted efficiently and precisely.
- This task is, inter alia, by an optoelectronic semiconductor chip, by a
- the semiconductor chip comprises a semiconductor layer sequence having a bottom side.
- the bottom side can be planar and flat. Opposite the bottom side is in particular an emission side, on which at least a predominant part of the radiation that is generated in the semiconductor layer sequence is emitted.
- the bottom side is, for example, a main side, that is to say a largest side, of the semiconductor layer sequence.
- the semiconductor layer sequence has at least one active zone which is set up to generate or to detect radiation when the semiconductor chip is in operation. If the semiconductor chip is set up to generate radiation, then the radiation generated is preferably incoherent and is in particular visible light such as blue light, green light and/or red light.
- the semiconductor layer sequence is preferably based on a III-V compound semiconductor material.
- the semiconductor material is, for example, a nitride compound semiconductor material such as Al n In ] __ nm Ga m N or a phosphide compound semiconductor material such as Al n In ] __ nm Ga m P or an arsenide
- Compound semiconductor material such as Al n In ] __ nm Ga m As or such as Al n Ga m In ] __ nm AspP ] __p, where 0 ⁇ n ⁇ 1, 0 ⁇ m ⁇ 1 and n + m ⁇ 1 and 0 ⁇ k ⁇ 1 is.
- 0 ⁇ n ⁇ 0.8, 0.4 ⁇ m ⁇ 1 and n+m ⁇ 0.95 and also 0 ⁇ k ⁇ 0.5 applies to at least one layer or to all layers of the semiconductor layer sequence.
- the semiconductor layer sequence can have dopants and additional components.
- the semiconductor chip includes a bottom coating on the bottom side.
- the floor covering can be formed from a single material or is composed of several components or layers.
- the floor coating is preferably at least partially electrically conductive.
- the bottom coating comprises, for example, a transparent conductive oxide, TCO for short, such as ITO or zinc oxide, or at least one metal such as Al, Ag and/or Au.
- the semiconductor chip comprises an electrode layer on one of Semiconductor layer sequence facing away from the bottom of the floor coating.
- the electrode layer can be located directly on the underside.
- the electrode layer is preferably a metallic layer and comprises, for example, Al, Ag and/or Au.
- the electrode layer can be provided with at least one coating, for example with TiW or TiWN.
- the floor coating has a thickness gradient. That is, a thickness of the floor covering varies across the floor covering.
- the floor covering has one or more ridge lines.
- the at least one ridge line is located in particular at a point where the floor coating is thickest.
- the crest line is designed similar to a ridge.
- the electrode layer extends beyond the at least one ridge line. This means that the at least one comb line is not a tear line for the electrode layer, rather the electrode layer preferably enables an electrically conductive connection across the at least one comb line.
- an electrical contact side of the electrode layer which is remote from the semiconductor layer sequence conforms to the shape of the bottom coating.
- the contact side can have the same shape as the bottom coating. This applies, for example, with a maximum tolerance of 50% or 25% or 10% of a maximum thickness of the floor coating.
- an electrical and mechanical contact plane of the contact side is defined parallel to the bottom side by the at least one ridge line.
- the ridge line which is shaped true to shape by the electrode layer means that the semiconductor chip can be mounted in a controlled orientation.
- the bottom side is aligned parallel to a carrier mounting side of a carrier on which the semiconductor chip is mounted.
- the optoelectronic semiconductor chip comprises a semiconductor layer sequence with a bottom side.
- a floor coating is located on the bottom side.
- An electrode layer is attached to an underside of the bottom coating that is remote from the semiconductor layer sequence.
- the floor covering has a thickness gradient and at least one ridgeline where the floor covering is thickest.
- the electrode layer extends over the at least one ridge line, so that a contact side of the electrode layer facing away from the semiconductor layer sequence conforms to the shape of the bottom coating.
- An electrical and mechanical contact plane of the contact side is defined parallel to the bottom side by the at least one ridge line.
- a contact pad on the underside with an annular storage structure is described in order to achieve an improved mechanical and electrical connection to be able to produce.
- the principle described here can be applied to all types of connection of a semiconductor chip to a carrier, but in particular to bonded semiconductor chips.
- the semiconductor chip can be both an emitter and a sensor.
- the semiconductor chip is provided for installation in a display.
- the semiconductor chip can be used specifically in applications that benefit from a defined emission direction of the semiconductor chip.
- Precisely aligning the emission directions of semiconductor chips, such as LEDs, sensors or pLEDs, relative to each other can be comparatively challenging, especially in cases of direct-viewed displays, where identical emission patterns as possible are required for all LEDs or pLEDs, both within a RGB pixel and between the pixels.
- the special contact pad structure described here is particularly advantageous when an adhesive, such as an electrically non-conductive adhesive, is used to mechanically attach the semiconductor chips in order to achieve a high level of performance for the overall system.
- Semiconductor chips with flat contact pads tend to tilt slightly when glued. This can be prevented with the contact structure described here by providing the semiconductor chips, for example, with a contact edge that is annular in plan view, so that an electrical contact can be better defined through a non-conductive, dielectric adhesive.
- the contact edge can make the glue easier penetrate
- the orientation of the semiconductor chip will be precisely defined by such a ring structure, since a support surface can be set precisely. In other words, tilting of the semiconductor chip during assembly can be avoided.
- the floor coating has exactly one ridge line.
- the crest line is preferably a closed line.
- the ridgeline may be an open line, that is, the ridgeline may have two ends, or in the case of a branched ridgeline, more than two ends.
- the ridge line or at least one of the ridge lines is a circle, seen in plan view of the bottom side.
- the crest line in question can also be designed as an ellipse, as a rectangle, as a polygon or as an arc triangle when viewed from above. If there are several comb lines, they can be arranged concentrically around one another.
- the floor coating comprises one or more base bodies.
- the at least one base body is preferably located directly on the bottom side.
- the floor covering comprises one or more stepped layers.
- the at least one step layer is located in particular directly on a valley side of the base body that is remote from the semiconductor layer sequence.
- the valley side is free of the stepped layer in a central area. This means that the stepped layer then only partially covers the base body, in particular only on an outer edge.
- the stepped layer runs all around the central area, in particular in a closed line.
- the at least one ridgeline is preferably defined by the at least one step layer.
- the crest line is where the step line ends towards the central area and/or falls or runs out with a step towards the central area.
- the ridge line or at least one of the ridge lines delimits the central area. It is possible for the entire central area of the bottom coating to be closer to the bottom side of the semiconductor layer sequence than the ridge line. That is, the valley side may lie within a crater-like structure framed by the ridge line. The corresponding at least one ridge line therefore protrudes beyond the central region in the direction away from the semiconductor layer sequence.
- the central area makes up at least 5% or at least 10% or at least 20% or at least 40% or at least 70% of the bottom side, seen in plan view of the bottom side. That is, the ridgeline can frame or encircle a comparatively large area. It is also possible that the central area covers at most 90% or at most 75% of the
- the at least one base body is made of an electrically conductive material.
- the base body is metallic and made of Ag or Al or Au, for example.
- the base body is made of a TCO.
- the base body is preferably made of exactly one material, but can alternatively also be composed of several materials.
- the at least one step layer is made of a dielectric material, for example made of at least one oxide such as aluminum oxide and/or silicon oxide.
- the step layer is of an electrically conductive material, such as a TCO, or is a metallic layer.
- the stepped layer can be composed of several sub-layers. For example, the step layer is then a mirror layer and/or a barrier layer against moisture penetration.
- the at least one stepped layer has a consistent, constant layer thickness in regions in which it is present. This means that the stepped layer is applied to the base body without a targeted variation in thickness.
- the layer thickness of the stepped layer is at least 20 nm or at least 50 nm. Alternatively or additionally, the layer thickness is at most 3 ⁇ m or at most 0.5 ⁇ m or at most 0.2 ⁇ m or at most 100 nm that is, the step layer can be relatively thin.
- the floor coating has a maximum thickness of at least 50 nm or at least 100 nm.
- the maximum thickness is at most 3 gm or at most 1.0 gm or at most 0.7 gm or at most 0.5 gm or at most 0.3 gm.
- the base body is convexly curved throughout. This means that viewed in cross section, the base body can be designed in the form of a converging lens. A maximum thickness of the base body is preferably present in the central area.
- the floor coating seen in cross section, is only curved in an edge region and is otherwise oriented parallel or approximately parallel to the floor side.
- the step layer can be limited to the edge area.
- the electrode layer completely covers the bottom coating.
- the electrode layer only partially covers the bottom coating.
- the semiconductor chip is a gLED.
- an edge length of the bottom side seen in plan view is at least 1 gm or at least 3 gm and/or at most 0.2 mm or at most 100 gm or at most 30 gm or at most 20 gm or at most 10 gm.
- the edge length is between 1 gm and 10 gm inclusive.
- the floor coating has, starting from the at least one ridge line, towards the edges of the floor side monotonically or strictly monotonically decreasing thickness. It is possible that the floor coating extends to the edges or close to the edges, seen in plan view of the floor side. Likewise, the bottom coating can extend onto at least one side area of the semiconductor layer sequence, that is to say go beyond the edges. Close to the edges means, for example, that a distance from the floor coating to the associated edge is at most 2 gm or at most 1 gm or at most 500 nm or at most 100 nm.
- the electrode layer has a constant thickness, in particular in the central region.
- a local thickness is in particular a smallest distance between two mutually opposite main sides of the electrode layer at a specific point of the electrode layer, with one of these main sides preferably being the contact side. It is also possible that the thickness of the electrode layer also decreases towards its edges, so that the electrode layer can become thin and has a decreasing thickness at the edges.
- the semiconductor chips are provided for electrical contacting on both sides. That is, a first electrical contact is made through the bottom side and a second electrical contact is made through the emission side.
- the semiconductor chips can be flip chips.
- the contact plane can be laid through the highest points of the two electrical contacts on the bottom side, that is, both ridge lines separately define planes that do not need to match the jointly defined plane, for example because the optoelectronic semiconductor chip is bent and the two electrical contacts are tilted relative to one another. Thus, the optoelectronic semiconductor chip would then rest, for example, on the ridge lines of the outer sides of the corresponding electrical contacts.
- the method is used to produce at least one optoelectronic semiconductor chip and comprises the following steps, in particular in the order given:
- a semiconductor device with at least one semiconductor chip as in connection with one or more of described above embodiments specified.
- Features of the semiconductor chip are therefore also disclosed for the semiconductor component and vice versa.
- the semiconductor component comprises one or more optoelectronic semiconductor chips and a carrier and a connecting means, which is a solder or an adhesive, for example.
- the optoelectronic semiconductor chips are attached to a preferably flat carrier mounting side of the carrier with the connecting means, the bottom sides preferably being oriented parallel to the carrier mounting side.
- the electrode layers are pressed by the connecting means up to the carrier mounting side, so that the orientations of the bottom sides are defined by the ridge lines.
- the bottom sides are all aligned parallel to one another due to the ridge lines of the individual semiconductor chips.
- the semiconductor component is a red-green-blue display.
- the semiconductor component then comprises at least 10 ⁇ or at least 10 ⁇ or at least 10 ⁇ of the optoelectronic semiconductor chips.
- FIG. 9 shows a schematic sectional illustration of an area around a ridge line of an exemplary embodiment of an optoelectronic semiconductor chip described here,
- FIGS. 14 to 17 show schematic sectional illustrations of exemplary embodiments of optoelectronic semiconductor chips described here.
- Figure 18 is a schematic sectional views of a
- FIGS. 1 An exemplary embodiment of a production method for optoelectronic semiconductor chips 1 is shown in FIGS.
- a semiconductor layer sequence 2 is provided.
- the semiconductor layer sequence 2 is based, for example, on the AlInGaN material system.
- the semiconductor layer sequence 2 is preferably already separated from a wafer, but can alternatively still be part of a wafer, so that separation can only take place in a subsequent method step that is not shown, for example only after the step in Figure 4.
- FIG. 1 also illustrates that a base body 31 of a bottom coating 3 is applied to a bottom side 20 of the semiconductor layer sequence 2 .
- the bottom side 20 lies opposite an emission side 25 of the semiconductor layer sequence 2 .
- the bottom side 22 is flat, for example.
- the base body 31 does not reach up to the edges 22 of the bottom side 22 .
- the base body 31 is designed in the shape of a lens, for example in the shape of a segment of a sphere.
- a maximum thickness of the base body 31 is, for example, between 0.1 ⁇ m and 0.3 ⁇ m inclusive.
- a valley side 34 of the base body 31 facing away from the semiconductor layer sequence 2 can thus be continuously curved.
- the shape of the base body 31 can be adjusted, for example, with a mask layer 5 that overhangs towards the base body 31 and has a greater thickness than the base body 31.
- the curved shape of the valley side 34 results in particular from shadowing effects on the mask layer 5 when a material is applied of the base body 31.
- the base body 31 is made of, for example, Ag, Al or Au, which is evaporated. According to FIG. 2, a starting layer 32 ′ for a step layer 32 is applied to the base body 31 .
- the starting layer 32′ is preferably applied to the valley side 34 of the base body 31 true to shape, so that the starting layer 32′ has the same cross-sectional shape as the base body 31, only enlarged and/or shifted.
- the same mask layer 5 can be used as for the base body 31.
- the starting layer 32' is preferably thin, for example with a thickness of at least 20 nm and/or at most 100 nm.
- the starting layer 32' is made of a dielectric material such as silicon dioxide and/or aluminum oxide.
- the starting layer 32' and the base body 31 are each formed from only a single material. Starting layers 32' and base bodies 31 composed of several partial layers and/or materials are also possible, as in all other exemplary embodiments.
- the starting layer 32' is structured to form a stepped layer 32, for example with the aid of a further mask layer, not drawn.
- the valley side 34 is thus uncovered in a central region C.
- the stepped layer 32 remains in a peripheral edge region E and completely covers the base body 31 there.
- a floor coating 3 is thus composed of the step layer 32 and the base body 31 .
- Central area C results in a thickest part of the Bottom coating 3 along an edge of the exposed central region C. This thickest point forms a ridgeline 33.
- the step layer 32 terminates towards the central region 33 at or near the ridgeline 33.
- an electrode layer 4 is applied to the bottom coating 2 .
- the electrode layer 4 is preferably a metallic layer, for example made of Ag, Al and/or Au.
- a thickness of the electrode layer 4 is, for example, at least 30 nm or at least 50 nm and/or at most 0.25 ⁇ m or at most 120 nm.
- the electrode layer 4 molds over the bottom coating 2 true to form, so that a contact side 40 of the electrode layer 4 that faces away from the semiconductor layer sequence 2 has the same shape or basic shape as the underside 30 of the bottom coating 3.
- the electrode layer 4 is preferably a continuous, uninterrupted layer that has the ridge line 33 overmolded without demolition.
- the electrode layer 4 has a constant layer thickness, for example, it being possible for the electrode layer 4 to extend over the ridge line 33 with a constant thickness. It is possible that the electrode layer 4 becomes thinner towards the outer edges of the bottom coating 3 and thus runs out.
- the resulting optoelectronic semiconductor chip 1 is in particular a pLED. This means that the semiconductor chip 1 is set up to generate light and the bottom side 20 has an edge length or an average edge length of between 1 ⁇ m and 30 ⁇ m inclusive.
- a thickness of The semiconductor layer sequence 2 perpendicular to the bottom side 20 is, for example, between 0.5 mpi and 5 mpi inclusive, in particular between 1.0 mpi and 2.5 mpi inclusive.
- FIGS. 5 to 8 A further exemplary embodiment of the production method is illustrated in FIGS. The steps of FIGS. 5 to 8 are carried out as explained in connection with FIGS. 1 to 4.
- valley side 34 is flat in central region C and is oriented parallel to bottom side 20; this applies, for example, to at least 70% or to at least 85% of an area of the central area C.
- the valley side 34 like the underside 30, is curved.
- the entire valley side 34 in the central region C is preferably closer to the bottom side 20 than the ridge line 33.
- FIG. 9 shows a detailed view of the area around the ridge line 33, as illustrated in FIGS. 4 or 8, for example.
- the contact side 40 preferably has a kink or a curve with a relatively small radius.
- the contact side 40 can be wedge-shaped at the ridge line 33, seen in cross-section.
- the contact side 40 In a direction away from the central region C, the contact side 40 preferably has an angle A to a Contact level P up.
- the contact plane P is defined by the ridge line 33 and runs through points on the contact side 40 that are furthest away from the semiconductor layer sequence 2.
- the contact plane P is oriented parallel to the bottom side 20, for example with a tolerance of at most 1.5° or at most 0.5° or at most 0.2°.
- the angle A is preferably more than 0°, for example at least 0.3° or at least 1.2° and/or at most 6° or at most 4°. This preferably also applies to all other exemplary embodiments.
- the step layer 32 has an end face 35 that runs obliquely to the valley side 35, for example at an angle B of at least 45° and/or at most 80°, in particular between 50° and 70° inclusive. This means that the end face 35 is then not oriented perpendicularly to the valley side 34 . This makes it easier for the electrode layer 4 to overshape the crest line 33 and the end face 35, since excessively steep slopes on the underside 30 can be avoided.
- exactly one ridge line 33 is formed by a closed line, in particular a closed circular line.
- the central area C is a circular area.
- a diameter of the central region C is, for example, at least 30% and/or at most 70% of a shortest edge length L of the bottom side 20.
- a stable support surface for the semiconductor chip 1 can thus be achieved by the ridge line 33.
- the floor coating 3 can also be circular in shape.
- a difference in the diameter of the central area C and the edge area E is, for example, at least 5% or at least 10% and/or at most 20% or at most 10% of the shortest edge length L.
- FIG. 10 illustrates that the entire bottom side 20 can be covered by the electrode layer 4 .
- the electrode layer 4 can reach up to the edge 22 of the bottom side 20 .
- the electrode layer 4 ends at a distance from the edge 22.
- the crest line 33 is designed as a closed arc triangle, with individual arcs of a circle being formed in contact points U and in a convex shape.
- This design of the crest line makes it possible for exactly three support points U to come about, so that the contact plane P can be clearly defined.
- the floor coating 3 is, for example, again designed to be circular and/or in the shape of a segment of a sphere.
- FIG. 12 illustrates that there are two ridge lines 33 which are separated from one another by an intermediate area D and which are surrounded by the common edge area E.
- the ridge lines 33 can be arranged concentrically.
- the contact side 40 is closer to the bottom side 20 than in the ridge lines 33.
- the ridge lines 33 are straight line segments that run parallel to one another, for example.
- Each of the ridge lines 33 can be assigned its own floor coating 3 .
- the floor coverings 3 are designed, for example, in the shape of a semicircle. In this configuration, the floor coatings 3 can rise towards the edges 22 which are associated with the ridge lines 33 in each case, that is to say have an increasing thickness towards the relevant edge 22 . Otherwise, the comments on Figures 10 to 12 apply in the same way to Figure 13.
- FIGS. 10 to 13 can be used for all the sectional views shown.
- Floor coating 3 designed in one piece and circular.
- the central area C is free of the floor coating 3.
- the floor covering 3 has a triangular shape when viewed in cross section. This means that at least in the edge area E, the underside 30 can run in the form of straight line sections.
- the electrode layer 4 is optionally flattened in the area of the ridge line 33 .
- Such a flattened area of the contact side 40 can also be present in all other exemplary embodiments.
- the flattened area has a width of at least 1% or at most 5% of the minimum edge length L, seen in cross-section through a center point of the bottom side 20 .
- FIG. 16 shows that the stepped layer 32 of the bottom coating 3 can extend beyond the edge 22 onto the side surfaces of the semiconductor layer sequence 2.
- the step layer 32 can serve as passivation of the semiconductor layer sequence 2 .
- the step layer 32 in FIG. 17 already ends at a distance from the edge 22 .
- the step layer 32 and the electrode layer 4 can end equidistant from the edge 22 so that the bottom coating 3 and the electrode layer 4 can be in register with each other.
- FIG. 8 An exemplary embodiment of a semiconductor component 8 is shown in FIG.
- the semiconductor component 8 comprises a multiplicity of the semiconductor chips 1, as described in connection with FIGS.
- the semiconductor chips 1 are mounted on a common carrier 81, the carrier 81 having a flat carrier mounting side 80 for this purpose. Conductor tracks and electrical connection surfaces can be located on the carrier mounting side 80, not shown.
- the semiconductor chips 1 are attached to the carrier mounting side 80 by means of a mechanical connecting means 82 .
- the connecting means 82 is, for example, an electrically non-conductive adhesive, such as a photoresist.
- the semiconductor chips 1 are mounted, for example, by being pressed onto the carrier 81 through the connecting means 82 . This is facilitated by the relatively sharp edges of the contact sides 40 in the region of the ridge lines 33 . In addition, bearing surfaces defined by the ridge lines 33 are ensured.
- the ridge lines 33 ensure, even with such a shrinking or shrinking, that an alignment of the semiconductor chips 1 with defined emission directions is maintained.
- the semiconductor chips 1 form, for example, red-green-blue pixels, also referred to as RGB pixels. This means that red, green and blue emitting semiconductor chips 1 can be combined with one another. The corresponding emission color comes about, for example, directly through the respective semiconductor layer sequence 2 or by means of a phosphor, not shown.
- the filling material 83 is, for example, white in order to ensure a high radiation efficiency, or black in order to achieve a high contrast. Further cover layers cannot be applied to all semiconductor chips 1 and to the optional filling material 83 drawn, for example, to protect the semiconductor chip 1 mechanically, electrically and / or chemically.
- the semiconductor chips 1 are, for example, chips to be contacted on both sides. That is, the emission sides 25 can be electrically connected by means of electrical connection means 85, such as bond wires. Alternatively, the semiconductor chips 1 can be designed as flip chips. The same applies to all other exemplary embodiments.
- the components shown in the figures preferably follow one another in the specified order, in particular directly one after the other, unless otherwise described. Components that are not touching in the figures are preferably at a distance from one another. If lines are drawn parallel to one another, the associated areas are preferably also aligned parallel to one another. In addition, the relative positions of the drawn components in the figures are correctly represented unless otherwise indicated.
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Abstract
Description
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Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US18/551,780 US20240170611A1 (en) | 2021-03-25 | 2022-03-11 | Optoelectronic semiconductor chip, manufacturing method and semiconductor component |
| CN202280030543.0A CN117280449A (zh) | 2021-03-25 | 2022-03-11 | 光电子半导体芯片,制造方法和半导体器件 |
| KR1020237036009A KR20230159867A (ko) | 2021-03-25 | 2022-03-11 | 광전자 반도체 칩, 제조 방법 및 반도체 부품 |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102021202920.5A DE102021202920A1 (de) | 2021-03-25 | 2021-03-25 | Optoelektronischer halbleiterchip, herstellungsverfahren und halbleiterbauteil |
| DE102021202920.5 | 2021-03-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2022200079A1 true WO2022200079A1 (de) | 2022-09-29 |
Family
ID=80953405
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/EP2022/056324 Ceased WO2022200079A1 (de) | 2021-03-25 | 2022-03-11 | Optoelektronischer halbleiterchip, herstellungsverfahren und halbleiterbauteil |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20240170611A1 (de) |
| KR (1) | KR20230159867A (de) |
| CN (1) | CN117280449A (de) |
| DE (1) | DE102021202920A1 (de) |
| WO (1) | WO2022200079A1 (de) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080093738A1 (en) * | 2006-10-19 | 2008-04-24 | Novatek Microelectronics Corp. | Chip structure and wafer structure |
| US20170133567A1 (en) * | 2015-07-30 | 2017-05-11 | Citizen Electronics Co., Ltd. | Semiconductor device and light-emitting apparatus |
| US20190172987A1 (en) * | 2015-12-31 | 2019-06-06 | Epistar Corporation | Light-emitting device having dissimilar first and second light-emitting angles |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10340256B2 (en) | 2016-09-14 | 2019-07-02 | Innolux Corporation | Display devices |
| JP6366799B1 (ja) | 2017-02-10 | 2018-08-01 | ルーメンス カンパニー リミテッド | マイクロledモジュール及びその製造方法 |
-
2021
- 2021-03-25 DE DE102021202920.5A patent/DE102021202920A1/de not_active Withdrawn
-
2022
- 2022-03-11 US US18/551,780 patent/US20240170611A1/en active Pending
- 2022-03-11 KR KR1020237036009A patent/KR20230159867A/ko active Pending
- 2022-03-11 WO PCT/EP2022/056324 patent/WO2022200079A1/de not_active Ceased
- 2022-03-11 CN CN202280030543.0A patent/CN117280449A/zh active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080093738A1 (en) * | 2006-10-19 | 2008-04-24 | Novatek Microelectronics Corp. | Chip structure and wafer structure |
| US20170133567A1 (en) * | 2015-07-30 | 2017-05-11 | Citizen Electronics Co., Ltd. | Semiconductor device and light-emitting apparatus |
| US20190172987A1 (en) * | 2015-12-31 | 2019-06-06 | Epistar Corporation | Light-emitting device having dissimilar first and second light-emitting angles |
Also Published As
| Publication number | Publication date |
|---|---|
| CN117280449A (zh) | 2023-12-22 |
| US20240170611A1 (en) | 2024-05-23 |
| KR20230159867A (ko) | 2023-11-22 |
| DE102021202920A1 (de) | 2022-09-29 |
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