WO2002073706A1 - Appareil d'affichage et procede de fabrication correspondant - Google Patents
Appareil d'affichage et procede de fabrication correspondant Download PDFInfo
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- WO2002073706A1 WO2002073706A1 PCT/JP2002/001469 JP0201469W WO02073706A1 WO 2002073706 A1 WO2002073706 A1 WO 2002073706A1 JP 0201469 W JP0201469 W JP 0201469W WO 02073706 A1 WO02073706 A1 WO 02073706A1
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- semiconductor light
- insulating layer
- display device
- light emitting
- electrode
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H20/00—Individual inorganic light-emitting semiconductor devices having potential barriers, e.g. light-emitting diodes [LED]
- H10H20/80—Constructional details
- H10H20/81—Bodies
- H10H20/819—Bodies characterised by their shape, e.g. curved or truncated substrates
- H10H20/821—Bodies characterised by their shape, e.g. curved or truncated substrates of the light-emitting regions, e.g. non-planar junctions
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10H—INORGANIC LIGHT-EMITTING SEMICONDUCTOR DEVICES HAVING POTENTIAL BARRIERS
- H10H29/00—Integrated devices, or assemblies of multiple devices, comprising at least one light-emitting semiconductor element covered by group H10H20/00
- H10H29/10—Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00
- H10H29/14—Integrated devices comprising at least one light-emitting semiconductor component covered by group H10H20/00 comprising multiple light-emitting semiconductor components
- H10H29/142—Two-dimensional arrangements, e.g. asymmetric LED layout
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10W—GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10
- H10W90/00—Package configurations
Definitions
- the present invention relates to a display device and a method for manufacturing the same, and more particularly, to a display device in which a plurality of semiconductor light-emitting elements of minute sizes are arranged at intervals on a substrate surface and a method for manufacturing the same. Further, the present invention relates to a display device on which a semiconductor light emitting element having high luminance is arranged and a method for manufacturing the same. Background art
- Fig. 10 is a perspective view of the back side of the main part of an example.
- LEDs light-emitting diodes
- Fig. 10 is a perspective view of the back side of the main part of an example.
- the display device 100 manufactured in this way is an LED module 102. ⁇ Normally, 0.3 mm square LED chips cut out from A8 are used for each pixel, and if the entire screen of several hundred thousand pixels is totaled, a large number of compound semiconductors will be used. In addition, the arrangement, fixing, and wire bonding of these LED modules 102 Ding-to-soldering requires equipment and man-hours, which inevitably results in high costs. As shown schematically in FIG. 11, each LED chip is composed of a p-type semiconductor 106 having a P electrode 107 and an n-type semiconductor having an n electrode 109. A planar structure is adopted in which the active layers 105 are stacked in a plane so as to sandwich the active layer 105.
- the light emission generated in the active layer 105 basically travels in all directions, but mainly due to the relation between the relatively large refractive index of the semiconductor and the angle of incidence from the inside of the semiconductor to the interface (surface). Light traveling in the direction is emitted outward through the interface. Therefore, even if the light going upward (back side) is reflected by the electrode surface and the like and goes down (front side), the light emission efficiency is low, and the light emitted to the back side is also low. However, there is also a problem that the light is incident on the adjacent LED module and blurs the image on the display device.
- the present invention has been made in view of the above-described problems, and firstly, a display device and a manufacturing method thereof, in which minute semiconductor light-emitting elements are easily fixed at intervals on a substrate surface, resulting in a low cost. It is an object to provide a method. Second, it is an object of the present invention to provide a display device including a semiconductor light-emitting device having a small size and sufficient luminance, and a method for manufacturing the same. Note that Japanese Patent Application Laid-Open No. 57-45583 discloses a device in which a light emitting diode is filled with an insulating material as a display device with reduced cost and improved reliability.
- the light emitting diode used in the embodiment is a light emitting diode chip having a planar structure cut out from a wafer, and the anode electrode and the cathode electrode are attached when the light emitting diode is in a state of a plane 18. is there.
- the epoxy resin used as an insulating layer that fills the gap between the light emitting diodes aligned and fixed on the substrate is injected and cured so as to be substantially flush with the upper end surface of the light emitting diode, and the surface thereof is hardened. Is smoothed by rubbing or the like. Also, Japanese Patent Application Laid-Open No.
- 3-355568 discloses that the ratio of light transmitted through an interface between a light emitting diode having a small pn junction region and an outer transparent plastic is greatly improved. There is disclosed a light emitting diode in which the upper end side of a semiconductor portion serving as an optical path above a pn junction region is cut into a truncated pyramid shape.
- the refractive index between the light emitting diode and the surrounding transparent plastic there is a large difference in the refractive index between the light emitting diode and the surrounding transparent plastic, and the light having an incident angle of 0 degrees perpendicular to the interface and the cone angle from the point light source are, for example, 2 Light within the range of 7 degrees passes through the interface, but other light with a large incident angle is reflected at the interface and cannot exit from the inside of the light emitting diode, and disappears by repeating reflection. That is, this phenomenon is to be avoided as much as possible.
- Japanese Patent Application Laid-Open No. 11-75019 discloses a light source device using a light-emitting diode in which a 45-degree angled mirror is provided above a semiconductor chip which is a light-emitting diode. This mirror is used to bend the light coming out of the light emitting diode upward at a right angle and reflect it to the side, and to make the light from each of the blue, green and red light emitting diodes have the same optical axis. A dichroic mirror is used to reflect upwards. Disclosure of the invention
- the display device wherein the plurality of semiconductor light-emitting elements are arranged and mounted on the base surface, and the semiconductor light-emitting elements are embedded or not embedded in the first insulating layer. In a naked state, it is arranged and fixed on the substrate surface with an interval, and further covers the semiconductor light emitting element and A second insulating layer is formed on the surface, and an upper end electrode and a lower end electrode of the semiconductor light emitting element are drawn out through connection holes formed in required portions of the first insulating layer and the second insulating layer. Device.
- the semiconductor light-emitting elements are disposed on the substrate surface at an interval with or without the embedded first insulating layer, and the second insulating layer that covers them is provided. Since the electrodes are drawn out through the connection holes, the cost per unit area of the display device is significantly reduced.
- the display device dependent on claim 1, wherein the semiconductor light emitting element is disposed on the base surface, and is embedded and fixed in the first insulating layer except for the upper end and the lower end. And an upper end electrode and a lower end electrode are drawn out to the upper surface of the first insulating layer, and then drawn out to the upper surface of the second insulating layer. Further, one of the electrodes is provided on the base surface. It is a device that is guided to the connecting electrode.
- the semiconductor light emitting element is embedded in the first insulating layer to increase the size to facilitate handling, and one electrode is connected to a driving circuit on the upper surface of the second insulating layer, and the other electrode is connected to the driving circuit. Since is connected to the drive circuit on the base surface, there is no intersection of the drive circuits of both poles in the direction orthogonal to each other, and the wiring is simplified.
- the display device which is dependent on claim 1, wherein the semiconductor light-emitting element is disposed naked on the base surface and fixed, and covers the semiconductor light-emitting element to form a second insulating layer on the base surface. Is formed, and the upper end electrode and the lower end electrode are drawn out to the upper surface of the second insulating layer, and one of the electrodes is led to the connection electrode provided on the base surface. It is.
- Such a display device does not have a first insulating layer in which a semiconductor light-emitting element is embedded, and therefore requires some contrivance in handling.However, the embedding step is omitted, and one electrode is driven by a driving circuit on the upper surface of the second insulating layer. And the other electrode is Since it is connected to the drive circuit above, there is no intersection of the drive circuits of both poles in the direction orthogonal to each other, and the wiring is simplified.
- the display device which is dependent on claim 1, wherein the first insulating layer and the second insulating layer each include a polyimide resin, an epoxy resin, or a synthetic rubber, which is a polymer compound capable of forming a coating film.
- the device consists of: Such a display device can be easily formed by applying an insulating layer also to a substrate surface having a large area, thereby simplifying attachment of a semiconductor light emitting element to the substrate surface.
- the display device which is dependent on claim 1, wherein the direction in which the semiconductor light-emitting element is directed from the light-emitting region to the lower end surface on the base surface is the main light-emitting direction.
- This device has a downward reflecting surface at the top. In such a display device, the light emission of the semiconductor light emitting element is effectively directed to the lower end face by the reflection surface.
- the display device which is dependent on claim 5, wherein the semiconductor light-emitting element is formed in a pyramid shape or a truncated pyramid shape, and at least any one of the inclined surfaces has One of the devices is a reflective surface.
- the inclined surface of the polygonal pyramid or the truncated polygonal pyramid, and in the case of the polygonal truncated pyramid, the upper surface can also be used as a reflecting surface to concentrate light emission toward the lower end surface.
- the display device which is dependent on claim 6, wherein the semiconductor light-emitting element is made of a hexagonal crystal of a gallium nitride-based semiconductor, and has an active layer parallel to the (111) plane. It is a device provided. In such a display device, the luminous efficiency of the active layer parallel to the (1-101) plane of the gallium nitride-based semiconductor is high, and further, the electrode surface provided on the (1-101) plane is reflective. And exhibit excellent light emission performance.
- the display device which is dependent on claim 7, wherein the (001) surface is a lower end surface on the substrate on which the semiconductor light emitting element is grown, and (111) 1) A gallium nitride-based semiconductor crystal grown in a hexagonal pyramid shape or a hexagonal pyramid trapezoidal shape with the plane and its equivalent plane as inclined planes, parallel to the (111) plane and its equivalent plane.
- This is a device provided with an active layer.
- the active layer parallel to the (111) plane of the gallium nitride-based semiconductor has high luminous efficiency
- the electrode surface provided on the (1-101) plane has a reflective surface. The light emission is concentrated on the lower end surface side, and particularly excellent light emission performance is exhibited.
- the display device which is dependent on claim 1, is an image display device or a lighting device in which only a single-color semiconductor light-emitting element or a combination of a plurality of types of semiconductor light-emitting elements that emit different colors is arranged. Device.
- Such a display provides a bright image display or illuminator by means of a light emitting diode or a semiconductor laser.
- a method for manufacturing a display device wherein the semiconductor light emitting device is embedded in a first insulating layer, wherein the plurality of semiconductor light emitting devices are arranged and mounted on a substrate surface. Forming a required connection opening in the layer to extract an upper end electrode and a lower end electrode of the semiconductor light emitting element; and arranging the semiconductor light emitting element from which the electrode has been extracted at an interval on the substrate surface. Fixing the semiconductor light-emitting element embedded with the first insulating layer, forming a second insulating layer on the substrate surface, and forming a required connection opening in the second insulating layer.
- This is a manufacturing method comprising a step of drawing out an upper electrode and a lower electrode drawn out on the upper surface of one insulating layer.
- the method of manufacturing such a display device is such that the semiconductor light-emitting element is embedded in the first insulating layer to increase the size and facilitate handling, and the semiconductor light-emitting element is placed on the substrate surface at intervals with an interval. After that, a second insulating layer covering them is provided, and the electrodes are pulled out and driven through the connection holes formed in the second insulating layer.
- the connection to the circuit provides a display device whose cost per unit area of the display device is significantly reduced.
- the method of manufacturing a display device includes: embedding a semiconductor light-emitting element in the first insulating layer except for an upper end portion and a lower end surface; This is a manufacturing method in which both lower end electrodes are drawn to the upper surface of the first insulating layer.
- Such a method of manufacturing a display device provides a display device that facilitates drawing out the upper end electrode and avoids reduction in the light emitting surface due to drawing out the lower end electrode at the lower end surface.
- the method for manufacturing a display device according to claim 12 or claim 10 wherein the upper electrode and the lower electrode extending to the upper surface of the first insulating layer are formed on the second insulating layer. Both are manufacturing methods in which the electrode is drawn out to the upper surface of the second insulating layer and one of the electrodes is led to a connection electrode provided on the base surface. In such a method of manufacturing a display device, one electrode is connected to the drive circuit on the upper surface of the second insulating layer, and the other electrode is connected to the drive circuit on the substrate surface.
- the drive circuits do not intersect and provide a display device with simplified wiring.
- the method for manufacturing a display device wherein in the method for manufacturing a display device, a plurality of semiconductor light-emitting elements are arranged and mounted on a substrate surface, wherein the semiconductor light-emitting devices are spaced apart on the substrate surface while the semiconductor light-emitting devices are naked. Disposing and fixing the semiconductor light-emitting element; forming a second insulating layer on the substrate surface over the semiconductor light-emitting element; forming a required connection opening in the second insulating layer to form an upper end of the semiconductor light-emitting element.
- This is a manufacturing method comprising the steps of extracting an electrode and a lower electrode.
- the method of manufacturing such a display device can avoid the reduction of the light emitting surface by taking out the lower end electrode on the lower end surface of the semiconductor light emitting element, and one of the electrodes is connected to the drive circuit by the upper surface of the second insulating layer. Since the connection is made and the other electrode is connected to the drive circuit on the substrate surface, there is no intersection between the drive circuits of the two poles in directions orthogonal to each other, and the wiring is simplified.
- This is a production method using a polymer compound capable of forming a coating film including an epoxy resin or a synthetic rubber. According to such a method of manufacturing a display device, an insulating layer can be easily applied to a substrate surface having a large area, and the semiconductor light-emitting element can be easily attached to the substrate surface.
- Such a method of manufacturing a display device provides a display device in which the light emitted from the semiconductor light emitting element is effectively directed to the lower end surface by the reflection surface.
- the manufacturing method provides a display device that concentrates light emitted from the semiconductor light emitting element to the lower end surface side, with the upper surface of the polygonal pyramid or the truncated polygonal pyramid having an inclined surface and a polygonal truncated pyramid.
- the manufacturing method of the display device according to claim 18 which belongs to claim 17 includes a hexagonal crystal of a gallium nitride-based semiconductor as the semiconductor light-emitting element.
- the method is parallel to the (1-101) plane.
- This is a manufacturing method using a substrate provided with an active layer. In such a method of manufacturing a display device, a gallium nitride-based semiconductor is used.
- a display device having excellent luminous performance is provided because of high luminous efficiency in the (1-101) plane.
- the method for manufacturing a display device includes: as a semiconductor light-emitting element, a (001) plane on the growth substrate as the lower end face; A (101) plane and a plane equivalent thereto are defined as the inclined plane.
- a gallium nitride-based semiconductor crystal-grown in a hexagonal pyramid shape or a truncated hexagonal pyramid, and the (1-101) plane and its equivalent This is a manufacturing method using a substrate provided with an active layer parallel to a flat surface.
- the method for manufacturing such a display device is particularly excellent because the electrode surface provided on the (1-101) plane parallel to the active layer having high luminous efficiency serves as a reflective surface and concentrates light emission toward the lower end surface. Display device with improved light emission performance.
- FIG. 1 is a cross-sectional view showing a state in which a GaN-based semiconductor light emitting device of a minute size is embedded in a first insulating layer (epoxy resin) except for an upper end portion and a lower end surface.
- a first insulating layer epoxy resin
- Fig. 2 shows a continuation of Fig. 1 by forming a connection opening from the upper surface of the first insulating layer to the lower electrode of the GaN-based semiconductor light emitting device, and vapor-depositing or sputtering aluminum over the entire surface. After applying photolithography, This shows a state where the p-electrode at the upper end and the n-electrode at the lower end are drawn out to the upper surface of the first insulating layer.
- FIG. 3A to 3B are diagrams showing details of a GaN-based semiconductor light-emitting device crystal-grown in a hexagonal pyramid shape.
- FIG. 3A is a longitudinal sectional view
- FIG. 3B is a plan view. It is.
- FIG. 4 shows the GaN-based semiconductor light-emitting devices shown in FIG. 2 placed on a transparent substrate of a display device at fixed intervals and fixed with a transparent adhesive.
- FIG. 4 is a cross-sectional view showing a state where a second insulating layer (epoxy resin) is formed to cover the semiconductor light emitting element.
- a second insulating layer epoxy resin
- connection hole is drilled at a required place in the second insulating layer, and the P electrode and n electrode that are drawn out from the upper surface of the first insulating layer are connected to the second insulating layer.
- the P electrode is drawn out to the upper surface of the layer, and the P electrode is guided to the connection electrode on the substrate surface.
- FIG. 6 shows that the bare GaN-based semiconductor light-emitting elements, which are not embedded in the first insulating layer, are arranged on the transparent substrate of the display device at regular intervals and fixed with a transparent adhesive.
- FIG. 4 is a cross-sectional view showing a state in which a second insulating layer is formed so as to cover the a-N-based semiconductor light emitting element.
- FIG. 7 shows that, following FIG. 6, connection holes are drilled at required portions of the second insulating layer so that the p-electrode and the n-electrode of the bare GaN-based semiconductor light-emitting element are formed on the second insulating layer. This shows a state in which the n-electrode is drawn out to the upper surface and further led to the connection electrode on the substrate surface.
- FIG. 8 is a cross-sectional view of a GaN-based semiconductor light emitting device having a crystal grown in a truncated hexagonal shape.
- FIG. 9 is a perspective view of a truncated hexagonal pyramid when the GaN-based semiconductor light emitting device is grown from a rectangular mask opening long in a predetermined direction.
- FIG. 10 is a perspective view of a back surface side of a main part of a display device using a conventional light emitting diode, in which LED modules standardized to relatively large dimensions are densely arranged.
- FIG. 11 is a cross-sectional view schematically showing a light emitting diode.
- the display device and the method for manufacturing the same provide a display device in which a plurality of semiconductor light-emitting elements are arranged and mounted on a substrate surface.
- a non-embedded bare state which is arranged and fixed on the substrate surface at an interval and further covers the semiconductor light emitting element, and a second insulating layer is formed on the substrate surface
- An apparatus in which an upper end electrode and a lower end electrode of a semiconductor light emitting element are drawn out through connection openings formed in required portions of a layer and a second insulating layer, and a method of manufacturing the same.
- the semiconductor light-emitting element used in the display device may be any element that emits light when electrons and holes, which are carriers, recombine when current is injected in the forward direction at the junction between the p-type semiconductor and the n-type semiconductor.
- the material of the semiconductor light emitting device is not particularly limited.
- Semiconductors that emit light as described above include gallium nitride (G aN) that emits blue light, gallium phosphide (G a P;) that emits green light, and gallium arsenide phosphide (G aAs) that emits red light.
- GaN gallium nitride
- Ga P gallium phosphide
- GaAs gallium arsenide phosphide
- GaAs gallium arsenide phosphide
- red light red light.
- gallium-based compound semiconductors such as aluminum gallium arsenide (A 1 G a As) are also known.
- a p-type semiconductor can be obtained by doping an acceptor impurity such as Mg, Zn, or C into a crystal. It is obtained by doping a donor impurity such as Si, Ge, or Se.
- a pn junction is preferably a heterojunction, and more preferably, for example, an InGaN layer is used as an active layer.
- MOCVD metal organic compound vapor phase epitaxy
- MBE molecular beam epitaxy
- HVPE hydride vapor phase epitaxy
- Such microscopic semiconductor light-emitting devices can be used, for example, to selectively crystallize a compound semiconductor on a sapphire substrate, rather than cutting the semiconductor light-emitting device into chips from a compound semiconductor device manufactured for semiconductor light-emitting devices. Obtained relatively easily by growing.
- a semiconductor light emitting device having a size of one side of the lower end face of about 100 to 200 m or less, for example, about 10 to 50 m. If necessary, a processing for adjusting the three-dimensional shape may be performed after the crystal is grown.
- NiZAu is vapor-deposited on the p-type semiconductor of the obtained minute semiconductor light emitting device, and a p-electrode is attached thereto.
- Ti / Au is vapor-deposited on the n-type semiconductor, and an n-electrode is attached.
- the minute semiconductor light-emitting element with the electrodes attached may be placed and fixed on the substrate surface as it is, but the semiconductor light-emitting element is made to have a particularly minute shape, and the apparent size is reduced by embedding the periphery with the first insulating layer. Handling can be greatly facilitated.
- Small semiconductor light-emitting devices for example, 100 to 100 zm size
- Small semiconductor light-emitting devices (for example, 100 to 100 zm size) grown by crystal growth on the substrate surface are fixed at regular intervals (for example, pitch 100 to 300 m) on the transparent support surface.
- dicing the first insulating layer so that the minute semiconductor light emitting device exists in the center portion. This can increase the apparent size of the semiconductor light emitting device.
- the reason for leaving the upper end portion is to draw out the electrode, and that the lower end surface is used for emitting light. However, the electrode may be drawn out from the lower end surface.
- the polyimide may be broken down by irradiating the laser from the transparent support side as necessary.
- the transparent support can be easily removed.
- ultraviolet light is irradiated from the transparent support side to cure the ultraviolet-curable adhesive and lose its adhesiveness, and the transparent support is removed from the semiconductor light emitting device. Can be removed.
- the material used for the above-mentioned first insulating layer may be either an organic substance or an inorganic substance, and its type and application method are not particularly limited.However, when inorganic substance Si 0 2 ⁇ i 3 N 4 is used, The application of chemical vapor deposition (CVD) or evaporation or sputtering requires the use of organic epoxy. When a polymer compound such as silicone resin, polyimide resin, or synthetic rubber is used, the insulating layer can be easily formed by a simple coating method even when the substrate surface has a large area. It is possible to reduce the cost. In addition, a spin-on-glass film may be used as the insulating film by coating.
- CVD chemical vapor deposition
- evaporation or sputtering requires the use of organic epoxy.
- a polymer compound such as silicone resin, polyimide resin, or synthetic rubber
- the insulating layer can be easily formed by a simple coating method even when the substrate surface has a large area. It is possible to reduce the cost
- the semiconductor light emitting device embedded and diced with the first insulating layer is arranged and fixed at a further interval (for example, a pitch of 300 to 900 m) on the substrate surface and embedded with the second insulating layer.
- the electrodes are drawn out so as to facilitate connection. For example, assuming that there is a p-electrode at the upper end and an n-electrode at the lower end, a conductive metal is applied from the exposed upper end to the upper surface of the first insulating layer to apply P-electrode on the upper surface of the first insulating material.
- the electrode can be drawn out in a large area. Accordingly, when a connection opening is provided from the second insulating layer to the P electrode on the first insulating layer, displacement is unlikely to occur.
- connection opening extending from the upper surface of the first insulating layer to the n-electrode at the lower end portion is formed, the connection opening is filled with a conductive metal, and then the n-electrode is applied to the upper surface of the first insulating layer. Can be drawn out with a large area.
- the n-electrode may be drawn from the lower end surface of the semiconductor light emitting device. In this case, since the lower end surface is a light emitting surface, it is desirable to use a transparent extraction electrode so as not to hinder light emission.
- the semiconductor light-emitting element having the apparent size increased is arranged and fixed at a pitch of, for example, about 300 to 900 on a transparent substrate serving as a display panel of a display device as described above.
- the arrangement is generally performed in one or two dimensions, but may be arranged in three dimensions.
- a method similar to the method in which the apparent size of the semiconductor light emitting element is increased by the first insulating layer can be adopted. That is, a layer of the second insulating material is formed on the base surface so as to cover the semiconductor light emitting element arranged and fixed on the base surface.
- This second insulating layer is made of either inorganic or organic material.
- the same material as the first insulating layer it is preferable to use the same material as the first insulating layer. If different insulating materials are laminated and used, problems due to insufficient adhesiveness at their interface and differences in thermal expansion coefficient
- the p-electrode and the n-electrode of the semiconductor light emitting device drawn out on the upper surface of the first insulating layer are further added. It is pulled out to the upper surface of the second insulating layer and connected to each drive circuit. There are various methods for the connection.
- connection holes from the upper surface of the second insulating layer to the upper surface of the first insulating layer, one of which draws the p electrode and the other which draws the n electrode to the upper surface of the second insulating layer
- the extracted p-electrode is directly connected to the corresponding drive circuit
- the extracted n-electrode is provided with a connection opening from that portion to the connection electrode provided on the base surface, and By filling the connection opening with a conductive metal, it is possible to connect to the corresponding drive circuit on the substrate surface via the connection electrode.
- Even small-sized semiconductor light-emitting devices with a size of about 100 to 200 m can be directly transparent without being embedded in the insulating layer to increase the apparent size. It can be arranged and fixed on the substrate surface. Needless to say, a semiconductor light emitting device having a size of 100 m or less may be handled bare. In order to pick up the upper end of each bare semiconductor light emitting device and place it at a constant pitch on the substrate surface, it is necessary to use vacuum adsorption and desorption under atmospheric pressure, or adhesion with an ultraviolet curable adhesive. Means such as deactivation of adhesiveness by ultraviolet irradiation from the substrate surface side can be adopted.
- the semiconductor light-emitting elements picked up as described above are arranged and fixed at a pitch of, for example, about 300 to 900 m on the base surface on which the transparent adhesive is applied to a predetermined portion. In this case, apply a transparent adhesive to the lower end surface of the semiconductor light emitting device. You may leave. Then, the second insulating material is directly formed into a layer so as to cover the semiconductor light emitting elements which are arranged on the substrate surface and fixed by bonding. The extraction of the electrodes of the semiconductor light emitting element to the upper surface of the second insulating layer is the same as the case where the apparent size is a dog.
- the semiconductor light emitting device Depending on the shape of the semiconductor light emitting device arranged and fixed on the transparent substrate surface, it is possible to improve the brightness on the substrate surface side, that is, on the lower end surface side of the semiconductor light emitting device.
- the light emitting region (active layer) of the semiconductor light emitting element light going upward from the light emitting region can be light going toward the lower end surface with the electrode surface or the like at the upper end as a reflection surface, but the side surface perpendicular to the lower end surface Even if the light traveling toward the lower surface is reflected by the side surface, it is difficult for the light to travel toward the lower end surface. Therefore, it is desirable that the semiconductor light emitting device has an inclined surface whose angle with the lower end surface is within a range of 45 ⁇ 20 degrees.
- This inclined surface does not necessarily have to be a smooth surface such as a mirror surface. If the angle between the inclined surface and the lower end surface is out of the above range, the lower end surface can be reflected even if the light directed sideways is reflected. Since the amount of light heading toward does not increase so much, the effect of increasing the brightness becomes difficult to recognize.
- the slope may be a one-sided slope, a gabled slope, or a square-shaped slope.
- the semiconductor light emitting element has a pyramid shape or a truncated pyramid shape.
- a pyramid an inclined surface of a truncated pyramid, and a truncated polygonal pyramid, by making the upper surface also a reflecting surface, light emission of the semiconductor light emitting element can be more effectively directed to the lower end surface side.
- the pyramids or truncated pyramids mentioned here include various pyramids ranging from ⁇ pyramids, quadrangular pyramids, pentagonal pyramids, hexagonal pyramids to polygonal pyramids that approximate cones, and the corresponding pyramids.
- It may be a semiconductor light emitting device having a caldera-shaped depression as an inclined surface at the upper end.
- the semiconductor light emitting device having the inclined surface as described above may be obtained spontaneously by selective crystal growth, or may be one subjected to surface treatment after selective crystal growth.
- an inclined surface may be provided when a minute semiconductor light-emitting device is cut out from FIG. An ion beam or a laser beam can be used as a processing means for obtaining such an inclined surface.
- gallium phosphide (G a P) that emits green light, gallium arsenide phosphide (G a As P) that emits red light, aluminum gallium arsenide (A l G aA s) etc. belong to the cubic system and become hexahedral when selectively grown, and do not have an inclined surface with respect to the lower end surface as described above. It is desirable to do.
- GaN-based semiconductors that emit blue light belong to hexagonal crystal and have a hexagonal column (hexagonal column) or hexagonal pyramid (hexagonal pyramid) crystal structure.
- Japanese Patent No. 2830814 discloses that, when selective growth is performed on the (1-101) plane of a sapphire substrate, the upper surface parallel to the lower end surface has a trapezoidal cross section. It is described that the (1-101) plane, one of the slopes on both sides of the (1-101) plane is the (1-101) plane, and the other is the (0111) plane.
- the semiconductor light emitting device of the present invention includes those having the above-mentioned inclined surface.
- the GaN-based semiconductor light-emitting device has a boat-bottom shape turned upside down depending on how the sapphire substrate is grown on the (001) plane, but the semiconductor light-emitting device of the present invention has such an inclined surface.
- some light-emitting diodes which are semiconductor light-emitting elements, emit red (R), green (G), and blue (B), depending on the material. Therefore, a pixel is formed by combining these light-emitting diodes. With this configuration, a full-color image display device with high luminance can be obtained. Since it is easy to provide a semiconductor laser by providing a resonance mirror on the above-mentioned light emitting diode, it is also possible to manufacture a lighting device or a road sign using a semiconductor laser combining single colors or three primary colors.
- FIG. 1 and 2 are cross-sectional views showing steps of embedding a GaN-based semiconductor light-emitting device 11 of a small size in a polymer compound to increase the apparent size and facilitate handling. . That is, in FIG. 1, GaN-based semiconductor light-emitting elements 11 having a long side of the lower end face having a size of 100 are arranged at a pitch of 310 iim on the transparent support surface, not shown, and are not shown. After fixing with a polyimide adhesive, the insulating layer 21 is formed by applying, drying, and curing an epoxy resin solution except for the upper end and the lower end of the GaN-based semiconductor light emitting element 11, thereby forming and embedding the insulating layer 21. Indicates one piece.
- GaN-based semiconductor light-emitting device 11 The details of the GaN-based semiconductor light-emitting device 11 are provided on a (001) surface of a sapphire substrate (not shown) as shown in the cross-sectional view of FIG. 3A and the plan view of FIG. 3B.
- a buffer layer is formed at a temperature of 500 ° C. in the opening of the SiO 2 mask, and then n-type gallium nitride (G aN: S i) 12 doped with silicon at 100 ° C. is formed in a flat plate shape. and, moreover it provided to S i 0 2 to the opening of the mask 1 3 by crystal growth at 1 0 0 Ot hexagonal pyramid shaped n-type semiconductor further (G a n: S i) 1 4 is obtained.
- n GaN n GaN
- P-type gallium nitride (G aN: Mg) layer 16 is formed by further doping magnesium.
- a P-type (G aN : Mg) layer is deposited with Ni / Au on the layer 16 and a p-electrode 18 which is also a reflection surface of light emission is attached, and a flat plate (G aN: S i) 0 2 an opening provided in the mask 1 3, is prepared by attaching the n electrode 1 9 vapor wearing T i / Au.
- the semiconductor light emitting device 11 shown in FIG. 2 has an n-electrode 19 provided on the base 12 of the GaN-based semiconductor light emitting device 11 from the upper surface of the first insulating layer 21 of epoxy resin in the state shown in FIG. After forming a connection opening 22 that leads to aluminum and depositing or sputtering aluminum over the entire surface, etching is performed by lithography while leaving the main part, and the p-electrode 18 at the upper end and the n-electrode 19 at the base 12 are connected.
- a lead electrode 18 d and a lead electrode 19 d are provided respectively, and the first insulating layer 21 is set at 300 m so that the GaN-based semiconductor light-emitting element 11 is almost at the center.
- Dicing by size was performed by irradiating a laser beam from the transparent support side to break down the polyimide adhesive and remove the transparent support.
- the semiconductor light-emitting element 11 whose apparent size is increased by embedding it in this plastic emits blue light to the lower end surface side by connecting the extraction electrodes 18 d and 19 d to the drive circuit and injecting current. It can be operated as a display device that operates.
- FIG. 4 and FIG. 5 show a GaN-based semiconductor light-emitting element 11 of 300 size embedded in the first insulating layer 21 of Example 1 which is arranged at intervals on the surface of the base 31 and fixed. It is sectional drawing which shows the case where it performs. That is, FIG. 4 shows that the semiconductor light emitting element 11 buried with the first insulating layer 21 of the epoxy resin shown in FIG. 2 is coated on a transparent substrate 31 serving as a display panel of a display device. It is a figure showing the case where it is arranged and fixed at im pitch.
- connection electrodes 3 2 are provided at predetermined intervals, and the semiconductor light emitting element 1 1 buried with the first insulating layer 2 1 is fixed between the connection electrodes 3 2 with a transparent adhesive 3 3. Thereafter, a state is shown in which an epoxy resin solution is applied so as to cover the entire surface, dried, and heat-cured to form a second insulating layer 34 of epoxy resin.
- FIG. 5 shows the state of FIG. 4 from the top surface of the second insulating layer 34 to the extraction electrode 18 d of the internal GaN-based semiconductor light emitting element 11 and the connection electrode 3 on the top surface of the base 31.
- Two connection holes 35, 36 leading to 2 are provided, and a connection hole extending from the upper surface of the second insulating layer 34 to the extraction electrode 19 d of the GaN-based semiconductor light emitting device 11 as well.
- aluminum vapor deposition or sputtering is performed on the entire surface, and etching is performed by lithography while leaving the main part by lithography to form the GaN-based semiconductor light emitting device 11!
- the electrode 18 is connected to a drive circuit (not shown) on the surface of the substrate 31 and the n-electrode 19 is connected to the drive circuit (not shown) on the upper surface of the second insulating layer 34.
- the GaN-based semiconductor light emitting device 11 having such a small size and shape is embedded in the first insulating layer 21 of epoxy resin to be a semiconductor light emitting device 11 having a large apparent size, thereby facilitating handling.
- a large area of the extraction electrodes 18 d and 19 d can be provided on the upper surface of the second insulating layer 21, so that the electrode from the second insulating layer 34 made of epoxy resin is used in the subsequent step. Is easier to withdraw.
- FIGS. 6 and 7 show a small GaN-based semiconductor light-emitting device 11 buried in an insulating layer, and without being enlarged without increasing the size, on a surface of a base 31 serving as a display panel of a display device.
- FIG. 6 is a cross-sectional view showing a case where the display device is arranged and fixed at a position. That is, FIG. 6 shows the connection electrodes 3 2 provided at regular intervals on the upper surface of the base 31.
- the 100 m-sized GaN-based semiconductor light-emitting device 11 picked up by the vacuum suction chuck was picked up naked by a vacuum suction chuck, and was picked up on the upper surface of the substrate 31 at a pitch of 400 m.
- FIG. 7 shows the state of FIG. 6 from the top surface of the second insulating layer 34 made of epoxy resin to the p electrode 18 of the internal GaN-based semiconductor light emitting element 11 and the connection electrode 3 on the top surface of the base 31. 2, and three connection openings 3 5 ′, 3 6 ′, and 3 7 ′ to the n-electrode 19 of the base 12 of the GaN-based semiconductor light emitting device 11, and then aluminum
- the p-electrode 18 of the GaN-based semiconductor light-emitting device 11 is on the surface of the substrate 31 and the n-electrode 19 is a second insulating layer.
- each is connected to a drive circuit (not shown).
- the GaN-based semiconductor light-emitting elements 11 which are miniaturized and reduced in cost are arranged on the surface of the base 31 at intervals, so that the cost of the display device obtained is reduced.
- a display device is manufactured by using a hexagonal pyramid-shaped minute GaN-based semiconductor light emitting device 11 has been described.
- a display device can be used for the N-based semiconductor light-emitting element.
- Fig. 8 shows the GaN-based semiconductor grown selectively on the (001) plane of the sapphire substrate in the same manner as the hexagonal pyramid shown in Figs. 3A to 3B. It is a cross-sectional view, but if you do not take enough time, the frustum of a hexagonal pyramid is n-type (G a N: S i) The conductor 41 is obtained.
- the (001) plane which is the upper surface parallel to the lower end face of the n-type (GaN: Si) semiconductor 41, and the (111) plane corresponding to the inclined surface of a hexagonal pyramid
- An active layer 45 made of InGaN is provided on the substrate, and a p-type (GaN: Mg) semiconductor layer 46 is further grown thereon.
- Type (G a N: M g) semiconductor layer 4 6 N i ZAU only set the p-electrode 48 was deposited, S I_ ⁇ 2 mask 4 3 a flat n-type where exposed by opening (G aN: S i)
- An n-electrode 49 is provided by evaporating TiZAu on the upper surface of a semiconductor base 42.
- the inclined surface and the upper surface of the truncated hexagonal pyramid serve as the light emission reflecting surface.
- FIG. 9 is a sapphire substrate (0 0 0 1) n-type grown surface (G a N: S i) mask 5 3 S I_ ⁇ 2 provided in the semiconductor of the base portion 5 2, the mask In the rectangular opening long in the ⁇ 1-1 00> direction provided in 53.
- the GaN-based semiconductor 51 obtained by selective crystal growth has a boat-bottom shape turned upside down, and is inclined (1-1)
- the GaN-based semiconductor light-emitting element 51 having the (0 1) plane and the (1 1-2 2) plane, and having such an inclined plane, can also be used for the display device.
- the case where the (001) plane of the sapphire substrate is used as the substrate for crystal growth of the GaN-based semiconductor used in the semiconductor light emitting device has been exemplified.
- a substrate other than sapphire for example, a crystal grown using a GaN wafer or a SiC wafer may be used.
- an epoxy resin is exemplified as a material of the first insulating layer and the second insulating layer.
- a thermosetting resin such as a heat-resistant polyimide resin, and a vinyl chloride-based copolymer resin may be used.
- Synthetic rubber such as thermoplastic resin and polyurethane rubber can also be used.
- inorganic An insulating material such as silicon oxide / silicon nitride may be deposited in layers.
- Examples 1 and 2 as shown in FIGS. 3A to 3B, a G a N based semiconductor having a P-type semiconductor 16 on the upper side and an n-type semiconductor 14 on the lower side.
- the light emitting element 11 is shown, a semiconductor light emitting element in which these positions are reversed may be used.
- the semiconductor light emitting device 11 to which the p-electrode 18 and the n-electrode 19 were previously attached was used, but in FIG. 2, when the conductive metal was deposited or sputtered, the electrode was It may be provided and subsequently drawn out to the upper surface of the first insulating layer.
- the light emitting diode is taken as the semiconductor light emitting element.
- a semiconductor laser can be obtained by providing a resonator having mirror surfaces at both end surfaces of the light emitting diode, so that a monochromatic semiconductor laser can be obtained.
- lighting devices and road signs using semiconductor lasers of three primary colors can be manufactured.
- the present invention is implemented in the above-described embodiment, and has the following effects.
- the semiconductor light-emitting element is disposed on the base surface that becomes the panel surface of the display device at an interval in a state of being embedded in the first insulating layer or in a bare state. Since the electrodes are drawn out by covering them with the second insulating layer, the area occupied by the semiconductor light emitting elements per unit area of the display device is small, and the wiring is simplified, and the cost is significantly reduced. It has been done.
- the semiconductor light emitting element is embedded in the first insulating layer, the size is increased, and handling is facilitated, and one electrode is formed on the upper surface of the second insulating layer.
- the other electrode respectively correspond on the substrate surface Since the driving circuits are connected to each other, the driving circuits of both poles in directions orthogonal to each other are simplified without intersecting and the cost is reduced.
- the display device of claim 3 since a bare semiconductor light emitting element is used, a device is required for handling, but the embedding step by the first insulating layer is omitted, and one electrode is On the upper surface of the two insulating layers, the other electrode is connected to the corresponding drive circuit on the substrate surface, so that the drive circuits of both poles in directions orthogonal to each other are simplified without intersecting. I'm wearing
- the first insulating layer and the second insulating layer are formed of a polymer compound capable of forming a coating film, the insulating layer can be easily formed on a substrate having a large area. Are formed, and the cost is reduced.
- the semiconductor light emitting element since the semiconductor light emitting element has a downward reflecting surface above the light emitting area, the light from the light emitting area to the upper end of the semiconductor light emitting element is effectively prevented. To the lower end side.
- the semiconductor light emitting element is even formed in a pyramid or truncated pyramid shape, and at least one of the inclined surfaces among the surfaces of the semiconductor light emitting elements is a reflection surface.
- the light directed to the upper end of the semiconductor light emitting element is more effectively directed to the lower end face.
- the semiconductor light-emitting element is a hexagonal GaN-based semiconductor and has an active layer parallel to the (1-101) plane. It shows excellent light emission with the electrode surface provided on the 1-101) surface as a reflective surface.
- the semiconductor light emitting element has a (001) surface as a lower end surface on the substrate, and a (111) surface and an equivalent surface are inclined surfaces.
- This is a gallium nitride-based semiconductor that has been grown as a crystal and has an active layer parallel to the (1-101) plane and its equivalent plane.
- the image display device or the lighting device is configured by arranging only a single-color semiconductor light-emitting element or a combination of a plurality of types of semiconductor light-emitting elements that emit light of different colors. These devices show high brightness. ⁇
- the semiconductor light emitting element in which the embedded electrode is drawn out with the first insulating layer, is arranged and fixed on the surface of the base body at an interval, and is further fixed to the second insulating layer. Since the electrodes are drawn out by covering the layers, the area occupied by the semiconductor light-emitting elements in the display device is small, the wiring is simplified, and the cost of the display device is greatly reduced.
- the semiconductor light emitting element is embedded with the first insulating layer except for the upper end and the lower end, and then the upper end and the lower end are formed of the first insulating layer. Since it is pulled out to the upper surface, it is easy to draw out the upper end electrode, and it is possible to avoid a reduction in the light emitting surface due to drawing out the electrode from the lower end surface. Of course, the lower end electrode may be drawn out from the lower end surface by using a transparent electrode or the like.
- one of the two electrodes drawn out on the upper surface of the second insulating layer is connected to the connection electrode provided on the base surface. Both poles are connected to the drive circuit on the upper surface of the second insulating layer and the base surface, respectively, to avoid intersection of the drive circuits and to simplify the wiring.
- the semiconductor light emitting elements are arranged and fixed on the base surface at intervals, and the second insulating layer is provided to cover them, the semiconductor light emitting elements are However, since the semiconductor light emitting element occupies a small area per unit area of the display device and the step of embedding the first insulating layer is omitted, the cost is greatly reduced.
- the upper electrode and the lower electrode are drawn out to the upper surface of the second insulating layer, and one of the two electrodes is connected to the base surface. Both electrodes are connected to the drive circuit on the upper surface of the second insulating layer and the base surface, respectively, so as to avoid intersection of the drive circuits and to simplify wiring.
- the display device of claim 15 since the first insulating layer and the second insulating layer use a coatable polymer compound containing a polyimide resin or an epoxy resin, the display device can be applied to a substrate surface having a large area. Also, the insulating layer can be easily formed. The mounting of the semiconductor light emitting element on the base surface is facilitated and the cost is reduced. According to the display device of the present invention, since the semiconductor light emitting device having the downward reflecting surface above the light emitting region is used, the light from the light emitting region toward the upper end portion of the semiconductor light emitting device is effectively prevented. To the lower end.
- the semiconductor light emitting element has a pyramid shape or a truncated pyramid shape, and at least one of the inclined surfaces among those surfaces has a reflection surface. Since the light emitting element is used, light upward from the light emitting region of the semiconductor light emitting element is effectively directed to the lower end face side.
- the semiconductor light emitting element is formed of a hexagonal crystal of a GaN-based semiconductor, and provided with an active layer parallel to the (111) plane. Because of the use of an electrode, the electrode surface provided on the (1-101) plane is used as a reflecting surface to exhibit excellent light emission.
- the (001) surface is a lower end surface on the growth substrate, and the (111) surface is inclined.
- the surface is a GaN-based semiconductor crystal-grown in a hexagonal pyramid or a truncated hexagon, and an active layer is provided in parallel with the (1-101) plane. Since this is used, excellent light emission is exhibited by using the electrode surface provided on the (1-101) plane as a reflection surface.
Landscapes
- Led Device Packages (AREA)
- Led Devices (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
- Formation Of Insulating Films (AREA)
Description
Claims
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| EP02700626A EP1367654B1 (en) | 2001-03-09 | 2002-02-20 | Display apparatus and its manufacturing method |
| DE60230486T DE60230486D1 (de) | 2001-03-09 | 2002-02-20 | Display-vorrichtung und verfahren zu ihrer herstellung |
| US10/275,840 US6773943B2 (en) | 2001-03-09 | 2002-02-20 | Display unit and method of fabricating the same |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001-67238 | 2001-03-09 | ||
| JP2001067238A JP4876319B2 (ja) | 2001-03-09 | 2001-03-09 | 表示装置およびその製造方法 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2002073706A1 true WO2002073706A1 (fr) | 2002-09-19 |
Family
ID=18925620
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2002/001469 Ceased WO2002073706A1 (fr) | 2001-03-09 | 2002-02-20 | Appareil d'affichage et procede de fabrication correspondant |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US6773943B2 (ja) |
| EP (1) | EP1367654B1 (ja) |
| JP (1) | JP4876319B2 (ja) |
| KR (1) | KR100860102B1 (ja) |
| CN (1) | CN100358153C (ja) |
| DE (1) | DE60230486D1 (ja) |
| TW (1) | TWI273531B (ja) |
| WO (1) | WO2002073706A1 (ja) |
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| JP4082242B2 (ja) * | 2003-03-06 | 2008-04-30 | ソニー株式会社 | 素子転写方法 |
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- 2002-02-20 KR KR1020027014620A patent/KR100860102B1/ko not_active Expired - Lifetime
- 2002-02-20 EP EP02700626A patent/EP1367654B1/en not_active Expired - Lifetime
- 2002-02-20 CN CNB028013220A patent/CN100358153C/zh not_active Expired - Lifetime
- 2002-02-20 DE DE60230486T patent/DE60230486D1/de not_active Expired - Lifetime
- 2002-02-20 WO PCT/JP2002/001469 patent/WO2002073706A1/ja not_active Ceased
- 2002-02-20 US US10/275,840 patent/US6773943B2/en not_active Expired - Lifetime
- 2002-03-06 TW TW091104133A patent/TWI273531B/zh not_active IP Right Cessation
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| JPS5692577A (en) * | 1979-12-26 | 1981-07-27 | Fujitsu Ltd | Lighttemittinggdiode display panel |
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| JPS5752073A (en) * | 1980-09-16 | 1982-03-27 | Tokyo Shibaura Electric Co | Method of producing display unit |
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| Title |
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Also Published As
| Publication number | Publication date |
|---|---|
| EP1367654A4 (en) | 2007-04-18 |
| JP2002270898A (ja) | 2002-09-20 |
| JP4876319B2 (ja) | 2012-02-15 |
| US20030157741A1 (en) | 2003-08-21 |
| DE60230486D1 (de) | 2009-02-05 |
| KR20020093108A (ko) | 2002-12-12 |
| EP1367654A1 (en) | 2003-12-03 |
| US6773943B2 (en) | 2004-08-10 |
| CN100358153C (zh) | 2007-12-26 |
| EP1367654B1 (en) | 2008-12-24 |
| TWI273531B (en) | 2007-02-11 |
| CN1461499A (zh) | 2003-12-10 |
| KR100860102B1 (ko) | 2008-09-25 |
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