WO2006003931A1 - 発光装置、照明、表示装置用バックライトユニット及び表示装置 - Google Patents
発光装置、照明、表示装置用バックライトユニット及び表示装置 Download PDFInfo
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- WO2006003931A1 WO2006003931A1 PCT/JP2005/011940 JP2005011940W WO2006003931A1 WO 2006003931 A1 WO2006003931 A1 WO 2006003931A1 JP 2005011940 W JP2005011940 W JP 2005011940W WO 2006003931 A1 WO2006003931 A1 WO 2006003931A1
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- light
- light emitting
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- emitted
- emitting unit
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
- H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
- H01L33/502—Wavelength conversion materials
- H01L33/504—Elements with two or more wavelength conversion materials
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/58—Optical field-shaping elements
- H01L33/60—Reflective elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/1336—Illuminating devices
- G02F1/133602—Direct backlight
- G02F1/133603—Direct backlight with LEDs
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/48—Structure, shape, material or disposition of the wire connectors after the connecting process of an individual wire connector
- H01L2224/4805—Shape
- H01L2224/4809—Loop shape
- H01L2224/48091—Arched
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/30—Technical effects
- H01L2924/301—Electrical effects
- H01L2924/3025—Electromagnetic shielding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
Definitions
- the present invention relates to a light emitting device, illumination, a backlight unit for a display device, and a display device.
- cold cathode fluorescent lamps and the like have been used as light sources such as lighting and backlights for liquid crystal displays.
- a pseudo-white light source has been developed that combines a light source that emits blue light with a substance that absorbs blue light and emits yellow light.
- an InGaN-based light emitting diode is used as a light source that emits blue light
- yttrium aluminate to which cerium is added is used as a substance that emits yellow light.
- the light spectrum emitted by the pseudo-white light source essentially lacks the green light component and the red light component, so that the pseudo-white light source has low color rendering and low color reproducibility.
- the yttrium aluminate component is adjusted to emit yellow-green light, and in addition to this, a substance that absorbs blue light and emits red light is added to yttrium aluminate.
- a substance that emits red light is not only blue light but also light having a longer wavelength than blue light but a shorter wavelength than red light, such as green and yellow. Many of them also absorb light. Examples of such materials include sulfides of alkaline earth metals activated with europium, alkaline earth metals and silicon nitrides activated with europium, alkaline earth metals and silicon oxynitrides activated with europium Such as things. These substances usually absorb light with a wavelength of 400 nm to 580 nm well and emit orange to red light having a peak at 580 nm to 680 nm.
- Substances that emit orange to red light as typified above absorb green to yellow light having a shorter wavelength than that, and therefore substances that emit orange to red light and green to red light. Things that emit yellow light When mixed with quality, some of the light emitted by substances that emit green to yellow light is absorbed by substances that emit orange to red light! This significantly reduces the luminous flux of the light emitting device.
- a display device that clearly displays an image of an image forming unit by irradiating an image forming unit on which an image is formed with a back light.
- Examples of such display devices include liquid crystal displays that use liquid crystal units as image forming units, and internal lighting signs that illuminate signs (image forming units) with internal lighting (emergency exit indicators, road signs, etc.) Etc.
- These display devices usually have a backlight unit for irradiating the image forming unit with backlighting light.
- a backlight unit for irradiating the image forming unit with backlighting light.
- a fluorescent lamp or a cold cathode tube has been used as such a backlight unit.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2004-71726
- a light emitting device such as a pseudo-white light source having a light source that emits blue light and a substance that absorbs blue light and emits yellow light has high luminous efficiency but has insufficient color rendering. .
- a knocklight is used in order to display the color of the image formed on the image forming unit with good reproducibility (that is, to improve color reproducibility).
- the white light used is preferably light containing the three primary colors of light.
- the three primary colors of light are red, blue and green. According to this point of view, a conventional light emitting device using a light source that emits blue light and a fluorescent material that emits yellow light has insufficient red and green light, so color reproducibility is not sufficient.
- the present invention has been made in view of the above problems, and improves the light emission efficiency and color rendering of a light-emitting device having two or more light-emitting substances that absorb light and emit light, and
- An object of the present invention is to provide illumination using a light emitting device, a backlight unit for a display device, and a display device, and to provide a display device having excellent color reproducibility using a backlight unit having high light emission efficiency. .
- the inventors of the present invention have intensively studied to solve the above problems, and as a result, in a light-emitting device using two or more kinds of light-emitting substances, the light emitted from one light-emitting substance changes the other light-emitting substance. By preventing the incident light from entering the included region, the amount of light emitted from one light-emitting substance is absorbed by the other light-emitting substance, and as a result, the light emission efficiency and color rendering of the light-emitting device can be improved. And gained knowledge.
- a backlight unit that emits white light includes a blue light source that emits blue light and a green light emission that is excited and emitted by the blue light.
- the light-emitting device of the present invention contains a light source and at least one light-emitting substance that can emit light containing a component having a longer wavelength than the light emitted from the light source when excited by the light emitted from the light source.
- a light-shielding portion that prevents at least part of the light emitted by the first light-emitting portion from entering the second light-emitting portion (Claim 1).
- the light shielding part reflects at least a part of the light emitted from the first light emitting part (Claim 2).
- the light emitted from the first light emitting unit can be used effectively, and the light emission efficiency and color rendering of the light emitting device can be further improved.
- the illumination of the present invention is characterized by using the above light emitting device (claim 3). Furthermore, the backlight unit for a display device of the present invention is characterized by using the above light emitting device (claim 4).
- the display device of the present invention uses the above light-emitting device (Claim 5).
- another display device of the present invention forms a video image on the surface side by irradiating the backlight unit emitting a backlight and the backlight emitted from the knock light unit to the back side.
- a display device including an image forming unit, wherein the backlight unit is capable of emitting at least one light source and light containing a component having a longer wavelength than the light emitted from the light source when excited by the light emitted from the light source.
- a first light-emitting part containing a light-emitting substance of a kind and at least partly formed independently from the first light-emitting part, and excited by light emitted from the light source and the first light-emitting part, the first light-emitting part And a second light-emitting part containing at least one light-emitting substance capable of emitting light containing a component having a wavelength longer than that of the emitted light (claim 6).
- another display device of the present invention includes a backlight unit that emits white light, and the white light emitted from the knock light unit is irradiated on the back side to form an image on the front side. And a green light emitting device that emits green light.
- the display device includes a blue light source that emits blue light and a green light emitter that emits light when excited by the blue light.
- a red light-emitting part that has a red light-emitting body that is formed at least partially independently from the green light-emitting part and that emits light when excited by the blue light, and emits red light. (Claim 7). This also improves both the luminous efficiency and color reproducibility of the display device.
- the display device preferably includes a diffusion plate that diffuses light emitted from the backlight unit between the backlight unit and the image forming unit. ).
- the display device includes a light guide plate that guides light from the backlight unit to the image forming unit (claim 9).
- the light emitting device of the present invention it is possible to obtain illumination, a backlight unit for display device, and a display device that are excellent in luminous efficiency and color rendering.
- both the luminous efficiency and color reproducibility of the display device are improved. It can be done.
- FIG. 1 (a) and FIG. 1 (b) are diagrams schematically showing a main part of a light emitting device as a first embodiment of the present invention, and FIG. 1 (a) is a sectional view thereof. FIG. 1 (b) is an exploded perspective view thereof.
- FIGS. 2 (a) and 2 (b) are diagrams schematically showing the main part of a light-emitting device as a second embodiment of the present invention, and FIG. 2 (a) is a cross-sectional view thereof. FIG. 2 (b) is a perspective view thereof.
- FIG. 3 is a diagram schematically showing a cross section of a main part of a display for explaining an example of a backlight unit using the light emitting device of the present invention.
- FIG. 4 is a schematic exploded perspective view for explaining the outline of a display device as a third embodiment of the present invention.
- FIG. 5 is a schematic plan view of a backlight unit according to a third embodiment of the present invention.
- FIG. 6 is a schematic cross-sectional view for explaining a main part of a backlight unit according to a third embodiment of the present invention.
- FIG. 7 is a chromaticity diagram for explaining a preferable range as color coordinates of light synthesized from blue light and green light in the display device according to the third embodiment of the present invention.
- FIG. 8 is a schematic cross-sectional view for explaining a main part of a backlight unit in a modification of the third embodiment of the present invention.
- FIG. 9 is a cross-sectional view schematically showing an example of a configuration of a light emitting unit using a surface mounting type frame of a backlight unit in a modification of the third embodiment of the present invention.
- FIG. 10 is a cross-sectional view schematically showing a configuration of a display device using a light guide plate as a modification of the third embodiment of the present invention.
- FIG. 11 is a chromaticity diagram for explaining a method of synthesizing white light in Examples 1 to 4 of the present invention.
- FIG. 12 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 1 of the present invention.
- FIG. 13 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 2 of the present invention.
- FIG. 14 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 3 of the present invention.
- FIG. 15 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 4 of the present invention.
- FIG. 16 is a chromaticity diagram for explaining a method of synthesizing white light in Examples 5 to 7 of the present invention.
- FIG. 17 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 5 of the present invention.
- FIG. 18 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 6 of the present invention.
- FIG. 19 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 7 of the present invention.
- FIG. 20 is a chromaticity diagram for explaining a method of synthesizing white light in Examples 8 to 11 of the present invention.
- FIG. 21 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 8 of the present invention.
- FIG. 22 is a graph showing the emission intensity distribution with respect to the wavelength of white light, calculated in Example 9 of the present invention.
- FIG. 23 is a graph showing the emission intensity distribution with respect to the wavelength of white light, calculated in Example 10 of the present invention.
- FIG. 24 is a graph showing the emission intensity distribution with respect to the wavelength of white light, calculated in Example 11 of the present invention.
- FIG. 25 is a chromaticity diagram for explaining a method of synthesizing white light in Examples 12 to 14 of the present invention.
- FIG. 26 is a graph showing the emission intensity distribution with respect to the wavelength of white light calculated in Example 12 of the present invention.
- FIG. 27 is a graph showing the emission intensity distribution with respect to the wavelength of white light, calculated in Example 13 of the present invention.
- FIG. 28 is a graph showing the light emission intensity distribution with respect to the wavelength of white light, calculated in Example 14 of the present invention.
- the light-emitting device of the present invention includes a light source, a first light-emitting unit, a second light-emitting unit, and a light-shielding unit, and emits light toward a direction in which light is to be emitted (hereinafter referred to as “predetermined direction” as appropriate). It is configured to release.
- the light emitting device includes a frame as a base for holding the light source, the first light emitting unit, the second light emitting unit, and the light shielding unit.
- the frame is a base that holds the light source, the first light emitting unit, the second light emitting unit, and the light shielding unit, and its shape, material, and the like are arbitrary.
- a plate shape, a cup shape, or the like can be used according to the application.
- a cup-shaped frame is preferable because it can have directivity in the light emission direction and can effectively use light emitted from the light-emitting device.
- an appropriate material such as an inorganic material such as a metal, an alloy, glass, carbon, or ceramics, or an organic material such as a synthetic resin can be used.
- the material of the frame it is preferable to use a material with good heat dissipation as the material of the frame.
- a material with good heat dissipation it is preferable to use a material having high thermal conductivity. Normally, the light source generates heat during use, but if the frame is made of a material with good heat dissipation, it can be used stably even if heat is generated during use.
- the surface of the frame to which the light emitted from the light source, the first light emitting unit, and the second light emitting unit hits It is preferable that the reflectance of at least one of the components of light hit is increased, and in particular, it is more preferable that the reflectance of light in the entire visible light range is increased. . Therefore, it is preferable that at least the surface that is exposed to light is formed of a material having high reflectivity.
- the entire frame or the surface of the frame may be formed of a material (such as a resin for injection molding) containing a material having a high reflectance such as glass fiber, alumina powder, titer powder or the like.
- the specific method for increasing the reflectance of the frame surface is arbitrary, and in addition to selecting the material of the frame itself as described above, for example, a metal having a high reflectance such as silver, platinum, and aluminum. It is possible to increase the reflectivity of light by plating with metal or alloy or by vapor deposition.
- the part that increases the reflectivity may be the entire frame or a part of the frame, but usually the part that is irradiated with light emitted from the light source, the first light emitting part, and the second light emitting part. It is desirable that the reflectivity of the entire surface of the glass be increased.
- the frame is usually provided with electrodes for supplying power to the light source.
- the light source emits excitation light of the luminescent material contained in the first light emitting part and the second light emitting part, and also emits one component of light emitted from the light emitting device. That is, a part of the light emitted from the light source is absorbed as excitation light by the luminescent material in the first light emitting part and the second light emitting part, and another part is emitted in a predetermined direction from the light emitting device. It has become so.
- the type of the light source is arbitrary, and an appropriate one can be selected according to the use and configuration of the light emitting device.
- Examples of the light source include a light-emitting diode (hereinafter referred to as “LED” as appropriate), an edge-emitting or surface-emitting laser diode, an electroluminescence element, and the like, but an inexpensive LED is usually preferable.
- the light emission wavelength of the light emitted from the light source is also arbitrary, and a light source that emits light having an appropriate light emission wavelength according to the light emitted from the light emitting device may be used.
- the emission wavelength of the light emitted from the light source is usually 370 nm or more, preferably 380mn or more, usually 500mn or less, preferably ⁇ or 480mn or less.
- the light source include LEDs using InGaN-based, GaAIN-based, InGaAIN-based, ZnSe S-based semiconductors, etc., which have been crystal-grown on a substrate such as silicon carbide, sapphire, gallium nitride, etc. by a method such as MOCVD. Etc.
- a single light source may be used alone, or two or more light sources may be used in combination. Sarako, one light source may be used, or two or more light sources may be used in combination. In particular, in order to improve the color rendering properties of the light emitting device, it is preferable to provide a light source in each of the first light emitting unit and the second light emitting unit.
- the first light emitting unit 2 Closer to the light source than the light emitting part. That is, it is preferable that the distance between the portions where the light source and the first light emitting portion are closest to each other is smaller than the shortest distance between the portions where the light source and the second light emitting portion are closest.
- the light blocking unit blocks only part of the light between the first light emitting unit and the second light emitting unit
- the light source is closer to the second light emitting unit than the first light emitting unit. It is assumed that the light from the light source is incident on the second light emitting part.
- the second light emitting unit emits light with light source power as excitation light, but the light from the second light emitting unit cannot be used as excitation light by the first light emitting unit, so the first light emitting unit emits light.
- the light intensity emitted from the light-emitting device may vary from the target value due to insufficient light intensity or the light emitted from the second light-emitting unit may become too strong, and color rendering may be degraded.
- the first light emitting part is provided at a position closer to the light source than the second light emitting part, light that also emits light source power first enters the first light emitting part.
- the first light emitting unit emits light using the light from the light source as excitation light, so that the first and second light emitting units emit light smoothly. Accordingly, variation in color of light emitted from the light emitting device is reduced, and color rendering can be further improved.
- the intensity of the light emitted from the light source and incident on each of the first light emitting unit and the second light emitting unit is also related to the area of the light receiving surface of each of the first light emitting unit and the second light emitting unit. Therefore, the light source power distance to each of the first light emitting unit and the second light emitting unit, and the respective light receiving power.
- the area of the light emitting surface is preferably set so that the intensity of the light received by the first light emitting unit is greater than the intensity of the light received by the second light emitting unit.
- the specific method is arbitrary, but for example, the light source can be attached using solder.
- solder For example, Au Sn, AgSn, or the like can be used.
- solder it is also possible to supply power from the electrode cover formed in the frame through the solder.
- solder when using high-current LEDs or laser diodes where heat dissipation is important as the light source, it is effective to use solder for the installation of the light source because solder exhibits excellent heat dissipation.
- an adhesive such as epoxy resin, imide resin, or acrylic resin may be used.
- the adhesive can be energized to supply power to the light source as in the case of using solder. It is also possible to scrape. Furthermore, it is preferable to mix these conductive fillers because heat dissipation is also improved.
- the method of supplying power to the light source is arbitrary.
- the light source and the electrode may be connected by wire bonding to supply power.
- the material, dimensions, and the like that limit the wire used at this time are arbitrary.
- metals such as gold and aluminum can be used as the material of the wire, and the force wire whose thickness can be normally set to 20 ⁇ m to 40 ⁇ m is not limited to this.
- Another example of a method for supplying power to the light source is a method for supplying power to the light source by flip chip mounting using bumps.
- the first light emitting unit is formed by including at least one kind of light emitting substance that is excited by light emitted from the light source and emits light including a component having a longer wavelength than the light emitted from the light source.
- the luminescent material used for the first light emitting unit will be described in detail later.
- the light-blocking part blocks only a part of the light emitted toward the second light-emitting part, the light from the first light-emitting part will be part of the second light-emitting part. It becomes the excitation light of the luminescent material.
- the second light emitting unit is excited by light emitted from the light source and light emitted from the first light emitting unit, and emits at least one kind of light containing a component having a longer wavelength than the light emitted from the first light emitting unit. It is formed including a luminescent material. There is no particular limitation on the shape of the second light emitting part, and the second light emitting part can be provided alone at one place or divided into two or more places. The luminescent material used for the second light emitting part will also be described in detail later.
- the light emitted from the light source is received, and the light emitting material emits light using the received light as excitation light.
- the light emitting material emits light using the incident light from the first light emitting unit as excitation light.
- the emitted light is emitted outside the light emitting device as a component of light emitted by the light emitting device.
- both the first light emitting unit and the second light emitting unit are open to the outside on the light emitting surface.
- the light emitting surface means a surface from which the light emitting device emits light in a predetermined direction. Therefore, the light emitted from the light source, the first light emitting unit, and the second light emitting unit is emitted toward the light emitting surface force in a predetermined direction.
- the shape of the light exit surface is arbitrary, and it is desirable that the light exit surface has an appropriate shape such as a flat surface, a curved surface, or an uneven surface, depending on the application.
- the first light emitting unit and the second light emitting unit being opened means that light emitted from the first and second light emitting units in a predetermined direction is not shielded by other members. It means being released. More specifically, the light emitted from the first light emitting unit in a predetermined direction is not blocked by the light source, the light shielding unit, the second light emitting unit, and the frame (if the light emitting device includes a frame). Indicates that the light is emitted to the outside of the light emitting device, and from the second light emitting unit in a predetermined direction.
- a protective layer is formed on the light exit surface or a cover is attached to the light emitting device.
- the first light can be transmitted as long as light emitted from other members such as a protective layer and a cover can be transmitted.
- the second light emitting unit is assumed to be open.
- the light emitted from the first light emitting unit and the light emitted from the second light emitting unit are different from each other. It is possible to reduce (or eliminate) the degree to which the intensity is weakened by being absorbed by other luminescent materials or shielded by other members. Accordingly, it is possible to increase the light emission efficiency of the light emitting device, reduce variations in the light components emitted from the light emitting device, and improve the color rendering properties of the light emitting device.
- the light emitting device light can be emitted using the three primary colors of blue light, red light and green light, the light source, the first light emitting part, and the second light emitting part can be selected appropriately.
- the color reproducibility of the light emitting device of the invention can be made excellent.
- the light-shielding part prevents light emitted from the first light-emitting part from entering the second light-emitting part.
- the light shielding unit only needs to prevent at least a part of the light emitted from the first light emitting unit force from entering the second light emitting unit, but is normally emitted from the light emitting device in a predetermined direction. It is only necessary to prevent the light emitted from the first light emitting portion from entering the second light emitting portion to such an extent that the light is sufficiently high to withstand practical use and the light emission efficiency and color rendering can be exhibited. Furthermore, it is preferable that all the light emitted from the first light emitting unit is not incident on the second light emitting unit.
- the light shielding part is preferably formed so as to reflect at least a part of the light emitted from the first light emitting part. Furthermore, it is more preferable that the first light emitting unit is generated so that it can reflect all of the light that hits the light blocking unit. This Accordingly, the light emitted from the first light emitting unit can be used effectively, and the light emission efficiency and color rendering properties of the light emitting device can be further improved.
- the light shielding part is formed so as to reflect at least part of the light emitted by the second light emitting part force. More preferably, it is formed so as to be able to reflect all of the light hitting the light. As a result, the light emitted from the second light emitting unit can be used effectively, and the light emission efficiency and color rendering of the light emitting device can be further improved.
- the light-shielding part is emitted from a light source that is preferably configured to reflect at least part of the light emitted from the light source, and reflects all of the light that strikes the light-shielding part. It is more preferable that it is formed so as to be able to. As a result, the light emitted from the light source can be used effectively, and the light emission efficiency and color rendering of the light emitting device can be further improved.
- At least one of light components that is, light emitted from any one of the light source, the first light-emitting unit, and the second light-emitting unit
- the reflectance of the component is increased, and it is more preferable that the reflectance of light in the visible light castle is increased. Therefore, like the frame, at least the surface that is exposed to light is preferably formed of a material having high reflectivity.
- Specific examples include forming the entire light-shielding portion or the surface of the light-shielding portion with a material (such as a resin for injection shaping) containing a material having a high reflectance such as glass fiber, alumina powder, and titania powder.
- a material such as a resin for injection shaping
- a material having a high reflectance such as glass fiber, alumina powder, and titania powder.
- the specific method for increasing the reflectance of the surface of the light shielding part is arbitrary.
- the material of the light shielding part itself for example, it has a high reflectance such as silver, platinum, and aluminum.
- the light reflectance can also be increased by performing a matt treatment with a metal or alloy.
- the part that increases the reflectivity may be the entire light shielding part or a part of the light shielding part, but in general, all the parts that are exposed to light emitted from the light source, the first light emitting part, and the second light emitting part. It is desirable that the reflectivity of the surface is increased.
- the shape of the light-shielding portion may be formed in any shape without any other limitation as long as at least a part of the light emitted from the first light-emitting portion can be prevented from entering the second light-emitting portion. it can.
- plate-like, net-like, mesh-like parts that partition between the first light-emitting part and the second light-emitting part It may be formed as a material.
- the light shielding part may be formed integrally with the frame or may be formed separately. However, in general, it is preferable to set the position of the light shielding portion so that the light emitting device can emit the target light according to the light emission intensity of the first light emitting portion and the second light emitting portion.
- the frame with a plurality of recesses (such as cup-shaped recesses) and providing each of the recesses with a light source and the first light-emitting unit or the second light-emitting unit is advantageous in manufacturing the light-emitting device. This is preferable in terms of ease. In this case, it functions as a wall portion light shielding portion of the frame that divides each recess. A display device using this form will be described in detail in a third embodiment.
- the material of the light shielding part may be formed of any material without any other limitation as long as at least a part of the light emitted from the first light emitting part can be prevented from entering the second light emitting part. it can.
- an inorganic material such as a metal, an alloy, or glass, an organic material such as a synthetic resin, or carbon can be used depending on the application.
- a material that normally reflects the light emitted from the first light-emitting part and the second light-emitting part and does not absorb the light emitted from the first light-emitting part and the second light-emitting part as described above is preferable.
- a light shielding part is provided between the first light emitting part and the second light emitting part, whereby the light emitted from the first light emitting part is incident on the second light emitting part. To prevent that. Thereby, the luminous efficiency and color rendering of the light emitting device of the present invention can be improved.
- the mechanism is described in detail below.
- the luminescent material absorbed the light from the first light emitting part as excitation light. Accordingly, the light emitted from the first light emitting unit is consumed by the second light emitting unit. For this reason, the intensity of the light from the first light emitting unit, which should have been emitted outside the light emitting device, was reduced, the luminous flux of the light emitted from the light emitting device was reduced, and the light emission efficiency was lowered. In addition, since the light emitted from the first light emitting unit is consumed by the second light emitting unit, the balance of the components of the light emitted from the light emitting device also varies, and the color reproducibility of the light emitting device is degraded.
- the light emitted from the light emitting device is intended to be the target color
- the light of the first light emitting unit is absorbed by the second light emitting unit.
- Second light emission It was necessary to increase the ratio of the light emitting material of the first light emitting part to the light emitting material of the part.
- the usage ratio of the light emitting material is larger than the optimum value. Since it is easily detached, the color rendering property of light tends to be lowered.
- the light shielding unit prevents the light emitted from the first light emitting unit from entering the second light emitting unit. It can be suppressed that the light of the light emitting portion is absorbed by the second light emitting portion and its intensity is weakened. Therefore, the light emission efficiency of the light emitting device can be improved as compared with the prior art.
- the variation in the light component emitted by the light emitting device can be reduced to reduce the color rendering property of the light emitting device. Can also be increased. As a result, the color rendering and color reproducibility of the light emitting device can be improved.
- excitation light (mainly light from the light source) can be supplied to the first light emitting unit and the second light emitting unit, and further emitted from the light source, the first light emitting unit, and the second light emitting unit. If light can be emitted to the outside of the light emitting device, the arrangement, size, shape, and the like of each member constituting the light emitting device can be arbitrarily set.
- the first light emitting unit, the second light emitting unit, the light source, and the frame may be arranged at a distance so as to have a gap therebetween.
- a gap may be formed between the first light emitting unit and the second light emitting unit.
- a gap may be formed between one or both of the first light emitting unit and the second light emitting unit and the light source.
- a gap may be formed between one or both of the first light emitting part and the second light emitting part and the light shielding part.
- a distance is provided between the first light emitting unit and the second light emitting unit, one or both of the first light emitting unit and the second light emitting unit, and the light source so that they do not contact each other.
- other members may be provided between the two.
- a protective layer of transparent resin is formed on the entire circumference of the light source, the light from the light source is emitted as a luminous flux even though the distance between the light source and the first light emitting unit and the second light emitting unit is increased.
- the light source can be protected without reducing the intensity of light emitted from the light emitting device.
- the first light emitting unit and the second light emitting unit may have different sizes.
- the light emitting device of the present invention may include a member other than the light source, the first light emitting unit, the second light emitting unit, and the frame described above.
- a cover for protecting the light emitting device itself may be provided.
- a light guide member such as a mirror, a prism, a lens, or an optical fiber for changing the direction of the emitted light may also be provided.
- a light diffusion layer may be provided outside the light emitting surface of the light emitting device in order to diffuse each component of the light emitted from the light emitting device and prevent uneven color of the visible light.
- the light-emitting substance used in the light-emitting device of the present invention absorbs excitation light and can emit light containing a longer wavelength component than the absorbed excitation light.
- the light emitting material is usually used in a mixture with a binder.
- the light-emitting substance a known substance can be appropriately selected and used according to the use of the light-emitting device.
- the emission itself is not limited by any mechanism such as fluorescence or phosphorescence.
- one kind of light emitting substance may be used alone, and two or more kinds may be used in any combination and ratio.
- the luminescent material used for the first light emitting unit is selected to emit light containing a component having a longer wavelength than the light emitted from the light source when excited by the light emitted from the light source
- the luminescent material used for the second light emitting unit is A light source that emits light including a component having a longer wavelength than the light emitted from the first light emitting unit when excited by the light emitted from the first light emitting unit is selected.
- the light-emitting substance has a wavelength of usually 350 nm or more, preferably 400 nm or more, more preferably 430 nm or more, and usually 600 nm or less, preferably 570 nm or less as excitation light. Or something that absorbs light below 550nm!
- the luminescent substance has a wavelength of emitted light of usually 400 nm or more, preferably 450 ⁇ m or more, more preferably 500 nm or more, and usually 750 nm or less, preferably 700 nm or less, more preferably 670 nm or less. Is desirable.
- the excitation light has a wavelength of usually 350 nm or more, preferably 400 nm or more, more preferably 430 nm or more, and usually 520 nm or less, preferably 500 nm or less, more preferably. It is desirable that absorbs light of 480 nm or less.
- the light-emitting substance used in the first light-emitting portion has a wavelength of emitted light of usually 400 nm or more, preferably 450 nm or more, more preferably 500 nm or more, and usually 600 nm or less, preferably 570 nm or less, more preferably 550 nm or less. Something is desired!
- the wavelength of the excitation light is usually 400 nm or more, preferably 450 nm or more, more preferably 500 nm or more, and usually 600 nm or less, preferably 570 nm or less. More preferably, it absorbs light of 550 nm or less.
- the light-emitting substance used in the second light-emitting portion has a wavelength of emitted light of usually 550 nm or more, preferably 580 nm or more, more preferably 600 nm or more, and usually 750 nm or less, preferably 700 nm or less, more preferably 670 nm or less. Something is desired!
- the luminescent substance has a luminous efficiency of usually 40% or more, preferably 45% or more, more preferably 50% or more, even more preferably 55% or more, and most preferably 60% or more. It is preferable to use it.
- the luminous efficiency shown here is a value expressed as the product of quantum absorption efficiency and internal quantum efficiency.
- a light emitting material suitable for use in the light emitting device of the present invention will be exemplified and described for each light emitting section.
- the light-emitting substance is not limited to the following examples, and it is within the scope of the present invention whether each exemplified light-emitting substance is used in the first light-emitting part or the second light-emitting part. Can be arbitrarily selected.
- a phosphor represented by the following formula (1) can be given.
- M 1 represents a divalent metal element
- M 2 represents a trivalent metal element
- M 3 represents a tetravalent metal element
- a, b, c, and d represent Each is a number in the following range.
- M 1 is a divalent metal element.
- the group force consisting of Mg, Ca, Zn, Sr, Cd, and Ba is at least one selected.
- Particularly preferred is Ca, which is more preferably Mg, Ca, or Zn.
- Ca may be a single system or a composite system with Mg.
- M 1 is preferably composed of the elements that are preferred in the above, but may contain other divalent metal elements as long as the performance is not impaired.
- M 2 in the above formula (1) is from the same plane as the force M 1 that is a trivalent metal element, and from the group consisting of Al, Sc, Ga, Y, ⁇ , La, Gd, and Lu. Particularly preferred is Sc, which is more preferably Al, Sc, Y, or Lu, which is preferably at least one selected. In this case, Sc may be a single system or a complex system with Y or Lu. Basically, M 2 is preferably composed of the elements that are preferred in the above, but may contain other trivalent metal elements as long as the performance is not impaired.
- M 3 in the above formula (1) preferably contains at least Si from the same surface as the force M ⁇ M 2 which is a tetravalent metal element. Further, it is desirable that the tetravalent metal element represented by M 3 is usually 50 mol% or more, preferably 70 mol% or more, more preferably 80 mol% or more, and particularly preferably 90 mol% or more Si. ,.
- M 3 other than Si is, Ti, Ge, Zr, Sn, and at least one selected the group force consisting Hf of the Preferred group power consisting of Ti, Zr, Sn, and Hf At least one selected from group power is particularly preferred.
- M 3 is preferably Si. Basically, it is preferable that M 3 also has a preferable elemental force in the above, but within a range not impairing the performance, Including other tetravalent metal elements!
- the crystal structure of the phosphor is usually a garnet crystal structure, which is generally a in the above formula (1), a is 3, b is 2, c is 3, and d is 12 This is a body-centered cubic crystal.
- a is 3 and b is 2, c by substituting it for the position of the crystal lattice of any metal element of M 2 or M 3 or by arranging it in the gap between the crystal lattices. It is possible that is 3 and d is not 12. Therefore, a, b, c, and d are 2. 7 ⁇ a ⁇ 3.3, 1.8 ⁇ b ⁇ 2. 2, 2. 7 ⁇ c ⁇ 3.3, 1 1. 0 ⁇ d ⁇ 13. A number in the range of 0 is preferred.
- the luminescent center ion contained in the compound matrix of this crystal structure contains at least Ce, and Cr, Mn, Fe, Co, Ni, Cu, Pr for fine adjustment of the luminescent properties.
- Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb can also contain one or more divalent to tetravalent elements.
- Mn, 2 to 3 valent Eu, or trivalent Tb can be particularly preferably used.
- This phosphor is usually 420 ⁇ ! Excited with light in the wavelength range of ⁇ 480nm.
- the emission spectrum has a 500 to 510 nm peak and a wavelength component of 450 to 650 nm.
- a phosphor represented by the following formula (2) can be given.
- M 1 is an activator element containing at least Ce
- M 2 is a divalent metal element
- M 3 is a trivalent metal element
- a, b, c, and d are respectively It is a number in the following range. 0. 0001 ⁇ a ⁇ 0. 2
- M 1 in the above formula (2) is an activator element contained in the crystal matrix described later, and contains at least Ce. Also, Cr, Mn, Fe, Co, Ni, Cu, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb for the purpose of phosphorescence and chromaticity adjustment It can contain at least one divalent to tetravalent element selected.
- the value a representing the content of the activator element M 1 is 0.0001 ⁇ a ⁇ 0.
- a is preferably 0.0005 or more, more preferably 0.002 or more, and preferably 0.1 or less, more preferably 0.04 or less.
- Ce content increases, the emission peak wavelength shifts to the longer wavelength side, and the green emission amount with high visibility is relatively increased.
- a is usually 0.004 or more, preferably 0.008 or more, more preferably 0.02 or more, and usually 0.15 or less, preferably 0.1 or less, more preferably 0.08 or less. More desirable.
- M 2 in the above formula (2) is a divalent metal element. From the viewpoint of luminous efficiency, etc., a group force consisting of Mg, Ca, Zn, Sr, Cd, and Ba is selected. It is particularly preferable that 50 mol% or more of the element of M 2 which is preferably Mg, Ca or Sr which is preferably one kind is Ca.
- M 3 in the formula (2) consists of the same surface as the force M 2 is a trivalent metal element, A1, Sc, Ga, Y , In, La, Gd, Yb, and Lu More preferred is Al, Sc, Yb, or Lu, which is preferably at least one selected from the group, and even more preferred is Sc, or Sc and Al, or Sc and Lu. It is particularly preferable that 50 mol% or more of the M 3 element is Sc.
- the base crystal of the phosphor is generally composed of a divalent metal element M 2 and a trivalent metal element. Because it is a crystal represented by the composition formula M 2 M 3 O, consisting of M 3 and oxygen, the chemical composition ratio is
- b is 1, c is 2, and d force.
- Ce which is an activator element, is replaced by the force of replacing M 2 or M 3 with the position of the crystal lattice of one of the metal elements, or disposed in the gap between the crystal lattices.
- b may be 1, c force ⁇ , and d may not be 4.
- b is usually a number of 0.8 or more, preferably 0.9 or more, and usually 1.2 or less, preferably 1.1 or less.
- c is usually 1.6 or more, preferably 1.8 or more, and usually 2.4 or less, preferably 2.2 or less.
- d is usually a number of 3.2 or more, preferably 3.6 or more, and usually 4.8 or less, preferably 4.4 or less.
- M 2 and M 3 represent divalent and trivalent metal elements, respectively, but there are essentially different points in terms of light emission characteristics and crystal structure.
- a small part of M 2 and Z or M 3 can be a monovalent, tetravalent, or pentavalent metal element, and the charge balance can be adjusted.
- Ions for example, halogen elements (F, Cl, Br, 1), nitrogen, sulfur, selenium and the like may be contained in the compound.
- This phosphor is excited by light in the wavelength range of 420 nm to 480 nm and is most efficient especially at 440 to 470 nm.
- the emission spectrum has a peak at 490 to 550 nm and a wavelength component of 450 to 700 nm.
- light emitting materials suitable for use in the first light emitting part include Y (Al, Ga) 2 O 3: Ce
- the above phosphors may be used alone or in any combination of two or more. And you can use it in proportions!
- the exemplified phosphors those having a garnet crystal structure are preferable because they hardly deteriorate against heat, light, and water.
- Specific examples of the phosphor having such a garnet crystal structure include the phosphor exemplified as the first example of the phosphor emitting green light, and Y (Al, Ga) 2 O 3: Ce.
- a phosphor represented by the following formula (3) can be given.
- M is Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb. 2 or more elements that contain at least Eu
- A is a divalent metal element force other than M element, and is a group force of 1 or 2 elements selected
- D is E represents one or more elements selected from the group consisting of tetravalent metal elements
- E represents one or more elements selected from the group power selected from trivalent metal element forces
- X represents , 0, N
- F represents one or more elements selected from the group of forces.
- a, b, c, d, and e are numbers in the following ranges, respectively.
- M contains at least Eu, and Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm, and Yb force are also selected. 2 or more elements. Among them, Eu is preferred to be one or more elements selected from the group consisting of Mn, Ce, Sm, Eu, Tb, Dy, Er, and Yb. More preferably.
- A is a group force that is a divalent metal element force other than the M element. Among the forces that are one or more elements selected, Mg, Ca, One or more elements selected from the group consisting of Sr and Ba are preferable. Ca or a composite system of Ca and Sr is more preferable.
- D is one or more elements selected from the group consisting of tetravalent metal elements, among which Si, Ge, Sn, Ti, Zr, Hf It is more preferable that Si is one or more elements selected from the group consisting of Si.
- E is one or more elements selected from the group consisting of trivalent metal elements, among which B, Al, Ga, More preferably, Al is preferably one or more elements selected from the group force consisting of In, Sc, Y, La, Gd, and Lu.
- X is one or more elements selected from the group consisting of 0, N, and F. Among them, N, or N and O and O forces are also preferable.
- a Value power ⁇ 0. From 00001 / J If there is a small number of M as the light emission center, the light emission brightness may decrease. If the a value is greater than 0.1, the concentration may be quenched by interference between M ions and the brightness may decrease. In particular, in the case of M force 3 ⁇ 4u, it is preferable that the a value is 0.002 or more and 0.03 or less in that light emission luminance is increased.
- c is the content of D element such as Si, and is an amount represented by 0.5 ⁇ c ⁇ 4.
- d is the content of E element such as A1, and is an amount represented by 0.5 ⁇ d ⁇ 8.
- the d value is less than 0.5 or greater than 8, the light emission luminance may decrease.
- compositions with high emission brightness include at least Eu in the M element, Ca in the A element, Si in the D element, A1 in the E element, and X
- the element contains N.
- an inorganic compound in which the M element is Eu, the A element is Ca, the D element is Si, the E element is A1, and the X element is N or a mixture of N and O is desirable.
- This phosphor is excited by light having a wavelength of at least 580 nm and is most efficient particularly in the wavelength range of 400 nm to 550 nm, and therefore absorbs light emitted from the first light emitting part well.
- the emission spectrum has a peak in the wavelength range of 580 nm to 720 nm.
- M represents at least one element selected from Ba, Mg, and Zn
- a, b, c, d, and e are numbers in the following ranges, respectively.
- the preferable range of a in the above formula (4) is usually 0.0002 or more, preferably 0.0004 or more, and usually 0.02 or less.
- the preferable range of a in the above formula (4) is usually 0.0004 or more, usually 0.01 or less, preferably 0.007 or less, more preferably 0.005.
- a in the above formula (4) is usually 0.0004 or more, usually 0.01 or less, preferably 0.007 or less, more preferably 0.005.
- more preferably 0.004 or less is usually 0.0004 or more, usually 0.01 or less, preferably 0.007 or less, more preferably 0.005.
- the preferable range of a in the above formula (4) is generally described. It is usually 0.004 or more, preferably 0.001 or more, and usually 0.02 or less, preferably 0.008 or less.
- the content of the luminescent center ion Eu 2+ is smaller than the above range, the luminescence intensity tends to decrease.
- concentration quenching is there.
- the preferred range of a in the above formula (4) which has all of thermal stability, temperature characteristics, and light emission intensity. A range of 0.004 or less is desirable.
- M representing at least one element selected from Ba, Mg, and Zn is not necessarily an essential element for the present invention, but the molar ratio d of M is 0 ⁇ d ⁇ Even if it is contained in the chemical substance of the formula (4) at a ratio of 0.1, the object of the present invention can be achieved.
- This phosphor is excited by light of 600 nm or less, and has the highest efficiency, particularly at 400 nm to 550 nm. Therefore, the phosphor emits light emitted from the first light emitting part well.
- the emission spectrum is 620 ⁇ ! Has a peak at ⁇ 680 nm.
- the luminescent material suitable for use in the second light emitting part are not particularly limited as long as the emission wavelength is 550 nm to 750 nm and the emission wavelength is longer than that of the first light emitting part.
- CaSi N Eu
- a fluorescent europium complex or the like can be used.
- the above phosphors may be used alone or in any combination of two or more. And ratios may be used in combination.
- the luminescent material is usually used in the form of particles.
- the particle diameter of the luminescent material particles is usually 150 ⁇ m or less, preferably 50 ⁇ m or less, more preferably 20 ⁇ m or less, still more preferably 10 ⁇ m or less, and most preferably 5 m or less.
- the emission color variation of the light emitting device becomes large, and when the light emitting material and the sealing material are mixed, it may be difficult to uniformly apply the light emitting material.
- it is usually 0.001 ⁇ m or more, preferably 0.01 ⁇ m or more, more preferably 0.1 ⁇ m or more, still more preferably 1 ⁇ m or more, and most preferably 2 m or more. Below this range, the luminous efficiency decreases.
- the volume ratio of the light emitting material of the first light emitting unit to the light emitting material of the second light emitting unit is arbitrary, but is usually 0.05 or higher, preferably 0.1 or higher, more preferably 0.2 or higher. Also, it is usually 1 or less, preferably 0.8 or less, more preferably 0.5 or less. It is preferable if this ratio is too large or too small. It is difficult to obtain white light emission.
- the first light emitting part and the second light emitting part without using a binder
- a light emitting material is fired to produce a fired body, and the fired body is directly used as the first light emitting part or the first light emitting part. It can be used for two light emitting parts. Further, for example, even when glass is made of a light emitting substance or a single crystal of a light emitting substance is used, the first light emitting part and the second light emitting part can be produced without using a binder. Even when the binder is not used, other components such as additives can be coexisted in the first light emitting part and the second light emitting part.
- the second light emitting unit includes a light emitting substance that emits light including a component having a longer wavelength than the light emitted from the first light emitting unit when excited by the light emitted from the light source and the first light emitting unit, and a binder.
- the light emitting material of the first light emitting unit may be mixed.
- the concentration of the luminescent material of the first light-emitting part contained in the second light-emitting part is low V, and the light-emitting substance of the first light-emitting part is contained in the second light-emitting part. It's more preferable!
- the light emitting material of the second light-emitting unit is not usually contained in the first light-emitting unit, but the light-emitting power of the second light-emitting unit is sufficient if the luminous flux power of the light emitted from the first light-emitting unit is small enough Even if the substance is contained, the light emitting substance of the second light emitting part, which is usually 40% by volume or less, is completely contained. More preferably not. That is, even though the light emitting material in the second light emitting unit is excited by the light emitted from the first light emitting unit, the light emitted from the light emitting material in the first light emitting unit in the first light emitting unit is secondly emitted.
- the luminescent material in each light emitting part should be selected so that the luminescent material in the light emitting part does not absorb too much.
- the first light emitting unit and the second light emitting unit may contain a binder in addition to the light emitting substance.
- Noinda is usually used to collect powdered or particulate luminescent materials or attach them to a frame.
- a binder used in the light emitting device of the present invention Any known one without any limitation can be used.
- the light emitting device is transmissive, that is, light emitted from the light source, the first light emitting unit, and the second light emitting unit is transmitted through the first light emitting unit or the second light emitting unit and emitted to the outside of the light emitting device.
- inorganic materials such as glass can be used in addition to rosin and the like.
- the resin include organic synthetic resins such as epoxy resin and silicon resin, and inorganic materials such as polysiloxane gel and glass.
- the viscosity of the resin is arbitrary, but it has an appropriate viscosity according to the particle diameter and specific gravity of the luminescent material to be used, in particular, the specific gravity per surface area. It is desirable to use a binder.
- a binder For example, when epoxy resin is used as a binder, if the particle size of the luminescent material particles is 2 ⁇ m to 5 ⁇ m and the specific gravity is 2 to 5, usually 1 to: an epoxy having a viscosity of LOPas The use of rosin is preferable because the phosphor particles can be well dispersed.
- Binders may be used alone or in combination of two or more in any combination and ratio.
- the ratio between the luminescent material and the binder is not limited, but the ratio of the luminescent material to the binder is usually 0.01 or more, preferably 0.05 or more, more preferably, by weight. 0.1 or more, usually 5 or less, preferably 1 or less, more preferably 0.5 or less It is desirable that
- the light-emitting device is a transmissive type
- the light emitting device is of a reflective type (that is, light emitted from the light source, the first light emitting unit, and the second light emitting unit is emitted outside the light emitting device without passing through the first light emitting unit or the second light emitting unit).
- the luminescent material is filled with high density. Therefore, the composition of the luminescent material should be set in accordance with the use of the light-emitting device, the type and physical properties of the luminescent material, the type and viscosity of the noinda, etc., taking these into consideration.
- the emission color of the light emitted from the light emitting device can be arbitrarily changed by adjusting the ratio of the light emitting materials of the first light emitting unit and the second light emitting unit and the weight of the light emitting material used. wear.
- the light emitting material may contain other components, and the first light emitting portion and the second light emitting portion may be formed of the light emitting material, a binder used as appropriate, and other components.
- any other known additive with no particular limitation can be used.
- a diffusing agent such as alumina or yttria
- a binder such as pyrophosphoric acid barium calcium borate as other components.
- the first light-emitting part and the second light-emitting part can be manufactured by any method without particular limitation.
- the first light-emitting unit and the second light-emitting unit prepare a slurry by dispersing a light-emitting substance, an appropriately used binder, and other components in a dispersion medium. After applying to a substrate such as a film, the slurry can be dried to form.
- the slurry is prepared by mixing the luminescent material and other components such as binders and additives that are used as appropriate in a dispersion medium.
- the name of the slurry may be changed to a paste, a pellet, or the like depending on the type of the binder.
- dispersion medium used for slurry preparation there is no limitation on the dispersion medium used for slurry preparation, and any known dispersion medium can be arbitrarily used. Specific examples thereof include chain hydrocarbons such as n-hexane, n-heptane, and solvesso, aromatic hydrocarbons such as toluene and xylene, halogenated hydrocarbons such as trichloroethylene and perchloroethylene, and methanol.
- chain hydrocarbons such as n-hexane, n-heptane, and solvesso
- aromatic hydrocarbons such as toluene and xylene
- halogenated hydrocarbons such as trichloroethylene and perchloroethylene
- methanol methanol
- Alcohols such as ethanol, isopropanol and n-butanol, ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone, esters such as ethyl acetate and n -butyl acetate, ethers such as cellosolve, butylsolve and cellosolveacetate And aqueous solvents such as water and arbitrary aqueous solutions.
- ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone
- esters such as ethyl acetate and n -butyl acetate
- ethers such as cellosolve, butylsolve and cellosolveacetate
- aqueous solvents such as water and arbitrary aqueous solutions.
- the prepared slurry is applied to a substrate such as a frame.
- the application method is arbitrary, but for example, a method such as dispensation or potting can be used.
- coating with the slurry used as a 1st light emission part and the slurry used as a 2nd light emission part is arbitrary, and you may apply any first. Moreover, you may apply
- the dispersion medium is dried to produce the first light emitting part and the second light emitting part.
- Any drying method can be used. For example, natural drying, heat drying, vacuum drying, baking, ultraviolet irradiation, electron beam irradiation, or the like may be used. Among these, baking at a temperature of several tens of degrees Celsius to one hundred and several tens of degrees Celsius is preferable because the dispersion medium can be easily and reliably removed with inexpensive equipment.
- the first light-emitting part and the second light-emitting part can be produced by mixing a light-emitting substance with a binder and other components that are used as appropriate and kneading them. Further, when molding, for example, press molding, extrusion molding (T-die extrusion, inflation extrusion, pro-molding, melt spinning, profile extrusion, etc.), injection molding, etc. are performed. .
- the binder is a thermosetting material such as epoxy resin or silicon resin
- the binder before curing, the luminescent material, and other components used as appropriate are mixed and molded, and thereafter
- the first light emitting part and the second light emitting part can be produced by curing the binder by heating.
- the binder is UV curable
- the first and second light emitting parts can be produced by curing the binder resin by irradiating UV light instead of heating in the above method. .
- the first light emitting unit and the second light emitting unit may be manufactured in a series of steps when manufacturing the light emitting device, but the first light emitting unit and the second light emitting unit are separately prepared in advance.
- the light emitting device may be completed by later being incorporated into a frame or the like. Furthermore, it is possible to prepare a unit in which the frame and one of the first light emitting unit and the second light emitting unit are combined, and to complete the light emitting device by combining these units.
- a method of providing a light shielding portion is also arbitrary.
- a light shielding unit may be provided between them.
- the light shielding unit may be formed in advance in the frame and divided by the light shielding unit. You may make it provide a 1st light emission part and a 2nd light emission part after that by apply
- FIGS. 1 (a) and 1 (b) are diagrams schematically showing the main part of the light emitting device as the first embodiment of the present invention, and FIG. 1 (a) is a cross-sectional view thereof. (b) is an exploded perspective view with the partition plate removed for explanation.
- the light emitting device 1 of the present embodiment includes a frame 2, a blue LED (blue light emitting unit) 3 as a light source, and a green light emitting unit as a first light emitting unit. And a red light emitting portion 5 as a second light emitting portion and a partition plate 6 as a light shielding portion.
- the frame 2 is a base made of resin for holding the blue LED 3, the green light emitting unit 4, the red light emitting unit 5, and the partition plate 6.
- a trapezoidal recess (dent) 2A having an opening on the upper side in the figure is formed.
- the dimensions of the recess 2A of the light-emitting device 1 are such that the light-emitting device 1 can emit light in a predetermined direction (here, upward in the figure). The dimensions are set.
- an electrode (not shown) to which external force power of the light emitting device 1 is supplied is provided at the bottom of the recess 2A, and power can be supplied to the blue LED 3 from this electrode.
- the inner surface of the concave portion 2A of the frame 2 is enhanced in the reflectance of light in the entire visible light region by metal plating, so that the light hitting the inner surface of the concave portion 2A of the frame 2 is also predetermined from the light emitting device 1. It can be released in the direction. In addition, it is a matter of course that care should be taken so that metal plating does not short the electrode! /.
- a blue LED 3 is installed as a light source.
- the blue LED 3 is an LED that emits blue light when supplied with electric power. Part of the blue light emitted from the blue LED 3 is absorbed as excitation light by the light emitting material (here, fluorescent material) in the green light emitting part 4 and the red light emitting part 5, and another part is the light emitting device 1 Is emitted in a predetermined direction (here, upward in the figure).
- the blue LED 3 is installed at the bottom of the recess 2A of the frame 2, but here, a silver paste (silver particles on the adhesive is used between the frame 2 and the blue LED 3).
- the blue LED3 is installed on the frame 2 by the glued by 7) Yes. Sarasako, this silver paste 7 also plays a role in dissipating the heat generated by the blue LED3.
- a gold wire 8 for supplying power to the blue LED 3 is attached to the frame 2.
- the blue LED 3 and the electrode (not shown) provided at the bottom of the recess 2A of the frame 2 are connected by wire bonding using the wire 8, and when the wire 8 is energized, the blue LED 3 is energized. Supplied, blue LED 3 emits blue light.
- the recess 2A of the frame 2 is provided with a green light emitting part 4 as a first light emitting part and a red light emitting part 5 as a second light emitting part.
- the concave portion 2A is filled with the green light emitting portion 4 and the red light emitting portion 5, and the green light emitting portion 4 and the red light emitting portion 5 face the outside of the light emitting device 1 through the opening of the concave portion 2A.
- 1 functions as a light emitting surface 1A that emits light in a predetermined direction. That is, the blue light emitted from the blue LED 3, the green light emitted from the green light emitting unit 4, and the red light emitted from the red light emitting unit 5 are emitted from the light emitting surface 1A in a predetermined direction. It has become.
- the green light emitting section 4 is formed of a green phosphor and transparent resin! Speak.
- the green phosphor is a luminescent material of the green light emitting section 4 and is a fluorescent material that is excited by blue light emitted from the blue LED 3 and emits green light having a longer wavelength than blue light.
- the transparent resin is a binder of the green light emitting unit 4, and here, an epoxy resin which is a synthetic resin capable of transmitting visible light over the entire wavelength region is used.
- the green light emitting portion 4 is formed so as to fill the left portion in the figure from the bottom of the recess 2A to the opening.
- the green light emitting portion 4 is formed so as to cover the upper surface of the blue LED 3 and the side surfaces other than the right side surface in the figure. Further, the green light emitting part 4 has a larger volume than the red light emitting part 5 in the recess 2A.
- the green light emitting section 4 has a first light exit surface 4A at the opening of the recess 2A.
- the first light exit surface 4A is an upper surface in the drawing of the green light emitting section 4 formed in a planar shape, and overlaps the plane formed by the upper surface of the frame 2.
- the first light exit surface 4A is a surface that emits light emitted from the green light emitting unit 4 in a predetermined direction outside the light emitting device 1.
- blue light emitted from the blue LED 3 is also emitted from the first light exit surface 4A.
- the first light exit surface 4A together with a second light exit surface 5A described later, constitutes a light exit surface 1A that emits light emitted from the light emitting device 1 to the outside.
- the green light emitting unit 4 is opened on the light emitting surface 1A.
- the red light emitting portion 5 is formed of a red phosphor and a transparent resin.
- the red phosphor is a luminescent material of the red light emitting unit 5 and is excited by blue light emitted from the blue LED 3 and green light emitted from the green light emitting unit 4 to emit red light having a longer wavelength than that of green light. It is a phosphor that emits light.
- the transparent resin is a binder of the red light emitting unit 5, and here, like the green light emitting unit 4, an epoxy resin that can transmit visible light is used.
- the red light emitting portion 5 is formed so as to fill the right portion in the figure from the bottom of the recess 2A to the opening. As described above, the green light emitting portion 4 is also formed from the bottom of the recess 2A to the opening. Therefore, in the light emitting device 1, the thickness of the green light emitting portion 4 (the distance in the vertical direction in the figure) and the red light emitting portion are It is formed so as to be approximately equal to the thickness of 5. Further, the red light emitting unit 5 is formed so as to cover the right side surface of the blue LED 3 in the figure. Further, the red light emitting unit 5 occupies a smaller volume than the green light emitting unit 4 in the recess 2A.
- the red light emitting unit 5 also has a second light emitting surface 5A at the opening of the recess 2A, as with the green light emitting unit 4.
- the second light emission surface 5A is the upper surface in the figure of the red light emitting section 5 formed in a planar shape, and overlaps the plane formed by the upper surface of the frame 2.
- the second light emitting surface 5A is a surface that emits light emitted from the red light emitting unit 5 in a predetermined direction outside the light emitting device 1. Blue light emitted from the blue LED 3 is emitted from the second light emitting surface 5A. Are also released.
- the second light exit surface 5A together with the first light exit surface 4A, constitutes a light exit surface 1A that emits light emitted from the light emitting device 1 to the outside.
- the red light emitting unit 5 is opened at the light emitting surface 1A.
- the partition plate 6 is attached as a light shielding part from the opening of the recess 2A by being inserted into the insertion part 2B formed on the frame 2. It has been.
- the partition plate 6 is formed as a rectangular parallelepiped resin-made plate extending in the depth direction of the recess 2A in the vicinity of the blue LED and also extending in the width direction of the recess 2A. ing. Further, the entire surface of the partition plate 6 is subjected to the same texture treatment as that of the frame 2 so that visible light can be efficiently reflected.
- the light-emitting device 1 of the present embodiment is configured as described above. Therefore, when blue light is emitted from the blue LED 3, a part of the blue light is used as excitation light by the green light emitting unit 4, and green light is emitted from the green light emitting unit 4. The other part of the blue light emitted from the blue LED 3 is used as excitation light by the red light emitting unit 5, and red light is emitted from the red light emitting unit 5. Further, a small amount of the green light emitted from the green light emitting section 4 is incident on this gap force red light emitting section 5 where the green light emitting section 4 and the red light emitting section 5 are in contact with each other, absorbed, and used as excitation light. Will be used. Then, the blue light, green light and red light emitted in this way are emitted from the light exit surface 1A in predetermined directions.
- the light-emitting device 1 can exhibit high luminous efficiency and color rendering. That is, a partition plate 6 is provided between the green light emitting unit 4 and the red light emitting unit 5 to prevent the light emitted from the green light emitting unit 4 from entering the red light emitting unit 5. The amount of light emitted by 4 can be suppressed by the red light emitting unit 5, thereby improving the light emission efficiency and color rendering of the light emitting device 1. In addition, since it is possible to suppress variation in the components of light emitted from the light emitting device 1, the color reproducibility of the light emitting device 1 can be improved.
- the green light emitted from the green light emitting part 4 is incident on the red light emitting part 5, but the amount of light is very small. If it is efficient, the color rendering will not deteriorate.
- the green light emitted from the green light emitting part 4 is completely red by partitioning the part other than the part where the blue LED 3 and the red light emitting part 5 are in contact with the partition plate 3. If the light is not incident on the color light emitting portion 5, the light emission efficiency and the color rendering properties can be improved more reliably.
- the surface of the frame 2 and the surface of the partition plate 6 can reflect all visible light efficiently, blue light emitted from the blue LED 3, green light emitted from the green light emitting unit 4, And the red light emitted from the red light emitting part 5 is emitted from the light emitting surface 1A without being absorbed by the frame 2 or the partition plate 6, so that each light can be used effectively and the luminous efficiency can be improved. it can.
- FIGS. 2 (a) and 2 (b) are diagrams schematically showing a main part of a light emitting device as a second embodiment of the present invention
- FIG. 2 (a) is a sectional view thereof
- the green light emitting part 14 and the red light emitting part 15 are shown with increased thicknesses for the sake of explanation, but the green light emitting part 14 and the red light emitting part 15 cannot actually be visually confirmed. It is assumed that this is a thin film-like part.
- the light emitting device 11 of this embodiment includes a frame 12, a blue LED (blue light emitting unit) 13 as a light source, and a green light emitting as a first light emitting unit.
- the frame 12 is a base made of resin for holding the blue LED 13, the green light emitting unit 14, the red light emitting unit 15, the partition wall 16 and the beam 19 like the frame 2 of the first embodiment.
- a trapezoidal concave section (dent) 12A having an opening at the upper side in the figure is formed. Therefore, as in the first embodiment, the light emitted from the light emitting device 11 can be given directivity, and the emitted light can be used effectively.
- the frame 12 has a metal plating applied to the surface of the recess 12A so that the light hitting the surface of the frame 12 can be emitted from the light emitting device 11 in a predetermined direction (here, upward in the figure). It has become.
- a beam 19 is installed so that one force of the upper part of the recess 12A is also applied to the other.
- the beam 19 is formed of a material that transmits at least blue light emitted from the blue LED 13, green light emitted from the green light emitting unit 14, and red light emitted from the red light emitting unit 15.
- the beam 19 has an electrode (not shown) below, and the blue LED 13 is electrically connected to the electrode. I can supply power.
- a blue LED 13 is installed as a light source.
- the blue LED 13 is the same as the blue LED 3 of the first embodiment and functions in the same manner, and therefore the description thereof is omitted here.
- the blue LED 13 is fixed to the beam 19 with a silver paste 17 and is supplied with power through an electrode by a wire 18. At this time, the silver paste 17 and the wire 18 of the light emitting device 11 are the same as the silver paste 7 and the wire 8 of the first embodiment, respectively.
- a green light-emitting part 14 as a first light-emitting part and a red light-emitting part 15 as a second light-emitting part are formed in a film shape having the same film thickness.
- the green light emitting portion 14 and the red light emitting portion 15 cover the entire inner surface of the recess 12A of the frame 12.
- the light emitting device 11 is set so that a predetermined direction in which light is emitted is an upward direction in the figure.
- the surface where the green light emitting part 14 is not in contact with the frame 12 and the partition wall 16, and the red light emitting part functions as a light emitting surface 11A from which the light emitting device 11 emits light in a predetermined direction, and the green light emitting portion 14 and the red light emitting portion 15 are respectively
- the light exit surface 11 A is open. Therefore, the blue light emitted from the blue LED 13, the green light emitted from the green light emitting unit 14, and the red light emitted from the red light emitting unit 15 are emitted from the light emitting surface 11A in a predetermined direction. It is summer. The light emitted from the blue LED 13 is not directly emitted in a predetermined direction, and is reflected by the frame 12 and emitted to the outside.
- the space between the bottom force of the concave portion 12A of the frame 12 and the lower surface of the beam 19 is a material that transmits at least blue light emitted by the blue LED 13, green light emitted by the green light emitting portion 14, and red light emitted by the red light emitting portion 15. Molded with (not shown)!
- the green light emitting unit 14 is formed by depositing the same material as that of the green light emitting unit 4 of the first embodiment on the bottom surface and the slope of the concave portion 12A of the frame 12. Further, the green light emitting portion 14 is formed from the right end of the surface of the recess 12A to the left side in the figure from the center portion (here, the left side from the position corresponding to the left end of the blue LED 13). For this reason, the green light emitting unit 14 has a larger volume than the red light emitting unit 15. On the other hand, the red light emitting portion 15 is formed by depositing the same material as the red light emitting portion 5 of the first embodiment on the surface of the recess 12A of the frame 12.
- the red light emitting portion 15 is formed on the bottom portion and the inclined surface, with the green light emitting portion 14 formed on the surface of the concave portion 12A. Since the green light emitting part 14 is formed from the right end of the frame 12 to the right side in the figure rather than the center part, the red light emitting part 15 is formed farther from the blue LED 13 than the green light emitting part 14. Will be.
- the blue light emitted from the blue LED 13 is more incident on the green light emitting portion 14 than on the red light emitting portion 15.
- a partition wall 16 is formed at the boundary portion between the green light emitting unit 14 and the red light emitting unit 15.
- the partition wall 16 extends in the depth direction of the recess 12A and the bottom surface force of the recess 12A extends in the vicinity of the blue LED 13, and as a rectangular solid resin board extending in the width direction of the recess 12A. Bonded to 12. Further, the entire surface of the partition wall 16 is subjected to the same texture treatment as that of the frame 12 so that visible light can be efficiently reflected.
- the light emitting device 11 of the present embodiment is configured as described above. Therefore, when blue light is emitted from the blue LED 13, a part of the blue light is used as excitation light in the green light emitting part 14, and the green light emitting part 14 also emits green light. The other part of the blue light emitted from the blue LED 13 is used as excitation light by the red light emitting unit 15, and red light is emitted from the red light emitting unit 15. Furthermore, a small amount of the green light emitted from the green light emitting part 14 enters the red light emitting part 15 through the upper part of the cutting wall 16 and is absorbed and used as excitation light. .
- the light emitting device 11 can exhibit high luminous efficiency and color rendering. That is, a partition wall 16 is provided between the green light emitting unit 14 and the red light emitting unit 15 to prevent the light emitted from the green light emitting unit 14 from entering the red light emitting unit 15. The amount of light emitted from the portion 14 is absorbed by the red light emitting portion 15, thereby improving the luminous efficiency and color rendering of the light emitting device 11. In addition, since variation in the components of light emitted from the light emitting device 11 can be suppressed, the color reproducibility of the light emitting device 11 can be improved.
- a part of the green light emitted from the green light emitting part 14 passes through the upper part of the partition wall 16 and enters the red light emitting part 15, but the amount thereof is very small, so the light emission efficiency is reduced in color rendering. There is nothing to do.
- the partition wall 16 is provided so as to prevent the green light emitted from the green light emitting part 14 from entering the red light emitting part 15 at all, the light emission efficiency can improve the color rendering property more reliably.
- the surface of the frame 12 and the surface of the partition wall 16 can reflect all visible light, blue light emitted from the blue LED 13, green light emitted from the green light emitting unit 14, and red light emission. Since the red light emitted from the part 15 is emitted from the light exit surface 11A without being absorbed by the frame 12 or the partition wall 16, each light can be used effectively and the luminous efficiency can be increased.
- the same operations and effects as the light emitting device 1 of the first embodiment can be obtained.
- the application of the light emitting device of the present invention is not limited, and can be applied to any application using light. Specific examples of the application include lighting, a backlight unit for display device, and a display device (display).
- the light-emitting device of the present invention is used as illumination, there is no particular limitation.
- it can be used in various modes as illumination, such as a camera flash, a video camera light, and indoor and outdoor lighting fixtures.
- the light emitting device of the present invention has different wavelengths (that is, colors) of light emitted from the first light emitting unit and the second light emitting unit, but the light emitted from the light emitting device is emitted from the light emitting device. And then spread sufficiently from the light source, the first light emitter, and the second light emitter. Since the light is visually mixed in a sufficiently mixed state, the light is visually perceived as a target color without being separated into components when visually observed. If the light-emitting device of the present invention is used as illumination, light with high color rendering properties can be irradiated with high luminous efficiency.
- the light-emitting device of the present invention can be used as a knocklight unit by combining with an optical member such as a light guide plate.
- a display backlight unit is attached to a display of a mobile phone to illuminate the liquid crystal display unit from the back side.
- the light-emitting device of the present invention is attached to the display backlight unit. Can be used.
- FIG. 3 is a diagram schematically showing a cross-section of the main part of the display 21 of the mobile phone in order to explain an example of a backlight unit using the light emitting device of the present invention.
- a light guide plate 23 having a size corresponding to the entire back surface of the liquid crystal display unit 22 is attached to the back surface of the liquid crystal display unit 22.
- the light guide plate 23 is formed as a flat plate-shaped optical member made of a transparent material that transmits all light in the visible region, and a light emitting device 24 is attached to the side thereof.
- the light emitting device 24 is attached so that emitted light can be incident on the light guide plate 23, and the light guide plate 23 and the light emitting device 24 constitute a display backlight unit 25.
- the light emitted from the light emitting device 24 enters the light guide plate 23, and the surface force of the light guide plate 23 facing the liquid crystal display unit 22 is also emitted toward the liquid crystal display unit. Thereby, the liquid crystal display unit 22 can be brightly illuminated.
- the wavelengths (that is, the colors) of the light emitted from the first light emitting unit and the second light emitting unit of the light emitting device 24 are different, but the light emitted from the light emitting device 24 is in the light guide plate 23. Because they mix and become uniform, there is no risk of uneven color when the LCD 22 is illuminated.
- the light-emitting device of the present invention When the light-emitting device of the present invention is used for a relatively large display device (display) or the like, the light-emitting device of the present invention may be used as a backlight that directly illuminates the liquid crystal display unit with a back force. . Even in such a case, since the light emitted from the light emitting device is mixed and uniformed before reaching the liquid crystal display unit, there is no possibility of uneven color.
- a diffusion plate, a light diffusion layer, or the like is used. If the light emitted from the light emitting device is diffused, the light can be made more uniform. Such a method is preferably used so as not to leave even a slight unevenness in emission color, such as an indicator of an audio device.
- the light emitting device of the present invention when used as a knock light or a backlight unit of a display device, it is possible to provide a display having good color reproducibility and high luminous efficiency (luminance).
- the display device of the present invention will be described in detail while showing a third embodiment of the present invention.
- the third embodiment of the present invention will be described below with reference to the drawings.
- the present invention is not limited to the following third embodiment, and may be arbitrarily modified without departing from the scope of the present invention. can do.
- FIG. 4 to 6 are for explaining the third embodiment of the present invention
- FIG. 4 is a schematic exploded perspective view for explaining the outline of the display device
- FIG. 5 is a schematic diagram of the backlight unit
- FIG. 6 is a schematic cross-sectional view for explaining the main part of the backlight unit.
- the display device of this embodiment includes a knocklight unit and an image forming unit.
- the display device of the present embodiment is configured to include other components such as a diffusion plate and a light guide plate as appropriate.
- FIG. 4 is a schematic exploded perspective view showing the display device of the present embodiment.
- the display device of this embodiment includes a backlight unit 101, a diffuser plate 102, and an image forming unit 103.
- the knock light unit 101 is a member that emits white light as a backlight toward the image forming unit 103 via the diffusion plate 102.
- the backlight unit 101 emits white light when the light immediately after being emitted from the knock light unit 101 is white only immediately after being emitted from the knock light unit 101.
- the term “white light that does not sufficiently diffuse and becomes white when it reaches the image forming unit 103” is diffused before reaching the image forming unit 103, and becomes white.
- FIG. 5 shows a schematic plan view of the backlight unit 101 used in the display device of the present embodiment. A plane view is shown.
- the knock light unit 101 has a plurality of light emitting portions 105 (seven in this case) for emitting white light on a substrate 104 as a frame. Yes.
- Each light emitting unit 105 includes a green light emitting unit 106 as a first light emitting unit and a red light emitting unit 107 as a second light emitting unit.
- the substrate 104 is a base for providing the light-emitting portion 105, and can be configured in the same manner as the frame in the above-described light-emitting device. Accordingly, the shape, dimensions, etc. can be arbitrarily set according to the shape, dimensions, application, etc. of the display device.
- the shape of the light emitting portion 105 of the substrate 104 includes a plate shape, a cup shape, and the like. Also, it is desirable that the surface has an appropriate shape such as a flat surface, a curved surface, and an uneven surface, depending on the application.
- an arbitrary force is also applied to the material of the substrate 104.
- the substrate 104 it is preferable to form the substrate 104 with a material that does not transmit at least green light.
- a material that transmits green light as the material of the substrate 104, in that case, the surface of the substrate 104 is coated with a material that does not transmit at least green light. It is preferable to perform processing to prevent it. The point of preventing the transmission of green light will be described in detail in the description of the light emitting unit 105.
- the substrate 104 As a specific example of the substrate 104, a frame similar to the frame in the above-described light-emitting device can be given. Among these, as the inorganic material, ceramitas and as the organic material, glass epoxy resin are preferable. In addition, the material of the substrate 104 may be used alone, or two or more materials may be used in any combination and ratio.
- the material of the substrate 104 is preferably a material with good heat dissipation.
- a material having high thermal conductivity For example, it is preferable to use a material having high thermal conductivity.
- the light source in the light emitting unit 105 (see blue light source 108 in Fig. 6) generates heat during use, but if the substrate 104 is made of a material with good heat dissipation, it will be stable even if heat is generated during use. It is because it becomes possible to continue using it.
- an insulating material for the substrate 104.
- the force on the substrate 104 is arbitrary color Usually white or silver It is preferable to use a color material. This is due to the following reason. That is
- a part of white light emitted from the light emitting unit 105 is reflected by the diffusion plate 102 or the image forming unit 103 or light incident from the outside of the display device is input to the image forming device 103 of the knock light unit 101.
- the light is reflected by a surface that emits white light toward the surface (hereinafter, referred to as “white light emitting surface” as appropriate), and the reflected light illuminates the image forming unit 103 from the back.
- the substrate 104 absorbs visible light, there is a possibility that the light emission efficiency may be lowered or the color shift may occur. Therefore, it is preferable that at least a portion to be the white light emitting surface of the substrate 104 is white or silver. Therefore, the white light emission surface of the substrate 104 is preferably formed of a white or silver material.
- the part facing the green light emitting part 106 and the red light emitting part 107 in the light emitting part 105 has a reflectance of at least one of the components of the light hitting that part.
- the reflectance of light in general is increased.
- the portion where the light hits is formed of a material having high reflectivity.
- a method for increasing the reflectance for example, the same method as that of the light emitting device described above can be used.
- the substrate 104 is provided with electrodes and wiring for supplying power to the light source.
- the electrodes and wirings may be formed in any way. However, in the case of forming a display device, it is preferable that a wiring pattern is formed on the back surface of the substrate 104 using a through hole, because manufacturing is easy.
- the material of the electrode and wiring is also arbitrary, and for example, Cu, Au-plated Cu, Ag-plated Cu, Al, Ag, or the like can be used.
- the substrate 104 is formed as a white plate-like substrate 104, and the surfaces of the green light emitting unit 106 and the red light emitting unit 107 are surfaces that can reflect light having a wavelength in the entire visible range. Assume that processing has been performed.
- the substrate 104 is provided with wiring 109 for supplying power to the blue light source 108 on the back surface, and further includes electrodes 110 at positions corresponding to the light emitting portions 105 (see FIG. 6). .
- FIG. 6 is a schematic cross-sectional view of the light emitting unit 105. As shown in FIG. Includes a green light emitting unit 106 as a first light emitting unit and a red light emitting unit 107 as a second light emitting unit. In addition, a blue light source 108 is provided in each of the green light emitting unit 106 and the red light emitting unit 107.
- the blue light source 108 is a light source that emits blue light in order to emit excitation light of the luminescent substance contained in the green light emitting unit 106 and the red light emitting unit 107, similarly to the light source in the light emitting device described above. It is also a light source for emitting blue light as a component of white light emitted by the knock light unit 101. That is, part of the blue light emitted from the blue light source 108 is absorbed as excitation light by the luminescent materials in the green light emitting unit 106 and the red light emitting unit 107, and another part is the knock light unit 101. To the image forming unit 103.
- the type of the blue light source 108 is arbitrary, and an appropriate one can be selected according to the use and configuration of the display device. However, normally, the emitted light with a biased light distribution is widely diffused. It is preferable to use it.
- Examples of the blue light source 108 include the same ones as exemplified in the description of the light emitting device, but an inexpensive LED is usually preferable.
- the side surface be tapered.
- the material of the LED package is arbitrary, and for example, ceramics, PPA (polyphthalamide), or the like can be used as appropriate.
- the color of the package is preferably white or silver from the viewpoint of improving the color reproducibility of the display device, and from the viewpoint of increasing the light emission efficiency of the backlight unit 101, It is preferable that the reflectance is increased.
- the color and reflectance of the wiring are the same as those of the substrate 104 and the LED package.
- the blue light source 108 When the blue light source 108 is attached to the substrate 104, the specific method is arbitrary. 1S
- the blue light source 108 can be attached using solder.
- solder the kind of solder is arbitrary, the thing similar to what was illustrated by description of the light-emitting device is mentioned, for example.
- high current type LEDs and laser diodes where heat dissipation is important are used as the blue light source 108. In this case, it is effective to use the solder for installing the blue light source 108 because the solder exhibits excellent heat dissipation.
- the blue light source 108 is attached to the substrate 104 by means other than solder, for example, the same ones as exemplified in the description of the light emitting device can be cited.
- the adhesive is energized and power is supplied to the blue light source 108 as in the case of using solder. It is also possible to be able to supply. Furthermore, it is preferable to mix these conductive fillers because heat dissipation is improved.
- the method of supplying power to the blue light source 108 is also arbitrary, and examples include the same method as exemplified in the description of the light emitting device.
- one blue light source 108 may be used alone, or two or more light sources may be used in combination. Further, the blue light source 108 may be used alone, or two or more of them may be used in combination. Also, the blue light source 108 includes one blue light source 108, the green light emitting unit 106 and the red light emitting unit 10 7. May be shared by two or more light emitting units 105, but in order to improve the color rendering of white light emitted from the knocklight unit 101, the green light emitting unit 106 and red A blue light source 108 is preferably provided for each of the light emitting units 107.
- the wavelength of the blue light emitted from the blue light source 108 is arbitrary as long as the knock light unit 101 can emit light of a desired wavelength (in this embodiment, white light).
- a desired wavelength in this embodiment, white light.
- the wavelength of blue light emitted from the blue light source 108 used for the green light emitting unit 106 is usually 350 or more, preferably 400 nm or more, more preferably 430 nm or more, and usually 520 ⁇ m or less, preferably 500 nm or less. More preferably, 480 nm or less is desirable.
- the wavelength of blue light emitted from the blue light source 108 used for the red light emitting unit 107 is usually 400 nm or more, preferably 450 nm or more, more preferably 500 nm or more, and usually 600 nm or less.
- the blue light source 108 it is assumed that LEDs emitting blue light are used for the green light emitting unit 106 and the red light emitting unit 107, respectively. Further, as shown in FIG. 6, the substrate 104 includes wiring 109 formed on the back surface thereof, and an electrode 110 connecting each blue light source 108 and the wiring 109! / Suppose that the blue light source 10 8 can be supplied with power.
- the green light emitting unit 106 which is the first light emitting unit, is excited by blue light emitted from the blue light source 108 and emits at least one kind of green light that includes a component of a green light emitting region having a longer wavelength than the blue light. It is formed including a luminescent material (green luminescent material).
- the green light emitting part 106 is formed as a filling part (concave part) formed in the substrate 104 filled with the above-mentioned light emitting substance. Therefore, the green light emitting portion 106 is formed in a shape corresponding to the shape of the filling portion. Although there is no particular limitation on the shape of the green light emitting unit 106, normally, for example, if it is cup-shaped as shown in FIG. This is preferable because the luminous efficiency can be increased.
- the green light emitting units 106 can be provided independently at one place or divided into two or more places, and the same number as the number of red light emitting units 107 may be provided. Different numbers may be provided.
- the green light emitting unit 106 receives the blue light emitted from the blue light source 108, and thereby the luminescent material emits light using the received blue light as excitation light.
- the emitted light (green light) is emitted toward the image forming unit 103 as a component of white light emitted from the backlight unit 101.
- the red light emitting unit 107 which is the second light emitting unit, is excited by the blue light emitted from the blue light source 108, and contains the blue light and the component of the red light emitting region having a longer wavelength than the green light. It is formed to contain at least one luminescent material (red luminescent material) that can emit! Usually, like the green light emitting part 106, the red light emitting part 107 is also a filling part formed on the substrate 104. It is formed as (recess) filled with the above-mentioned luminescent material. Therefore, the shape of the red light emitting unit 107 is also formed according to the shape of the filling unit. The shape of the red light emitting unit 107 is not particularly limited, but it is usually preferable that the red light emitting unit 107 has a cup shape like the green light emitting unit 106.
- the red light emitting units 107 can be provided alone at one place, or divided into two or more places, and the same number as the number of green light emitting units 106 can be provided. A different number may be provided.
- red light emitting unit 107 blue light emitted from the blue light source 108 is received, and thereby the luminescent material emits light using the received blue light as excitation light.
- the emitted light (red light) is emitted toward the image forming unit 103 as a component of white light emitted from the backlight unit 101.
- the green light emitting unit 106 and the red light emitting unit 107 are each formed at least partially, preferably all independently. That is, by forming the green light emitting unit 106 and the red light emitting unit 107 separately, at least a part, preferably all, of the green light emitted from the green light emitting unit 106 is not incident on the red light emitting unit 107. To form. Normally, the white light emitted from the knocklight unit 101 toward the image forming unit 103 is emitted from the green light emitting unit 106 to such an extent that the light emission efficiency and color reproducibility are high enough to withstand practical use. It is only necessary to prevent the green light from entering the red light emitting unit 107.
- the green light emitting unit 106 it is preferable to prevent all green light emitted from the green light emitting unit 106 from entering the red light emitting unit 107.
- the intensity of the red light emitted from the red light emitting unit 107 can be prevented from being excessively increased, so that the color rendering property of the white light emitted by the knock light unit 101 can be prevented. There is also an advantage that can be increased.
- the green light emitting unit 106 and the red light emitting unit 107 are usually formed by filling the respective light emitting materials in the filling unit formed on the substrate 104, the green light emitting unit 1 is formed by the substrate 104. Green light emitted from 06 is blocked and is prevented from entering the red light emitting unit 107. That is, it functions as the light-shielding portion described above in the description of the partial force light-emitting device between the green light-emitting portion 106 and the red light-emitting portion 107 of the substrate 104.
- the material of the substrate 104 is made a material that can at least block light of green light, or the surface is coated.
- a wall portion for preventing the transmission of green light may be provided between the green light emitting unit 106 and the red light emitting unit 107.
- the convex portion is used as the above-mentioned wall portion to more reliably prevent the transmission of green light. be able to.
- the shape and dimensions of the wall are arbitrary.
- the material of the wall portion is also arbitrary, and the same material as the substrate 104 can be used. Further, as with the substrate 104, it is preferable to increase the reflectance of the wall surface. In this case, this wall portion also functions as the above-described light shielding portion.
- both the green light emitting unit 106 and the red light emitting unit 107 emit white light. It is desirable that the surface is open to the outside. That is, the green light emitted from the green light emitting unit 106 does not pass through the red light emitting unit 107, and the white light emitting surface force is also emitted toward the image forming unit 103, and the red light emitted from the red light emitting unit 107 is green. It is desirable that the white light emitting surface force is also emitted toward the image forming unit 103 without passing through the light emitting unit 106.
- a protective layer is formed on the white light emitting surface, or a cover is attached to the knock light unit 101, and the green light and red light pass through other members such as the protective layer and the cover, and the backlight unit 101. Even when the light is emitted to the outside, the green light emitting unit 106 and the red light emitting unit 107 are opened as long as green light and red light can pass through other members such as a protective layer and a cover. [0202] When the green light emitting unit 106 and the red light emitting unit 107 are opened on the white light emitting surface as described above, the green light and the red light are respectively absorbed by other light emitting substances or shielded by other parts. It becomes possible to reduce (or eliminate) the degree of weakening the strength.
- the light emission efficiency of the knocklight unit 101 can be increased. Furthermore, the variation in the white light component emitted from the backlight unit 101 can be reduced, and the color rendering can be improved. In addition, since it is possible to reliably emit white light using the three primary colors of blue light, green light, and red light, by appropriately selecting the blue light source 108, the green light emitting unit 106, and the red light emitting unit 107, This can improve the color reproducibility of the display device.
- the backlight unit 101 can improve the light emission efficiency in the same manner as in the case of a light emitting device, but pays special attention to its use as a display device.
- the mechanism that can increase the luminous efficiency of the backlight unit 101 will be described in detail again in comparison with the conventional technology.
- the light emitting unit 105 does not divide into the green light emitting unit 106 and the red light emitting unit 107, and emits green light and red light.
- white light was synthesized with a luminescent substance! / ⁇ , part of the green light was absorbed and consumed by the luminescent substance emitting red.
- the green light is absorbed by the light emitting material that emits red light, and the red light becomes stronger, so that the balance of the white light component emitted from the knocklight unit 101 varies, and the color reproducibility of the display device is improved. It was decreasing.
- green light can be prevented from entering the red light emitting unit 107, so that the green light is absorbed by the red light emitting unit 107. It can suppress that intensity becomes weak. Therefore, the light emission efficiency of knocklight 101 can be improved as compared with the prior art.
- the red light emitting unit 107 can suppress the emission of light by absorbing the green light, the variation in the white light component emitted from the backlight unit 101 is reduced, and the color rendering of the backlight unit 101 is reduced. It can also improve sex. As a result, the color rendering properties and color reproducibility of the display device can be improved.
- the green light emitting unit 106 and the red light emitting unit 107 are emitted.
- the arrangement of the light emitting unit 107 is arbitrary, but the green light emitting unit 106 and the red light emitting unit 107 are combined so as to be able to emit the desired white light, and as the light emitting unit 105 as in this embodiment, It is preferable to install. That is, the color of the white light is determined according to the ratio of the intensity and the intensity of each of the blue light, the green light, and the red light.
- the green light emitting unit 106 that emits the white light of the target color and the red light.
- the number of light emitting units 105 that are unit units is increased. For example, design and manufacturing are simplified, which is preferable.
- one light emitting unit 105 is provided with one green light emitting unit 106 and one red light emitting unit 107, but the number thereof is arbitrary, and two or more may be provided as appropriate. .
- the arrangement of the green light emitting unit 106 and the red light emitting unit 107 in the light emitting unit 105 is optional, and it is possible to arrange them side by side as in this embodiment. However, it may be arranged in a more complicated shape.
- each light emitting portion 105 is represented by a figure in which equilateral triangles are continuous (see broken lines in FIG. 5). It is preferable to arrange so that it is located at the apex of each triangle.
- the dimensions of the green light emitting unit 106 and the red light emitting unit 107 are also arbitrary, but are usually set according to the target white light.
- the white light is emitted from the backlight unit 101 to the image forming unit 103 as light obtained by combining the blue light, the green light, and the red light. Therefore, the apparent color of white light also changes according to the intensity of blue light, green light and red light to be combined. For this reason, in order to create white light of the target color, the intensity of each of blue light, green light and red light is adjusted.
- the green light emitting unit 106 is relatively larger than the red light emitting unit 107, and when the green light 106 is desired to be weakened, the green light emitting unit 106 is relatively disposed with respect to the red light emitting unit 107. You can make it smaller.
- the method of adjusting the balance of the intensity of each of blue light, green light, and red light is not limited to the method of adjusting the dimensions of the green light emitting unit 106 and the red light emitting unit 107 described above. Any method can be employed.
- the ratio between the current value of power supplied to the blue light source 108 provided in the green light emitting unit 106 and the current value of power supplied to the blue light source 108 provided in the red light emitting unit 107 is adjusted, thereby The intensity of each of blue light, green light and red light may be adjusted so that the desired white light can be emitted.
- the blue light source 108 may be pulse-driven and adjusted according to its duty ratio. That is, the ratio between the pulse lighting time of the blue light source 108 provided in the green light emitting unit 106 and the pulse lighting time of the blue light source 108 provided in the red light emitting unit 107 is adjusted, and thereby blue light, green light, and The intensity balance of each red light may be adjusted so that the desired white light can be emitted.
- the ratio of the amount of the luminescent substance contained in each of the green light emitting unit 106 and the red light emitting unit 107 is adjusted to adjust the balance of the intensity of blue light, green light, and red light. Thereby, the target white light may be emitted.
- the green light emitting unit 106 is actually adjusted.
- the light emitted from the light source and the light emitted from the red light emitting unit 107 are adjusted. That is, white light generated by combining blue light, green light, and red light is combined with, for example, blue light and green light (hereinafter referred to as “short wavelength light” as appropriate) and blue light and red light.
- short wavelength light is emitted from the green light emitting part
- long wavelength light is emitted from the red light emitting part. The emitted light.
- the green light emitting unit 106 and the red light emitting unit 107 are controlled to emit light from each of the green light emitting unit 106 and the red light emitting unit 107. It is better to adjust the color and intensity of the short wavelength light and long wavelength light.
- the short wavelength light (that is, light obtained by combining blue light and green light) has a chromaticity coordinate (X, y) force of normal (0.25, 0) as shown in FIG. 65), (0.43, 0.52), (0.32, 0.33) and (0.18, 0.33) (in the region I in Fig. 7), preferably ( 0. 27, 0. 53), (0. 34, 0. 49), (0. 27, 0. 34), and (0. 22, 0. 35). It is desirable that This is because the balance between brightness and color reproducibility is improved.
- the long wavelength light (light synthesized from blue light and red light) is opposite to the chromaticity coordinates of the short wavelength light with reference to the chromaticity coordinates of the target white light.
- the chromaticity coordinates can be determined.
- the light emitting unit 105 is arranged on the surface of the substrate 104 in the same shape (the upper surface is circular and the cross section is trapezoidal) one by one, and the green light emitting unit 1 It is assumed that it is formed by filling a luminescent material and a binder corresponding to 06 and red light emitting section 107, respectively. Further, as shown in FIG. 6, each light emitting unit 105 is arranged so that each light emitting unit 105 is positioned at the apex of each triangle of a figure in which equilateral triangles are continuous (see the broken line in FIG. 6). Therefore, the distances between the light emitting sections 105 are evenly arranged. [0214] [II 1-4. Composition of light emitting part]
- the green light emitting unit 106 which is the first light emitting unit, has a light emitting material that absorbs excitation light and emits green light.
- the red light emitting unit 107 as the second light emitting unit includes a light emitting material that absorbs excitation light and emits red light. Further, in the green light emitting unit 106 and the red light emitting unit 107, the respective light emitting materials are usually held on the substrate 104 by a binder.
- the light-emitting substance known substances can be appropriately selected and used.
- the emission itself is not limited by any mechanism such as fluorescence or phosphorescence.
- one kind of light emitting substance may be used alone, or two or more kinds may be used in any combination and ratio.
- the wavelength of the green light emitted from the luminescent substance that emits green light by absorbing the excitation light used in the green light emitting unit 106 is arbitrary as long as the knocklight unit 101 can emit white light. However, preferably, a wavelength range similar to the preferable emission wavelength range of the luminescent substance used in the first light emitting unit described in the description of the light emitting device is used.
- the wavelength of the red light emitted by the light emitting material that absorbs the excitation light and emits red light used for the red light emitting unit 107 is arbitrary as long as the knocklight unit 101 can emit white light.
- the luminescent substance one having a luminous efficiency of usually 40% or more, preferably 45% or more, more preferably 50% or more, still more preferably 55% or more, and most preferably 60% or more is used. It is preferable.
- the luminous efficiency shown here is a value expressed as the product of quantum absorption efficiency and internal quantum efficiency.
- the luminescent materials of the green light emitting unit 106 are the same as those described as examples of the luminescent materials suitable for the first light emitting unit in the description of the light emitting device. Is mentioned.
- the luminescent material of the red light emitting unit 107 in the description of the above light emitting device, examples of materials suitable for the luminescent material of the second light emitting unit are given. The same thing is mentioned.
- the luminescent substance those emitting green light and those emitting red light are usually used in the form of particles.
- the particle diameter of the luminescent material particles is arbitrary, but is usually 150 ⁇ m or less, preferably 50 ⁇ m or less, more preferably 20 ⁇ m or less, and further preferably 15 / z m or less. Beyond this range, the variation in the color of the white light emitted by the knocklight unit 101 increases, and when the luminescent material and the sealing material (binder) are mixed, the luminescent material should be applied uniformly. May become difficult.
- the luminous efficiency may be reduced.
- green light emitting unit 106 and the red light emitting unit 107 are formed without using a binder, for example, they can be formed in the same manner as the first light emitting unit and the second light emitting unit in the light emitting device described above.
- the red light emitting unit 107 may contain a light emitting material that emits green light in addition to a light emitting material that emits red light, a binder, and other components. However, in order to obtain a larger light flux, it is preferable that the concentration of the luminescent material that emits green light contained in the red light emitting unit 107 is small. The red light emitting unit 107 does not contain a luminescent material that emits green light. It is more preferable.
- the green light emitting unit 106 does not normally contain a light emitting material that emits red light.
- a light emitting material that emits red light may be included as long as the luminous flux of green light is not reduced.
- the green light-emitting part 106 contains a light-emitting substance that emits red light, and the percentage of the light-emitting substance that emits red light contained in the green light-emitting part 106 is usually 40% by volume or less. Is more desirable.
- a luminescent material that emits red light is excited by green light
- a luminescent material that emits red light from the green light emitted by the luminescent material of the green light emitting unit 106 in the green light emitting unit 106.
- the light emitting materials in the green light emitting section 106 and the red light emitting section 107 should be adjusted so that the light is not absorbed too much.
- the green light emitting unit 106 and the red light emitting unit 107 may contain a binder in addition to the light emitting material.
- the binder is usually used to collect powdery or particulate light-emitting substances or attach them to the substrate 104.
- the binder used for the backlight unit 101 There are no restrictions on the binder used for the backlight unit 101, and any known one can be used.
- the knock light unit 101 is a transmission type, that is, as shown in FIG. 6, the light emitted from the blue light source 108, the green light emitting unit 106, and the red light emitting unit 107 is emitted from the green light emitting unit 106 or the red light emitting unit 107.
- the binder serves as each component of white light emitted from the knock light unit 101 (that is, blue light, green light, and red light). It is desirable to select one that transmits light.
- binder examples include the same light emitting devices as those described above.
- the viscosity of the resin is arbitrary, but a binder having an appropriate viscosity is selected according to the particle size and specific gravity of the luminescent material to be used, particularly the specific gravity per surface area. It is desirable to use it.
- the particle diameter of the luminescent material particles is 2 ⁇ -5 / ⁇ m and the specific gravity is 2-5.
- Binders may be used alone or in combination of two or more in any combination and ratio.
- the ratio of the light emitting material to the binder is not limited, but the ratio of the light emitting material to the binder is usually 0.01 or more, preferably 0.0. It is desirable that it is 05 or more, more preferably 0.1 or more, and usually 5 or less, preferably 1 or less, more preferably 0.5 or less.
- the knocklight unit 101 when the knocklight unit 101 is of a transmissive type, it is desirable that the luminescent material is appropriately dispersed in the green light emitting unit 106 and the red light emitting unit 107 in order to obtain a higher luminous flux.
- the knock light unit 101 is of a reflective type (that is, the light emitted from the blue light source 108, the green light emitting unit 106, and the red light emitting unit 107 is reflected by the green light emitting unit 106 or the red light emitting unit 107). What is emitted outside the backlight unit without passing through 107.
- the luminescent material in order to obtain a higher luminous flux, it is preferable that the luminescent material is packed at a high density. Therefore, the thread of the luminescent material should be set according to the use of the display device, the type and physical properties of the luminescent material, the type and viscosity of the binder, taking these into consideration.
- the emission color of white light emitted from the backlight unit 101 is not only normal white light with chromaticity coordinates (X, y) of (0.33, 0.33) but also liquid crystal plates and displays to be combined. It can be arbitrarily changed to correct the transmission characteristics of the image forming unit such as a plate, diffuser plate, light guide plate, etc., for example, color coordinate (X, y) force. 28, 0. 25), (0. 25 , 0.28), (0.34, 0.40) and (0.40, 0.34) are also possible.
- the light emitting material may contain other components, and the green light emitting portion 106 and the red light emitting portion 107 may be formed of the light emitting material and the binder and other components used as appropriate. Any other known additive with no particular limitation can be used. For example, a light emitting device similar to that described above can be used.
- the green light emitting portion 106 and the red light emitting portion 107 can be manufactured by any method without any particular limitation. For example, it can be manufactured in the same manner as the first light-emitting portion and the second light-emitting portion in the light-emitting device described above.
- the diffusion plate 102 is a member that diffuses light emitted from the backlight unit 101. As shown in FIG. 4, the diffusion plate 102 is provided between the backlight unit 101 and the image forming unit 103, and the light emitted from the backlight unit 101 is contained in the diffusion plate 102. The light is diffused at the portion, and is emitted as white light to the image forming unit 103.
- the shape, material, dimensions, and the like are not limited to the specific configuration of the diffusion plate 102.
- a well-known diffusion plate can be used as appropriate.
- a sheet having irregularities on the front and back is used.
- a structure in which fine particles such as synthetic resin and glass are dispersed in a binder such as synthetic resin can be used.
- light diffusion is caused by a difference in refractive index between the noinda and the fine particles. It has become.
- the sheets, binders, fine particles, and the like used in this case are materials that can normally transmit each component of white light emitted from the backlight unit 101, that is, blue light, green light, and red light. It is formed by.
- the image forming unit 103 is a member that irradiates the white light emitted from the knock light unit 101 to the back side and forms an image on the front side. There is no particular limitation as long as it can form an image and transmit at least part of the irradiated backlight, and a known member having any shape, size, material, and the like can be used.
- Specific examples of the image forming unit 103 include a liquid crystal unit used for a liquid crystal display and the like, a sign used for an internal illumination sign, and the like.
- a color filter for example, as an example of a liquid crystal unit, a color filter, a transparent electrode, an alignment film, a liquid crystal, an alignment film, a liquid crystal layer force in which the transparent electrode overlaps in the above order, and a container such as a glass cell with a polarizing film attached to the front and back.
- a container such as a glass cell with a polarizing film attached to the front and back.
- maintained is mentioned.
- the image formed on the liquid crystal unit can be clearly displayed on the surface side of the liquid crystal unit.
- the display device may display the image formed on the image forming unit on the surface side of the image forming unit.
- An image may be projected and displayed on some projection surface. Examples of this are: For example, a liquid crystal projector or the like can be given.
- the backlight unit 101 illuminates the sign with white light (backlight) from the back side, so that the image formed on the sign is displayed on the sign. It can be clearly displayed on the surface side.
- the image formed on the image forming unit 103 is arbitrary, and may be a character or an image.
- the wiring 109 and the blue light source 108 of the backlight unit 101 can be emitted to the blue light source 108 when used.
- Appropriate power is supplied through electrode 110.
- the blue light source 8 supplied with power emits blue light having an intensity corresponding to the supplied power, part of which is emitted as a component of white light to the diffusion plate 102, and the other part emits green light correspondingly. Absorbed by the luminescent material in part 106 or red light emitting part 107.
- the green light emitting unit 106 is excited by the blue light absorbed by the luminescent material to emit green light, and this green light is emitted to the diffusion plate 102 as a component of white light. Further, the red light emitting unit 107 is excited by the red light absorbed by the luminescent material to emit red light, and this red light is also emitted to the diffusion plate 102 as a component of white light. At this time, since the green light emitting unit 106 and the red light emitting unit 107 are provided independently of each other, the green light is not absorbed by the light emitting material in the red light emitting unit 107, and thus the luminous flux of the green light is reduced. Do not disturb the balance of white light components.
- Blue light, green light, and red light emitted from the knock light unit 101 are incident on the diffusion plate 102, diffused in the diffusion plate 102, and emitted to the image forming unit 103.
- the light emitted from the knock light unit 101 is diffused by the diffusing plate 102 even when the light is not sufficiently diffused before entering the diffusing plate 102 and is viewed as a discrete color. Therefore, when the light is emitted to the image forming unit 103, it becomes a good white light visually recognized as white.
- the image forming unit 103 irradiates the back surface with white light emitted from the diffusion plate 102. As a result, the image formed on the image forming unit 103 is clearly displayed on the surface of the image forming unit 103.
- the white light contains blue, green, and red light as components, and the white light component is well balanced, so that the color formed when the image formed on the image forming unit 103 is projected is displayed. The reproducibility is very good.
- the green light is not absorbed by the light emitting material in the red light emitting unit 107, it is possible to suppress the decrease in the luminous flux, thereby reducing the energy for generating the knock light. That is, the light emission efficiency of the backlight can be increased.
- the display device of the present invention is not limited to the above-described third embodiment, and can be arbitrarily modified and implemented without departing from the gist of the present invention.
- the green light emitting unit 106 or the red light emitting unit 107 may be formed in a reflective type as shown in FIG. That is, in the configuration of FIG. 8, the blue light source 108 is provided away from the substrate 104 by the beam 111, and the green light emitting portion 106 and the red light emitting portion 107 are applied and formed on the concave surface of the substrate 4.
- the wiring 109 and the electrode 110 are provided on the surface of the substrate 104 and the beam 111 so that power can be supplied to the blue electrode 108.
- the green light emitting unit 106 and the red light emitting unit 107 in FIG. 8 are configured in the same manner as in the third embodiment.
- part of the blue light emitted from the blue light source 108 is emitted toward the image forming unit 103 as one component of white light, and another part is directed toward the green light emitting unit 106 and the red light emitting unit 107. Be emitted.
- the green light emitting unit 106 and the red light emitting unit 107 formed on the concave surface are excited by blue light to emit green light and red light, so that the knock light unit 101 can emit white light. It has become.
- the green light emitting unit 106 and the red light emitting unit 107 are provided independently of each other, the green light is not absorbed by the luminescent material in the red light emitting unit 107, and therefore the light flux of the green light Can be suppressed, and the balance of white light components can be prevented from being disturbed.
- the parts denoted by the same reference numerals as those in FIGS. 4 to 7 are the same as those in FIGS.
- a green light emitting unit 106 and a red light emitting unit 107 are attached to a surface mount type frame. You may make it form using. Depending on the application of the display device, the backlight unit 101 using the surface mount type frame as described above may be used more often.
- An example of a specific configuration of the light emitting unit 105 using a surface-mounting type frame is as shown in FIG.
- FIG. 9 is a cross-sectional view schematically showing an example of the configuration of the light emitting unit 105 using a surface-mount type frame. The parts indicated by the same reference numerals as those in FIGS. 4 to 8 are shown in FIGS. Represents the same thing.
- the green light emitting unit 106 and the red light emitting unit 107 configured in the frame 112 are attached to one side surface of the substrate 104, and the green light emitting unit 106 and the red light emitting unit 107 are paired.
- the light emitting part 105 is formed.
- the frame 112 In addition to preventing the green light emitted from the green light emitting unit 106 from transmitting, the frame 112 also has a shape, size, and material (including points that pay attention to heat dissipation, color, and reflectance) in the third embodiment. It is preferable to form in the same manner as the substrate 104 described in detail in the form.
- the light emitting unit 105 includes a pair of frames 112, and each frame 112 is formed in a cup shape having a recess, and a wiring formed so as to connect the bottom of the recess and the lower portion of the frame 112. It is assumed that 113 is provided.
- a blue light source 108 connected to the wiring 113 is provided in each of the pair of frames 112, and one of the frames 112 is filled with a green light emitting substance and a binder, and the green light emitting unit 106 is filled. It is assumed that the other frame 112 is filled with a red light emitting material and a binder to form a red light emitting portion 107. Further, it is assumed that a through hole 114 is formed in the substrate 104, and an electrode 110 is attached to the through hole 114. Furthermore, power can be supplied to the electrode 110 from the wiring 109 formed on the back surface of the substrate 104, and the electrode 110 and the wiring 113 of the frame 112 are connected by the solder 115, so that the blue color is obtained.
- the power supply 108 can be supplied with power.
- the solder 115 supplies power to the blue light source 108, functions to fix the green light emitting unit 106 and the red light emitting unit 107 to the substrate 104, and heat generated by the green light emitting unit 106 and the red light emitting unit 107. It shall also have a function to dissipate heat.
- the green light emitting unit 106 and the red light emitting unit 107 are provided independently of each other, the green light is not absorbed by the light emitting substance in the red light emitting unit 107 at the time of light emission. It is possible to suppress the decrease and the balance of the white light component.
- a light guide plate that guides white light from the knock light unit 101 to the image forming unit 103 may be used. If the light guide plate is used, the backlight unit 101 can be disposed at a position other than the position corresponding to the image forming unit 103 as in the above embodiment, and the degree of freedom in designing the display device can be increased. .
- a known light guide plate can be arbitrarily used, including those using a mirror, a prism, a lens, an optical fiber, etc. that are not limited to the light guide plate.
- FIG. 10 is a cross-sectional view schematically showing the configuration of the display device using the light guide plate.
- the backlight unit 101 can be provided on the side of the image forming unit 103. That is, in the configuration of FIG. 10, the light guide plate 117 having the reflection film 116 on the back is used, and white light incident from the side of the light guide plate 117 (right side in the figure) is reflected by the reflection film 116, The guide is directed toward the diffusion plate 102 (upper side in the figure).
- the knock light unit 101 can be provided on the side of the image forming unit 103. 10, parts indicated by the same reference numerals as those used in FIGS. 4 to 9 are the same as those shown in FIGS.
- the display device may further include another member!
- an antireflection film, a field-of-view expansion film, a brightness enhancement film, a lens sheet, a protective cover, a heat sink, etc. can be appropriately attached.
- the configuration of the third embodiment may be realized by a light source or a light emitting material that emits light other than blue, red, and green. Furthermore, by providing the light emitting device with the third light emitting unit or by providing the knock light unit with the yellow light emitting unit, each of the light emitting device and the backlight unit is configured to include at least three light emitting units. But ⁇ .
- the chromaticity coordinate of the combined light (short wavelength light) of blue light and green light emitted from the green light emitting part is
- the frame shown in Fig. 9 is a surface mount type frame with a recess of about 2.5mm in diameter and about 0.9mm in depth.
- a blue LED is used as a blue light source at the bottom of the recess of the frame. (Cree, C460MB) was installed so that power could be supplied to the blue light source from the back of the board.
- the Ca Ce which is a luminescent material, is formed in the recess where the blue light source is attached.
- a green light emitting part was produced. At this time, the mixing ratio of the luminescent material and the binder was about 95: 5 by weight.
- X, y (0. 56, 0.27).
- Ca AlSiEu N 2 O is used as the luminescent material, and the mixing ratio of the luminescent material and the binder is overlapped.
- a red light emitting part was produced in the same manner as the green light emitting part except that the amount ratio was about 98: 2.
- white light having a chromaticity coordinate of (X, y) (0. 33, 0.33) is synthesized from the light emitted from the green light emitting part and the red light emitting part.
- the emission intensity distribution with respect to the wavelength of white light was calculated. That is, as shown in FIG. 11, on the line connecting the chromaticity coordinates of the light emitted from the green light emitting part (short wavelength light) and the chromaticity coordinates of the light emitted from the red light emitting part (long wavelength light).
- a calculation was performed to adjust the intensity of light emitted from the green light emitting part and the red light emitting part.
- FIG. 11 is a chromaticity diagram for explaining the method of synthesizing white light in Examples 1 to 4. The plots at both ends of each line segment are emitted from the green light emitting part and the red light emitting part in each Example. Represents the chromaticity coordinates of the light.
- the total luminous flux of white light was 1.21m per blue LED.
- a red light emitting part was produced in the same manner as in Example 1 except for the adjustment.
- the emission intensity distribution with respect to the wavelength was calculated.
- the spectral ratio of the light from the green light emitting portion and the light from the red light emitting portion power was set to 0.50: 0.50.
- Figure 13 shows the distribution obtained as a result of the calculation.
- the total luminous flux of white light was 1.31 m per blue LED.
- a green light emitting part was produced in the same manner as in Example 1 except that the mixing ratio of the light emitting material and the binder was adjusted.
- a red light emitting part was produced in the same manner as in Example 1 except for the adjustment.
- the total luminous flux of white light was 1.31 m per blue LED.
- a red light emitting part was produced in the same manner as in Example 1 except for the adjustment.
- the total luminous flux of white light was 1.31 m per blue LED.
- Ca Ce Sc Si O is used as a luminescent material that emits green light.
- FIG. 16 shows a chromaticity diagram for explaining the method of synthesizing white light in Examples 5 to 7.
- the plots at both ends of each line segment represent the chromaticity coordinates of the light emitted from the green light emitting part and the red light emitting part in each example.
- Figure 17 shows the distribution obtained as a result of the calculation.
- the total luminous flux of white light was 1. Olm per blue LED.
- a red light emitting part was produced in the same manner as in Example 1 except for the adjustment.
- the total luminous flux of white light was 1. Olm per blue LED.
- the total luminous flux of white light was 1. Olm per blue LED.
- Ca Sr Eu AlSiN is used as the luminescent material of the red light emitting part, and blue
- FIG. 20 shows a chromaticity diagram for explaining the synthesis method of white light in Example 8 to L 1.
- the plots at both ends of each line segment represent the chromaticity coordinates of light emitted from the green light emitting portion and the red light emitting portion in each example.
- Figure 21 shows the distribution obtained as a result of the calculation.
- the total luminous flux of white light was 1.31 m per blue LED.
- the total luminous flux of white light was 1.31 m per blue LED.
- a red light emitting part was produced in the same manner as in Example 8 except for the adjustment.
- the total luminous flux of white light was 1.41m per blue LED.
- a red light emitting part was produced in the same manner as in Example 8 except for the adjustment.
- the total luminous flux of white light was 1.41m per blue LED.
- Ca Sr Eu AlSiN is used as the luminescent material of the red light emitting part, and blue
- FIG. 25 shows a chromaticity diagram for explaining the method of synthesizing white light in Examples 12-14.
- the plots at both ends of each line segment represent the chromaticity coordinates of the light emitted from the green light emitting portion and the red light emitting portion in each example.
- Figure 26 shows the distribution obtained as a result of the calculation.
- the total luminous flux of white light was 1.11m per blue LED.
- a red light emitting part was produced in the same manner as in Example 12 except for the adjustment.
- the total luminous flux of white light was 1.11m per blue LED.
- a red light emitting part was produced in the same manner as in Example 12 except for the adjustment.
- the total luminous flux of white light was 1.11m per blue LED.
- the present invention can be used in any field where light is used.
- various types of mobile phones, household appliances, outdoor installation displays, liquid crystal displays, liquid crystal projectors, etc. It is suitable for use in image display devices for electronic devices, internal lighting signs, and the like.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US11/631,388 US7737623B2 (en) | 2004-06-30 | 2005-06-29 | Light emitting device, lighting system, backlight unit for display device, and display device |
EP05765409.7A EP1780592A4 (en) | 2004-06-30 | 2005-06-29 | LIGHT-EMITTING COMPONENT, BACKLIGHT UNIT, DISPLAY UNIT AND DISPLAY UNIT |
US12/775,020 US8030840B2 (en) | 2004-06-30 | 2010-05-06 | Light emitting device, lighting system, backlight unit for display device and display device |
US13/210,008 US20110298387A1 (en) | 2004-06-30 | 2011-08-15 | Light emitting device, lighting system, backlight unit for display device and display device |
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JP2004-194154 | 2004-06-30 | ||
JP2004194154 | 2004-06-30 | ||
JP2004-303363 | 2004-10-18 | ||
JP2004303363 | 2004-10-18 |
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US11/631,388 A-371-Of-International US7737623B2 (en) | 2004-06-30 | 2005-06-29 | Light emitting device, lighting system, backlight unit for display device, and display device |
US12/775,020 Continuation US8030840B2 (en) | 2004-06-30 | 2010-05-06 | Light emitting device, lighting system, backlight unit for display device and display device |
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WO2006003931A1 true WO2006003931A1 (ja) | 2006-01-12 |
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PCT/JP2005/011940 WO2006003931A1 (ja) | 2004-06-30 | 2005-06-29 | 発光装置、照明、表示装置用バックライトユニット及び表示装置 |
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US (3) | US7737623B2 (ja) |
EP (1) | EP1780592A4 (ja) |
JP (3) | JP2011097110A (ja) |
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Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09297560A (ja) * | 1996-05-07 | 1997-11-18 | Kouha:Kk | 発光表示装置 |
JP2003017751A (ja) * | 2001-06-28 | 2003-01-17 | Toyoda Gosei Co Ltd | 発光ダイオード |
JP2004048040A (ja) * | 2003-08-26 | 2004-02-12 | Toshiba Electronic Engineering Corp | 半導体発光装置 |
JP2004088003A (ja) * | 2002-08-29 | 2004-03-18 | Citizen Electronics Co Ltd | 発光ダイオードおよびその製造方法 |
JP2004241138A (ja) * | 2003-02-03 | 2004-08-26 | Koito Mfg Co Ltd | 車両用前照灯及び発光モジュール |
Family Cites Families (34)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
TW353678B (en) * | 1994-08-17 | 1999-03-01 | Mitsubishi Chem Corp | Aluminate phosphor |
US20040239243A1 (en) * | 1996-06-13 | 2004-12-02 | Roberts John K. | Light emitting assembly |
JP3094961B2 (ja) * | 1997-07-31 | 2000-10-03 | 日本電気株式会社 | 液晶表示素子 |
US6340824B1 (en) * | 1997-09-01 | 2002-01-22 | Kabushiki Kaisha Toshiba | Semiconductor light emitting device including a fluorescent material |
US6252254B1 (en) * | 1998-02-06 | 2001-06-26 | General Electric Company | Light emitting device with phosphor composition |
US6095661A (en) * | 1998-03-19 | 2000-08-01 | Ppt Vision, Inc. | Method and apparatus for an L.E.D. flashlight |
JP3486345B2 (ja) * | 1998-07-14 | 2004-01-13 | 東芝電子エンジニアリング株式会社 | 半導体発光装置 |
US6373188B1 (en) * | 1998-12-22 | 2002-04-16 | Honeywell International Inc. | Efficient solid-state light emitting device with excited phosphors for producing a visible light output |
JP2001184921A (ja) | 1999-12-28 | 2001-07-06 | Toshiba Corp | 発光装置 |
AU2001283367A1 (en) * | 2000-08-15 | 2002-02-25 | Emagin Corporation | Organic light emitting diode display devices having barrier structures between sub-pixels |
JP2002134284A (ja) * | 2000-10-27 | 2002-05-10 | Stanley Electric Co Ltd | 白色発光ダイオ−ドの駆動装置 |
JP4932078B2 (ja) * | 2000-12-04 | 2012-05-16 | 日亜化学工業株式会社 | 発光装置及びその製造方法 |
JP3942371B2 (ja) * | 2001-03-26 | 2007-07-11 | 三洋電機株式会社 | 白色表示器 |
CN1462304A (zh) * | 2001-04-27 | 2003-12-17 | 化成光学仪器株式会社 | 荧光体及其制造方法 |
US7001537B2 (en) * | 2001-04-27 | 2006-02-21 | Kasei Optonix, Ltd. | Phosphor and its production process |
JP2003017263A (ja) * | 2001-07-05 | 2003-01-17 | Idemitsu Kosan Co Ltd | El表示装置、その製造方法、カラーフィルタ及びその製造方法 |
DE10133352A1 (de) * | 2001-07-16 | 2003-02-06 | Patent Treuhand Ges Fuer Elektrische Gluehlampen Mbh | Beleuchtungseinheit mit mindestens einer LED als Lichtquelle |
US7189340B2 (en) * | 2004-02-12 | 2007-03-13 | Mitsubishi Chemical Corporation | Phosphor, light emitting device using phosphor, and display and lighting system using light emitting device |
JP4032682B2 (ja) | 2001-08-28 | 2008-01-16 | 三菱化学株式会社 | 蛍光体 |
JP2003133595A (ja) | 2001-10-24 | 2003-05-09 | Seiwa Electric Mfg Co Ltd | 発光ダイオードランプ、これに用いられる赤色蛍光体及びこれに用いられるフィルタ |
JPWO2003058726A1 (ja) * | 2001-12-28 | 2005-05-19 | サンケン電気株式会社 | 半導体発光素子、発光表示体、半導体発光素子の製造方法及び発光表示体の製造方法 |
DE60332676D1 (de) * | 2002-02-15 | 2010-07-01 | Mitsubishi Chem Corp | Lichtemittierendes Element und zughörige Beleuchtungsvorrichtung |
JP4280038B2 (ja) | 2002-08-05 | 2009-06-17 | 日亜化学工業株式会社 | 発光装置 |
JP2004062772A (ja) | 2002-07-31 | 2004-02-26 | Toppan Printing Co Ltd | カード有効化サーバ装置およびカード有効化方法 |
TW200426728A (en) * | 2002-08-30 | 2004-12-01 | Mitsubishi Chem Corp | Color liquid crystal display component |
JP3782411B2 (ja) * | 2002-09-02 | 2006-06-07 | 松下電器産業株式会社 | 発光装置 |
JP4239545B2 (ja) | 2002-10-03 | 2009-03-18 | 日亜化学工業株式会社 | 半導体装置の製造方法 |
JP2005101296A (ja) * | 2003-09-25 | 2005-04-14 | Osram-Melco Ltd | 可変色発光ダイオード素子及び可変色発光ダイオードモジュール及び可変色発光ダイオード照明器具 |
JP3837588B2 (ja) | 2003-11-26 | 2006-10-25 | 独立行政法人物質・材料研究機構 | 蛍光体と蛍光体を用いた発光器具 |
JP2005167138A (ja) * | 2003-12-05 | 2005-06-23 | Nec Lighting Ltd | 白色発光素子 |
JP2005243699A (ja) | 2004-02-24 | 2005-09-08 | Mitsubishi Chemicals Corp | 発光素子、及び画像表示装置、並びに照明装置 |
JP4511849B2 (ja) * | 2004-02-27 | 2010-07-28 | Dowaエレクトロニクス株式会社 | 蛍光体およびその製造方法、光源、並びにled |
JP2006019409A (ja) | 2004-06-30 | 2006-01-19 | Mitsubishi Chemicals Corp | 発光装置並びにそれを用いた照明、ディスプレイ用バックライト及びディスプレイ |
JP5226929B2 (ja) | 2004-06-30 | 2013-07-03 | 三菱化学株式会社 | 発光素子並びにそれを用いた照明装置、画像表示装置 |
-
2005
- 2005-06-29 EP EP05765409.7A patent/EP1780592A4/en not_active Withdrawn
- 2005-06-29 WO PCT/JP2005/011940 patent/WO2006003931A1/ja active Application Filing
- 2005-06-29 US US11/631,388 patent/US7737623B2/en not_active Expired - Fee Related
- 2005-06-30 TW TW094122054A patent/TW200624949A/zh unknown
-
2010
- 2010-05-06 US US12/775,020 patent/US8030840B2/en not_active Expired - Fee Related
-
2011
- 2011-02-14 JP JP2011028456A patent/JP2011097110A/ja active Pending
- 2011-02-14 JP JP2011028455A patent/JP2011146723A/ja active Pending
- 2011-08-15 US US13/210,008 patent/US20110298387A1/en not_active Abandoned
-
2013
- 2013-02-13 JP JP2013025709A patent/JP2013141001A/ja active Pending
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09297560A (ja) * | 1996-05-07 | 1997-11-18 | Kouha:Kk | 発光表示装置 |
JP2003017751A (ja) * | 2001-06-28 | 2003-01-17 | Toyoda Gosei Co Ltd | 発光ダイオード |
JP2004088003A (ja) * | 2002-08-29 | 2004-03-18 | Citizen Electronics Co Ltd | 発光ダイオードおよびその製造方法 |
JP2004241138A (ja) * | 2003-02-03 | 2004-08-26 | Koito Mfg Co Ltd | 車両用前照灯及び発光モジュール |
JP2004048040A (ja) * | 2003-08-26 | 2004-02-12 | Toshiba Electronic Engineering Corp | 半導体発光装置 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1780592A4 * |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7474050B2 (en) | 2004-06-30 | 2009-01-06 | Mitsubishi Chemical Corporation | Light emitting device, and lighting system, backlight for display and display using the same |
US8427044B2 (en) | 2004-06-30 | 2013-04-23 | Mitsubishi Chemical Corporation | Light emitting device, and lighting system, image display using the same |
US8884514B2 (en) | 2004-06-30 | 2014-11-11 | Mitsubishi Chemical Corporation | Phosphor composition, light-emitting device having the same, cured product having the same, lighting system having the same, and display having the same |
WO2008045927A2 (en) * | 2006-10-12 | 2008-04-17 | Cree Led Lighting Solutions, Inc. | Lighting device and method of making same |
WO2008045927A3 (en) * | 2006-10-12 | 2008-06-05 | Led Lighting Fixtures Inc | Lighting device and method of making same |
US8994045B2 (en) | 2006-10-12 | 2015-03-31 | Cree, Inc. | Lighting device having luminescent material between a reflective cup and a solid state light emitter |
US9006761B2 (en) * | 2008-08-25 | 2015-04-14 | Citizen Electronics Co., Ltd. | Light-emitting device |
Also Published As
Publication number | Publication date |
---|---|
US20100213861A1 (en) | 2010-08-26 |
US7737623B2 (en) | 2010-06-15 |
TW200624949A (en) | 2006-07-16 |
JP2011097110A (ja) | 2011-05-12 |
JP2011146723A (ja) | 2011-07-28 |
JP2013141001A (ja) | 2013-07-18 |
US8030840B2 (en) | 2011-10-04 |
US20080303410A1 (en) | 2008-12-11 |
EP1780592A4 (en) | 2014-07-09 |
EP1780592A1 (en) | 2007-05-02 |
US20110298387A1 (en) | 2011-12-08 |
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