WO2015174322A1 - Dispositif électroluminescent et appareil d'affichage - Google Patents

Dispositif électroluminescent et appareil d'affichage Download PDF

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Publication number
WO2015174322A1
WO2015174322A1 PCT/JP2015/063214 JP2015063214W WO2015174322A1 WO 2015174322 A1 WO2015174322 A1 WO 2015174322A1 JP 2015063214 W JP2015063214 W JP 2015063214W WO 2015174322 A1 WO2015174322 A1 WO 2015174322A1
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light
light emitting
emitting device
emitting element
cavity
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PCT/JP2015/063214
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English (en)
Japanese (ja)
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小野崎　学
憲晃 藤井
裕史 北村
隅谷　憲
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シャープ株式会社
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Publication of WO2015174322A1 publication Critical patent/WO2015174322A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers 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 having potential barriers 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

Definitions

  • the present invention relates to a light emitting device and a display device that affect biological rhythm.
  • FIG. 7 presents a melatonin inhibitory action spectrum.
  • FIG. 7 shows that light in a wide wavelength range having a peak wavelength of about 465 nm suppresses the secretion of melatonin, and elucidates the relationship between the secretion of melatonin and biological rhythms such as sleep-wakefulness and body temperature fluctuations. It is being done.
  • FIG. 8 shows a known action spectrum of a human retina photoreceptor.
  • a photoreceptor called endogenous photosensitive retinal fine (ipRGC) has also been found in the retina, and the photoresponse characteristics shown in FIG. It is shown.
  • ipRGC endogenous photosensitive retinal fine
  • the physiological spectrum of light is important for the light spectrum that organisms receive.
  • artificial light has the same effect as natural light.
  • the organism is disturbed by an accurate 24-hour diurnal rhythm.
  • adverse effects on various living bodies such as sleep disorders are regarded as problems. For this reason, techniques for solving this problem have been proposed.
  • Patent Document 1 a first illuminant having a peak wavelength at 600 nm to 660 nm (red), a second illuminant having a peak wavelength at 530 nm to 570 nm (green), and a peak wavelength at 420 nm to 470 nm are disclosed.
  • the first and second light emitters are provided with a color conversion member and a short wavelength cut filter for reducing the visible light component having a wavelength of 480 nm or less to almost zero
  • a technique for emitting a visible light component having a wavelength of 480 nm or less from a light emitter is disclosed.
  • Patent Document 2 discloses a first light emitting unit that emits a daylight color having a high color temperature of 6000 K or more with a light emitting diode chip and a fluorescent material, and a second that emits warm white with a color temperature of 3000 K or less with a light emitting diode chip and a fluorescent material.
  • a technology is disclosed in which the light emitting diode chip emits blue light or UV (Ultra Violet) light.
  • Patent Document 3 a first semiconductor light emitting device having a peak wavelength in a wavelength range of 430 nm to 490 nm, a first LED (Light Emitting Diode) that emits white light by a first wavelength conversion member, and 360 nm
  • the second semiconductor light emitting device having a peak wavelength in the wavelength range of ⁇ 420 nm and the second LED that emits white light by the second wavelength conversion member, and matching the color temperature of the white light emitted by each of the first and second LEDs Techniques for making them disclosed are disclosed.
  • the display unit is divided into a user work area and a non-work area, and in the non-work area, the secretion of melatonin is suppressed by increasing the intensity of blue light in the awakening period, and in the sedation period.
  • Patent Document 5 a first illuminant (blue) having an emission peak wavelength at 445 nm to 480 nm and a second illuminant (blue) having an emission peak wavelength on a shorter wavelength side than the first emitter are selectively used.
  • a technique for lighting is disclosed.
  • Patent No. 538249 Publication (issued on January 8, 2014)” Japanese Patent Gazette “Patent No. 5430394 (issued February 26, 2014)” Japanese Patent Publication “JP 2012-64860 A (published March 29, 2012)” Japanese Patent Gazette “Patent No. 4692528 (issued on June 1, 2011)” Japanese Patent Publication “Japanese Patent Laid-Open No. 2005-63687 (published on March 10, 2005)”
  • Patent Document 1 The technique disclosed in Patent Document 1 is mainly intended to maintain color rendering properties, and a blue light component having a peak wavelength in the vicinity of 450 nm to 480 nm remains.
  • Patent Document 1 does not mention a method for significantly reducing the melatonin suppression effect in the entire light source device.
  • a light source device that increases the amount of effective melatonin-suppressed radiation required mainly during early morning or daytime awakenings and a melatonin-suppressed effective radiation that is mainly required during nighttime sleeping. It is important to switch to a light source device whose amount is almost zero.
  • Patent Document 1 does not mention a means for realizing this switching.
  • Patent Documents 2 and 3 disclose a technique for switching between two types of light emitting units in accordance with a human circadian rhythm (according to awakening in the daytime or sleeping at night). It is desirable that the effective radiation dose for suppressing melatonin is as small as possible at bedtime at night, but the blue light component having a peak wavelength in the vicinity of 450 nm to 480 nm remains. It is difficult to reduce significantly.
  • Patent Document 4 discloses an example of use in an image display device, but since the blue light component remains even in the sedation period, it is difficult to significantly reduce the melatonin suppression effect.
  • Patent Document 5 while focusing on making the light from the first illuminant have a melatonin suppressing effect, the light from the second illuminant has almost no melatonin suppressing effect. Is not focused. Therefore, the light from the second light emitter still has a somewhat large melatonin suppression effect, and it is difficult to significantly reduce the melatonin suppression effect in the entire light source device.
  • the present invention has been made in view of the above-described problems, and an object thereof is to provide a light-emitting device and a display device that can greatly reduce the melatonin suppressing effect.
  • a light-emitting device includes at least one first semiconductor light-emitting element that emits light having a light emission intensity peak in a first wavelength range of 390 nm to 420 nm, Excited by light emitted from the first semiconductor light emitting element and at least one second semiconductor light emitting element that emits light having an emission intensity peak in a second wavelength region that is greater than 420 nm and less than or equal to 480 nm, and is 498 nm or more and 830 nm or less.
  • the emission intensity peaks in the third wavelength region Excited by the light emitted from the first light conversion member that generates fluorescence having one or more emission intensity peaks in a certain third wavelength region, and the second semiconductor light emitting element, the emission intensity peaks in the third wavelength region.
  • the melatonin suppressing effect can be greatly reduced.
  • blue LED second semiconductor light-emitting element
  • phosphor group second light conversion member
  • the purple LED emits light having a peak of emission intensity in the range of 390 nm to 420 nm (first wavelength region).
  • the blue LED emits light having a peak of emission intensity in the range from 420 nm to 480 nm or less (second wavelength range).
  • each excited phosphor group generates fluorescence having one or more emission intensity peaks in the range of 498 nm to 830 nm (third wavelength region).
  • the purple LED and the blue LED are driven independently from each other (that is, provided with a drive unit).
  • FIG. 1 is a cross-sectional view showing the configuration of the first embodiment of the LED package.
  • LED package 13 includes LED chips 14 and 15, resins 16 and 17, phosphor groups 18 and 19, and cavities 20 and 21.
  • the LED chip (first semiconductor light emitting element) 14 emits purple light having a peak of emission intensity in a range of 390 nm to 420 nm (first wavelength region). The purple light has almost no melatonin inhibitory action.
  • the LED chip 14 is stored in the cavity 20 and is sealed with a resin 16 including a phosphor group 18.
  • the LED chip (second semiconductor light emitting element) 15 emits blue light having a peak of light emission intensity in the range of 420 nm to 480 nm (second wavelength region).
  • the blue light has a large melatonin suppressing effect.
  • the LED chip 15 is stored in the cavity 21 and is sealed with a resin 17 including a phosphor group 19.
  • Resin (sealing member) 16 includes a phosphor group 18 and seals the LED chip 14 stored in the cavity 20.
  • Resin (sealing member) 17 includes the phosphor group 19 and seals the LED chip 15 stored in the cavity 21.
  • the phosphor group (first light conversion member) 18 is excited by purple light emitted from the LED chip 14 and generates fluorescence having one or more emission intensity peaks at 498 nm or more and 830 nm or less (third wavelength region). And consists of a plurality of phosphors 18s. Although illustration of the phosphor group 18 in FIG. 1 is omitted for the sake of brevity, a group composed of a plurality of phosphors 18 s contained in the resin 16 is referred to as a phosphor group 18.
  • the phosphor group 18 is included in the resin 16.
  • Each of the phosphors 18s constituting the phosphor group 18 may generate the same color fluorescence, or at least one of the phosphors 18s may generate fluorescence of a color different from that of the other phosphors 18s. There may be.
  • all of the phosphors 18s constituting the phosphor group 18 may be phosphors 18s that produce yellow fluorescence, or the phosphor group 18 and the phosphors 18s that produce red fluorescence may be green. You may consist of the combination with fluorescent substance 18s which produces
  • the phosphor group (second light conversion member) 19 is excited by blue light emitted from the LED chip 15 and generates fluorescence having one or more emission intensity peaks at 498 nm or more and 830 nm or less. It consists of a body 19s. Although the illustration of the phosphor group 19 in FIG. 1 is omitted for the sake of brevity, a group composed of a plurality of phosphors 19 s contained in the resin 17 is referred to as a phosphor group 19.
  • the phosphor group 19 is included in the resin 17.
  • Each of the phosphors 19s constituting the phosphor group 19 may generate the same color of fluorescence, or at least one of the phosphors 19s may generate a fluorescence of a color different from that of the other phosphors 19s. There may be.
  • all of the phosphors 19s constituting the phosphor group 19 may be phosphors 19s that generate yellow fluorescence, or the phosphor group 19 and the phosphors 19s that generate red fluorescence may be green. It may consist of a combination with a phosphor 19s that generates fluorescence.
  • the phosphor group 18 and the phosphor group 19 may include the same type of phosphor, or may be composed of different materials (for example, each phosphor) or a blending ratio of the materials.
  • the cavity (first cavity) 20 is a recess (such as a container) that stores the LED chip 14.
  • the cavity 20 is filled with the resin 16 including the phosphor group 18.
  • the cavity (second cavity) 21 is a recess (such as a container) that stores the LED chip 15.
  • the cavity 21 is filled with the resin 17 including the phosphor group 19.
  • the LED package 13 white light is realized by a combination of the LED chip 14 and the phosphor group 18. Independent of driving the LED chip 14, the LED package 13 includes an LED chip 15. About the fluorescent substance group 19, it is omissible suitably as needed.
  • one LED chip 14 is mounted in the cavity 20, but a plurality of LED chips 14 may be mounted in the cavity 20.
  • one LED chip 15 is mounted in the cavity 21, but a plurality of LED chips 15 may be mounted in the cavity 21.
  • the number of the LED chips 14 mounted in the cavity 20 and the number of the LED chips 15 mounted in the cavity 21 may be different from each other. Thereby, according to desired brightness, the brightness of light obtained from the purple light emitted from each LED chip 14 and the brightness of light obtained from the blue light emitted from each LED chip 15 can be arbitrarily set. Can be set to
  • a light diffusion member (not shown) for diffusing light may be provided in the path of light emitted from the cavity 20 and / or the path of light emitted from the cavity 21.
  • the light diffusing member include a lens mounted in the opening of the cavity 20 and / or the opening of the cavity 21, and a diffusing agent contained in the resin 16 and / or the resin 17. This facilitates color mixing between the light emitted from the cavity 20 and the light emitted from the cavity 21.
  • cavity 20 and the cavity 21 may be separated as separate packages and configured as two packages.
  • the depression is used for storing the LED chip
  • it is not necessarily limited to such a form.
  • a form in which an LED chip is mounted on a substrate having a lead frame and potted with a sealing resin is possible.
  • FIG. 2 is a cross-sectional view showing the configuration of the LED package according to the second embodiment.
  • the LED package 23 shown in FIG. 2 includes LED chips 14 and 15, a resin 26, a phosphor group 28, and a cavity 30.
  • the LED chips 14 and 15 are housed in the cavity 30 and sealed with a resin 26 including a phosphor group 28.
  • Resin (sealing member) 26 includes phosphor group 28 and seals LED chips 14 and 15 stored in cavity 30.
  • the phosphor group (light converting member) 28 is excited by the purple light emitted from the LED chip 14 and generates fluorescence having one or more emission intensity peaks at 498 nm or more and 830 nm or less. Consists of. Further, the phosphor group 28 may be excited by blue light emitted from the LED chip 15 to generate fluorescence having one or more emission intensity peaks in the range from 498 nm to 830 nm. Although illustration of the phosphor group 28 in FIG. 2 is omitted for the sake of brevity, a group composed of a plurality of phosphors 28 s contained in the resin 26 is referred to as a phosphor group 28.
  • the phosphor group 28 is included in the resin 26.
  • Each of the phosphors 28s constituting the phosphor group 28 may generate the same color of fluorescence, or at least one of the phosphors 28s may generate fluorescence of a color different from that of the other phosphors 28s. There may be.
  • all of the phosphors 28s constituting the phosphor group 28 may be phosphors 28s that produce yellow fluorescence, or the phosphor group 28 and the phosphors 28s that produce red fluorescence may be green. You may consist of the combination with the fluorescent substance 28s which produces fluorescence.
  • the cavity 30 is a recess (such as a container) that stores the LED chips 14 and 15.
  • the cavity 30 is filled with a resin 26 including a phosphor group 28.
  • FIG. 3 is a circuit block diagram showing a schematic configuration of the light emitting device according to the present embodiment.
  • the light emitting device 1 shown in FIG. 3 includes a dimming control unit 2, constant current circuits 3 and 4, and LED circuits 5 and 6.
  • the dimming control unit 2 is connected to the constant current circuits 3 and 4.
  • the constant current circuit 3 is connected to the LED circuit 5.
  • the constant current circuit 4 is connected to the LED circuit 6.
  • LED circuits 5 and 6 are a series circuit of a plurality of LED packages 13 mounted on a substrate.
  • the LED circuit 5 has a plurality of LED chips 14 connected in series
  • the LED circuit 6 has a plurality of LED chips 15 connected in series.
  • each LED circuit 5 and 6 have different emission spectra. That is, the emission spectrum of each LED chip 14 of the LED circuit 5 has a peak of emission intensity in the first wavelength range of 390 nm to 420 nm.
  • the light emission spectrum of each LED chip 15 of the LED circuit 6 has a peak of light emission intensity in the second wavelength region that exceeds 420 nm and is 480 nm or less. Accordingly, the violet light emitted from each LED chip 14 and the blue light emitted from each LED chip 15 have different amounts of action on the intrinsic light-sensitive retinal fine. For this reason, the purple light and the blue light have different effects on the biological rhythm.
  • the amount of action is the amount of reaction that reacts when the photoreceptor receives light. It is obtained by integrating the action spectrum with the spectrum of the irradiation light and integrating it with the wavelength.
  • the dimming control unit (drive unit) 2 controls the lighting time of the LED chip 14 of the LED circuit 5 and the LED chip 15 of the LED circuit 6 by PWM (Pulse Width Modulation: pulse width modulation).
  • the dimming control unit 2 individually controls the LED circuit 5 (LED chip 14) and the LED circuit 6 (LED chip 15).
  • the dimming controller 2 has a PWM circuit (not shown) that individually generates a PWM signal to be supplied to each of the LED circuits 5 and 6. This PWM circuit changes the duty ratio of each PWM signal in accordance with, for example, an instruction from the outside of the illumination control unit 7 or the light emitting device 1.
  • the constant current circuit (drive unit) 3 generates a constant current based on the PWM signal supplied from the dimming control unit 2 and supplies the constant current to the LED circuit 5.
  • the constant current circuit 3 supplies the constant current to the LED circuit 5 by being turned on during the high level period of the PWM signal, while the constant current circuit 3 is turned off during the low level period of the PWM signal. No current is supplied to the LED circuit 5.
  • the constant current circuit (drive unit) 4 generates a constant current based on the PWM signal supplied from the dimming control unit 2 and supplies the constant current to the LED circuit 6.
  • the constant current circuit 4 supplies the constant current to the LED circuit 6 by being turned on during the high level period of the PWM signal, while being turned off during the low level period of the PWM signal. No current is supplied to the LED circuit 6.
  • the constant current circuit 3 controls the constant current supplied to the LED circuit 5 by the PWM signal generated individually by the dimming control unit 2 for each of the LED circuits 5 and 6, and the constant current circuit 4
  • the constant current supplied to the LED circuit 6 is controlled.
  • the LED chip 14 and the LED chip 15 are individually controlled. Therefore, the light emitting device 1 emits light of mixed colors having different colors according to the light intensity of the LED chip 14 and the LED chip 15 by adjusting the constant current supplied to the LED circuits 5 and 6. Can do.
  • control of the LED circuits 5 and 6 by the dimming control unit 2 includes changing the light emission luminance, turning on and off, and blinking of the LED chips 14 and 15.
  • the LED package 23 may be used instead of the LED package 13.
  • the illumination control unit 7 includes necessary components according to the use conditions of the light emitting device 1 and controls the LED circuits 5 and 6 by sending instructions to the dimming control unit 2.
  • Purple light having a peak of emission intensity in the wavelength range of 390 nm or more and 420 nm or less has a smaller amount of visual effect than blue light having a peak of emission intensity in the wavelength range of more than 420 nm and less than or equal to 480 nm. . That is, when these lights are emitted with the same intensity, the purple light appears darker than the blue light. These lights look different from each other in the brightness of the blue, so the colors are different from each other, but because human vision has a function of chromatic adaptation, eventually they become used to the difference in the colors and both of these lights are natural. Become visible.
  • the light emitting device 1 is suitable as a light source for display devices such as portable devices and television receivers.
  • a liquid crystal display is mainly used as the display device.
  • Most liquid crystal displays realize multi-coloring by combining color filters and liquid crystals.
  • the liquid crystal has a low transmittance for a component on the short wavelength side of visible light.
  • the color filters blue ones are usually selected that are optimal for blue wavelengths having a peak in the vicinity of 450 to 460 nm, and many have low transmittance at 420 nm.
  • the light emitting device 1 when the light emitting device 1 is applied to a liquid crystal display, it is necessary to make adjustments so that the light emission intensity of light having many components on the short wavelength side is increased.
  • a digital micromirror device that uses reflection instead of transmission does not require a color filter or liquid crystal, so that the attenuation of the short wavelength component is small. Therefore, it can be said that it is more suitable for application of the light emitting device 1.
  • FIG. 10 is a circuit block diagram showing a schematic configuration of the light emitting device according to the present embodiment. Those not specifically described have the same functions as those shown in FIG.
  • the light emitting device 101 shown in FIG. 10 is included in the concept of the light emitting device 1 shown in FIG. However, in order to clearly indicate that the light emitting device 101 includes the timer unit 105, in FIG. 10, the light source control unit (control unit) 104 and the timer unit 105 are clearly shown in the block of the illumination control unit 7. Yes.
  • the timer unit 105 is a functional block that detects at least one of time and lapse of time by some configuration.
  • the timer unit 105 can be realized by the configurations exemplified in the following (A) to (C).
  • a configuration that directly obtains time and / or time passage such as a real-time clock (RTC) device, a radio clock receiver module, or a GPS (Global Positioning System) receiver module.
  • RTC real-time clock
  • radio clock receiver module such as a radio clock receiver module, or a GPS (Global Positioning System) receiver module.
  • GPS Global Positioning System
  • (B) A configuration (function unit) that connects to a network or the like and obtains time from other connection nodes.
  • (C) A configuration (method) for obtaining the time and / or the passage of time by counting the passage of time with a CPU (Central Processing Unit).
  • CPU Central Processing Unit
  • the light source control unit 104 receives information indicating at least one of the time and the passage of time from the timer unit 105, and appropriately controls the constant current circuits 3 and 4 by the dimming control unit 2 in accordance with this information, and the LED circuit 5
  • the lighting time of each LED chip 14 and each LED chip 15 of the LED circuit 6 is controlled.
  • the lighting time is controlled so that the light emission intensity by each LED chip 15 mainly increases during the day, and the light emission intensity by each LED chip 15 gradually decreases and the light emission intensity by each LED chip 14 increases by night. It is possible to control the lighting time so that
  • the display color changes depending on the lighting time of each LED chip 14 and each LED chip 15.
  • human vision has a function of chromatic adaptation, and even if the displayed hue is different from the original hue, the chromatic adaptation function can identify colors without feeling unnatural. is there. Therefore, there is no problem in using the light emitting device 101 as the light source of the display device.
  • the light emitting device 101 can adjust the above time profile to sunlight according to the time and place. That is, it is possible to change the color and intensity of light emission in accordance with the actual sunshine duration.
  • FIG. 11 is a circuit block diagram showing a schematic configuration of the light emitting device according to the present embodiment. Those not specifically described have the same functions as those shown in FIG.
  • the light emitting device 102 shown in FIG. 11 is included in the concept of the light emitting device 1 shown in FIG. However, in order to clearly indicate that the light emitting device 102 includes the timer unit 105 and the communication unit 106, in FIG. 11, the light source control unit 104, the timer unit 105, and the communication unit 106 are included in the block of the illumination control unit 7. Each is clearly indicated. A difference between the light emitting device 102 illustrated in FIG. 11 and the light emitting device 101 illustrated in FIG. 10 is the presence or absence of the communication unit 106.
  • the application example in which the color of the display on the display device is different from the original one using the human visual color adaptation function has been described.
  • the chromatic adaptation is also affected by the ambient light of the display device. It becomes.
  • the communication unit 106 is a communication function block for controlling ambient light around a display device outside the light emitting device 102.
  • Communication means include wireless communication such as infrared remote control and Bluetooth (registered trademark), lighting control interface such as Dali (Digital Addressable Lighting Interface) and DMX512 signal interface, and other general purpose or dedicated connections Means can be used.
  • the communication part 106 according to the selected said connection means is prepared.
  • the communication unit 106 outputs a signal for controlling the ambient light to the outside using this connection means, and this signal makes the hue of the ambient light close to the hue of the light emitted from the light emitting device 102. Trigger.
  • the ambient light irradiated from the lighting device or the like using the communication unit 106 is also changed in accordance with the change in the emission spectrum of the light emitted from the LED chips 14 and 15. Can be made.
  • the image of the display device and the ambient light are incident on the user's eyes. By making these colors similar, adaptation to the color of the image of the display device is facilitated.
  • the timer unit 105 may be omitted.
  • FIG. 12 is a circuit block diagram showing a schematic configuration of the light emitting device according to the present embodiment. Those not specifically described have the same functions as those shown in FIG.
  • the light emitting device 103 shown in FIG. 12 is included in the concept of the light emitting device 1 shown in FIG. However, in order to clearly indicate that the light emitting device 103 includes the sensor unit 107, in FIG. 12, the light source control unit 104 and the sensor unit 107 are clearly shown in the block of the illumination control unit 7.
  • the sensor unit 107 is a functional block that detects how much blue component the ambient light irradiated to the surroundings contains. An example of the configuration of the sensor unit 107 will be described with reference to FIG.
  • the sensor unit 107 includes a sensor control unit 108, illuminance sensors 109a and 109b, and color filters 110a and 110b.
  • the color filters 110a and 110b have different transmission spectra.
  • the light transmitted through the color filters 110a and 110b is incident on the illuminance sensors 109a and 109b, respectively.
  • the reaction between the illuminance sensor 109a and the illuminance sensor 109b (for example, as an index indicating the intensity of the blue component) according to the intensity of the blue component (short wavelength component of visible light) included in the light such as ambient light.
  • the balance of the output value is adjusted.
  • the illuminance sensor 109a and the illuminance sensor 109b have different frequencies of light to be detected.
  • the color filter 110a transmits a long wavelength component (green or red) of visible light relatively well
  • the color filter 110b transmits a short wavelength component (blue) of visible light relatively well.
  • the intensity of the blue component of the ambient light is large, the light transmitted through the color filter 110a is small and the light transmitted through the color filter 110b is large. Accordingly, the response of the illuminance sensor 109b is greater than the response of the illuminance sensor 109a.
  • the intensity of the blue component of the ambient light is small, much light is transmitted through the color filter 110a and little light is transmitted through the color filter 110b. Accordingly, the response of the illuminance sensor 109a is greater than the response of the illuminance sensor 109b.
  • the sensor control unit 108 can read the magnitude of the response of the illuminance sensors 109a and 109b and detect the hue of the ambient light (blue component intensity) from the balance.
  • the light source control unit 104 adjusts the light emission of the light emitting device 103 according to the result (detection result of the sensor control unit) detected by the sensor control unit 108. For example, when the intensity of the blue component of the ambient light is large, the light emission of each LED chip 15 with high blue visibility is controlled to be more dominant than the light emission of each LED chip 14 with low blue visibility. It is assumed that the light emission has a high intensity of the component. Conversely, when the intensity of the blue component of the ambient light is small, the light emission intensity of each LED chip 15 is reduced and the light emission intensity of each LED chip 14 is increased. In this way, the light emitting device 103 can change the color of light emission in accordance with the color of ambient light.
  • the chromatic adaptation proceeds to lubrication and it is difficult to feel unnaturalness in the color of the display.
  • a configuration in which no color filter is used can be obtained by using a plurality of illuminance sensors having different reacting spectra. Further, instead of using two types of color filters, a structure in which a color filter is used only for one illuminance sensor and a color filter is not used for the other illuminance sensor is possible. In addition to using an illuminance sensor such as a photodiode, it is possible to detect the hue of ambient light by using a camera module.
  • FIG. 4 is a graph comparing the melatonin inhibitory action spectrum (see FIG. 7) with the emission spectrum of light obtained from the LED chip 14 and the phosphor group 18 or 28.
  • the light emission spectrum distribution graph of FIG. 4 uses a chip that emits purple light with a peak of 405 nm as the LED chip 104, and the phosphor group 18 or 28 includes ⁇ -sialon of a green phosphor and CASN of a red phosphor. The example when combining is shown.
  • the melatonin inhibitory action spectrum As shown in the melatonin inhibitory action spectrum, light having a wavelength of 430 nm to 500 nm has a melatonin inhibitory effect of 60% or more with respect to the peak value. Since the light obtained from the LED chip 14 and the phosphor group 18 or 28 has an emission spectrum that hardly includes a wavelength of 430 nm to 500 nm, the melatonin suppressing effect is very small.
  • the light obtained from the LED chip 14 and the phosphor group 18 or 28 is effective to use the light obtained from the LED chip 14 and the phosphor group 18 or 28 as the illumination before going to bed according to the biological rhythm. That is, by using light derived from blue light emitted from the LED chip 15 in the morning and using light derived from purple light emitted from the LED chip 14 at night, the light source is switched in accordance with the biological rhythm. Is possible.
  • the light emitting device 1 does not cut all light having a wavelength shorter than about 500 nm, but emits light having a light emission intensity peak at a wavelength of 390 nm to 420 nm by the LED chip 14.
  • the light emitting device 1 it becomes possible to apply the light emitting device 1 to a display device that performs display by combining colors in three primary colors, such as a backlight of a liquid crystal display device.
  • a second advantage when applied to a lighting device that illuminates a room or the like, it becomes possible to obtain whited light.
  • FIG. 5 is a graph of Smith, Pokony's cone sensitivity function, well known among color engineering researchers as the spectral sensitivity of the L, M, and S cones. This is a spectral characteristic including the optical system of the eyeball, and it is convenient to discuss the relationship between the mechanism that feels light and color when light enters the eye.
  • the light obtained from the LED chip 14 and the phosphor group 18 or 28 contains almost no light having a wavelength of 450 nm to 495 nm classified as blue light, while the violet light near the wavelength of 405 nm is dominant.
  • the purple light hardly stimulates the L cone and the M cone, and substantially stimulates the S cone. For this reason, this purple light has various colors on the human eye by changing the amount of stimulation of the L cone, M cone, and S cone, despite having almost no melatonin suppression effect. Can be used as a light source.
  • FIG. 6 is a graph showing the degree of feeling brightness (specific luminous sensitivity) with respect to the wavelength of visible light.
  • the degree of feeling the brightness of light of other wavelengths where the degree of feeling the brightness of light with a wavelength of 555 nm that humans feel the brightest in an environment of brightness that can feel color is defined as 1.
  • the ratio is shown.
  • FIG. 6 is a graph of photopic standard relative luminous sensitivity characteristics.
  • the relative visibility of violet light near 405 nm is lower than that of blue light near 450 nm.
  • the specific visibility curve is said to be a curve close to the spectral sensitivity of the L cone and the M cone due to the density of cone cells on the retina.
  • the Von Kries model is well known to explain the mechanism of this chromatic adaptation.
  • the Von Kries model will be briefly described.
  • the balance of the L, M, and S cones makes the white appearance constant even when objects are placed in an illumination environment with different spectral distributions. It is a theory that changed and things looked closer to natural colors.
  • the light emitted by the incandescent bulb has a spectrum that has a smaller intensity on the short wavelength side (purple and blue) and a higher intensity on the long wavelength side (red) than sunlight.
  • the sensitivity of the S cone increases and the sensitivity of the L cone decreases, thereby approaching the color balance seen under sunlight.
  • each of the L cone, M cone, and S cone according to the spectral distribution of the light output from the display device
  • the chromatic adaptation that determines the sensitivity works.
  • a light-emitting device includes at least one first semiconductor light-emitting element (LED chip 14) that emits light having a peak of light emission intensity in a first wavelength range of 390 nm to 420 nm, and more than 420 nm to 480 nm. Excited by light emitted from at least one second semiconductor light emitting element (LED chip 15) that emits light having a peak of emission intensity in the second wavelength range, and from 498 nm to 830 nm. The third wavelength is excited by light emitted from the first light conversion member (phosphor group 18) that generates fluorescence having one or more emission intensity peaks in the third wavelength region and the second semiconductor light emitting element, and the third wavelength.
  • LED chip 14 that emits light having a peak of light emission intensity in a first wavelength range of 390 nm to 420 nm, and more than 420 nm to 480 nm.
  • LED chip 15 that emits light having a peak of emission intensity in the second wavelength range, and from 4
  • a second light conversion member (phosphor group 19) that generates fluorescence having one or more peaks of emission intensity in the region, the first semiconductor light emitting element, and the second And it includes driving unit for driving independently of each other and the conductor light emitting element and (dimming controller 2).
  • the light obtained from the first semiconductor light emitting element and the first light conversion member has an emission spectrum that hardly includes a wavelength of 430 nm to 500 nm, and therefore has little melatonin suppression effect.
  • the light obtained from the second semiconductor light emitting element and the second light conversion member has a large melatonin suppressing effect. Then, by driving the first semiconductor light emitting element and the second semiconductor light emitting element independently of each other by the driving unit, it is possible to switch between light having almost no melatonin suppressing effect and light having a large melatonin suppressing effect.
  • the light source derived from the light emitted from the second semiconductor light emitting element is used in the morning and the light derived from the light emitted from the first semiconductor light emitting element is used at night to switch the light source according to the biological rhythm. Is possible. As a result, the melatonin suppressing effect can be greatly reduced.
  • the first light conversion member and the second light conversion member further include the same type of phosphor.
  • the number of the first semiconductor light emitting elements mounted is different from the number of the second semiconductor light emitting elements mounted.
  • the brightness of the light obtained from the light which each 1st semiconductor light-emitting device emitted, and the brightness of the light obtained from the light which each 2nd semiconductor light-emitting device emitted Can be arbitrarily set.
  • the light emitting device further includes a first cavity (cavity 20) and a second cavity (cavity 21), and the first semiconductor light emitting element is stored in the first cavity.
  • the second light-emitting element is sealed in the second cavity, and is sealed with a sealing member (resin 16) including the first light conversion member.
  • the second cavity is further filled with a sealing member (resin 17) including the second light conversion member, and the first light conversion member and the second light emitting device are filled.
  • a light conversion member consists of a mutually different raw material or the compounding ratio of a raw material.
  • the light-emitting device further includes a light diffusion member that diffuses light in at least one of a path of light emitted from the first cavity and a path of light emitted from the second cavity. It has been.
  • a light-emitting device includes at least one first semiconductor light-emitting element that emits light having an emission intensity peak in a first wavelength range of 390 nm or more and 420 nm or less, and a second that is greater than 420 nm and 480 nm or less. At least one second semiconductor light emitting element that emits light having a peak of light emission intensity in the wavelength region, and the light emission intensity in the third wavelength region that is excited by light emitted from the first semiconductor light emitting element and is not less than 498 nm and not more than 830 nm.
  • a light conversion member (phosphor group 28) that generates fluorescence having one or more peaks, a driving unit that drives the first semiconductor light emitting element and the second semiconductor light emitting element independently of each other are provided.
  • the light conversion member is further excited by light emitted from the second semiconductor light emitting element, and has a fluorescence having one or more emission intensity peaks in the third wavelength region. Produce.
  • the first semiconductor light emitting element and the second semiconductor light emitting element are housed in the same cavity (cavity 30) and include the light conversion member. It is sealed with a stop member (resin 26).
  • a light-emitting device includes a control unit (light source control unit 104) that controls a lighting time of the first semiconductor light-emitting element and the second semiconductor light-emitting element, and the first semiconductor light-emitting element
  • the light emitted from the second semiconductor light-emitting element and the light emitted from the second semiconductor light emitting element are characterized in that the amount of action on the intrinsic light-sensitive retinal fine particles is different from each other.
  • the light obtained from the first semiconductor light emitting element has an emission spectrum that hardly includes a wavelength of 430 nm to 500 nm, and therefore has little melatonin suppressing effect.
  • the light obtained from the second semiconductor light emitting device has a great melatonin suppression effect.
  • the control unit controls light emission by the first semiconductor light emitting element and light emission by the second semiconductor light emitting element by the control unit, it is possible to switch between light having almost no melatonin suppressing effect and light having a large melatonin suppressing effect.
  • the light emitting device further includes a timer unit that detects at least one of time and time, and the control unit receives the time and time from the timer unit.
  • the lighting time is controlled according to information indicating at least one of the above.
  • the lighting time of the first semiconductor light emitting element and the second semiconductor light emitting element can be controlled according to the time and the passage of time.
  • the lighting time is controlled mainly during the day so that the light emission intensity of the second semiconductor light-emitting element increases, and the light emission intensity of the second semiconductor light-emitting element gradually decreases as the night goes on.
  • the lighting time can be controlled to increase the intensity.
  • the light-emitting device further includes a plurality of illuminance sensors that detect the intensity of light around the display device on which the light-emitting device is mounted and have different frequencies to be detected, and the plurality of illuminances.
  • a sensor control unit that detects the intensity of the blue component contained in the ambient light of the display device from the detection result of the sensor, and the control unit turns on the light according to the detection result of the sensor control unit. Control the time.
  • the lighting time of the first semiconductor light emitting element and the second semiconductor light emitting element can be controlled in accordance with the result of detecting the intensity of the blue component contained in the ambient light of the display device.
  • the intensity of the blue component of the light is large, the light emission of the second semiconductor light emitting element is controlled to be dominant over the light emission of the first semiconductor light emitting element, so that the light emission of a hue with a large blue component intensity is obtained. Is possible.
  • the intensity of the blue component of light is small, it is possible to control to reduce the emission intensity of the second semiconductor light emitting element and increase the emission intensity of the first semiconductor light emitting element.
  • the light emitting device further includes a communication unit that outputs a signal for controlling light around the display device outside the light emitting device in accordance with the control of the lighting time by the control unit. Yes.
  • the ambient light of the display device can be controlled in accordance with information from the communication unit.
  • a display device includes a light-emitting device according to still another embodiment of the present invention as a light source.
  • the display device has the same effect as the light emitting device according to still another aspect of the present invention.
  • the present invention can be used for light-emitting devices and display devices that affect biological rhythms.

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  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Manufacturing & Machinery (AREA)
  • Computer Hardware Design (AREA)
  • Power Engineering (AREA)
  • Led Device Packages (AREA)

Abstract

　L'objectif de la présente invention est de réduire sensiblement les effets de suppression de la mélatonine. La présente invention est pourvue d'une puce de diode électroluminescente (DEL) (14) pour émettre de la lumière qui présente une intensité d'émission de lumière maximale entre 390 et 420 nm, d'une puce DEL (15) pour émettre de la lumière qui présente une intensité d'émission de lumière maximale au-dessus de 420 nm et jusqu'à 480 nm ou moins, d'un ensemble de corps fluorescents (18) pour générer une fluorescence qui présente une ou plusieurs intensités d'émission de lumière maximales entre 498 et 830 nm et qui est excité par la lumière que la puce DEL (14) génère, et d'un ensemble de corps fluorescents (19) pour générer une fluorescence qui présente une ou plusieurs intensités d'émission de lumière maximales entre 498 et 830 nm et qui est excité par la lumière que la puce DEL (15) génère. La puce DEL (14) et la puce DEL (15) sont mutuellement et indépendamment attaquées.
PCT/JP2015/063214 2014-05-12 2015-05-07 Dispositif électroluminescent et appareil d'affichage WO2015174322A1 (fr)

Applications Claiming Priority (4)

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JP2014099037 2014-05-12
JP2014-099037 2014-05-12
JP2015-026876 2015-02-13
JP2015026876 2015-02-13

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019535129A (ja) * 2016-09-12 2019-12-05 ルミレッズ リミテッド ライアビリティ カンパニー メラノピックスペクトル量を低減した照明システム
WO2021131376A1 (fr) * 2019-12-27 2021-07-01 ヌヴォトンテクノロジージャパン株式会社 Dispositif de rayonnement de lumière et module électroluminescent

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Publication number Priority date Publication date Assignee Title
JPH08146339A (ja) * 1994-11-16 1996-06-07 Mitsubishi Electric Corp 映像表示装置
JP2011258649A (ja) * 2010-06-07 2011-12-22 Sanken Electric Co Ltd 照明装置及び照明装置の制御方法
JP2012064860A (ja) * 2010-09-17 2012-03-29 Mitsubishi Chemicals Corp Ｌｅｄ発光装置、及びｌｅｄ発光装置を備えた照明装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH08146339A (ja) * 1994-11-16 1996-06-07 Mitsubishi Electric Corp 映像表示装置
JP2011258649A (ja) * 2010-06-07 2011-12-22 Sanken Electric Co Ltd 照明装置及び照明装置の制御方法
JP2012064860A (ja) * 2010-09-17 2012-03-29 Mitsubishi Chemicals Corp Ｌｅｄ発光装置、及びｌｅｄ発光装置を備えた照明装置

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2019535129A (ja) * 2016-09-12 2019-12-05 ルミレッズ リミテッド ライアビリティ カンパニー メラノピックスペクトル量を低減した照明システム
WO2021131376A1 (fr) * 2019-12-27 2021-07-01 ヌヴォトンテクノロジージャパン株式会社 Dispositif de rayonnement de lumière et module électroluminescent
US11629827B2 (en) 2019-12-27 2023-04-18 Nuvoton Technology Corporation Japan Illumination device and light-emitting module

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