WO2019093116A1 - Dispositif d'éclairage de zone - Google Patents

Dispositif d'éclairage de zone Download PDF

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Publication number
WO2019093116A1
WO2019093116A1 PCT/JP2018/039297 JP2018039297W WO2019093116A1 WO 2019093116 A1 WO2019093116 A1 WO 2019093116A1 JP 2018039297 W JP2018039297 W JP 2018039297W WO 2019093116 A1 WO2019093116 A1 WO 2019093116A1
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WO
WIPO (PCT)
Prior art keywords
light
liquid crystal
refractive index
guide plate
crystal film
Prior art date
Application number
PCT/JP2018/039297
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English (en)
Japanese (ja)
Inventor
慎一郎 園田
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富士フイルム株式会社
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Publication date
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Publication of WO2019093116A1 publication Critical patent/WO2019093116A1/fr

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    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B5/00—Doors, windows, or like closures for special purposes; Border constructions therefor
    • E—FIXED CONSTRUCTIONS
    • E06—DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; LADDERS
    • E06B—FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES, FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS, BLINDS, GATES
    • E06B9/00—Screening or protective devices for wall or similar openings, with or without operating or securing mechanisms; Closures of similar construction
    • E06B9/24—Screens or other constructions affording protection against light, especially against sunshine; Similar screens for privacy or appearance; Slat blinds
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S11/00—Non-electric lighting devices or systems using daylight
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements

Definitions

  • the present invention relates to, for example, a planar illumination device used as a transparent window in the daytime and as a planar illumination at night.
  • the conventional planar illumination device for example, when the light source is turned on at night, light emitted from the light source and light incident on the light guide plate from the light incident surface is emitted from the light exit surface and emits light.
  • an opaque scatterer layer is provided on the light exit surface of the light guide plate to scatter light and make it uniform. Therefore, for example, even when the light source is turned off in the daytime, the scatterer layer does not become transparent, and the planar illumination device can not be used as a transparent window.
  • Patent Documents 2 and 3 are prior art documents relevant to the present invention.
  • Patent Document 2 in order to support area active drive (local dimming), a plurality of columnar regions filled with a liquid crystal material are provided in the light guide plate, and a plurality of voltages for driving the respective liquid crystal materials are applied. And a lighting device is provided to drive each liquid crystal material independently by applying a voltage to each liquid crystal material, and delivering a desired amount of light to a desired area in the light guide plate. There is.
  • Patent Document 3 discloses a PDLC (Polymer Dispersed Liquid Crystal) having a pair of transparent substrates, a light modulation layer provided in a gap between the pair of transparent substrates, and a plurality of electrodes provided on the surface of one transparent substrate. Disclosed is a lighting device in which a light modulation element such as liquid crystal is adhered to a light guide plate, the light modulation layer exhibits transparency when voltage is applied to the electrode, and scattering property when voltage is not applied to the electrode. It is done.
  • a light modulation element such as liquid crystal
  • Patent Documents 2 and 3 a large number of electrodes are provided to control the alignment state of each liquid crystal material. Therefore, there is a problem that the structure of the lighting apparatus becomes complicated and the manufacturing cost becomes high.
  • Patent Document 3 in a planar illumination device in which light is incident from a light source to one side surface which is a light incident surface of a light guide plate, and light is guided by the light guide plate from the light incident surface to an upper surface which is a light emission surface. The light is scattered while guiding light from the light incident surface to the light emitting surface, and the electric field intensity of the light gradually attenuates as it travels from the light incident surface to another side surface that is the opposite surface, There is a problem that it is difficult to make the brightness of the light emitted from the light emitting surface of the light guide plate uniform.
  • a first object of the present invention is to provide a planar lighting device which is simple in structure and can be manufactured inexpensively.
  • a second object of the present invention is, in addition to the first object, to provide a planar illumination device capable of making the luminance of light emitted from the light emission surface of the light guide plate uniform. .
  • the present invention relates to a transparent rectangular light guide plate;
  • a light source which is disposed along the length direction of one side surface which is a light incident surface of the light guide plate, and which is disposed over the entire area in the length direction and which injects light into the light guide plate from the light incident surface;
  • a scattering mode in which light is transmitted when it has a pair of electrodes and is set to a transmission mode in which light is transmitted when a voltage is applied to the pair of electrodes, and light is scattered when a voltage is not applied to a pair of electrodes
  • the difference between the refractive index of the light guide plate and the refractive index of the low refractive index layer is 0.001 to 0.5
  • the low refractive index layer has a light incident surface opposite to the light incident surface such that the electric field strength of light is uniform over the entire propagation direction of light propagating from the light incident surface to another side surface which is an opposite surface of the light incident surface.
  • the light source when the light source is turned off and the liquid crystal film is set to the transmission mode, light incident on the liquid crystal film from the thickness direction of the liquid crystal film is transmitted through the liquid crystal film,
  • the light source is turned on and the liquid crystal film is set to the scattering mode, it is preferable that light which is incident on the light guide plate from the light source and further incident on the liquid crystal film from the light guide plate is scattered and emitted by the liquid crystal film.
  • the liquid crystal film is A pair of transparent substrates, A light scattering layer disposed between and in contact with the pair of transparent substrates; With one pair of electrodes, Each of the pair of electrodes is provided on the outer surface of the pair of transparent substrates, Preferably, light is transmitted by the light scattering layer when it is set to the transmission mode, and light is scattered by the light scattering layer when it is set to the scattering mode.
  • the pair of transparent substrates is made of plastic film or glass.
  • a liquid crystal material containing a plurality of liquid crystal particles is dispersed in a resin, When no electric field is applied to the light scattering layer, the liquid crystal material becomes randomly oriented and light is scattered by the light scattering layer, When an electric field is applied to the light scattering layer, the liquid crystal material is preferably oriented in the electric field direction, and light is preferably transmitted through the light scattering layer in the electric field direction.
  • the liquid crystal film is preferably a polymer dispersed liquid crystal film.
  • the light guide plate is preferably made of acrylic resin, and the low refractive index layer is preferably made of silicone resin.
  • the light guide plate is preferably made of glass, polycarbonate or polymer.
  • the light source is configured by arranging a plurality of LEDs, LDs or incandescent lamps, which are point light sources, in a line.
  • the light source is preferably a linear light source of a cold cathode tube, a hot cathode tube or a neon tube.
  • the pair of electrodes is made of ITO, ZnO or PEDOT.
  • copper be coated on the upper surface of the pair of electrodes.
  • the refractive index of the low refractive index layer is reduced in accordance with the direction from the light incident surface to the opposing surface, and the thickness does not change over the entire light propagation direction.
  • the liquid crystal film can be set to the transmission mode or the scattering mode according to the presence or absence of voltage application to the pair of electrodes, so the structure is simple and inexpensive. It can be manufactured. Further, by arranging the low refractive index layer between the light guide plate and the liquid crystal film, the electric field intensity of light, that is, the light power can be made uniform over the entire area in the light transport direction. The luminance of light emitted from the light emission surface can be made uniform.
  • planar illumination device of the present invention will be described in detail based on preferred embodiments shown in the attached drawings.
  • FIG. 1A and FIG. 1B are side conceptual views of the first embodiment showing the configuration of the planar illumination device of the present invention.
  • the planar lighting device 10A shown in FIGS. 1A and 1B is, for example, fitted into a window frame of a building, used as a transparent window in the daytime, and used as planar lighting in the nighttime, for example.
  • the planar illumination device 10A includes a light guide plate 12, a light source 14, a first power supply 16, a first switch 18, a liquid crystal film 20, a second power supply 22, a second switch 24, and a low power supply. And a refractive index layer 26A.
  • the light guide plate 12 is a rectangular parallelepiped transparent plate having an upper surface, a lower surface, and four side surfaces, and is an upper surface which is emitted from the light source 14 and which is incident from one side surface serving as a light incident surface. Lead to the bottom.
  • the light guide plate 12 also serves as a support for supporting the low refractive index layer 26A and the liquid crystal film 20.
  • the light guide plate 12 of the present embodiment is made of an acrylic resin (a transparent thermoplastic resin such as polymethyl methacrylate (PMMA)), but as the light guide plate 12, glass, polycarbonate, high refractive index polymer (http: // Other transparent materials such as www.mgc.co.jp/php/files/151221.pdf) may be used.
  • the light source 14 is disposed over the entire area in the length direction along the length direction of the light incident surface of the light guide plate 12 (the extension direction of the side where the light incident surface of the light guide plate 12 contacts the light output surface). Light enters the light guide plate 12 from the light incident surface.
  • the light source 14 of the present embodiment is configured by arranging a plurality of LEDs (Light Emitting Diodes), which are point light sources, in a line.
  • LEDs Light Emitting Diodes
  • other point light sources such as LD (Laser Diode: laser diode) and an incandescent lamp may be used, or linear light sources such as a cold cathode tube, a hot cathode tube, and a neon tube are used. May be
  • the light source 14 is connected to a first power supply (DC: DC power supply) 16 via a first switch 18 by an electric wire.
  • a first power supply DC: DC power supply
  • FIG. 1A when the first switch 18 is set to the on state, the light source 14 is connected to the first power supply 16 and turned on.
  • FIG. 1B when the first switch 18 is set to the off state, the light source 14 is disconnected from the first power supply 16 and turned off.
  • the liquid crystal film 20 has a pair of transparent substrates 28A, 28B, a light scattering layer 30, and a pair of electrodes 32A, 32B.
  • the liquid crystal film 20 When a voltage is applied to the pair of electrodes 32A and 32B, the liquid crystal film 20 is set to a transmission mode in which light is transmitted through the light scattering layer 30, and no voltage is applied to the pair of electrodes 32A and 32B. , Is set to a scattering mode in which light is scattered by the light scattering layer 30.
  • the liquid crystal film 20 of the present embodiment is a PDLC (Polymer Dispersed Liquid Crystal: polymer dispersed liquid crystal) film, but as the liquid crystal film 20, another light scattering film other than PDLC may be used.
  • the pair of transparent substrates 28A and 28B support the light scattering layer 30, and is made of a plastic film, glass equipment, or the like. Other transparent resin films, glass devices, etc. may be used as the pair of transparent substrates 28A, 28B.
  • the light scattering layer 30 is formed by dispersing a liquid crystal material including a plurality of liquid crystal particles in a resin, and is disposed between the pair of transparent substrates 28A and 28B in contact with the pair of transparent substrates 28A and 28B. It is done.
  • the liquid crystal material when no electric field is applied, the liquid crystal material is randomly oriented, and light is scattered.
  • the liquid crystal material is aligned in the electric field direction, and light is transmitted in the electric field direction.
  • the pair of electrodes 32A and 32B generate an electric field in the thickness direction of the liquid crystal film 20 in the light scattering layer 30 when a voltage is applied, and each of them forms a pair of transparent substrates 28A and 28B.
  • ITO Indium Tin Oxide: indium tin oxide
  • the pair of electrodes 32A, 32b other transparent conductive materials such as ZnO (zinc oxide), PEDOT (polyethylenedioxythiophene), etc. may be used.
  • the pair of electrodes 32A, 32B of the liquid crystal film 20 is connected to a second power supply (AC 100 V: AC power supply) 22 through a second switch 24 by an electric wire.
  • a second power supply AC 100 V: AC power supply
  • the liquid crystal film 20 is set to the transmission mode when the second switch 24 is turned on and a voltage is applied from the second power supply 22 to the pair of electrodes 32A and 32B. Ru.
  • the liquid crystal material is oriented in the electric field direction, that is, in the thickness direction of the liquid crystal film 20, and the light incident on the liquid crystal film 20 from the thickness direction of the liquid crystal film 20 is the thickness direction of the liquid crystal film 20 It is transparent to
  • the liquid crystal film 20 is set to the scattering mode when the second switch 24 is set to the off state and a voltage is not applied from the second power supply 22 to the pair of electrodes 32A and 32B. Be done.
  • the liquid crystal material is randomly oriented, and is incident on the light guide plate 12 from the light source 14, and light incident on the liquid crystal film 20 from the light guide plate 12 is scattered by the liquid crystal film 20 to be the liquid crystal film It is emitted from 20.
  • the low refractive index layer 26A is disposed between the light guide plate 12 and the liquid crystal film 20 so as to be in contact with the light guide plate 12 and the liquid crystal film 20 and has a refractive index lower than that of the light guide plate 12. is there. Further, the low refractive index layer 26A has the electric field intensity of light, that is, the light in the entire propagation direction of the light propagating from the light incident surface of the light guide plate 12 to another side surface which is the opposite surface of the light incident surface. The thickness is reduced according to the direction from the light incident surface to the opposite surface so that the power of the light source is uniform, and the cross section is wedge-shaped. As a material of the low refractive index layer 26A, a transparent material such as silicone resin or fluorine resin is used.
  • the light guide plate 12 is made of acrylic resin
  • the low refractive index layer 26A is made of silicone resin.
  • the refractive index of the acrylic resin for sodium d-line light (wavelength 589 nm), that is, the refractive index nd1 of the light guide plate 12 is about 1.49
  • the refractive index of the silicone resin, that is, the low refractive index layer 26A The refractive index nd2 is about 1.41.
  • polycarbonate having a refractive index nd of about 1.59 and a high refractive index polymer having a refractive index nd of about 1.80 (http://www.mgc.co.jp/php/files/151221.pdf ) May be used, or a fluorine resin having a refractive index nd of about 1.35 may be used as the low refractive index layer.
  • the light incident on the inner surface of the upper surface and the lower surface of the light guide plate 12 has a critical angle or less.
  • the light is totally reflected on the inner surfaces of the upper and lower surfaces and is propagated from the light incident surface to the opposite surface.
  • the low refractive index layer 26A When the low refractive index layer 26A is disposed in contact with the light guide plate 12 as in the planar illumination device 10A, since light is an electromagnetic wave, while light is propagated from the light incident surface toward the opposing surface, Light leaks from the light guide plate 12 to the low refractive index layer 26A, and the electric field strength of the light gradually attenuates as it travels from the light incident surface to the opposite surface. As the difference ⁇ in refractive index increases, the amount of light exudation decreases, and as the difference ⁇ in refractive index decreases, the amount of light exuding increases.
  • the difference ⁇ in refractive index is about 0.1, but the difference ⁇ in refractive index is preferably 0.001 to 0.5 in consideration of the amount of light exudation. It is more preferably 0.08 to 0.45, and most preferably 0.08 to 0.14.
  • the numerical range represented by “to” includes the lower limit and the upper limit.
  • the thickness of the low refractive index layer 26A will be described.
  • FIG. 3 is a conceptual view showing the relationship between the position in the thickness direction of the light guide plate and the position in the light transport direction.
  • the position of the side where the light incident surface of the light guide plate 12 and the lower surface are in contact with each other is the origin 0 of the vertical axis x and the horizontal axis z.
  • the vertical axis x represents the position from the origin 0 in the thickness direction of the light guide plate 12, in other words, the thickness of the low refractive index layer 26A
  • the horizontal axis z represents the position from the origin 0 in the light transport direction.
  • nd1 and nd2 represent the refractive index of the light guide plate 12 and the low refractive index layer 26A
  • d represents the thickness of the light guide plate 12.
  • the low refractive index layer 26A is also disposed in contact with the upper surface of the light guide plate 12 for ease of explanation. Represents a conceptual diagram of the
  • FIG. 4 is a graph showing the relationship between the position in the thickness direction of the light guide plate at a certain position in the light transport direction and the light power.
  • the vertical axis x is the same as in FIG. 3, and the vertical axis P represents the power of light at a certain position in the light transport direction.
  • the power of light is proportional to the square of the electric field strength of light, and is uniquely determined when the thickness d of the light guide plate 12, the refractive index nd1 of the light guide plate 12 and the refractive index nd2 of the low refractive index layer 26A are determined.
  • a region between two broken lines represents the power of light in the light guide plate 12, and a hatched region outside the two broken lines is from the light exit surface of the light guide plate 12. It represents the power of light that leaks to the low refractive index layer 26A.
  • FIG. 5A is a graph in which the power of the oozed light is enlarged in the graph of FIG.
  • the vertical axis x and the horizontal axis P are the same as in the graph of FIG.
  • the graph shown to FIG. 5B interchanges and represents the vertical axis
  • the light leaks from the light guide plate 12 to the low refractive index layer 26A as the position in the thickness direction of the light guide plate 12 decreases, that is, as the thickness of the low refractive index layer 26A decreases. Power will increase. In other words, as the position in the thickness direction of the light guide plate 12 increases, that is, as the thickness of the low refractive index layer 26A increases, the power of the light that leaks out decreases.
  • the light power at the position x 0 in the thickness direction of the light guide plate 12 is 1 / e 2 (e Is the base of natural logarithms, and the power of light at position x 1 (x 0 ⁇ x 1 ) is 0.5 / e 2 .
  • the power of light that exudes at the position z 0 in the light transport direction is 1, and the power of light that exudes at the position z 1 (z 0 ⁇ z 1 ) is 0.5.
  • the thickness of the corresponding thickness of the low refractive index layer 26A at the position z 1 to position x can be the same 0.5 / e 2 .
  • the thickness of the low refractive index layer 26A can be determined in the same manner for each of the other positions in the light transport direction. This makes it possible to equalize the power of the light that leaks out over the entire area in the light transport direction, that is, the electric field strength of the light.
  • the transmission mode is set in the daytime, and the scattering mode is used in the nighttime.
  • the transmission mode and the scattering mode can be switched regardless of time.
  • the first switch 18 is turned off and the light source 14 is turned off, and the second switch 24 is turned on, and the second power source 22 receives a pair of electrodes.
  • the liquid crystal film 20 is set to the transmission mode, light incident on the liquid crystal film 20 from the thickness direction of the liquid crystal film 20 is transmitted through the liquid crystal film 20. Therefore, the liquid crystal film 20 becomes transparent, and the planar illumination device 10A functions as a transparent window.
  • the first switch 18 is turned on to turn on the light source 14 and the second switch 24 is turned off, and the pair of electrodes 32A and 32B is turned on.
  • the liquid crystal film 20 is set to the scattering mode without applying a voltage to the light source, light that is incident on the light guide plate 12 from the light source 14 and further incident on the liquid crystal film 20 from the light guide plate 12 is scattered by the liquid crystal film 20 The light is emitted from the liquid crystal film 20. Therefore, the planar illumination device 10A functions as planar illumination.
  • planar illumination device 10A can be used as a transparent window, for example, in the daytime, and can be used as planar illumination at night.
  • FIG. 6 and FIG. 7 are photographs of the state in which the planar illumination device of the present embodiment and the conventional light guide plate are arranged side by side in daytime and nighttime.
  • the planar illumination device 10A of this embodiment is disposed on the right side
  • the conventional light guide plate is disposed on the left side.
  • the conventional light guide plate is in a state where the light source is turned off.
  • the conventional light guide plate is a mere transparent acrylic plate, and the keyboard on the back side can be seen through.
  • the planar illumination device 10A of the present embodiment the light source is turned off and the liquid crystal film 20 is set to the transmission mode. In this case, light incident on the liquid crystal film 20 from the thickness direction of the liquid crystal film 20 is transmitted through the liquid crystal film 20, and the liquid crystal film 20 becomes transparent. Therefore, the planar illumination device 10A becomes a transparent window and the chair on the back side I can see through.
  • the conventional light guide plate is in a state where the light source is turned on.
  • light emitted from the light source is introduced into the light guide plate from one side surface which is the light incident surface of the light guide plate, is guided from the light incident surface to the other side surface which is the opposite surface, and is opposed It is emitted from
  • the planar illumination device 10A of the present embodiment the light source 14 is turned on and the liquid crystal film 20 is set in the scattering mode. In this case, the light incident on the light guide plate 12 from the light source 14 and the light incident on the liquid crystal film 20 from the light guide plate 12 are scattered by the liquid crystal film 20 and emitted, and the planar illumination device 10A becomes planar illumination. ing.
  • the planar illumination device 10A can set the liquid crystal film 20 in the transmission mode or the scattering mode according to the presence or absence of voltage application to the pair of electrodes 32A and 32B, so the structure is simple and inexpensive. It can be manufactured. Further, by arranging the low refractive index layer 26A between the light guide plate 12 and the liquid crystal film 20, the electric field intensity of the light, that is, the light power can be made uniform over the entire area in the light conveyance direction. The brightness of the light emitted from the light emission surface of the light guide plate 12 can be made uniform.
  • the thickness of the low refractive index layer 26A is reduced according to the direction from the light incident surface to the opposing surface, but this is not essential. Accordingly, the refractive index nd2 of the low refractive index layer 26A may be reduced.
  • FIGS. 8A and 8B are side conceptual views of the second embodiment showing the configuration of the planar illumination device of the present invention.
  • the planar illumination device 10B shown in FIGS. 8A and 8B is obtained by replacing the low refractive index layer 26A with a low refractive index layer 26B in the planar illumination device 10A shown in FIGS. 1A and 1B. That is, the planar illumination device 10 B includes the light guide plate 12, the light source 14, the first power supply 16, the first switch 18, the liquid crystal film 20, the second power supply 22, and the second switch 24. , And the low refractive index layer 26B.
  • the low refractive index layer 26 B is disposed between the light guide plate 12 and the liquid crystal film 20 in contact with the light guide plate 12 and the liquid crystal film 20, and has a refractive index lower than that of the light guide plate 12. Further, in the low refractive index layer 26B, the refractive index nd2 is reduced in the direction from the light incident surface to the opposite surface so that the electric field intensity of light, ie, the light power, becomes uniform throughout the light propagation direction. ing. The thickness of the low refractive index layer 26B does not change over the entire region in the light propagation direction, and has a rectangular parallelepiped shape.
  • the low refractive index layer 26B is, for example, a plurality of kinds of coating liquids such as silicone which gradually decrease the refractive index nd2 while scanning the low refractive index layer 26B in the light transport direction using a resin dripping device called a dispenser.
  • a coating solution in which an acrylic resin and a silicone resin are dispersed in a UV (Ultra Violet) curable resin is sequentially applied while changing the blending ratio so that the compounding amount of the resin gradually increases, and the coating solution
  • the low refractive index layer 26B applied may be bonded to the liquid crystal film 20, followed by UV curing.
  • the refractive index nd2 of the low refractive index layer 26B is reduced according to the direction from the light incident surface to the opposing surface so that the electric field intensity of light becomes uniform throughout the light propagation direction.
  • the electric field strength of the light can be made uniform over the entire light propagation direction.
  • FIG. 9 is a graph showing the power of light that leaks from the light guide plate to the low refractive index layer.
  • the vertical axis P and the horizontal axis x of the graph shown in FIG. 9 are the same as in the graph of FIG. 5B.
  • the power of light that leaks from the light guide plate 12 to the low refractive index layer 26B is represented.
  • the light power is 1 / e 2 when the refractive index difference ⁇ is 0.05, and the refractive index The light power is assumed to be 0.5 / e 2 when the difference ⁇ is 0.1. Further, it is assumed that the power of light that exudes at the position z 0 in the light transport direction is 1, and the power of light that exudes at the position z 1 (z 0 ⁇ z 1 ) is 0.5.
  • the power of the light that exudes at the positions z 0 and z 1 is the same It can be 0.5 / e 2 .
  • the refractive index of the low refractive index layer 26B can be determined in the same manner for each other position in the light transport direction. This makes it possible to equalize the power of the light that leaks out over the entire area in the light transport direction, that is, the electric field strength of the light.
  • planar illumination device 10B having the low refractive index layer 26B can obtain the same effect as the planar illumination device 10A having the low refractive index layer 26A.
  • 10A, 10B planar illumination device 12 light guide plate 14 light source 16 first power source 18 first switch 20 liquid crystal film 22 second power source 24 second switch 26A, 26B low refractive index layer 28A, 28B transparent substrate 30 light scattering Layer 32A, 32B electrode

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Abstract

L'invention concerne un dispositif d'éclairage de zone comprenant : une plaque de guidage de lumière transparente ; une source de lumière à partir de laquelle la lumière entre dans la plaque de guidage de lumière par l'intermédiaire d'une surface d'entrée de lumière de la plaque de guidage de lumière ; un film de cristaux liquides qui est réglé sur un mode de transmission pour transmettre de la lumière lorsqu'une tension est appliquée à une paire d'électrodes et sur un mode de diffusion pour la diffusion de la lumière lorsqu'aucune tension n'est appliquée à la paire d'électrodes ; et une couche à faible indice de réfraction qui est disposée entre la plaque de guidage de lumière et le film de cristaux liquides et qui a un indice de réfraction inférieur à un indice de réfraction de la plaque de guidage de lumière. La différence entre l'indice de réfraction de la plaque de guidage de lumière et l'indice de réfraction de la couche à faible indice de réfraction est de 0,001 à 0,5. L'épaisseur ou l'indice de réfraction de la couche à faible indice de réfraction diminue de la surface d'entrée de lumière vers une surface opposée de telle sorte que l'intensité de champ électrique de la lumière devienne uniforme dans toutes les zones dans une direction de propagation de la lumière.
PCT/JP2018/039297 2017-11-07 2018-10-23 Dispositif d'éclairage de zone WO2019093116A1 (fr)

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JP2004151550A (ja) * 2002-10-31 2004-05-27 Seiko Epson Corp 電気光学装置及び電子機器
JP2013513218A (ja) * 2009-12-08 2013-04-18 スリーエム イノベイティブ プロパティズ カンパニー 光ガイド及び低屈折率フィルムを組み込んだ光学構造体
JP2017519338A (ja) * 2014-05-30 2017-07-13 スリーエム イノベイティブ プロパティズ カンパニー 可変視角を有する光学システム

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JP2013513218A (ja) * 2009-12-08 2013-04-18 スリーエム イノベイティブ プロパティズ カンパニー 光ガイド及び低屈折率フィルムを組み込んだ光学構造体
JP2017519338A (ja) * 2014-05-30 2017-07-13 スリーエム イノベイティブ プロパティズ カンパニー 可変視角を有する光学システム

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