WO2006112093A1 - Appareil d’eclairage planaire - Google Patents

Appareil d’eclairage planaire Download PDF

Info

Publication number
WO2006112093A1
WO2006112093A1 PCT/JP2005/023764 JP2005023764W WO2006112093A1 WO 2006112093 A1 WO2006112093 A1 WO 2006112093A1 JP 2005023764 W JP2005023764 W JP 2005023764W WO 2006112093 A1 WO2006112093 A1 WO 2006112093A1
Authority
WO
WIPO (PCT)
Prior art keywords
led
guide plate
light guide
light
planar
Prior art date
Application number
PCT/JP2005/023764
Other languages
English (en)
Japanese (ja)
Inventor
Shingo Suzuki
Daisuke Nakayama
Original Assignee
Minebea Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Minebea Co., Ltd. filed Critical Minebea Co., Ltd.
Publication of WO2006112093A1 publication Critical patent/WO2006112093A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0015—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/002—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces
    • G02B6/0021—Means for improving the coupling-in of light from the light source into the light guide provided on the surface of the light guide or in the bulk of it by shaping at least a portion of the light guide, e.g. with collimating, focussing or diverging surfaces for housing at least a part of the light source, e.g. by forming holes or recesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/003—Lens or lenticular sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0013—Means for improving the coupling-in of light from the light source into the light guide
    • G02B6/0023—Means for improving the coupling-in of light from the light source into the light guide provided by one optical element, or plurality thereof, placed between the light guide and the light source, or around the light source
    • G02B6/0031—Reflecting element, sheet or layer
    • 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
    • H01L33/52—Encapsulations
    • H01L33/54—Encapsulations having a particular shape

Definitions

  • the present invention relates to a sidelight type planar illumination device, and more particularly to a planar illumination device that is used as an illumination means for a liquid crystal display device.
  • Liquid crystal display devices are widely used as display means of today's electronic devices, but since this liquid crystal display device is not self-luminous, it is necessary to ensure visibility at night or in dark places.
  • the lighting means is necessary.
  • planar illumination devices have been used as such illumination means.
  • a sidelight type planar lighting device is widely used.
  • a sidelight type planar illumination device is composed of a light guide plate having translucency and a bar light source or one or more point light sources arranged on the side end face of the light guide plate.
  • surface illumination devices in the form of a point light source capable of simplifying the drive circuit have been used due to an increase in applications to small electronic devices such as portable information terminals. Yes.
  • FIG. 15 schematically shows the light guide plate 12 and a plurality of point light sources (LEDs) 14 arranged on the side end surfaces of the side light type planar illumination device 10.
  • the planar illumination device 10 using the LED 14 shown in FIG. 15 has a light guide plate 12 illuminated by the LED 14 because the light emitted from the LED 14 to the light guide plate 12 has a certain directivity.
  • the vicinity of the LED 14 is clearly divided into bright part A and buttocks B.
  • An optical diffuse reflection pattern 12b is provided, or as shown in FIG.
  • a semi-cylindrical recess 12c to be fitted is provided, and light from the LED chip 17 is emitted radially from a slit formed in the protrusion 16a (see, for example, Patent Document 1).
  • LED18 like LED18 A lamp house 20 that covers the lamp 19 and controls the directivity of light by changing the height of the lamp house 20 and the inclination angle of the inclined surface 20a (for example, Patent Document 2). reference.).
  • reference numeral 22 denotes a translucent resin for sealing the LED chip 19 in the lamp house 20.
  • Patent Document 1 JP-A-10-199316 ([0023], [0026] to [0028])
  • Patent Document 2 Japanese Patent Application Laid-Open No. 2002-217459 ([Claim 1], FIG. 8)
  • FIGS. 19 (a) and 19 (b) show the locus of light rays emitted from the LED 14 when the reflectors 36 are provided on the upper and lower surfaces of the LED 14 in the planar illumination device 10 shown in FIG. .
  • FIG. 19 (a) and 19 (b) show the locus of light rays emitted from the LED 14 when the reflectors 36 are provided on the upper and lower surfaces of the LED 14 in the planar illumination device 10 shown in FIG. .
  • 19A shows the light guide plate 12 from the side surface 14b other than the surface 14a facing the light guide plate 12 of the LED 14 (hereinafter also referred to as “side surface in a direction parallel to the light guide plate” or simply “side surface”).
  • the trajectory of the light beam emitted in the direction (hereinafter also referred to as “forward”) is schematically shown using the symbols LF1, LF2, and LF3.
  • Each of these trajectories is a force with different emission angles from the side surface 14b of the LED.
  • Light rays LF1 and LF2, whose emission angles are relatively gentle, are totally reflected by the surface of the light guide plate 12 and travel inside the light guide plate 12.
  • the light beam LF3 having a relatively steep emission angle is reflected by the reflecting plate 36 and enters the light guide plate 12.
  • FIG. 19 (b) shows the trajectory of light emitted from the side surface 14b of the LED in the direction opposite to the direction of the light guide plate 12 (hereinafter also referred to as “rear”).
  • This is shown schematically using LR2.
  • These loci LR1 and LR2 both reflect repeatedly between the reflector 36 and the side surfaces 14b and 14c of the LED, leak out to the rear of the LED 14, and do not enter the light guide plate 12. . Therefore, unless such leakage light is used effectively, it will be difficult to further increase the brightness and make the brightness uniform of the planar illumination device using LEDs.
  • the light emitted forward as shown in FIG.
  • the light beams LF2 and LF3 having a relatively steep emission angle have a relatively steep incident angle to the light guide plate 12.
  • the percentage of light reaching the tip of the light guide plate 12 is low. It has been found that the planar lighting device using LEDs does not contribute sufficiently to further increasing the brightness and making the brightness uniform. .
  • the present invention has been made in view of the above problems, and an object of the present invention is to further increase the luminance and make the luminance uniform in a planar lighting device in which a light guide plate is combined with an LED. There is.
  • a planar illumination device is a planar illumination device including a plate-shaped light guide plate and an LED disposed on a side end surface of the light guide plate.
  • a reflecting plate is disposed along a side surface in a direction parallel to the light guide plate, and a plurality of fine prisms having a triangular cross section with different inclination angles of the front and rear inclined surfaces are arranged on the surface of the reflecting plate facing the LED. It is characterized by being.
  • a light beam emitted backward from the side surface of the LED can be reflected forward by the front inclined surface of the fine prism of the reflection plate and can enter the light guide plate.
  • the incident angle to the light guide plate is relaxed and the percentage of light reaching the tip of the light guide plate is increased. be able to.
  • the fine prism of the reflecting plate has a front inclined surface formed with a relatively gentle slope and a rear inclined surface formed with a relatively steep slope.
  • the light beam emitted backward from the side surface of the LED is reflected forward by the relatively gently inclined front inclined surface, thereby reducing the incident angle to the light guide plate, and The ratio of light reaching the tip can be increased.
  • an angle formed between the front inclined surface and a plane facing the surface on which the fine prisms of the reflector plate are formed is 20 ° or more and 50 ° or less, and the rear inclined surface and the opposite surface are formed.
  • the angle formed with the plane of the shot plate is 70 ° or more and is not parallel to the front inclined surface. It is desirable that the angle is in the range.
  • the productivity of the reflector is the highest.
  • the ridge lines of the fine prism are formed concentrically, it is possible to cause the reflector to exhibit an optimum light beam angle conversion function over a wide angle in front of the LED.
  • each ridgeline of the fine prism is formed in a concentric polygonal shape, it is possible to exert an effective angle conversion function of light rays on the reflector over a wide angle in front of the LED.
  • the LED does not have a lamp house and the translucent resin that seals the LED chip is exposed, and the outer shape of the translucent resin is forward in the light emitting direction of the LED.
  • a value obtained by dividing the protrusion height by the radius of the continuous curved surface is preferably in the range of 0.3 or more and 0.6 or less.
  • the LED does not have a lamp house and the translucent resin that seals the LED chip is exposed, so that the thickness of the lamp house does not increase, and the surface illumination device can be made thinner. Will be promoted.
  • the outer shape of the translucent resin since the outer shape of the translucent resin has the above-mentioned predetermined shape, it contributes to the uniformity of the luminance of the front illumination device and the luminance of the planar illumination device, which contributes to higher brightness of the planar illumination device. It is possible to balance the angle of the emitted light of the LED at a high level.
  • the radius of the projecting portion constituted by the continuous curved surface is not less than a value obtained by multiplying the length when the LED chip is projected in a direction orthogonal to the light guide plate by 1.5. It is hoped that it will be formed to become.
  • the LED chip is completely sealed in the translucent resin while the outer shape of the translucent resin has the predetermined shape.
  • the present invention is configured as described above, it is possible to further increase the luminance and make the luminance uniform in the planar lighting device in which the light guide plate is combined with the LED.
  • FIG. 1 is a perspective view showing an example in which a reflecting plate is arranged along a side surface in a direction parallel to an LED light guide plate in a planar lighting device according to an embodiment of the present invention; ) Is an exploded view, and (b) is a partially enlarged view of the reflector.
  • FIG. 2 is a view A in FIG. 1 (b).
  • FIG. 3 is a partially enlarged view of the reflector shown in FIGS. 1 and 2.
  • FIG. 3 (a) shows a case where the angle formed between the rear inclined surface of the fine prism of the reflector and the plane of the reflector is a right angle.
  • (B) shows the case where the angle is an obtuse angle.
  • FIG. 4 is a diagram showing the trajectory of light emitted from the side surface of the LED in the planar illumination device of FIG. 1 and FIG. 2, (a) shows the trajectory of outgoing light, and (b) Indicates the trajectory of the outgoing light beam to the rear.
  • FIG. 5 is a perspective view showing a state in which a reflector according to an application example is arranged along a side surface in a direction parallel to the LED light guide plate of the planar illumination device according to the embodiment of the present invention; a) is an exploded view, and (b) is a partially enlarged view of the reflector.
  • FIG. 6 is an arrow C view of FIG. 5 (b).
  • FIG. 7 shows a reflector according to still another example of the planar lighting device according to the embodiment of the present invention, together with a manufacturing procedure, (a) showing an initial step and (b) showing an intermediate step. , (C) shows the completed state.
  • FIG. 8 is a schematic diagram showing an outer shape of a translucent resin for sealing an LED chip of an LED in the planar lighting device according to the embodiment of the present invention.
  • FIG. 9 is an external perspective view showing a specific structural example of the LED shown in FIG.
  • FIG. 10 is a cross-sectional view showing a specific structure example of the LED shown in FIG.
  • FIG. 11 shows an LED chip sealed inside the LED shown in FIG. 8, where (a) is a plan view and (b) is a side view.
  • FIG. 12 A table summarizing the half-value width ⁇ indicating the angle of emitted light and the forward emitted light quantity ratio ⁇ .
  • FIG. 13 A graph based on the straight line in FIG.
  • FIG. 14 is an explanatory diagram for explaining the full width at half maximum of FIGS. 12 and 13.
  • FIG. 15 is a plan view showing a basic configuration of a planar illumination device using a conventional LED.
  • FIG. 16 is a plan view showing a conventional planar lighting device in which measures are taken to obtain average brightness.
  • FIG. 17 is a plan view showing a conventional planar lighting device in which measures are taken to obtain average brightness.
  • FIG. 18 A plan view showing a conventional LED in which measures are taken to obtain an average brightness.
  • FIG. 19 is a diagram showing a locus of light rays emitted from the side surface of the LED in the surface illumination device in the process of developing the surface illumination device according to the present invention.
  • FIG. The trajectory is shown, and (b) shows the trajectory of the outgoing light beam backward.
  • 10 planar illumination device
  • 12 light guide plate
  • 24 LED
  • 24b side surface parallel to the light guide plate
  • 38, 42, 46 reflector
  • 38a facing surface of LED
  • 38b Plane facing the surface on which the fine prism is formed
  • 40, 44 fine prism
  • 40a front inclined surface
  • 40b rear inclined surface
  • the planar illumination device includes a plate-shaped light guide plate 12 and LEDs 24 arranged on the side end surfaces of the light guide plate 12. It is. As shown in FIGS. 1 to 3, a reflector 38 is disposed along a side surface of the LED 24 in a direction parallel to the light guide plate 12. A plurality of fine prisms 40 having a triangular cross section with different inclination angles of the front and rear inclined surfaces are arranged on the surface 38a of the reflecting plate 38 facing the LED 24. The pitch of the fine prism 40 is within the range where there is no adverse effect due to light diffraction. Set as appropriate. In the example shown in FIGS. 1 and 2, each ridgeline of the fine prism 40 of the reflecting plate 38 is formed in parallel and linear.
  • the LED 24 used here does not have a lamp house as shown in FIGS. 8 to 10 and has a structure exposed as a translucent resin force protrusion 26 that seals the LED chip 25. (Note that LED24 will be explained later.) Further, a notch portion 12d that follows the outer shape of the protruding portion 26 is formed on the side end surface 12a of the light guide plate 12 facing the LED 24.
  • the fine prism 40 of the reflector 38 is formed such that the front inclined surface 40a has a relatively gentle inclination and the rear inclined surface 40b has a relatively steep inclination.
  • the angle ⁇ 1 formed between the front inclined surface 40a and the plane 38b facing the surface 38a on which the fine prism 40 of the reflecting plate 38 is formed is preferably 20 ° or more and 50 ° or less.
  • the angle ⁇ 2 formed by the rear inclined surface 40b and the flat surface 38b of the reflecting plate 38 is preferably 70 ° or more, and is formed in an angle that is not parallel to the front inclined surface 40a.
  • FIG. 3A shows a case where ⁇ 2 is a right angle, and it becomes easy to form the fine prism 40 on the reflecting plate 38 using a mold.
  • the example in Fig. 3 (b) shows the case where ⁇ 2 is an obtuse angle.
  • the prism shape of Fig. 3 (b) is molded with a mold, the slide insert slides in the direction of arrow B, i.e., the direction in which the negatively inclined rear inclined surface 40b can be removed. It is possible to perform molding by using a mold with a metal plate or by using an elastically deformable material such as rubber as the material of the reflector 38 and by performing die cutting of the reflector 38 by so-called ⁇ reasoning '' It becomes.
  • the base of the reflector 38 is made of PET (Polyethylene Terepht halate) and has a thickness of 0.05 mm.
  • the fine prism 40 is a so-called 2p method (injecting a transparent liquid resin that can be controlled arbitrarily at room temperature, such as a UV curable resin, into a prism molding die and curing it integrally with the substrate. It can be formed by the manufacturing method. It is also possible to directly transfer the shape of the fine prism 40 to the thermoplastic resin film by a hot press mold in which the prism shape is formed.
  • the anti-inclined surface of the reflecting plate 38 has a high anti-inclined surface such as aluminum or silver on the prism forming surface. It may also be configured by applying a white or milky white paint that may be formed by forming a metal thin film having a high emissivity. Furthermore, it is also possible to combine the above-described structures, in which the anti-inclined surface of the reflecting plate 38 may be formed by an increased reflection film formed by laminating a dielectric coating film. In any case, since the ridge lines of the fine prisms 40 of the reflector 38 are formed in parallel and straight lines (see FIG. 1 (b)), a reflector having a large area is formed in the manufacturing process. The reflector 38 can be mass-produced by cutting it out to a required size.
  • the light guide plate 12 is made of polycarbonate, has a width of 30 mm, a length of 40 mm, and a thickness of 0.6 mm. (Scattering pattern) is formed. Further, the entire lower surface of the light guide plate 12 (the surface from which light is not emitted) is provided with a reflector made of a reflective material such as white resin or silver plating. Furthermore, the light diffusion plate and two brightness enhancement films with the prism directions orthogonal to each other are overlaid on the upper surface of the light guide plate 12 (the surface from which light is emitted), so that the backlight is Composed.
  • the reflector 38 only needs to have at least an area that covers the side surfaces 24b and 24c of the LED 24, but may be formed into a simple rectangle as illustrated in consideration of productivity and the like.
  • the reflector, diffuser, and brightness enhancement film stacked on the light guide plate 12 as described above may be installed on the reflector 38 if there is a demand to reduce the thickness of the entire planar lighting device 10. If the demand for power is eased, the notch is not formed in the installation part of the reflector 38, but it is installed on the reflector 38.
  • FIG. 4 shows the locus of light rays emitted from the LED 24 in the planar illumination device 10 in which the reflectors 38 are provided on the upper and lower surfaces of the LED 24 according to the embodiment of the present invention.
  • FIG. 19 corresponds to FIG. 19 showing a light reflection locus of the planar illumination device in the process of developing the planar illumination device according to the invention.
  • the surface provided with the fine prism 40 is opposed to each of the side surfaces 24b and 24c of the LED 24.
  • the reflection plate 38 is arranged so as to.
  • the outgoing light beams LF4 and LF5 emitted from the side surface 24b of the LED 24 have a relatively steep angle.
  • the angle of light incident on the light guide plate 12 becomes relatively gradual because the angle of the light beam is reflected by the inclined surface 40a (see FIG. 3) and converted.
  • the forward angle light emitted from the side surface 24c of the LED 24 is also subjected to the same angle conversion action. It will also be understood that light rays emitted in a direction perpendicular to the side surfaces 24b and 24c of the LED 24 are subjected to the same angle conversion action.
  • the light beam LR3 emitted backward from the side surface 24b of the LED 24 is also reflected by the front inclined surface 40a (see Fig. 3) of the fine prism 40, and The light is incident on the light guide plate 12 by changing the angle.
  • illustration is omitted, it will be apparent that the backward angle rays emitted from the side surface 24c of the LED 24 are also subjected to the same angle conversion action.
  • FIG. 5 and FIG. 6 show application examples of the reflector 38.
  • the ridge line forces of the fine prisms 44 of the reflector 42 are formed concentrically.
  • the relationship between the slanted front and back slopes of the fine prism 44 and the flat surface 42b of the reflector 42 is the same as that of the reflector 38 shown in FIGS. It is desirable that the center of the concentric circle of the fine prism 44 coincides with the LED chip 25 of the LED 24.
  • FIG. 7 shows another application example of the reflector.
  • the reflector 46 shown in FIG. 7 (c) is obtained by cutting out a plurality of triangular pieces 48 from the reflector 38 shown in FIG. 7 (a) as shown in FIG. 7 (b), as shown in FIG. 7 (c). In this manner, each triangular piece 48 is fixed in a fan shape, and each ridgeline of the fine prism 40 is formed in a concentric polygonal shape. Further, the reflector 46 in FIG. 7 (c) may be further cut into a rectangle if necessary.
  • the relationship between the front and rear inclined surfaces of the fine prism 40 and the plane of the reflecting plate 46 is the same as that of the reflecting plate 38 shown in FIGS. 1 to 4, and detailed description thereof is omitted. Also in this example, it is desirable that the center of the concentric polygon of the fine prism 40 is coincident with the LED chip 25 of the LED 24.
  • the outer shape of the translucent resin 26 has a protruding portion 28 formed of a continuous curved surface protruding forward in the light emitting direction of the LED 24. Also illustrated In this example, the protrusion 28 is perpendicular to the light guide plate in the direction parallel to the light guide plate (the direction parallel to the paper surface of the light guide plate 12 shown in FIG. 15) (the paper surface of the light guide plate 12 shown in FIG. 15). And a base 29 made of a rectangular parallelepiped translucent resin.
  • the continuous curved surface constituting the protruding portion 28 has a constant radius R in the illustrated example.
  • the protrusion height of the protrusion 28 protrusion height from the base 29
  • the range is 0.3 ⁇ H /R ⁇ 0.6, more preferably 0.4 ⁇ H / R ⁇ 0 It is formed to be in the range of 5.
  • the radius of the protrusion 28 is the length when the LED chip 25 is projected in a direction perpendicular to the light guide plate (the length in the direction parallel to the longitudinal direction of the LED 24. It is formed so that it is equal to or greater than 1.5 multiplied by 1.5 (1.5X ⁇ R).
  • the translucent resin 26 has a peripheral force around the LED chip 25.
  • a layer 30 mixed with yttrium-aluminum-garnet (YAG) fine particles activated by cerium, which is a phosphor emitting yellow light, in a hard silicone resin, and its surroundings. It has a structure in which a transparent hard silicone resin layer 32 is added to the (upper layer). Therefore, in the illustrated example, the protruding portion 28 is formed in the transparent hard silicone resin layer 32.
  • the LED chip 25 has a light emitting layer 25b made of a nitride compound semiconductor such as GaN or GaAIN formed on a sapphire substrate 25a as shown in FIG. 11 (blue light emitting element). Is used. Then, as shown in FIG.
  • the LED chip 25 is bonded onto a substrate (PCB) 34 having an electrode portion, and an anode, a force sword electrode formed on the LED chip 25 and a wiring pattern on the substrate 34 are connected.
  • PCB substrate
  • It has a structure connected with gold wire of ⁇ 20 / im. 9 to 11 show examples of specific dimensions of the LED 24 and the LED chip 25 (unit: mm).
  • the LED 24 having the above structure, part of the blue light emission of the LED chip 25 is absorbed by the YAG fine particles (phosphor) of the YAG fine particle mixed layer 30 and converted to a longer wavelength than the light emission of the LED chip 25.
  • the LED chip 25 emits a pseudo white light by causing a color mixture with the blue light emission.
  • the YAG fine particle mixed layer 30 of the translucent resin 26 is not limited to the structure in which the transparent layer 32 is completely separated into two layers as shown in FIGS. 9 and 10, but at least around the blue light emitting LED chip 25. It is also possible to adopt a structure in which only the YAG fine particle mixed layer 30 is formed and the entire periphery is covered with the transparent layer 32.
  • the translucent resin 26 may be a thermosetting transparent resin, such as a transparent epoxy resin, in addition to the hard silicone resin, as long as it is a transparent resin having heat resistance.
  • a thermosetting transparent resin such as a transparent epoxy resin
  • highly heat-resistant thermoplastic resins and inorganic materials such as glass can be applied as necessary.
  • FIG. 12 shows a half-value width indicating the angle of the emitted light of the LED 24 by variously changing the H / R value of the LED 24 used in the planar lighting device according to the embodiment of the present invention.
  • the changes in ⁇ and the forward emission light quantity ratio ⁇ are summarized in a chart.
  • FIG. 13 is a graph based on the values in FIG.
  • the angle of the emitted light when the emission intensity 1 / 2P is obtained is called the “half-value width” and is a value generally used as an index of the emitted light distribution.
  • the “front emission light quantity ratio” contributes to higher brightness of the planar lighting device that is emitted in front of the LED (including the upper and lower spaces) out of the omnidirectional light emitted from the LED. This is a value that represents the ratio of the former when classified into light and light that is emitted behind (including the space above and below) the LED and does not contribute to the high brightness of the planar lighting device.
  • the LED used in the planar illumination device according to the embodiment of the present invention is not limited to the LED 24 shown in FIG. 8 and FIG. It will be clear that the type of LED is also applicable.
  • light guide plate 12 LED24 Needless to say, by providing a light incident prism (optical diffuse reflection pattern) on the opposite surface, the light emission distribution of light incident from the LED to the light guide plate can be controlled more precisely. That is.
  • the light beam (LR3) emitted backward from the side surfaces 24b and 24c of the LED 24 is reflected by the front inclined surface 40a (FIG. 3) of the fine prism 40 of the reflector 38. It is possible to reflect the light forward and enter the light guide plate 12.
  • the light beams (LF4, LF5) emitted forward from the side surfaces 24b, 24c of the LED 24 are also reflected to the front inclined surface 40a to the light guide plate 12.
  • the light incident angle of the light guide plate 12 can be relaxed, and the proportion of light reaching the tip of the light guide plate 12 can be increased.
  • the front inclined surface 40a has a relatively gentle inclination
  • the rear inclined surface 40b has a relatively steep inclination, so that the side surfaces 24b, 24c of the LED 24 are formed.
  • Force The light beam (LR3) emitted backward is reflected forward by the relatively gently inclined front inclined surface 40a, so that the light incident angle to the light guide plate 12 is relaxed, and the tip of the light guide plate 12 is The rate of light reaching up to can be increased.
  • the light S emitted from the side surfaces 24b and 24c of the LED 24 forward is also a force S to increase the effect of relaxing the incident angle on the light guide plate 12.
  • the reflecting plate is formed at an angular force of 20 ° or more and 50 ° or less between the front inclined surface 40a and the plane 38b facing the surface on which the fine prism 40 of the reflector 38 is formed, and the rear inclined surface 40b. Reflecting while considering the productivity of the reflecting plate, which is desired to be formed at an angle of 70 ° or more with respect to the flat surface 38b of the reflecting plate 38 and not parallel to the front inclined surface 40a. It becomes possible to exhibit the light beam angle conversion action required for the plate.
  • each ridgeline of the fine prism 40 of the reflector 46 is formed in a concentric polygonal shape. It is possible to cause the reflecting plate 46 to exhibit an effective angle conversion effect of light over a wide angle in front.
  • the LED 24 does not have a lamp house, and since the translucent resin 26 that seals the LED chip 25 is exposed, the thickness of the lamp house does not increase. Thinning of the equipment will be promoted.
  • the outer shape of the translucent resin has a shape that satisfies 0.3 ⁇ H / R ⁇ 0.6, the ratio of the amount of light emitted from the front of the LED that contributes to higher brightness of the planar lighting device and Therefore, it is possible to balance the half-value width ⁇ of the LED, which contributes to uniform brightness of the planar lighting device, at a high level.
  • the radius R force of the protruding portion 28 of the LED 24 is formed to satisfy 1.5X ⁇ R, so that the LED chip 25 is not exposed from the translucent resin 26. It is completely sealed. Therefore, it is possible to reliably increase the yield of LED24 and reduce the cost of the planar lighting device.
  • a notch 12d is formed on the side end surface 12a of the light guide plate 12 facing the LED 24 so as to follow the outer shape of the projecting portion 28, the translucent resin 26 of the LED 24 and the light guide plate 12
  • the light emission distribution of the light entering the light guide plate from the LED 24 can be made equal to the light emission distribution of the LED alone, contributing to the uniform brightness of the planar lighting device. That power S is said.
  • the continuous curved surface constituting the protruding portion 28 of the LED 24 has a constant radius R as shown in the figure.
  • the protruding portion 28 has a constant radius. Even if it is configured by a spherical surface or the radius R is gradually changed from the top part of the projecting part 28 toward the base part 29, the above-described effects can be obtained.
  • planar illumination device according to the embodiment of the present invention can be applied to so-called backlights and front lights.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Planar Illumination Modules (AREA)
  • Liquid Crystal (AREA)

Abstract

Selon l’invention, un faisceau (LR3) émis vers l’arrière à partir de plans latéraux (24b, 24c) d’une diode électroluminescente (24) est réfléchi vers l’avant par un plan incliné avant d’un prisme fin (40) d’une plaque réfléchissante (38) et peut entrer dans une plaque de guidage de lumière (12). Un angle d’arrivée de lumière à la plaque de guidage de lumière (12) est modifié et une vitesse de lumière atteignant une section terminale avant de la plaque de guidage de lumière (12) est augmentée en permettant aux faisceaux (LF4, LF5) émis vers l’avant à partir des plans latéraux (24b, 24c) de la diode électroluminescente (24) d’être réfléchis par le plan incliné avant du prisme fin (40). Dans le prisme fin (40) de la plaque réfléchissante (38), le plan incliné avant est incliné relativement en douceur et le plan incliné arrière est incliné relativement en pente raide.
PCT/JP2005/023764 2005-03-31 2005-12-26 Appareil d’eclairage planaire WO2006112093A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2005-103444 2005-03-31
JP2005103444A JP2006286348A (ja) 2005-03-31 2005-03-31 面状照明装置

Publications (1)

Publication Number Publication Date
WO2006112093A1 true WO2006112093A1 (fr) 2006-10-26

Family

ID=37114835

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/JP2005/023764 WO2006112093A1 (fr) 2005-03-31 2005-12-26 Appareil d’eclairage planaire

Country Status (3)

Country Link
JP (1) JP2006286348A (fr)
TW (1) TW200706804A (fr)
WO (1) WO2006112093A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5277610B2 (ja) 2007-10-29 2013-08-28 日亜化学工業株式会社 発光装置及び面発光装置並びに発光装置用パッケージ
JP5113594B2 (ja) * 2008-04-03 2013-01-09 ミネベア株式会社 線状光源装置、および面状照明装置
JP5646837B2 (ja) * 2009-11-24 2014-12-24 ミネベア株式会社 光源装置、および面状照明装置
EP2597363A1 (fr) * 2011-11-28 2013-05-29 Research In Motion Limited Appareil de guide lumineux
US8746944B2 (en) 2011-11-28 2014-06-10 Blackberry Limited Light guide apparatus having a light source and a reflector
KR101405046B1 (ko) 2012-11-20 2014-06-13 희성전자 주식회사 분리형 가이드 패널 및 이를 갖는 측면 조광형 백라이트 장치

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09298008A (ja) * 1996-05-02 1997-11-18 Rohm Co Ltd 面発光照明装置
JPH10247412A (ja) * 1997-03-03 1998-09-14 Omron Corp 面光源装置
JPH1153919A (ja) * 1997-08-04 1999-02-26 Sanken Electric Co Ltd 半導体面状光源
JPH11258600A (ja) * 1998-03-10 1999-09-24 Denso Corp 液晶パネル用面光源装置
JP2000098384A (ja) * 1998-09-28 2000-04-07 Mitsubishi Chemicals Corp 面光源装置
JP2002365629A (ja) * 2001-06-06 2002-12-18 Seiko Instruments Inc 液晶表示装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH09298008A (ja) * 1996-05-02 1997-11-18 Rohm Co Ltd 面発光照明装置
JPH10247412A (ja) * 1997-03-03 1998-09-14 Omron Corp 面光源装置
JPH1153919A (ja) * 1997-08-04 1999-02-26 Sanken Electric Co Ltd 半導体面状光源
JPH11258600A (ja) * 1998-03-10 1999-09-24 Denso Corp 液晶パネル用面光源装置
JP2000098384A (ja) * 1998-09-28 2000-04-07 Mitsubishi Chemicals Corp 面光源装置
JP2002365629A (ja) * 2001-06-06 2002-12-18 Seiko Instruments Inc 液晶表示装置

Also Published As

Publication number Publication date
TW200706804A (en) 2007-02-16
JP2006286348A (ja) 2006-10-19

Similar Documents

Publication Publication Date Title
WO2006087879A1 (fr) Dispositif d'eclairage plan
CN109416163B (zh) 照明模块
TWI426206B (zh) 發光二極體裝置
RU2512110C2 (ru) Светодиод с прессованной двунаправленной оптикой
KR101227609B1 (ko) 전광표시침과 도광체
KR20080078845A (ko) 방사상 프리즘 광 전환기를 갖는 ｌｅｄ 이미터
CN111025743B (zh) 光源模块及显示装置
EP2340569A1 (fr) Dispositif électroluminescent
CN111458925A (zh) 光源模块及显示装置
US10197238B2 (en) Lighting apparatus
CN109814189B (zh) 光学器件以及包括光学器件的光源模块
WO2006112093A1 (fr) Appareil d’eclairage planaire
WO2009104793A1 (fr) Corps de guide de lumière, système de rétroéclairage et terminal portatif
US20210372594A1 (en) Lighting module and lighting device comprising same
JP4720978B2 (ja) 面状照明装置
KR20120056016A (ko) 글레어 저감 조명장치
KR102249863B1 (ko) 조명 부재 및 이를 이용하는 조명 장치
KR20180039787A (ko) 렌즈 일체형 발광 모듈
JP2009134883A (ja) 導光板および平面照明装置
KR20100108549A (ko) 하이브리드 상부 반사기를 갖는 측면 발광 장치
KR20220019975A (ko) 조명 장치 및 이를 포함하는 램프
KR20150130809A (ko) 조명 장치
CN111742175A (zh) 光束控制部件、发光装置及照明装置
KR102288768B1 (ko) 조명 모듈 및 이를 구비한 조명 장치
KR20210143482A (ko) 조명 모듈 및 이를 구비한 조명 장치

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application
NENP Non-entry into the national phase

Ref country code: DE

WWW Wipo information: withdrawn in national office

Country of ref document: DE

NENP Non-entry into the national phase

Ref country code: RU

WWW Wipo information: withdrawn in national office

Country of ref document: RU

122 Ep: pct application non-entry in european phase

Ref document number: 05820175

Country of ref document: EP

Kind code of ref document: A1

WWW Wipo information: withdrawn in national office

Ref document number: 5820175

Country of ref document: EP