EP2145216A1 - Dispositif d'éclairage et écran à cristaux liquides équipé d'un tel dispositif d'éclairage - Google Patents

Dispositif d'éclairage et écran à cristaux liquides équipé d'un tel dispositif d'éclairage

Info

Publication number
EP2145216A1
EP2145216A1 EP07802334A EP07802334A EP2145216A1 EP 2145216 A1 EP2145216 A1 EP 2145216A1 EP 07802334 A EP07802334 A EP 07802334A EP 07802334 A EP07802334 A EP 07802334A EP 2145216 A1 EP2145216 A1 EP 2145216A1
Authority
EP
European Patent Office
Prior art keywords
light
lighting device
light guide
oxide
liquid crystal
Prior art date
Legal status (The legal status 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 status listed.)
Withdrawn
Application number
EP07802334A
Other languages
German (de)
English (en)
Inventor
Georg Diamantidis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NOCTRON SOPARFI SA
Original Assignee
NOCTRON SOPARFI SA
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
Priority claimed from DE200710025573 external-priority patent/DE102007025573A1/de
Priority claimed from DE102007026795A external-priority patent/DE102007026795A1/de
Application filed by NOCTRON SOPARFI SA filed Critical NOCTRON SOPARFI SA
Publication of EP2145216A1 publication Critical patent/EP2145216A1/fr
Withdrawn legal-status Critical Current

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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, 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
    • 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
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/0036—2-D arrangement of prisms, protrusions, indentations or roughened surfaces
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources

Definitions

  • the invention relates to a lighting device according to the preamble of claim 1 and a liquid crystal screen according to the preamble of claim 24.
  • LCD screens Liquid crystal displays, commonly known as LCD screens, are enjoying increasing popularity due to their low profile construction.
  • Such LCD screens comprise a liquid crystal panel, which is illuminated by means of a lighting device of the type mentioned.
  • the illuminants used require additional components, such as a hole reflector, a Fresnel lens and usually a plurality of diffusion filters, which are arranged between the liquid crystal panel and the lighting means.
  • the diffusion filters attenuate the intensity of the radiation emitted by the illumination device by about 10% before reaching the liquid crystal panel.
  • the shadow mask has an even stronger effect. Through them, about 25% to 30% of the radiation emitted by the illumination device is absorbed, which is why only a correspondingly smaller proportion of light reaches the liquid crystal panel to be illuminated. In addition, it comes through the hole reflector to adverse interference effects.
  • the Fresnel lens is provided. However, this also causes the angle at which the screen can be viewed to be reduced, so that an image produced by it is still clearly visible.
  • the object of the invention is therefore to provide a lighting device of the type mentioned, which takes into account the above idea.
  • This lighting device By the reflection device, the light output of the light emitted by the illumination device via its first main surface light is increased.
  • This lighting device can be used in particular as a backlight for liquid crystal screens.
  • the reflection effect of the reflection device is in each case increased by one or more of the measures according to one of the claims 2 to 4.
  • the reflection effect of the reflection means and thus the luminosity of the illumination device can be further increased.
  • the measure according to claim 10 is particularly favorable, since such an advantageously homogeneous light reflection is ensured.
  • the second main surface of the light guide element is advantageously designed as specified in claim 11.
  • the light guide element preferably consists of one of the materials mentioned in claim 12.
  • the light guide element is designed as specified in claim 13, it can be used in particular as a backlight for planar formed liquid crystal screens.
  • the measure according to claim 14 ensures that the thickness of the lighting device is less influenced by the arrangement. tion of the light source is affected.
  • the measure is advantageous according to claim 17.
  • the silicone material may be, for example, silicone oil.
  • An elastic silicone compound can also be used.
  • the lighting means may e.g. are first coated with liquid silicone oil to which a hardener is added, so that the silicone oil solidifies after some time to an elastic mass.
  • Phosphor particles include phosphors and absorb incident radiation and emit radiation at least at a different (longer) wavelength. With a suitable choice of phosphor particles or phosphor particle mixtures, therefore, the radiation emitted by the lamps can be converted into radiation with a different spectrum.
  • the measure according to claim 21 ensures a homogeneous distribution of the light output. Energy efficient and efficient bulbs are specified in claim 22.
  • optical coupling layer is formed from one of the materials specified in claim 26.
  • Figure 1 is a partially broken plan view of a first embodiment of a plate-shaped lighting unit
  • Figure 2 is a section through the lighting unit of Figure 1 along the section line II-II there;
  • Figure 3 is a partially broken plan view of a second embodiment of a plate-shaped lighting unit;
  • Figure 4 is a section through the lighting unit of Figure 3 along the section line IV-IV there;
  • Figure 5 is a plan view of a third embodiment of a plate-shaped lighting unit
  • FIG. 7 shows a section corresponding to FIG. 6 through a fourth exemplary embodiment of a plate-shaped lighting unit
  • FIG. 1 is a partially broken plan view of a liquid crystal panel of a liquid crystal panel having a lighting unit of FIG. 1 arranged thereunder; FIG. and
  • a lighting unit 10 which comprises a planar light guide plate 12 made of transparent acrylic glass.
  • the light guide plate 12 may also be made of another homogeneous translucent material, such as a glass or an epoxy resin.
  • the light guide plate 12 is preferably clear.
  • the light guide plate 12 has a first main surface 14, over which useful light generated by the illumination unit 10 is emitted.
  • the optical waveguide plate 12 has a second main surface 16 (see Fig. 2) which has an upper surface indicated by serrations 17. surface roughness, which will be discussed in more detail below.
  • the light guide plate 12 On two opposite narrow surfaces of the light guide plate 12, which form the outer edges 18 and 20, the light guide plate 12 carries a respective housing 22 or 24 with ü-shaped cross-section and here not specifically provided with a reference numeral end walls.
  • the respective open side of the housing 22 or 24 points in the direction of the correspondingly adjacent outer edge 18 or 20 of the light guide plate 12.
  • the housing 22 delimits with the outer edge 18 of the light guide plate 12 an interior space 26 in which light sources in the form of a plurality of semiconductor light-emitting chips 28a are arranged, of which only one is provided with a reference number in FIG.
  • the semiconductor light-emitting chip 28a comprises, for example, an n-conducting layer of n-GaN or n-InGaN and a p-conducting layer of a III-V semiconductor material such as p-GaN. Between such an n-type and such a p-type layer, an MQW layer may be disposed. MQW is the abbreviation for "Multiple Quantum Well".
  • An MQW material includes a superlattice which has an electronic band structure altered according to the superlattice structure and accordingly emits light at other wavelengths. By selecting the MQW layer, the spectrum of the radiation emitted by the pn-semiconductor light-emitting chip can be influenced in a targeted manner.
  • the interior 26 of the housing 22 is filled with a light-conducting liquid in the form of liquid silicone oil 30, which is indicated in the figures in the form of circles and light emitted from the semiconductor light-emitting chips 28 a light to the outer edge 18 of the light guide plate 12 passes.
  • Silicone oil 30 is at the same time dissipated by the semiconductor light-emitting chip 28 a generated heat to the outside, in particular to the walls of the housing 22.
  • the p-GaN / n-InGaN semiconductor light emitting chip 28a irradiates ultraviolet light and blue light in a wavelength range of 420 nm to 480 nm when voltage is applied.
  • fine phosphor particles 32 are homogeneously distributed, which are made of color-centered transparent solid-state materials. These phosphor particles 32 are indicated in the figures as circles, which are smaller than the silicone oil 30 characterizing circles.
  • the phosphor particles 32 may also each be a mixture of several different types of phosphor particles.
  • the radiation emitted by the semiconductor light-emitting chips 28a radiation can be converted into a radiation having a spectrum which is adapted to a desired spectrum.
  • the illumination unit 10 radiates blue light.
  • the semiconductor light-emitting chips 28a are electrically connected in parallel and can be acted upon by voltage via two supply lines 34 and 36.
  • the supply lines 34 and 36 terminate in externally accessible terminals 38 and 40, respectively.
  • the supply lines 34 and 36 are not shown in FIG. 2 for the sake of clarity.
  • the semiconductor light emitting chips 28a may also be connected in series when to work with a higher supply voltage.
  • the inner walls of the housing 22 are provided with a reflection layer 42, whereby light, which is first emitted by the semiconductor light-emitting chips 28a in a direction away from the light guide plate 12, is reflected onto the same or its outer edge 18.
  • Light guide plate 12 with its second major surface 16 on a peripheral wall 43 of another housing 44 and as it forms a lid.
  • the housing 44 and the second main surface 16 of the light guide plate 12 thus define an interior 46.
  • a reflector substrate 48 in the form of a white paper sheet 48 is applied with a coupling layer 50 of a silicone material, which is also shown by circles.
  • Als silicone material comes, for example, a viscous silicone oil in question.
  • the white paper sheet 48 is soaked with the viscous silicone oil of the coupling layer 50 prior to application to the light guide plate 12 and then pressed with a roller under pressure on the frosted second major surface 16 of the light guide plate 12. Care must be taken that all the bubbles possibly present in the silicone oil of the coupling layer 50 and between the paper sheet 48 and the light guide plate 12 are pressed out by the pressure of the roller.
  • the white paper sheet 48 is fixed by the adhesion action of the silicone oil of the coupling layer 50 on the second main surface 16 of the light guide plate 12.
  • the coupling layer 50 may also be made of a viscous elastic silicone compound.
  • the paper sheet 48 can be soaked before application to the light guide plate 12 with thinner silicone oil, which was previously mixed with a hardener.
  • the silicone oil can cure after application of the paper sheet 48 to the light guide plate 12 to an elastic silicone composition, wherein the light transmittance of the silicone material is maintained.
  • the coupling layer 50 may be made of a translucent in the cured state resin, for example, an epoxy resin or a polyester resin, which is also shown by the circles.
  • reflection particles 51 are homogeneously distributed in the coupling layer 50 of silicone oil or of a resin.
  • the reflection particles 51 are indicated as points within the circles representing the silicone oil or the resin of the coupling layer 50.
  • AlS-JXIaterial for the reflection particles 51 are in particular scandium oxide or zinc sulfide into consideration.
  • oxides of lanthanum and the rare earth metals e.g. Cerium oxide, neodymium oxide, samarium oxide, europium oxide, gadolinium oxide, dysprosium oxide, holmium oxide, erbium oxide, thulium oxide, ytterbium oxide or lutetium oxide serve as the material for the reflection particles 51.
  • the coupling layer 50 Concentration in the coupling layer 50 of silicone oil or a resin, reflected light can be obtained in different intensities. Also different color effects or temperatures can be achieved by the targeted use of the above-mentioned reflection particles 51. If the coupling layer 50 is made of a resin in which reflection particles 51 are distributed, the reflection effect against the use of a coupling layer 50 made of silicone oil is increased and the proportion of the usable light, which leaves the light guide plate 12 on the first main surface 14.
  • a coupling layer 50 made of a hardened liquid resin in which the reflection particles 51 are homogeneously distributed is applied to the second main surface 16 of the light guide plate 12. Before the coupling layer 50 hardens out of resin, the paper sheet 48 is placed, which is then fixed after the curing of the resin.
  • a homogeneous mixture of resin, a hardener, and reflective particles 51 dispersed therein may be distributed on the white paper sheet 48.
  • the thus coated paper sheet 48 is then pressed with the coating of resin, hardener and reflection particles 51 onto the second main surface _-X6- of the light guide plate 12.
  • the resin / hardener mixture dissolves the acrylic glass during the curing of the coupling layer 50.
  • a surface roughness is generated on the second main surface 16 of the light guide plate 12. Therefore, a light guide plate 12 can be used without surface roughness already generated in advance, as it is more advantageous when the coupling layer 50 is formed of silicone oil.
  • a light guide plate 12 thus obtained which already carries the white paper sheet 48 and the coupling layer 50 with reflection particles 51, may for example be between 1 mm and 10 mm thick.
  • a light guide plate 12 can be obtained, which carries the white paper sheet 48 and the coupling layer 50 with reflection particles 51. Extrusion methods can be used to obtain light guide plates 12 which are between 2 m and 3 m wide and between 3 m and 10 m long.
  • the coupling layer 50 of resin between the white paper sheet 48 and the second major surface 16 of the light guide plate 12 is between 1 ⁇ m and 1000 ⁇ m, preferably between 50 ⁇ m and 250 ⁇ m, and more preferably between 100 ⁇ m and 200 ⁇ m thick.
  • the above-mentioned effect of the coupling layer 50 of silicone oil or of a resin with the reflection particle 51 also depends on the thickness of this layer, so that the desired properties can also be adapted by choosing a specific thickness thereof.
  • the white paper sheet 48 has a basis weight of from 50 g / m 2 to 200 g / m 2 , preferably from 80 g / m 2 to 170 g / m 2 , more preferably from 100 g / m 2 to 150 g / m 2, and most preferably from 120 g / m 2 .
  • a reflector substrate 48 instead of the white paper sheet, it is also possible to provide, for example, a white plastic film or a mirror film, which can be compatible with the coupling layer 50 made of silicone oil or a resin.
  • phosphor particles are in the coupling layer 50 made of silicone oil or from a resin luminescent particles, and in particular phosphorescent particles, homogeneously distributed, which are not specifically shown.
  • the illumination unit 10 can emit light even without active lighting means whose spectrum can be adjusted by an appropriate choice of the luminescent particles or a mixture of such luminescent particles.
  • An additional reflection layer 52 is provided on the side of the paper sheet 48 remote from the coupling layer 50 made of silicone oil or from a resin, which may be provided, for example, in the form of a self-adhesive mirror film or also of a white plastic film.
  • This sandwich arrangement of the reflective layer 52, the reflector substrate 48 and the coupling layer 50 made of silicone oil or a resin is covered by the housing 44, wherein the bottom 54 abuts against the reflective layer 52.
  • the housing 44, the reflector substrate 48, the coupling layer 50 with or without reflection particles 51 and the reflection layer 52 together form a reflection device 53 for the light, which leaves the light guide plate 12 on its second major surface 16.
  • foils 55 may support a reflective layer as described above so that light incident on them via the corresponding outer edge of the light guide plate 12 is reflected towards the inside of the light guide plate 12.
  • a light exit via the outer edges of the light guide plate 12 is desired, eg as a lateral reading or working light, it is possible to apply one or both foils 55 accordingly be waived.
  • FIGS. 3 and 4 show a further exemplary embodiment of a lighting unit 10 '. Components already explained with reference to FIGS. 1 and 2 bear the same reference numerals in FIGS. 3 and 4.
  • the lighting unit 10 'differs from the lighting unit 10 according to FIGS. 1 and 2 in that the light-emitting means 28 are not semiconductor light-emitting chips 28a but light-emitting tubes 28b.
  • the fluorescent tubes 28b may be formed as compact fluorescent lamps, which are also known under the terms energy-saving lamps or CFL tubes. Fluorescent lamps or cold cathode tubes are also suitable as fluorescent tubes 28b. Cold cathode tubes are also known by the term CCFL tubes.
  • CFL tubes preferably used herein may have a diameter of 5 mm to 25 mm, preferably 5 mm to 8 mm, and a length of 5 cm to 150 cm, preferably 8 cm to 40 cm.
  • CCFL tubes to be used in the illumination unit 10 ' may have a diameter of 2 mm to 6 mm, preferably 3 mm to 4 mm, and a length of 4 cm to 120 cm, preferably 8 cm to 55 cm, to have.
  • the fluorescent tubes 28b may be filled with various gases, such as neon, helium, nitrogen, carbon dioxide, krypton, argon, optionally argon with mercury, and the like, with aging resistant filler gases being preferred.
  • gases such as neon, helium, nitrogen, carbon dioxide, krypton, argon, optionally argon with mercury, and the like, with aging resistant filler gases being preferred.
  • the tubular body of the fluorescent tubes 28b may be made of glass or plastic and be flexible in the latter case.
  • a fluorescent tube 28b is shown in each housing 22 and 24, respectively, which can be acted upon by voltage via the supply lines 34 and 36.
  • two or more fluorescent tubes 28b may be disposed in each housing 22 and 24, for example, three CCFL tubes 28b, the first of which generate red light, the second green light, and the third blue light.
  • the glass or the plastic of the fluorescent tubes 28b may be colored accordingly, or the color of the light generated is adjusted via the corresponding choice of the gas filling of the fluorescent tubes 28b.
  • lighting tubes 28b may also be formed by extending in the outer edges 20 and 22 of the light guide plate 12 elongated cavities, for example krypton, e.g. Grooves, are provided, which are gas-tight to the outside by means of a mirror film, wherein for the operation of such a fluorescent tube 28b necessary electrodes protrude into these grooves. Also, a single groove is possible, which extends around the circumference of the light guide plate 12 around.
  • krypton e.g. Grooves
  • FIGS. 5 and 6 show a further exemplary embodiment of a lighting unit 10 ". Components already explained with reference to FIGS. 1 to 4 bear in FIGS and 6 the same reference numerals.
  • the illumination unit 10 '' differs from the illumination unit 10 according to FIGS. 1 and 2 in that the semiconductor light-emitting chips 28a do not laterally outwardly adjacent to the outer edges 18 and 20 of the light guide plate 12, but are arranged within a recessed from the first main surface 14 of the light guide plate 12 groove 56. Within the groove 56, the semiconductor light-emitting chips 28a are also surrounded by silicone material 30 and homogeneously distributed phosphor particles 32 therein. If the silicone material is relatively liquid silicone oil 30, a cover 58 may be provided for the groove 56, which is indicated in FIG. 4 by a dotted line. If the silicone material 30 is a sufficiently viscous and elastic compound, then this cover 58 can be dispensed with.
  • the groove 56 on the second main surface 16 of the light guide plate 12 proceed.
  • FIG. 7 shows a further exemplary embodiment in the form of a lighting unit 10 '' '.
  • Components already explained with reference to FIGS. 1 to 6 bear the same reference numerals in FIG.
  • two light guide plates 12a and 12b are provided in the illumination unit 10 '", which maintain a distance between the outer edge 20a of the light guide plate 12a and the outer edge 20b of the light guide plate 12b parallel to each other and in a plane are arranged.
  • the semiconductor light emitting chips 28a are provided in the space thus left and surrounded by silicone oil 30 which is added with phosphor particles 32.
  • phosphor particles 32 are also distributed in the silicone oil 50 between the light guide plates 12a, 12b and the paper sheet 48 here.
  • the semiconductor light-emitting chips 28a are each arranged such that they are arranged relative to the light guide plate 12 between the plane predetermined by the first main surface 14 and the plane predetermined by the second main surface 16 thereof ,
  • the second major surface 16 of the light guide plate 12 is roughened.
  • This surface roughness is in or below the order of the wavelength of the light reflected from the reflecting means 44, 48, 50, 52.
  • the roughness is of the order of 100 ⁇ m to 500 ⁇ m, preferably from 200 ⁇ m to 400 ⁇ m, and more preferably from 300 ⁇ m to 500 ⁇ m.
  • the silicone oil 30, which contains the semiconducting which contains the semiconducting In this way, it is ensured that the light emitted by the semiconductor luminescent chips 28a is reliably coupled into the optical waveguide plate 12.
  • Another way to adjust the color of the light emitted by the illumination unit 10, 10 ', 10' ' is to use different types of semiconductor light emitting chips 28a.
  • semiconductor light emitting chips 28a For example, predominantly semiconductor light-emitting chips 28a are installed, which emit blue light.
  • semiconductor light-emitting chips 28a are used, which emit in red and green.
  • the lighting units 10, 10 ', 10' 'and 10' '' explained above can be used as lighting means, for example for illuminating interior spaces. Not only interiors of buildings, but also interiors of ships, aircraft, motor vehicles and the like come into consideration.
  • the lighting units 10, 10 ', 10''and10''' can be accommodated in a sealed housing in a simple manner. Therefore, also comes a use in medicine, eg in medical devices, instruments or microscopes, but also as a lighting unit for operating theaters, into consideration.
  • the lighting units 10, 10 ', 1O 1' and 10 '' further 'in the medial region may as movies, television and the like can be used.
  • a stroboscope can also be equipped with the illumination units 10, 10 ', 10 "or 10"' '.
  • the light guide plate 12 when it is made of acrylic glass, it can be brought into a certain shape in a manner known per se, i. this is then no longer flat, but an arbitrarily shaped, in particular curved, light guide element.
  • the corresponding lighting unit itself can form a utility object, which can have an additional function to that of the lighting. It is conceivable, for example, to form the light guide element and thus the entire lighting unit in the form of a bathtub or shower cubicle. But also other furnishings, e.g. Chairs, tables and the like come into question.
  • the lighting units 10, 10 ', 1O 1' and 10 ''' are primarily intended as a backlight for a liquid crystal screen. This will be explained with reference to FIGS. 8 and 9, in which the lighting unit 10 is shown by way of example. As can be seen, in particular, in the section shown in FIG. 9, a liquid-crystal panel 60 having a flat viewing side 62 and a side 64 opposite thereto is provided in front of the first main surface 14 of the light guide plate 12 of the illumination unit 10. A liquid crystal panel 60 is known per se, and therefore a detailed explanation thereof will be omitted here.
  • Lighting unit 10 arranged so that the first main surface 14 of the light guide plate is parallel to the liquid crystal panel 60.
  • an optical coupling layer 66 made of a thick silicone oil or of an elastic silicone compound is provided between the first main surface 14 of the light guide plate 12 and the side 64 of the liquid crystal panel 60.
  • the silicone material is also indicated here by circles.
  • the optical coupling layer 66 made of the elastic silicone composition can be obtained by adding a hardener to a more fluid silicone oil.
  • the optical coupling layer 66 is in direct contact with the first major surface 14 of the light guide plate 12 and with the surface of the liquid crystal panel 60 on its side 62.
  • the optical coupling layer 66 may also be made of a resin, for example of an epoxy resin or a polyester resin.
  • the optical coupling layer 66 can be obtained by curing a liquid applied resin, to which a hardener was added, as it is known per se.
  • a uniform light of high intensity is emitted via the first main surface 14 of the light guide plate 12, which is transmitted via the coupling layer 66 is transferred from silicone oil or a viscous silicone composition to the liquid crystal panel 60 and this lit from its side 64 ago.
  • the illumination units 10, 10 ', 10' 'and 10' '' in comparison to known backlighting for liquid crystal panels, in which additional components, such as Lochreflektormasken, Fresnel lenses and diffusion filters are used, a good luminosity while ensuring a relatively large viewing angle of the liquid crystal panel 60, in which the image produced therewith is still clearly visible.
  • the reflection particles 51 can have, in addition to their reflective effect, also the phosphor particles 32 corresponding properties and radiation incident on them in part absorb and radiation of a different wavelength can emit.
  • the phosphor particles 32 in the silicone oil 30 can be dispensed with. Even the reflection particles 51 of scandium oxide or zinc sulfide convert this light in the wavelength range between see 160 nm and 380 nm of the semiconductor light-emitting chips 28a in white light. In this is emitted from the reflection particles 51 in all spatial directions and at least largely reflected by the reflection layer 52 in the direction of the light guide plate 12. If semiconductor light emitting chips 28a which emit blue light in the wavelength range of 450 nm to 475 nm are used, it is converted into light blue light when the reflection particles 51 are made of scandium oxide.
  • the apparent spectrum of the light exiting on the visible side 62 of the liquid crystal panel 60 can also be influenced by targeted control of the permeability of the liquid crystal cells of the liquid crystal panel 60.
  • the light blue light is more energetic than red or green light, but more difficult to perceive by the human eye. This enhances the visual impression for the viewer without sacrificing the color impression.
  • the individual pixels of the liquid crystal screen appearing in red, green and blue appear clearer than a pure white backlight.
  • the illumination units 10, 10 ', 10'' can be manufactured in many different configurations in terms of their dimensions and the number of semiconductor chips 28a or the fluorescent tubes 28b.
  • the lighting units 10, 10 ', 10' ' for example, each with seven interconnected semiconductor lighting chips 28a, an edge length of the outer edges 18, 20 of the light guide plate 12 of about 100 cm and a width of the light guide plate 12 of about 20 cm to be made.
  • the edge length of the outer edges 18, 20 of the light guide plate 12 may, for example, from 10 cm to 200 cm, and the width of the light guide plate 12 may vary, for example, from 1 cm to 20 cm.
  • the recording power of the lighting units 10, 10 ', 10 " is low when semiconductor light-emitting chips 28a are used.

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

Abstract

L'invention concerne un dispositif d'éclairage, destiné notamment au rétroéclairage d'un panneau à cristaux liquides (60), lequel comprend un élément guide de lumière (12) qui est délimité par une première surface principale (14) et une deuxième surface principale (16) espacée parallèlement à celle-ci. L'objet de l'invention comprend des moyens luminescents (28) qui sont disposés de telle sorte que la lumière émise par les moyens luminescents (28) est injectée dans l'élément guide de lumière (12). Sur le côté de la deuxième surface principale (16) de l'élément guide de lumière (12) est disposé un dispositif de réflexion (53) qui réfléchit la lumière en direction de l'intérieur de l'élément guide de lumière (12). L'invention concerne également un écran à cristaux liquides qui comprend un panneau à cristaux liquides (60) et un dispositif d'éclairage (10, 10', 10'', 10''') au moyen duquel un côté (64) du panneau à cristaux liquides (60) qui se trouve à l'opposé de son côté visible (62) peut être exposé à la lumière. Un dispositif d'éclairage (10, 10', 10'', 10''') selon l'une des revendications 1 à 23 est prévu sur l'écran à cristaux liquides.
EP07802334A 2007-05-04 2007-09-15 Dispositif d'éclairage et écran à cristaux liquides équipé d'un tel dispositif d'éclairage Withdrawn EP2145216A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE102007021519 2007-05-04
DE200710025573 DE102007025573A1 (de) 2007-05-31 2007-05-31 Flüssigkristall-Anzeigefeld
DE102007026795A DE102007026795A1 (de) 2007-05-04 2007-06-09 Beleuchtungsvorrichtung sowie Flüssigkristall-Bildschirm mit einer solchen Beleuchtungsvorrichtung
PCT/EP2007/008052 WO2008135072A1 (fr) 2007-05-04 2007-09-15 Dispositif d'éclairage et écran à cristaux liquides équipé d'un tel dispositif d'éclairage

Publications (1)

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EP (1) EP2145216A1 (fr)
CN (1) CN101688943A (fr)
TW (1) TW200844589A (fr)
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US5050946A (en) * 1990-09-27 1991-09-24 Compaq Computer Corporation Faceted light pipe
EP0544332B1 (fr) * 1991-11-28 1997-01-29 Enplas Corporation Source lumineuse plane
AU4409496A (en) * 1994-11-29 1996-06-19 Precision Lamp, Inc. Edge light for panel display
US5980054A (en) * 1996-05-09 1999-11-09 Matsushita Electric Industrial Co., Ltd. Panel-form illuminating system
TW383508B (en) * 1996-07-29 2000-03-01 Nichia Kagaku Kogyo Kk Light emitting device and display
WO2004113969A1 (fr) * 2003-06-19 2004-12-29 Yupo Corporation Corps reflechissant et source de lumiere superficielle l'utilisant
US7537372B2 (en) * 2003-12-19 2009-05-26 Hitachi Chemical Company, Ltd. Back light device and liquid crystal display device

Non-Patent Citations (1)

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Publication number Publication date
TW200844589A (en) 2008-11-16
WO2008135072A1 (fr) 2008-11-13
CN101688943A (zh) 2010-03-31

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