WO2006114748A1 - Systeme de retroeclairage - Google Patents

Systeme de retroeclairage Download PDF

Info

Publication number
WO2006114748A1
WO2006114748A1 PCT/IB2006/051250 IB2006051250W WO2006114748A1 WO 2006114748 A1 WO2006114748 A1 WO 2006114748A1 IB 2006051250 W IB2006051250 W IB 2006051250W WO 2006114748 A1 WO2006114748 A1 WO 2006114748A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
low
pressure mercury
mercury vapor
vapor discharge
Prior art date
Application number
PCT/IB2006/051250
Other languages
English (en)
Inventor
Marco Van As
Jean P. Jacobs
Peter A. Duine
Jan P. Dekker
Original Assignee
Koninklijke Philips Electronics N.V.
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 Koninklijke Philips Electronics N.V. filed Critical Koninklijke Philips Electronics N.V.
Publication of WO2006114748A1 publication Critical patent/WO2006114748A1/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
    • G02B6/0066—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
    • 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
    • G02B6/007—Incandescent lamp or gas discharge lamp
    • G02B6/0071—Incandescent lamp or gas discharge lamp with elongated shape, e.g. tube
    • 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
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • the invention relates to a backlighting system for illuminating a display device comprising a low-pressure mercury vapor discharge lamp, an optical waveguide and a plurality of light emitting diodes.
  • the invention further relates to a display system and a Liquid Crystal Display device comprising such backlighting system.
  • Backlighting units typically comprise low-pressure mercury vapor discharge lamps for providing a uniform illumination of a display device.
  • the low-pressure mercury vapor discharge lamps comprise a discharge vessel in which an inner wall of the discharge vessel is provided with a luminescent layer comprising a luminescent material.
  • the luminescent material comprises a mix of different phosphors. Typically, a mix of three different phosphors is used in which each one of the different phosphors is associated with a primary color. The mix of different phosphors inside the low-pressure mercury vapor discharge lamp determines the color of the low-pressure mercury vapor discharge lamp and thus the color of the backlighting system.
  • the color gamut which can be displayed by the LCD is determined by a combination of the mix of phosphors used in the low-pressure mercury vapor discharge lamp and the transmission characteristics of the color filters used in the LCD.
  • a display system in which a backlighting system comprising currently commercially available phosphors in the low-pressure mercury vapor discharge lamp is combined with an LCD comprising currently commercially available color filters typically can display a color gamut which does not fully cover the color gamut defined in, for example, the European Broadcasting Union (EBU) color standard.
  • EBU European Broadcasting Union
  • Alternative backlighting units comprise a plurality of Light Emitting Diodes (further also referred to as LED) which provide a uniform illumination to the display device.
  • the plurality of LEDs comprises different colors to provide the complete color gamut.
  • the use of LEDs provides more freedom in choosing a combination of colors of the LEDs such that the backlighting unit together with an LCD provides a display system which is able to cover substantially the full standardized EBU color gamut.
  • a drawback in using a plurality of LEDs as light sources in a backlighting unit is that LEDs have a low luminous efficacy, which results in a relatively high power consumption.
  • a further drawback is that the current market price of LEDs is much higher than that of low-pressure mercury vapor discharge lamps, and thus a solution in which the backlighting unit comprises a plurality of LEDs as the light sources would result in a relatively expensive backlighting system.
  • Another drawback in using a plurality of LEDs as the light sources is that the backlighting unit comprising LEDs requires an additional thickness for achieving a good color mixing of the individual LEDs and thus for providing a uniformly illuminated display.
  • Japanese patent application JP 2003/140110 discloses a backlighting unit in which a plurality of cold-cathode fluorescent lamps is combined with an array of LEDs.
  • the array of LEDs is arranged adjacent to the cold-cathode fluorescent lamps.
  • the disclosed combination of cold-cathode fluorescent lamps with an array of LEDs improves the color gamut of the backlighting unit and reduces the power consumption without lowering the lumen output.
  • the arrangement of the array of LEDs does not provide a sufficiently uniform distribution of the light from the LEDs over an output window of the backlighting unit.
  • the object is achieved with a backlighting system for illuminating a display device via a light exit window, the backlighting system comprising: a low-pressure mercury vapor discharge lamp arranged for achieving a direct incidence of light emitted by the low-pressure mercury vapor discharge lamp on the display device via the light exit window; an optical waveguide comprising: a first wall facing the light exit window; a second wall situated opposite said first wall; edge surfaces extending between the first wall and the second wall; a light ingress window arranged at a particular edge surface; a light egress window provided at the first wall; and light out-coupling elements for coupling out light via the light egress window towards the light exit window; and - a plurality of light emitting diodes arranged at the
  • the effect of the measures according to the invention is that the use of the optical waveguide enables light emitted by the plurality of LEDs to be mixed before the light is emitted via the light exit window towards the display device. Possible variations in light output of different LEDs will be mixed inside the optical waveguide and will not influence the uniformity of the light output. Furthermore, differently colored LEDs may be used in the backlighting system, in which the different colors of the LEDs are mixed inside the optical waveguide before being emitted towards the display device.
  • the invention is also based on the recognition that LEDs typically produce a considerable heat which must be removed.
  • the array of LEDs is arranged adjacent to the low-pressure mercury vapor discharge lamps. This adjacent arrangement of the LEDs reduces an efficiency of the cooling of the LEDs.
  • arrangements for achieving a forced cooling in the known backlighting unit for example cooling fins and fans, may be spread across the entire rear side of the backlighting unit, making them rather inefficient, expensive, and bulky.
  • the arrangement in the known backlighting unit either results in a large cooling area for cooling the array of LEDs at the back of the backlighting unit, which typically is expensive, or results in the use of low-power LEDs in the array of LEDs, which typically generate less heat but also less light.
  • the optical waveguide is used for mixing the light emitted by the LEDs.
  • the LEDs are typically arranged at a particular edge of the backlighting system, which makes for a more efficient and cost-effective cooling.
  • the improved cooling facilitates the use of high-power LEDs, which typically increases the light output of the backlighting system or reduces the number of LEDs to be applied in the backlighting system.
  • a further benefit of the backlighting system according to the invention is that the arrangement of the LEDs at a particular edge of the backlighting system typically reduces the thickness of the backlighting system.
  • the low-pressure mercury vapor discharge lamp is arranged between the optical waveguide and the light exit window.
  • the benefit of this embodiment is that the low-pressure mercury vapor discharge lamp can be used as an additional light mixing chamber for the light emitted by the optical waveguide. This enables the optical waveguide to be reduced in thickness, because part of the light mixing is done via the low-pressure mercury vapor discharge lamp.
  • the light out-coupling elements are provided at predetermined locations in the vicinity of the low-pressure mercury vapor discharge lamp, substantially preventing direct incidence of light emitted by the light out-coupling elements on the light exit window.
  • the benefit of this embodiment is that substantially all light from the optical waveguide is mixed via the low-pressure mercury vapor discharge lamp before being emitted from the backlighting system. This arrangement prevents local intensity variations caused by direct incidence of light at the light exit window from the optical waveguide.
  • the low-pressure mercury vapor discharge lamp comprises a discharge vessel, a wall of the discharge vessel being provided with a luminescent layer comprising a luminescent material, and the wall of the discharge vessel further comprising a diffuser coating, while the light emitted by the light out-coupling elements is coupled into the discharge vessel via an aperture in the diffuser coating.
  • the aperture enables light emitted by the optical waveguide to be coupled into the discharge vessel of the low-pressure mercury vapor discharge lamp and to be mixed inside the discharge vessel before it is emitted via the light exit window of the backlighting system.
  • the optical waveguide is arranged between the low-pressure mercury vapor discharge lamp and the light exit window.
  • the benefit of this embodiment is that light emitted by the low-pressure mercury vapor discharge lamp is mixed inside the optical waveguide before it is emitted towards the display device.
  • the backlighting system comprises a plurality of low-pressure mercury vapor discharge lamps which are used in a scanning mode during operation, while the plurality of light emitting diodes are used in a continuous mode during operation.
  • a driving circuit necessary for driving the low-pressure mercury vapor discharge lamps in a scanning mode of operation is typically different from a driving circuit for driving the plurality of LEDs in a scanning mode of operation.
  • Driving of the plurality of LEDs in a continuous mode of operation means that the driving circuit for driving the plurality of LEDs in a scanning mode can be simplified due to the omission of a scanning part of the driving electronics.
  • the benefit of this embodiment is that the simplification of the driving electronics for the plurality of LEDs reduces the cost of the backlighting system.
  • This embodiment is especially beneficial when the plurality of LEDs contribute the primary color red to the backlighting system. Since the sensitivity of the human eye to the primary color red is relatively low, the impact on the reproduction of motion on an LCD when the LEDs are driven in a continuous mode of operation is expected to be relatively low.
  • the low-pressure mercury vapor discharge lamp comprises luminescent material which comprises Europium-activated Barium Aluminate (further also referred to as BAL).
  • BAL Europium-activated Barium Aluminate
  • BAM Europium-activated Barium Magnesium Aluminate
  • EBU European Broadcasting Union
  • a benefit when using BAL in a low- pressure mercury vapor discharge lamp of the backlight system of an LCD device is that the combination of the light emitted by the BAL together with the color filters enable an improved color saturation of the LCD device which results in an improved color gamut which can be displayed by the LCD device having an improved coverage of the EBU color standard.
  • the low-pressure mercury vapor discharge lamp comprises luminescent material which comprises Europium-activated Yttrium Oxysulfide (further also referred to as YOS).
  • YOS Europium-activated Yttrium Oxysulfide
  • YOX Europium-activated Yttrium Oxide
  • EBU European Broadcasting Union
  • a benefit when using YOS in a low- pressure mercury vapor discharge lamp of the backlight system of an LCD device is that the combination of the light emitted by the YOS together with the color filters enable an improved color saturation of the LCD device which results in an improved color gamut which can be displayed by the LCD device having an improved coverage of the EBU color standard.
  • the low-pressure mercury vapor discharge lamp is a Hot Cathode Fluorescent Lamp (further also referred to as HCFL).
  • HCFL Hot Cathode Fluorescent Lamp
  • An HCFL can be switched on and off quickly, which is especially beneficial when the low-pressure mercury vapor discharge lamp is used a scanning mode of operation.
  • the low-pressure mercury vapor discharge lamp comprises a first luminescent material that is associated with a first primary color and a second luminescent material that is associated with a second primary color, while the plurality of light emitting diodes provide a third primary color, i.e. a primary color red.
  • commercially available low-pressure mercury vapor discharge lamps typically comprise a third luminescent material associated with a third primary color, i.e. red.
  • the conversion of ultraviolet light from the mercury vapor discharge into light of the primary color red is relatively inefficient in commercially available third luminescent materials. Because of this relatively inefficient conversion, a relatively large percentage of the third luminescent material is necessary in commercially available low-pressure mercury vapor discharge lamps compared with the first and second luminescent material if a good color gamut is to be provided.
  • Another drawback of the relatively inefficient conversion in commercially available third luminescent material is that the relatively inefficient conversion results in an additional heat generation, which may require additional cooling arrangements inside the backlighting system. The efficiency of the backlighting system is improved, and additional cooling arrangements can be omitted in that no third luminescent material is present in the low-pressure mercury vapor discharge lamp and LEDs are added to the backlighting system for providing the third primary color red.
  • Fig. 1 shows a backlighting system according to the invention in which LEDs emit light into an optical waveguide which distributes the light from the LEDs across the light output window
  • Fig. 2 shows a backlighting system according to the invention in which light out-coupling elements of the optical waveguide emit light towards the low-pressure mercury vapor discharge lamp
  • Fig. 3 shows a display device.
  • Fig. 1 shows a backlighting system Bl, B2 according to the invention in which LEDs Ll emit light into an optical waveguide LG.
  • the optical waveguide LG comprises a first wall F which faces the light exit window EW of the backlighting system Bl, B2 and comprises a second wall S situated opposite the first wall F at a panel thickness distance. Edge surfaces extend between the first wall F and the second wall S of the optical waveguide LG. At least one of the edge surfaces of the optical waveguide LG comprises a light ingress window LIl via which the light emitted by the LEDs Ll is admitted into the optical waveguide LG.
  • the first wall F of the optical waveguide LG comprises a light egress window LE via which the light is emitted towards the light exit window EW of the backlighting system Bl, B2.
  • the optical waveguide LG further comprises an arrangement of light out-coupling elements OCl which provide a distribution of the light emitted by the optical waveguide LG.
  • the backlighting system Bl, B2 comprises low-pressure mercury vapor discharge lamps TLl which each comprise a discharge vessel V having a luminescent layer P typically arranged at an inner wall of the discharge vessel V and a diffuser coating Cl typically arranged at an outer wall of the discharge vessel V.
  • the discharge vessel V further comprises a low-pressure mercury vapor environment (not shown).
  • a discharge generated in the low-pressure mercury vapor environment causes the mercury vapor inside the discharge vessel V to emit ultraviolet light (not shown).
  • the ultraviolet light is absorbed by the luminescent layer P and converted into visible light of a predefined color.
  • the luminescent layer P comprises a first luminescent material which is associated with a first primary color. Ultraviolet light which illuminates the first luminescent material is converted into the first primary color, for example the primary color blue, which is emitted by the low-pressure mercury vapor discharge lamp TLl.
  • the luminescent layer P further comprises a second luminescent material which is associated with a second primary color.
  • the backlighting system Bl, B2 further comprises a plurality of LEDs Ll which emit light of a third primary color, for example the primary color red.
  • the plurality of LEDs Ll shown in Fig. 1 emit light substantially towards the light ingress window LIl of the optical waveguide LG.
  • the optical waveguide LG mixes the light emitted by the plurality of LEDs Ll and emits light towards the light exit window EW.
  • the distribution of the light emitted by the optical waveguide LG depends on the predetermined distribution of the light out-coupling elements OCl.
  • a specific uniformity distribution can be created by means of the predetermined arrangement of light out-coupling elements OCl.
  • the specific distribution may, for example, take the location of the low-pressure mercury vapor discharge lamp TLl within the backlighting system Bl into consideration and provide a uniform distributed light output in conjunction with the low- pressure mercury vapor discharge lamp Bl.
  • the combination of the first, second, and third primary colors enables the backlighting system Bl, B2 to provide a full color gamut to the display device Di, for example substantially covering the full EBU color standard.
  • Fig. IA is a cross-sectional view of the backlighting system Bl in which the low-pressure mercury vapor discharge lamps TLl are arranged between the optical waveguide LG and the light exit window EW.
  • the light emitted by the optical waveguide LG is partly mixed inside the discharge vessel V of the low-pressure mercury vapor discharge lamps TLl before it is emitted towards the display device Di.
  • the lateral distance between every two low-pressure mercury vapor discharge lamps TLl is reduced such that substantially all light emitted by the optical waveguide is mixed inside the discharge vessels V of the low-pressure mercury vapor discharge lamps TLl.
  • This additional mixing of light inside the discharge vessels V of the low-pressure mercury vapor discharge lamps TLl means that less light mixing is necessary inside the optical waveguide LG, and the thickness of the optical waveguide LG can be reduced accordingly.
  • Fig. IB is a cross-sectional view of the backlighting system B2 in which the optical waveguide LG is arranged between the low-pressure mercury vapor discharge lamps TLl and the light exit window EW.
  • the light emitted by the low-pressure mercury vapor discharge lamps TLl is emitted towards the display device Di via the optical waveguide LG.
  • the optical waveguide LG is used as an additional light-mixing chamber for the light emitted by the low-pressure mercury vapor discharge lamps TLl.
  • Fig. 2 shows a backlighting system B3, B4 according to the invention in which light out-coupling elements OC2, OC3, OC4 of the optical waveguide LG emit light substantially towards the low-pressure mercury vapor discharge lamps TLl, TL2, TL3.
  • the low-pressure mercury vapor discharge lamps TLl, TL2, TL3 are arranged between the optical waveguide LG and the light exit window EW.
  • the optical waveguide LG comprises an arrangement of light out-coupling elements OC2, OC3, OC4 which emit light locally towards the display device Di via the discharge vessels V of the low-pressure mercury vapor discharge lamps TLl, TL2, TL3.
  • Fig. 2A is a cross-sectional view of a backlighting system B3 which comprises different low-pressure mercury vapor discharge lamps TL2, TL3.
  • the discharge vessel V comprises a luminescent layer P typically arranged at the inner wall of the discharge vessel V and a diffuser coating C2, C3 typically arranged at the outer wall of the discharge vessel V.
  • the luminescent layer P comprises the first and second luminescent materials, which are associated with the first and second primary colors, respectively, for example the primary colors blue and green.
  • the diffuser coatings C2, C3 comprise apertures A2, A3 for admitting the light emitted by the optical waveguide LG into the discharge vessels V of the low- pressure mercury vapor discharge lamps TL2, TL3.
  • the aperture A2 is a longitudinal aperture A2 arranged at a side of the low-pressure mercury vapor discharge lamp TL2 facing away from the display device Di.
  • a plurality of circular apertures A3 are arranged at a side of the low-pressure mercury vapor discharge lamp TL3 facing away from the display device Di.
  • the aperture Al, A3 still comprises luminescent material P for preventing UV light from being emitted via the aperture Al, A3 into the backlighting system B3.
  • the optical waveguide LG of the backlighting system B3 comprises different light out-coupling elements OC2, OC3, OC4 in the vicinity of the apertures A2, A3 of the low-pressure mercury vapor discharge lamps TL2, TL3.
  • the emission pattern of the light out-coupling elements OC2, OC3, OC4 is chosen such that the light emitted by the light out-coupling elements OC2, OC3, OC4 is admitted to the discharge vessel V of the low-pressure mercury vapor discharge lamps TL2, TL3 via the apertures A2, A3.
  • the light out-coupling elements OC2 are arranged in a substantially continuous line parallel to the longitudinal aperture A2 of the low- pressure mercury vapor discharge lamp TL2.
  • the light out-coupling elements OC3 are arranged in an array of separate out-coupling elements OC3 parallel to the longitudinal aperture A2 of the low-pressure mercury vapor discharge lamp TL2.
  • the light out-coupling elements OC4 are arranged in an array of separate light out-coupling elements OC4, wherein the distribution of the light out-coupling elements OC4 at the optical waveguide LG coincides with the distribution of the plurality of circular apertures A3 at the low-pressure mercury vapor discharge lamp TL3.
  • the light emitted by the plurality of LEDs Ll is mixed inside the optical waveguide LG and emitted via light out-coupling elements OC2, OC3, OC4.
  • the light emitted by the optical waveguide LG is admitted into the discharge vessel V of the low-pressure mercury vapor discharge lamp TL2, TL3.
  • the discharge vessel V of the low-pressure mercury vapor discharge lamp TL2, TL3 constitutes an additional light-mixing chamber for the light emitted by the optical waveguide LG, which improves the uniformity of the light emitted by the backlighting system B3.
  • Fig. 2C is a cross-sectional view of a backlighting system B4 which comprises the low-pressure mercury vapor discharge lamps TLl without an aperture, for example identical to the low-pressure mercury vapor discharge lamps TLl shown in Fig. 1.
  • Fig. 2D shows the backlighting system B4 viewed through the display device Di.
  • the optical waveguide LG again comprises different arrangements of light out-coupling elements OC2, OC3, OC4, as shown in Figs. 2A and 2B.
  • the diffuser coating Cl of the low-pressure mercury vapor discharge lamp TLl does not comprise an aperture for admitting the light from the optical waveguide LG into the discharge vessel V.
  • the light emitted by the optical waveguide LG impinges on the diffuser coating Cl of the discharge vessel V and is admitted to the discharge vessel V via the diffuser coating Cl.
  • the discharge vessel is again used as light-mixing chamber for the light emitted by the optical waveguide LG.
  • the diffuser coating Cl acts as an additional diffusing layer for the light from the optical waveguide LG before this light is mixed inside the discharge vessel V.
  • the plurality of LEDs comprises side emitting LEDs L2.
  • the side emitting LEDs L2 predominantly emit light in a direction parallel to the light exit window EW.
  • each side emitting LED L2 is accommodated in a hollow space within the optical waveguide LG.
  • the light ingress window LI2 in this embodiment is constituted by the hollow space, typically fully surrounding each side emitting LED L2.
  • Fig. 3 shows a display system Ds, for example a Liquid Crystal Display system comprising the backlighting system Bl, B2, B3, B4 according to the invention.
  • the backlight system Bl, B2, B3, B4 comprises a low-pressure mercury vapor discharge lamp TLl, TL2, TL3, having luminescent material comprising Europium-activated Barium Aluminate (BAL) and/or comprising Europium-activated Yttrium Oxysulfide (YOS).
  • BAL Europium-activated Barium Aluminate
  • YOS Europium-activated Yttrium Oxysulfide
  • a benefit when using BAL and/or YOS in a low-pressure mercury vapor discharge lamp TLl, TL2, TL3, applied in a backlight system Bl, B2, B3, B4, of a Liquid Crystal Display device is that the combination of the light emitted by the BAL and/or the light emitted by the YOS together with the typical color filters of the Liquid Crystal Display device provide an improved color saturation of the Liquid Crystal Display device compared to the conventional luminescent materials used in low-pressure mercury vapor discharge lamps TLl, TL2, TL3.
  • the use of BAL and/or YOS typically results in an improved coverage of the EBU color standard by the Liquid Crystal Display device.
  • Light out-coupling elements OCl, OC2, OC3, OC4 are, for example, optical elements like lenses, diffusers, or prisms.
  • the light out-coupling elements OCl, OC2, OC3, OC4 are, for example, scratches or deformations at the light egress window LE of the optical waveguide LG.
  • the light out-coupling elements OCl, OC2, OC3, OC4 are, for example, reflective elements arranged at the second wall S of the optical waveguide LG.
  • any reference signs placed between parentheses shall not be construed as limiting the claim.
  • the use of the verb "comprise” and its conjugations does not exclude the presence of elements or steps other than those stated in a claim.
  • the article “a” or “an” preceding an element does not exclude the presence of a plurality of such elements.
  • several of these means may be embodied by one and the same item of hardware.
  • the mere fact that certain measures are recited in mutually different dependent claims does not indicate that a combination of these measures cannot be used to advantage.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Planar Illumination Modules (AREA)

Abstract

La présente invention concerne un système de rétroéclairage (B1) qui combine une lampe à décharge de vapeur de mercure basse pression (TL1) à une pluralité de diodes électroluminescentes (DEL) (L1) par le biais d'un guide d'onde optique (LG). La lumière émise par les diodes électroluminescentes est mélangée à l'intérieur du guide d'onde optique. Dans un premier mode de réalisation, la lampe à décharge de vapeur de mercure basse pression est disposée entre le guide d'onde optique et la fenêtre de sortie de lumière (EW). Dans un deuxième mode de réalisation, le guide d'onde optique est disposé entre la lampe à décharge de vapeur de mercure basse pression et la fenêtre de sortie de lumière. Dans un autre mode de réalisation préféré, le guide d'onde optique comprend un agencement d'éléments de couplage de sortie de lumière (OC2, OC3, OC4) qui réalisent le couplage de sortie de la lumière mélangée sortant du guide d'onde optique en direction de la fenêtre de sortie de lumière par le biais de la lampe à décharge de vapeur de mercure basse pression. Dans un autre mode de réalisation préféré, la lampe à décharge de vapeur de mercure basse pression comprend des ouvertures dans un revêtement diffuseur qui permettent d'admettre la lumière émise par le guide d'onde optique dans un récipient de décharge (V) de la lampe à décharge de vapeur de mercure basse pression, ce qui entraîne un mélange supplémentaire de la lumière émise par le guide d'onde optique à l'intérieur du récipient de décharge. La lampe à décharge de vapeur de mercure basse pression génère habituellement une première et une deuxième couleur primaire, tandis que les diodes électroluminescentes génèrent habituellement une troisième couleur primaire de sorte que la combinaison des trois couleurs primaires améliore la conformité avec la norme EBU.
PCT/IB2006/051250 2005-04-27 2006-04-21 Systeme de retroeclairage WO2006114748A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
EP05103456 2005-04-27
EP05103456.9 2005-04-27
EP05109466 2005-10-12
EP05109466.2 2005-10-12

Publications (1)

Publication Number Publication Date
WO2006114748A1 true WO2006114748A1 (fr) 2006-11-02

Family

ID=36649118

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/IB2006/051250 WO2006114748A1 (fr) 2005-04-27 2006-04-21 Systeme de retroeclairage

Country Status (1)

Country Link
WO (1) WO2006114748A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008132915A1 (fr) * 2007-04-18 2008-11-06 Sharp Kabushiki Kaisha Dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides
EP2485073A3 (fr) * 2011-01-27 2014-01-15 Zumtobel Lighting GmbH Lampe dotée d'un dépôt de lumière diffusé et en faisceau

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29620583U1 (de) * 1996-11-27 1997-02-13 Kundisch Microtech GmbH & Co. KG, 78056 Villingen-Schwenningen Beleuchtungskörper mit stufenlos einstellbarer Farbänderung des Lichtes und des Lichtkegels
US20020126478A1 (en) * 2001-02-19 2002-09-12 Cornelissen Hugo Johan Illumination system and display device
JP2003140110A (ja) * 2001-08-20 2003-05-14 Hitachi Ltd 液晶表示装置とその駆動回路
US20040201978A1 (en) * 2003-04-11 2004-10-14 Kuo Heng Sheng Light source structure
WO2005024478A1 (fr) * 2003-09-11 2005-03-17 Philips Intellectual Property & Standards Gmbh Systeme de lampe
EP1555477A1 (fr) * 2004-01-15 2005-07-20 Zumtobel Staff GmbH Luminaire comprenant des sources lumineuses de différentes couleurs ainsi qu'un guide de lumière plan pour émettre un mélange de lumières

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE29620583U1 (de) * 1996-11-27 1997-02-13 Kundisch Microtech GmbH & Co. KG, 78056 Villingen-Schwenningen Beleuchtungskörper mit stufenlos einstellbarer Farbänderung des Lichtes und des Lichtkegels
US20020126478A1 (en) * 2001-02-19 2002-09-12 Cornelissen Hugo Johan Illumination system and display device
JP2003140110A (ja) * 2001-08-20 2003-05-14 Hitachi Ltd 液晶表示装置とその駆動回路
US20040201978A1 (en) * 2003-04-11 2004-10-14 Kuo Heng Sheng Light source structure
WO2005024478A1 (fr) * 2003-09-11 2005-03-17 Philips Intellectual Property & Standards Gmbh Systeme de lampe
EP1555477A1 (fr) * 2004-01-15 2005-07-20 Zumtobel Staff GmbH Luminaire comprenant des sources lumineuses de différentes couleurs ainsi qu'un guide de lumière plan pour émettre un mélange de lumières

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 09 3 September 2003 (2003-09-03) *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008132915A1 (fr) * 2007-04-18 2008-11-06 Sharp Kabushiki Kaisha Dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides
EP2485073A3 (fr) * 2011-01-27 2014-01-15 Zumtobel Lighting GmbH Lampe dotée d'un dépôt de lumière diffusé et en faisceau

Similar Documents

Publication Publication Date Title
US7213960B2 (en) Backlight unit assembly using light emitting diode array in liquid crystal display device
US7284890B2 (en) Backlight device of liquid crystal display device and method of fabricating the same
US6050704A (en) Liquid crystal device including backlight lamps having different spectral characteristics for adjusting display color and method of adjusting display color
WO2006114743A2 (fr) Systeme de retroeclairage et systeme d'affichage
US20060164858A1 (en) Backlight assembly and display apparatus having the same
JP2004526290A (ja) 照明系およびディスプレイデバイス
CA2396019A1 (fr) Source lumineuse planaire a base de diodes electroluminescentes
US7810979B2 (en) Illuminating device with primary color LED and fluorescent light sources, and liquid crystal display device
JP2010506371A (ja) 薄型イルミネーションデバイス、ディスプレイデバイス及び照明デバイス
KR20070012226A (ko) 광원 장치 및 액정 표시장치
WO2011102185A1 (fr) Source optique, dispositif d'éclairage, écran et téléviseur
JP2006236701A (ja) バックライト装置及び液晶表示装置
US20090097240A1 (en) Spread illuminating apparatus
KR20060083136A (ko) 백 라이트 장치 및 액정 표시 장치
KR101763188B1 (ko) 액정표시장치
KR101758719B1 (ko) 액정표시장치
US7465073B2 (en) Backlight unit and liquid crystal display device having the same
JP2007095624A (ja) バックライトシステム及び液晶表示装置
US7591563B2 (en) Backlight device for display system providing enhanced peripheral illumination
WO2006114748A1 (fr) Systeme de retroeclairage
WO2006114750A1 (fr) Systeme de retroeclairage
KR100546705B1 (ko) 액정표시장치의 백라이트 유닛
WO2006114740A2 (fr) Systeme de retroeclairage a balayage
KR20040057270A (ko) 액정표시장치의 백라이트 유닛
KR101018940B1 (ko) 빛샘이 방지된 램프 어셈블리 및 이를 채용한 액정표시장치

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: 06728009

Country of ref document: EP

Kind code of ref document: A1