WO2008099982A1 - Lampe fluorescente plate et afficheur à cristaux liquides l'utilisant - Google Patents

Lampe fluorescente plate et afficheur à cristaux liquides l'utilisant Download PDF

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Publication number
WO2008099982A1
WO2008099982A1 PCT/KR2007/000837 KR2007000837W WO2008099982A1 WO 2008099982 A1 WO2008099982 A1 WO 2008099982A1 KR 2007000837 W KR2007000837 W KR 2007000837W WO 2008099982 A1 WO2008099982 A1 WO 2008099982A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluorescent lamp
barrier ribs
plasma discharge
flat fluorescent
electrode
Prior art date
Application number
PCT/KR2007/000837
Other languages
English (en)
Inventor
Hyo-Young Lee
Yong-Sang Cho
Byung-Soo Kim
Original Assignee
Lg Micron 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 Lg Micron Ltd. filed Critical Lg Micron Ltd.
Priority to PCT/KR2007/000837 priority Critical patent/WO2008099982A1/fr
Publication of WO2008099982A1 publication Critical patent/WO2008099982A1/fr

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133604—Direct backlight with lamps
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/30—Vessels; Containers
    • H01J61/305—Flat vessels or containers
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J65/00—Lamps without any electrode inside the vessel; Lamps with at least one main electrode outside the vessel
    • H01J65/04—Lamps in which a gas filling is excited to luminesce by an external electromagnetic field or by external corpuscular radiation, e.g. for indicating plasma display panels
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133613—Direct backlight characterized by the sequence of light sources

Definitions

  • the present invention relates to a flat fluorescent lamp, which makes it efficient to conduct evacuation and discharge gas injection and enables lighting over an entire surface.
  • the present invention relates to a liquid crystal display using the backlight unit to thus display an image.
  • a lamp for use in various illumination systems or displays is typically exemplified by a cold cathode fluorescent lamp (CCFL).
  • the CCFL is classified into, depending on the position where electrodes are mounted, an internal electrode lamp, in which electrodes are mounted inside a glass tube, which is hermetically filled with a discharge gas and mercury in a gaseous state, and a phosphor is provided on the inner surface of the glass tube, and an external electrode lamp, in which electrodes are mounted outside the glass tube and a phosphor is provided on the inner surface of the glass tube.
  • the external electrode lamp is advantageous because wall charges are formed on the surface of the glass tube near the electrodes in the glass tube through plasma discharge, and plasma discharge is caused at relatively low voltage using such wall charges, resulting in a low heat value and high efficiency driving. Further, because a voltage drop is very small, a plurality of external electrode lamps may be driven by a single inverter.
  • a liquid crystal display functions to control light transmission of liquid crystal cells in response to video signals to thus display an image.
  • An active matrix type LCD is favorable to a mobile video display because a switching device is formed in every liquid crystal cell.
  • a thin film transistor TFT is mainly used.
  • the LCD which is not a self-light-emitting device, requires an additional backlight unit.
  • the backlight unit of the LCD includes an edge-light type, in which light from a lamp mounted at the end thereof is converted into a flat light source using a light-guide plate to thus radiate it onto a liquid crystal display panel, and a direct-light type, in which light is radiated on a liquid crystal display panel using a plurality of lamps mounted below the liquid crystal display panel.
  • the flat fluorescent lamp includes front and rear substrates 11, 12 sealed together and having plasma discharge channels 17 therebetween, a plurality of electrodes 13 formed on the rear substrate 12, a phosphor 15 formed on barrier ribs 14 and the substrates 11, 12 in the plasma discharge channels 17, and periphery members 16 provided between the substrates 11, 12.
  • an object of the present invention is to provide a flat fluorescent lamp, which makes it efficient to conduct the evacuation and the discharge gas injection and enables lighting over an entire surface.
  • Another object of the present invention is to provide an LCD, which displays an image using the backlight unit.
  • the present invention provides a flat fluorescent lamp, including a front transparent substrate; a rear substrate, disposed to face the front transparent substrate and having plasma discharge channels therebetween; a plurality of barrier ribs, formed between the front transparent substrate and the rear substrate to divide a discharge space into the plurality of plasma discharge channels; one or more electrodes, formed on at least one of the substrates at both sides of the substrates; and grooves, respectively formed in the barrier ribs such that the distance from a first electrode is equal to the distance from a second electrode.
  • the present invention provides a flat fluorescent lamp, including a front transparent substrate; a rear substrate, disposed to face the front transparent substrate and having plasma discharge channels therebetween; a plurality of barrier ribs, formed between the front transparent substrate and the rear substrate to divide a discharge space into the plurality of plasma discharge channels; one or more electrodes, formed on at least one of the substrates at both sides of the substrates; one or more first grooves, formed in one or more of the barrier ribs at a first position spaced apart from a first electrode by a predetermined distance; and one or more second grooves, formed in one or more of the barrier ribs at a second position spaced apart from a second electrode by the predetermined distance.
  • the first groove may be formed in a left side of each of the barrier ribs.
  • the second groove may be formed in a right side of each of the barrier ribs.
  • the first groove may be formed in a left side of the barrier rib positioned at a first side of the plasma discharge channel.
  • the second groove may be formed at in right side of the barrier rib positioned at a second side of the plasma discharge channel.
  • the present invention provides an LCD, including a flat fluorescent lamp for generating light, including a front transparent substrate, a rear substrate disposed to face the front transparent substrate and having plasma discharge channels therebetween, a plurality of barrier ribs formed between the front transparent substrate and the rear substrate to divide a discharge space into the plurality of plasma discharge channels, one or more electrodes formed on at least one of the substrates at both sides of the substrates, and grooves respectively formed in the barrier ribs such that a distance from a first electrode is equal to a distance from a second electrode; and a liquid crystal display panel for modulating light from the flat fluorescent lamp in response to video data in order to display an image.
  • FIGS. 2 to 10 constructions that are substantially the same as conventional constructions are not depicted in the drawings, and a detailed description thereof is omitted.
  • a flat fluorescent lamp according to a first embodiment of the present invention includes a front substrate and a rear substrate sealed together and having plasma discharge channels 27 therebetween, barrier ribs 24 formed between the substrates, and electrodes 26a, 26b formed on the substrates at both sides of the barrier ribs 24. Further, the flat fluorescent lamp includes a phosphor and periphery members, which are not shown in the drawing.
  • the barrier rib 24 functions to partition a discharge space into a plurality of plasma discharge channels 27.
  • the plasma discharge channels 27 are filled with a discharge gas containing an inert gas and also with mercury in a gaseous state.
  • the groove 24 has a groove 25 formed at a predetermined depth therein.
  • the groove 25 acts as a resistor for discharge current occurring upon plasma discharge.
  • the barrier rib 24 is formed at the upper end, the lower end, or the middle portion of the barrier rib 24, as illustrated in FIGS. 5 to 7, in the center of the longitudinal direction of the barrier rib 24, in which the distance Ll from the first electrode 26a and the distance Ll from the second electrode 26b are equal to each other.
  • the depth d of the groove 25 formed in the barrier rib 24 be 80 D or less. This is considered to convey the benefits of forming passages for efficient gas flow between adjacent plasma discharge channels 27 and of restricting plasma movement upon plasma discharge caused by normal driving, in which alternating current not lower than a discharge initiation voltage is applied to the electrodes, in the evacuation process and the discharge gas injection process.
  • FIG. 3 illustrates a flat fluorescent lamp according to a second embodiment of the present invention.
  • first grooves 35a are formed at a first position spaced apart from a first electrode 36a by a predetermined distance L2
  • second grooves 35b are formed at a second position spaced apart from a second electrode 36b by the predetermined distance L2.
  • the barrier rib 34 functions to partition a discharge space into a plurality of plasma discharge channels 37.
  • the depth d of the grooves 35a, 35b formed in the barrier ribs 34 is preferably set to 80 D or less so as to form gas passages and to restrict plasma movement, as mentioned above.
  • FIG. 4 illustrates a flat fluorescent lamp according to a third embodiment of the present invention.
  • the flat fluorescent lamp of the present invention includes barrier ribs 44 for defining plasma discharge channels 47, and first and second grooves 45a, 45b formed in the barrier ribs 44 in a zigzag arrangement.
  • the distance L3 between the first groove 45a formed in the barrier rib 44 on the plasma discharge channel and the first electrode 46a is equal to the distance L3 between the second groove 45b formed in the barrier rib 44 under the plasma discharge channel and the second electrode 46b. Accordingly, the resistance between the first and second electrodes 46a, 46b becomes uniform in the plasma discharge path.
  • the depth d of the grooves 45a, 45b formed in the barrier ribs 44 is preferably set to
  • the electrodes may be provided in the form in which they are separated at both sides of the substrate, as in the above embodiment, or alternatively, a plurality of stripe-shaped electrodes 66a, 66b as illustrated in FIG. 8, electrodes 76a, 76b having openings 77 and separated at both sides of the substrate as illustrated in FIG. 9, or some other electrode form may be provided.
  • the barrier ribs are not additionally formed between the front transparent substrate and the rear substrate, but may be provided in a manner such that, as illustrated in FIG. 10, a front substrate or a rear substrate 84 is formed in a corrugated shape, in which a series of semi-cylinders is arranged and thus valley portions 84a between the semi-cylinders may function as the barrier ribs.
  • the reference numerals "64, 74" designate barrier ribs
  • "65a, 65b, 75a, 75b, 85a, 85b” designate grooves formed in the barrier ribs
  • "66a, 66b, 76a, 76b, 86a, 86b” designate electrodes.
  • the flat fluorescent lamp according to the present invention may be used as a light source of a non-light-emitting device, including a general illumination system or an LCD.
  • grooves are formed in barrier ribs at a symmetrical position, in which the distance from the end of a first electrode is equal to the distance from the end of a second electrode, or a plurality of grooves is formed at positions at which distances from electrodes adjacent thereto are equal to each other, thus efficiently conducting the evacuation and the discharge gas injection and realizing lighting over the entire surface.
  • FIG. 1 is a sectional view illustrating a conventional flat fluorescent lamp
  • FIG. 2 is a top plan view illustrating a flat fluorescent view according to a first embodiment of the present invention
  • FIG. 3 is a top plan view illustrating a flat fluorescent view according to a second embodiment of the present invention.
  • FIG. 4 is a top plan view illustrating a flat fluorescent view according to a third embodiment of the present invention.
  • FIGS. 5 to 7 are side views illustrating the grooves illustrated in FIGS. 2 to 4.
  • FIGS. 8 to 10 are views illustrating the modifications of the electrodes and barrier ribs according to the present invention.
  • a flat fluorescent lamp which makes it efficient to conduct evacuation and discharge gas injection and enables lighting over an entire surface because grooves are formed in barrier ribs at symmetrical positions, in which the distance from the end of a first electrode is equal to the distance from the end of a second electrode, or a plurality of grooves is formed at positions such that distances from electrodes adjacent thereto are equal to each other, may be applied to LCDs, PDPs, and general light- source devices.

Landscapes

  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Electromagnetism (AREA)
  • Planar Illumination Modules (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

Lampe fluorescente plate, rendant efficaces l'évacuation d'air et l'injection de gaz de décharge et permettant l'éclairage sur toute une surface. Cette lampe plate comprend un substrat transparent avant; un substrat arrière, face à l'autre substrat, avec des canaux de décharge de plasma entre les deux; plusieurs crêtes barrières, entre les deux substrats, pour la division d'un espace de décharge dans la pluralité de canaux de décharge; une ou plusieurs électrodes, sur au moins l'un des substrats des deux côtés des substrats; et des rainures, établies respectivement dans les crêtes barrières, pour qu'une distance depuis une première électrode soit égale à une distance depuis une seconde électrode.
PCT/KR2007/000837 2007-02-16 2007-02-16 Lampe fluorescente plate et afficheur à cristaux liquides l'utilisant WO2008099982A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2007/000837 WO2008099982A1 (fr) 2007-02-16 2007-02-16 Lampe fluorescente plate et afficheur à cristaux liquides l'utilisant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/KR2007/000837 WO2008099982A1 (fr) 2007-02-16 2007-02-16 Lampe fluorescente plate et afficheur à cristaux liquides l'utilisant

Publications (1)

Publication Number Publication Date
WO2008099982A1 true WO2008099982A1 (fr) 2008-08-21

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ID=39690200

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/KR2007/000837 WO2008099982A1 (fr) 2007-02-16 2007-02-16 Lampe fluorescente plate et afficheur à cristaux liquides l'utilisant

Country Status (1)

Country Link
WO (1) WO2008099982A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05325894A (ja) * 1992-05-22 1993-12-10 Fujitsu Ltd 面発光型放電灯およびその製造方法
JP2005142158A (ja) * 2003-11-04 2005-06-02 Samsung Electronics Co Ltd 面光源装置及びこれを有する液晶表示装置
JP2005142162A (ja) * 2003-11-08 2005-06-02 Samsung Electronics Co Ltd 面光源装置及びこれを有する表示装置
KR20060122114A (ko) * 2005-05-25 2006-11-30 삼성코닝 주식회사 휘도 기동성이 향상된 면광원 장치 및 이를 채용한백라이트 장치

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH05325894A (ja) * 1992-05-22 1993-12-10 Fujitsu Ltd 面発光型放電灯およびその製造方法
JP2005142158A (ja) * 2003-11-04 2005-06-02 Samsung Electronics Co Ltd 面光源装置及びこれを有する液晶表示装置
JP2005142162A (ja) * 2003-11-08 2005-06-02 Samsung Electronics Co Ltd 面光源装置及びこれを有する表示装置
KR20060122114A (ko) * 2005-05-25 2006-11-30 삼성코닝 주식회사 휘도 기동성이 향상된 면광원 장치 및 이를 채용한백라이트 장치

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