WO2008038670A1 - Lampe fluorescente clignotante, dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides - Google Patents

Lampe fluorescente clignotante, dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides Download PDF

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Publication number
WO2008038670A1
WO2008038670A1 PCT/JP2007/068695 JP2007068695W WO2008038670A1 WO 2008038670 A1 WO2008038670 A1 WO 2008038670A1 JP 2007068695 W JP2007068695 W JP 2007068695W WO 2008038670 A1 WO2008038670 A1 WO 2008038670A1
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WO
WIPO (PCT)
Prior art keywords
phosphor
fluorescent lamp
liquid crystal
lighting
backlight device
Prior art date
Application number
PCT/JP2007/068695
Other languages
English (en)
Japanese (ja)
Inventor
Tatsuya Ikeda
Naoki Tsutsui
Tomohiro Mizoguchi
Masahiko Tamai
Original Assignee
Harison Toshiba Lighting Corporation
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 Harison Toshiba Lighting Corporation filed Critical Harison Toshiba Lighting Corporation
Priority to JP2008536397A priority Critical patent/JPWO2008038670A1/ja
Publication of WO2008038670A1 publication Critical patent/WO2008038670A1/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7783—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals one of which being europium
    • C09K11/7784—Chalcogenides
    • C09K11/7787—Oxides
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7728—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing europium
    • C09K11/7734—Aluminates
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
    • C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
    • C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
    • C09K11/7766—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals containing two or more rare earth metals
    • C09K11/7767—Chalcogenides
    • C09K11/7769—Oxides
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/38—Devices for influencing the colour or wavelength of the light
    • H01J61/42—Devices for influencing the colour or wavelength of the light by transforming the wavelength of the light by luminescence
    • H01J61/44—Devices characterised by the luminescent material
    • 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

Definitions

  • Fluorescent lamp for flashing backlight device, and liquid crystal display device
  • the present invention relates to a fluorescent lamp, a backlight device, and a liquid crystal display device used for blinking lighting.
  • the blinking lighting method includes a blinking lighting method that lights up in accordance with the on / off timing of a plurality of arranged lamps, a scanning lighting method that lights up while sequentially scrolling by shifting the lamp on / off timing, etc. Is generally known. In any of the methods, there is an advantage that motion blur caused when displaying a moving image can be prevented by combining with driving of a liquid crystal.
  • An object of the present invention is to provide a fluorescent lamp for blinking lighting, a backlight device, and a liquid crystal display device in which an afterimage hardly remains.
  • the flashing lighting fluorescent lamp of the present invention has a multi-wavelength phosphor composed of a plurality of types of phosphors having a 1/10 afterglow time of 5 msec or less on the inner surface of a glass container. It is formed!
  • the phosphor has a 90% emission rising force S and a time force S5 msec or less.
  • the phosphor includes an activator selected from Sn2 +, Pr3 +, ⁇ u2 +, Eu3 +, Ce3 +, and Tb3 +. is there.
  • the phosphor is a multi-wavelength phosphor including red, green, and blue phosphors
  • the red phosphor is Sn2 +, Pr3 +, EU2 +, EU3 +, green Phosphors include Eu2 +, Ce3 +, Tb3 +, and blue phosphors include an activator selected from Eu2 +! /.
  • the backlight device of the present invention includes a housing, the fluorescent lamp housed in the housing, and a lighting circuit capable of blinking and lighting the fluorescent lamp. It is.
  • a liquid crystal display device of the present invention includes the above-described backlight device and a liquid crystal panel disposed on the light emitting surface side of the backlight device.
  • FIG. 1 is a diagram for explaining a backlight device according to a first embodiment (embodiment) of the present invention.
  • FIG. 2 is a diagram for explaining a cross section of the fluorescent lamp shown in FIG.
  • FIG. 3 is a diagram for explaining the light emission characteristics of a fluorescent lamp coated with a Y203: Eu3 + phosphor.
  • FIG. 4 A diagram for explaining the presence or absence of afterimages when moving images on a liquid crystal are projected by fluorescent lamps with different response speeds.
  • FIG. 5 Example (a diagram for explaining the light emission characteristics when the lamp of Example ⁇ blinks by blinking lighting).
  • FIG. 6 is a diagram for explaining the light emission characteristics when the lamp of Comparative Example l is blinking and blinking.
  • FIG. 7 is a diagram for explaining a difference between Example 1 and Comparative Example 1.
  • FIG. 8 A diagram for explaining the response speed of a fluorescent lamp when various phosphors are used.
  • FIG. 9 is a diagram for explaining the response speed of a fluorescent lamp when the phosphors of FIG. 8 are combined.
  • FIG. 10 is a diagram for explaining a backlight device according to a second embodiment of the present invention.
  • FIG. 11 is a diagram for explaining a liquid crystal display device according to a third embodiment of the present invention.
  • FIG. 12 is a diagram for explaining light emission obtained by the liquid crystal display device of the present invention.
  • FIG. 1 is a diagram for explaining a backlight device according to a first embodiment of the present invention.
  • the backlight device BL of the present embodiment is a direct type.
  • the casing of the knocklight BL is composed of a front frame la and a back frame lb.
  • An opening surface is formed in the front frame 1a.
  • the back frame lb has a bottomed opening shape, and a highly reflective reflecting surface is formed on the inner side.
  • a plurality of elongated fluorescent lamps 2 are arranged inside the knock frame lb so that their tube axes are substantially parallel to each other.
  • the cold cathode fluorescent lamp a hot cathode fluorescent lamp, an external electrode fluorescent lamp, a flat fluorescent lamp or the like may be used, and there is no limitation on the type, shape, size, and the like.
  • FIG. 1 A specific structure of the fluorescent lamp 2 is shown in FIG.
  • the main part of the fluorescent lamp 2 is composed of a glass container 21 made of, for example, soft glass, and a mixed gas composed of Ne and Ar and mercury are enclosed therein. Electrode mounts 22 a and 22 b are sealed at both ends of the glass container 21.
  • the electrode mounts 22a and 22b are composed of electrodes 22al and 22bl and bead glasses 22a2 and 22b2.
  • FIG. 3 is a diagram for explaining the light emission characteristics of a fluorescent lamp coated with a Y203: Eu3 + phosphor.
  • the horizontal axis represents time, and the vertical axis represents voltage or current value.
  • Waveform (A) in the figure is an on / off signal that is a voltage waveform for on / off control of the fluorescent lamp, waveform (B) is the lamp voltage waveform, waveform (C) is the lamp current waveform, waveform is the lamp emission intensity. It is an output voltage waveform obtained by photoelectric conversion with a photodiode. These waveforms are measured with an oscilloscope.
  • the fluorescent lamp 2 responds to the on / off signal waveform (A) with the lamp voltage and lamp current waveforms (B) and (C) without delay, but the lamp emission waveform (D).
  • the reaction tends to be delayed. This is a result of the response speed of the phosphor. Therefore, it is most desirable to use a phosphor whose response speed is the same as that of the on / off signal (A), but such a phosphor is difficult to realize.
  • the inventor investigated the response speed of various phosphors, and 1/10 afterglow time (when the maximum brightness is A, the time from the brightness power of the lamp to 0.1A) A three-wavelength fluorescent lamp with a lmsec to 10 msc was made. Then, a moving image on the liquid crystal was projected with the fluorescent lamp, and a test was conducted on 10 subjects to see if there was an afterimage in the moving image.
  • the results are shown in FIG. As can be seen from Fig. 4, it was found that if the 1/10 afterglow time was 5 msec or less, it was hardly visible to the human eye as an afterimage, and if it was 3 msec or less, it could hardly be recognized as an afterimage.
  • the Y203: Eu3 + phosphor shown in Fig. 3 has a 90% rise time and 1/10 afterglow time of about 2.5 msec. It is suitable as the phosphor of the present invention, which is fast. In most phosphors, it was found that the rise of light emission and the fall of light emission are correlated. For example, the phosphor in Fig.
  • a diffusion plate 3 is arranged on the opening side of the back frame lb. Diffusion plate
  • an optical sheet 4 is disposed!
  • the optical sheet 4 one sheet or a plurality of sheets such as a diffusion sheet and a prism sheet can be used according to the purpose.
  • a lighting circuit 5 is arranged on the back side of the knock frame lb.
  • the lighting circuit 5 is typically a PWM (Pulse Width Modulation) circuit as long as the fluorescent lamp 2 can be turned on and off.
  • PWM Pulse Width Modulation
  • Optical sheet 4 diffusion sheet, prism sheet,
  • Phosphor 23 Y203: Eu3 + (R), LaP04: Ce3 +, Tb3 + (G), BaMg2A110O17: Eu2 + (B),
  • the configuration other than the phosphor 23 has the same specifications as in Example 1.
  • FIG. 5 is a diagram for explaining the light emission characteristics when the lamp of Example 1 and FIG. 6 are turned on by blinking lighting of the lamp of Comparative Example 1.
  • the horizontal axis represents time
  • the vertical axis represents voltage or current value.
  • Waveform (A) in the figure is an on / off signal that is a voltage waveform for controlling on / off of the fluorescent lamp
  • waveform (B) is the lamp voltage waveform
  • waveform (C) is the lamp current waveform
  • waveform (D) is the lamp waveform. It is an output voltage waveform obtained by photoelectrically converting the emission intensity with a photodiode.
  • Example 1 Comparing the light emission waveforms of FIGS. 5 and 6, it can be seen that in Example 1, the response speed of the comparative example beam is faster. Specifically, the 1/10 afterglow time of Example 1 is about 3 mse C , and Comparative Example 1 is about 7 msec. Example 1 is turned off earlier. Also, regarding the 90% light emission rise time, Example 1 is less than 3 msec, while Comparative Example 1 is less than 8 msec.
  • Example 1 when each lamp is mounted on a liquid crystal display device and a moving image is taken, the force that Example 1 hardly left as an afterimage is comparatively clear in Example 1 that an afterimage remains and the moving image appears blurred. there were.
  • the brightness was compared when the liquid crystal was closed at the lamp turn-off timing, that is, when the lamp brightness was obtained only during the lamp on-time.
  • the duty ratio was 100%, the luminance of both lamps relative to the luminous flux was about 95% in Example 1 and about 70% in Comparative Example 1. That is, the liquid crystal display device using Example 1 was clearly felt brighter.
  • Example 1 Comparative Example 1
  • a green phosphor having a different response speed with respect to the on / off signal is used as shown in FIG.
  • FIGS. 5 and 6 when a three-wavelength phosphor is used, there is a large difference in the rise and afterglow of the lamp. From this, when flashing with the fluorescent lamp 2 coated with a three-wavelength phosphor, if one of the phosphors of R (red), G (green), and B (blue) has a slow response speed, It was speculated that the response speed of fluorescent lamps would slow down.
  • the response speed of the phosphor is mainly related to the activator of the phosphor.
  • the composition of the phosphor is expressed as Y203: Eu3 +, the force S that generally calls Y203 as the matrix and Eu3 + as the activator S, as can be seen from FIG. It was found that it was almost dependent on the drug. Therefore, when a test was conducted by paying attention to the phosphor activator, a phosphor composed of an activator selected from Sn2 +, Pr3 +, EU2 +, EU3 +, Ce3 +, Tb3 + would be 1/10 of 5 msec or less. It turned out that it was easy to realize the afterglow time.
  • Eu3 + and Tb3 + activators have a response speed of several msec, there are phosphors whose 1/10 afterglow time exceeds 5 msec depending on the combination with the base material. Therefore, in these cases, only phosphors with 1/10 afterglow time of 5 msec or less are suitable for blinking lighting.
  • Sn2 +, Pr3 +, EU2 +, and Ce3 + activators have 90% emission rise time and 1/10 afterglow time of about 0.1 msec, and the phosphor responds almost without delay to the on / off signal. In particular, it can be said that it is suitable for flashing lighting applications.
  • the characteristics of the activator having the slowest response speed tend to be obtained as the response speed of the phosphor.
  • the response speed of Ceb + containing Ce3 + with a high response speed is obtained, and the response speed of Tb3 + with a slower response speed is obtained. That is, in the case of a plurality of activations, if one of them includes an activation agent having a slow response speed, it is not suitable as a phosphor used for blinking lighting.
  • the fluorescent lamp of the present invention is also effective when dimming by the PWM method.
  • dimming is performed mainly for the purpose of adjusting the contrast, but as a result, it is difficult to leave afterimages!
  • blinking lighting is performed using a fluorescent lamp in which an RGB phosphor 23 having a 1/10 afterglow time force of ⁇ msec or less is applied to the inner surface of the glass container 21.
  • an RGB phosphor 23 having a 1/10 afterglow time force of ⁇ msec or less is applied to the inner surface of the glass container 21.
  • such phosphors have a 90% emission rise time of 5 msec or less. Therefore, when the liquid crystal display device is configured by synchronizing the lamp and liquid crystal on / off, the luminance loss of the lamp is small. High brightness can be realized.
  • the red phosphor is Sn2 +, Pr3 +, Eu2 +, Eu3 +
  • the green phosphor is Eu2 +, Ce3 +, Tb3 +
  • the blue phosphor is a lamp with a three-wavelength phosphor containing an activator selected from Eu2 +. If configured, the above effect can be reproduced.
  • the blinking lighting method is used as the backlight device lighting method, but the present invention can also be effectively applied to a scanning lighting type backlight device.
  • FIG. 10 is a diagram for explaining a scanning lighting type backlight device.
  • each of the 12 lamps is divided into 2 lamps to form 6 lamp groups, and each lamp group is input with an on / off signal that is shifted by 1/6 time, and the scanning lights up. Is doing.
  • the on / off signal has a frequency of 60 Hz and a duty ratio of 50%, and is generated by the PWM method.
  • This scanning lighting method is different from the blinking lighting method in that one or more of the lamp groups are always turned on in the lighting state.
  • a light device can be realized.
  • FIG. 11 is a diagram for explaining an embodiment of a liquid crystal display device using the fluorescent lamp of the present invention.
  • a housing is constituted by a front case FC and a back case BC.
  • a liquid crystal panel LCP is disposed on the opening surface of the front case FC.
  • the back case BC has a shape of a bottomed opening, and a backlight device BL is disposed therein.
  • FIG. 12 is a diagram for explaining the light emission characteristics when the lamp of the backlight device BL is turned on and off.
  • the horizontal axis represents time
  • the vertical axis represents voltage or current value.
  • waveform (A) in the figure is an on / off signal that is a voltage waveform for controlling on / off of the fluorescent lamp
  • waveform (B) is the lamp voltage waveform
  • waveform (C) is the lamp current waveform
  • waveform (D) is the lamp waveform.
  • the waveform is a signal for opening and closing the liquid crystal forming the liquid crystal panel LCP
  • the waveform) is the emission waveform obtained by the liquid crystal panel LCP
  • the waveform (G) is the emission waveform that cannot be obtained by the liquid crystal panel LCP. is there.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Liquid Crystal (AREA)
  • Liquid Crystal Display Device Control (AREA)
  • Control Of Indicators Other Than Cathode Ray Tubes (AREA)
  • Vessels And Coating Films For Discharge Lamps (AREA)

Abstract

La présente invention concerne une lampe fluorescente (2) incluant une couche de matériau fluorescent (23) formée sur la face interne d'un récipient en verre (21). La couche de matériau fluorescent contient uniquement le matériau fluorescent (comme ce qui est spécifié par un matériau fluorescent contenant un activateur sélectionné à partir du groupe consistant en Sn2+, Pr3+, Eu2+, Eu3+, Ce3+ et Tb3+), qui possède une période d'accroissement d'éclairement lumineux de 90 % de 5 millisecondes ou moins et une période résiduelle d'un dixième de 5 millisecondes ou moins. Cette lampe fluorescente peut clignoter rapidement de manière à ce qu'elle puisse supprimer la formation d'une image résiduelle si elle est utilisée en tant que rétroéclairage du dispositif d'affichage à cristaux liquides de type clignotant, dans lequel le rétroéclairage est faite clignoter en réponse à la commande du cristal liquide.
PCT/JP2007/068695 2006-09-27 2007-09-26 Lampe fluorescente clignotante, dispositif de rétroéclairage et dispositif d'affichage à cristaux liquides WO2008038670A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008536397A JPWO2008038670A1 (ja) 2006-09-27 2007-09-26 点滅点灯用蛍光ランプ、バックライト装置及び液晶表示装置

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2006-263143 2006-09-27
JP2006263143 2006-09-27
JP2007100368 2007-04-06
JP2007-100368 2007-04-06

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WO2008038670A1 true WO2008038670A1 (fr) 2008-04-03

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JP (1) JPWO2008038670A1 (fr)
KR (1) KR20090055023A (fr)
TW (1) TW200822171A (fr)
WO (1) WO2008038670A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2002577C2 (nl) * 2009-02-27 2010-08-30 Nieuwenhuis Window Film B V Infrarood licht converterende composities.
JP2010217310A (ja) * 2009-03-13 2010-09-30 Sony Corp 画像表示装置、画像表示観察システム及び画像表示方法

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002105447A (ja) * 2000-09-29 2002-04-10 Matsushita Electric Ind Co Ltd 液晶表示装置

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002105447A (ja) * 2000-09-29 2002-04-10 Matsushita Electric Ind Co Ltd 液晶表示装置

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL2002577C2 (nl) * 2009-02-27 2010-08-30 Nieuwenhuis Window Film B V Infrarood licht converterende composities.
JP2010217310A (ja) * 2009-03-13 2010-09-30 Sony Corp 画像表示装置、画像表示観察システム及び画像表示方法

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JPWO2008038670A1 (ja) 2010-01-28
KR20090055023A (ko) 2009-06-01
TW200822171A (en) 2008-05-16

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