WO2008082136A1 - Unite de retroeclairage pourvue d'une structure de film luminophore - Google Patents

Unite de retroeclairage pourvue d'une structure de film luminophore Download PDF

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Publication number
WO2008082136A1
WO2008082136A1 PCT/KR2007/006815 KR2007006815W WO2008082136A1 WO 2008082136 A1 WO2008082136 A1 WO 2008082136A1 KR 2007006815 W KR2007006815 W KR 2007006815W WO 2008082136 A1 WO2008082136 A1 WO 2008082136A1
Authority
WO
WIPO (PCT)
Prior art keywords
light
light emitting
phosphor
phosphor film
lighting unit
Prior art date
Application number
PCT/KR2007/006815
Other languages
English (en)
Inventor
Hyuck Jung Choi
Sang Min Lee
Kyung Nam Kim
Yun Bok Lee
Original Assignee
Seoul Semiconductor Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from KR1020070135784A external-priority patent/KR101423456B1/ko
Application filed by Seoul Semiconductor Co., Ltd. filed Critical Seoul Semiconductor Co., Ltd.
Priority to US12/521,489 priority Critical patent/US8454184B2/en
Publication of WO2008082136A1 publication Critical patent/WO2008082136A1/fr

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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
    • G02F1/133603—Direct backlight with LEDs
    • 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
    • G02F1/133617—Illumination with ultraviolet light; Luminescent elements or materials associated to the cell

Definitions

  • the present invention relates to a back lighting unit, and more particularly, to a back lighting unit having a phosphor film structure formed on a light transmitting plate to convert the wavelength of light.
  • CCFL cold cathode fluorescent lamp
  • LED light emitting diode
  • LCD liquid crystal display
  • a back lighting unit using a CCFL has disadvantages in that a great quantity of mercury is contained therein not to be environment-friendly and it is difficult to obtain the wavelengths for three uniform primary colors (blue, green and red) due to intrinsic characteristics of the CCFL to depreciate the color reproducibility.
  • a back lighting unit using a light emitting diode has advantages in that it is environment-friendly and it is easy to implement the wavelengths for three uniform primary colors to have the excellent color reproducibility as compared with a CCFL. Furthermore, as high-intensity/high-powered light emitting diodes have been recently developed, the back lighting unit using the light emitting diode has been widely used for illumination of large- sized display devices such as medium to large scaled LCD devices.
  • the aforementioned back lighting unit has problems in that the space required for the color mixing is short, and both a diffusing sheet itself for diffusing the light and a precise design for the diffusing sheet are essentially required. Disclosure of Invention Technical Problem [5] To do this, a prior art has been disclosed in which a light emitting diode is installed adjacent to a side surface of a light guide plate and a phosphor film is interposed between the side surface of the light guide plate and the light emitting diode, which is disclosed in Japan Patent Laid-open Publication No. (Hei) 09-73807.
  • the aforementioned prior art has problems in that the light emitting diode provides only a small quantity of light may through the narrow side surface of the light guide plate, and more specifically, in that the size of the phosphor film is limited due to the area of the side surface of the light guide plate whereby a sufficient amount of the phosphors cannot be provided.
  • an object of the present invention is to provide a back lighting unit, wherein lower and upper surfaces of a light transmitting plate function as incident and exit surfaces of light, respectively, and a phosphor film structure for wavelength- converting the light is provided at a position which the light is incident on or exits from.
  • a back lighting unit which comprises: a light emitting means including a light emitting diode disposed to emit light upwards; a light transmitting plate disposed over the light emitting diode, the light transmitting plate having a lower surface allowing light to be incident thereon and an upper surface allowing light to exit therefrom; and a phosphor film structure including a particulate phosphor and formed on at least one of the lower and upper surfaces of the light transmitting plate.
  • the light emitting means includes a reflecting portion disposed under the light emitting diode and reflecting light upwards.
  • the phosphor film structure has two or more different color phosphor films arranged one above the other.
  • the light emitting diode is a blue light emitting diode
  • the phosphor film structure include a green phosphor film and a red phosphor film attached to a lower surface of the green phosphor film.
  • the red phosphor film may be formed with at least one opening allowing a portion of the green phosphor film to directly face the light emitting diode.
  • the phosphor film structure includes a plurality of dot-shaped phosphor films or a plurality of stripe-shaped phosphor films.
  • the phosphor films may be formed by a thermal printing method.
  • the phosphor film structure includes a plurality of dot-shaped phosphor films
  • the light emitting means includes a plurality of light emitting diodes
  • the plurality of dot-shaped phosphor films are disposed corresponding to the plurality of light emitting diodes.
  • the plurality of dot-shaped phosphor films are arranged at a predetermined interval on the upper surface of the light transmitting plate, and the plurality of dot-shaped phosphor films are disposed just above the plurality of light emitting diodes, respectively.
  • the light emitting means includes a blue light emitting diode and a red light emitting diode
  • the phosphor film structure includes a green phosphor film.
  • the phosphor film structure at least includes a silicate based phosphor having a chemical formula expressed as flows: [14]
  • M 1 is at least one element selected from the group consisting of Pb and Cu;
  • M is at least one element selected from the group consisting of Be, Mg, Ca, Sr, Ba, Zn, Cd and Mn;
  • M m is at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Au and Ag;
  • M is at least one element selected from the group consisting of B, Al, Ga and In;
  • M v is at least one element selected from the group consisting of Ge, V, Nb, Ta, W, Mo, Ti, Zr and Hf;
  • M is at least one element selected from the group consisting of Bi, Sn, Sb, Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb and Lu;
  • X is at least one element selected from the group consisting of F, Cl, Br and I; and 0 ⁇ a ⁇ 2, 0 ⁇ b ⁇ 8, 0 ⁇ c ⁇ 4, 0 ⁇ d ⁇ 2, 0 ⁇ e ⁇ 2, 0 ⁇ f ⁇
  • a large-sized display panel (specifically, LCD panel) can be provided with an illumination source having uniform brightness. Further, since a phosphor may serve to diffuse the light, the number of the light emitting diodes and the power consumption can be reduced in a back lighting unit in which a plurality of light emitting diodes are disposed under the light transmitting plate.
  • FIG. 1 is a conceptual view showing a back lighting unit according to one embodiment of the present invention.
  • FIG. 2 is a view showing a light transmitting plate and a phosphor film structure of the back lighting unit according to the embodiment of the present invention.
  • FIG. 3 is a view illustrating a phosphor film structure of a back lighting unit according to another embodiment of the present invention.
  • FIGS. 4 and 5 are views illustrating phosphor film structures according to further embodiments of the present invention, respectively.
  • Fig. 6 is a view illustrating a process of forming a phosphor film structure by a thermal printing method.
  • Fig. 7 is a view illustrating a back lighting unit according to a still further embodiment of the present invention.
  • FIG. 8 is a view illustrating a back lighting unit according to a still further embodiment of the present invention.
  • FIG. 1 is a conceptual view showing a back lighting unit according to one embodiment of the present invention.
  • a back lighting unit 1 includes a light emitting means having a light emitting diode 10, a light transmitting plate 20, and a phosphor film structure 30.
  • a reflecting portion 40 for reflecting light upwards may be disposed under the light emitting diode 10; and a prism sheet 50 for generating a parallel light may be disposed over the light transmitting plate 20.
  • the reflecting portion 40 may be a reflecting film attached onto a PCB 2 on which the light emitting diode 10 is mounted.
  • the light emitting diode 10 is disposed under the light transmitting plate 20 in order for the light emitted from the light emitting diode 10 itself to be directed upward to the light transmitting plate 20. Accordingly, a lower surface of the light transmitting plate 20 functions as an incident surface of light while an upper surface thereof functions as an exit surface of light.
  • the phosphor film structure 30 is formed on the lower surface of the light transmitting plate 20, so that the phosphor film structure 30 may cause the wavelength of a portion of the light emitted from the light emitting diode 10 to be converted into different wavelength at a position where the light is incident on the light transmitting plate 20.
  • the portion of the light whose wavelength is converted and the other portion of the light whose wavelength is not converted are allowed to be mixed in the light transmitting plate 20, and further, over the light transmitting plate 20.
  • the light transmitting plate 20 may function as a light guide plate used to obtain a surface light source.
  • the phosphor film structure 30 consists of at least one phosphor film which includes a particulate phosphor, so that the particulate phosphor may serve to diffuse the light.
  • the aforementioned position of the phosphor film structure 30 may cause a portion of the light whose wavelength is converted into different color wavelength and the other portion of the light whose wavelength is not converted to be sufficiently mixed in the light transmitting plate 20, and then, the mixed light proceeds.
  • the blue light emitting diode 10 and the phosphor film structure 30, which includes either green and red phosphors or a yellow phosphor, may be used to implement a white light source.
  • red and blue light emitting diodes 10 and 10 and the phosphor film structure 30 including a green phosphor may be used to implement a white light source.
  • the phosphor according to this embodiment may not be limited to specific series or kind of phosphor, but it is preferable that green to orange silicate phosphors, green to yellow thiogallate phosphors or red sulfide phosphors be used, which are disclosed in Korean Patent Laid-open Publication Nos. 10-2005-117165, 10-2006-2844 and 10-2006-28932 and Korean Patent Nos. 10-601200 and 10-642786.
  • the aforementioned documents may be incorporated herein as a portion of the specification.
  • the phosphor film structure 30 may be formed onto the entire lower surface of the light transmitting plate 20.
  • Fig. 2 is a view showing the phosphor film structure 30 according to the embodiment of the present invention.
  • the phosphor film structure 30 includes a first phosphor film 32 for emitting green color, which is directly attached to the lower surface of the light transmitting plate 20, and a second phosphor film 34 for emitting red color, which is attached to a lower surface of the first phosphor film 32.
  • the first phosphor film 32 includes, e.g., a silicate or thiogallate based particulate phosphor
  • the second phosphor film 34 includes, e.g., a sulfide based particulate phosphor.
  • a method for screen-printing the phosphor onto a transparent membrane may be used to form the phosphor films 32 and 34 as described above.
  • the light which proceeds from the light emitting diode toward the phosphor film structure 30 is blue.
  • the blue light which is emitted from the light emitting diode and then is incident into the light transmitting plate 20 without colliding with the phosphor films 32 and 34, the red light whose wavelength is converted by the red phosphor of the second phosphor film 34 and then is incident into the light transmitting plate 20, and the green light whose wavelength is converted by the green phosphor of the first phosphor film 32 and then is incident into the light transmitting plate 20 are mixed in the light transmitting plate 20 and above of the light transmitting plate 20.
  • a color mixing process of light may be mainly performed inside the light transmitting plate 20. This is because the phosphors in the respective phosphor films 32 and 34 cause the light to be scattered or diffused.
  • the first phosphor film 32 including the green phosphor is disposed over the second phosphor film 34 including the red phosphor, so that the green light having a higher energy level can be prevented from being absorbed into the red light having a lower energy level, and the loss due to the aforementioned absorption can be prevented from occurring.
  • Fig. 3 is a view illustrating a phosphor film structure according to another embodiment of the present invention.
  • a phosphor film structure 30 of this embodiment is configured to have first and the second phosphor films 32 and 34, which are respectively composed of the same kinds of materials as described in the previous embodiment and arranged one above the other to have the same positions as described in the previous embodiment.
  • the phosphor film structure 30 of this embodiment may further include at least one opening 342 formed in the second phosphor film 34 so that a portion of the first phosphor film 32 may directly face the light emitting diode 10 (see Fig. 1).
  • Such an opening 342 serves to increase the amount of the blue light which is emitted from the light emitting diode and proceeds toward the first phosphor film 32 or the light transmitting plate 20 installed thereon without passing through the second red phosphor film 34. Accordingly, the amount of the blue light, which has been directly color-converted (i.e., wavelength-converted) into the green light by the phosphor of the first phosphor film 32, is increased.
  • Figs. 4 and 5 are views illustrating phosphor film structures according to further embodiments of the present invention, respectively.
  • Fig. 6 is a view illustrating a thermal printing process by which the phosphor film structure 30 as described in the previous embodiments is formed on a surface of the light transmitting plate 20.
  • a thermal printing film F in which a base film 3, a thermal transition film 4 and the phosphor film 30a are sequentially laminated, is compressed on a surface of the light transmitting plate 20, and then, a portion on the base film 3 is locally irradiated with a laser beam.
  • the thermal transition film 4 causes the laser beam to be transited into heat.
  • the transited heat causes a portion of the phosphor film 30a to adhere to the light transmitting plate 20.
  • the phosphor film structures 30 can be formed on the light transmitting plate 20, as shown in Figs. 4 and 5.
  • FIG. 7 is a view illustrating a back lighting unit 1 according to a still further embodiment of the present invention, wherein the phosphor film structure 30 is formed on the upper surface of the light transmitting plate 20.
  • the heat generated from the light emitting diode 10 rarely reaches the phosphor film structure 30, there is an advantage in that it is possible to prevent deterioration of the phosphor film structure 30 caused by the heat generated from the light emitting diode 10.
  • Fig. 8 is a view illustrating a back lighting unit according to a still further embodiment of the present invention.
  • a back lighting unit 1 of this embodiment includes a plurality of light emitting diodes 10 which are arranged at a predetermined interval, a thin light transmitting plate 20 which is disposed adjacent to the upside of the light emitting diodes 10, a phosphor film structure 30 formed on an upper surface of the light transmitting plate 20, and a diffusing plate 70 upwardly spaced apart from the light transmitting plate 20 on which the phosphor film structure 30 is formed.
  • the phosphor film structure 30 includes a plurality of dot-shaped phosphor films
  • the dot-shaped phosphor films 302 which are formed on the upper surface of the light transmitting plate 20 and arranged at a predetermined interval. At this time, it is preferable that the dot-shaped phosphor films 302 be formed by the thermal printing method as described in the preceding embodiment, but an inkjet or screen printing method may also be used. The positions of the dot-shaped phosphor films 302 are determined corresponding to the light emitting diodes 10. More specifically, the dot-shaped phosphor films 302 are disposed just above their corresponding light emitting diodes 10, respectively.
  • the respective dot-shaped phosphor films 302 and the respective light emitting diodes 10 are arranged corresponding in position to each other, whereby the use of the phosphor can be decreased to contribute to the cost reduction and the increase of the color uniformity of the light.
  • This color uniformity can be implemented by increasing the concentration of the phosphors onto the positions adjacent to the light emitting diode and the optical paths from the light emitting diode.

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Led Device Packages (AREA)

Abstract

L'invention concerne une unité de rétroéclairage dans laquelle les surfaces inférieure et supérieure d'une plaque de transmission de lumière servent respectivement de surface d'incidence et de sortie de lumière, une structure de film luminophore destinée à la conversion par longueur d'onde de la lumière étant placée dans une position permettant l'incidence ou la sortie de la lumière. L'unité de rétroéclairage selon l'invention comprend un moyen électroluminescent pourvu d'une diode électroluminescente disposée de sorte à émettre de la lumière vers le haut ; une plaque de transmission de lumière disposée par-dessus la diode électroluminescente, ladite plaque comprenant une surface inférieure que la lumière vient frapper et une surface supérieure de laquelle sort la lumière ; et une structure de film luminophore comprenant un luminophore particulaire, formée sur au moins la surface inférieure ou la surface supérieure de la plaque de transmission de lumière.
PCT/KR2007/006815 2006-12-28 2007-12-26 Unite de retroeclairage pourvue d'une structure de film luminophore WO2008082136A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/521,489 US8454184B2 (en) 2006-12-28 2007-12-26 Back lighting unit having phosphor film structure

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR10-2006-0136437 2006-12-28
KR20060136437 2006-12-28
KR10-2007-0135784 2007-12-21
KR1020070135784A KR101423456B1 (ko) 2006-12-28 2007-12-21 형광막 구조를 포함하는 백라이팅 유닛

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WO2008082136A1 true WO2008082136A1 (fr) 2008-07-10

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2175436A1 (fr) * 2008-10-08 2010-04-14 Richard Peter James Barton Matrice de point et affichages segmentés avec un éclairage uniforme
EP2226673A1 (fr) 2009-03-06 2010-09-08 OSRAM Opto Semiconductors GmbH Unité de rétroéclairage
EP3252525A3 (fr) * 2016-05-30 2018-03-14 Maven Optronics Co., Ltd. Dispositif d'affichage et son procédé de fabrication

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003066872A (ja) * 2001-08-22 2003-03-05 Sony Corp 表示装置
KR20050022820A (ko) * 2003-08-30 2005-03-08 (주)싸이버뱅크 ＬＥＤ 칩(ｃｈｉｐ)을 이용한 면광원 장치
US20050073495A1 (en) * 2003-10-03 2005-04-07 Gerard Harbers LCD backlight using two-dimensional array LEDs
US20050274972A1 (en) * 2004-06-10 2005-12-15 Seoul Semiconductor Co., Ltd. Light emitting device
KR200410425Y1 (ko) * 2005-11-01 2006-03-09 울트라 브라이트 레즈 캄퍼니 리미티드 광원 모듈과 액정 패널 조합장치
US20060255711A1 (en) * 2005-04-12 2006-11-16 Norihiro Dejima Lighting unit, display device, and phosphor film

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2003066872A (ja) * 2001-08-22 2003-03-05 Sony Corp 表示装置
KR20050022820A (ko) * 2003-08-30 2005-03-08 (주)싸이버뱅크 ＬＥＤ 칩(ｃｈｉｐ)을 이용한 면광원 장치
US20050073495A1 (en) * 2003-10-03 2005-04-07 Gerard Harbers LCD backlight using two-dimensional array LEDs
US20050274972A1 (en) * 2004-06-10 2005-12-15 Seoul Semiconductor Co., Ltd. Light emitting device
US20060255711A1 (en) * 2005-04-12 2006-11-16 Norihiro Dejima Lighting unit, display device, and phosphor film
KR200410425Y1 (ko) * 2005-11-01 2006-03-09 울트라 브라이트 레즈 캄퍼니 리미티드 광원 모듈과 액정 패널 조합장치

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2175436A1 (fr) * 2008-10-08 2010-04-14 Richard Peter James Barton Matrice de point et affichages segmentés avec un éclairage uniforme
EP2226673A1 (fr) 2009-03-06 2010-09-08 OSRAM Opto Semiconductors GmbH Unité de rétroéclairage
EP3252525A3 (fr) * 2016-05-30 2018-03-14 Maven Optronics Co., Ltd. Dispositif d'affichage et son procédé de fabrication
US10620478B2 (en) 2016-05-30 2020-04-14 Maven Optronics Co., Ltd. Photoluminescent display device and method for manufacturing the same

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