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WO2015199310A1 - Unité de rétroéclairage et dispositif d'affichage la comprenant - Google Patents

Unité de rétroéclairage et dispositif d'affichage la comprenant Download PDF

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Publication number
WO2015199310A1
WO2015199310A1 PCT/KR2015/001798 KR2015001798W WO2015199310A1 WO 2015199310 A1 WO2015199310 A1 WO 2015199310A1 KR 2015001798 W KR2015001798 W KR 2015001798W WO 2015199310 A1 WO2015199310 A1 WO 2015199310A1
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WO
WIPO (PCT)
Prior art keywords
light
quantum dot
backlight unit
light source
disposed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/KR2015/001798
Other languages
English (en)
Korean (ko)
Inventor
오진목
조병권
최문구
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Electronics Inc
Original Assignee
LG Electronics Inc
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 KR1020140132549A external-priority patent/KR101581762B1/ko
Application filed by LG Electronics Inc filed Critical LG Electronics Inc
Priority to CN201580034574.3A priority Critical patent/CN106662775B/zh
Priority to EP20167565.9A priority patent/EP3693789B1/fr
Priority to US15/321,643 priority patent/US10168461B2/en
Priority to EP15812582.3A priority patent/EP3163366B1/fr
Publication of WO2015199310A1 publication Critical patent/WO2015199310A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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  • the present invention relates to a back light unit (BLU) using a quantum dot phosphor, and more particularly, to a backlight unit for realizing high color reproduction and a display device having the same.
  • BLU back light unit
  • the backlight unit emits light on the back of the liquid crystal panel so that an image can be seen by the user. Since the liquid crystal panel does not emit light by itself, the backlight unit needs to illuminate the back of the liquid crystal panel evenly so that the user may visually recognize the image output from the display device.
  • the backlight unit includes a light source, and the light source has led to the use of a light emitting diode (LED) in a cold cathode fluorescent lamp (CCFL).
  • the light emitting diode has low power consumption, long life, and is easy to be manufactured in a small sized device, and thus has many advantages over cold cathode fluorescent lamps.
  • white light may be formed by a combination of light emitted from light emitting diodes emitting blue light, red light and green light, respectively.
  • this method requires an excessively large number of light emitting diodes, and requires an additional feedback system, causing the unit cost of the display device to increase.
  • Another way to form white light is to combine a light emitting diode that emits blue light with a yellow (YAG) phosphor. Compared to a combination of blue light, red light, and green light, this method reduces the number of light emitting diodes required by one third and does not require a feedback system, thereby reducing the manufacturing cost of the display device. However, this method has a limitation in showing limited color reproduction.
  • Quantum dot phosphors have different properties from ordinary phosphors. Quantum dots emit light of various wavelengths depending on the type of material and the size of the particles. For example, the smaller the particle size, the shorter the wavelength of the quantum dots, the larger the particle size of the longer wavelength light. Therefore, by adjusting the size of the quantum dot can emit light of the desired wavelength from the infrared to the ultraviolet region.
  • the quantum dot phosphor is excited by primary light provided from a light source to emit secondary light having a wavelength different from that of the primary light.
  • primary light refers to light emitted from a light source such as a light emitting diode.
  • Secondary light refers to light excited from primary light by a quantum dot phosphor.
  • the color gamut of a display device refers to an ability to express colors of the display device.
  • the color gamut of the display device is expressed as a percentage of the color reproduction area ATSC (Advanced Television System Committee) of the existing liquid crystal display (LCD) or a percentage of the new broadcasting standard DPI (Dot per Inch). .
  • the main factors in determining the color reproducibility are the wavelength and full width at half maximum (FWHM) of the three-element light emitted from the backlight unit.
  • the backlight unit having a narrow half width can implement high color reproduction of the display device.
  • the half-value width of the backlight unit using the InP-based quantum dot phosphor is about 50 nm or less
  • the half-value width of the backlight unit using the Cd-based quantum dot phosphor is about 30 nm or less. Since the half width of the backlight unit using the InP-based quantum dot phosphor is wider than the half width of the backlight unit using the Cd-based quantum dot phosphor, the former color reproducibility is lower than that of the latter.
  • the wavelength is easy to adjust.
  • the half width is known to be difficult to reduce due to the intrinsic nature of the material and the spread of the process.
  • the factor for determining the half width is attributable to the size distribution of particles and defects on the surface. Therefore, the backlight unit using the quantum dot phosphor requires a number of process improvements in order to reduce the half width, but a yield decrease is expected in the process.
  • One object of the present invention is to provide a backlight unit capable of realizing high color reproducibility by reducing the half width of the peak in the light spectrum.
  • Another object of the present invention is to provide a backlight unit capable of realizing high color reproduction and suppressing the shortening of the lifetime of the quantum dot phosphor.
  • a backlight unit includes: a light source formed to provide primary light; A quantum dot phosphor which is excited by primary light provided from the light source, emits secondary light having a wavelength different from that of the primary light, and is spaced apart from the light source; And an optical cutting agent absorbing light having a specific wavelength from the primary light or the secondary light.
  • the optical cutting agent a dye for absorbing or reflecting light of a specific wavelength; Pigments that absorb or reflect light of a particular wavelength; And a light emitting dye that absorbs light of a specific wavelength and emits light having a longer wavelength than absorbed light.
  • the light cutting agent may be made of dyes or pigments that give a red, green, blue or purple color.
  • the red dye or pigment reflects light of 620-650 nm
  • the green dye or pigment reflects light of 520-550 nm
  • the blue dye or pigment is 440-460 nm light.
  • the dye or pigment that reflects the violet color may reflect light of 400 to 460 nm.
  • the dye or pigment may absorb light of 480 ⁇ 520nm, 540 ⁇ 630nm or 650nm or more.
  • the optical cutting agent may include light-emitting dyes that absorb light of 480 to 520 nm, 540 to 630 nm, or 650 nm and emit light of 620 to 650 nm, 520 to 550 nm, 440 to 460 nm or 400 to 460 nm. Can be.
  • the backlight unit may further include a matrix configured to support the quantum dot phosphor and the optical cutting agent, and the quantum dot phosphor, the optical cutting agent, and the matrix may form a composite. .
  • the light source may be disposed on one surface of the printed circuit board, and the composite may be formed in the form of a film and may face the light source at a position spaced apart from the printed circuit board.
  • the backlight unit may further include a light guide plate for guiding light provided from the light source, wherein the light source is disposed at an edge of the light guide plate, and the composite is formed in the form of a tube and disposed between the light source and the light guide plate. have.
  • the backlight unit may further include a light guide plate for guiding light provided from the light source, the light source may be disposed at an edge of the light guide plate, and the composite may be formed in the form of a film and face one surface of the light guide plate. .
  • the backlight unit may include: a first matrix configured to support the quantum dot phosphor; And a second matrix configured to support the optical cutting agent, wherein the quantum dot phosphor and the first matrix form a quantum dot fluorescent film or a quantum dot fluorescent tube, and the optical cutting agent and the second matrix are optical cutting films.
  • the optical cutting film may be laminated on the quantum dot fluorescent film or the quantum dot fluorescent tube.
  • the light source is disposed on one surface of a printed circuit board, and the quantum dot fluorescent film is disposed to face the light source at a position spaced apart from the printed circuit board, and the light cutting film is disposed on the first matrix based on the first matrix. Can be arranged on the opposite side.
  • the backlight unit further includes a light guide plate for guiding light provided from the light source, the light source is disposed at the edge of the light guide plate, the quantum dot fluorescent tube is disposed to face one surface of the light guide plate, and the light cutting film is The quantum dot fluorescent tube may be disposed on an opposite side of the light guide plate.
  • the backlight unit further includes a light guide plate for guiding light provided from the light source, the light source is disposed on the edge of the light guide plate, the quantum dot fluorescent film is disposed to face one surface of the light guide plate, and the light cutting film is The quantum dot fluorescent film may be disposed on an opposite side of the light guide plate.
  • the backlight unit may include: a bead configured to support the quantum dot phosphor and the optical cutting agent; And a matrix configured to support the beads, wherein the beads include the quantum dot phosphor and the optical cutting agent therein and form a composite with the matrix.
  • the light source may be disposed on one surface of the printed circuit board, and the composite may be formed in the form of a film and may face the light source at a position spaced apart from the printed circuit board.
  • the backlight unit may further include a light guide plate for guiding light provided from the light source, wherein the light source is disposed at an edge of the light guide plate, and the composite is formed in the form of a tube and disposed between the light source and the light guide plate. have.
  • the backlight unit may further include a light guide plate for guiding light provided from the light source, the light source may be disposed at an edge of the light guide plate, and the composite may be formed in the form of a film and face one surface of the light guide plate. .
  • the present invention discloses a display device including a backlight unit in order to realize the above object.
  • the display device includes a liquid crystal panel; And a backlight unit emitting light to a rear surface of the liquid crystal panel, wherein the backlight unit comprises: a light source configured to provide primary light; A quantum dot phosphor which excites the primary light provided from the light source to emit secondary light having a wavelength different from that of the primary light, and is spaced apart from the light source; And an optical cutting agent absorbing light having a specific wavelength from the primary light or the secondary light.
  • the present invention can achieve high color reproduction without a separate additional process by reducing the half width of the light spectrum.
  • the present invention makes it possible to use a general color filter in the display device instead of the thick color filter required for high color reproduction.
  • the present invention can suppress the shortening of the life of the quantum dot phosphor due to heat transmitted from the light source.
  • FIG. 1 is a conceptual diagram of a display device related to the present invention.
  • FIG. 2 is an exploded perspective view of a backlight unit related to the present invention
  • FIG. 3 is a side sectional view of a backlight unit related to the present invention.
  • FIG. 4 is a conceptual view showing a liquid crystal panel and an optical sheet coupled to the housing.
  • FIG. 5 is a conceptual diagram illustrating an edge type display device.
  • FIG. 6 is an exploded perspective view showing a display module of a mobile terminal according to the present invention.
  • FIG. 7 is a side sectional view showing a display module of a mobile terminal related to the present invention.
  • FIG. 8 is a conceptual diagram of a quantum dot related to the present invention.
  • FIG. 9 is a conceptual diagram of a quantum dot fluorescent film and a backlight unit having the same.
  • FIG. 10 is a conceptual diagram of a quantum dot fluorescent tube and a backlight unit having the same;
  • FIG. 11 is a conceptual diagram of a composite comprising a quantum dot phosphor and an optical cutting agent.
  • 12 is a light spectrum showing the wavelength-specific transmittance of light for green dye.
  • FIG. 13 is a light spectrum showing the wavelength-specific transmittance of light for a violet pigment.
  • 14 is a light spectrum showing the transmittance of each wavelength of light with respect to a red-emitting light emitting dye.
  • 15 is a conceptual diagram of a quantum dot fluorescent film and an optical cutting film.
  • 16 is a conceptual diagram of a composite comprising an optical cutting agent and a quantum dot phosphor dispersed in beads.
  • FIG. 17 is a conceptual diagram illustrating a process of light when a quantum dot fluorescent film and a light cutting film are applied to a backlight unit.
  • 18 is another conceptual diagram illustrating the progress of light when the tube-type complex is applied to the backlight unit.
  • 19A is a light spectrum showing color gamut in a display device that does not use an optical cutting agent.
  • 19B is a light spectrum showing color gamut in a display device using an optical cutting agent.
  • the backlight unit and the display device will be described first, and then the quantum dot and the quantum dot phosphor applied to the backlight unit will be described.
  • the backlight unit to which the quantum dot phosphor is applied will be described, and the backlight unit to which the optical cutting agent proposed in the present invention is applied will be described.
  • FIG. 1 is a conceptual diagram of a display apparatus 100 according to the present invention.
  • the display apparatus 100 of FIG. 1 illustrates an example in which the display apparatus 100 of FIG. 1 is applied to a television.
  • the display apparatus 100 of the present invention is not necessarily limited to a television, but may be applied to a mobile terminal such as a smartphone or a tablet, a monitor, and the like.
  • the display apparatus 100 may include a liquid crystal panel 110, a backlight unit 120, a cover 130, a housing 135, a driver 140, and a rear case 150.
  • the liquid crystal panel 110 is a portion where an image is implemented, and may include a first substrate 111 and a second substrate 112 bonded to each other with the liquid crystal layer interposed therebetween.
  • a plurality of pixels may be defined in the first substrate 111 called a TFT array substrate by crossing a plurality of scan lines and data lines in a matrix shape.
  • Each pixel may be provided with a thin film transistor (TFT) capable of turning on / off a signal.
  • TFT thin film transistor
  • Each pixel may include a pixel electrode connected to each of the thin film transistors.
  • the second substrate 112 may be provided with color filters of red (R), green (G), and blue (B) respectively corresponding to the plurality of pixels.
  • the second substrate 112 may be provided with a black matrix that surrounds the color filters and covers non-display elements such as a scan line, a data line, and a thin film transistor.
  • the second substrate 112 may be provided with a transparent common electrode covering the color filter and the black matrix.
  • a printed circuit board is connected to at least one side of the liquid crystal panel 110 through a connecting member such as a flexible circuit board or a tape carrier package (TCP), and the printed circuit board is provided in the housing 135 in a modularization process. It may be arranged in close contact with the back of the.
  • a connecting member such as a flexible circuit board or a tape carrier package (TCP)
  • TCP tape carrier package
  • the data driving circuit 114 when the thin film transistor selected for each scan line is turned on by the on / off signal of the gate driving circuit 113 transmitted from the scan line, the data driving circuit 114 is turned on. The data voltage of is transferred to the corresponding pixel electrode through the data line. As a result, an arrangement direction of the liquid crystal molecules may be changed by an electric field between the pixel electrode and the common electrode, thereby indicating a difference in transmittance.
  • the display apparatus 100 of the present invention may include a backlight unit 120 that may provide light to the liquid crystal panel 110 from the rear surface of the liquid crystal panel 110.
  • the backlight unit 120 may include an optical assembly 123 and a plurality of optical sheets 125 disposed on the optical assembly 123.
  • at least one of the plurality of optical sheets 125 may be a film including a quantum dot composite. Detailed description of the backlight unit 120 will be described later.
  • the liquid crystal panel 110 and the backlight unit 120 described above may be modularized through the cover 130 and the housing 135.
  • the cover 130 positioned at the front of the liquid crystal panel 110 may be a top cover.
  • the cover 130 may have a rectangular frame shape covering the top and side surfaces of the liquid crystal panel 110.
  • the front surface of the cover 130 may be opened to expose an image implemented in the liquid crystal panel 110.
  • the housing 135 positioned on the rear surface of the backlight unit 120 may include a bottom plate 135a and a supporting plate 135b.
  • the bottom plate 135a may be a bottom cover.
  • the bottom plate 135a serves as a support for the display apparatus 100 in combination with the liquid crystal panel 110 and the backlight unit 120, and may have a square plate shape.
  • the supporting plate 135b is formed to be coupled to the cover 130 and the bottom plate 135a and may serve to support the backlight unit 120.
  • the driving unit 140 may be disposed on one surface of the housing 135.
  • the driving unit 140 may include a driving control unit 141, a main board 142, and a power supply unit 143.
  • the driving controller 141 may be a timing controller, and adjusts an operation timing of each driving circuit of the liquid crystal panel 110.
  • the main board 142 transmits V sink, H sink, and R, G, and B resolution signals to the timing controller.
  • the power supply unit 143 applies power to the liquid crystal panel 110 and the backlight unit 120.
  • the driving unit 140 may be provided on one surface of the housing 130 positioned on the rear surface of the backlight unit 120 by the driving unit chassis 145. In addition, the driving unit 140 may be wrapped by the rear case 150.
  • FIG. 2 is an exploded perspective view of the backlight unit 200 according to the present invention.
  • 3 is a side cross-sectional view of the backlight unit 200 according to the present invention.
  • the backlight unit 200 may include an optical assembly 210 and an optical sheet 250.
  • the optical assembly 210 may include a first layer 215, a plurality of light sources 217, a reflective layer 220, a second layer 230, and a diffusion plate 240.
  • a plurality of light sources 217 are disposed on the first layer 215.
  • the second layer 230 is formed to cover the plurality of light sources 217 and is disposed on the first layer 215.
  • the first layer 215 may be a substrate, and a plurality of light sources 217 may be mounted on the substrate.
  • an electrode pattern (not shown) for connecting an adapter (not shown) for supplying power and the light source 217 may be formed on the substrate.
  • a carbon nanotube electrode pattern (not shown) for connecting the light source 217 and an adapter (not shown) may be formed on an upper surface of the substrate.
  • the first layer 215 may be a printed circuit board (PCB) substrate, and the PCB substrate may be made of polyethylene terephthalate (PET), glass, polycarbonate (PC), silicon (Si), or the like.
  • the first layer 215 may be formed in the form of a film.
  • the light source 217 may be one of a light emitting diode (LED) chip or a light emitting diode package having at least one light emitting diode chip.
  • LED light emitting diode
  • a light emitting diode (LED) package as the light source 217 will be described as an example, but the light source 217 of the present invention is not necessarily limited thereto.
  • the light emitting diode package constituting the light source 217 may be divided into a top view method and a side view method according to a direction in which the light emitting surface faces, and the light source 217 according to an embodiment of the present invention.
  • the silver may be configured using at least one of a top view LED package in which the light emitting surface is formed upward and a side view LED package in which the light emitting surface is formed toward the side.
  • Each of the light sources 217 may have a light emitting surface disposed at a side thereof, and may emit light in a lateral direction, that is, a direction in which the first layer 215 or the reflective layer 220 extends. This structure may reduce the thickness of the second layer 230 formed on the light source 217 to implement a slimming of the backlight unit 200, and further to realize a slimming of the display device.
  • the light source 217 may be a colored LED or a white LED emitting at least one of colors such as red, blue, and green.
  • the colored LED may include at least one of a red LED, a blue LED, and a green LED, and the arrangement and emission light of the light emitting diode may be variously changed and applied.
  • the second layer 230 is disposed on the first layer 215 and is formed to cover the plurality of light sources 217.
  • the second layer 230 transmits and diffuses the light emitted from the light source 217 so that the light emitted from the light source 217 is uniformly provided to the liquid crystal panel.
  • the reflective layer 220 reflecting the light emitted from the light source 217 may be positioned on the first layer 215.
  • the reflective layer 220 may be formed in an area except for an area where the light source 217 is formed on the first layer 215.
  • the reflective layer 220 may reflect the light emitted from the light source 217 and reflect the light totally reflected from the boundary of the second layer 230 to spread the light more widely.
  • the reflective layer 220 may include at least one of a metal or a metal oxide that is a reflective material.
  • the reflective layer 220 may include, for example, a metal or metal oxide having high reflectance such as aluminum (Al), silver (Ag), gold (Ag), or titanium dioxide (TiO 2).
  • the reflective layer 220 may be formed by depositing or coating the metal or metal oxide on the first layer 215, or may be formed by printing a metal ink.
  • a vacuum deposition method such as a thermal evaporation method, an evaporation method or a sputtering method may be used as the deposition method.
  • a coating or printing method a printing method, a gravure coating method or a silk screen method may be used.
  • the second layer 230 disposed on the first layer 215 may be made of a light transmissive material, for example, silicone or acrylic resin.
  • the second layer 230 is not limited to the above materials and may be made of various resins.
  • the second layer 230 may be formed of a resin having a refractive index of about 1.4 to 1.6 so that the backlight unit 200 has a uniform brightness by diffusion of light emitted from the light source 217.
  • the second layer 230 may be polyethylene terephthalate (PET), polycarbonate (PC), polypropylene (PP), polyethylene (PE), polystyrene (PS), polyepoxy (PE), silicone, acrylic, or the like. It may be formed of any one material selected from the group consisting of.
  • the second layer 230 may include a polymer resin having adhesiveness so as to be in close contact with the light source 217 and the reflective layer 220.
  • the second layer 230 may be unsaturated polyester, methyl methacrylate, ethyl methacrylate, isobutyl methacrylate, normal butyl methacrylate, normal butyl methyl methacrylate, acrylic acid, methacrylic acid, Hydroxyethyl methacrylate, hydroxy propyl methacrylate, hydroxy ethyl acrylate, acrylamide, metyrol acrylamide, glycidyl methacrylate, ethyl acrylate, isobutyl acrylate, normal butyl acrylate, 2 -Acryl-based, urethane-based, epoxy-based, melamine-based, and the like, such as ethyl hexyl acrylate polymer or copolymer or terpolymer.
  • the second layer 230 may be formed by applying a liquid or gel-like resin on the first layer 215 on which the plurality of light sources 217 and the reflective layer 220 are formed and then curing, or supporting It may be formed by applying a resin on the sheet, then partially curing and bonding the resin onto the first layer 215.
  • the diffusion plate 240 may be provided on the second layer 230 so that light emitted from the light sources 217 may be diffused upward.
  • the diffusion plate 240 may be attached to the second layer 230, and may be attached using an additional adhesive member.
  • the optical sheet 250 may be positioned on the optical assembly 210 described above, and at least one of the optical sheets 250 may be a film including a quantum dot composite.
  • FIG. 4 is a conceptual diagram illustrating a liquid crystal panel 400 and an optical sheet 250 coupled to a housing.
  • the liquid crystal panel 400 may be positioned on the cover 300, and the optical sheet 250 may be positioned on the liquid crystal panel 400.
  • a plurality of gate driving circuits 410 are disposed at left and right sides of the liquid crystal panel 400, and a printed circuit board 420 is disposed below the optical sheet 250 from the liquid crystal panel 400 under the liquid crystal panel 400. ) May be arranged.
  • a plurality of data driving circuits 430 may be disposed on the printed circuit board 420.
  • the optical sheet 250 disposed on the cover 300 may be coupled to the fixing part 310 of the cover 300.
  • the fixing part 310 may be inserted into the hole 251 of the optical sheet 250.
  • the fixing part 310 formed on the upper wall of the cover 300 may be inserted into the hole 251 formed in the protrusion 252. That is, the fixing part 310 may be coupled to the hole 251 of the optical sheet 250 in the inserted shape.
  • the fixing part 310 formed on the lower wall of the cover 300 may be inserted into the hole 251 formed in the protrusion 252.
  • the protrusion 252 of the optical sheet 250 and the fixing part 310 of the cover 300 may be disposed between the data driving circuits 430 of the liquid crystal panel 400.
  • the fixing part 310 is disposed between the data driving circuits 430 and the fixing part 310 of the fixing part 310.
  • the protrusion 252 and the hole 251 of the optical sheet 250 may also be disposed between the data driving circuit 430.
  • FIG. 5 is a conceptual diagram illustrating an edge type display apparatus 500.
  • the display apparatus 500 may include a bottom plate 510, an optical assembly 540, an optical sheet 560, and a liquid crystal panel 570.
  • the bottom plate 510 accommodates the optical assembly 540 and the optical sheet 560, and may be a bottom plate of the housing.
  • the optical assembly 540 housed in the bottom plate 510 may include a first layer 541 and a light source 542.
  • the first layer 541 may be a substrate on which the plurality of light sources 542 are mounted, and an adapter (not shown) for supplying power and an electrode pattern (not shown) for connecting the light source 542 may be formed. Can be.
  • the first layer 541 may be a printed circuit board (PCB) substrate made of polyethylene terephthalate (PET), glass, polycarbonate (PC), silicon (Si), or the like, in which a plurality of light sources 542 are mounted. It may be formed in the form of a film.
  • PCB printed circuit board
  • the light source 542 may be one of a light emitting diode (LED) chip or a light emitting diode package having at least one light emitting diode chip.
  • LED light emitting diode
  • a light emitting diode package as the light source 542 will be described as an example.
  • the LED package constituting the light source 542 may be divided into a top view method and a side view method according to a direction in which the light emitting surface is directed.
  • the light source 542 according to an embodiment of the present invention The light emitting surface may be configured using at least one of the LED package of the top view type formed toward the upper side and the LED package of the side view type formed to the side.
  • the light guide plate 543 is disposed in a direction in which light of the light source 542 is emitted, and may serve to spread light incident from the light source 542 widely.
  • the reflector 544 may be disposed under the light guide plate 543, and may reflect the light reflected downward from the light guide plate 543 upward.
  • the optical assembly 540 including the first layer 541 and the light source 542 may be positioned on the side of the bottom plate 510 to serve as a backlight unit that implements light in an edge manner. This method is distinguished from the direct method described in FIG.
  • the optical sheet 560 may be positioned on the light guide plate 543.
  • the optical sheet 560 may be a diffusion sheet for diffusing light or a prism sheet for condensing light, and may be formed in plural.
  • the optical sheet 560 may be mounted on the light guide plate 560, and may be coupled to the fixing part 520 formed on the sidewall of the bottom plate 510.
  • the optical sheet 560 may include a plurality of holes 565.
  • the bottom plate 510 may include a plurality of fixing parts 520.
  • the optical sheet 560 may be fixed to the bottom plate 510 by coupling the hole 565 of the optical sheet 560 to the fixing part 520 formed on the sidewall of the bottom plate 510.
  • the mobile terminal corresponds to an example of a display device that outputs visual information.
  • the display module functions to output visual information from the mobile terminal.
  • the mobile terminal described herein includes a mobile phone, a smart phone, a laptop computer, a digital broadcasting terminal, a personal digital assistant, a portable multimedia player, a navigation, a slate PC , Tablet PCs, ultrabooks, wearable devices, such as smartwatches, glass glasses, head mounted displays, and the like. have.
  • FIG. 6 is an exploded perspective view illustrating a display module 600 of a mobile terminal related to the present invention.
  • a liquid crystal panel 610, a backlight unit 620, and a mold 630 are illustrated as an exploded perspective view of the display module 600.
  • the liquid crystal panel 610 outputs a desired color for each pixel by inducing a phase change of the liquid crystal by applying a signal to the transistor.
  • the liquid crystal panel 610 is composed of two transparent substrates 611 and 712 and a liquid crystal layer 614 positioned therebetween. A transparent upper electrode is formed on the upper substrate 611, and a transparent lower electrode is formed on the lower substrate 612.
  • the upper substrate 611 is also referred to as a color filter layer including a color filter for displaying color.
  • a color filter layer including a color filter for displaying color.
  • the backlight unit 620 is positioned below the liquid crystal panel 610 to uniformly supply light toward the liquid crystal panel 610.
  • the backlight unit 620 includes a light guide plate 621 and a light source 622 for supplying light to the light guide plate 621.
  • the light guide plate 621 may be made of a transparent material, for example, a transparent acrylic panel.
  • various patterns may be formed on the surface, and a prism film, a reflective film 623, or the like may be attached to the surface.
  • the light source 622 supplies light to the light guide plate 621.
  • FIG. 6 illustrates a light source 622 in the form of an LED, various types of light sources 622 may be used.
  • the position of the light source 622 is not limited to the side of the light guide plate 621 as shown in FIG. 6 and may be formed at various positions.
  • the mold 630 covers the side surface of the backlight unit 620 in combination with the circumference of the liquid crystal panel 610 and the backlight unit 620.
  • FIG. 7 is a side sectional view showing a display module 700 of a mobile terminal related to the present invention.
  • the display module 700 is disposed in an area defined by the front case 701.
  • the backlight unit 720 is disposed in an area defined by the mold 730.
  • the mold 730 includes the panel support part 731 and sidewall parts 732 extending from the panel support part 731 in the front direction of the display module 700 to cover the side surface of the liquid crystal panel 710.
  • the mold 730 may be configured of only a panel support part 731 whose upper surface is coupled around the lower surface of the liquid crystal panel 710.
  • the panel support 731 of the mold 730 surrounds the backlight unit 720.
  • An upper surface of the mold 730 is in contact with a lower surface of the liquid crystal panel 710 to fix the backlight unit 720 and the liquid crystal panel 710.
  • the mold 730 may further include a sidewall portion 732 extending from the panel support 731 as described above, and the side portion 732 covers the side surface of the liquid crystal panel 710.
  • the side wall portion 732 protects the side surfaces of the liquid crystal panel 710 and the backlight unit 720 and supports the force pressed by the glass 711 on the front surface.
  • the mold 730 covers the side surface of the backlight unit 720, light may be emitted from the side surface of the backlight unit 720 through the side surface of the panel support 731.
  • the bright mold 730 When the bright mold 730 is used, light may be reflected on the sidewall portion 732 of the mold 730 to be incident to the side of the liquid crystal panel 710.
  • light leakage may occur due to light incident through an abnormal path in addition to the normal path incident from the rear of the liquid crystal panel 710.
  • the mold 730 may be configured of only the panel support part 731 without the side wall part 732 being omitted. In this case, light incident to the mold 730 is not incident to the side of the liquid crystal panel 710. This structure can block the light incident to the side by removing the structure that is a problem of light leakage phenomenon.
  • a case protrusion (not shown) may be further provided on the side of the case 701.
  • the protection function of the liquid crystal panel 710 which the side wall portion 732 of the mold 730 is in charge of, may replace the case protrusion.
  • the case protrusion is integrally formed with the case 701, so there is no surface reflecting light toward the liquid crystal panel 710. Accordingly, the case protrusion may prevent light from being incident on the side surface of the liquid crystal panel 710.
  • the quantum dot phosphor according to the present invention will be described, and the quantum dot composite using the quantum dot phosphor will be described.
  • FIG. 8 is a conceptual diagram of a quantum dot 41 related to the present invention.
  • the quantum dot 41 is composed of a nano-sized core 41a made of an inorganic material and an organic ligand 41c for stabilizing the core 41a.
  • Various quantum dots 41 have been reported, such as II-VI, III-V, IV-VI, and I-III-V.
  • the core 41a is very unstable because it has a very large surface area and volume ratio.
  • Unstable surfaces and traps affect light generation and result in non-fluorescent energy release, which absolutely lowers quantum efficiency.
  • What has been reported as a means to prevent quantum efficiency degradation is that the core 41a is wrapped in a shell 41b made of an inorganic material, thereby making the quantum dot 41 stable.
  • the quantum dot phosphor uses the quantum dot described in FIG. 8 as a phosphor.
  • the quantum dot phosphor is excited by primary light provided from a light source to emit secondary light of a wavelength different from that of the primary light.
  • the quantum dot phosphor may be excited by blue primary light provided from a light source to emit green or red secondary light.
  • the primary light and the secondary light may be classified into before and after being absorbed by the quantum dot phosphor.
  • Light that excites the quantum dot phosphor such as light provided from a light source, is classified as primary light.
  • Light emitted from the quantum dot phosphor is classified as secondary light.
  • the fluorescence of the quantum dot 41 is light generated when the excited electrons descend from the conduction band to the valence band.
  • the quantum dot phosphor has a full width at half maximum (FWHM, the width of the position having a half value of the maximum value in the relative spectral distribution) than the conventional phosphor, which is advantageous for high color reproduction.
  • the quantum dot phosphor When blue primary light is used as a light source, the quantum dot phosphor is excited by blue primary light and emits green or red secondary light. Thus, when the primary light and the secondary light are combined, white light may be formed.
  • FIG. 9 is a conceptual diagram of a quantum dot fluorescent film 840 and a backlight unit 800 having the same.
  • the backlight unit 800 of FIG. 9 illustrates a direct type as an example.
  • the backlight unit 800 of the present invention is not necessarily limited to the direct type.
  • the backlight unit 800 includes a light source and a quantum dot fluorescent film 840.
  • the light source is formed to provide primary light.
  • the light source may include a light emitting diode 810 that emits light by applying current.
  • the light emitting diode 810 may be disposed on one surface of the printed circuit board 860.
  • a reflective plate is formed on one surface of the printed circuit board 860, and a light emitting diode 810 may be disposed on the reflective plate.
  • the reflector reflects lost light that does not face the quantum dot fluorescent film 840 to the quantum dot fluorescent film 840.
  • the light emitting diode 810 illustrated in FIG. 9 is configured to emit blue primary light.
  • the quantum dot fluorescent film 840 is a component including a quantum dot phosphor 841.
  • the quantum dot fluorescent film 840 is configured to emit three primary light using primary light provided from the light emitting diode 810.
  • the quantum dot phosphor 841 is excited by primary light provided from the light emitting diode 810 to emit secondary light having a wavelength different from that of the primary light.
  • the configuration of the quantum dot phosphor 841 may vary depending on the light source and the inorganic phosphor. As shown in FIG. 9, when the light emitting diode 810 emits blue primary light, the quantum dot composite 840 includes a green light emitting quantum dot phosphor 841a and a red light emitting quantum dot phosphor 841b.
  • the green light emitting quantum dot phosphor 841a is excited by the blue primary light provided from the light emitting diode 810 to give the green secondary light.
  • the red light emitting quantum dot phosphor 841b is excited by the blue primary light provided from the light emitting diode 810 to emit red secondary light.
  • the backlight unit 800 may emit ternary light including blue primary light, green secondary light, and red secondary light.
  • the light source includes a light emitting diode emitting blue primary light
  • the backlight unit may include a green light emitting inorganic phosphor or a red light emitting inorganic phosphor.
  • the quantum dot fluorescent film includes a red light emitting quantum dot phosphor.
  • the red light emitting quantum dot phosphor is excited by blue primary light provided from the light emitting diode and green primary light provided from the green light emitting inorganic phosphor to emit red secondary light. Blue light is provided from a light emitting diode, green light is provided from a green light emitting inorganic phosphor, and red light is provided from a red light emitting quantum dot phosphor. Therefore, the backlight unit may emit three-way light even without the green light-emitting quantum dot phosphor.
  • the quantum dot fluorescent film includes a green light emitting quantum dot phosphor.
  • the green light emitting quantum dot phosphor is excited by blue primary light provided from the light emitting diode to emit green secondary light. Blue light is provided from a light emitting diode, green light is provided from a green light emitting quantum dot phosphor, and red light is provided from a red light emitting inorganic phosphor. Therefore, the backlight unit may emit three-way light even without the red light-emitting quantum dot phosphor.
  • the quantum dot phosphors 841a and 841b are disposed to be spaced apart from the light emitting diodes 810 so as to suppress the shortening of the lifespan caused by the heat of the light emitting diodes 810.
  • the quantum dot fluorescent film 840 is disposed to be spaced apart from the light emitting diode 810 to form a remote phosphor structure.
  • the remote phosphor means that the light source and the phosphor are components separated from each other, and are spaced apart from each other.
  • the quantum dot fluorescent film 840 is disposed to face the light emitting diodes 810, and may receive blue primary light directly from the light emitting diodes 810.
  • FIG. 10 is a conceptual diagram of a quantum dot fluorescent tube 940 and a backlight unit 900 having the same.
  • FIG. 10 illustrates an edge type backlight unit 900 in which a light source is disposed at an edge of the light guide plate 920.
  • the backlight unit 900 of the present invention is not necessarily limited to the edge type.
  • the backlight unit 900 includes a light source, a quantum dot fluorescent tube 940, and a light guide plate 920.
  • the light source is formed to provide primary light.
  • the light source may include a light emitting diode 910 that emits blue primary light.
  • the quantum dot phosphors 941a and 941b are disposed to be spaced apart from the light emitting diodes 910 so as to suppress the shortening of the lifetime of the light emitting diodes 901 due to heat.
  • the structure of the backlight unit 900 illustrated in FIG. 10 is different from that of the backlight unit 800 illustrated in FIG. 9, but is the same in that the quantum dot phosphor 941 is spaced apart from the light emitting diode 910.
  • the quantum dot fluorescent tube 940 is disposed spaced apart from the light emitting diode 910 to form a remote phosphor structure.
  • the quantum dot fluorescent tube 940 is disposed to face the light emitting diode 910 and receives primary light directly from the light emitting diode 910.
  • the quantum dot fluorescent tube 940 is disposed between the light emitting diode 910 and the light guide plate 920.
  • the light guide plate 920 is disposed on an opposite side of the light emitting diode 910 based on the quantum dot fluorescent tube 940. Three-way light emitted from the quantum dot fluorescent tube 940 is guided by the light guide plate 920 to be directed to the liquid crystal panel described above.
  • the quantum dot fluorescent tube 940 is configured to emit three-way light using the primary light provided from the light emitting diode 910.
  • Quantum dot fluorescent tube 940 includes quantum dot phosphor 941.
  • the quantum dot phosphor 941 is excited by primary light provided from the light emitting diode 910 to emit secondary light having a wavelength different from that of the primary light.
  • the type of the quantum dot phosphor 941 may be changed according to the light source and the inorganic phosphor, as described above with reference to FIG. 9.
  • the light emitting diodes 910 may emit blue primary light.
  • the quantum dot fluorescent tube 940 includes a green light emitting quantum dot phosphor 941a and a red light emitting quantum dot phosphor 941b.
  • the green light emitting quantum dot phosphor 941a is excited by primary light to emit green secondary light.
  • the red light emitting quantum dot phosphor 941b is excited by primary light to emit red secondary light.
  • the backlight unit 900 emits ternary light including blue primary light, green secondary light, and red secondary light.
  • FIG. 11 is a conceptual diagram of a composite 1040 including a quantum dot phosphor 1041 and an optical cutting agent 1041.
  • the composite 1040 may include a quantum dot phosphor 1041, a scattering agent 1042, a matrix 1043, and an optical cutting agent 1044.
  • the quantum dot phosphor 1041 is excited by primary light provided from a light source to emit secondary light having a wavelength different from that of the primary light.
  • the quantum dot phosphor 1041 shown in FIG. 11 is shown to include a green light emitting quantum dot phosphor 1041a and a red light emitting quantum dot phosphor 1041b. Accordingly, it can be estimated that the light source may be made of only a light emitting diode (not shown) that emits blue primary light.
  • the efficiency of the composite 1040 is directly related to the cost of the product, the performance of the product and the size of the product. Only when the quantum dot composite 1040 having a high efficiency can be used to reduce the unit cost of the product, it is possible to implement a slimmer backlight unit.
  • the quantum dot composite 1040 having high efficiency means that only a small number of quantum dot phosphors 1041 may sufficiently emit three-way light.
  • a scattering agent 1042 is used to scatter primary light.
  • the scattering agent 1042 scatters the primary light so as to increase the amount of light converted from the primary light to the secondary light by the quantum dot phosphor 1041.
  • Scattering agent 1042 improves the efficiency of the composite 1040 through scattering of primary light.
  • the scattering agent 1042 prevents secondary light emitted from the quantum dot phosphor 1041 from being reabsorbed by the other quantum dot phosphor 1041 and improves the extraction efficiency of the secondary light. Accordingly, the scattering agent 1042 may improve the efficiency of the quantum dot composite 1040.
  • the matrix 1043 is made to support the quantum dot phosphor 1041 and the scattering agent 1042.
  • the matrix 1043 may be formed by curing of the resin.
  • the quantum dot phosphor 1041 and the scattering agent 1042 are dispersed inside the matrix 1043.
  • the composite 1040 can be formed in the form of a film or tube by the matrix 1043.
  • the color gamut of the display device depends on the wavelength of the three-way light provided by the backlight unit and the half width in the light spectrum. The narrower the half width, the higher the color gamut of the display device.
  • the half width is known to be difficult to reduce due to the intrinsic properties of the material and the dispersion of the process.
  • the factor for determining the half width is attributable to the size distribution of particles and defects on the surface.
  • the present invention uses the optical cutting agent 1044 to overcome this limitation of the prior art.
  • Light cutting agent 1044 absorbs light of a particular wavelength from the primary or secondary light to reduce the half width of the peak in the light spectrum.
  • the matrix 1043 is made to support the quantum dot phosphor 1041, the scattering agent 1042, and the light cutting agent 1044.
  • the quantum dot phosphor 1041, the scattering agent 1042, and the optical cutting agent 1044 are dispersed in the matrix 1043.
  • the quantum dot phosphor 1041, the scattering agent 1042, the optical cutting agent 1044, and the matrix 1043 form a composite 1040.
  • the composite 1040 may be formed in the form of a film or tube.
  • the backlight unit may have the structure described with reference to FIG. 9.
  • the light emitting diode may be disposed on one surface of the printed circuit board, and the composite 1040 may be disposed to face the light emitting diode at a position spaced apart from the printed circuit board.
  • the backlight unit may be formed in the structure described with reference to FIG. 10 or the structure of FIG. 18 to be described later.
  • the light emitting diode may be disposed at the edge of the light guide plate
  • the composite 1040 may be disposed between the light emitting diode and the light guide plate.
  • the composite 1040 may be formed in the form of a film and arranged to face one surface of the light guide plate.
  • the light cutting agent 1044 may include at least one of a dye, a pigment, and a luminescent dye.
  • the dyes, pigments and luminescent dyes all serve as light cutting agents 1044 in the present invention to reduce the half width of the light spectral peak.
  • each of dyes, pigments and light emitting dyes will be described.
  • the dye absorbs light of a certain wavelength.
  • Pigments also absorb light of a certain wavelength.
  • Dyes and pigments are substances that make colors that correspond to wavelengths that are not absorbed. Dyes and pigments are common in that they are colorants. However, dyes are generally used in the state dissolved in a solvent, and pigments are different from each other in that they are used in the form of particles dispersed in a solvent. However, in the present invention, both the dye and the pigment may be used as the optical cutting agent 1044, it is not used for a completely different purpose to distinguish from each other.
  • the dye may include, for example, at least some of red dyes, green dyes, blue dyes and violet dyes.
  • Pigments, like dyes may include, for example, at least some of red pigments, green pigments, blue pigments, and purple pigments.
  • the red dye or the red pigment reflects light of 620-650 nm. This means that the main reflection peak of red dye or red pigment in the light spectrum is formed at 620-650 nm.
  • a greenish dye or greenish pigment reflects light at 520-550 nm. This means that the main reflection peak of the greenish dye or greenish pigment in the light spectrum is formed at 520-550 nm. Green dyes absorb some of the shorter wavelengths of blue light and the longer wavelengths of red light.
  • Blue dyes or blue pigments reflect light of 440-460 nm. This means that the main reflection peak of the blue dye or the blue pigment in the light spectrum is formed at 440 nm to 460 nm. Blue dyes absorb mainly orange light.
  • Purple dyes or purple pigments reflect light of 400-460 nm. This means that the main reflection peak of the violet dye or violet pigment in the light spectrum is formed at 400 to 460 nm.
  • the dye or pigment absorbs light of 480-520 nm, 540-630 nm or more than 650 nm. This means that the absorption peak of the dye or pigment in the light spectrum is formed at 480-520 nm, 540-630 nm or 650 nm.
  • luminescent dyes may also be used as the optical cutting agent 1044 of the present invention.
  • Luminescent dyes absorb light of a particular wavelength and emit longer wavelengths than absorbed light.
  • the luminescent dye absorbs light of 480 to 520 nm, 540 to 630 nm or more than 650 nm to give light of 620 to 650 nm, 520 to 550 nm, 440 to 460 nm or 400 to 460 nm. It has an absorption peak of luminescent dye in the light spectrum of 480-520 nm, 540-630 nm or 650 nm, and an emission peak of 620-650 nm, 520-550 nm, 440-460 nm or 400-460 nm. It means to be.
  • the dyes and pigments having the reflection wavelength and the absorption wavelength described above, and the light emitting dyes having the absorption wavelength and the emission wavelength described above all correspond to the optical cutting agent 1044 capable of reducing the half width of the peak in the light spectrum. do.
  • the reflected and absorbed wavelength ranges are important factors related to the half width reduction of peaks in the light spectrum.
  • FIG. 12 is a light spectrum showing the wavelength-specific transmittance of light for green dye.
  • the horizontal axis of the light spectrum represents the wavelength of light (nm), and the vertical axis represents the transmittance (%).
  • the low light transmittance in the specific wavelength range means that the light absorption in the wavelength range is high.
  • an absorption peak of light in the light spectrum of the green dye is formed in a range of about 687 nm. It can be seen that the dye dyeing green through the absorption peak of light absorbs light having a wavelength of about 687 nm. In addition, since the absorption peak of green dye is higher than 650 nm, it can be seen that the green dye can be used as the optical cutting agent of the present invention.
  • FIG. 13 is a light spectrum showing the wavelength-specific transmittance of light for a violet pigment.
  • the absorption peak of light in the light spectrum of the violet pigment is formed in the range of about 583 nm. It can be seen that the pigment which gives a purple color through the absorption peak of light absorbs light having a wavelength of about 583 nm. In addition, since the absorption peak of the violet pigment is in the range of 540 ⁇ 630 nm, it can be seen that the violet pigment can be used as the optical cutting agent of the present invention.
  • FIG. 14 is a light spectrum showing the transmittance of each wavelength of light with respect to a light emitting dye emitting red color.
  • the horizontal axis of the light spectrum represents the wavelength of light (nm) and the vertical axis is an arbitrary unit representing the relative light intensity.
  • the absorption peak of light in the light spectrum of the light emitting dye emitting red color is formed in the range of about 593 nm, and the emission peak is formed in the range of about 638 nm.
  • the luminescent dye that emits red through the absorption peak and the emission peak absorbs light having a wavelength of about 593 nm, and emits light having a wavelength of about 638 nm.
  • the absorption peak of the red light emitting dye is in the range of 540 ⁇ 630 nm and the light emission peak is in the range of 620 ⁇ 650 nm, it can be seen that the red light emitting dye can be used as the optical cutting agent of the present invention. .
  • 15 is a conceptual diagram of a quantum dot fluorescent film 1140a and an optical cutting film 1140b.
  • the optical cutting agent 1144 of FIG. 15 is disposed on a layer different from the quantum dot phosphor 1141.
  • the quantum dot fluorescent film 1140a includes a quantum dot phosphor 1141, a scattering agent 1142, and a first matrix 1143a.
  • the first matrix 1143a is formed to support the quantum dot phosphor 1141 and the scattering agent 1142.
  • the quantum dot phosphor 1141 and the scattering agent 1142 are dispersed in the first matrix 1143a.
  • the quantum dot phosphor 1141, the scattering agent 1142, and the first matrix 1143a form the quantum dot fluorescent film 1140a.
  • the quantum dot phosphor 1141, the scattering agent 1142, and the first matrix 1143a may form the quantum dot fluorescent film 1140a.
  • the structure of the film and the tube refer to FIGS. 9 and 10, respectively.
  • the optical cutting film 1140b includes a second matrix 1143b and an optical cutting agent 1144.
  • the second matrix 1143b is configured to support the light cutting agent 1144.
  • the optical cutting agent 1144 is dispersed in the second matrix 1143b.
  • the optical cutting agent 1144 and the second matrix 1143b form the optical cutting film 1140b.
  • the light cutting film 1140b is laminated on the quantum dot fluorescent film 1140a or the quantum dot fluorescent tube (not shown).
  • the structure of the backlight unit including the quantum dot fluorescent film 1140a and the light cutting film 1140b will be replaced with the description of FIG. 9 and FIG. 17 to be described later.
  • the structure of the backlight unit including the quantum dot fluorescent tube and the light cutting film is replaced with the description of FIG. 10 and FIG. 18 to be described later.
  • FIG. 16 is a conceptual diagram of a composite 1240 including an optical cutting agent 1244 and a quantum dot phosphor 1241 dispersed in a bead 1245.
  • the composite 1240 includes a quantum dot phosphor 1241, a scattering agent 1242, a matrix 1243, and an optical cutting agent 1244. Since the description of other components is the same as the description of FIG. 14, the description thereof is replaced with the above description, and the difference from FIG. 14 will be described.
  • the composite 1240 further includes a bead 1245 configured to support the quantum dot phosphor 1241 and the optical cutting agent 1244.
  • Bead 1245 may be considered to correspond to another matrix that is distinct from matrix 1243.
  • the quantum dot phosphor 1241 and the optical cutting agent 1244 are dispersed in the beads 1245.
  • the beads 1245 including the quantum dot phosphor 1241 and the light cutting agent 1244 are again dispersed in the matrix 1243.
  • the beads 1245 are dispersed in the matrix 1243 to form a composite with the matrix 1243.
  • the composite 1240 may be formed in the form of a film or tube.
  • the composite 1240 formed in the form of a film will be replaced with the description of FIG. 9 and FIG. 17 to be described later.
  • the composite 1240 formed in the form of a tube is replaced with the description of FIG. 10 and FIG. 18 to be described later.
  • FIG. 17 is a conceptual diagram illustrating a process of light when the quantum dot fluorescent film 1340a and the light cutting film 1340b are applied to the backlight unit 1300.
  • an arrow means a light propagation path.
  • reference numerals of the following rules are given to arrows in FIG. 17.
  • the primary light such as light provided from a light source or emitted from an inorganic phosphor, is assigned a 1 in the tenth position. Secondary light emitted from the quantum dot phosphor is given 2 in the tenth position.
  • blue primary light provided from a light source is given the reference numeral 10a.
  • a is given to blue light
  • b is given to green light
  • c is given to red light.
  • green secondary light is given the reference numeral 20b.
  • FIG. 17 since the quantum dot fluorescent film 1340a and the light cutting film 1340b are shown as separate components, the configuration illustrated in FIG. 17 corresponds to the configuration described with reference to FIG. 12.
  • the quantum dot fluorescent film 1340a is spaced apart from the light emitting diode 1310 to form a remote phosphor structure. Since the quantum dot fluorescent film 1340a is disposed to be spaced apart from the light emitting diode 1310, the shortening of the life of the quantum dot phosphor (not shown) due to the heat of the light emitting diode 1310 can be suppressed. As illustrated in FIG. 17, the quantum dot fluorescent film 1340a may be disposed between the light guide plate 1320 and the optical sheet 1350.
  • the light emitting diode 1310 emits blue primary light 10a.
  • the light guide plate 1320 guides the primary light 10a.
  • the reflective plate 1330 reflects the primary light 10a, and the reflected primary light 10a passes through the light guide plate 1320 and enters the quantum dot fluorescent film 1340a.
  • the quantum dot fluorescent film 1340a emits ternary light using the primary light 10a.
  • the quantum dot fluorescent film 1340a of the present invention includes quantum dot phosphors (refer to 1141a and 1141b in Fig. 15. Reference numerals are omitted below).
  • the green light emitting quantum dot phosphor is excited by blue primary light 10a to emit green secondary light 20b.
  • the red light emitting quantum dot phosphor 1141b is excited by the blue primary light 10a to emit the red secondary light 20c.
  • the quantum dot fluorescent film 1340a emits blue primary light 10a, green secondary light 20b, and red secondary light 20c.
  • the backlight unit 1300 may emit white light by the combination of the blue primary light 10a, the green secondary light 20b, and the red secondary light 20c.
  • the optical cutting film 1340b includes an optical cutting agent (not shown), which absorbs light of a specific wavelength from the primary light or the secondary light so as to reduce the half width of the peak in the light spectrum.
  • the light cutting film 1340b is laminated on the quantum dot fluorescent film 1340a.
  • the light cutting film 1340b is disposed on the opposite side of the light guide plate 1320 based on the quantum dot fluorescent film 1340a.
  • the half width of the peak in the light spectrum may be reduced by the light cutting film 1340b.
  • the present invention can reduce the half width of the peak by using an optical cutting agent, and can increase the color reproducibility of the display device by reducing the half width.
  • FIG. 18 is another conceptual diagram illustrating the progress of light when the tube-type composite 1440 is applied to the backlight unit 1400.
  • the light emitting diode 1410 emits blue primary light 10a.
  • the composite 1440 emits tertiary light using the primary light 10a.
  • the composite 1440 may include, for example, a quantum dot phosphor 1041 (see FIG. 11), a scattering agent 1042 (see FIG. 11), a matrix 1043 (see FIG. 11), and a light cutting agent 1044, as described with reference to FIG. 11. 11).
  • the composite may include a quantum dot phosphor 1241 (see FIG. 16), a scattering agent 1242 (see FIG. 16), a matrix 1243 (see FIG. 16), and an optical cutting agent 1244 (see FIG. 16) as described in FIG. 16. ) May include dispersed beads 1245 (see FIG. 16).
  • a quantum dot phosphor, a scattering agent, and an optical cutting agent are dispersed in a resin and then cured in the form of a film or tube to form a film or tube-type composite.
  • the resin becomes the matrix described above.
  • thermosetting resin As the resin for dispersing the quantum dot phosphor and the scattering agent, a thermosetting resin, a photocuring resin or a dry curing resin may be used. In case of using thermosetting resin and photocuring resin, heat and light are used to cure the resin. In the case of using a dry curing resin, the quantum dot phosphor and the scattering agent are dispersed in a solvent, and then heat is applied to cure the resin.
  • the composite 1440 shown in FIG. 18 is formed in the form of a tube.
  • Composite 1440 is disposed spaced apart from light emitting diode 1410 to form a remote phosphor structure. Since the composite 1440 is disposed to be spaced apart from the light emitting diode 1410, the shortening of the life of the quantum dot phosphor (not shown) due to the heat of the light emitting diode 1410 can be suppressed.
  • the composite 1440 may be disposed between the light emitting diode 1410 and the light guide plate 1420.
  • the quantum dot phosphor (not shown) is excited by the primary light 10a to emit secondary light 20b, 20c having a wavelength different from that of the primary light 10a.
  • the green light emitting quantum dot phosphor (not shown) is excited by the blue primary light 10a to emit the green secondary light 20b.
  • the red light emitting quantum dot phosphor (not shown) is excited by the blue primary light 10a to emit the red secondary light 20c.
  • the composite 1440 emits blue primary light 10a, green secondary light 20b, and red secondary light 20c.
  • the backlight unit 1400 may emit white light by the combination of the blue primary light 10a, the green secondary light 20b, and the red secondary light 20c.
  • Light cutting agents absorb light of a particular wavelength from primary or secondary light to reduce the half width of the peak in the light spectrum.
  • the quantum dot phosphor and the optical cutting agent form one component called the composite 1440.
  • the half width of the peak in the light spectrum can be reduced by the optical cutting agent.
  • the light guide plate 1420 guides the primary light 10a and the secondary light 20b and 20c.
  • the reflector plate 1430 reflects the primary light 10a and the secondary light 20b and 20c, and the reflected primary light 10a and the secondary light 20b and 20c pass through the light guide plate 1420 to the optical sheet 1450. Incident.
  • 19A is a light spectrum showing color gamut in a display device that does not use an optical cutting agent.
  • 19B is a light spectrum showing color gamut in a display device using an optical cutting agent.
  • the horizontal axis represents the wavelength of light and the vertical axis represents the transmittance.
  • Three peaks are observed in each spectrum, showing the peaks of blue light, green light, and red light in order from left to right.
  • the color gamut of the display device of FIG. 19A corresponds to about 120%
  • the color gamut of the display device of FIG. 19B corresponds to about 130%.
  • the present invention can reduce the half width of a peak in the light spectrum by using an optical cutting agent including a dye, a pigment, or a light emitting dye. As the half width of the peak is reduced, the present invention can realize high color reproducibility of the display device.
  • the present invention overcomes these limitations by using an optical cutting agent including a dye, a pigment, or a luminescent dye, and proposes a method of increasing the color reproducibility of the display device.
  • the backlight unit and the display apparatus having the same described above are not limited to the configuration and method of the above-described embodiments, but the embodiments may be selectively combined with each or all of the embodiments so that various modifications can be made. It may be configured.
  • the present invention can be used in various industrial fields related to a display device for displaying image information and a backlight unit that is a component of the display device.

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Abstract

La présente invention concerne une unité de rétroéclairage apte à réaliser une large gamme de couleurs d'un dispositif d'affichage par réduction de la demi-largeur spectrale de la lumière. L'unité de rétroéclairage proposée par la présente invention comprend : une source de lumière qui est formée de manière à fournir une lumière primaire ; un luminophore à points quantiques qui est excité par la lumière primaire provenant de la source de lumière et émet une lumière secondaire ayant une longueur d'onde différente de la longueur d'onde de la lumière primaire, le luminophore à points quantiques étant agencé de façon à être espacé de la source de lumière ; et un agent de coupe de lumière qui absorbe la lumière d'une longueur d'onde spécifique de la lumière primaire ou de la lumière secondaire.
PCT/KR2015/001798 2014-06-27 2015-02-25 Unité de rétroéclairage et dispositif d'affichage la comprenant Ceased WO2015199310A1 (fr)

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CN201580034574.3A CN106662775B (zh) 2014-06-27 2015-02-25 背光单元以及包括该背光单元的显示装置
EP20167565.9A EP3693789B1 (fr) 2014-06-27 2015-02-25 Unité de rétroéclairage et dispositif d'affichage la comprenant
US15/321,643 US10168461B2 (en) 2014-06-27 2015-02-25 Backlight unit and display device comprising same
EP15812582.3A EP3163366B1 (fr) 2014-06-27 2015-02-25 Unité de rétroéclairage et dispositif d'affichage la comprenant

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105929480A (zh) * 2016-04-12 2016-09-07 苏州星烁纳米科技有限公司 一种新的导光板及其应用
WO2017201981A1 (fr) * 2016-05-24 2017-11-30 武汉保丽量彩科技有限公司 Film d'accentuation des couleurs destiné à être utilisé dans un appareil d'affichage en couleur et son procédé de fabrication
WO2018124858A1 (fr) * 2016-12-30 2018-07-05 (주)석경에이티 Luminophore ayant une grande reproductibilité de couleur, revêtu d'un agent absorbant la lumière de 550 à 600 nm, et del utilisant ce luminophore
CN111538186A (zh) * 2020-05-19 2020-08-14 Tcl华星光电技术有限公司 一种背光模组及其制备方法、液晶显示装置
CN116400531A (zh) * 2021-12-28 2023-07-07 乐金显示有限公司 背光单元和显示装置
EP3260910B1 (fr) * 2016-06-22 2024-07-24 Samsung Display Co., Ltd. Afficheur avec un convertisseur de longueur d'onde

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20120088273A (ko) * 2011-01-31 2012-08-08 엘지이노텍 주식회사 백라이트 유닛 및 그 제조 방법
JP2013105747A (ja) * 2011-11-14 2013-05-30 Planck Co Ltd 色温度調整装置、それを使用した色温度調整設備及び色温度調整の方法
KR20130095955A (ko) * 2012-02-21 2013-08-29 삼성전자주식회사 도광판, 이를 포함하는 백라이트유닛, 디스플레이장치 및 도광판 제조방법
KR20130120486A (ko) * 2010-11-10 2013-11-04 나노시스, 인크. 양자 도트 필름들, 조명 디바이스들, 및 조명 방법들
KR20140056490A (ko) * 2012-10-26 2014-05-12 삼성디스플레이 주식회사 백라이트 유닛 및 이를 포함하는 표시 장치

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20130120486A (ko) * 2010-11-10 2013-11-04 나노시스, 인크. 양자 도트 필름들, 조명 디바이스들, 및 조명 방법들
KR20120088273A (ko) * 2011-01-31 2012-08-08 엘지이노텍 주식회사 백라이트 유닛 및 그 제조 방법
JP2013105747A (ja) * 2011-11-14 2013-05-30 Planck Co Ltd 色温度調整装置、それを使用した色温度調整設備及び色温度調整の方法
KR20130095955A (ko) * 2012-02-21 2013-08-29 삼성전자주식회사 도광판, 이를 포함하는 백라이트유닛, 디스플레이장치 및 도광판 제조방법
KR20140056490A (ko) * 2012-10-26 2014-05-12 삼성디스플레이 주식회사 백라이트 유닛 및 이를 포함하는 표시 장치

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105929480A (zh) * 2016-04-12 2016-09-07 苏州星烁纳米科技有限公司 一种新的导光板及其应用
WO2017201981A1 (fr) * 2016-05-24 2017-11-30 武汉保丽量彩科技有限公司 Film d'accentuation des couleurs destiné à être utilisé dans un appareil d'affichage en couleur et son procédé de fabrication
EP3260910B1 (fr) * 2016-06-22 2024-07-24 Samsung Display Co., Ltd. Afficheur avec un convertisseur de longueur d'onde
WO2018124858A1 (fr) * 2016-12-30 2018-07-05 (주)석경에이티 Luminophore ayant une grande reproductibilité de couleur, revêtu d'un agent absorbant la lumière de 550 à 600 nm, et del utilisant ce luminophore
CN111538186A (zh) * 2020-05-19 2020-08-14 Tcl华星光电技术有限公司 一种背光模组及其制备方法、液晶显示装置
CN116400531A (zh) * 2021-12-28 2023-07-07 乐金显示有限公司 背光单元和显示装置

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