WO2017012133A1 - 一种显示面板 - Google Patents

一种显示面板 Download PDF

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Publication number
WO2017012133A1
WO2017012133A1 PCT/CN2015/085560 CN2015085560W WO2017012133A1 WO 2017012133 A1 WO2017012133 A1 WO 2017012133A1 CN 2015085560 W CN2015085560 W CN 2015085560W WO 2017012133 A1 WO2017012133 A1 WO 2017012133A1
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Prior art keywords
layer
display panel
quantum dot
light
panel according
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PCT/CN2015/085560
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English (en)
French (fr)
Inventor
姜宇锐
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深圳市华星光电技术有限公司
武汉华星光电技术有限公司
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Priority to US14/897,658 priority Critical patent/US10068949B2/en
Publication of WO2017012133A1 publication Critical patent/WO2017012133A1/zh

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    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/35—Devices specially adapted for multicolour light emission comprising red-green-blue [RGB] subpixels
    • 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
    • G02F1/133528—Polarisers
    • 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
    • G02F1/133553—Reflecting elements
    • 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
    • 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
    • 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
    • G02F1/133621—Illuminating devices providing coloured light
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
    • G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
    • G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
    • G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
    • G09G3/36—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals
    • G09G3/3607—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source using liquid crystals for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H10K50/115—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers comprising active inorganic nanostructures, e.g. luminescent quantum dots
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/80—Constructional details
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/10—OLED displays
    • H10K59/12—Active-matrix OLED [AMOLED] displays
    • H10K59/131—Interconnections, e.g. wiring lines or terminals
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/30—Devices specially adapted for multicolour light emission
    • H10K59/38—Devices specially adapted for multicolour light emission comprising colour filters or colour changing media [CCM]
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
    • H10K59/80—Constructional details
    • 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
    • G02F1/133614—Illuminating devices using photoluminescence, e.g. phosphors illuminated by UV or blue light
    • 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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/311—Flexible OLED
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K2102/00—Constructional details relating to the organic devices covered by this subclass
    • H10K2102/301—Details of OLEDs
    • H10K2102/331—Nanoparticles used in non-emissive layers, e.g. in packaging layer

Definitions

  • the present invention relates to the field of display technologies, and in particular, to a display panel.
  • Fig. 1 shows a thin film transistor liquid crystal display panel (TFT-LCD) of the prior art.
  • a thin film transistor liquid crystal display panel of the prior art includes a light bar 1, a light guide plate 2, a brightness enhancement film 3, a lower polarizer 4, an array substrate 5, a liquid crystal layer 6, a color filter substrate 7, and an upper polarizer 8. And a reflection sheet 9.
  • the steering of the liquid crystal molecules is controlled by controlling the voltage applied to the liquid crystal layer 6, so that the backlight module (including the light bar 1, the light guide plate 2, the brightness enhancement film 3, and the reflection sheet 9) is emitted and passed through the lower polarizer 4
  • the polarization direction of the linearly polarized light changes in angle.
  • Light passes through the color filter substrate 7 to form light of different colors. Since there is a different angle between the polarization direction of the light and the transmission axis of the upper polarizer 8, the intensity of the emitted light can be controlled to form a desired display picture.
  • the liquid crystal layer 6 itself cannot emit light, and the backlight module of the above form is required as a light source, which causes the color gamut of the liquid crystal display panel to be small.
  • FIG. 2 shows a prior art organic light emitting diode (OLED) display panel.
  • the OLED display panel of the prior art includes a glass substrate 10, an anode (the material of which is mainly indium tin oxide ITO) 11, a hole injection layer 12, a hole transport layer 13, and a blue organic light-emitting layer 14.
  • ITO indium tin oxide
  • the arrows indicate the outgoing light.
  • an organic light-emitting diode display panel of such a structure is required to successively evaporate three kinds of organic light-emitting materials of red, blue and green on a large-sized glass substrate.
  • Such a process yield is low, resulting in high cost of an organic light emitting diode (OLED) display panel.
  • a display panel which includes:
  • a wavelength conversion unit comprising quantum dots
  • the excitation light from the excitation light emitting unit enters the wavelength conversion unit, and the wavelength conversion unit converts the wavelength of the excitation light into a wavelength required for displaying a picture and then emits the light through the glass substrate.
  • the excitation light emitting unit and the wavelength conversion unit are each a layered structure on the same side of the glass substrate.
  • the wavelength conversion unit comprises a quantum dot film layer attached to the glass substrate. Since the half point width of the quantum dot excited light is narrow, the display panel according to the present invention can realize a wider color gamut than the liquid crystal display panel of the prior art.
  • the quantum dot film layer comprises a red quantum dot layer capable of emitting red light, a green quantum dot layer capable of emitting green light, and a blue quantum dot layer capable of emitting blue light.
  • the display panel according to the present invention has the characteristics of self-illumination, does not require a backlight module, and has a smaller thickness than the liquid crystal display panel of the prior art, and has a low dark state and high contrast.
  • the diameter of the quantum dots in the quantum dot film layer is in the range of 2-20 nm.
  • the quantum dot film layer is divided into a plurality of pixels, and at least one pixel includes three sub-pixels respectively corresponding to a red quantum dot layer, a green quantum dot layer, and a blue quantum dot layer.
  • different colors of red, green, and blue visible light are mixed to form a realistic image of one pixel.
  • the quantum dot comprises a core portion located inside, a shell portion located outside the core portion, and an organic ligand located outside the shell portion.
  • the core-shell structure facilitates the luminous efficiency of quantum dots
  • the organic ligand facilitates the mounting of quantum dots into the carrier material.
  • the excitation light is ultraviolet light having a wavelength in the range of 100-400 nm.
  • the excitation light emitting unit includes an anode electrode layer, a hole injection layer, a hole transport layer, an ultraviolet organic light emitting layer, an electron transport layer, which are disposed outwardly from adjacent to the quantum dot film layer,
  • An electron injection layer and a cathode electrode layer are capable of applying a voltage between the anode electrode layer and the cathode electrode layer.
  • the three-color organic light-emitting diode in the prior art requires three-layer organic light-emitting layer to be vapor-deposited over the entire surface, and one according to the present invention
  • the display panel in one embodiment only needs to vapor-deposit a layer of ultraviolet light organic light-emitting layer, which makes the process difficulty greatly reduced, the yield is improved, and the cost is reduced.
  • an ultraviolet light absorbing film is disposed on a side of the glass substrate remote from the excitation light emitting unit. In this way, excess UV light can be absorbed to avoid injury to the observer.
  • FIG. 1 is a schematic structural view of a thin film transistor liquid crystal display panel in the prior art
  • FIG. 2 is a schematic structural view of a display panel of an organic light emitting diode in the prior art
  • FIG. 3 is a schematic structural view of a display panel in accordance with an embodiment of the present invention.
  • FIG. 4 is a block diagram showing the structure of quantum dots in a display panel in accordance with an embodiment of the present invention.
  • FIG. 5 shows the light transmittance of the ultraviolet light absorbing film of the display panel and the light emission spectrum of the ultraviolet light organic light emitting layer according to an embodiment of the present invention
  • FIG. 6 shows a quantum dot excited light spectrum of a display panel in accordance with an embodiment of the present invention
  • Fig. 7 shows a color gamut comparison diagram of a display using a display panel in accordance with an embodiment of the present invention and a liquid crystal display of the prior art.
  • FIG. 3 shows a schematic structural view of a display panel in accordance with an embodiment of the present invention.
  • a display panel according to an embodiment of the present invention includes an excitation light emitting unit, a wavelength conversion unit including quantum dots, and a glass substrate 10.
  • the excitation light from the excitation light emitting unit enters the wavelength conversion unit, and the wavelength conversion unit converts the wavelength of the excitation light into a wavelength required for displaying a picture, and then emits the light through the glass substrate 10.
  • the arrows indicate the outgoing light.
  • the excitation light emitting unit and the wavelength conversion unit are both located on the same side of the glass substrate 10 (shown as the glass substrate 10 in FIG. 3) The layered structure of the upper side).
  • An ultraviolet light absorbing film 20 is provided on a side of the glass substrate 10 remote from the excitation light emitting unit (shown as a lower side of the glass substrate 10 in FIG. 3).
  • the wavelength conversion unit includes a quantum dot film layer attached to the glass substrate 10.
  • the quantum dot film layer includes a red quantum dot layer 22 capable of emitting red light, a blue quantum dot layer 23 capable of emitting blue light, and a green quantum dot layer 24 capable of emitting green light.
  • the diameter of the quantum dots in the quantum dot film layer ie, red quantum dot layer 22, blue quantum dot layer 23, and green quantum dot layer 24 is in the range of 2-20 nm.
  • the entire quantum dot film layer is divided into a plurality of pixels, and each pixel further includes three sub-pixels corresponding to the red quantum dot layer 22, the blue quantum dot layer 23, and the green quantum dot layer 24, respectively.
  • Quantum dot is a semiconductor structure with nanometer size. Unlike one-dimensional quantum wires, Quantum dots (QDs) have a zero-dimensional structure. Quantum dots (QD) can be in the range of 2-20 nm in diameter, and can convert short-wavelength waves into visible light of different colors (wavelengths) including the three primary colors of red, green, and blue according to the size of the quantum dots.
  • the quantum dots include a core portion 71 located inside, a shell portion 72 located outside the core portion 71, and an organic ligand 73 located outside the shell portion 72.
  • the core portion 71 can be fabricated, for example, by one or more of semiconductor materials such as ZnS, ZnO, GaN, ZnSe, etc.;
  • the shell portion 72 can be formed by one of oxides such as SiO, TiO, ZnO, SiO 2 or the like;
  • the ligand 73 may include a group of an organic substance such as COOH or NH 4 .
  • ultraviolet light 74 is drawn into a quantum dot to excite it, the quantum dot absorbs energy from ultraviolet light 74, and an energy level transition occurs from a relatively stable energy.
  • the stage transitions to a relatively unstable energy level, and then falls back from a relatively unstable energy level to a relatively stable energy level (eg, from an excited state to a ground state), releasing energy in the form of visible light during the fallback process.
  • Selecting the appropriate materials and structures allows the quantum dots to release red, green or blue visible light.
  • the excitation light is ultraviolet light having a wavelength in a range of 100 to 400 nm.
  • the excitation light emitting unit includes a yang disposed in order from adjacent to the quantum dot film layer (ie, the red quantum dot layer 22, the blue quantum dot layer 23, and the green quantum dot layer 24).
  • An ultraviolet light absorbing film 20 is also disposed on one side to absorb excess ultraviolet light.
  • Fig. 5 shows the light transmittance of the ultraviolet light absorbing film 20 of the display panel and the light emission spectrum of the ultraviolet light organic light emitting layer 21 according to an embodiment of the present invention.
  • the solid line indicates the light transmittance of the ultraviolet light absorbing film, and the broken line indicates the light emission spectrum of the ultraviolet light organic light emitting layer.
  • the abscissa is the wavelength, and the ordinate is correspondingly the transmittance or the relative light intensity.
  • FIG. 5 shows only one implementation of the ultraviolet light absorbing film 20 and the ultraviolet light organic light emitting layer 21, and a film layer having other light transmitting/emitting characteristics different from that shown in FIG. 5 can also be applied to the present invention. Proposed solution.
  • a voltage is first generated between the cathode electrode layer 19 and the anode electrode layer 11, and the electrons from the electron injection layer 18 are driven by the voltage.
  • the electron transport layer 17 enters the ultraviolet organic light-emitting layer 21, and holes (equivalently) from the hole injection layer 12 pass through the hole transport layer 13 to enter the ultraviolet light organic light-emitting layer 21, and electrons and holes are in ultraviolet light (UV).
  • the organic light-emitting layer 21 is composited to emit ultraviolet light (UV) (having a wavelength of, for example, in the range of 100 nm to 400 nm).
  • the ultraviolet light (UV) is incident on the quantum dot film layer (ie, the red quantum dot layer 22, the blue quantum dot layer 23, and the green quantum dot layer 24), and the quantum dots located in the quantum dot film layer are in ultraviolet (UV) light. Excited to emit different colors of visible light.
  • the intensity of the ultraviolet light emitted from the ultraviolet (UV) organic light-emitting layer 21 can be controlled. After the ultraviolet light enters the quantum dot layer, the quantum dots are excited to emit visible light (the wavelength of visible light depends on the size of the quantum dots in the quantum dot layer).
  • different colors of red, green, and blue visible light are mixed to form a realistic image of one pixel.
  • Excess ultraviolet light passes through the glass substrate 10 and enters the ultraviolet light absorbing film layer 20, where excess ultraviolet light is absorbed to prevent damage to the viewer.
  • the visible light of the three primary colors from the quantum dot film layer is mixed in each pixel to form a color required for the display screen of the panel and is emitted.
  • the display panel according to an embodiment of the present invention has advantages of self-luminous, high contrast, small thickness, and high color gamut.
  • Figure 6 shows a quantum dot excited light spectrum of a display panel in accordance with one embodiment of the present invention, with the abscissa being the wavelength and the ordinate being the relative light intensity.
  • the solid line indicates red light
  • the dotted line indicates green light
  • the broken line indicates blue light.
  • the display panel according to an embodiment of the present invention can reach the standard of 110% of the National Television System Committee (NTSC), and the prior art Intraoperative liquid crystal display panels (LCDs) can only meet the 70% NTSC standard.
  • the display panel according to an embodiment of the present invention has self-illuminating characteristics, does not require a backlight module, and has a thickness that is greatly reduced compared with a liquid crystal display panel (LCD) in the prior art, and has a low dark state brightness and high contrast.
  • Fig. 7 shows a color gamut comparison diagram of a display using a display panel in accordance with an embodiment of the present invention and a liquid crystal display of the prior art.
  • Figure 7 is a CIE chromaticity diagram.
  • the color gamut of the display using the display panel in one embodiment of the present invention is much wider than the color gamut of the prior art liquid crystal display (the area of the solid triangle) Larger than the area of the dotted triangle).
  • This advantageously demonstrates the advantage of a display panel having a wider color gamut in accordance with one embodiment of the present invention.
  • the display panel according to an embodiment of the present invention Compared with the three-color organic light emitting diode (OLED) display panel in the prior art, the display panel according to an embodiment of the present invention has the advantages of low difficulty in fabrication, low cost, high yield, and the like.
  • the three-color organic light emitting diode (OLED) in the prior art requires three-layer organic light-emitting layer to be vapor-deposited on the whole surface, and the display panel according to an embodiment of the present invention only needs to vapor-deposit a layer of ultraviolet light (UV).
  • UV ultraviolet light

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Mathematical Physics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
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Abstract

一种显示面板，其包括：激发光发射单元，包含量子点的波长转换单元，以及玻璃基板（10），来自所述激发光发射单元的激发光进入所述波长转换单元，所述波长转换单元将所述激发光的波长转换为显示画面所需的波长后使其经由所述玻璃基板（10）射出。该显示面板具有更宽色域的优势。

Description

一种显示面板
相关申请的交叉引用
本申请要求享有于2015年7月22日提交的名称为“一种显示面板”的中国专利申请CN201510432410.8的优先权，该申请的全部内容通过引用并入本文中。
技术领域
本发明涉及显示技术领域，尤其涉及一种显示面板。
背景技术
图1显示了现有技术中的薄膜晶体管液晶显示面板(TFT-LCD)。参照图1，现有技术中的薄膜晶体管液晶显示面板包括灯条1、导光板2、增亮膜3、下偏光片4、阵列基板5、液晶层6、彩膜基板7、上偏光片8以及反射片9。通过控制施加在液晶层6上的电压来控制液晶分子的转向，从而使由背光模组(包括灯条1、导光板2、增亮膜3和反射片9)发出并经过下偏光片4产生的线偏振光的偏振方向发生角度的改变。光透过彩膜基板7后形成不同颜色的光。由于光的偏振方向与上偏光片8的透光轴之间存在不同夹角，可以控制出射光的强弱，从而形成需要的显示画面。
在现有技术中的薄膜晶体管液晶显示面板中，液晶层6本身不能发光，需要上述形式的背光模组来作为光源，这造成液晶显示面板色域较小。
图2显示了现有技术中的有机发光二极管(OLED)显示面板。参照图2，现有技术中的有机发光二极管显示面板包括玻璃基板10、阳极(其材料主要为氧化铟锡ITO)11、空穴注入层12、空穴传输层13、蓝色有机发光层14、红色有机发光层15、绿色有机发光层16、电子传输层17、电子注入层18以及阴极19。箭头表示出射光。
制造这种结构的有机发光二极管显示面板，在实际的工艺中需要在大尺寸的玻璃基板上先后蒸镀红色、蓝色和绿色三种有机发光材料。这样的工艺过程良率低下，导致有机发光二极管(OLED)显示面板的成本居高不下。
发明内容
为了解决上述现有技术中的缺点，本申请提出了一种显示面板，其包括：
激发光发射单元，
包含量子点的波长转换单元，以及
玻璃基板，
来自所述激发光发射单元的激发光进入所述波长转换单元，所述波长转换单元将所述激发光的波长转换为显示画面所需的波长后使其经由所述玻璃基板射出。下文将给出的试验结果有利地证明了根据本发明的显示面板具有更宽色域的优势。
优选地，所述激发光发射单元和所述波长转换单元均为位于所述玻璃基板的同一侧的层状结构。
优选地，所述波长转换单元包括贴附在所述玻璃基板上的量子点膜层。由于量子点受激发光的半峰宽较窄，根据本发明的显示面板相较于现有技术中的液晶显示面板能实现较宽的色域。
优选地，所述量子点膜层包括能够发出红光的红色量子点层、能够发出绿光的绿色量子点层以及能够发出蓝光的蓝色量子点层。根据本发明的显示面板具有自发光的特性，不需要背光模组，厚度较现有技术中的液晶显示面板大大减小，暗态亮度低，对比度高。
优选地，所述量子点膜层中的量子点的直径位于2-20nm的范围内。
优选地，所述量子点膜层划分为多个像素，至少一个像素中包含三个分别与红色量子点层、绿色量子点层以及蓝色量子点层相对应的子像素。在一个像素中，不同强度的红色、绿色和蓝色三色的可见光混合，就组成了一个像素的现实图像。
优选地，所述量子点包括位于内部的核部、位于所述核部之外的壳部以及位于所述壳部之外的有机配位体。核壳结构有利于量子点的发光效率，有机配位体有利于将量子点安装到载体物质中。
优选地，所述激发光为波长位于100-400nm的范围内的紫外光。
优选地，所述激发光发射单元包括从相邻于所述量子点膜层处向外依次设置的阳电极层、空穴注入层、空穴传输层、紫外光有机发光层、电子传输层、电子注入层以及阴电极层，在所述阳电极层和所述阴电极层之间能够施加电压。现有技术中的三色有机发光二极管需要整面蒸镀三层有机发光层，而根据本发明的一 个实施例中的显示面板仅需要整面蒸镀一层紫外光的有机发光层，这使得制程难度将大大降低，良率提高，成本下降。
优选地，在所述玻璃基板的远离所述激发光发射单元的一侧设置有紫外光吸收膜。以此方式，可以吸收多余的紫外光，避免对观测者造成伤害。
上述技术特征可以各种适合的方式组合或由等效的技术特征来替代，只要能够达到本发明的目的。
附图说明
在下文中将基于实施例并参考附图来对本发明进行更详细的描述。其中：
图1显示了现有技术中的薄膜晶体管液晶显示面板的结构示意图；
图2显示了现有技术中的有机发光二极管显示面板的结构示意图；
图3显示了根据本发明的一个实施例中的显示面板的结构示意图；
图4显示了根据本发明的一个实施例中的显示面板中的量子点的结构示意图；
图5显示了根据本发明的一个实施例中的显示面板的紫外光吸收膜的透光率和紫外光有机发光层的发光光谱；
图6显示了根据本发明的一个实施例中的显示面板的量子点受激发光光谱；以及
图7显示了采用根据本发明的一个实施例中的显示面板的显示器和现有技术中的液晶显示器的色域对比图。
在附图中，相同的部件使用相同的附图标记。附图并未按照实际的比例。
具体实施方式
下面将结合附图对本发明作进一步说明。
图3显示了根据本发明的一个实施例中的显示面板的结构示意图。参照图3，根据本发明的一个实施例中的显示面板包括：激发光发射单元、包含量子点的波长转换单元，以及玻璃基板10。来自所述激发光发射单元的激发光进入所述波长转换单元，所述波长转换单元将所述激发光的波长转换为显示画面所需的波长后使其经由所述玻璃基板10射出。箭头表示出射光。所述激发光发射单元和所述波长转换单元均为位于所述玻璃基板10的同一侧(图3中显示为玻璃基板10的 上侧)的层状结构。在玻璃基板10的远离所述激发光发射单元的一侧(图3中显示为玻璃基板10的下侧)设置有紫外光吸收膜20。
所述波长转换单元包括贴附在所述玻璃基板10上的量子点膜层。具体地，所述量子点膜层包括能够发出红光的红色量子点层22、能够发出蓝光的蓝色量子点层23以及能够发出绿光的绿色量子点层24。在一个实施例中，所述量子点膜层(即红色量子点层22、蓝色量子点层23和绿色量子点层24)中的量子点的直径位于2-20nm的范围内。
具体地，整张量子点膜层划分为多个像素，每个像素中又包含三个分别与红色量子点层22、蓝色量子点层23以及绿色量子点层24相对应的子像素。
量子点(Quantum dot,QD)是一种具有纳米单位尺寸的半导体结构。与一维量子线不同，量子点(Quantum dot,QD)具有零维结构。量子点(Quantum dot,QD)的直径可位于2-20nm的范围内，并可以根据量子点的尺寸将短波长的波转变为包括红、绿、蓝三原色的不同颜色(波长)的可见光。
图4显示了根据本发明的一个实施例中的显示面板中的量子点的结构示意图。在图4中可以明显地看出，所述量子点包括位于内部的核部71、位于核部71之外的壳部72以及位于壳部72之外的有机配位体73。核部71例如可通过ZnS、ZnO、GaN、ZnSe等半导体材料中的一种或多种来制造；壳部72可通过SiO、TiO、ZnO、SiO2等氧化物中的一种来形成；有机配位体73可包括COOH、NH4等有机物的基团。核壳结构和有机配位体的设置可以增强量子点的发光效果。在根据本发明的一个实施例中的显示面板中，紫外光74摄入到量子点中对其进行激发，量子点吸收了来自紫外光74的能量，发生能级的跃迁，从相对稳定的能级跃迁到相对不稳定的能级，然后再从相对不稳定的能级回落到相对稳定的能级(例如由激发态回落至基态)，在回落的过程中释放出可见光形式的能量。选择适当的材料和结构，即可使量子点释放红色、绿色或蓝色的可见光。
在根据本发明的一个实施例中的显示面板中，上述激发光为波长位于100-400nm的范围内的紫外光。
再次参照图3，所述激发光发射单元包括从相邻于所述量子点膜层(即红色量子点层22、蓝色量子点层23和绿色量子点层24)处向外依次设置的阳电极层11、空穴注入层12、空穴传输层13、紫外光有机发光层21、电子传输层17、电子注入层18以及阴电极层19。另外，在玻璃基板10的远离所述激发光发射单元 的一侧还设置有紫外光吸收膜20，用以吸收多余的紫外光。
图5显示了根据本发明的一个实施例中的显示面板的紫外光吸收膜20的透光率和紫外光有机发光层21的发光光谱。其中实线表示紫外光吸收膜透光率，虚线表示紫外光有机发光层的发光光谱。横坐标为波长，纵坐标相应地为透光率或相对光强度。当然，图5仅仅显示了紫外光吸收膜20和紫外光有机发光层21的一种实现方式而已，具有不同于图5所示的其它透光/发光特性的膜层也可以应用于本发明所提出的方案。
再次参照图3，在根据本发明的一个实施例中的显示面板中，首先在阴电极层19和阳电极层11之间产生电压，在该电压的驱动下，来自电子注入层18的电子经过电子传输层17进入紫外光有机发光层21，来自空穴注入层12的空穴(等效地)经过空穴传输层13进入紫外光有机发光层21，电子与空穴在紫外光(UV)有机发光层21中复合，发出紫外光(UV)(其波长例如位于100nm-400nm的范围内)。该紫外光(UV)射入量子点膜层(即红色量子点层22、蓝色量子点层23和绿色量子点层24)，位于量子点膜层中的量子点在紫外光(UV)的激发下发出不同颜色的可见光。通过调节阴电极层19和阳电极层11之间的电压的大小，可控制紫外光(UV)有机发光层21所发出的紫外光的强弱。紫外光进入量子点层后，激发量子点发出可见光(可见光的波长取决于量子点层中量子点的大小)。在一个像素中，不同强度的红色、绿色和蓝色三色的可见光混合，就组成了一个像素的现实图像。多余的紫外光经过玻璃基板10后进入紫外光吸收膜层20，多余的紫外光在此被吸收，以防对观看者造成伤害。而来自量子点膜层的三原色的可见光在每个像素中混合，形成面板的显示画面所需要的颜色并射出。
相较于现有技术中的液晶显示面板，根据本发明的一个实施例中的显示面板具有自发光、对比度高、厚度小以及色域高等优点。
图6显示了根据本发明的一个实施例中的显示面板的量子点受激发光光谱，横坐标为波长，纵坐标为相对光强度。在图中，实线表示红光，点划线表示绿光，虚线表示蓝光。
图6直观地反映了：量子点受激发光的半峰宽较窄，因此相较于现有技术中的液晶显示面板(LCD)能实现较宽的色域。
经测试，根据本发明的一个实施例中的显示面板可达到110％美国国家电视系统委员会(National Television System Committee,NTSC)的制式标准，而现有技 术中的液晶显示面板(LCD)仅能达到70％NTSC的制式标准。且根据本发明的一个实施例中的显示面板具有自发光的特性，不需要背光模组，厚度较现有技术中的液晶显示面板(LCD)大大减小，暗态亮度低，对比度高。
图7显示了采用根据本发明的一个实施例中的显示面板的显示器和现有技术中的液晶显示器的色域对比图。图7为CIE色度图。在图7中可以非常明显地看出，采用根据本发明的一个实施例中的显示面板的显示器的色域相比于现有技术中的液晶显示器的色域要宽广许多(实线三角形的面积比虚线三角形的面积大许多)。这有利地证明了根据本发明的一个实施例中的显示面板具有更宽色域的优势。
相较于现有技术中的三色有机发光二极管(OLED)显示面板，根据本发明的一个实施例中的显示面板具有制成难度低、成本低、良率高等优点。现有技术中的三色有机发光二极管(OLED)需要整面蒸镀三层有机发光层，而根据本发明的一个实施例中的显示面板仅需要整面蒸镀一层紫外光(UV)的有机发光层，这使得制程难度将大大降低，良率提高，成本下降。
虽然在本文中参照了特定的实施方式来描述本发明，但是应该理解的是，这些实施例仅仅是本发明的原理和应用的示例。因此应该理解的是，可以对示例性的实施例进行许多修改，并且可以设计出其他的布置，只要不偏离所附权利要求所限定的本发明的精神和范围。应该理解的是，可以通过不同于原始权利要求所描述的方式来结合不同的从属权利要求和本文中所述的特征。还可以理解的是，结合单独实施例所描述的特征可以使用在其他所述实施例中。

Claims (10)

  1. 一种显示面板，其中，包括：
    激发光发射单元，
    包含量子点的波长转换单元，以及
    玻璃基板，
    来自所述激发光发射单元的激发光进入所述波长转换单元，所述波长转换单元将所述激发光的波长转换为显示画面所需的波长后使其经由所述玻璃基板射出。
  2. 根据权利要求1所述的显示面板，其中，所述激发光发射单元和所述波长转换单元均为位于所述玻璃基板的同一侧的层状结构。
  3. 根据权利要求2所述的显示面板，其中，所述波长转换单元包括贴附在所述玻璃基板上的量子点膜层。
  4. 根据权利要求3所述的显示面板，其中，所述量子点膜层包括能够发出红光的红色量子点层、能够发出绿光的绿色量子点层以及能够发出蓝光的蓝色量子点层。
  5. 根据权利要求4所述的显示面板，其中，所述量子点膜层中的量子点的直径位于2-20nm的范围内。
  6. 根据权利要求4所述的显示面板，其中，所述量子点膜层划分为多个像素，至少一个像素中包含三个分别与红色量子点层、绿色量子点层以及蓝色量子点层相对应的子像素。
  7. 根据权利要求4所述的显示面板，其中，所述量子点包括位于内部的核部、位于所述核部之外的壳部以及位于所述壳部之外的有机配位体。
  8. 根据权利要求1所述的显示面板，其中，所述激发光为波长位于100-400nm的范围内的紫外光。
  9. 根据权利要求8所述的显示面板，其中，所述激发光发射单元包括从相邻于所述量子点膜层处向外依次设置的阳电极层、空穴注入层、空穴传输层、紫外光有机发光层、电子传输层、电子注入层以及阴电极层，在所述阳电极层和所述阴电极层之间能够施加电压。
  10. 根据权利要求8所述的显示面板，其中，在所述玻璃基板的远离所述激 发光发射单元的一侧设置有紫外光吸收膜。
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