WO2018201619A1 - 一种背光模组和显示设备 - Google Patents

一种背光模组和显示设备 Download PDF

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Publication number
WO2018201619A1
WO2018201619A1 PCT/CN2017/093258 CN2017093258W WO2018201619A1 WO 2018201619 A1 WO2018201619 A1 WO 2018201619A1 CN 2017093258 W CN2017093258 W CN 2017093258W WO 2018201619 A1 WO2018201619 A1 WO 2018201619A1
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Prior art keywords
light
backlight module
type
quantum dot
light conversion
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Application number
PCT/CN2017/093258
Other languages
English (en)
French (fr)
Inventor
常建宇
李泳锐
萧宇均
张简圣哲
苏赞加
Original Assignee
深圳市华星光电技术有限公司
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Application filed by 深圳市华星光电技术有限公司 filed Critical 深圳市华星光电技术有限公司
Priority to US15/558,185 priority Critical patent/US10591776B2/en
Publication of WO2018201619A1 publication Critical patent/WO2018201619A1/zh

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    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0053—Prismatic sheet or layer; Brightness enhancement element, sheet or layer
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0033—Means for improving the coupling-out of light from the light guide
    • G02B6/005—Means for improving the coupling-out of light from the light guide provided by one optical element, or plurality thereof, placed on the light output side of the light guide
    • G02B6/0055—Reflecting element, sheet or layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00634—Production of filters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133606—Direct backlight including a specially adapted diffusing, scattering or light controlling members
    • G02F1/133607—Direct backlight including a specially adapted diffusing, scattering or light controlling members the light controlling member including light directing or refracting elements, e.g. prisms or lenses
    • 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
    • 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
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side
    • 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
    • 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
    • G02F2203/00—Function characteristic
    • G02F2203/09—Function characteristic transflective

Definitions

  • the present invention relates to the field of liquid crystal panel display technologies, and in particular, to a backlight module and a display device.
  • Liquid crystal display has the characteristics of light weight, low power consumption, no radiation, etc. It has occupied the leading position in the field of flat display.
  • liquid crystal display is widely used in high definition digital TV, desktop computer, tablet computer and notebook.
  • electronic devices such as computers, mobile phones, and digital cameras.
  • the inventor of the present application found in the long-term research and development that when the backlight passes through a polarizer, a TFT, etc., the output light has directionality, and most of the light is emitted vertically from the screen;
  • the different positions of the LCD display will have different colors. Especially when viewing the LCD from a large angle, you can't see the original color of the picture, or even see all white or all black, which is often said.
  • the problem of insufficient perspective As LCDs become larger and larger, the probability of viewing the display from the side is increasing, so there is an urgent need to develop display devices having a wide viewing angle.
  • the technical problem to be solved by the present invention is to provide a backlight module and a display device, which can make the display device have a larger viewing angle and achieve a better display effect.
  • a technical solution adopted by the present invention is to provide a backlight module, comprising: a light source, emitting at least a first type of light; at least two pieces of light conversion film, wherein at least one of the light conversion films is received The first light is converted into at least a second light, such that the light output angle of the backlight module matches a wide viewing angle greater than 120 degrees; the color temperature is less than 16000, and the contrast is greater than 1500:1; the light conversion film includes a light conversion material, and the light conversion The concentration of the material in the light conversion film is 0.2% to 25%; and the film thickness of the light conversion material layer is 70 to 135 ⁇ m.
  • a technical solution adopted by the present invention is to provide a backlight module, comprising: a light source, emitting at least a first type of light; at least two pieces of light conversion film, wherein at least one of the light conversion films is received The first type of light is converted into at least a second type of light, such that the light exit angle of the backlight module matches the wide viewing angle display requirement.
  • another technical solution adopted by the present invention is to provide a display device, the display device includes a backlight module, and the backlight module includes a light source to emit at least a first type of light; At least two light conversion films, wherein at least one of the light conversion films receives the first light and converts it into at least a second light, so that the light output angle of the backlight module matches the wide viewing angle display requirement.
  • the backlight module includes at least two light conversion films, which can enhance the scattering of light by at least two light conversion films, which is different from the prior art.
  • the light-emitting angle of the large backlight module further enables the display device with the backlight module to achieve a wide viewing angle effect; at the same time, it has at least two light-converting films, which can reflect a part of the light while scattering the light, and then excite the light again, thereby improving Light utilization, enhanced brightness, and better display.
  • FIG. 1 is a schematic structural view of an embodiment of a backlight module of the present invention
  • FIG. 2 is a comparison view of brightness angles of a backlight module of the present invention and a conventional backlight module;
  • FIG. 3 is a schematic structural view of each light direction in an embodiment of a backlight module of the present invention.
  • FIG. 4 is a schematic structural view of another embodiment of a backlight module of the present invention.
  • FIG. 5 is a schematic view showing directions of light rays in still another embodiment of the backlight module of the present invention.
  • FIG. 6 is a schematic structural view of an embodiment of a display device of the present invention.
  • FIG. 1 is a schematic structural view of an embodiment of a backlight module of the present invention.
  • the invention provides a backlight module for providing a backlight source for a display device.
  • the backlight module includes a light source 101 and at least two pieces of light conversion film 102.
  • the light source 101 is a point light source, a line light source or a surface light source, and can emit at least a first type of light; the light source 101 can be a Light Emitting Diode (LED) lamp, which can emit light of various colors, such as ultraviolet light or blue light. . In other embodiments, the backlight source may also be other illuminable chips or the like.
  • LED Light Emitting Diode
  • FIG. 2 is a comparison diagram of brightness perspectives of the backlight module of the present invention and a conventional backlight module.
  • At least one of the light conversion films 1021 or 1022 receives the first light and converts it into at least a second light, so that the light output angle of the backlight module matches the wide viewing angle display requirement.
  • the wide viewing angle matched by the light extraction angle of the backlight module is greater than 120 degrees, for example, 120 degrees, 150 degrees, 170 degrees, etc., which can meet the requirements of wide viewing angle display. And can Make the display device achieve a wide viewing angle effect.
  • the light conversion film 1021 or 1022 includes a light conversion material, and the concentration of the light conversion material in the light conversion film 1021 or 1022 is 0.2% to 25%, wherein the concentration may be a mass content or a volume content, specifically The material, the density, the particle size of the light conversion material, the type of the material of the base material, and the like are adjusted, and the concentration in other embodiments may also be a mass content or a volume content. As the concentration of the light conversion material increases, the color temperature of the backlight module will decrease. Therefore, in order to reduce the color temperature of the backlight module, the concentration of the light conversion material can be appropriately increased, for example, 0.2%, 1%, 6%, 13%. 25%, etc., so that the color temperature of the backlight module is reduced to below 16000, such as 14000, 11000, 9000, 7000, and the like.
  • the backlight module provided by the present application has a large viewing angle and a low color temperature, and the contrast ratio thereof is greater than 1500:1, for example, 1500:1, 3000:1, 5000:1, and the like.
  • the first light is ultraviolet light or blue light
  • the second light is yellow light, or a mixed light of green light and red light, or a mixed light of blue light, green light and red light
  • the third light It is red light.
  • At least two pieces of the light conversion film 102 respectively convert the first light into the second light of the same or different wavelengths.
  • the light conversion film 102 receives the blue light excitation to emit a second light composed of a mixture of green light and red light of different wavelengths, or the light conversion film 102 receives the blue light excitation and emits the same wavelength.
  • the yellow light acts as the second light; when the first light is violet, the light conversion film 102 receives the violet light and emits a second light composed of a mixture of blue, green, and red light of different wavelengths.
  • one of the at least two pieces of the light conversion film 202 converts the first light into the second light, and the other light conversion film 2021 or 2022 will be the second.
  • the light is converted into a third type of light.
  • the first light is blue light
  • the light conversion film 2021 receives the blue light excitation to emit a second light composed of a mixture of green light and red light of different wavelengths
  • the light conversion film 2022 receives the green light in the second light.
  • the excitation emits red light having the same wavelength as the third light.
  • FIG. 3 is a schematic diagram of respective light directions in an embodiment of the backlight module of the present invention.
  • two pieces of light conversion film 202 are stacked, a part of the first light passes through one piece of light conversion film 2021 and is emitted to the other piece of light conversion film 2022, and is partially reflected back to continue to convert the first type of light.
  • the two light-converting films arranged in a stack can reflect a part of the light while scattering the light, and then excite the light again, improve the light utilization efficiency, enhance the brightness, and have a better display effect.
  • two pieces of light conversion film can also be arranged side by side, that is to say The light passes through only one light conversion film. With this arrangement, the light does not need to pass through the multilayer optical film, and has a large light exit angle, thereby achieving a wider viewing angle.
  • part of the blue light (B) is absorbed by the light conversion material through the light conversion film 2021 to generate red light (R) and green light (G); the generated red light and green light and part of blue light are transmitted through the light.
  • the film 2022 is mixed to generate white light for providing backlight; another portion of the blue light passes through the light conversion film 2021 and is emitted to the light conversion film 2022, and is absorbed by the light conversion material in the light conversion film 2022 to generate red light (R) and green light ( G); a part of the blue light is reflected back and then re-excited by the light conversion material in the light conversion film 2021 to increase the number of excitations and improve the light utilization efficiency.
  • the light conversion film 202 includes a light conversion material layer having a film thickness of 70 to 135 micrometers, for example, 75 micrometers, 95 micrometers, 115 micrometers, and 135 micrometers, and the film layer is too Thickness increases the consumption and loss of light, and the film layer is too thin and the light conversion rate is lowered.
  • the thickness of the light conversion material layer can be appropriately increased.
  • the light conversion film 202 comprises a quantum dot material and/or a fluorescent material.
  • Quantum Dot refers to a granular material whose three-dimensional size is on the order of nanometers.
  • QD Quantum Dot
  • the luminescence spectrum of QD is mainly controlled by the particle size of QD. Therefore, the luminescence spectrum can be adjusted by changing the particle size of QD.
  • the QD conversion efficiency is high, which can improve the utilization of light.
  • the emission spectrum of QD has a narrow half-wave width and good temperature stability.
  • the material of the quantum dot may be a group II-VI quantum dot material, a group I-III-VI quantum dot material, or a mixture of different quantum dot materials; specifically, the quantum dot material may be ZnCdSe 2 , CdSe, CdTe, CuInS 2 , one or more of ZnCuInS 3 .
  • the size, material, and type of fluorescent material of the quantum dot can be selectively adjusted according to actual needs.
  • the ratio of the quantum dot material to the fluorescent material is 1:100 to 1:5, for example, 1:100, 1:70, 1:40, 1:20, 1:5, etc., quantum
  • the light conversion efficiency of the point material is higher than that of the ordinary fluorescent material, but the price of the quantum dot material is higher than that of the ordinary fluorescent material. If the whole piece of the light conversion film is selected from the quantum dot material, the preparation cost is increased, and the light conversion efficiency reaches a certain level. After the value, even if the amount of quantum dot material is increased, the final display effect is not greatly affected, resulting in waste of resources; therefore, in this embodiment, the combination of the quantum dot material and the fluorescent material is used to ensure the light conversion efficiency. It also saves costs.
  • the quantum dot material has a particle diameter of 1 to 20 nm, for example, 1 nm, 5 nm, 8 nm, 15 nm, 20 nm, etc.; the quantum dot material includes a blue quantum dot material, a green quantum dot material, and a red color.
  • Light quantum dot material wherein when a non-blue light source such as an ultraviolet light source is used, the concentration of the blue quantum dot material in the quantum dot material is 40% to 65%, for example, 40%, 45%, 50%, 55%, 65%.
  • the concentration of the green light quantum dot material in the quantum dot material is 15% to 45%; for example, 15%, 25%, 35%, 40%, 45%, etc.; the concentration of the red light quantum dot material in the quantum dot material is 12% to 28%; for example: 12%, 15%, 18%, 22%, 28%, etc.; the ratio of green light quantum dot material to red light quantum dot material is 3:1 to 1.2:1; for example, 3:1, 2.5 1: 1, 2: 1, 1.5: 1, etc.
  • the blue quantum dot material may not be included, and the green light quantum dot material and the red light quantum dot material may be adjusted and distributed according to the above ratio.
  • the particle size distribution of the quantum dot material should be uniform to improve the light purity, and the blue quantum dot material is mainly used for absorbing the first light to convert it into the second light, for example, converting into green light and red light, so the content thereof More; while green light is easily absorbed and converted into red light, so in order to make the final white light more uniform, the content of green light quantum dot material should be more than the amount of red light quantum dot material, so that the last three kinds of light in white light The ratio is about 10% to 30% of blue light, 30% to 70% of green light, and 20% to 40% of red light.
  • the backlight module can only include two pieces of light conversion films 1021 and 1022, without requiring other prism films, diffusion films, brightness enhancement films, etc., the preparation process is simple, and the display device is thinner.
  • three or five sheets of light conversion films may be included to enhance light utilization, and may also be used in combination with other films.
  • the backlight module further includes a prism sheet disposed on a side of the at least two pieces of the light conversion film 102 on the optical path away from the light source 101, for concentrating the light only in a vertical viewing angle;
  • the sheet and the prism sheet concentrate the light only in a vertical viewing angle, which can increase the viewing angle in the horizontal direction, and can also improve the brightness of the light to achieve a better display effect.
  • the backlight module further includes: a brightness enhancement film disposed on a side of the at least two light conversion films 102 on the optical path away from the light source 101, configured to transmit another polarized light through one polarized light. .
  • the other polarized light that is reflected returns to the second optical film 103 to continue the light conversion, thereby further increasing the degree of light conversion, thereby enhancing the brightness intensity and achieving a better display effect.
  • the backlight module may include both the prism sheet and the brightness enhancement sheet, or only one of them.
  • no prism sheet may be disposed on the optical path of the light conversion film away from the light source 101, thereby avoiding the natural characteristics that affect the light output angle of the light conversion film itself; No prism sheet is placed on the side of the light path of the film exchange adjacent to the light source 101, because the effect of the prism sheet collecting light is also affected by the light conversion film.
  • FIG. 4 is a schematic structural view of another embodiment of the backlight module of the present invention
  • FIG. 5 is a schematic view of each light direction in another embodiment of the backlight module of the present invention.
  • the backlight module further includes: a first transflective film 303 disposed on a side of the light path adjacent to the light source 301 on at least two pieces of the light conversion film 302, transmitting the first light and reflecting the first light
  • the outer light is disposed on at least two of the light transmissive films 302 on the optical path away from the side of the light source 301, at least partially reflecting the first light and transmitting the light other than the first light.
  • the first light can be selectively transmitted to improve the purity of the first light and enhance the excitation efficiency; and by providing the second transflective film, the light other than the first light can be transmitted through
  • the white light is formed to provide a backlight source; and at the same time, the first light is partially reflected, and the second light is excited again to improve the utilization of the first light and enhance the brightness.
  • the first transflective film 303 can transmit blue light (B) and reflect light other than blue light; the blue light is absorbed by the light conversion material to generate red light (R) and green light (G).
  • the generated red and green light and part of the blue light can be mixed through the second transflective film 304 to generate white light for providing backlight; the generated part of the red and green light cannot be reflected back through the first transflective film 303.
  • re-exit improve light utilization; at the same time, part of the blue light is reflected back and then re-excited by the light conversion material absorption, increasing the number of excitations and improving light utilization.
  • the backlight module can also provide a backlight source for the display device as a direct-lit light source.
  • FIG. 6 is a schematic structural diagram of an embodiment of a display device according to the present invention.
  • the present invention provides a display device, which includes a backlight module 501 and a liquid crystal display panel 502.
  • the structure of the backlight module 501 is the same as that in the above embodiment, and is not described herein again; the structure of the liquid crystal display panel 502 is a conventional structure.
  • the backlight module of the display device has a large light-emitting angle, so that the display device has a larger viewing angle and the display effect is better.
  • the present invention provides a backlight module including at least two light conversion films, which can enhance light scattering by at least two light conversion films, increase the light exit angle of the backlight module, and thereby achieve a wide viewing angle.
  • a backlight module including at least two light conversion films, which can enhance light scattering by at least two light conversion films, increase the light exit angle of the backlight module, and thereby achieve a wide viewing angle.
  • it has at least two light-converting films, which can reflect a part of the light while scattering the light, and then excite the light again, improve the light utilization rate, enhance the brightness, and have better display effect. fruit.

Abstract

一种背光模组(501)和显示设备，所述背光模组包括光源(101,301)，发出至少第一种光线；至少两片光转换膜(102,1021,1022,202,2021,2022,302,3021,3022)，其中至少一片光转换膜(1021,1022,2021,2022,3021,3022)接收第一种光线并将其转换为至少第二种光线出射，使得背光模组(501)的出光角度匹配广视角显示要求。其能够增大背光模组(501)的出光角度，进而达到广视角效果；同时具有至少两片光转换膜(102,1021,1022,202,2021,2022,302,3021,3022)，在散射出光的同时还能反射一部分光回来，再次进行激发出光，提高光利用率，增强光亮度，拥有更好的显示效果。

Description

一种背光模组和显示设备 【技术领域】
本发明涉及液晶面板显示技术领域，特别是涉及一种背光模组和显示设备。
【背景技术】
液晶显示器(Liquid Crystal Display，LCD)具有轻薄、功耗低、无辐射等特点，现已占据了平面显示领域的主导地位，目前液晶显示器被广泛应用于高清数字电视、台式电脑、平板电脑、笔记本电脑、手机、数码相机等电子设备中。
本申请的发明人在长期的研发中发现现有技术中当背光源通过偏光片、TFT等之后，输出的光线便具有了方向性，其中大多数光是从屏幕中垂直射出来的；即在液晶显示器的不同位置看画面会有不同的色彩，特别是当从一较大角度来观看LCD时，便不能看到画面原本的颜色，甚至只能看到全白或全黑，也就是常说的视角不足的问题。随着LCD尺寸越来越大，从侧面观看显示屏的概率越来越大，因此亟待需要研发具有广视角的显示设备。
【发明内容】
本发明主要解决的技术问题是提供一种背光模组和显示设备，能够使显示设备具有较大的视角，达到更好的显示效果。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种背光模组，该背光模组包括光源，发出至少第一种光线；至少两片光转换膜，其中至少一片光转换膜接收第一种光线并将其转换为至少第二种光线出射，使得背光模组的出光角度匹配广视角大于120度；色温小于16000，对比度大于1500∶1；光转换膜包括光转换材料，光转换材料在光转换膜中的浓度为0.2％～25％；光转换材料层的膜厚度为70～135微米。
为解决上述技术问题，本发明采用的一个技术方案是：提供一种背光模组，该背光模组包括光源，发出至少第一种光线；至少两片光转换膜，其中至少一片光转换膜接收第一种光线并将其转换为至少第二种光线出射，使得背光模组的出光角度匹配广视角显示要求。
为解决上述技术问题，本发明采用的另一个技术方案是：提供一种显示设备，该显示设备包括背光模组，该背光模组包括光源，发出至少第一种光线； 至少两片光转换膜，其中至少一片光转换膜接收第一种光线并将其转换为至少第二种光线出射，使得背光模组的出光角度匹配广视角显示要求。
本发明的有益效果是：区别于现有技术的情况，本发明提供一种背光模组，该背光模组包括至少两片光转换膜，通过至少两片光转换膜能够增强光的散射，增大背光模组的出光角度，进而使具有该背光模组的显示设备达到广视角效果；同时具有至少两片光转换膜，在散射出光的同时还能反射一部分光回来，再次进行激发出光，提高光利用率，增强光亮度，拥有更好的显示效果。
【附图说明】
图1是本发明背光模组一实施方式的结构示意图；
图2是本发明背光模组与普通背光模组的亮度视角的对比图；
图3是本发明背光模组一实施方式中各光线方向的结构示意图
图4是本发明背光模组另一实施方式的结构示意图；
图5是本发明背光模组又一实施方式中各光线方向的示意图；
图6是本发明显示设备一实施方式的结构示意图。
【具体实施方式】
为使本发明的目的、技术方案及效果更加清楚、明确，以下参照附图并举实施例对本发明进一步详细说明。
请参阅图1，图1是本发明背光模组一实施方式的结构示意图。本发明提供一种背光模组用于为显示设备提供背光光源。该背光模组包括：光源101、至少两片光转换膜102。
光源101是点光源、线光源或面光源，能够发出至少第一种光线；光源101可以是发光二极管(Light Emitting Diode，LED)灯，该LED灯可以发出多种颜色光线，例如紫外光或蓝光。在其他实施方式中，背光光源也可以是其他可发光芯片等。
请参阅图2，图2是本发明背光模组与普通背光模组的亮度视角的对比图。至少一片光转换膜1021或1022接收第一种光线并将其转换为至少第二种光线出射，使得背光模组的出光角度匹配广视角显示要求。经过至少两片光转换膜102对第一光线进行转换散射后，背光模组的出光角度所匹配的广视角将大于120度，例如120度、150度、170度等，能够满足广视角显示要求，进而能够 使显示设备达到广视角效果。
其中，光转换膜1021或1022包含光转换材料，光转换材料在光转换膜1021或1022中的浓度为0.2％～25％，其中，该浓度可以是质量含量也可以是体积含量，具体可根据光转换材料的材质、密度、粒径大小，基体材料的材质种类等进行调配，其他实施方式中的浓度同样也可以是质量含量或体积含量。随着光转换材料的浓度增加，背光模组的色温将降低，因此，为了降低背光模组的色温，可以适当增大光转换材料的浓度，例如：0.2％、1％、6％、13％、25％等，使得背光模组的色温降到16000以下，例如14000、11000、9000、7000等。
可选地，在一实施方式中，本申请所提供的背光模组在具有大视角，低色温的同时，其对比度还大于1500∶1，例如1500∶1、3000∶1、5000∶1等。
其中，可选地，第一种光线是紫外光或蓝光，第二种光线是黄光，或绿光和红光的混合光，或蓝光、绿光和红光的混合光，第三种光线是红光。
其中，至少两片光转换膜102分别将第一种光线转换为相同或不同波长的第二种光线出射。具体地，当第一种光线为蓝光时，光转换膜102接收蓝光激发发出由不同波长的绿光和红光混合组成的第二种光线，或者光转换膜102接收蓝光激发发出具有同一波长的黄光作为第二种光线；当第一种光线为紫光时，光转换膜102接收紫光激发发出由不同波长的蓝光、绿光和红光混合组成的第二种光线。
可选地，在一实施方式中，至少两片光转换膜202中的一片光转换膜2021或2022将第一种光线转换为第二种光线出射，另一片光转换膜2021或2022将第二种光线转换为第三种光线出射。具体地，当第一种光线为蓝光时，光转换膜2021接收蓝光激发发出由不同波长的绿光和红光混合组成的第二种光线，光转换膜2022接收第二种光线中的绿光激发发出具有同一波长的红光作为第三种光线。
请参阅图3，图3是本发明背光模组一实施方式中各光线方向的示意图。在该实施方式中，两片光转换膜202层叠设置，部分第一种光线通过一片光转换膜2021并出射至另一片光转换膜2022上，并且部分被反射回以继续将第一种光线转换为第二种光线。通过层叠设置的两片光转换膜在散射出光的同时还能反射一部分光回来，再次进行激发出光，提高光利用率，增强光亮度，拥有更好的显示效果。在另一实施方式中，两片光转换膜也可以并排设置，也即是说 光线只经过一片光转换膜，通过这种设置，光线无需经过多层光学膜，拥有较大的出光角度，进而达到更广的视角。
以蓝光光源为例，部分蓝光(B)通过光转换膜2021被光转换材料吸收激发产生红光(R)和绿光(G)；所生成的红光和绿光及部分蓝光透过光转换膜2022混合生成白光，用以提供背光；另一部分蓝光通过光转换膜2021并出射至光转换膜2022上，被光转换膜2022中的光转换材料吸收激发产生红光(R)和绿光(G)；又一部分蓝光被反射回来后重新被光转换膜2021中的光转换材料吸收再次激发，增加激发次数，提高光利用率。
可选地，在一实施方式中，光转换膜202包括光转换材料层，光转换材料层的膜厚度为70～135微米，例如：75微米、95微米、115微米、135微米，膜层太厚会增加光的消耗和损失，膜层太薄光转换率会降低。同时，随着膜厚度的增加，背光模组的色温将降低，因此，为了降低背光模组的色温，可以适当增加光转换材料层的厚度。
可选地，在一实施方式中，光转换膜202包含量子点材料和/或荧光材料。其中，量子点(Quantum Dot，QD)是指三维尺寸均在纳米量级的颗粒材料，量子点在收到光照射时可以进入激发态，并在由激发态回落为基态时发出特定波长(即特定颜色)的光，QD的发光光谱主要由QD的粒径大小来控制，因此可以通过改变QD的粒径来实现发光光谱的调节；同时，QD转换效率很高，可以提高光的利用率，QD的发射光谱半波宽很窄，温度稳定性好。量子点的材质可以是II-VI族量子点材料，I-III-VI族量子点材料，还可以是不同量子点材料的混合物；具体地，量子点材料可以是ZnCdSe2，CdSe，CdTe，CuInS2，ZnCuInS3中的一种或多种。量子点的尺寸大小、材质、荧光材料的种类等可以根据实际需要选择性调配。
可选地，在一实施方式中，量子点材料与荧光材料的比例为1∶100～1∶5，例如1∶100、1∶70、1∶40、1∶20、1∶5等，量子点材料的光转换效率比普通荧光材料高，但量子点材料的价格比普通荧光材料贵，如果整片光转换膜全部选用量子点材料，会使得制备成本升高，且在光转换效率达到一定值后，即使再增加量子点材料的量，对最终显示效果影响并不大，造成资源的浪费；因此，该实施方式中，选用量子点材料与荧光材料的组合，既能保证光转换效率，还节约成本。
可选地，在一实施方式中，量子点材料的粒径为1～20纳米，例如：1nm、5nm、8nm、15nm、20nm等；量子点材料包括蓝光量子点材料、绿光量子点材料、红光量子点材料，其中，当使用紫外光源等非蓝光光源时，蓝光量子点材料在量子点材料中的浓度为40％～65％，例如：40％、45％、50％、55％、65％等；绿光量子点材料在量子点材料中的浓度为15％～45％；例如：15％、25％、35％、40％、45％等；红光量子点材料在量子点材料中的浓度为12％～28％；例如：12％、15％、18％、22％、28％等；绿光量子点材料与红光量子点材料的比例为3∶1～1.2∶1；例如3∶1、2.5∶1、2∶1、1.5∶1等。当使用蓝光光源时，可以不包含蓝光量子点材料，绿光量子点材料与红光量子点材料可以根据上述比例进行调整分配。其中，量子点材料的粒径分布应当均匀，以提高光纯度，蓝光量子点材料主要用于吸收第一种光线将其转换为第二种光线，例如转换为绿光和红光，所以其含量较多；而绿光又容易被吸收转换为红光，所以为了使最后所出射的白光较均匀，绿光量子点材料的含量应当多于红光量子点材料的量，使得最后白光中三种光线的比例大约为蓝光10％～30％、绿光30％～70％、红光20％～40％。
可选地，在一实施方式中，背光模组可以只包含两片光转换膜1021和1022，而不需要其他的棱镜膜，扩散膜、增亮膜等，制备工艺简单，使显示设备更薄、节约成本，在其他实施方式中也可以包括三片、五片等更多片光转换膜，以增强光利用率，还可以与其他膜片结合使用。
可选地，在一实施方式中，背光模组还包括设置于至少两片光转换膜102在光路上远离光源101一侧的棱镜片，用于仅在垂直视角对光线进行汇聚；通过设置棱镜片，且该棱镜片只在垂直视角对光线进行汇聚，既能在水平方向增大视角，还能提高光亮度，达到更好的显示效果。
可选地，在一实施方式中，背光模组还包括：设置于至少两片光转换膜102在光路上远离光源101一侧的增亮片，用于透过一偏振光而反射另一偏振光。被反射的另一偏振光返回第二光学膜103继续进行光转换，从而进一步提高光转换的程度，进而能够增强光亮强度，达到更好的显示效果。
可选地，在一实施方式中，背光模组可以同时包括棱镜片和增亮片，也可以只包含其中一个。
当然，在一实施方式中，可以在光转换膜的光路上远离光源101一侧不设置任何棱镜片，避免影响光转换膜本身出光角度大的天然特性；同样，在光转 换膜的光路上邻近光源101一侧也不设置任何棱镜片，因为棱镜片汇聚光线的效果也会被光转换膜影响。
请参阅图4和图5，图4是本发明背光模组另一实施方式的结构示意图；图5是本发明背光模组又一实施方式中各光线方向的示意图。在一实施方式中，背光模组还包括：设置于至少两片光转换膜302在光路上邻近光源301一侧的第一透反膜303，透过第一种光线并反射除第一种光线外的光线；设置于至少两片光转换膜302在光路上远离光源301一侧的第二透反膜304，至少部分反射第一种光线并透过除第一种光线外的光线。通过设置第一透反膜，能够选择性透过第一种光线，提高第一光线的纯度，增强激发效率；通过设置第二透反膜，能够透过除第一种光线外的光线，以形成白光提供背光光源；且同时能够部分反射第一种光线，再次激发生成第二种光线，以提高第一种光线的利用率，增强光亮度。在另一实施方式中也可以只在至少两片光转换膜在光路上远离光源的一侧设置透反膜。
以蓝光光源为例，第一透反膜303可以透过蓝光(B)，并反射除蓝光以外的光线；蓝光经过光转换材料被吸收激发产生红光(R)和绿光(G)，所生成的红光和绿光及部分蓝光能够透过第二透反膜304混合生成白光，用以提供背光；所生成的部分红光和绿光不能透过第一透反膜303而被反射回来，重新出射，提高光利用率；同时，部分蓝光被反射回来后重新被光转换材料吸收再次激发，增加激发次数，提高光利用率。
可选地，在另一实施方式中，背光模组也可以作为直下式光源为显示设备提供背光光源。
请参阅图6，图6是本发明显示设备一实施方式的结构示意图。本发明提供一种显示设备，该显示设备包括背光模组501和液晶显示面板502，背光模组501的结构与上述实施例中相同，在此不再赘述；液晶显示面板502的结构选用常规结构。该显示设备的背光模组具有较大的出光角度，进而使该显示设备具有较大的视角，显示效果较好。
综上，本发明提供一种背光模组，该背光模组包括至少两片光转换膜，通过至少两片光转换膜能够增强光的散射，增大背光模组的出光角度，进而达到广视角效果；同时具有至少两片光转换膜，在散射出光的同时还能反射一部分光回来，再次进行激发出光，提高光利用率，增强光亮度，拥有更好的显示效 果。
以上所述仅为本发明的实施方式，并非因此限制本发明的专利范围，凡是利用本发明说明书及附图内容所作的等效结构或等效流程变换，或直接或间接运用在其他相关的技术领域，均同理包括在本发明的专利保护范围内。

Claims (20)

  1. 一种背光模组，其中，包括：
    光源，发出至少第一种光线；
    至少两片光转换膜，其中至少一片所述光转换膜接收所述第一种光线并将其转换为至少第二种光线出射，使得所述背光模组的出光角度大于120度；色温小于16000，对比度大于1500∶1；所述光转换膜包括光转换材料，所述光转换材料在所述光转换膜中的浓度为0.2％～25％；所述光转换材料层的膜厚度为70～135微米。
  2. 根据权利要求1所述的背光模组，其中，所述至少两片光转换膜分别将所述第一种光线转换为相同或不同波长的第二种光线出射；或一片所述光转换膜将所述第一种光线转换为第二种光线出射，另一片所述光转换膜将所述第二种光线转换为第三种光线出射。
  3. 根据权利要求2所述的背光模组，其中，部分所述第一种光线通过一片所述光转换膜并出射至另一片所述光转换膜上，并且部分被反射回以继续将所述第一种光线转换为第二种光线。
  4. 根据权利要求1所述的背光模组，其中，所述光转换膜包含量子点材料和/或荧光材料；所述量子点材料的粒径为1～20纳米；所述量子点材料与所述荧光材料的浓度比为1∶100～1∶5。
  5. 根据权利要求1所述的背光模组，其中，包括：
    第一透反膜，设置于所述至少两片光转换膜在光路上邻近所述光源的一侧，透过所述第一种光线并反射除所述第一种光线外的光线；
    第二透反膜，设置于所述至少两片光转换膜在光路上远离所述光源的一侧，至少部分反射所述第一种光线并透过除所述第一种光线外的光线。
  6. 根据权利要求1所述的背光模组，其中，包括：
    棱镜片，设置于所述至少两片光转换膜的在光路上远离所述光源的一侧，用于仅在垂直视角对光线进行汇聚；和/或
    增亮片，设置于所述至少两片光转换膜的在光路上远离所述光源的一侧，用于透过一偏振光而反射另一偏振光。
  7. 一种背光模组，其中，包括：
    光源，发出至少第一种光线；
    至少两片光转换膜，其中至少一片所述光转换膜接收所述第一种光线并将其转换为至少第二种光线出射，使得所述背光模组的出光角度匹配广视角显示要求。
  8. 根据权利要求7所述的背光模组，其中，所述背光模组的出光角度所匹配的广视角大于120度；色温小于16000，对比度大于1500∶1。
  9. 根据权利要求7所述的背光模组，其中，所述至少两片光转换膜分别将所述第一种光线转换为相同或不同波长的第二种光线出射；或一片所述光转换膜将所述第一种光线转换为第二种光线出射，另一片所述光转换膜将所述第二种光线转换为第三种光线出射。
  10. 根据权利要求9所述的背光模组，其中，部分所述第一种光线通过一片所述光转换膜并出射至另一片所述光转换膜上，并且部分被反射回以继续将所述第一种光线转换为第二种光线。
  11. 根据权利要求7所述的背光模组，其中，所述光转换膜包括光转换材料，所述光转换材料在所述光转换膜中的浓度为0.2％～25％；
  12. 根据权利要求11所述的背光模组，其中，所述光转换膜包含量子点材料和/或荧光材料；所述量子点材料的粒径为1～20纳米；所述量子点材料与所述荧光材料的浓度比为1∶100～1∶5。
  13. 根据权利要求12所述的背光模组，其中，所述量子点材料包括蓝光量子点材料、绿光量子点材料、红光量子点材料，所述蓝光量子点材料在所述量子点材料中的浓度为40％～65％；所述绿光量子点材料在所述量子点材料中的浓度为15％～45％、所述红光量子点材料在所述量子点材料中的浓度为5％～30％；所述绿光量子点材料与所述红光量子点材料的浓度比为3∶1～1.5∶1。
  14. 根据权利要求7所述的背光模组，其中，所述光转换材料层的膜厚度为70～135微米。
  15. 根据权利要求7所述的背光模组，其中，包括：
    第一透反膜，设置于所述至少两片光转换膜在光路上邻近所述光源的一侧，透过所述第一种光线并反射除所述第一种光线外的光线；
    第二透反膜，设置于所述至少两片光转换膜在光路上远离所述光源的一侧，至少部分反射所述第一种光线并透过除所述第一种光线外的光线。
  16. 根据权利要求7所述的背光模组，其中，包括：
    棱镜片，设置于所述至少两片光转换膜的在光路上远离所述光源的一侧，用于仅在垂直视角对光线进行汇聚；和/或
    增亮片，设置于所述至少两片光转换膜的在光路上远离所述光源的一侧，用于透过一偏振光而反射另一偏振光。
  17. 一种显示设备，包括背光模组，其中，所述背光模组包括：光源，发出至少第一种光线；至少两片光转换膜，其中至少一片所述光转换膜接收所述第一种光线并将其转换为至少第二种光线出射，使得所述背光模组的出光角度匹配广视角显示要求。
  18. 根据权利要求17所述的显示设备，其中，所述背光模组的出光角度所匹配的广视角大于120度；色温小于16000，对比度大于1500∶1。
  19. 根据权利要求17所述的显示设备，其中，所述背光模组还包括：
    第一透反膜，设置于所述至少两片光转换膜在光路上邻近所述光源的一侧，透过所述第一种光线并反射除所述第一种光线外的光线；
    第二透反膜，设置于所述至少两片光转换膜在光路上远离所述光源的一侧，至少部分反射所述第一种光线并透过除所述第一种光线外的光线。
  20. 根据权利要求7所述的显示设备，其中，所述背光模组还包括：
    棱镜片，设置于所述至少两片光转换膜的在光路上远离所述光源的一侧，用于仅在垂直视角对光线进行汇聚；和/或
    增亮片，设置于所述至少两片光转换膜的在光路上远离所述光源的一侧，用于透过一偏振光而反射另一偏振光。
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