WO2019201172A1 - 背光源、背光模组和显示装置 - Google Patents

背光源、背光模组和显示装置 Download PDF

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Publication number
WO2019201172A1
WO2019201172A1 PCT/CN2019/082467 CN2019082467W WO2019201172A1 WO 2019201172 A1 WO2019201172 A1 WO 2019201172A1 CN 2019082467 W CN2019082467 W CN 2019082467W WO 2019201172 A1 WO2019201172 A1 WO 2019201172A1
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Prior art keywords
light
region
backlight
disposed
modifying
Prior art date
Application number
PCT/CN2019/082467
Other languages
English (en)
French (fr)
Inventor
徐健
先建波
Original Assignee
京东方科技集团股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 京东方科技集团股份有限公司 filed Critical 京东方科技集团股份有限公司
Priority to JP2019556856A priority Critical patent/JP7303114B2/ja
Priority to US16/609,613 priority patent/US10976600B2/en
Priority to EP19788370.5A priority patent/EP3783255B1/en
Publication of WO2019201172A1 publication Critical patent/WO2019201172A1/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
    • G02F1/133602—Direct backlight
    • G02F1/133605—Direct backlight including specially adapted reflectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21S—NON-PORTABLE LIGHTING DEVICES; SYSTEMS THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLE EXTERIORS
    • F21S2/00—Systems of lighting devices, not provided for in main groups F21S4/00 - F21S10/00 or F21S19/00, e.g. of modular construction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F21—LIGHTING
    • F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
    • F21V7/00—Reflectors for light sources
    • 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
    • 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
    • G02F1/133609—Direct backlight including means for improving the color mixing, e.g. white
    • 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
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—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
    • G02F2202/00—Materials and properties
    • G02F2202/36—Micro- or nanomaterials

Definitions

  • the present disclosure relates to the field of display devices, and in particular, to a backlight, a backlight module including the same, and a display device including the same.
  • a backlight for providing a light source is generally included.
  • quantum dot backlights have been used more and more widely.
  • a backlight including a back sheet, a reflective sheet, and a plurality of light emitting elements, an inner surface side of the back sheet defines an accommodation space, and the reflection sheet is disposed at the On the inner surface of the back sheet, wherein the backlight further comprises at least one light modification area, the light modification area is disposed on the reflection sheet, and the light modification area includes at least one light conversion device, the light The conversion device is capable of optically processing light emitted by the light emitting element.
  • the light emitted by the light emitting element is monochromatic light
  • the optical processing is to convert the monochromatic light into mixed light
  • the mixed light is white light.
  • the light modification zone comprises a plurality of light conversion devices arranged in an array.
  • the backing plate includes a bottom plate and side walls disposed around an edge of the bottom plate, the side walls including longitudinal side walls and lateral side walls, the light modifying area being disposed at the side walls and a reflective sheet on at least one of the bottom plates.
  • the plurality of light emitting elements are arranged in a plurality of rows and columns on a bottom plate of the receiving space, the light modifying region comprising a plurality of first light modifying regions, the plurality of first light modifying regions Provided on at least one of the lateral side wall and the longitudinal side wall, wherein the first light-modifying region disposed on the lateral sidewall along the row direction of the light-emitting element corresponds to the column of the light-emitting elements, along the column of the light-emitting element a first light-modifying region disposed on the longitudinal side wall corresponding to the row of light-emitting elements, wherein a row direction of the light-emitting element is parallel to the lateral sidewall, and a column direction of the light-emitting element is parallel to the longitudinal sidewall .
  • the plurality of light conversion devices in the first light modification region are arranged in a plurality of rows and columns, and in the same first light modification region, the size of the light conversion device and the first The distance between the light-emitting elements corresponding to a light-modifying region is inversely related.
  • the light emitting element includes a package region, and a width of the first light modification region disposed on the lateral sidewall in the row direction is less than or equal to a width of a package region of the light emitting element, and is disposed at The width of the first light-modifying region on the longitudinal side wall in the column direction is less than or equal to the width of the package region of the light-emitting element.
  • the light modification zone further includes at least one second light modification zone disposed on at least one of the lateral sidewall and the longitudinal sidewall, The second light modification zone is disposed adjacent to the first light modification zone.
  • a second light-modifying region on the lateral sidewall is disposed between adjacent two columns of light-emitting elements; a second light-modifying region on the longitudinal sidewall is disposed adjacent to two Between the light-emitting elements.
  • the plurality of light conversion devices in the second light modification region are arranged in a plurality of rows and columns, and the size of the light conversion device in the same second light modification region is different from the second light.
  • the distance between the light-emitting elements corresponding to the modified regions is inversely related.
  • the light modifying region further includes at least one third light modifying region disposed on the reflective sheet of the bottom plate near an edge of the sidewall and with the first The light modification areas are adjacent.
  • the plurality of light conversion devices in the third light modification region are arranged in a plurality of rows and columns, and the size of the light conversion device in the same third light modification region is different from the third light.
  • the distance between the light-emitting elements corresponding to the modified regions is positively correlated.
  • the light modification region further includes at least one fourth light modification region, and the plurality of the light conversion devices in the fourth light modification region are arranged to surround respective light emitting elements.
  • the size of the light converting device in the fourth light modifying region is inversely related to the distance between the light emitting elements corresponding to the fourth light modifying region.
  • the light emitting element includes a lens device and a light emitting diode, the light emitting diode is disposed on the bottom plate, the lens device is disposed on a top of the light emitting diode, and the lens device and the bottom plate There is a gap between the reflection sheets on the top,
  • An orthographic projection of the fourth light-modifying region on the reflective sheet falls within an orthographic projection of the lens device on the reflective sheet.
  • the light conversion device is in the same first light modification region, the second light modification region, the third light modification region, and the fourth light modification region Staggered.
  • the light conversion device has a circular shape, the first light modification region, the second light modification region, the third light modification region, and the fourth light modification
  • the size of the light conversion device in the region is the diameter of the light conversion device.
  • the light conversion device comprises a quantum dot material.
  • the light emitting element is capable of emitting blue light.
  • a backlight module includes a backlight and a quantum dot layer, wherein the backlight is the backlight described above, and the quantum dot layer is disposed at On the light exit side of the backlight, the quantum dot layer is capable of converting light emitted by the light emitting element into white light.
  • a display device includes a display panel and a backlight module disposed on a light incident side of the display panel, wherein the backlight module includes the backlight described above a module, the quantum dot layer being located between the backlight and the display panel.
  • FIG. 1 is a schematic diagram of a provided backlight in accordance with an embodiment of the present disclosure
  • FIG. 2 is a cross-sectional schematic view of a provided backlight in accordance with an embodiment of the present disclosure
  • FIG. 3 is a schematic illustration of a first light modification zone provided in accordance with an embodiment of the present disclosure
  • FIG. 4 is a schematic illustration of a second light modification zone provided in accordance with an embodiment of the present disclosure.
  • FIG. 5 is a schematic illustration of a provided backlight in accordance with an embodiment of the present disclosure.
  • FIG. 6 is a schematic illustration of a third light modification zone provided in accordance with an embodiment of the present disclosure.
  • FIG. 7 is a schematic diagram of a backlight in accordance with an embodiment of the present disclosure.
  • FIG. 8 is a schematic illustration of a fourth light modification zone provided in accordance with an embodiment of the present disclosure.
  • FIG. 9 is a schematic diagram of a light conversion device within a fourth light modification region provided in accordance with an embodiment of the present disclosure.
  • FIG. 10 is a schematic illustration of a provided backlight in accordance with an embodiment of the present disclosure.
  • a quantum dot backlight includes a plurality of light emitting elements, an optical component that converts a point light source into a surface light source, and a quantum dot layer that converts light emitted from the light emitting element into white light.
  • display devices including quantum dot backlights exhibit color shifting during display, which reduces the customer experience. For example, when the light emitted by the light-emitting element is blue light, the display device including the quantum dot backlight may be bluish when the display is displayed.
  • the reason why the color shift occurs when the display device including the quantum dot backlight is displayed is as follows.
  • the light conversion efficiency is fixed.
  • the intensity of light emitted by the light-emitting element exceeds the conversion efficiency of the quantum dot layer, a phenomenon in which part of the colored light is converted into white light and part of the colored light is not converted into white light occurs.
  • color shift occurs when the display device is displayed.
  • the backlight includes a backing plate 200, a reflective sheet 300 (see FIG. 2), and a plurality of light emitting elements 110.
  • the reflection sheet 300 is disposed on the inner surface of the back plate, and the light-emitting element 110 may be disposed in the accommodation space (see FIGS. 1 and 2). It may be disposed on one side of the backboard 200.
  • the backlight further includes at least one light modification area disposed on the reflective sheet 300.
  • the light modification region includes at least one light conversion device (such as the dot structure in FIGS. 1 and 2), and the light conversion device is capable of optically processing light emitted from the light emitting element 110.
  • the light emitted by the illuminating element 110 is monochromatic light and the optical processing is the conversion of monochromatic light into mixed light.
  • the light emitted by the light-emitting element 110 is colored light (for example, blue light, green light, or the like).
  • the light emitting element is capable of emitting blue light, but the disclosure is not limited thereto.
  • the light-converting device converts at least a portion of the color light into the mixed light.
  • Mixed light is light that is formed by mixing a plurality of colored lights together. In some specific examples, the mixed light is white light.
  • White light is a mixed light which can be obtained by mixing a plurality of spectral primary colors (blue light, red light, and green light) in a certain ratio, but the present disclosure is not limited thereto. For convenience of explanation, the following description will be made by using mixed light as white light.
  • the backlight provided by the present disclosure is used in combination with a quantum dot layer to form a backlight module, and the quantum dot layer can convert light emitted by the light emitting element into white light.
  • the light irradiated on the light-modifying region includes colored light directly irradiated on the light-modifying region by the light-emitting element, and also includes colored light reflected on the light-modifying region by the reflecting sheet 300 or other film layer structure. Accordingly, after the colored light is irradiated on the light conversion device in the light modification region, the light conversion device can convert at least part of the color light into white light, and then emit the converted white light toward the quantum dot layer.
  • the light-modifying region can complement the light-switching ability of the quantum dot layer, so that the light emitted from the portion corresponding to the light-modifying region on the quantum dot layer is white light with higher purity, thereby being at least reduced to some extent.
  • a color shift phenomenon when a display device including the backlight is displayed on a screen.
  • the light modification zone comprises a plurality of light conversion devices arranged in an array. That is, in one light modification region, a plurality of light conversion devices may be included, and the plurality of light conversion devices may be arranged in an array as shown in FIG.
  • the plurality of light conversion devices may be arranged in other manners as needed, and the present disclosure is not limited thereto.
  • the light conversion device comprises a quantum dot material and the quantum dot material is capable of converting light emitted by the light emitting element into white light.
  • the quantum dot material can be made into an optical coating, and then the light conversion device can be formed by printing or spraying.
  • the backing plate 200 includes a bottom plate 220 and a side wall 210 disposed around an edge of the bottom plate 220.
  • the side wall 210 includes a longitudinal side wall 211 and a lateral side wall 212, and the light modifying area is disposed at the side wall 210 and the bottom plate 220.
  • a light modifying zone is disposed on the longitudinal side wall 211 and/or the lateral side wall 212 of the side wall 210, and/or the bottom plate 220.
  • a light-modifying region is disposed on the reflective sheet on the side wall 210 and/or the bottom plate 220 to convert some or all of the colored light that is irradiated/reflected to the corresponding position into white light.
  • the plurality of light emitting elements 110 are arranged in a plurality of rows and columns on the bottom plate 220 of the accommodation space
  • the light modification region includes a plurality of first light modification regions
  • the plurality of first light modification regions are disposed on the lateral sidewalls and At least one of the longitudinal side walls, wherein the first light-modifying region disposed on the lateral sidewall 212 in the row direction of the light-emitting element 110 corresponds to the light-emitting element row, and is disposed on the longitudinal sidewall 211 along the column direction of the light-emitting element
  • the first light-modifying region corresponds to the light-emitting element row, wherein the row direction of the light-emitting element 110 is parallel to the lateral sidewall 212, and the column direction of the light-emitting element is parallel to the longitudinal sidewall 211.
  • the first light-modifying region disposed on the lateral sidewall 212 along the row direction of the light-emitting element 110 corresponds to the light-emitting element column, and refers to a central position of the first light-modifying region disposed on the lateral sidewall 212 and a column of light.
  • the centers of the elements are on the same line and the line is parallel to the longitudinal side walls.
  • the first first light-modifying region (in the left-to-right direction) on the lateral side wall 212 of the upper side of the backing plate 200 and the first column of light-emitting elements on the bottom plate 220 are shown.
  • the centers (in the left-to-right direction) are on the same line.
  • the first light-modifying region disposed on the longitudinal sidewall 211 along the row direction of the light-emitting element corresponds to the row of light-emitting elements, and refers to the center position of the first light-modifying region disposed on the longitudinal sidewall 211 and a row of light-emitting elements.
  • the centers are on the same line and the line is parallel to the lateral side walls 212.
  • the present disclosure is not limited thereto.
  • the backlight serves as a direct type backlight.
  • the side wall 210 is bent upward to form a slope angle with the bottom plate 220.
  • the reflective sheet 300 on the bottom plate 220 extends along the folded sidewall 210 to the sidewall edge.
  • the bottom end of the side wall 210 is connected to the bottom plate 220, and the top end of the side wall 210 is adjacent to the optical film layer.
  • the optical film layer may include a prism sheet, a diffusion sheet, or the like.
  • the reflective sheet 300 is located on the lateral sidewall 212 and is disposed with the first light-modifying region 122 and the reflective sheet 300 on the longitudinal sidewall 211 at a position opposite to the column of the light-emitting elements 110. And a first light-modifying region 121 is disposed at a position opposite to the row of the light-emitting elements 110, as shown in FIG.
  • the light conversion device in the first light modification region 121 of the reflection sheet 300 on the portion on the longitudinal side wall 211 can convert at least a portion of the light irradiated in the first light modification region into white light, avoiding the backlight module including the backlight.
  • the light emitted from the area is white and impure and colored light occurs.
  • the light conversion device disposed in the first light modification region 122 on the portion of the reflective sheet 300 on the lateral sidewall 212 can convert at least a portion of the light irradiated in the first light modification region 122 into white light, avoiding including In the backlight module of the backlight, light emitted from the region is caused by white impure and partial color light.
  • the backlight may not be limited.
  • the backlight may also be a side-in type backlight, that is, the light-emitting element 110 is disposed on one side of the bottom plate 220 instead of being disposed on the bottom plate 220.
  • the plurality of light conversion devices in the first light modification region are arranged in a plurality of rows and columns, and in the same first light modification region, the size of the light conversion device corresponds to the first light modification region.
  • the distance between the illuminating elements is inversely related. Specifically, as shown in FIGS. 1 and 2, the first light-modifying region 122 on the reflective sheet 300 of the lateral sidewall 212 and the plurality of light in the first light-modifying region 121 on the reflective sheet 300 of the longitudinal sidewall 211
  • the conversion devices are arranged in multiple rows and columns.
  • the light modification region may be In the area where the brightness of the backlight is large, the light modification area is used to convert the light of the area with a large brightness, so that the color unevenness of the display device during display can be avoided.
  • the reflection sheet is located on a portion of the side wall, and the closer to the position of the light-emitting element, the greater the brightness. Accordingly, the brightness of the area facing the light-emitting element is also the area where the brightness of the entire backlight is large.
  • the light-converting in the first light-modified region on the reflective sheet of the sidewall is inversely related to the distance between the light conversion device and the light-emitting element, that is, the larger the size of the light-converting device closer to the light-emitting element, so that the color of the light emitted from the first light-modifying region can be ensured to be uniform. This is because the larger the size of the light conversion device, the more the quantum dot material, and the higher the conversion efficiency.
  • the specific structure of the light-emitting element is not particularly limited.
  • the light emitting element may include a light emitting diode. It is easily understood that the light-emitting element has a package area.
  • a width of a first light-modifying region disposed on the lateral sidewall 212 in the row direction is less than or equal to a width of a package region of the light-emitting element 110, and is disposed on a longitudinal side.
  • the width of one of the first light-modifying regions on the wall 211 in the column direction is less than or equal to the width of the package region of the light-emitting element 110.
  • a first light-modifying region may be disposed on a reflective sheet of the sidewall 210 opposite to the light-emitting element 110 and located within a width range of the package region of the light-emitting element 110, for example, three may be disposed in the first light-modifying region.
  • Row or three-column light conversion device, and the total width of the three-row or three-column light conversion device is less than or equal to the width of the package region of the light-emitting element, thereby avoiding excessive color light being injected before entering the quantum dot layer Convert to white light.
  • the diameter of the light conversion device is less than one-half the width of the package region of the light-emitting element, so that at least two or two columns of light conversion devices can be disposed in the first light modification region.
  • the above-mentioned light conversion device corresponding to the package area of the light-emitting diode can ensure the optimal reflection effect of the optical modification point and weaken the strong color light area.
  • the interference region is located between two adjacent rows or columns of light-emitting elements, and it is easy to understand the brightness of the interference region. Greater than the brightness of the area adjacent to the interference zone.
  • a second light modifying zone can also be provided in the interference zone.
  • the light modification region further includes at least one second light modification region disposed on at least one of the lateral sidewall and the longitudinal sidewall, the second light modification region and the first light modification The area is adjacent to the setting.
  • a second light modifying zone on the lateral sidewalls is disposed between adjacent two columns of light emitting elements; a second light modifying zone on the longitudinal sidewalls is disposed between adjacent two rows of light emitting elements.
  • the second light-modifying region may be disposed between two adjacent first light-modifying regions 122 on the lateral sidewall 212 and/or two adjacent to the longitudinal sidewall 211.
  • a light modification zone 121 is between.
  • the reflective sheet is located on the longitudinal side wall 211 and is provided with a second light-modifying region 121' at a position opposite to a portion between any two adjacent rows of light-emitting elements 110, and/or the reflective sheet 300 is located on the lateral side wall 212.
  • a second light-modifying region 122' is disposed at a position opposite to a portion between any two adjacent columns of light-emitting elements.
  • the center position of the second light-modifying region 121' is on the same line as the center position between any two adjacent rows of light-emitting elements 110, and the straight line is parallel to the longitudinal side walls.
  • the central position of the second light-modifying region 122' is on the same line as the center position between any two adjacent columns of light-emitting elements 110, and the straight line is parallel to the lateral side walls.
  • the second light-modifying region 121' on the portion of the reflective sheet 300 on the longitudinal side wall 211 can convert at least a portion of the colored light of the region into white light, the second light on the portion of the reflective sheet 300 on the lateral sidewall 212
  • the modification region 122' can convert at least a portion of the colored light of the region into white light, so that the color shift phenomenon caused by the interference of light can be alleviated or even avoided.
  • the plurality of light conversion devices in the second light modification region are arranged in a plurality of rows and columns, and the size of the light conversion device in the same second light modification region corresponds to the second light modification region.
  • the distance between the illuminating elements is inversely related.
  • the second light-modifying region 121' on the portion of the longitudinal side wall 211 and the second light-modifying region 122' on the portion of the lateral sidewall 212 may be arranged in a plurality of rows and columns, and The size of the light converting device in the same second light modifying region is inversely related to the distance between the light emitting elements corresponding to the second light modifying region.
  • first light-modifying region and the second light-modifying region may be simultaneously disposed on the same backing plate 200, as shown in FIG. 5.
  • the width of the second light-modifying region 122' on the lateral side wall may be set to be equal to the width of the first light-modifying region on the lateral side wall, and the width of the second light-modifying region 121' on the longitudinal side wall may also be set to The width of the first light-modifying region on the longitudinal side wall is equal, and of course, the width of each of the second light-modifying regions may be set as needed.
  • the bottom plate 220 and the side wall 210 of the back plate 200 are provided with a reflection sheet 300, and a part of the light reflected by the reflection sheet 300 on the side wall is reflected to the bottom plate 220.
  • the reflective sheet 300 On the reflective sheet 300.
  • the light modifying region further includes a third light modifying region disposed on the reflective sheet at the edge of the bottom plate near the sidewall and associated with The first light modification zone is adjacent.
  • the third light-modifying region 131 is disposed, and/or the reflection sheet 300 is located at the edge of the bottom plate 220.
  • a third light-modifying region 132 is disposed at a position opposite to the column of the light-emitting elements 110.
  • the plurality of light conversion devices in the third light modification region are arranged in a plurality of rows and columns, in the same third light modification region.
  • the size of the light conversion device in the medium is positively correlated with the distance between the light-emitting elements corresponding to the third light-modifying region. That is, the smaller the size of the light conversion device closer to the light emitting element.
  • the first light-modifying region, the second light-modifying region, and the third light-modifying region may be simultaneously disposed on the same backing plate 200, as shown in FIG.
  • the width of the third modification region 132 parallel to the lateral sidewalls may be set to be equal to the width of the first light modification region on the lateral sidewalls, and the center position of the third light modification region 132 is the same as the center positions of the columns of light-emitting elements On the straight line;
  • the width of the third light-modifying region 131 parallel to the longitudinal side wall may also be set to be equal to the width of the first light-modifying region on the longitudinal side wall, and the center position of the third light-modifying region 131 and one row of light-emitting elements The center positions are on the same line.
  • the width of each of the third light-modifying regions can also be set as needed.
  • the light modification zone further includes at least one fourth light modification zone 140, and the plurality of light conversion devices in the fourth light modification zone 140 are arranged to surround the respective light emitting elements 110.
  • a respective fourth light-modifying region 140 may be disposed around each of the light-emitting elements 110, respectively.
  • the fourth light-modifying region 140 is disposed around the light-emitting element, and at least a portion of the colored light irradiated onto the fourth light-modified region 140 can be converted into white light, thereby preventing the backlight from being
  • the mated quantum dot layer cannot completely convert the light emitted from the region into white light, and improves the white light purity of the backlight module including the backlight.
  • the size of the light-converting device in the fourth light-modifying region and the light-emitting element corresponding to the fourth light-modifying region is inversely related.
  • a plurality of light conversion devices in the fourth light modification region 140 are arranged to surround the corresponding light emitting elements 110.
  • the size of the light conversion device and the first is inversely related. That is, the size of the light conversion device closer to the light emitting element 110 is larger.
  • the light emitting element 110 includes a lens device 111 and a light emitting diode 112, the light emitting diode 112 is disposed on the bottom plate 220, the lens device 111 is disposed on the top of the light emitting diode 112, and the lens device 111 and the reflective sheet on the bottom plate 220 are There is a gap therebetween, and the orthographic projection of the fourth light-modifying region 140 on the reflective sheet falls within the orthographic projection of the lens device 111 on the reflective sheet.
  • the light converting device is located between the orthographic projection 111' of the lens device 111 on the bottom plate 220 and the orthographic projection 112' of the light emitting diode on the bottom plate 220. This converts the light emitted by the light emitting diode 112 and the portion of the colored light refracted/reflected/projected by the lens device 111 into white light.
  • first light-modifying region, the second light-modifying region, the third light-modifying region, and the fourth light-modifying region may be simultaneously disposed on the same backing plate 200, as shown in FIG.
  • the light converting devices are staggered in the same first light modifying region, in the second light modifying region, in the third light modifying region, and in the fourth light modifying region. Specifically, in the same first light modification region, the second light modification region, and the third light modification region, two adjacent rows of light conversion devices are staggered; or two adjacent columns of light conversion devices are staggered, as shown in FIG. 1-FIG. 7; in the same fourth light-modifying region, a plurality of ring-shaped light-converting devices are staggered as shown in FIGS. 8 and 9.
  • the (original) staggered arrangement of two adjacent (ring) row light conversion devices or the (original) staggered arrangement of adjacent (ring) two-column light conversion devices can set as many optical conversion devices as possible in the light modification region, Improve the light conversion efficiency of the light modification zone.
  • the origins of two adjacent rows of optical conversion devices may be staggered; or the origins of adjacent two columns of optical conversion devices may be staggered.
  • the origin of a column of optical conversion devices refers to the end of one end of the column of light conversion devices.
  • the origin of a row of optical conversion devices refers to the end of one end of the row of optical conversion devices.
  • the arrangement result of the light conversion device based on the origin is the same as that of the light conversion device shown in FIGS. 1 to 7.
  • the shape of the light conversion device is circular, and the size of the light conversion device in the first light modification region, the second light modification region, the third light modification region, and the fourth light modification region is light.
  • the diameter of the conversion device is shown in FIGS. 1 to 7, each of the light modification regions includes a plurality of light conversion devices each having a circular shape, and the plurality of light conversion devices may be arranged in a plurality of rows or columns.
  • each of the light conversion devices may also be other shapes such as a rectangle, a diamond, or the like, and the present disclosure is not limited thereto.
  • the size of the light conversion device is related to its diameter, and therefore, the size of the light conversion device can be defined by defining the diameter of the light conversion device.
  • the color of the light emitted from the light-emitting element is not particularly limited, and as an embodiment, the light-emitting element may emit blue light. Accordingly, quantum dots in the light conversion device can convert blue light into white light. Wherein, the quantum dots can be excited by blue light into a plurality of other colors, such as red and green, and are combined with blue light and converted into white light.
  • the position of the light conversion device can be set according to specific needs.
  • the arrangement of the optical conversion device will be further described below with reference to the drawings.
  • the reflective sheet is located on the longitudinal side wall 211 and is provided with a first light-modifying region 121 at a position opposite to the row of the light-emitting elements 110.
  • the reflective sheet is located on the lateral side wall 212 and is provided with a first light-modifying region 122 at a position opposite to the column of the light-emitting elements.
  • a second light-modifying region 121' is disposed between adjacent two first light-modifying regions 121 without the first light-modifying region 121 in Fig. 1.
  • a second light-modifying region 122' is disposed between the adjacent two first light-modifying regions 122 without the first light-modifying region 122 in FIG.
  • the backing plate includes both the light modifying regions of FIGS. 1 and 4.
  • the reflective sheet is located at the edge of the bottom plate 220 and is provided with a third light-modifying region 131 at a position corresponding to the row of the light-emitting elements 110.
  • the reflective sheet is located at the edge of the bottom plate 220 and is provided with a third light-modifying region 132 at a position corresponding to the column of the light-emitting elements 110.
  • the back sheet includes both the first light modification area of FIG. 1, the second light modification area of FIG. 4, and the third light modification area of FIG. That is, in the back sheet shown in FIG. 7, the reflection sheet is located on the longitudinal side wall 211 and is provided with the first light-modifying region 121 at a position opposite to the row of the light-emitting elements 110. A second light-modifying region 121' is disposed between the adjacent two first light-modifying regions 121. The reflective sheet is located on the lateral side wall 212 and is provided with a first light-modifying region 122 at a position opposite to the column of the light-emitting elements. A second light-modifying region 122' is disposed between the adjacent two first light-modifying regions 122.
  • the reflective sheet is located at the edge of the bottom plate 220 and is provided with a third light-modifying region 131 at a position corresponding to the row of the light-emitting elements 110.
  • the reflective sheet is located at the edge of the bottom plate 220 and is provided with a third light-modifying region 132 at a position corresponding to the column of the light-emitting elements 110.
  • the reflective sheet is located at a respective light-emitting element of the bottom plate 220 to provide a fourth light-modifying region 140.
  • the back sheet includes both the first light modification area of FIG. 1, the second light modification area of FIG. 4, the third light modification area of FIG. 6, and the Four modified areas. That is, in the back sheet shown in FIG. 10, the reflection sheet is located on the longitudinal side wall 211 and is provided with the first light-modifying region 121 at a position opposite to the row of the light-emitting elements 110. A second light-modifying region 121' is disposed between the adjacent two first light-modifying regions 121.
  • the reflective sheet is located on the lateral side wall 212 and is provided with a first light-modifying region 122 at a position opposite to the column of the light-emitting elements. A second light-modifying region 122' is disposed between the adjacent two first light-modifying regions 122.
  • the reflective sheet is located at the edge of the bottom plate 220 and is provided with a third light-modifying region 131 at a position corresponding to the row of the light-emitting elements 110.
  • the reflective sheet is located at the edge of the bottom plate 220 and is provided with a third light-modifying region 132 at a position corresponding to the column of the light-emitting elements 110.
  • a fourth light-modifying region 140 is disposed on a portion of the bottom plate 220 of the reflective sheet.
  • the direct type backlight is described in detail in the present disclosure, the present disclosure is also applicable to a side-in type backlight, that is, the light emitting element is disposed on the sidewall of the backlight, and the light conversion device is disposed at Adjacent to the reflective sheet on the side of the light-emitting element.
  • a backlight module including a backlight and a quantum dot layer.
  • the backlight is the above backlight provided by the disclosure.
  • the quantum dot layer is disposed on a light exiting side of the backlight.
  • the quantum dot layer is capable of converting light emitted from the light emitting element into white light.
  • the light-modifying region disposed in the backlight can convert part of the light irradiated on the light-modifying region into white light, and the remaining color light that is not converted into white light is within the conversion efficiency range of the quantum dot layer.
  • the quantum dot layer is converted into white light.
  • the light conversion device is not disposed in the non-light-affected zone, and the emitted light is a relatively low-brightness colored light, which can be converted from a quantum dot layer to white light.
  • the backlight module provided by the present disclosure can emit white light with high purity, so that the display device including the backlight module can avoid color shift during display and improve display effect.
  • a display device includes a display panel and a backlight module disposed on a light incident side of the display panel, wherein the backlight module is provided by the present disclosure
  • the quantum dot layer is located between the backlight and the display panel.
  • the display device can prevent the color shift phenomenon during display and improve the display effect.
  • the specific structure of the display panel is not particularly limited.
  • the display panel may be a liquid crystal display panel, an electronic paper book, or an electrochromic display panel.

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Abstract

一种背光源，背光源包括背板（200）、反射片（300）和多个发光元件（110），反射片（300）设置在背板（200）的内表面上，背光源还包括至少一个光修饰区，光修饰区设置在反射片（300）上，光修饰区内包括至少一个光转换器件，光转换器件能够对发光元件（110）发出的光进行光学处理。

Description

背光源、背光模组和显示装置
相关申请的交叉引用
本申请要求于2018年4月16日在中国知识产权局提交的申请号为201820534670.5、名称为“背光源、背光模组和显示装置”的中国专利申请的优先权，该中国专利申请的全部公开内容通过引用合并于此。
技术领域
本公开涉及显示装置领域，具体地，涉及背光源、包括该背光源的背光模组和包括该背光模组的显示装置。
背景技术
在像素器件不能主动发光的例如液晶显示装置、电纸书、电致变色显示装置等显示装置中，通常包括用于提供光源的背光源。
作为一种可以提高显示色域的优选方案，量子点背光源已经得到了越来越广发的应用。
发明内容
根据本公开的一个方面，提供一种背光源，所述背光源包括背板、反射片和多个发光元件，所述背板的内表面一侧限定有容纳空间，所述反射片设置在所述背板的内表面上，其中，所述背光源还包括至少一个光修饰区，所述光修饰区设置在所述反射片上，所述光修饰区内包括至少一个光转换器件，所述光转换器件能够对所述发光元件发出的光进行光学处理。
在一些实施例中，所述发光元件所发出的光为单色光，所述光学处理是将所述单色光转化为混合光。
在一些实施例中，所述混合光为白光。
在一些实施例中，所述光修饰区包含阵列排布的多个光转换器件。
在一些实施例中，所述背板包括底板和环绕所述底板的边缘设置 的侧壁，所述侧壁包括纵向侧壁和横向侧壁，所述光修饰区设置在位于所述侧壁和所述底板中至少一者上的反射片上。
在一些实施例中，所述多个发光元件在所述容纳空间的底板上布置成多行多列，所述光修饰区包括多个第一光修饰区，所述多个第一光修饰区设置在所述横向侧壁和纵向侧壁中的至少一者上，其中，沿发光元件的行方向设置在所述横向侧壁上的第一光修饰区对应发光元件列，沿发光元件的列方向设置在所述纵向侧壁上的第一光修饰区对应发光元件行，其中所述发光元件的行方向与所述横向侧壁平行，所述发光元件的列方向与所述纵向侧壁平行。
在一些实施例中，所述第一光修饰区中的多个光转换器件排布成多行多列，在同一个所述第一光修饰区中，所述光转换器件的尺寸与该第一光修饰区所对应的发光元件之间的距离反相关。
在一些实施例中，所述发光元件包括封装区，设置在所述横向侧壁上的第一光修饰区沿所述行方向的宽度小于或等于所述发光元件的封装区的宽度，设置在所述纵向侧壁上的第一光修饰区沿所述列方向的宽度小于或等于所述发光元件的封装区的宽度。
在一些实施例中，所述光修饰区还包括至少一个第二光修饰区，所述第二光修饰区设置在所述横向侧壁和所述纵向侧壁中的至少一者上，所述第二光修饰区与所述第一光修饰区相邻设置。
在一些实施例中，在所述横向侧壁上的第二光修饰区设置在相邻的两列发光元件之间；在所述纵向侧壁上的第二光修饰区设置在相邻的两行发光元件之间。
在一些实施例中，所述第二光修饰区内的多个光转换器件排布成多行多列，在同一个所述第二光修饰区中的光转换器件的尺寸与该第二光修饰区所对应的发光元件之间的距离反相关。
在一些实施例中，所述光修饰区还包括至少一个第三光修饰区，所述第三光修饰区设置在所述底板靠近所述侧壁的边缘处的反射片上并与所述第一光修饰区相邻。
在一些实施例中，所述第三光修饰区内的多个光转换器件排布成多行多列，在同一个所述第三光修饰区中的光转换器件的尺寸与该第三 光修饰区所对应的发光元件之间的距离正相关。
在一些实施例中，所述光修饰区还包括至少一个第四光修饰区，所述第四光修饰区中的多个所述光转换器件排布成环绕相应的发光元件。
在一些实施例中，所述第四光修饰区中的光转换器件的尺寸与该第四光修饰区所对应的发光元件之间的距离反相关。
在一些实施例中，所述发光元件包括透镜器件和发光二极管，所述发光二极管设置在所述底板上，所述透镜器件设置在所述发光二极管的顶部，且所述透镜器件与所述底板上的反射片之间存在间隔，
所述第四光修饰区在所述反射片上的正投影落入所述透镜器件在所述反射片上的正投影内。
在一些实施例中，在同一个所述第一光修饰区中、所述第二光修饰区中、所述第三光修饰区中以及所述第四光修饰区中，所述光转换器件交错排列。
在一些实施例中，所述光转换器件的形状为圆形，所述第一光修饰区中、所述第二光修饰区中、所述第三光修饰区中以及所述第四光修饰区中的光转换器件的尺寸为光转换器件的直径。
在一些实施例中，所述光转换器件包括量子点材料。
在一些实施例中，所述发光元件能够发出蓝光。
根据本公开的另一个方面，提供了一种背光模组，所述背光模组包括背光源和量子点层，其中，所述背光源为以上所述的背光源，所述量子点层设置在所述背光源的出光侧，所述量子点层能够将发光元件发出的光转换为白光。
根据本公开的再一个方面，提供了一种显示装置，所述显示装置包括显示面板和设置在所述显示面板入光侧的背光模组，其中，所述背光模组包括以上所述的背光模组，所述量子点层位于所述背光源和所述显示面板之间。
附图说明
附图是用来提供对本公开的进一步理解，并且构成说明书的一部 分，与下面的具体实施方式一起用于解释本公开，但并不构成对本公开的限制。在附图中：
图1是根据本公开的实施例的所提供的背光源的示意图；
图2是根据本公开的实施例的所提供的背光源的剖视示意图；
图3是根据本公开的实施例的所提供的第一光修饰区的示意图；
图4是根据本公开的实施例的所提供的第二光修饰区的示意图；
图5是根据本公开的实施例的所提供的背光源的示意图；
图6是根据本公开的实施例的所提供的第三光修饰区的示意图；
图7是根据本公开的实施例的背光源的示意图；
图8是根据本公开的实施例的所提供的第四光修饰区的示意图；
图9是根据本公开的实施例的所提供的第四光修饰区内的光转换器件的示意图；
图10是根据本公开的实施例的所提供的背光源的示意图。
具体实施方式
以下结合附图对本公开的具体实施方式进行详细说明。应当理解的是，此处所描述的具体实施方式仅用于说明和解释本公开，并不用于限制本公开。
在相关技术中，量子点背光源包括多个发光元件、将点光源转换为面光源的光学组件和将发光元件发出的光转换为白光的量子点层。
但是，包括量子点背光源的显示装置在显示时会出现色偏现象，降低了客户体验。例如，当发光元件发出的光为蓝光时，包括量子点背光源的显示装置在显示时，画面会发生偏蓝的现象。
经研究发现，包括量子点背光源的显示装置显示时发生色偏的原因如下。对于量子点材料而言，其光转换效率是固定的。当照射在量子点材料上的彩色光的亮度过大时，只能将其转换效率范围内的彩色光转换为白光，超出其转换效率的光仍然是彩色光。对于量子点背光源而言，当发光元件发出的光强度超出量子点层的转换效率时，就会出现部分彩色光被转换为白光，而部分彩色光未能被转换成白光的现象。相应地，会导致显示装置显示时出现色偏。
有鉴于此，作为本公开的一个方面，提供一种背光源。如图1和图2所示，所述背光源包括背板200、反射片300(参见图2)和多个发光元件110。如图2所示，背板200的内表面一侧限定有容纳空间，反射片300设置在背板的内表面上，发光元件110可以设置在容纳空间中(参见图1和图2)，也可以设置在背板200的一侧。其中，背光源还包括至少一个光修饰区，该光修饰区设置在反射片300上。光修饰区内包括至少一个光转换器件(如图1和图2中的点状结构)，光转换器件能够对发光元件110发出的光进行光学处理。
在一些实施例中，发光元件110所发出的光为单色光，光学处理是将单色光转化为混合光。例如，发光元件110发出的光为彩色的光(例如，蓝光、绿光等)。在一些具体示例中，发光元件能够发出蓝光，但本公开不限于此。发光元件110发出的光照射在光修饰区中的光转换器件上之后，光转换器件至少将部分彩色光转换为混合光。混合光为多种彩色光混合在一起形成的光。在一些具体示例中，混合光为白光。白光为一种混合光，可以由光谱三原色(蓝色光、红色光和绿色光)按一定比例混合得到，但本公开不限于此。为方便说明，以下以混合光为白光来进行说明。
本公开所提供的背光源与量子点层配合使用以形成背光模组，量子点层可以将发光元件发出的光转换为白光。
在光修饰区中，照射在光修饰区上的光包括发光元件直接照射在该光修饰区上的彩色光，也包括反射片300或者其他膜层结构反射在该光修饰区上的彩色光。相应地，当彩色光照射在光修饰区内的光转换器件上之后，该光转换器件至少可以将部分彩色光转换为白光，然后将转换后的白光朝向量子点层出射。由于从光修饰区出射的光在照射至量子点层之前已经有至少一部分被光修饰区中的光转换器件转换成白光，因此，照射在量子点层上的剩余未转换成白光的彩色光，可以由量子点层转换为白光。由此可知，设置光修饰区可以对量子点层的光转换能力进行补充，使得量子点层上与光修饰区对应的部分出射的光为纯度较高的白光，从而可以至少在一定程度上减轻包括所述背光源的显示装置在显示画面时的色偏现象。
在一些实施例中，光修饰区包含阵列排布的多个光转换器件。也就是说，在一个光修饰区中，可以包括多个光转换器件，而多个光转换器件可以呈阵列排布，如图3所示。当然，也可以按照需要以其他方式对多个光转换器件进行排布，本公开不限于此。
在一些实施例中，光转换器件包括量子点材料，且量子点材料能够将发光元件发出的光转换为白光。在本公开中，对如何利用量子点材料制成光转换器件并没有特殊的限制。例如，可以将量子点材料制成光学涂层，然后采用打印或者喷涂的方式形成所述光转换器件。当然，也可以采用其他能够将彩色光转换为白光的材料，本公开不限于此。在一些实施例中，背板200包括底板220和环绕底板220的边缘设置的侧壁210，侧壁210包括纵向侧壁211和横向侧壁212，光修饰区设置在位于侧壁210和底板220中至少一者上的反射片上。也就是说，在侧壁210的纵向侧壁211和/或横向侧壁212、和/或底板220上设置有光修饰区。在侧壁210和/或底板220上的反射片上设置光修饰区，可将照射/反射至相应位置的部分或全部彩色光转换为白光。
在一些实施例中，多个发光元件110在容纳空间的底板220上布置成多行多列，光修饰区包括多个第一光修饰区，多个第一光修饰区设置在横向侧壁和纵向侧壁中的至少一者上，其中，沿发光元件110的行方向设置在横向侧壁212上的第一光修饰区对应发光元件列，沿发光元件的列方向设置在纵向侧壁211上的第一光修饰区对应发光元件行，其中发光元件110的行方向与横向侧壁212平行，发光元件的列方向与纵向侧壁211平行。
此处的沿发光元件110的行方向设置在横向侧壁212上的第一光修饰区对应发光元件列，指的是设置在横向侧壁212上的第一光修饰区的中心位置与一列发光元件的各中心在同一直线上，并且该直线与纵向侧壁平行。例如，如图1所示，背板200的上侧的横向侧壁212上的第一个第一光修饰区(按照从左向右方向)的中心位置与底板220上的第一列发光元件(按照从左向右方向)的各中心在同一直线上。同理，沿发光元件的行方向设置在纵向侧壁211上的第一光修饰区对应发光元件行，指的是设置在纵向侧壁211上的第一光修饰区的中心位置与一行发光元 件的各中心在同一直线上，并且该直线与横向侧壁212平行。但本公开不限于此。
具体地，如图1所示，将多个发光元件110设置在底板220上时，该背光源作为直下式背光源。在该直下式背光源中，侧壁210向上弯折，与底板220形成一坡度角。底板220上的反射片300沿着弯折的侧壁210延伸到侧壁边缘。侧壁210的底端与底板220相连，侧壁210的顶端与光学膜层相邻接。光学膜层可以包括棱镜片、扩散片等。由于光学膜层朝向背板的表面也具有反光性能，并且，与反射片300在底板220上的部分相比，反射片300在侧壁210上的部分与光学膜层的距离更近，这就导致了侧壁处的亮度大于底板处的亮度。相应地，在本公开的一些实施例中，反射片300位于横向侧壁212上且与发光元件110的列相对的位置处设置有第一光修饰区122和反射片300位于纵向侧壁211上且与发光元件110的行相对的位置处均设置有第一光修饰区121，如图1所示。
反射片300在纵向侧壁211上的部分上的第一光修饰区121中的光转换器件可以将照射在该第一光修饰区的光的至少一部分转换为白光，避免包括背光源的背光模组中，从该区域出射的光发生白色不纯、偏彩色光的现象发生。同样地，反射片300在横向侧壁212上的部分上的第一光修饰区122中设置的光转换器件可以将照射在该第一光修饰区122的光的至少一部分转换为白光，避免包括背光源的背光模组中，从该区域出射的光发生白色不纯、偏彩色光的现象发生。
在本公开中，可以不对背光源的具体结构进行限制，该背光源还可以是侧入式背光源，即将发光元件110设置在底板220的一侧而不是设置在底板220上。
在一些实施例中，第一光修饰区中的多个光转换器件排布成多行多列，在同一个第一光修饰区中，光转换器件的尺寸与该第一光修饰区所对应的发光元件之间的距离反相关。具体地，如图1和图2所示，横向侧壁212的反射片300上的第一光修饰区122和纵向侧壁211的反射片300上的第一光修饰区121中的多个光转换器件均排布成多行多列。
受工艺水平的限制，背光源各个区域的亮度很难实现完全均匀。对 于背光源而言，亮度较大的区域的彩色光强度超出与该背光源配合的量子点层的转换效率的可能性较大，因此，在本公开的一些实施例中，可以将光修饰区设置在背光源上亮度较大的区域中，利用光修饰区先对亮度较大的区域的光进行转换，从而可以避免显示装置在显示时出现色彩不均匀的现象。
反射片位于侧壁的部分上，越靠近发光元件的位置亮度越大。相应地，与发光元件正对的区域的亮度也是整个背光源中亮度较大的区域。为了提高设置在反射片位于侧壁的部分上的第一光修饰区中出射的光色彩均匀性，在本公开的一些实施例中，侧壁的反射片上的第一光修饰区中，光转换器件的尺寸与该光转换器件与发光元件之间的距离反相关，即越靠近所述发光元件的光转换器件的尺寸越大，从而可以确保第一光修饰区出射的光色彩均匀。这是因为光转换器件的尺寸越大，则量子点材料越多，其转换效率也越高。
在本公开中，对发光元件的具体结构并不做特殊的限制。在本公开的一些具体示例中，发光元件可以包括发光二极管。容易理解的是，发光元件具有封装区。
在一些实施例中，在发光元件110包括封装区时，设置在横向侧壁212上的一个第一光修饰区沿行方向的宽度小于或等于发光元件110的封装区的宽度，设置在纵向侧壁211上的一个第一光修饰区沿列方向的宽度小于或等于发光元件110的封装区的宽度。
具体地，可以在侧壁210的反射片上与发光元件110相对、且位于发光元件110的封装区的宽度范围内的部分设置第一光修饰区，例如可以在该第一光修饰区内设置三行或三列光转换器件，且该三行或三列光转换器件的总宽度小于或等于发光元件的封装区的宽度，从而可以避免将过多的彩色光在射入到量子点层之前被转换为白光。当然，也可以限定光转换器件的直径小于发光元件的封装区的宽度的二分之一，这样可以在该第一光修饰区内设置至少两行或两列光转换器件。以上对应发光二极管的封装区设置的光转换器件，可以保证光学修饰点的最佳反射效果，减弱较强的彩色光区。
由于底板220上的相邻两行或两列发光元件发出的光之间存在光 的干涉，相应地干涉区位于相邻两行或两列发光元件之间，容易理解的是，干涉区的亮度大于与该干涉区相邻的区域的亮度。因此，在一些实施例中，还可以在干涉区设置第二光修饰区。
在一些实施例中，光修饰区还包括至少一个第二光修饰区，第二光修饰区设置在横向侧壁和纵向侧壁中的至少一者上，第二光修饰区与第一光修饰区相邻设置。例如，在横向侧壁上的第二光修饰区设置在相邻的两列发光元件之间；在纵向侧壁上的第二光修饰区设置在相邻的两行发光元件之间。具体地，如图4所示，可以将第二光修饰区设置在横向侧壁212上相邻的两个第一光修饰区122之间和/或纵向侧壁211上相邻的两个第一光修饰区121之间。即，反射片位于纵向侧壁211上且与任意相邻两行发光元件110之间的部分相对的位置处设置有第二光修饰区121’，和/或反射片300位于横向侧壁212上且与任意相邻两列发光元件之间的部分相对的位置设置有第二光修饰区122’。具体地，第二光修饰区121’的中心位置与任意相邻两行发光元件110之间的中心位置位于同一直线上，并且该直线与纵向侧壁平行。第二光修饰区122’的中心位置与任意相邻两列发光元件110之间的中心位置位于同一直线上，并且该直线与横向侧壁平行。
位于反射片300在纵向侧壁211的部分上的第二光修饰区121’可以将该区域的彩色光的至少一部分转换为白光，位于反射片300在横向侧壁212的部分上的第二光修饰区122’可以将该区域的彩色光的至少一部分转换为白光，从而可以减轻甚至避免因光的干涉而造成的色偏现象。
在一些实施例中，第二光修饰区内的多个光转换器件排布成多行多列，在同一个第二光修饰区中的光转换器件的尺寸与该第二光修饰区所对应的发光元件之间的距离反相关。具体地，如图4所示，在纵向侧壁211的部分上的第二光修饰区121’和横向侧壁212的部分上的第二光修饰区122’可以设置为多行多列，并且同一个第二光修饰区中的光转换器件的尺寸与该第二光修饰区所对应的发光元件之间的距离反相关。
当然，也可以在同一背板200上同时设置第一光修饰区和第二光修饰区，如图5所示。横向侧壁上的第二光修饰区122’的宽度可以设置 为与横向侧壁上的第一光修饰区的宽度相等，纵向侧壁上的第二光修饰区121’的宽度也可以设置为与纵向侧壁上的第一光修饰区的宽度相等，当然也可以根据需要设定各第二光修饰区的宽度。
如图6所示，在直下式的背光源中，背板200的底板220和侧壁210上均设置有反射片300，侧壁上的反射片300反射的光有一部分会被反射至底板220上的反射片300上。具体地，在反射片300位于底板220上的部分与反射片300位于侧壁210上的部分的相交处，亮度相对较大。为了避免从该区域出射的光发生色偏，在一些实施例中，所述光修饰区还包括第三光修饰区，第三光修饰区设置在底板靠近侧壁的边缘处的反射片上并与第一光修饰区相邻。
具体地，如图6所示，在反射片300位于底板220的边缘且与发光元件110的行相对的位置处，设置有第三光修饰区131，和/或反射片300位于底板220的边缘且与所述发光元件110的列相对的位置处设置有第三光修饰区132。
在反射片上，越靠近底板的边缘，亮度越大。为了将照射在该部分上的光转换成色彩均匀的光，在一些实施例中，第三光修饰区内的多个光转换器件排布成多行多列，在同一个第三光修饰区中的光转换器件的尺寸与该第三光修饰区所对应的发光元件之间的距离正相关。即，越靠近发光元件的光转换器件的尺寸越小。
当然，也可以在同一背板200上同时设置第一光修饰区、第二光修饰区和第三光修饰区，如图7所示。与横向侧壁平行的第三修饰区132的宽度可以设置为与横向侧壁上的第一光修饰区的宽度相等，并且第三光修饰区132的中心位置与一列发光元件各中心位置位于同一直线上；与纵向侧壁平行的第三光修饰区131的宽度也可以设置为与纵向侧壁上的第一光修饰区的宽度相等，并且第三光修饰区131的中心位置与一行发光元件各中心位置位于同一直线上。当然也可以根据需要设定各第三光修饰区的宽度。
在一些实施例中，光修饰区还包括至少一个第四光修饰区140，第四光修饰区140中的多个光转换器件排布成环绕相应的发光元件110。具体地，如图8中所示，可环绕每个发光元件110分别设置相应的第四 光修饰区140。
越靠近发光元件的区域亮度越大，在发光元件的周围设置第四光修饰区140，可以将照射到第四光修饰区区140上的彩色光的至少一部分转换为白光，从而可以防止与背光源配合的量子点层无法将该区域出射的光完全转换为白光，提高包括所述背光源的背光模组的白光纯度。
容易理解的是，在距离发光元件越近的区域，亮度越大，因此，在一些实施例中，第四光修饰区中的光转换器件的尺寸与该第四光修饰区所对应的发光元件之间的距离反相关。具体地，如图9所示，第四光修饰区140内的多个光转换器件排布成环绕相应的发光元件110，在同一个第四光修饰区中，光转换器件的尺寸与该第四光修饰区140所对应的发光元件110之间的距离反相关。即，越靠近发光元件110的光转换器件的尺寸越大。
在一些实施例中，发光元件110包括透镜器件111和发光二极管112，发光二极管112设置在底板220上，透镜器件111设置在发光二极管112的顶部，且透镜器件111与底板220上的反射片之间存在间隔，第四光修饰区140在反射片上的正投影落入透镜器件111在反射片上的正投影内。具体地，如图9所示，光转换器件位于透镜器件111在底板220上的正投影111’和发光二极管在底板220上的正投影112’之间。这样可以将发光二极管112发出的光以及通过透镜器件111折射/反射/投射的部分彩色光转换为白光。
当然，也可以在同一背板200上同时设置第一光修饰区、第二光修饰区、第三光修饰区和第四光修饰区，如图10所示。
在一些实施例中，在同一个第一光修饰区中、第二光修饰区中、第三光修饰区中以及第四光修饰区中，光转换器件交错排列。具体地，在同一个第一光修饰区中、第二光修饰区中以及第三光修饰区中，相邻两行光转换器件交错排列；或者相邻两列光转换器件交错排列，如图1-图7所示；在同一个第四光修饰区中，多个环的光转换器件交错排列，如图8和图9所示。相邻两(环)行光转换器件的(原点)交错排列或者相邻(环)两列光转换器件的(原点)交错排列，可以在光修饰区中设置尽可能多的光转换器件，以提高光修饰区的光转换效率。
在同一个第一光修饰区中，也可以将相邻两行光转换器件的原点交错排列；或者将相邻两列光转换器件的原点交错排列。需要指出的是，一列光转换器件的原点是指该列光转换器件一端的端点。同样地，一行光转换器件的原点是指该行光转换器件一端的端点。通过基于原点设置的光转换器件，其排布结果与图1-图7所示光转换器件的排布结果相同。
在一些实施例中，光转换器件的形状为圆形，第一光修饰区中、第二光修饰区中、第三光修饰区中以及第四光修饰区中的光转换器件的尺寸为光转换器件的直径。具体地，如图1-图7所示，每个光修饰区包含多个光转换器件，每个光转换器件的形状为圆形，多个光转换器件可以排布成多行或多列。当然，每个光转换器件也可以为其他诸如矩形、菱形等形状，本公开不限于此。
在同一个光修饰区中，在光转换器件的形状为圆形的情况下，光转换器件的尺寸与其直径相关，因此，可以通过限定光转换器件的直径来限定光转换器件的尺寸。
在本公开中，对发光元件发出的光的颜色并不做特殊的限定，作为一种实施方式，发光元件可以发出蓝光。相应地，光转换器件中的量子点可以将蓝光转换为白光。其中，所述量子点可以被蓝光激发为多种其它颜色，例如红色和绿色，且与蓝光共同结合并转换为白光。
在本公开中，可以根据具体需要设置光转换器件的位置。以下结合附图进一步对光转换器件的设置进行说明。
具体地，在图1中所示的实施方式中，反射片位于纵向侧壁211上且与发光元件110的行相对的位置设置有第一光修饰区121。反射片位于横向侧壁212上且与发光元件的列相对的位置设置有第一光修饰区122。
在图4所示的实施方式中，相邻两个第一光修饰区121之间设置有第二光修饰区121’，而无图1中的第一光修饰区121。相邻两个第一光修饰区122之间设置有第二光修饰区122’，而无图1中的第一光修饰区122。
在图5所示的实施方式中，该背板中同时包括图1和图4中的光修饰区。
在图6所示的实施方式中，反射片位于底板220的边缘处且与发光元件110的行对应的位置处设置有第三光修饰区131。反射片位于底板220的边缘处且与发光元件110的列对应的位置处设置有第三光修饰区132。
在图7所示的实施方式中，该背板中同时包括图1的第一光修饰区、图4中的第二光修饰区、图6中的第三光修饰区。也就是说，在图7所示的背板中，反射片位于纵向侧壁211上且与发光元件110的行相对的位置设置有第一光修饰区121。相邻两个第一光修饰区121之间设置有第二光修饰区121’。反射片位于横向侧壁212上且与发光元件的列相对的位置设置有第一光修饰区122。相邻两个第一光修饰区122之间设置有第二光修饰区122’。反射片位于底板220的边缘处且与发光元件110的行对应的位置处设置有第三光修饰区131。反射片位于底板220的边缘处且与发光元件110的列对应的位置处设置有第三光修饰区132。
在图8所示的实施方式中，反射片位于底板220的相应发光元件处设置第四光修饰区140。
在图10所示的实施方式中，该背板中同时包括图1的第一光修饰区、图4中的第二光修饰区、图6中的第三光修饰区和图8中的第四修饰区。也就是说，在图10所示的背板中，反射片位于纵向侧壁211上且与发光元件110的行相对的位置设置有第一光修饰区121。相邻两个第一光修饰区121之间设置有第二光修饰区121’。反射片位于横向侧壁212上且与发光元件的列相对的位置设置有第一光修饰区122。相邻两个第一光修饰区122之间设置有第二光修饰区122’。反射片位于底板220的边缘处且与发光元件110的行对应的位置处设置有第三光修饰区131。反射片位于底板220的边缘处且与发光元件110的列对应的位置处设置有第三光修饰区132。反射片位于底板220的部分上设置第四光修饰区140。
当然，本公开并不限于上述实施方式中的结构。
需要指出的是，虽然本公开中详细介绍了直下式的背光源，但是，本公开也可以适用于侧入式的背光源，即发光元件设置在背光源的侧壁，而光转换器件设置在邻近发光元件一侧的反射片上。
根据本公开的第二个方面，提供一种背光模组，所述背光模组包括背光源和量子点层。其中，所述背光源为本公开所提供的上述背光源。所述量子点层设置在背光源的出光侧。所述量子点层能够将发光元件发出的光转换为白光。
如上文中所述，设置在背光源中的光修饰区可以将照射在该光修饰区上的部分光转换为白光，剩余未转换成白光的彩色光在量子点层的转换效率范围之内。当未被光转换器件转换为白光的彩色光照射在量子点层上时，由所述量子点层转换为白光。非光影响区中未设置光转换器件，出射的光为亮度相对较低的彩色光，可以由量子点层转换为白光。
由此可知，本公开所提供的背光模组可以发出纯度较高的白光，从而可以避免包括所述背光模组的显示装置在显示时出现色偏，提高显示效果。
根据本公开的第三个方面，提供一种显示装置，所述显示装置包括显示面板和设置在所述显示面板入光侧的背光模组，其中，所述背光模组为本公开所提供的上述背光模组，所述量子点层位于所述背光源和所述显示面板之间。
由于所述背光模组可以发出纯度较高的白光，从而可以防止显示装置在显示时出现色偏现象，提高显示效果。
在本公开中，对显示面板的具体结构并不做特殊的限制。例如，显示面板可以是液晶显示面板，也可以是电纸书，还可以是电致变色显示面板等。
可以理解的是，以上实施方式仅仅是为了说明本公开的原理而采用的示例性实施方式，然而本公开并不局限于此。对于本领域内的普通技术人员而言，在不脱离本公开的精神和实质的情况下，可以做出各种变型和改进，这些变型和改进也视为本公开的保护范围。

Claims (22)

  1. 一种背光源，所述背光源包括背板、反射片和多个发光元件，所述背板的内表面一侧限定有容纳空间，所述反射片设置在所述背板的内表面上，其中，所述背光源还包括至少一个光修饰区，所述光修饰区设置在所述反射片上，所述光修饰区内包括至少一个光转换器件，所述光转换器件能够对所述发光元件发出的光进行光学处理。
  2. 根据权利要求1所述的背光源，其中，所述发光元件所发出的光为单色光，所述光学处理是将所述单色光转化为混合光。
  3. 根据权利要求2所述的背光源，其中，所述混合光为白光。
  4. 根据权利要求2所述的背光源，其中，所述光修饰区包含阵列排布的多个光转换器件。
  5. 根据权利要求4所述的背光源，其中，所述背板包括底板和环绕所述底板的边缘设置的侧壁，所述侧壁包括纵向侧壁和横向侧壁，所述光修饰区设置在位于所述侧壁和所述底板中至少一者上的反射片上。
  6. 根据权利要求5所述的背光源，其中，所述多个发光元件在所述容纳空间的底板上布置成多行多列，所述光修饰区包括多个第一光修饰区，所述多个第一光修饰区设置在所述横向侧壁和纵向侧壁中的至少一者上，其中，沿发光元件的行方向设置在所述横向侧壁上的第一光修饰区对应发光元件列，沿发光元件的列方向设置在所述纵向侧壁上的第一光修饰区对应发光元件行，其中所述发光元件的行方向与所述横向侧壁平行，所述发光元件的列方向与所述纵向侧壁平行。
  7. 根据权利要求6所述的背光源，其中，所述第一光修饰区中的 多个光转换器件排布成多行多列，在同一个所述第一光修饰区中，所述光转换器件的尺寸与该第一光修饰区所对应的发光元件之间的距离反相关。
  8. 根据权利要求7所述的背光源，其中，所述发光元件包括封装区，设置在所述横向侧壁上的第一光修饰区沿所述行方向的宽度小于或等于所述发光元件的封装区的宽度，设置在所述纵向侧壁上的第一光修饰区沿所述列方向的宽度小于或等于所述发光元件的封装区的宽度。
  9. 根据权利要求6至8之一所述的背光源，其中，所述光修饰区还包括至少一个第二光修饰区，所述第二光修饰区设置在所述横向侧壁和所述纵向侧壁中的至少一者上，所述第二光修饰区与所述第一光修饰区相邻设置。
  10. 根据权利要求9所述的背光源，其中，在所述横向侧壁上的第二光修饰区设置在相邻的两列发光元件之间；在所述纵向侧壁上的第二光修饰区设置在相邻的两行发光元件之间。
  11. 根据权利要求10所述的背光源，其中，所述第二光修饰区内的多个光转换器件排布成多行多列，在同一个所述第二光修饰区中的光转换器件的尺寸与该第二光修饰区所对应的发光元件之间的距离反相关。
  12. 根据权利要求6至11之一所述的背光源，其中，所述光修饰区还包括至少一个第三光修饰区，所述第三光修饰区设置在所述底板靠近所述侧壁的边缘处的反射片上并与所述第一光修饰区相邻。
  13. 根据权利要求12所述的背光源，其中，所述第三光修饰区内的多个光转换器件排布成多行多列，在同一个所述第三光修饰区中的光转换器件的尺寸与该第三光修饰区所对应的发光元件之间的距离正相 关。
  14. 根据权利要求5至13之一所述的背光源，其中，所述光修饰区还包括至少一个第四光修饰区，所述第四光修饰区中的多个所述光转换器件排布成环绕相应的发光元件。
  15. 根据权利要求14所述的背光源，其中，所述第四光修饰区中的光转换器件的尺寸与该第四光修饰区所对应的发光元件之间的距离反相关。
  16. 根据权利要求15所述的背光源，其中，所述发光元件包括透镜器件和发光二极管，所述发光二极管设置在所述底板上，所述透镜器件设置在所述发光二极管的顶部，且所述透镜器件与所述底板上的反射片之间存在间隔，
    所述第四光修饰区在所述反射片上的正投影落入所述透镜器件在所述反射片上的正投影内。
  17. 根据权利要求16所述的背光源，其中，在同一个所述第一光修饰区中、所述第二光修饰区中、所述第三光修饰区中以及所述第四光修饰区中，所述光转换器件交错排列。
  18. 根据权利要求17所述的背光源，其中，所述光转换器件的形状为圆形，所述第一光修饰区中、所述第二光修饰区中、所述第三光修饰区中以及所述第四光修饰区中的光转换器件的尺寸为光转换器件的直径。
  19. 根据权利要求1所述的背光源，其中，所述光转换器件包括量子点材料。
  20. 根据权利要求1所述的背光源，其中，所述发光元件能够发 出蓝光。
  21. 一种背光模组，所述背光模组包括背光源和量子点层，其中，所述背光源为权利要求1至20中任意一项所述的背光源，所述量子点层设置在所述背光源的出光侧，所述量子点层能够将发光元件发出的光转换为白光。
  22. 一种显示装置，所述显示装置包括显示面板和设置在所述显示面板入光侧的背光模组，其中，所述背光模组为权利要求21所述的背光模组，所述量子点层位于所述背光源和所述显示面板之间。
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