WO2021243802A1 - 背光模块及其制作方法 - Google Patents

背光模块及其制作方法 Download PDF

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Publication number
WO2021243802A1
WO2021243802A1 PCT/CN2020/101013 CN2020101013W WO2021243802A1 WO 2021243802 A1 WO2021243802 A1 WO 2021243802A1 CN 2020101013 W CN2020101013 W CN 2020101013W WO 2021243802 A1 WO2021243802 A1 WO 2021243802A1
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WO
WIPO (PCT)
Prior art keywords
backlight module
light
ink
ink layer
content ratio
Prior art date
Application number
PCT/CN2020/101013
Other languages
English (en)
French (fr)
Inventor
付琳琳
李德华
张鑫
Original Assignee
Tcl华星光电技术有限公司
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 Tcl华星光电技术有限公司 filed Critical Tcl华星光电技术有限公司
Priority to US17/049,941 priority Critical patent/US11828968B2/en
Publication of WO2021243802A1 publication Critical patent/WO2021243802A1/zh

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133602—Direct backlight
    • G02F1/133603—Direct backlight with LEDs
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D17/00—Pigment pastes, e.g. for mixing in paints
    • C09D17/004—Pigment pastes, e.g. for mixing in paints containing an inorganic pigment
    • C09D17/007—Metal oxide
    • C09D17/008—Titanium dioxide
    • 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
    • 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
    • G02F1/133606—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
    • G02F1/133602—Direct backlight
    • G02F1/133611—Direct backlight including means for improving the brightness uniformity
    • 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
    • G02B6/0035—Means for improving the coupling-out of light from the light guide provided on the surface of the light guide or in the bulk of it
    • G02B6/004—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles
    • G02B6/0043—Scattering dots or dot-like elements, e.g. microbeads, scattering particles, nanoparticles provided on the surface 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
    • G02B6/0055—Reflecting 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
    • G02B6/0065—Manufacturing aspects; Material aspects
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0068—Arrangements of plural sources, e.g. multi-colour light sources
    • 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
    • G02B6/0066—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 characterised by the light source being coupled to the light guide
    • G02B6/0073—Light emitting diode [LED]

Definitions

  • the present invention relates to the field of display technology, in particular to a backlight module and a manufacturing method thereof.
  • the backlight of the traditional low-end liquid crystal display turns on when the light is turned on, and turns off when the light is turned off.
  • the brightness adjustment of the final picture depends on the light shielding of the liquid crystal display layer.
  • the contrast can reach 5000:1 at most, and the visual effect of the picture displayed by this contrast is not good.
  • the traditional mid-range LCD display will also achieve tens to hundreds of partitions Local Dimming products can better improve a certain contrast, but because the number of partitions is limited by LED Pitch (light-emitting diode pitch), etc., the displayed display effect often has halo, which affects the viewing quality.
  • Mini LED Mini Light Emitting Diode (miniature light-emitting diode) technology was born, Mini LED products can be divided into thousands or even tens of thousands, and the contrast ratio can be increased to 1 million:1, to achieve the best light and dark contrast display, compared with traditional display products. A qualitative leap.
  • the current of the current Mini LED backlight module is injected through a single aspect.
  • voltage line loss IR Drop
  • the embodiment of the present invention provides a backlight module and a manufacturing method thereof, which are used to improve the unevenness of the brightness display in the surface of the backlight module due to the brightness of the backlight module near the power input side being higher than the brightness of the backlight module far away from the power input side. problem.
  • the present invention provides a backlight module, including:
  • a substrate the substrate includes a first end and a second end that are oppositely arranged;
  • An ink layer the ink layer is disposed on the substrate, and the reflectivity of the ink layer gradually increases from the first end to the second end;
  • a plurality of light-emitting units at least two of the light-emitting units are arranged in an array on the ink layer.
  • the ink layer is formed by mixing white ink and metal oxide and then stirring.
  • the content of the white ink gradually decreases from the first end to the second end or the content of the metal oxide gradually decreases from the first end to the second end. Increase.
  • the metal oxide is at least one of titanium dioxide or aluminum oxide.
  • the ink layer in the direction in which the first end points to the second end, includes at least a first area and a second area, and the reflectivity of the first area is less than that of the first area. The reflectivity of the two regions.
  • the ratio of the light transmittance of any adjacent first area to the light transmittance of the second area is between 1 and 2.
  • the backlight module further includes:
  • the optical film is arranged on the light-emitting unit and used to transmit light emitted by the light-emitting unit.
  • the optical film includes a plurality of dot structures distributed in an array, and at least one light-emitting unit corresponds to the center of the dot structure distributed in an array.
  • the dot structure includes a convex lens structure.
  • the dot structure is composed of a plurality of protrusions, and at least two of the protrusions are arranged in an array.
  • the present invention also provides a method for manufacturing a backlight module, which includes the following steps:
  • Step A Provide a substrate, the substrate includes a first end and a second end that are arranged oppositely;
  • Step B forming an ink layer on the substrate, and the reflectivity of the ink layer gradually increases from the first end to the second end;
  • Step C forming a plurality of light-emitting units arranged in an array on the ink layer.
  • the step B includes:
  • Step b11 mixing white ink and metal oxide to form an ink material with a predetermined content ratio, wherein the predetermined content ratio includes at least a first predetermined content ratio and a second predetermined content ratio, and the white ink accounts for the first predetermined content ratio.
  • the content of the ink material at a predetermined content ratio is greater than the content of the ink material at the second predetermined content ratio of the white ink, or the metal oxide accounts for the first predetermined content ratio.
  • the content of the ink material is less than the content of the ink material in which the metal oxide accounts for the second predetermined content ratio;
  • Step b12 spraying the ink materials of the first predetermined content ratio and the second predetermined content ratio onto the substrate respectively to form the ink layer with a gradual increase in reflectivity, wherein the first A predetermined content ratio of the ink material is sprayed onto the substrate close to the first end, and the second predetermined content ratio of the ink material is sprayed onto the substrate away from the first end.
  • the metal oxide is at least one of titanium dioxide or aluminum oxide.
  • the ink layer in the direction in which the first end points to the second end, includes at least a first area and a second area, and the reflection of the first area The reflectivity is less than the reflectivity of the second region.
  • the ratio of the light transmittance of any adjacent first area to the light transmittance of the second area is between 1 and 2.
  • the manufacturing method of the backlight module further includes:
  • Step D An optical film is arranged on the light-emitting unit, and the optical film is used to transmit the light emitted by the light-emitting unit.
  • the optical film includes a plurality of dot structures distributed in an array, and at least one light-emitting unit corresponds to the center of the dot structure distributed in the array.
  • the dot structure includes a convex lens structure.
  • the dot structure is composed of a plurality of protrusions, and at least two of the protrusions are arranged in an array.
  • the height of the protrusion close to the light-emitting unit is smaller than the height of the protrusion far away from the light-emitting unit.
  • the backlight module provided by the present invention, an ink layer with a gradually increasing reflectivity is provided on a substrate, and the reflectivity of the ink layer gradually increases from the first end (the power-incoming side) to the second end (the side far from the power-incoming side). That is, the light that can pass through the ink layer gradually decreases from the first end to the second end, thereby improving the problem of uneven brightness display on the surface of the backlight module.
  • the present invention is provided with a white ink layer on the substrate. Because the ink layer has a high reflectivity, it can reflect the light emitted by the light-emitting unit to the optical film, and the ink layer can also reflect the optical film to the ink. The light of the layer is again reflected to the optical film, thereby improving the utilization rate of light. Furthermore, in the present invention, the ink layer is directly arranged on the substrate, which can replace the existing reflective sheet, thereby saving production cost.
  • the backlight module of the present invention also includes an optical film, by arranging a dot structure with different heights on the optical film.
  • the height of the protrusion is small, it is conducive to the diffusion of light; when the height of the protrusion away from the light-emitting unit is large, it is conducive to the concentration of light, so that the surface light source emits light uniformly.
  • FIG. 1 is a schematic structural diagram of a backlight module provided by an embodiment of the present invention
  • FIG. 2 is a cross-sectional view of a backlight module provided by an embodiment of the present invention.
  • 3 and 4 are flowcharts of steps of a method for manufacturing a backlight module provided by an embodiment of the present invention.
  • first and second are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with “first” and “second” may explicitly or implicitly include one or more of the features. In the description of the present application, "a plurality of" means two or more than two, unless otherwise specifically defined.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • connection should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected or integrally connected; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components.
  • the backlight module 100 includes a substrate 10, an ink layer 20 and a plurality of light emitting units 30.
  • the substrate 10 includes a first end 10a and a second end 10b which are arranged oppositely.
  • the ink layer 20 is disposed on the substrate 10, and the reflectivity of the ink layer 20 gradually increases from the first end 10a to the second end 10b.
  • At least two of the light-emitting units 30 are arranged in an array on the ink layer 20.
  • the substrate 10 is a glass substrate or a flexible substrate.
  • the light emitting unit 30 includes a Mini LED (Mini Light Emitting Diode, mini light emitting diode) light emitting unit.
  • the backlight module 100 includes a direct type Mini LED backlight module.
  • the ink layer 20 is formed by mixing white ink and metal oxide and then stirring.
  • the metal oxide is a material with high reflectivity such as titanium dioxide (titanium dioxide) or aluminum oxide.
  • the content of the white ink gradually decreases from the first end 10a to the second end 10b or the content of the metal oxide gradually increases from the first end 10a to the second end 10b.
  • the gradually increasing reflectivity of the ink layer 20 in the embodiment of the present invention is achieved by changing the ratio of the white ink and the metal oxide.
  • the content of the white ink is from the first end 10a to the second end 10a.
  • the two ends 10b gradually decrease.
  • the content of the metal oxide gradually increases from the first end 10a to the second end 10b.
  • the gradually increasing reflectivity of the ink layer 20 is not limited to being achieved by changing the ratio of the white ink and the metal oxide.
  • the ink layer 20 includes at least a first area 20a and a second area 20b.
  • the reflectivity is less than the reflectivity of the second region 20b.
  • the ratio of the reflectivity R1 of the first region 20a to the reflectivity R2 of the second region 20b is between 0 and 1 (not including 0 and 1).
  • the midpoint P of the first area 20a and the midpoint of the second area 20b The distance between points Q is d1.
  • the reflectivity of the ink layer 20 increases by N%.
  • the width of the first region 20a and the second region 20b in the embodiment of the present invention depends on actual requirements. The more uniform the transition between the reflectivity of the first region 20a and the reflectivity of the second region 20b, the better. That is, in the horizontal direction in which the first end 10a points to the second end 10b, the reflectance of the ink layer 20 gradually and slowly increases.
  • the ink layer 20 in the present invention is directly formed by an inkjet printing process, which not only can effectively improve the production efficiency, but also can save production costs.
  • the ink layer 20 formed by inkjet printing has high reliability and stability.
  • the light transmittance T1 of any adjacent first region 20a is greater than the light transmittance T2 of the second region 10b. That is, the light transmittance T1 of the first region 20a close to the first end 10a is greater than the light transmittance T1 of the second region 20b far from the first end 10a.
  • the ratio of T1 to T2 is between 1 and 2 (not including 1).
  • the ratio of T1 to T2 is between 1 and 1.1 (not including 1).
  • the ratio of T1 to T2 is 1.01 Any one of, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1.
  • the backlight module 100 in the embodiment of the present invention further includes an optical film 40 disposed on the light-emitting unit 30 for transmitting light emitted by the light-emitting unit 30.
  • the optical film 40 includes a plurality of dot structures 401 distributed in an array, and at least one of the light-emitting units 30 corresponds to the center of the dot structure 401 distributed in the array.
  • the dot structure 401 is arranged on the side of the optical film 40 away from the light-emitting unit 30.
  • the dot structure 401 is used to diffuse the light of the light emitting unit 30.
  • the dot structure 401 is a convex lens structure.
  • the dot structure 401 is composed of a plurality of protrusions 4011, and at least two of the protrusions 4011 are arranged in an array.
  • the height of the protrusion 4011 close to the light-emitting unit 30 in the embodiment of the present invention is smaller than the height of the protrusion 4011 far away from the light-emitting unit 30.
  • the height of the protrusion 4011 is small, it is good for light diffusion; the light intensity far away from the light-emitting unit 30 is small, and when the height of the protrusion 4011 is large, it is good for light gathering, so that the surface light source emits light uniformly.
  • the optical film is made of light-transmitting materials, specifically, including glass, polymethyl methacrylate and polycarbonate.
  • a convex lens is further provided on the side of the optical film 40 close to the light-emitting unit 30 for collecting the light emitted by the light-emitting unit 30.
  • the current of the Mini LED backlight module is connected from a single aspect, as the wiring distance increases, voltage line loss (IR Drop), so that the brightness of the backlight module near the power input side is higher than the brightness of the backlight module far away from the power input side, resulting in uneven brightness display on the surface of the backlight module of the backlight module 100.
  • an ink layer with a gradually increasing reflectivity is provided on a substrate, and the reflectivity of the ink layer gradually increases from the first end (the power-incoming side) to the second end (the side far from the power-incoming side).
  • the light that can pass through the ink layer gradually decreases from the first end to the second end, thereby improving the brightness of the backlight module due to the brightness of the backlight module near the power input side being higher than the brightness of the backlight module far away from the power input side.
  • the problem of uneven brightness is the problem of uneven brightness.
  • an embodiment of the present invention also provides a manufacturing method of a backlight module, including the following steps:
  • Step S1 Provide a substrate, the substrate includes a first end and a second end that are arranged oppositely;
  • the substrate 10 is a glass substrate or a flexible substrate.
  • Step S2 forming an ink layer on the substrate, and the reflectivity of the ink layer gradually increases from the first end to the second end;
  • the ink layer 20 is formed by mixing white ink and metal oxide and then stirring.
  • the metal oxide is titanium dioxide (titanium dioxide) or aluminum oxide.
  • the content of the white ink gradually decreases from the first end 10a to the second end 10b or the content of the metal oxide gradually increases from the first end 10a to the second end 10b. It should be noted that in order to achieve a gradual increase in reflectivity of the ink layer 20 from the first end 10a to the second end 10b, under the condition that the content of the metal oxide remains unchanged, the content of the white ink is from the first end 10a to the second end 10a. The two ends 10b gradually decrease. Or, when the content of the white ink is unchanged, the content of the metal oxide gradually increases from the first end 10a to the second end 10b.
  • Step S3 forming a plurality of light-emitting units arranged in an array on the ink layer.
  • the light emitting unit 30 includes a Mini LED (Mini Light Emitting Diode, mini light emitting diode) light emitting unit.
  • Mini LED Mini Light Emitting Diode, mini light emitting diode
  • Step S2 includes:
  • Step S21 mixing white ink and metal oxide to form an ink material with a predetermined content ratio, wherein the predetermined content ratio includes at least a first predetermined content ratio and a second predetermined content ratio, and the white ink accounts for the first predetermined content ratio.
  • the content of the ink material at a predetermined content ratio is greater than the content of the ink material at the second predetermined content ratio of the white ink, or the metal oxide accounts for the first predetermined content ratio.
  • the content of the ink material is less than the content of the ink material in which the metal oxide accounts for the second predetermined content ratio;
  • Step S22 spray the ink materials of the first predetermined content ratio and the second predetermined content ratio on the substrate respectively to form the ink layer with a gradually increasing reflectivity, wherein the first A predetermined content ratio of the ink material is sprayed onto the substrate close to the first end, and the second predetermined content ratio of the ink material is sprayed onto the substrate away from the first end.
  • step S21 the white inks with mass concentrations of c1 and c2 are mixed with the metal oxides of the same concentration and then stirred uniformly, where c1 is less than c2; or the white inks of the same concentration are mixed.
  • the ink and the metal oxides with mass concentrations of c3 and c4 are mixed and stirred uniformly, where c3 is greater than c4 to form an ink material with a first predetermined content ratio and an ink concentration with a second predetermined content ratio.
  • the ink material with the predetermined content ratio in the present invention includes at least the ink material with the first predetermined content ratio and the ink material with the second predetermined content ratio.
  • step S22 the ink material with the first predetermined content ratio and the ink material with the second predetermined content ratio are respectively placed in different nozzles, and the ink material with the first predetermined content ratio is sprayed close to each other by the inkjet printing process.
  • the substrate 10 at the first end 10a is sprayed with a second predetermined content ratio of ink material to the substrate 10 far from the first end 10b, and the ink layer 30 with a gradually increasing reflectivity is formed after heating and curing.
  • inkjet printing includes at least two nozzles, the inkjet printing speed of each nozzle is between 30 mm/sec and 200 mm/sec, and the ink output of the two nozzles is between 3 picoliters and 45 picoliters.
  • the ink jet frequency is 6 kHz to 12 kHz, and the distance between each nozzle and the surface of the ink layer 20 to be formed on the substrate 10 is between 0.5 mm and 2 mm.
  • the ink layer 20 includes at least a first area 20a and a second area 20b, and the reflectivity of the first area 20a is lower than that of the second area The reflectivity of 20b.
  • the ratio of the reflectivity R1 of the first region 20a to the reflectivity R2 of the second region 20b is between 0 and 1 (not including 0 and 1).
  • the midpoint P of the first area 20a and the midpoint of the second area 20b The distance between points Q is d1.
  • the reflectivity of the ink layer 20 increases by N%.
  • the width of the first region 20a and the second region 20b in the embodiment of the present invention depends on actual requirements. The more uniform the transition between the reflectivity of the first region 20a and the reflectivity of the second region 20b, the better. That is, in the horizontal direction in which the first end 10a points to the second end 10b, the reflectance of the ink layer 20 gradually and slowly increases.
  • the light transmittance T1 of any adjacent first region 20a is greater than the light transmittance T2 of the second region 10b. That is, the light transmittance T1 of the first region 20a close to the first end 10a is greater than the light transmittance T1 of the second region 20b far from the first end 10a.
  • the ratio of T1 to T2 is between 1 and 2 (not including 1).
  • the ratio of T1 to T2 is between 1 and 1.1 (not including 1).
  • the ratio of T1 to T2 is 1.01 Any one of, 1.02, 1.03, 1.04, 1.05, 1.06, 1.07, 1.08, 1.09, 1.1.
  • the method further includes disposing an optical film 40 on the light-emitting unit 30, and the optical film 40 is used to transmit the light emitted by the light-emitting unit 30.
  • the optical film 40 includes a plurality of dot structures 401 distributed in an array, and at least one light-emitting unit 30 corresponds to the center of the dot structure 401 distributed in an array.
  • the dot structure 401 is arranged on the side of the optical film 40 away from the light-emitting unit 30.
  • the dot structure 401 is used to diffuse the light of the light emitting unit 30.
  • the dot structure 401 is a convex lens.
  • the dot structure 401 is composed of a plurality of protrusions 4011, and at least two of the protrusions 4011 are arranged in an array.
  • the height of the protrusion 4011 close to the light-emitting unit 30 in the embodiment of the present invention is smaller than the height of the protrusion 4011 far away from the light-emitting unit 30.
  • the height of the protrusion 4011 is small, it is good for light diffusion; the light intensity far away from the light-emitting unit 30 is small, and when the height of the protrusion 4011 is large, it is good for light gathering, so that the surface light source emits light uniformly.
  • the optical film is made of light-transmitting materials, specifically, including glass, polymethyl methacrylate and polycarbonate.
  • a convex lens is further provided on the side of the optical film 40 close to the light-emitting unit 30 for collecting the light emitted by the light-emitting unit 30.
  • the current of the Mini LED backlight module is connected from a single aspect, as the wiring distance increases, voltage line loss (IR Drop), so that the brightness of the backlight module near the power input side is higher than the brightness of the backlight module far away from the power input side, resulting in uneven brightness display on the surface of the backlight module of the backlight module 100.
  • an ink layer with a gradually increasing reflectivity is provided on a substrate, and the reflectivity of the ink layer gradually increases from the first end (the power-incoming side) to the second end (the side far from the power-incoming side).
  • the light that can pass through the ink layer gradually decreases from the first end to the second end, thereby improving the brightness of the backlight module due to the brightness of the backlight module near the power input side being higher than the brightness of the backlight module far away from the power input side.
  • the problem of uneven brightness is the problem of uneven brightness.
  • the present invention is provided with a white ink layer on the substrate. Because the ink layer has a high reflectivity, it can reflect the light emitted by the light-emitting unit to the optical film, and the ink layer can also reflect the optical film to the ink. The light of the layer is again reflected to the optical film, thereby improving the utilization rate of light. Furthermore, in the present invention, the ink layer is directly arranged on the substrate, which can replace the existing reflective sheet, thereby saving production cost.
  • the backlight module of the present invention also includes an optical film, by arranging a dot structure with different heights on the optical film.
  • the height of the protrusion is small, it is conducive to the diffusion of light; when the height of the protrusion away from the light-emitting unit is large, it is conducive to the concentration of light, so that the surface light source emits light uniformly.

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Abstract

本发明提供一种背光模块及其制作方法，所述背光模块包括：基板，所述基板包括相对设置的第一端和第二端；油墨层，所述油墨层设置在所述基板上，所述油墨层的反射率从所述第一端至所述第二端渐变增大；多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。

Description

背光模块及其制作方法 技术领域
本发明涉及显示技术领域，尤其涉及一种背光模块及其制作方法。
 背景技术
传统的低端液晶显示器的背光开灯即亮，关灯即灭，最终画面的亮暗调节依赖于液晶显示层对光线的遮挡。但是，因受制于各种实际工艺，材料等等局限，其对比度最多能达到5000：1，这种对比度显示出来的画面的视觉效果不佳。传统的中端的液晶显示器也会做到几十至几百分区Local Dimming产品，可以较佳的提高一定的对比度，但是由于其分区数受LED Pitch（发光二极管的间距）等限制，呈现的显示效果经常会有光晕情况出现，影响了观看的画质。
所以，Mini LED（Mini Light Emitting Diode，微型发光二极管）技术孕育而生，Mini LED产品可以将分区做到几千甚至上万，把对比度提高到100万：1，实现最佳的明暗对比度显示，与传统显示器产品相比有了质的飞跃。
目前的Mini LED背光模块的电流是通过单一方面灌入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧背光模块的亮度，从而造成背光模块面内的亮度显示不均的问题。
故，有必要提出一种新的技术方案，以解决上述技术问题。
 技术问题
本发明实施例提供一种背光模块及其制作方法，用于改善由于近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度而造成背光模块面内的亮度显示不均的问题。
 技术解决方案
本发明提供一种背光模块，包括：
基板，所述基板包括相对设置的第一端和第二端；
油墨层，所述油墨层设置在所述基板上，所述油墨层的反射率从所述第一端至所述第二端渐变增大；
多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。
在本发明提供的背光模块中，所述油墨层由白色油墨和金属氧化物混合后搅拌形成。
在本发明提供的背光模块中，所述白色油墨的含量从所述第一端至所述第二端逐渐减少或所述金属氧化物的含量由所述第一端至所述第二端逐渐增加。
在本发明提供的背光模块中，所述金属氧化物为二氧化钛或氧化铝中的至少一者。
在本发明提供的背光模块中，在所述第一端指向所述第二端的方向上，所述油墨层至少包括第一区域和第二区域，所述第一区域的所述反射率小于第二区域的所述反射率。
在本发明提供的背光模块中，任意相邻的所述第一区域的光的透过率与所述第二区域的光的透过率的比值介于1至2之间。
在本发明提供的背光模块中，所述背光模块还包括：
光学膜片，所述光学膜片设置在所述发光单元上，用于透过所述发光单元发出的光线。
在本发明提供的背光模块中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
在本发明提供的背光模块中，所述网点结构包括凸面透镜结构。
在本发明提供的背光模块中，所述网点结构由多个凸起组成，至少两个所述凸起呈阵列排布。
本发明还提供一种背光模块的制作方法，包括如下步骤：
步骤A：提供一基板，所述基板包括相对设置的第一端和第二端；
步骤B：在所述基板上形成油墨层，所述油墨层的反射率由所述第一端至所述第二端渐变增大；
步骤C：在所述油墨层上形成阵列排布的多个发光单元。
在本发明提供的背光模块的制作方法中，所述步骤B包括：
步骤b11：将白色油墨和金属氧化物混合，形成预定含量比的油墨材料，其中，所述预定含量比至少包括第一预定含量比和第二预定含量比，且所述白色油墨占所述第一预定含量比的所述油墨材料的含量大于所述白色油墨占所述第二预定含量比的所述油墨材料的含量，或者，所述金属氧化物占所述第一预定含量比的所述油墨材料的含量小于所述金属氧化物占所述第二预定含量比的所述油墨材料的含量；
步骤b12：将所述第一预定含量比和所述第二预定含量比的所述油墨材料分别喷涂至所述基板上，以形成反射率渐变增大的所述油墨层，其中，所述第一预定含量比的所述油墨材料喷涂至靠近所述第一端的所述基板，所述第二预定含量比的所述油墨材料喷涂至远离所述第一端的所述基板。
在本发明提供的背光模块的制作方法中，所述金属氧化物为二氧化钛或氧化铝中的至少一者。
在本发明提供的背光模块的制作方法中，在所述第一端指向所述第二端的方向上，所述油墨层至少包括第一区域和第二区域，所述第一区域的所述反射率小于第二区域的所述反射率。
在本发明提供的背光模块的制作方法中，任意相邻的所述第一区域的光的透过率与所述第二区域的光的透过率的比值介于1至2之间。
在本发明提供的背光模块的制作方法中，所述背光模块的制作方法还包括：
步骤D：在所述发光单元上设置光学膜片，所述光学膜片用于透过所述发光单元发出的光。
在本发明提供的背光模块的制作方法中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
在本发明提供的背光模块的制作方法中，所述网点结构包括凸面透镜结构。
在本发明提供的背光模块的制作方法中，所述网点结构由多个凸起组成，至少两个所述凸起呈阵列排布。
在本发明提供的背光模块的制作方法中，靠近所述发光单元的所述凸起的高度小于远离所述发光单元的所述凸起的高度。
 有益效果
由于Mini LED背光模块的电流是从单一方面接入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度，导致背光模块100的背光模块面内的亮度显示不均。本发明提供的背光模块通过在基板上设置反射率渐变增大的油墨层，由于油墨层的反射率从第一端（进入电侧）至第二端（远离入电侧）渐变增大。即能够透过油墨层的光从第一端至第二端逐渐减小，从而改善背光模块面内的亮度显示不均的问题。
另外，本发明在基板上设置白色的油墨层，由于油墨层具有较高的反射率，能够将发光单元发出的光反射至光学膜片上，以及，油墨层还可以将光学膜片反射至油墨层的光再次反射至光学膜片上，从而提高光的利用率。再者，本发明将油墨层直接设置在基板上，可以替代现有的反射片，从而节约生产成本。
最后，本发明的背光模块还包括光学膜片，通过在光学膜片上设置具有高度不同的凸起的网点结构。当凸起的高度较小时，利于光的扩散；远离发光单当凸起的高度较大时，利于光的聚集，从而显示面光源均匀出光。
 附图说明
图1为本发明实施例提供背光模块的结构示意图；
图2为本发明实施例提供背光模块的剖面图；
图3和图4为本发明实施例提供的背光模块的制作方法的步骤流程图。
 本发明的实施方式
为了使本发明的目的、技术方案和优点更加清楚，下面将结合附图对本发明作进一步地详细描述，请参照附图中的图式，其中相同的组件符号代表相同的组件，以下的说明是基于所示的本发明具体实施例，其不应被视为限制本发明未在此详述的其他具体实施例。本说明书所使用的词语“实施例”意指实例、示例或例证。
在本申请的描述中，需要理解的是，术语“中心”、“纵向”、“横向”、“长度”、“宽度”、“厚度”、“上”、“下”、“前”、“后”、“左”、“右”、“竖直”、“水平”、“顶”、“底”、“内”、“外”、“顺时针”、“逆时针”等指示的方位或位置关系为基于附图所示的方位或位置关系，仅是为了便于描述本申请和简化描述，而不是指示或暗示所指的装置或元件必须具有特定的方位、以特定的方位构造和操作，因此不能理解为对本申请的限制。此外，术语“第一”、“第二”仅用于描述目的，而不能理解为指示或暗示相对重要性或者隐含指明所指示的技术特征的数量。由此，限定有“第一”、“第二”的特征可以明示或者隐含地包括一个或者更多个所述特征。在本申请的描述中，“多个”的含义是两个或两个以上，除非另有明确具体的限定。
在本申请的描述中，需要说明的是，除非另有明确的规定和限定，术语“安装”、“相连”、“连接”应做广义理解，例如，可以是固定连接，也可以是可拆卸连接，或一体地连接；可以是机械连接，也可以是电连接；可以是直接相连，也可以通过中间媒介间接相连，可以是两个元件内部的连通。对于本领域的普通技术人员而言，可以具体情况理解上述术语在本申请中的具体含义。
请参考图1，本发明实施例提供一种背光模块，背光模块100包括基板10、油墨层20和多个发光单元30。其中，所述基板10包括相对设置的第一端10a和第二端10b。所述油墨层20设置在所述基板10上，所述油墨层20的反射率从所述第一端10a至所述第二端10b渐变增大。至少两个所述发光单元30在所述油墨层20上阵列排布。其中，基板10为玻璃基板或柔性基板。发光单元30包括Mini LED（Mini Light Emitting Diode，微型发光二极管）发光单元。其中，背光模块100包括直下式Mini LED背光模块。
具体的，所述油墨层20由白色油墨和金属氧化物混合后搅拌形成。金属氧化物为二氧化钛（钛白粉）或氧化铝等具有高反射率的材料。其中，所述白色油墨的含量从所述第一端10a至所述第二端10b逐渐减少或所述金属氧化物的含量由所述第一端10a至所述第二端10b逐渐增加。也就是说，本发明实施例中油墨层20的渐变增大的反射率是通过改变白色油墨和金属氧化物的配比实现的。需要说明的是，为了实现油墨层20由第一端10a至第二端10b渐变增大的反射率，在金属氧化物的含量不变的情况下，白色油墨的含量从第一端10a至第二端10b逐渐减少。或者，在白色油墨的含量不变的情况下，金属氧化物的含量由第一端10a至第二端10b逐渐增加。但是，油墨层20的渐变增大的反射率不限于通过改变白色油墨和金属氧化物的配比实现的。
请继续参考图1，在所述第一端10a指向所述第二端10b的方向上，所述油墨层20至少包括第一区域20a和第二区域20b，所述第一区域20a的所述反射率小于第二区域20b的所述反射率。具体的，第一区域20a的反射率R1与第二区域20b的反射率R2的比值介于0和1之间（不包括0和1）。进一步的，因为背光模块的亮度衰减理论上是均匀递减的，因此，从基板10的第一端10a指向第二端10b的方向上，第一区域20a的中点P和第二区域20b的中点Q的间距为d1，若在Q点上的光强比P点的光强降低N%，则从P点至Q点，油墨层20的反射率增加N%。需要说明的是，本发明实施例中第一区域20a和第二区域20b的宽度视实际需求而定，第一区域20a的反射率与第二区域20b的反射率的值过渡越均匀越好，即，在第一端10a指向第二端10b的方向的水平的方向上，油墨层20的反射率是逐渐且缓慢变大的。
本发明中的油墨层20通过喷墨打印工艺直接形成，不仅可以有效提高制作效率，还可以节约生产成本。另外，通过喷墨打印形成的油墨层20具有较高的可靠性和稳定性。
需要说明的是，请继续参考图1或图2，任意相邻的第一区域20a的光的透过率T1大于第二区域10b的光的透过率T2。即靠近第一端10a的第一区域20a的光的透过率T1大于远离第一端10a的第二区域20b的光的透过率。其中，T1与T2的比值介于1至2之间（不包括1），优选的，T1与T2的比值介于1至1.1之间（不包括1），例如，T1与T2的比值为1.01、1.02、1.03、1.04、1.05、1.06、1.07、1.08、1.09、1.1中的任意一者。
请参考图2，本发明实施例中的背光模块100还包括光学膜片40，所述光学膜片40设置在所述发光单元30上，用于透过所述发光单元30发出的光线。其中，所述光学膜片40上包括多个阵列分布的网点结构401，至少一个所述发光单元30对应于所述阵列分布的网点结构401的中心。其中，网点结构401设置在光学膜片40远离发光单元30的一侧。网点结构401用于扩散发光单元30的光。网点结构401为凸面透镜结构。进一步的，所述网点结构401由多个凸起4011组成，至少两个所述凸起4011阵列排布。需要说明的是，本发明实施例中的靠近发光单元30的凸起4011的高度小于远离发光单元30的凸起4011的高度，其作用是，由于靠近发光单元30处光线强度较大，当凸起4011的高度较小时，利于光的扩散；远离发光单元30处光线强度较小，当凸起4011的高度较大时，利于光的聚集，从而显示面光源均匀出光。光学膜片由透光材料制成，具体的，包括玻璃、聚甲基丙烯酸甲酯和聚碳酸酯等。可选的，光学膜片40靠近发光单元30的一面还设置有凸透镜，用于聚集发光单元30发光的光。
由于Mini LED背光模块的电流是从单一方面接入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度，导致背光模块100的背光模块面内的亮度显示不均。本发明提供的背光模块通过在基板上设置反射率渐变增大的油墨层，由于油墨层的反射率从第一端（进入电侧）至第二端（远离入电侧）渐变增大。即能够透过油墨层的光从第一端至第二端逐渐减小，从而改善由于近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度而造成背光模块面内的亮度显示不均的问题。
请结合图1和图3，本发明实施例还提供一种背光模块的制作方法，包括如下步骤：
步骤S1：提供一基板，所述基板包括相对设置的第一端和第二端；
其中，基板10为玻璃基板或柔性基板。
步骤S2：在所述基板上形成油墨层，所述油墨层的反射率由所述第一端至所述第二端渐变增大；
其中，油墨层20由白色油墨和金属氧化物混合后搅拌形成。金属氧化物为二氧化钛（钛白粉）或氧化铝等。所述白色油墨的含量从所述第一端10a至所述第二端10b逐渐减少或所述金属氧化物的含量由所述第一端10a至所述第二端10b逐渐增加。需要说明的是，为了实现油墨层20由第一端10a至第二端10b渐变增大的反射率，在金属氧化物的含量不变的情况下，白色油墨的含量从第一端10a至第二端10b逐渐减少。或者，在白色油墨的含量不变的情况下，金属氧化物的含量由第一端10a至第二端10b逐渐增加。
步骤S3：在所述油墨层上形成阵列排布的多个发光单元。
其中，发光单元30包括Mini LED（Mini Light Emitting Diode，微型发光二极管）发光单元。
具体的，请参考图4，步骤S2包括：
步骤S21：将白色油墨和金属氧化物混合，形成预定含量比的油墨材料，其中，所述预定含量比至少包括第一预定含量比和第二预定含量比，且所述白色油墨占所述第一预定含量比的所述油墨材料的含量大于所述白色油墨占所述第二预定含量比的所述油墨材料的含量，或者，所述金属氧化物占所述第一预定含量比的所述油墨材料的含量小于所述金属氧化物占所述第二预定含量比的所述油墨材料的含量；
步骤S22：将所述第一预定含量比和所述第二预定含量比的所述油墨材料分别喷涂至所述基板上，以形成反射率渐变增大的所述油墨层，其中，所述第一预定含量比的所述油墨材料喷涂至靠近所述第一端的所述基板，所述第二预定含量比的所述油墨材料喷涂至远离所述第一端的所述基板。
例如，请参考图1和图2，在步骤S21中，将质量浓度为c1和c2的白色油墨分别和相同浓度的金属氧化物混合后搅拌均匀，其中，c1小于c2；或者将相同浓度的白色油墨和质量浓度为c3和c4的金属氧化物混合后搅拌均匀，其中，c3大于c4，形成第一预定含量比的油墨材料和第二预定含量比的油墨浓度。需要说明的是，本发明中预定含量比的油墨材料至少包括第一预定含量比的油墨材料和第二预定含量比的油墨材料，本发明根据白色油墨和金属氧化物不同配比，可以形成具有不同反射率的油墨层30。
然后，在步骤S22中，将第一预定含量比的油墨材料和第二预定含量比的油墨材料分别放置于不同的喷嘴内，利用喷墨打印工艺将第一预定含量比的油墨材料喷涂至靠近第一端10a的基板10，将第二预定含量比的油墨材料喷涂至远离第一端10b的基板10，加热固化后形成反射率渐变增大的所述油墨层30。其中，喷墨打印至少包括2个喷嘴，每个喷头的喷墨打印的速度介于30毫米/秒至200毫米/秒，2个喷头的出墨量均在3皮升～45皮升之间，喷墨频率为6kHz～12kHz，每个喷头与基板10的待形成的油墨层20的表面的距离介于0.5毫米至2毫米之间。
在所述第一端10a指向所述第二端10b的方向上，所述油墨层20至少包括第一区域20a和第二区域20b，所述第一区域20a的所述反射率小于第二区域20b的所述反射率。具体的，第一区域20a的反射率R1与第二区域20b的反射率R2的比值介于0和1之间（不包括0和1）。进一步的，因为背光模块的亮度衰减理论上是均匀递减的，因此，从基板10的第一端10a指向第二端10b的方向上，第一区域20a的中点P和第二区域20b的中点Q的间距为d1，若在Q点上的光强比P点的光强降低N%，则从P点至Q点，油墨层20的反射率增加N%。需要说明的是，本发明实施例中第一区域20a和第二区域20b的宽度视实际需求而定，第一区域20a的反射率与第二区域20b的反射率的值过渡越均匀越好，即，在第一端10a指向第二端10b的方向的水平的方向上，油墨层20的反射率是逐渐且缓慢变大的。
任意相邻的第一区域20a的光的透过率T1大于第二区域10b的光的透过率T2。即靠近第一端10a的第一区域20a的光的透过率T1大于远离第一端10a的第二区域20b的光的透过率。其中，T1与T2的比值介于1至2之间（不包括1），优选的，T1与T2的比值介于1至1.1之间（不包括1），例如，T1与T2的比值为1.01、1.02、1.03、1.04、1.05、1.06、1.07、1.08、1.09、1.1中的任意一者。
所述步骤S3之后，还包括在所述发光单元30上设置光学膜片40，所述光学膜片40用于透过所述发光单元30发出的光。其中，所述光学膜片40上包括多个阵列分布的网点结构401，至少一个所述发光单元30对应于所述阵列分布网点结构401的中心。其中，网点结构401设置在光学膜片40远离发光单元30的一侧。网点结构401用于扩散发光单元30的光。网点结构401为凸面透镜。进一步的，所述网点结构401由多个凸起4011组成，至少两个所述凸起4011阵列排布。需要说明的是，本发明实施例中的靠近发光单元30的凸起4011的高度小于远离发光单元30的凸起4011的高度，其作用是，由于靠近发光单元30处光线强度较大，当凸起4011的高度较小时，利于光的扩散；远离发光单元30处光线强度较小，当凸起4011的高度较大时，利于光的聚集，从而显示面光源均匀出光。光学膜片由透光材料制成，具体的，包括玻璃、聚甲基丙烯酸甲酯和聚碳酸酯等。可选的，光学膜片40靠近发光单元30的一面还设置有凸透镜，用于聚集发光单元30发光的光。
由于Mini LED背光模块的电流是从单一方面接入的，随着走线距离的增多，会产生电压线损（IR Drop），使得近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度，导致背光模块100的背光模块面内的亮度显示不均。本发明提供的背光模块通过在基板上设置反射率渐变增大的油墨层，由于油墨层的反射率从第一端（进入电侧）至第二端（远离入电侧）渐变增大。即能够透过油墨层的光从第一端至第二端逐渐减小，从而改善由于近入电侧的背光模块的亮度高于远离入电侧的背光模块的亮度而造成背光模块面内的亮度显示不均的问题。
另外，本发明在基板上设置白色的油墨层，由于油墨层具有较高的反射率，能够将发光单元发出的光反射至光学膜片上，以及，油墨层还可以将光学膜片反射至油墨层的光再次反射至光学膜片上，从而提高光的利用率。再者，本发明将油墨层直接设置在基板上，可以替代现有的反射片，从而节约生产成本。
最后，本发明的背光模块还包括光学膜片，通过在光学膜片上设置具有高度不同的凸起的网点结构。当凸起的高度较小时，利于光的扩散；远离发光单当凸起的高度较大时，利于光的聚集，从而显示面光源均匀出光。
综上所述，虽然本发明已以优选实施例揭露如上，但上述优选实施例并非用以限制本发明，本领域的普通技术人员，在不脱离本发明的精神和范围内，均可作各种更动与润饰，因此本发明的保护范围以权利要求界定的范围为准。

Claims (20)

  1. 一种背光模块，其中，包括：
    基板，所述基板包括相对设置的第一端和第二端；
    油墨层，所述油墨层设置在所述基板上，所述油墨层的反射率从所述第一端至所述第二端渐变增大；
    多个发光单元，至少两个所述发光单元在所述油墨层上阵列排布。
  2. 根据权利要求1所述的背光模块，其中，所述油墨层由白色油墨和金属氧化物混合后搅拌形成。
  3. 根据权利要求2所述的背光模块，其中，所述白色油墨的含量从所述第一端至所述第二端逐渐减少或所述金属氧化物的含量由所述第一端至所述第二端逐渐增加。
  4. 根据权利要求2所述的背光模块，其中，所述金属氧化物为二氧化钛或氧化铝中的至少一者。
  5. 根据权利要求1所述的背光模块，其中，在所述第一端指向所述第二端的方向上，所述油墨层至少包括第一区域和第二区域，所述第一区域的所述反射率小于第二区域的所述反射率。
  6. 根据权利要求5所述的背光模块，其中，任意相邻的所述第一区域的光的透过率与所述第二区域的光的透过率的比值介于1至2之间。
  7. 根据权利要求1所述的背光模块，其中，所述背光模块还包括：
    光学膜片，所述光学膜片设置在所述发光单元上，用于透过所述发光单元发出的光线。
  8. 根据权利要求7所述的背光模块，其中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
  9. 根据权利要求8所述的背光模块，其中，所述网点结构包括凸面透镜结构。
  10. 根据权利要求9所述的背光模块，其中，所述网点结构由多个凸起组成，至少两个所述凸起呈阵列排布。
  11. 一种背光模块的制作方法，其中，包括如下步骤：
    步骤A：提供一基板，所述基板包括相对设置的第一端和第二端；
    步骤B：在所述基板上形成油墨层，所述油墨层的反射率由所述第一端至所述第二端渐变增大；
    步骤C：在所述油墨层上形成阵列排布的多个发光单元。
  12. 根据权利要求11所述的背光模块的制作方法，其中，所述步骤B包括：
    步骤b11：将白色油墨和金属氧化物混合，形成预定含量比的油墨材料，其中，所述预定含量比至少包括第一预定含量比和第二预定含量比，且所述白色油墨占所述第一预定含量比的所述油墨材料的含量大于所述白色油墨占所述第二预定含量比的所述油墨材料的含量，或者，所述金属氧化物占所述第一预定含量比的所述油墨材料的含量小于所述金属氧化物占所述第二预定含量比的所述油墨材料的含量；
    步骤b12：将所述第一预定含量比和所述第二预定含量比的所述油墨材料分别喷涂至所述基板上，以形成反射率渐变增大的所述油墨层，其中，所述第一预定含量比的所述油墨材料喷涂至靠近所述第一端的所述基板，所述第二预定含量比的所述油墨材料喷涂至远离所述第一端的所述基板。
  13. 根据权利要求12所述的背光模块的制作方法，其中，所述金属氧化物为二氧化钛或氧化铝中的至少一者。
  14. 根据权利要求11所述的背光模块的制作方法，其中，在所述第一端指向所述第二端的方向上，所述油墨层至少包括第一区域和第二区域，所述第一区域的所述反射率小于第二区域的所述反射率。
  15. 根据权利要求11所述的背光模块的制作方法，其中，任意相邻的所述第一区域的光的透过率与所述第二区域的光的透过率的比值介于1至2之间。
  16. 根据权利要求11所述的背光模块的制作方法，其中，所述背光模块的制作方法还包括：
    步骤D：在所述发光单元上设置光学膜片，所述光学膜片用于透过所述发光单元发出的光。
  17. 根据权利要求16所述的背光模块的制作方法，其中，所述光学膜片上包括多个阵列分布的网点结构，至少一个所述发光单元对应于所述阵列分布网点结构的中心。
  18. 根据权利要求17所述的背光模块的制作方法，其中，所述网点结构包括凸面透镜结构。
  19. 根据权利要求18所述的背光模块的制作方法，其中，所述网点结构由多个凸起组成，至少两个所述凸起呈阵列排布。
  20. 根据权利要求19所述的背光模块的制作方法，其中，靠近所述发光单元的所述凸起的高度小于远离所述发光单元的所述凸起的高度。
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