WO2023103084A1 - 显示面板及其制造方法 - Google Patents

显示面板及其制造方法 Download PDF

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Publication number
WO2023103084A1
WO2023103084A1 PCT/CN2021/140177 CN2021140177W WO2023103084A1 WO 2023103084 A1 WO2023103084 A1 WO 2023103084A1 CN 2021140177 W CN2021140177 W CN 2021140177W WO 2023103084 A1 WO2023103084 A1 WO 2023103084A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
light
emitting element
substrate
cholesteric liquid
Prior art date
Application number
PCT/CN2021/140177
Other languages
English (en)
French (fr)
Inventor
陈兴武
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
Priority to US17/622,827 priority Critical patent/US20230178683A1/en
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 JP2021577838A priority patent/JP2024505758A/ja
Publication of WO2023103084A1 publication Critical patent/WO2023103084A1/zh

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/02—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
    • H01L33/10—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a light reflecting structure, e.g. semiconductor Bragg reflector
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements
    • G09F9/33—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements being semiconductor devices, e.g. diodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L25/00—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof
    • H01L25/03—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes
    • H01L25/04—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers
    • H01L25/075—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00
    • H01L25/0753—Assemblies consisting of a plurality of individual semiconductor or other solid state devices ; Multistep manufacturing processes thereof all the devices being of a type provided for in the same subgroup of groups H01L27/00 - H01L33/00, or in a single subclass of H10K, H10N, e.g. assemblies of rectifier diodes the devices not having separate containers the devices being of a type provided for in group H01L33/00 the devices being arranged next to each other
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
    • H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission
    • H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars
    • H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components having potential barriers, specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/505—Wavelength conversion elements characterised by the shape, e.g. plate or foil
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2933/00—Details relating to devices covered by the group H01L33/00 but not provided for in its subgroups
    • H01L2933/0091—Scattering means in or on the semiconductor body or semiconductor body package
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/005—Processes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/44—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the coatings, e.g. passivation layer or anti-reflective coating
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
    • H01L33/502—Wavelength conversion materials
    • H01L33/504—Elements with two or more wavelength conversion materials
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/50—Wavelength conversion elements
    • H01L33/507—Wavelength conversion elements the elements being in intimate contact with parts other than the semiconductor body or integrated with parts other than the semiconductor body
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
    • H01L33/58—Optical field-shaping elements
    • H01L33/60—Reflective elements

Definitions

  • the present application relates to the field of display technology, in particular to a display panel and a manufacturing method thereof.
  • Micro Light-emitting Diode Micro Light-emitting Diode
  • Mini-LED sub-millimeter light-emitting diode
  • MLED Compared with LCD, MLED has the advantages of high contrast and high brightness.
  • the MLED light-emitting chip since the MLED light-emitting chip emits light laterally, the crosstalk between sub-pixels of different colors is serious.
  • black or white glue is applied to both sides of the MLED light-emitting chip.
  • white glue has limited absorption of light and cannot improve crosstalk, while black glue absorbs light and reduces the luminous utilization rate of MLEDs.
  • the present application provides a display panel and a manufacturing method thereof that can effectively reduce crosstalk and improve luminous utilization efficiency.
  • the present application provides a display panel, which includes a first substrate, and the first substrate includes:
  • the reflective part is arranged between two adjacent light-emitting elements, and the reflective part includes cholesteric liquid crystal.
  • the reflection part includes a polymer matrix and liquid crystal microcapsules dispersed in the polymer matrix, and the cholesteric liquid crystal is located in the liquid crystal microcapsules.
  • the cholesteric liquid crystal is planar cholesteric liquid crystal.
  • the reflection wavelength range of the cholesteric liquid crystal is 380nm-780nm.
  • the light-emitting element is a blue light-emitting element
  • the reflection wavelength range of the cholesteric liquid crystal is 400nm-500nm.
  • the display panel includes a display area and a non-display area, the non-display area is located on at least one side of the display area, a plurality of the light-emitting elements are arranged in the display area, and the reflective set in the non-display area.
  • the plurality of light-emitting elements include a first light-emitting element and a second light-emitting element, the color of light emitted by the first light-emitting element is different from that of the second light-emitting element, and the first light-emitting element
  • a first reflection part is provided between the second light-emitting element, the first reflection part includes a first cholesteric liquid crystal and a second cholesteric liquid crystal, and the first cholesteric liquid crystal is used to reflect the The light emitted by the first light emitting element, and the second cholesteric liquid crystal is used to reflect the light emitted by the second light emitting element.
  • the plurality of light-emitting elements further include a third light-emitting element, the colors of light emitted by the first light-emitting element, the second light-emitting element, and the third light-emitting element are different, and the first light-emitting element
  • a second reflection part is provided between the second light emitting element and the third light emitting element, the second reflection part includes a second cholesteric liquid crystal and a third cholesteric liquid crystal, and the second cholesteric liquid crystal is used for The light emitted by the second light emitting element is reflected, and the third cholesteric liquid crystal is used to reflect the light emitted by the third light emitting element.
  • the plurality of light emitting elements include a first light emitting element, a second light emitting element and a third light emitting element, and the first light emitting element, the second light emitting element and the third light emitting element emit The color of the light is different
  • the reflection part includes a first cholesteric liquid crystal, a second cholesteric liquid crystal and a third cholesteric liquid crystal
  • the first cholesteric liquid crystal is used to reflect the light emitted by the first light-emitting element
  • the second cholesteric liquid crystal is used to reflect the light emitted by the second light-emitting element
  • the third cholesteric liquid crystal is used to reflect the light emitted by the third light-emitting element.
  • the display panel further includes a second substrate, the second substrate is disposed opposite to the first substrate,
  • the second substrate includes a second substrate and a color filter layer
  • the color filter layer is disposed on a side of the second substrate close to the first substrate
  • the color filter layer includes a first color filter layer part, a second color filter part and a third color filter part
  • the first color filter part includes a first color filter block and a first color conversion block
  • the first color filter block is arranged on the second substrate close to the One side of the first substrate
  • the first color conversion block is arranged on the side of the first color filter block close to the first substrate
  • the second color filter part includes a second color filter block and a second color filter block.
  • the color conversion block, the second color filter block is arranged on the side of the second substrate close to the first substrate, the second color conversion block is arranged on the side of the second color filter block close to the first substrate, and the third color filter part includes The third color filter block and the light-transmitting block, the third color filter block is arranged on the side of the second substrate close to the first substrate, and the light-transmitting block is arranged on the side of the third color filter block close to the first substrate.
  • the light emitting element is a submillimeter light emitting diode chip or a micro light emitting diode chip.
  • the polymer matrix is selected from polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), One or more of polyvinyl chloride (PVC), polyamide (PA), polycarbonate (PC).
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • PS polystyrene
  • PE polyethylene
  • PVC polyvinyl chloride
  • PA polyamide
  • PC polycarbonate
  • liquid crystal microcapsules are circular or oval.
  • the present application provides a method for manufacturing a display panel, the display panel includes a first substrate, and the method for manufacturing the display panel includes:
  • a reflection part is formed between two adjacent light-emitting elements, and the reflection part includes cholesteric liquid crystal to obtain a first substrate.
  • the reflection part formed between two adjacent light-emitting elements, the reflection part including cholesteric liquid crystal includes:
  • liquid crystal microcapsules with a polymerizable monomer, a photoinitiator, a dispersant, and a solvent to obtain a reflective photoresist material;
  • the reflective photoresist material is coated between two adjacent light-emitting elements, and the reflective photoresist material is cured to obtain a reflective part.
  • the ratio of each component in the reflective liquid crystal material is: 60wt%-98wt% nematic liquid crystal, 0wt%-30wt% liquid crystal UV polymerizable monomer, 0.05wt%-11wt% % chiral compound, 0.05wt%-2.5wt% UV photoinitiator.
  • the method for making the reflective liquid crystal material into liquid crystal microcapsules is an emulsion method or a microfluidic method.
  • the making the reflective liquid crystal material into liquid crystal microcapsules includes:
  • reflective parts are provided between adjacent light-emitting elements, and the reflective parts contain reflective cholesteric liquid crystals, which can reflect light emitted by light-emitting elements, effectively reduce optical crosstalk, and improve light utilization efficiency.
  • FIG. 1 is a schematic top view of a display panel according to a first embodiment of the present application.
  • FIG. 2 is a cross-sectional view of the display panel of FIG. 1 along line A-A.
  • FIG. 3 is a schematic diagram of the reflectance at different wavelengths of the cholesteric liquid crystal used in the first embodiment of the present application.
  • FIG. 4 is a schematic top view of a display panel according to a second embodiment of the present application.
  • FIG. 5 is a cross-sectional view of the display panel of FIG. 4 along line A-A.
  • FIG. 6 is a schematic top view of a display panel according to a third embodiment of the present application.
  • FIG. 7 is a cross-sectional view of the display panel of FIG. 6 along line A-A.
  • FIG. 8 is a schematic top view of a display panel according to a fourth embodiment of the present application.
  • FIG. 9 is a cross-sectional view of the display panel of FIG. 8 along line A-A.
  • FIG. 10 is a flow chart of the manufacturing method of the display panel of the present application.
  • a first feature being “on” or “below” a second feature may include the first and second features directly, or may include that the first and second features are not directly connected but through another characteristic contact between them.
  • “above”, “above” and “above” the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature.
  • "Below”, “beneath” and “under” the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.
  • first and second are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features.
  • features defined as “first” and “second” may explicitly or implicitly include one or more features.
  • the present application provides a display panel and a manufacturing method of the display panel.
  • the display panel in the embodiment of the present application can be used in mobile phones, tablet computers, e-readers, electronic display screens, notebook computers, mobile phones, augmented reality (augmented reality, AR) ⁇ virtual reality (virtual reality, VR) devices, media players, wearable devices, digital cameras, car navigation systems, etc.
  • augmented reality augmented reality, AR
  • virtual reality virtual reality
  • the display panel provided by this application can be a Micro Light-emitting Diode (Micro-LED) display panel or a submillimeter light-emitting diode (Mini Light-emitting Diode, Mini-LED) display panel.
  • the display panel 100 includes a first substrate 10 and a second substrate 20 .
  • the first substrate 10 is opposite to the second substrate 20 .
  • the first substrate 10 is a light-emitting substrate
  • the second substrate 20 is a color filter substrate.
  • the first substrate 10 includes a first substrate 11 , a plurality of light emitting elements 12 disposed on the first substrate 11 and a reflective portion 13 disposed between two adjacent light emitting elements 12 .
  • the first substrate 11 may be glass, plastic or a flexible substrate.
  • a plurality of light emitting elements 12 can be arranged on the first substrate 11 in a matrix.
  • the light emitting element 12 can be a Micro-LED chip or a Mini-LED chip.
  • the plurality of light emitting elements 12 may be light emitting chips of the same color or different colors.
  • the plurality of light emitting elements 12 are all blue light emitting chips.
  • the reflection part 13 is used to reflect the light emitted by the light emitting elements 12 , so as to prevent crosstalk between the light emitted by two adjacent light emitting elements 12 .
  • the display panel 100 includes a display area DA and a non-display area NDA, and the non-display area NDA is located on at least one side of the display area DA.
  • the non-display area NDA is arranged around the display area DA.
  • a plurality of light emitting elements 12 are disposed in the display area DA, and the reflection part 13 may be located in the display area DA. In other implementation manners, the reflection part 13 may also be located in the display area DA and the non-display area NDA at the same time.
  • the area surrounding the matrix formed by the light emitting elements 12 is defined as the non-display area NDA.
  • the matrix formed by the light emitting elements 12 and the area between the light emitting elements 12 are defined as a display area DA.
  • the area occupied by the reflective portion 13 in FIG. 1 is the display area DA of the present application.
  • Reflecting portion 13 includes cholesteric liquid crystal 131 .
  • Cholesteric liquid crystal 131 is a kind of soft photonic crystal with periodic helical superstructure, which can selectively reflect light of different wavelengths to produce structural color.
  • the cholesteric liquid crystal 131 can be prepared by doping a photoresponsive chiral molecule in a nematic liquid crystal. Under the stimulation of the external light source, the spatial structure of the light-responsive chiral molecules changes, and the pitch of the helical superstructure is induced to change, thereby regulating the wavelength of light reflected by the cholesteric liquid crystal 131 .
  • the wavelength ⁇ of the reflected light of the cholesteric liquid crystal 131 satisfies the Bragg formula of crystal diffraction:
  • ⁇ is the wavelength of the reflected light
  • n is the average refractive index
  • p is the pitch of the cholesteric liquid crystal 131
  • ⁇ is the angle between the incident light and the liquid crystal surface.
  • the helical pitch P is the layer spacing that returns to the original direction after the directors of different layers rotate 360° along the helical direction.
  • the cholesteric liquid crystal 131 has a planar state and a focal conic state. Both the cholesteric liquid crystal 131 in the planar state and the focal conic state can reflect, and the cholesteric liquid crystal 131 in the planar state has a better reflection effect.
  • the cholesteric liquid crystal 131 is a planar cholesteric liquid crystal 131 . Since the selective reflection phenomenon of the planar state is very sensitive to the helical pitch of the liquid crystal, the helical pitch of the cholesteric liquid crystal 131 can be changed by adjusting the temperature or electric field, thereby controlling the reflective cholesteric liquid crystal 131 device to emit light of different colors.
  • the cholesteric liquid crystal 131 may be dispersed in the polymer matrix 132 to form liquid crystal microcapsules 130 .
  • the reflection part 13 includes a polymer matrix 132 and liquid crystal microcapsules 130 dispersed in the polymer matrix 132 .
  • the polymer matrix 132 may be selected from polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), polyvinyl chloride ( One or more of PVC), polyamide (PA), polycarbonate (PC).
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • PS polystyrene
  • PE polyethylene
  • PE polyvinyl chloride
  • PA polyamide
  • PC polycarbonate
  • the liquid crystal microcapsule 130 can be made into a circle or an ellipse, which can reflect light in different directions, and the step of aligning the cholesteric liquid crystal 131 can be omitted.
  • uniformly aligned liquid crystals have relatively high light transmittance, and after being made into liquid crystal microcapsules 130 , the light transmittance can be neglected under the action of reflection and scattering of liquid crystal microcapsules 130 .
  • an alignment layer for controlling the alignment direction of the cholesteric liquid crystal 131 can also be formed on the first substrate 11, and the alignment layer is located at the position where the reflection part 13 needs to be formed, such as the adjacent light emitting element 12 Then, a cholesteric liquid crystal 131 is disposed on the alignment layer to form a reflective portion 13 having the cholesteric liquid crystal 131 .
  • the reflection wavelength range of the cholesteric liquid crystal 131 is 380nm-780nm. That is, the cholesteric liquid crystal 131 can reflect all rays in the visible range. Since the light emitting element 12 in this embodiment is a blue light emitting element 12 , the reflection part 13 can reflect the light reflected by the light emitting element 12 . Preferably, since the light emitting element 12 of this embodiment is a blue light emitting element 12, the reflection wavelength range of the cholesteric liquid crystal 131 may be 400nm-500nm. That is, the cholesteric liquid crystal 131 may reflect blue light. Please refer to FIG. 3 . FIG.
  • FIG. 3 is a schematic diagram of reflectance at different wavelengths of a cholesteric liquid crystal 131 used in the first embodiment of the present application.
  • the abscissa is the wavelength of the incident light in nm
  • the ordinate is the reflectance in %.
  • the second substrate 20 includes a second substrate 21 and a color filter layer 22 disposed on the second substrate 21 .
  • the color filter layer 22 includes a first color filter portion 22G, a second color filter portion 22R, and a third color filter portion 22B.
  • the first color filter portion 22G, the second color filter portion 22R, and the third color filter portion 22B are sequentially arranged at intervals in the first direction D1.
  • a light-shielding layer 23 for preventing crosstalk is also arranged between adjacent color filter parts. Each light-shielding layer 23 is disposed corresponding to one reflective portion 13 .
  • each color filter part is set corresponding to one light emitting element 12 .
  • the first color filter portion 22G is a green color filter portion.
  • the second color filter portion 22R is a red color filter portion.
  • the third color filter portion 22B is a blue color filter portion.
  • the first color filter part 22G includes a first color filter block 222G and a first color conversion block 221G.
  • the second color filter part 22R includes a second color filter block 222R and a second color conversion block 221R, the second color filter block 222R is disposed on the side of the second substrate 20 close to the first substrate 10, and the second color conversion block 221R is disposed on The side of the second color filter block 222R is close to the first substrate 10 .
  • the second color filter block 222R is a red color filter block
  • the second color conversion block 221R includes a second transparent matrix 2211R and red quantum dots 2212R dispersed in the second transparent matrix 2211R.
  • the third color filter part 22B includes a third color filter block 222B and a second transparent matrix 2211R, the third color filter block 222B is arranged on the side of the second substrate 20 close to the first substrate 10, and the third transparent matrix 221B is arranged on the third The side of the color filter block 222B is close to the first substrate 10 .
  • the third color filter block 222B is a blue color filter block. Quantum dots may not be added in the third transparent matrix 221B.
  • the first color filter part 22G and the second color filter part 22R may also be referred to as a QDCF film. It can be understood that the color conversion particles in the color conversion block can also be other materials, such as fluorescent powder and the like.
  • the blue light-emitting element 12 emits blue light, and the blue light emitted by the light-emitting element 12 corresponding to the first color filter part 22G can be converted into green by the green quantum dot 2212G in the first color conversion block 221G, Then it is emitted through the color filter block.
  • the blue light emitted by the light emitting element 12 corresponding to the second color filter part 22R can be converted into red by the red quantum dots 2212R in the second color conversion block 221R, and then emitted through the color filter block.
  • the blue light emitted by the light emitting element 12 disposed corresponding to the third color filter portion 22B passes through the third transparent substrate 221B, and then is emitted through the third transparent substrate 221B.
  • the blue light emitted by the light emitting element 12 of the first color filter portion 22G is not only emitted in a super vertical direction, but also emitted obliquely or laterally.
  • the vertical direction here refers to a direction perpendicular to the first substrate 11 .
  • the oblique direction is a direction intersecting with the vertical direction but not perpendicular, and the lateral direction is a direction parallel to the first substrate 11 .
  • the reflective part 13 is provided between two adjacent light-emitting elements 12, the oblique or lateral rays of the blue light emitted by the light-emitting element 12 corresponding to the first color filter part 22G are reflected into the reflective part 13, and are reflected by the reflective part 13.
  • the cholesteric liquid crystal 131 in the reflection is incident into the first color filter part 22G corresponding to the light-emitting element 12, thereby avoiding blue light from being emitted into the second color filter part 22R and the third color filter part 22B, so that the second color filter part The part 22R and the third color filter part 22B leak light.
  • the white glue used in the prior art has poor absorption of light, especially blue light.
  • a cholesteric liquid crystal that selectively reflects blue light can be provided, which can improve the reflectivity of light and reduce the gap between adjacent sub-pixels. crosstalk and light leakage. And the light reflected by the reflective part can finally enter the corresponding color filter part, thereby improving the utilization rate of light emission.
  • the reflection part 13 is also disposed in the non-display area NDA.
  • the reflection part 13 containing the cholesteric liquid crystal 131 in the non-display area NDA surrounding the display area, the light emitted by the light-emitting element 12 to the non-display area NDA can be reflected into the display area, thereby improving the luminous efficiency.
  • the plurality of light emitting elements 12 may also be light emitting chips of different colors.
  • the plurality of light emitting elements 12 include blue light emitting chips, green light emitting chips and red light emitting chips.
  • the plurality of light emitting elements 12 include a blue light emitting chip, a green light emitting chip, a red light emitting chip and a light emitting chip of a fourth color.
  • the light emitting chip of the fourth color may be a white light emitting chip or a yellow light emitting chip.
  • the reflection part 13 of the present application may also be provided correspondingly.
  • the plurality of light emitting elements 12 include a first light emitting element 121 , a second light emitting element 122 and a third light emitting element 123 .
  • the colors of the lights emitted by the first light emitting element 121 , the second light emitting element 122 and the third light emitting element 123 are different.
  • a first reflection part 13A is provided between the first light emitting element 121 and the second light emitting element 122, and the first reflection part 13A includes a first cholesteric liquid crystal 1311 and a second cholesteric liquid crystal 1312, the first cholesteric liquid crystal 1311
  • the second cholesteric liquid crystal 1312 is used to reflect the light emitted by the second light emitting element 122 for reflecting the light emitted by the first light emitting element 121 .
  • a second reflection part 13B is provided between the second light emitting element 122 and the third light emitting element 123, and the second reflection part 13B includes a second cholesteric liquid crystal 1312 and a third cholesteric liquid crystal 1313, and the second cholesteric liquid crystal 1312
  • the third cholesteric liquid crystal 1313 is used for reflecting the light emitted by the second light-emitting element 122 and the light emitted by the third light-emitting element 123 . It can be understood that the first cholesteric liquid crystal 1311 , the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 all exist in the reflection part 13 in the form of liquid crystal microcapsules 130 .
  • the first cholesteric liquid crystal 1311, the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 can be made into different liquid crystal microcapsules 130 respectively, or can be located in the same liquid crystal microcapsule 130 in pairs. middle.
  • the plurality of light-emitting elements 12 include a first light-emitting element 121, a second light-emitting element 122, and a third light-emitting element 123.
  • the first light-emitting element 121 is a first light-emitting element 121.
  • the colors of the light emitted by the second light-emitting element 122 and the third light-emitting element 123 are different, and the reflection part 13 includes a first cholesteric liquid crystal 1311, a second cholesteric liquid crystal 1312, and a third cholesteric liquid crystal 1313, the first cholesteric liquid crystal 1311 is used to reflect the light emitted by the first light emitting element 121, the second cholesteric liquid crystal 1312 is used to reflect the light emitted by the second light emitting element 122, and the third cholesteric liquid crystal 1313 is used to reflect The light emitted by the third light emitting element 123 .
  • the first cholesteric liquid crystal 1311 , the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 can be in the same liquid crystal microcapsule 130 , or can be made into different liquid crystal microcapsules 130 respectively.
  • the first cholesteric liquid crystal 1311 , the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 can be made into different liquid crystal microcapsules 130 respectively, or can be located in the same liquid crystal microcapsule 130 .
  • the present application also provides a method for manufacturing a display panel, the display panel includes a first substrate, and the method for manufacturing the display panel includes:
  • the first substrate may be glass, plastic or flexible substrate.
  • a plurality of light emitting elements may be arranged in a matrix on the first substrate.
  • the light emitting element may be a Micro-LED chip or a Mini-LED chip.
  • the multiple light emitting elements may be light emitting chips of the same color or different colors.
  • the plurality of light emitting elements may be blue light emitting chips.
  • the reflection part includes cholesteric liquid crystal, and obtain a first substrate.
  • the specific method for forming the reflective portion between two adjacent light emitting elements may be spin coating, embossing or printing.
  • the reflection part is used to reflect the light emitted by the light emitting elements, so as to prevent crosstalk between the light emitted by two adjacent light emitting elements.
  • the display panel includes a display area and a non-display area, and the non-display area is located on at least one side of the display area.
  • the non-display area is arranged around the display area.
  • a plurality of light emitting elements are arranged in the display area, and the reflection part may be located in the display area.
  • the reflection part can also be located in the display area and the non-display area at the same time.
  • Step 103 may specifically include:
  • the ratio of each component in the reflective liquid crystal material is: 60wt%-98wt% nematic liquid crystal, 0wt%-30wt% liquid crystalline ultraviolet polymerizable monomer, 0.05wt%-11wt% % chiral compound, 0.05wt%-2.5wt% UV photoinitiator.
  • the above materials are mixed, heated and stirred to obtain a reflective liquid crystal material; the selective reflection band of the cholesteric liquid crystal is blue, as shown in Figure 3, through this ratio, a cholesteric liquid crystal with a reflection wavelength range of blue light can be obtained. Due to the single alignment direction of the nematic liquid crystal molecules, there will be no rotation.
  • the role of adding chiral compounds is to induce the rotation of liquid crystal molecules, thereby changing from nematic liquid crystals to cholesteric liquid crystals.
  • Chiral compounds are compounds with asymmetric centers.
  • the amount of the liquid crystalline ultraviolet polymerizable monomer can be 0wt%, and the liquid crystal microcapsules can be formed by intermolecular force or hydrophilicity and hydrophobicity.
  • a liquid crystalline ultraviolet polymerizable monomer can be added.
  • Cholesteric liquid crystals have a planar state and a focal conic state.
  • the cholesteric liquid crystals in the planar state and the focal conic state can both reflect, and the cholesteric liquid crystal in the planar state has a better reflection effect.
  • the cholesteric liquid crystal is preferably a planar cholesteric liquid crystal.
  • the reflection wavelength range of the cholesteric liquid crystal can be 400nm-500nm.
  • the reflection wavelength range of the cholesteric liquid crystal is 380nm-780nm.
  • the preparation method of liquid crystal microcapsules can be emulsion method, microfluidic method or other methods; taking emulsion method as an example, the mixed reflective liquid crystal material is dispersed into 10wt% polyvinyl alcohol (PVA) aqueous solution
  • PVA polyvinyl alcohol
  • the liquid crystal emulsion in water is prepared by magnetic stirring, and then the liquid crystal microcapsules are formed by steps such as ultraviolet polymerization, filtration, and washing.
  • steps 1031 and 1032 can be used to disperse the cholesteric liquid crystal in the polymer matrix to form liquid crystal microcapsules.
  • Liquid crystal microcapsules can be made into circular or elliptical shapes, which can reflect light in different directions, and do not need to align liquid crystals.
  • uniformly aligned liquid crystals have relatively high light transmittance, and after being made into liquid crystal microcapsules, the light transmittance can be neglected under the action of reflection and scattering of liquid crystal microcapsules.
  • an alignment layer for controlling the alignment direction of the cholesteric liquid crystal can also be formed on the first substrate in this application, and the alignment layer is located at a position where a reflection part needs to be formed, for example adjacent to Between the light-emitting elements, and then set the liquid crystal above the alignment layer to form a reflective part with cholesteric liquid crystal.
  • the type of cholesteric liquid crystal in the reflective part can be one type or multiple types for reflecting the light emitted by the light-emitting element.
  • the polymerizable monomer can be selected from polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), polychloride One or more monomers of vinyl (PVC), polyamide (PA), polycarbonate (PC).
  • PMMA polymethyl methacrylate
  • PET polyethylene terephthalate
  • PS polystyrene
  • PE polyethylene
  • PE polychloride
  • PVC polyvin
  • PA polyamide
  • PC polycarbonate
  • the reflection part includes a polymer matrix and liquid crystal microcapsules dispersed in the polymer matrix.
  • the cholesteric liquid crystal is located in the liquid crystal microcapsules.
  • the polymer monomers in step 1033 are polymerized into a polymer matrix.
  • the polymer matrix is selected from polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polystyrene (PS), polyethylene (PE), polyvinyl chloride (PVC), polyamide One or more of (PA), polycarbonate (PC).
  • step 103 it may also include the step of forming the second substrate 20, and aligning the first substrate 10 and the second substrate 20 to form a display panel.
  • the structure of the second substrate 20 may refer to the above-mentioned embodiment, which is omitted here. its description.
  • the manufacturing method of the display panel according to the first embodiment of the present application includes the following steps:
  • the plurality of light emitting elements 12 are all blue light emitting elements 12 .
  • 203 Form a reflective part 13 between two adjacent light emitting elements 12, and the reflective part 13 includes a cholesteric liquid crystal 131, to obtain a first substrate 10.
  • the reflective portion 13 is provided only in the display area DA.
  • the reflection wavelength range of the cholesteric liquid crystal can be 400nm-500nm. That is, the cholesteric liquid crystal 131 may reflect blue light. For example, a cholesteric liquid crystal having the reflection wavelength range shown in FIG. 3 .
  • step 203 includes:
  • the difference between the manufacturing method of the display panel according to the second embodiment of the present application and the manufacturing method of the display panel according to the first embodiment is that the reflective part 13 is also disposed in the non-display area NDA.
  • the difference between the manufacturing method of the display panel according to the third embodiment of the present application and the manufacturing method of the display panel according to the first embodiment is:
  • the plurality of light emitting elements 12 are also light emitting chips of different colors.
  • the plurality of light emitting elements 12 include blue light emitting chips, green light emitting chips and red light emitting chips.
  • the plurality of light emitting elements 12 include a blue light emitting chip, a green light emitting chip, a red light emitting chip and a light emitting chip of a fourth color.
  • the light emitting chip of the fourth color may be a white light emitting chip or a yellow light emitting chip.
  • the reflection part 13 of the present application may also be provided correspondingly.
  • the plurality of light emitting elements 12 include a first light emitting element 121 , a second light emitting element 122 and a third light emitting element 123 .
  • the colors of the lights emitted by the first light emitting element 121 , the second light emitting element 122 and the third light emitting element 123 are different.
  • a first reflection portion 13A is formed between the first light emitting element 121 and the second light emitting element 122 .
  • the first reflecting part 13A includes a first cholesteric liquid crystal 1311 and a second cholesteric liquid crystal 1312, the first cholesteric liquid crystal 1311 is used to reflect the light emitted by the first light-emitting element 121, and the second cholesteric liquid crystal 1312 is used to The light emitted by the second light emitting element 122 is reflected.
  • the second reflection part 13B is formed between the second light emitting element 122 and the third light emitting element 123.
  • the second reflection part 13B includes a second cholesteric liquid crystal 1312 and a third cholesteric liquid crystal 1313.
  • the second cholesteric liquid crystal 1312 The third cholesteric liquid crystal 1313 is used for reflecting the light emitted by the second light-emitting element 122 and the light emitted by the third light-emitting element 123 . It can be understood that the first cholesteric liquid crystal 1311 , the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 all exist in the reflection part 13 in the form of liquid crystal microcapsules.
  • the difference between the manufacturing method of the display panel of the fourth embodiment of the present application and the manufacturing method of the display panel of the first embodiment is:
  • the plurality of light emitting elements 12 include the first light emitting element 121, the second light emitting element 122 and the third light emitting element 123, and the light emitted by the first light emitting element 121, the second light emitting element 122 and the third light emitting element 123 The color of light varies.
  • the reflecting part 13 includes a first cholesteric liquid crystal 1311, a second cholesteric liquid crystal 1312 and a third cholesteric liquid crystal 1313, and the first cholesteric liquid crystal 1311 is used to reflect the light emitted by the first light emitting element 121.
  • the second cholesteric liquid crystal 1312 is used to reflect the light emitted by the second light emitting element 122
  • the third cholesteric liquid crystal 1313 is used to reflect the light emitted by the third light emitting element 123 .
  • the first cholesteric liquid crystal 1311 , the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 all exist in the reflection part 13 in the form of liquid crystal microcapsules.
  • the first cholesteric liquid crystal 1311 , the second cholesteric liquid crystal 1312 and the third cholesteric liquid crystal 1313 can be made into different liquid crystal microcapsules respectively, or can be located in the same liquid crystal microcapsule.

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Abstract

一种显示面板（100）及其制造方法，显示面板（100）包括第一基板（10），第一基板（10）包括第一衬底（11）、多个发光元件（12）以及反射部（13），多个发光元件（12）设置于第一衬底（11）的一侧，反射部（13）设置于相邻两个发光元件（12）之间，反射部（13）包括胆甾相液晶。

Description

显示面板及其制造方法 技术领域
本申请涉及显示技术领域，尤其涉及一种显示面板及其制造方法。
 背景技术
随着显示技术的快速发展，液晶显示（Liquid Dislay，LCD）目前成为了主流显示方案。但，微发光二极管（Micro Light-emitting Diode，Micro-LED）显示和次毫米发光二极管（Mini Light-emitting Diode，Mini-LED）（以下，将Micro-LED和Mini-LED统称为MLED）直显产品也逐渐兴起。
MLED相比LCD具有高对比、高亮度等优点。然而，在MLED显示中，由于MLED发光芯片横向发光，不同颜色的子像素之间串扰严重。通常为了降低串扰，会在MLED发光芯片两侧涂黑胶或者白胶。但白胶对光线的吸收有限，无法改善串扰，黑胶吸收光，降低MLED的发光利用率。
 技术问题
有鉴于此，本申请提供一种可有效降低串扰，同时提高发光利用率的显示面板及其制造方法。
 技术解决方案
本申请提供一种显示面板，其包括第一基板，所述第一基板包括：
第一衬底；
多个发光元件，设置于所述第一衬底的一侧；以及
反射部，设置于相邻两个所述发光元件之间，所述反射部包括胆甾相液晶。
在一种实施方式中，所述反射部包括聚合物基质和分散于所述聚合物基质中的液晶微胶囊，所述胆甾相液晶位于所述液晶微胶囊内。
在一种实施方式中，所述胆甾相液晶为平面态胆甾相液晶。
在一种实施方式中，所述胆甾相液晶的反射波长范围为380nm-780nm。
在一种实施方式中，所述发光元件为蓝色发光元件，所述胆甾相液晶的反射波长范围为400nm-500nm。
在一种实施方式中，所述显示面板包括显示区和非显示区，所述非显示区位于所述显示区的至少一侧，多个所述发光元件设置于所述显示区，所述反射部设置于所述非显示区。
在一种实施方式中，多个所述发光元件包括第一发光元件和第二发光元件，所述第一发光元件与所述第二发光元件发出的光的颜色不同，所述第一发光元件与所述第二发光元件之间设置有第一反射部，所述第一反射部包括第一胆甾相液晶和第二胆甾相液晶，所述第一胆甾相液晶用于反射所述第一发光元件发出的光，所述第二胆甾相液晶用于反射所述第二发光元件发出的光。
在一种实施方式中，多个所述发光元件还包括第三发光元件，所述第一发光元件、所述第二发光元件和所述第三发光元件发出的光的颜色不同，所述第二发光元件与所述第三发光元件之间设置有第二反射部，所述第二反射部包括第二胆甾相液晶和第三胆甾相液晶，所述第二胆甾相液晶用于反射所述第二发光元件发出的光，所述第三胆甾相液晶用于反射所述第三发光元件发出的光。
在一种实施方式中，多个所述发光元件包括第一发光元件、第二发光元件和第三发光元件，所述第一发光元件、所述第二发光元件和所述第三发光元件发出的光的颜色不同，所述反射部包括第一胆甾相液晶、第二胆甾相液晶和第三胆甾相液晶，所述第一胆甾相液晶用于反射所述第一发光元件发出的光，所述第二胆甾相液晶用于反射所述第二发光元件发出的光，所述第三胆甾相液晶用于反射所述第三发光元件发出的光。
在一种实施方式中，所述显示面板还包括第二基板，所述第二基板与所述第一基板相对设置，
其中，所述第二基板包括第二衬底和滤色层，所述滤色层设置于所述第二衬底靠近所述第一基板的一侧，所述滤色层包括第一滤色部、第二滤色部和第三滤色部，所述第一滤色部包括第一彩膜块和第一色转换块，所述第一彩膜块设置于所述第二基板靠近所述第一基板的一侧，所述第一色转换块设置于所述第一彩膜块靠近所述第一基板的一侧，所述第二滤色部包括第二彩膜块和第二色转换块，第二彩膜块设置于第二基板靠近第一基板的一侧，第二色转换块设置于第二彩膜块靠近第一基板的一侧，所述第三滤色部包括第三彩膜块和透光块，第三彩膜块设置于第二基板靠近第一基板的一侧，所述透光块设置于第三彩膜块靠近第一基板的一侧。
在一种实施方式中，所述发光元件为次毫米发光二极管芯片或者微发光二极管芯片。
在一种实施方式中，所述聚合物基质选自聚甲基丙烯酸甲酯（PMMA）、聚对苯二甲酸乙二醇酯(PET)、聚苯乙烯（PS）、聚乙烯（PE）、聚氯乙烯（PVC）、聚酰胺（PA）、聚碳酸酯(PC)中的一种或多种。
在一种实施方式中，所述液晶微胶囊为圆形或者椭圆形。
本申请提供一种显示面板的制造方法，所述显示面板包括第一基板，所述显示面板的制造方法包括：
提供第一衬底；
在所述第一衬底的一侧形成多个发光元件；以及
在相邻两个所述发光元件之间形成反射部，所述反射部包括胆甾相液晶，得到第一基板。
在一种实施方式中，所述在相邻两个所述发光元件之间形成反射部，所述反射部包括胆甾相液晶包括：
将向列相液晶、液晶性紫外可聚合单体、手性化合物、紫外光引发剂混合获得反射液晶材料；
将所述反射液晶材料制成液晶微胶囊；
将所述液晶微胶囊与可聚合单体、光引发剂、分散剂、溶剂混合获得反射光阻材料；
将所述反射光阻材料涂布在相邻两个所述发光元件之间，固化所述反射光阻材料得到反射部。
在一种实施方式中，所述反射液晶材料中各组分的配比为：60wt%-98wt%向列相液晶、0wt%-30wt%的液晶性紫外可聚合单体、0.05wt%-11wt%的手性化合物，0.05wt%-2.5wt%的紫外光引发剂。
在一种实施方式中，所述将所述反射液晶材料制成液晶微胶囊的方法为是乳液法或者微流控法。
在一种实施方式中，所述将所述反射液晶材料制成液晶微胶囊包括：
将所述反射式液晶材料分散到10wt%的聚乙烯醇水溶液中，搅拌制备水包液晶乳液，再通过聚合、过滤、清洗等步骤或者液晶微球。
 有益效果
本申请通过在相邻发光元件之间设置反射部，反射部包含反射性胆甾相液晶，能够反射发光元件发出的光线，有效降低光串扰，并提高光利用率。
 附图说明
为了更清楚地说明本申请中的技术方案，下面将对实施方式描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本申请的一些实施方式，对于本领域技术人员来讲，在不付出创造性劳动的前提下，还可以根据这些附图获得其他的附图。
图1为本申请第一实施方式的显示面板的俯视示意图。
图2为图1的显示面板沿A-A线的剖视图。
图3为本申请第一实施方式中使用的胆甾相液晶的不同波长下的反射率示意图。
图4为本申请第二实施方式的显示面板的俯视示意图。
图5为图4的显示面板沿A-A线的剖视图。
图6为本申请第三实施方式的显示面板的俯视示意图。
图7为图6的显示面板沿A-A线的剖视图。
图8为本申请第四实施方式的显示面板的俯视示意图。
图9为图8的显示面板沿A-A线的剖视图。
图10为本申请的显示面板的制造方法的流程图。
 本发明的实施方式
下面将结合本申请实施方式中的附图，对本申请中的技术方案进行清楚、完整地描述。显然，所描述的实施方式仅仅是本申请一部分实施方式，而不是全部的实施方式。基于本申请中的实施方式，本领域技术人员在没有做出创造性劳动前提下所获得的所有其他实施方式，都属于本申请保护的范围。
在本申请中，除非另有明确的规定和限定，第一特征在第二特征之“上”或之“下”可以包括第一和第二特征直接，也可以包括第一和第二特征不是直接连接而是通过它们之间的另外的特征接触。而且，第一特征在第二特征“之上”、“上方”和“上面”包括第一特征在第二特征正上方和斜上方，或仅仅表示第一特征水平高度高于第二特征。第一特征在第二特征“之下”、“下方”和“下面”包括第一特征在第二特征正下方和斜下方，或仅仅表示第一特征水平高度小于第二特征。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特征。
本申请提供一种显示面板以及显示面板的制造方法。本申请实施例中的显示面板可以用于手机、平板电脑、电子阅读器、电子展示屏、笔记本电脑、手机、增强现实(augmented reality，AR)\虚拟现实(virtual reality，VR)设备、媒体播放器、可穿戴设备、数码相机、车载导航仪等。
本申请提供的显示面板可以为微发光二极管（Micro Light-emitting Diode，Micro-LED）显示面板或次毫米发光二极管（Mini Light-emitting Diode，Mini-LED）显示面板。请参考图1和图2，显示面板100包括第一基板10和第二基板20。第一基板10与第二基板20相对设置。其中，第一基板10为发光基板，第二基板20为彩膜基板。
第一基板10包括第一衬底11，设置于第一衬底11上的多个发光元件12和设置于相邻两个发光元件12之间的反射部13。
第一衬底11可以是玻璃、塑料或者柔性基板。
多个发光元件12可以呈矩阵状排列在第一衬底11上。发光元件12可以为Micro-LED芯片或者Mini-LED芯片。可选的，多个发光元件12可以为同一颜色或者不同颜色的发光芯片。优选的，多个发光元件12均为蓝色发光芯片。
反射部13用于反射发光元件12发出的光线，从而防止相邻两个发光元件12之间发出的光产生串扰。进一步，显示面板100包括显示区DA和非显示区NDA，非显示区NDA位于显示区DA的至少一侧。在一个具体的实施方式中，非显示区NDA围绕显示区DA设置。多个发光元件12设置于显示区DA，反射部13可以位于显示区DA内。在其他实施方式中，反射部13也可以同时位于显示区DA和非显示区NDA。需要说明的是，本申请将围绕发光元件12构成的矩阵的区域定义为非显示区NDA。发光元件12构成的矩阵以及发光元件12之间的区域定义为显示区DA。图1中反射部13所占据的区域为本申请的显示区DA。
反射部13包括胆甾相液晶131。胆甾相液晶131是一类具有周期性螺旋超结构的软光子晶体，能够选择性地反射不同波长的光产生结构色。胆甾相液晶131可以通过在向列相液晶中掺杂光响应手性分子来制备。在外界光源的刺激下，光响应手性分子的空间结构改变，诱导螺旋超结构的螺距发生变化，从而调控胆甾相液晶131反射光的波长。胆甾相液晶131的反射光的波长λ满足晶体衍射的布拉格公式：
λ=2npsinφ。
式中，λ是反射光的波长，n是平均折射率，p是胆甾相液晶131的螺距，φ是入射光与液晶表面的夹角。螺距P为当不同层的指向矢沿螺旋方向旋转360°后，又回到初始方向的层间距。
胆甾相液晶131具有平面态和焦锥态。平面态和焦锥态的胆甾相液晶131都能反射，平面态的胆甾相反射效果更好。在本实施方式中，优选胆甾相液晶131为平面态胆甾相液晶131。由于平面态的选择性反射现象对于液晶的螺距非常敏感，所以可以通过调节温度或电场来改变胆甾相液晶131的螺距，从而控制反射式胆甾相液晶131器件发射不同颜色的光。
可选的，为了控制胆甾相液晶131的配向方向，可以将胆甾相液晶131分散于聚合物基质132中形成液晶微胶囊130。反射部13包括聚合物基质132和分散于聚合物基质132中的液晶微胶囊130。具体地，聚合物基质132可以选自聚甲基丙烯酸甲酯（PMMA）、聚对苯二甲酸乙二醇酯(PET)、聚苯乙烯（PS）、聚乙烯（PE）、聚氯乙烯（PVC）、聚酰胺（PA）、聚碳酸酯(PC)中的一种或多种。胆甾相液晶131位于液晶微胶囊130内。液晶微胶囊130可以做出圆形或者椭圆形，可以反射不同方向的光，并且可以省略对胆甾相液晶131配向的步骤。另一方面，均匀配向的液晶透光率较大，做成液晶微胶囊130后，在液晶微胶囊130的反射和散射作用下，透光可以忽略不计。
可以理解，在本申请中也可以在第一衬底11上形成用于控制胆甾相液晶131的配向方向的配向层，配向层位于需要形成反射部13的位置，例如相邻的发光元件12之间，然后在配向层上方设置胆甾相液晶131，形成具有胆甾相液晶131的反射部13。
可选的，胆甾相液晶131的反射波长范围为380nm-780nm。即，胆甾相液晶131可以反射可见光范围内的所有光线。由于本实施方式的发光元件12为蓝色发光元件12，反射部13可以反射发光元件12反射出的光。优选的，由于本实施方式的发光元件12为蓝色发光元件12，胆甾相液晶131的反射波长范围可以为400nm-500nm。即，胆甾相液晶131可以反射蓝色光。请参考图3，图3为本申请第一实施方式中使用的一种胆甾相液晶131的不同波长下的反射率示意图。其中，横坐标为入射光波长，单位为nm，纵坐标为反射率，单位为%。
第二基板20包括第二衬底21和设置于第二衬底21上的滤色层22。滤色层22包括第一滤色部22G、第二滤色部22R和第三滤色部22B。第一滤色部22G、第二滤色部22R和第三滤色部22B在第一方向D1上依次间隔排列设置。相邻滤色部之间还设置有防止串扰的遮光层23。每一遮光层23对应于一个反射部13设置。由于反射部13有可能会因为反射波长而产生结构色，因此，通过在反射部13的出光侧设置遮光层23，不仅能够防止相邻子像素之间串扰，还能挡住反射部13的结构色。每一滤色部分别对应一个发光元件12设置。具体地，第一滤色部22G为绿色滤色部。第二滤色部22R为红色滤色部。第三滤色部22B为蓝色滤色部。具体地，第一滤色部22G包括第一彩膜块222G和第一色转换块221G，第一彩膜块222G设置于第二基板20靠近第一基板10的一侧，第一色转换块221G设置于第一彩膜块222G靠近第一基板10的一侧。第一彩膜块222G为绿色彩膜块，第一色转换块221G包括第一透明基质2211G和分散于第一透明基质2211G中的绿色量子点2212G。第二滤色部22R包括第二彩膜块222R和第二色转换块221R，第二彩膜块222R设置于第二基板20靠近第一基板10的一侧，第二色转换块221R设置于第二彩膜块222R靠近第一基板10的一侧。第二彩膜块222R为红色彩膜块，第二色转换块221R包括第二透明基质2211R和分散于第二透明基质2211R中红色量子点2212R。第三滤色部22B包括第三彩膜块222B和第二透明基质2211R，第三彩膜块222B设置于第二基板20靠近第一基板10的一侧，第三透明基质221B设置于第三彩膜块222B靠近第一基板10的一侧。第三彩膜块222B为蓝色彩膜块。第三透明基质221B中可以不添加量子点。第一滤色部22G和第二滤色部22R也可以被称为QDCF膜。可以理解，色转换块中的色转换粒子也可以是其他材料，例如，荧光粉等。
在显示面板100工作时，蓝色的发光元件12发出蓝光，对应于第一滤色部22G设置的发光元件12发出的蓝光可以被第一色转换块221G中的绿色量子点2212G转换成绿色，再经过彩膜块发射出去。对应于第二滤色部22R设置的发光元件12发出的蓝光可以被第二色转换块221R中的红色量子点2212R转换成红色，再经过彩膜块发射出去。对应于第三滤色部22B设置的发光元件12发出的蓝光通过第三透明基质221B，再经过第三透明基质221B发射出去。当对应于第一滤色部22G的发光元件12开启，对应于第二滤色部22R和第三滤色部22B的发光元件12也开启时，同理，对应于第二滤色部22R和第三滤色部22B的发光元件12发出的光线被反射至各自对应的滤色部中，从而避免了相邻子像素之间发生串扰。当对应于第一滤色部22G的发光元件12开启，对应于第二滤色部22R和第三滤色部22B的发光元件12关闭时，第一滤色部22G第二滤色部22R对应于第一滤色部22G的发光元件12发出的蓝光不仅超竖直方向射出，斜向或者横向发出。这里的竖直方向是指垂直于第一衬底11的方向。斜向是与竖直方向相交但不垂直的方向，横向是指平行于第一衬底11的方向。由于相邻两个发光元件12之间设置有反射部13，对应于第一滤色部22G的发光元件12发出的蓝光中斜向或者横向发出的光线反射到反射部13中，被反射部13中的胆甾相液晶131反射射入与发光元件12对应的第一滤色部22G中，从而避免了蓝光发射至第二滤色部22R和第三滤色部22B中，使第二滤色部22R和第三滤色部22B漏光。
现有技术中使用的白胶对光线，特别是蓝光的吸收不好，本实施方式可以设置对蓝光进行选择性反射的胆甾相液晶，能够提高光线的反射率，降低相邻子像素之间的串扰和漏光。而被反射部反射的光最后还能进入对应的滤色部中，从而提高了发光利用率。
请参考图4和图5，在本申请的第二实施方式的显示面板100中，反射部13还设置于非显示区NDA。通过在围绕显示区设置的非显示区NDA设置含有胆甾相液晶131的反射部13，能够将发光元件12发射至非显示区NDA的光线反射至显示区中，提升发光效率。
请参考图6和图7，在本申请的第三实施方式的显示面板100中，多个发光元件12也可以为不同颜色的发光芯片。优选的，多个发光元件12包括蓝色发光芯片，绿色发光芯片和红色发光芯片。或者，多个发光元件12包括蓝色发光芯片，绿色发光芯片、红色发光芯片和第四种颜色的发光芯片。第四种颜色的发光芯片可以为白色发光芯片或者黄色发光芯片。根据不同的发光芯片，本申请的反射部13也可以对应设置。
具体地，多个发光元件12包括第一发光元件121、第二发光元件122以及第三发光元件123。第一发光元件121、第二发光元件122和第三发光元件123三者发出的光的颜色各不相同。第一发光元件121与第二发光元件122之间设置有第一反射部13A，第一反射部13A包括第一胆甾相液晶1311和第二胆甾相液晶1312，第一胆甾相液晶1311用于反射第一发光元件121发出的光，第二胆甾相液晶1312用于反射第二发光元件122发出的光。第二发光元件122与第三发光元件123之间设置有第二反射部13B，第二反射部13B包括第二胆甾相液晶1312和第三胆甾相液晶1313，第二胆甾相液晶1312用于反射第二发光元件122发出的光，第三胆甾相液晶1313用于反射第三发光元件123发出的光。可以理解，第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313均以液晶微胶囊130的方式存在于反射部13中。如图所示，第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313可以分别制作成不同的液晶微胶囊130，也可以两两位于同一个液晶微胶囊130中。
请参考图8和图9，在本申请的第四实施方式的显示面板100中，多个发光元件12包括第一发光元件121、第二发光元件122和第三发光元件123，第一发光元件121、第二发光元件122和第三发光元件123三者发出的光的颜色各不相同，反射部13包括第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313，第一胆甾相液晶1311用于反射第一发光元件121发出的光，第二胆甾相液晶1312用于反射第二发光元件122发出的光，第三胆甾相液晶1313用于反射第三发光元件123发出的光。如图所示，第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313可以在同一个液晶微胶囊130，也可以分别制作成不同的液晶微胶囊130。第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313可以分别制作成不同的液晶微胶囊130，也可以位于同一个液晶微胶囊130中。
请参考图10，本申请还提供一种显示面板的制造方法，显示面板包括第一基板，显示面板的制造方法包括：
101：提供第一衬底。
其中，第一衬底可以是玻璃、塑料或者柔性基板。
102：在第一衬底的一侧形成多个发光元件。
其中，多个发光元件可以呈矩阵状排列在第一衬底上。发光元件可以为Micro-LED芯片或者Mini-LED芯片。可选的，多个发光元件可以为同一颜色或者不同颜色的发光芯片。优选的，多个发光元件可以为蓝色发光芯片。
103：在相邻两个发光元件之间形成反射部，反射部包括胆甾相液晶，得到第一基板。
在相邻两个发光元件之间形成反射部的具体方法可以是旋涂、压印或打印等。反射部用于反射发光元件发出的光线，从而防止相邻两个发光元件之间发出的光产生串扰。进一步，显示面板包括显示区和非显示区，非显示区位于显示区的至少一侧。在一个具体的实施方式中，非显示区围绕显示区设置。多个发光元件设置于显示区，反射部可以位于显示区内。反射部也可以同时位于显示区和非显示区。
步骤103具体可以包括：
1031：将向列相液晶、液晶性紫外可聚合单体、手性化合物、紫外光引发剂混合获得反射液晶材料。
其中，在一个具体的实施方式中，反射液晶材料中各组分的配比为：60wt%-98wt%向列相液晶、0wt%-30wt%液晶性紫外可聚合单体、0.05wt%-11wt%的手性化合物，0.05wt%-2.5wt%的紫外光引发剂。将以上材料混合加热搅拌获得反射液晶材料；胆甾相液晶的选择性反射波段为蓝色，如图3所示，通过此配比，可以获得反射波长范围为蓝光的胆甾相液晶。由于向列相液晶分子单一配向方向，不会发生旋转，加入手性化合物的作用是诱导液晶分子旋转，从而从向列相液晶转变为胆甾相液晶，手性化合物是有不对称中心的化合物。液晶性紫外可聚合单体的量可以为0wt%，可以通过分子间作用力或者亲疏水性形成液晶微胶囊。但为了提高液晶微胶囊的稳定性，可以加入液晶性紫外可聚合单体。胆甾相液晶具有平面态和焦锥态。平面态和焦锥态的胆甾相液晶都能反射，平面态的胆甾相反射效果更好。在本实施方式中，优选胆甾相液晶为平面态胆甾相液晶。胆甾相液晶的反射波长范围可以为400nm-500nm。可选的，当显示面板的发光元件全部为蓝色发光元件时，胆甾相液晶的反射波长范围为380nm-780nm。
1032：将反射液晶材料制成液晶微胶囊。
在步骤1032中，液晶微胶囊制备方法可以是乳液法、微流控法或其他方法；以乳液法为例，将混配好的反射式液晶材料分散到10wt%的聚乙烯醇（PVA）水溶液中，通过磁力搅拌制备水包液晶乳液，再通过紫外聚合、过滤、清洗等步骤形成液晶微胶囊。
为了控制胆甾相液晶的配向方向，可以利用步骤1031和1032将胆甾相液晶分散于聚合物基质中形成液晶微胶囊。液晶微胶囊可以做出圆形或者椭圆形，可以反射不同方向的光，并且不需要对液晶进行配向。另一方面，均匀配向的液晶透光率较大，做成液晶微胶囊后，在液晶微胶囊的反射和散射作用下，透光可以忽略不计。可以理解，如果不设置液晶微胶囊，在本申请中也可以在第一衬底上形成用于控制胆甾相液晶的配向方向的配向层，配向层位于需要形成反射部的位置，例如相邻的发光元件之间，然后在配向层上方设置液晶，形成具有胆甾相液晶的反射部。
可以理解，根据使用的发光元件的颜色，反射部中的胆甾相液晶的种类可以为一种也可以为多种，用于反射发光元件发出的光。
1033：将液晶微胶囊与可聚合单体、光引发剂、分散剂、溶剂混合获得反射光阻材料。
在步骤1033中，可聚合单体可以选自聚甲基丙烯酸甲酯（PMMA）、聚对苯二甲酸乙二醇酯(PET)、聚苯乙烯（PS）、聚乙烯（PE）、聚氯乙烯（PVC）、聚酰胺（PA）、聚碳酸酯(PC)中的一种或多种的单体。
1034：将反射光阻材料涂布在相邻两个发光元件之间，固化反射光阻材料得到反射部。
反射部包括聚合物基质和分散于聚合物基质中的液晶微胶囊胆甾相液晶位于液晶微胶囊内。步骤1033中的聚合物单体发生聚合变成聚合物基质。聚合物基质选自聚甲基丙烯酸甲酯（PMMA）、聚对苯二甲酸乙二醇酯(PET)、聚苯乙烯（PS）、聚乙烯（PE）、聚氯乙烯（PVC）、聚酰胺（PA）、聚碳酸酯(PC)中的一种或多种。
另外，在步骤103之后，还可以包括形成第二基板20，以及将第一基板10与第二基板20对位形成显示面板的步骤，第二基板20的结构可以参考上述实施方式，在此省略其说明。
以下，对本申请的实施例的显示面板的制造方法进行具体说明。
请参考图1和图2，本申请第一实施方式的显示面板的制造方法包括以下步骤：
2101：提供第一衬底11。
2102：在第一衬底11的一侧形成多个发光元件12。
在本实施方式中，多个发光元件12均为蓝色发光元件12。
203：在相邻两个发光元件12之间形成反射部13，反射部13包括胆甾相液晶131，得到第一基板10。
在本实施方式中，反射部13仅设置在显示区DA中。胆甾相液晶的反射波长范围可以为400nm-500nm。即，胆甾相液晶131可以反射蓝色光。例如，具有图3所示的反射波长范围的胆甾相液晶。
具体地，步骤203包括：
2031：将向列相液晶、液晶性紫外可聚合单体、手性化合物、紫外光引发剂混合获得反射液晶材料。
2032：将反射液晶材料制成液晶微胶囊。
2033：将液晶微胶囊与可聚合单体、光引发剂、分散剂、溶剂混合获得反射光阻材料。
2034：将反射光阻材料涂布在相邻两个发光元件12之间，固化反射光阻材料得到反射部13。
请参考图4和图5，本申请第二实施方式的显示面板的制造方法与第一实施方式的显示面板的制造方法的不同点在于：反射部13还设置在非显示区NDA。
请参考图6和图7，本申请第三实施方式的显示面板的制造方法与第一实施方式的显示面板的制造方法的不同点在于：
在步骤2102中，多个发光元件12也为不同颜色的发光芯片。优选的，多个发光元件12包括蓝色发光芯片，绿色发光芯片和红色发光芯片。或者，多个发光元件12包括蓝色发光芯片，绿色发光芯片、红色发光芯片和第四种颜色的发光芯片。第四种颜色的发光芯片可以为白色发光芯片或者黄色发光芯片。根据不同的发光芯片，本申请的反射部13也可以对应设置。
具体地，多个发光元件12包括第一发光元件121、第二发光元件122以及第三发光元件123。第一发光元件121、第二发光元件122和第三发光元件123三者发出的光的颜色各不相同。
在步骤203中，第一发光元件121与第二发光元件122之间形成第一反射部13A。第一反射部13A包括第一胆甾相液晶1311和第二胆甾相液晶1312，第一胆甾相液晶1311用于反射第一发光元件121发出的光，第二胆甾相液晶1312用于反射第二发光元件122发出的光。在第二发光元件122与第三发光元件123之间形成第二反射部13B，第二反射部13B包括第二胆甾相液晶1312和第三胆甾相液晶1313，第二胆甾相液晶1312用于反射第二发光元件122发出的光，第三胆甾相液晶1313用于反射第三发光元件123发出的光。可以理解，第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313均以液晶微胶囊的方式存在于反射部13中。
请参考图8和图9，本申请第四实施方式的显示面板的制造方法与第一实施方式的显示面板的制造方法的不同点在于：
在步骤2102中，多个发光元件12包括第一发光元件121、第二发光元件122和第三发光元件123，第一发光元件121、第二发光元件122和第三发光元件123三者发出的光的颜色各不相同。
在步骤203中，反射部13包括第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313，第一胆甾相液晶1311用于反射第一发光元件121发出的光，第二胆甾相液晶1312用于反射第二发光元件122发出的光，第三胆甾相液晶1313用于反射第三发光元件123发出的光。第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313均以液晶微胶囊的方式存在于反射部13中。第一胆甾相液晶1311、第二胆甾相液晶1312和第三胆甾相液晶1313，可以分别制作成不同的液晶微胶囊，也可以位于同一个液晶微胶囊中。
以上对本申请实施方式提供了详细介绍，本文中应用了具体个例对本申请的原理及实施方式进行了阐述，以上实施方式的说明只是用于帮助理解本申请。同时，对于本领域的技术人员，依据本申请的思想，在具体实施方式及应用范围上均会有改变之处，综上所述，本说明书内容不应理解为对本申请的限制。

Claims (18)

  1. 一种显示面板，其中，包括第一基板，所述第一基板包括：
    第一衬底；
    多个发光元件，设置于所述第一衬底的一侧；以及
    反射部，设置于相邻两个所述发光元件之间，所述反射部包括胆甾相液晶。
  2. 如权利要求1所述的显示面板，其中，所述反射部包括聚合物基质和分散于所述聚合物基质中的液晶微胶囊，所述胆甾相液晶位于所述液晶微胶囊内。
  3. 如权利要求1所述的显示面板，其中，所述胆甾相液晶为平面态胆甾相液晶。
  4. 如权利要求1所述的显示面板，其中，所述胆甾相液晶的反射波长范围为380nm-780nm。
  5. 如权利要求1所述的显示面板，其中，所述发光元件为蓝色发光元件，所述胆甾相液晶的反射波长范围为400nm-500nm。
  6. 如权利要求1所述的显示面板，其中，所述显示面板包括显示区和非显示区，所述非显示区位于所述显示区的至少一侧，多个所述发光元件设置于所述显示区，所述反射部设置于所述非显示区。
  7. 如权利要求1所述的显示面板，其中，多个所述发光元件包括第一发光元件和第二发光元件，所述第一发光元件与所述第二发光元件发出的光的颜色不同，所述第一发光元件与所述第二发光元件之间设置有第一反射部，所述第一反射部包括第一胆甾相液晶和第二胆甾相液晶，所述第一胆甾相液晶用于反射所述第一发光元件发出的光，所述第二胆甾相液晶用于反射所述第二发光元件发出的光。
  8. 如权利要求7所述的显示面板，其中，多个所述发光元件还包括第三发光元件，所述第一发光元件、所述第二发光元件和所述第三发光元件发出的光的颜色不同，所述第二发光元件与所述第三发光元件之间设置有第二反射部，所述第二反射部包括第二胆甾相液晶和第三胆甾相液晶，所述第二胆甾相液晶用于反射所述第二发光元件发出的光，所述第三胆甾相液晶用于反射所述第三发光元件发出的光。
  9. 如权利要求1所述的显示面板，其中，多个所述发光元件包括第一发光元件、第二发光元件和第三发光元件，所述第一发光元件、所述第二发光元件和所述第三发光元件发出的光的颜色不同，所述反射部包括第一胆甾相液晶、第二胆甾相液晶和第三胆甾相液晶，所述第一胆甾相液晶用于反射所述第一发光元件发出的光，所述第二胆甾相液晶用于反射所述第二发光元件发出的光，所述第三胆甾相液晶用于反射所述第三发光元件发出的光。
  10. 如权利要求1所述的显示面板，其中，所述显示面板还包括第二基板，所述第二基板与所述第一基板相对设置，
    其中，所述第二基板包括第二衬底和滤色层，所述滤色层设置于所述第二衬底靠近所述第一基板的一侧，所述滤色层包括第一滤色部、第二滤色部和第三滤色部，所述第一滤色部包括第一彩膜块和第一色转换块，所述第一彩膜块设置于所述第二基板靠近所述第一基板的一侧，所述第一色转换块设置于所述第一彩膜块靠近所述第一基板的一侧，所述第二滤色部包括第二彩膜块和第二色转换块，第二彩膜块设置于第二基板靠近第一基板的一侧，第二色转换块设置于第二彩膜块靠近第一基板的一侧，所述第三滤色部包括第三彩膜块和透光块，第三彩膜块设置于第二基板靠近第一基板的一侧，所述透光块设置于第三彩膜块靠近第一基板的一侧。
  11. 如权利要求1所述的显示面板，其中，所述发光元件为次毫米发光二极管芯片或者微发光二极管芯片。
  12. 如权利要求1所述的显示面板，其中，所述聚合物基质选自聚甲基丙烯酸甲酯、聚对苯二甲酸乙二醇酯、聚苯乙烯、聚乙烯、聚氯乙烯、聚酰胺、聚碳酸酯中的一种或多种。
  13. 如权利要求1所述的显示面板，其中，所述液晶微胶囊为圆形或者椭圆形。
  14. 一种显示面板的制造方法，所述显示面板包括第一基板，其中，所述显示面板的制造方法包括：
    提供第一衬底；
    在所述第一衬底的一侧形成多个发光元件；以及
    在相邻两个所述发光元件之间形成反射部，所述反射部包括胆甾相液晶，得到第一基板。
  15. 如权利要求14所述的显示面板的制造方法，其中，
    所述在相邻两个所述发光元件之间形成反射部，所述反射部包括胆甾相液晶包括：
    将向列相液晶、液晶性紫外可聚合单体、手性化合物、紫外光引发剂混合获得反射液晶材料；
    将所述反射液晶材料制成液晶微胶囊；
    将所述液晶微胶囊与可聚合单体、光引发剂、分散剂、溶剂混合获得反射光阻材料；
    将所述反射光阻材料涂布在相邻两个所述发光元件之间，固化所述反射光阻材料得到反射部。
  16. 如权利要求15所述的显示面板的制造方法，其中，所述反射液晶材料中各组分的配比为：60wt%-98wt%向列相液晶、0wt%-30wt%的液晶性紫外可聚合单体、0.05wt%-11wt%的手性化合物，0.05wt%-2.5wt%的紫外光引发剂。
  17. 如权利要求15所述的显示面板的制造方法，其中，所述将所述反射液晶材料制成液晶微胶囊的方法为是乳液法或者微流控法。
  18. 如权利要求15所述的显示面板的制造方法，其中，所述将所述反射液晶材料制成液晶微胶囊包括：
    将所述反射式液晶材料分散到10wt%的聚乙烯醇水溶液中，搅拌制备水包液晶乳液，再通过聚合、过滤、清洗等步骤或者液晶微球。
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