WO2020199269A1 - 改善光阻附着力的方法 - Google Patents

改善光阻附着力的方法 Download PDF

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WO2020199269A1
WO2020199269A1 PCT/CN2019/083613 CN2019083613W WO2020199269A1 WO 2020199269 A1 WO2020199269 A1 WO 2020199269A1 CN 2019083613 W CN2019083613 W CN 2019083613W WO 2020199269 A1 WO2020199269 A1 WO 2020199269A1
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polyimide
alignment material
photopolymerizable
photo
liquid crystal
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French (fr)
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张宇
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TCL China Star Optoelectronics Technology Co Ltd
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Shenzhen China Star Optoelectronics Technology Co Ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • 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
    • G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
    • 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
    • G02F1/1341—Filling or closing of cells

Definitions

  • the present invention relates to a photo-alignment material, and particularly relates to a photo-alignment material that can shorten the alignment time and its application.
  • the current polymer stabilized vertical alignment (PS-VA) technology is to mix the photopolymerizable group (reactive monomer, RM) in the liquid crystal, which requires a long time UV process to remove the residual photopolymerization Group to ensure the reliability of the display device.
  • the photopolymerizable group is grafted to the polyimide (PI) side chain, so that the photopolymerizable group is in a non-free state and can be exposed to the first ultraviolet light (UV1 ) After the alignment is completed, there is no need to perform the second ultraviolet light (UV2) process.
  • UV1 first ultraviolet light
  • UV2 second ultraviolet light
  • a photo-alignment material including: a polyimide (PI); a plurality of photopolymerizable groups bonded to the polyimide; and a plurality of photoinitiators The agent is bonded to the polyimide.
  • PI polyimide
  • photoinitiators The agent is bonded to the polyimide.
  • a method for manufacturing a liquid crystal display including: providing a photo-alignment material; coating the photo-alignment material on a pair of substrates, wherein each of the pair of substrates includes An electrode; the pair of substrates coated with the photo-alignment material are subjected to a pre-baking and a post-baking process; and the pair of pre-baked and post-baked substrates are subjected to a liquid crystal One drop filling (ODF) process to obtain the liquid crystal display, wherein the photo-alignment material includes: a polyimide (PI); a plurality of photopolymerizable groups are bonded to the The polyimide; and a plurality of photoinitiators are bonded to the polyimide.
  • PI polyimide
  • photoinitiators are bonded to the polyimide.
  • the plurality of photopolymerizable groups are ultraviolet light polymerizable groups; preferably, the plurality of photopolymerizable groups include at least one of the following: a wavelength of 313nm The photopolymerizable group and the photopolymerizable group with a wavelength of 365nm.
  • the manufacturing method of the liquid crystal display further includes a liquid crystal pretilt process, including the following steps: using a 340nm filter to filter out light with a wavelength less than 340nm; using a wavelength greater than 340nm
  • the liquid crystal display is irradiated with ultraviolet light of 313 nm to cause the photopolymerizable group with a wavelength of 365 nm to react to form a predetermined topography on the surface of the PI; and a voltage is applied to irradiate 313 nm ultraviolet light to make the liquid crystal Pretilt.
  • the irradiation condition of the ultraviolet light with a wavelength greater than 340 nm is 5-20 mW/cm2.
  • the plurality of photopolymerizable groups are bonded to the side chain of the polyimide; and the plurality of photoinitiators are bonded to the side chain of the polyimide .
  • the plurality of photoinitiators include at least one of the following: azo initiators, organic peroxy initiators, and inorganic peroxy initiators; preferably, the plurality of photoinitiators
  • the photoinitiator includes at least one of the following: persulfate, hydroperoxide, dioxane-based compound, diacyl peroxide-based compound, peroxydicarbonate-based compound, and combinations thereof.
  • the invention provides a photo-alignment material, a method for preparing a liquid crystal display, and a photo-alignment method.
  • a photo-alignment material of the present invention by grafting a photoinitiator to a side chain, free radicals are generated under the action of light to accelerate the reaction between RMs and achieve the purpose of shortening the alignment time.
  • Fig. 1 is a schematic structural diagram of an optical alignment material according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of the photo-alignment material applied to a liquid crystal display according to an embodiment of the present invention.
  • the invention provides a photo-alignment material, a method for preparing a liquid crystal display, and a photo-alignment method.
  • a photo-alignment material of the present invention by grafting a photoinitiator to a side chain, free radicals are generated under the action of light to accelerate the reaction between the photopolymerizable groups (RM) and achieve the purpose of shortening the alignment time.
  • RM photopolymerizable groups
  • a photo-alignment material including: a polyimide (PI); a plurality of photopolymerizable groups are bonded to the polyimide; and A photoinitiator is bonded to the polyimide.
  • PI polyimide
  • a photoinitiator is bonded to the polyimide.
  • Fig. 1 is a schematic structural diagram of an optical alignment material according to an embodiment of the present invention.
  • the photo-alignment material 10 according to an embodiment of the present invention includes: a polyimide 20; a plurality of photopolymerizable groups (RM) 30 are bonded to the polyimide ( PI) 20; and a plurality of photoinitiators 15 are bonded to the polyimide (PI) 20.
  • FIG. 2 is a schematic diagram of the photo-alignment material applied to a liquid crystal display according to an embodiment of the present invention.
  • a method for manufacturing a liquid crystal display 1 includes: providing a photo-alignment material 10; coating the photo-alignment material on a pair of substrates 30, wherein Each of the pair of substrates 30 includes an electrode 20; the pair of substrates 30 coated with the photo-alignment material 10 are subjected to a pre-baking and a post-baking process; and the pair of substrates 30 are pre-baked and post-baked
  • ODF liquid crystal dropping filling
  • the optical alignment material 10 includes: a polyimide (PI) 20; a plurality of photopolymerizable groups (RM) 30 are bonded to the polyimide (PI) 20; and a plurality of photo
  • the pre-bake and post-bake processes can use any existing baking process and liquid crystal drop filling process (One Drop Filling). , ODF) related technology to complete.
  • the polyimide PI includes a high-reliability main chain 13 and a plurality of side chains 14 extending outward from the main chain 13.
  • the plurality of photopolymerizable groups (RM) 30 are bonded to the side chain 14 of the polyimide (PI) 20; and The plurality of photoinitiators 15 are bonded to the side chain 14 of the polyimide PI.
  • each photopolymerizable group (RM) 30 includes a rigidity bonded to the side chain 14 of the polyimide (PI) 20. Part 11 and a flexible part 12 on the rigid part 11.
  • the plurality of photopolymerizable groups are ultraviolet light polymerizable groups; preferably, the plurality of photopolymerizable groups include at least one of the following: a wavelength of 313nm The photopolymerizable group and the photopolymerizable group with a wavelength of 365nm.
  • the photoinitiator is preferably a photoinitiator with high temperature resistance.
  • the plurality of photoinitiators include at least one of the following: azo initiators, organic peroxy initiators, and inorganic peroxy initiators; preferably, the plurality of photoinitiators
  • the photoinitiator includes at least one of the following: persulfates, hydroperoxides, dioxane compounds, diacyl peroxide compounds, peroxy dicarbonate compounds, and combinations thereof, wherein the chemistry of the above compounds
  • the formula is shown in Table 1 below; more preferably, the plurality of photoinitiators include at least one of the examples listed in Table 1 below:.
  • the manufacturing method of the liquid crystal display further includes a liquid crystal pretilt process, including the following steps: using a 340nm filter to filter out light with a wavelength less than 340nm; using a wavelength greater than 340nm Irradiate the liquid crystal display with the ultraviolet light of the UV light to react the photopolymerizable group with a wavelength of 365 nm to form a predetermined topography on the surface of the polyimide (PI) 20; and apply a voltage to 313 nm The ultraviolet light is irradiated to pre-tilt the liquid crystal.
  • a liquid crystal pretilt process including the following steps: using a 340nm filter to filter out light with a wavelength less than 340nm; using a wavelength greater than 340nm Irradiate the liquid crystal display with the ultraviolet light of the UV light to react the photopolymerizable group with a wavelength of 365 nm to form a predetermined topography on the surface of the polyimide (PI) 20; and apply a voltage
  • the irradiation condition of the ultraviolet light with a wavelength greater than 340 nm is 5-20 mW/cm 2 .
  • the photo-alignment method of the present invention does not require a UV2 process.
  • the present invention provides a photo-alignment material, a method for preparing a liquid crystal display, and a photo-alignment method.
  • the photo-alignment material of the present invention by grafting a photoinitiator to a side chain, free radicals are generated under the action of light to accelerate the reaction between the photopolymerizable groups (RM) and achieve the purpose of shortening the alignment time.
  • RM photopolymerizable groups

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Liquid Crystal (AREA)

Abstract

一种光配向材料（10）、液晶显示器（1）的制备方法、及光配向方法。光配向材料（10）包括：聚酰亚胺（20）；多个光可聚合性基团（30）接合至所述聚酰亚胺（20）；以及多个光引发剂（15）接合至所述聚酰亚胺（20）。光配向材料（10），通过将光引发剂（15）接枝到侧链，在光的作用下产生自由基，以加速光可聚合性基团之间的反应，达到缩短配向时间的目的。

Description

改善光阻附着力的方法 技术领域
本发明是有关于一种光配向材料，特别是有关于一种可缩短配向时间的光配向材料及其应用。
背景技术
目前聚合物稳定的垂直排列(polymer stabilized vertical alignment,PS-VA)技术是将光可聚合性基团(reactive monomer,RM)混合在液晶中，需要长时间的UV制程去除残留的光可聚合性基团以保证显示设备的信赖性。而新PS-VA技术，将光可聚合性基团接枝到聚酰亚胺(polyimide，PI)侧链，使得光可聚合性基团为非游离态，可以在第一次紫外光照射(UV1)以完成配向后，无须再进行第二次紫外光照射(UV2)制程。但是这种新型PS-VA技术，由于光可聚合性基团固定后相互反应较为困难，造成配向过程需要的电压/UV时间较长。
技术问题
基于上述种种弊端，亟需一种可缩短配向时间的光配向材料。
技术解决方案
依据本发明的一实施例，提供一种光配向材料，包括：一聚酰亚胺(Polyimide，PI)；多个光可聚合性基团接合至所述聚酰亚胺；以及多个光引发剂接合至所述聚酰亚胺。
依据本发明的另一实施例，进一步提供一种液晶显示器的制备方法，包括：提供一种光配向材料；将所述光配向材料涂布在一对基板上，其中所述一对基板各自包括一电极；将涂布有所述光配向材料的所述一对基板进行一预烤制及一后烤制制程；以及将经预烤制及后烤制后的所述一对基板进行一液晶滴下成盒制程(One Drop Filling，ODF)，以得到所述液晶显示器，其中所述光配向材料，包括：一聚酰亚胺(Polyimide，PI)；多个光可聚合性基团接合至所述聚酰亚胺；以及多个光引发剂接合至所述聚酰亚胺。
在本发明之一实施例中，所述多个光可聚合性基团为紫外光可聚合性基团；优选地，所述多个光可聚合性基团包括下列至少一者：一波长313nm的光可聚合性基团、以及一波长365nm光可聚合性基团。
依据本发明的又一实施例，所述的液晶显示器的制备方法更包括一液晶预倾工序，包括以下步骤：利用一340nm的滤光片把波长小于340nm的光滤掉；利用一大于340nm波长的紫外光进行光照射所述液晶显示器，使所述波长365nm光可聚合性基团反应，以在所述PI表面形成一预定形貌；以及施加一电压以进行313nm的紫外光照射，使液晶预倾。
在本发明之一实施例中，所述大于340nm波长的紫 外光的照射条件为5-20mW/cm2。
在本发明之一实施例中，所述多个光可聚合性基团接合至所述聚酰亚胺之侧链；以及所述多个光引发剂接合至所述聚酰亚胺之侧链。
在本发明之一实施例中，所述多个光引发剂包括下列至少一者：偶氮类引发剂、有机过氧类引发剂、以及无机过氧类引发剂；优选地，所述多个光引发剂包括下列至少一者：过硫酸盐、氢过氧化物、过氧化二烷类化合物、过氧化二酰类化合物、过氧化二碳酸酯类化合物、及其组合。
有益效果
本发明提供一种光配向材料、液晶显示器的制备方法、及光配向方法。本发明之光配向材料，通过将光引发剂接枝到侧链，在光的作用下产生自由基，以加速RM之间的反应，达到缩短配向时间的目的。
附图说明
图1是本发明之一实施例的光配向材料的结构示意图。
图2是本发明之一实施例的光配向材料应用于液晶显示器的示意图。
本发明的最佳实施方式
在本文中提及“实施例”意味着，结合实施例描述的特定特征、结构或特性可以包含在本发明的至少一个实施例中。在说明书中的各个位置出现该短语并不一定均是指相 同的实施例，也不是与其它实施例互斥的独立的或备选的实施例。本领域技术人员显式地和隐式地理解的是，本文所描述的实施例可以与其它实施例相结合。
本发明提供一种光配向材料、液晶显示器的制备方法、及光配向方法。本发明之光配向材料，通过将光引发剂接枝到侧链，在光的作用下产生自由基，以加速光可聚合性基团(RM)之间的反应，达到缩短配向时间的目的。
据此，依据本发明的一实施例，提供一种光配向材料，包括：一聚酰亚胺(Polyimide，PI)；多个光可聚合性基团接合至所述聚酰亚胺；以及多个光引发剂接合至所述聚酰亚胺。
图1是本发明之一实施例的光配向材料的结构示意图。参见图1，具体地，依据本发明之一实施例的光配向材料10，包括：一聚酰亚胺20；多个光可聚合性基团(RM)30接合至所述聚酰亚胺(PI)20上；以及多个光引发剂15接合至所述聚酰亚胺(PI)20上。
图2是本发明之一实施例的光配向材料应用于液晶显示器的示意图。参见图2，依据本发明的另一实施例，进一步提供一种液晶显示器1的制备方法，包括：提供一种光配向材料10；将所述光配向材料涂布在一对基板30上，其中所述一对基板30各自包括一电极20；将涂布有所述光配向材料10的所述一对基板30进行一预烤制及一 后烤制制程；以及将经预烤制及后烤制后的所述一对基板30进行一液晶滴下成盒制程(One Drop Filling，ODF)，以得到所述液晶显示器1，其中所述光配向材料10，包括：一聚酰亚胺(PI)20；多个光可聚合性基团(RM)30接合至所述聚酰亚胺(PI)20；以及多个光引发剂15接合至所述聚酰亚胺(PI)20。
在上述实施例中，所述预烤制及后烤制制程、以及液晶滴下成盒制程(One Drop Filling，ODF)，可采用任何现有的烤制制程及液晶滴下成盒制程(One Drop Filling，ODF)之相关技术来完成。
参见图1，具体地，在本发明之一实施例中，所述聚酰亚胺PI包括一高信赖度的主链13，以及由主链13向外延伸的多个侧链14。
继续参见图1，具体地，在本发明之一实施例中，所述多个光可聚合性基团(RM)30接合至所述聚酰亚胺(PI)20之侧链14；以及所述多个光引发剂15接合至所述聚酰亚胺PI之侧链14。
继续参见图1，更具体地，在本发明之一实施例中，每个光可聚合性基团(RM)30包括一与所述聚酰亚胺(PI)20之侧链14接合的刚性部分11、以及一位于刚性部分11上的柔性部分12。
在本发明之一实施例中，所述多个光可聚合性基团为 紫外光可聚合性基团；优选地，所述多个光可聚合性基团包括下列至少一者：一波长313nm的光可聚合性基团、以及一波长365nm光可聚合性基团。
所述光引发剂优选为具有耐高温特性的光引发剂。在本发明之一实施例中，所述多个光引发剂包括下列至少一者：偶氮类引发剂、有机过氧类引发剂、以及无机过氧类引发剂；优选地，所述多个光引发剂包括下列至少一者：过硫酸盐、氢过氧化物、过氧化二烷类化合物、过氧化二酰类化合物、过氧化二碳酸酯类化合物、及其组合，其中上述化合物的化学通式如下表一所示；更优选地，所述多个光引发剂包括下列表一所列例子中的至少一者：。
表一
Figure PCTCN2019083613-appb-000001
Figure PCTCN2019083613-appb-000002
依据本发明的又一实施例，所述的液晶显示器的制备方法更包括一液晶预倾工序，包括以下步骤：利用一340nm的滤光片把波长小于340nm的光滤掉；利用一大于340nm波长的紫外光进行光照射所述液晶显示器，使所述波长365nm光可聚合性基团反应，以在所述聚酰亚胺(PI)20表面形成一预定形貌；以及施加一电压以进行313nm的紫外光照射，使液晶预倾。
在本发明之液晶显示器的光配向方法的一具体实施例中，所述大于340nm波长的紫外光的照射条件为5-20mW/cm 2。本发明的光配向方法不须UV2制程。
综上所述，本发明提供一种光配向材料、液晶显示器的制备方法、及光配向方法。本发明之光配向材料，通过将光引发剂接枝到侧链，在光的作用下产生自由基，以加速光可聚合性基团(RM)之间的反应，达到缩短配向时间的目的。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 (14)

  1. 一种光配向材料，包括：
    一聚酰亚胺(Polyimide，PI)；
    多个光可聚合性基团接合至所述聚酰亚胺；以及多个光引发剂接合至所述聚酰亚胺，
    其中所述多个光可聚合性基团接合至所述聚酰亚胺之侧链；以及所述多个光引发剂接合至所述聚酰亚胺之侧链，且所述多个光可聚合性基团为紫外光可聚合性基团。
  2. 根据权利要求1所述的光配向材料，其中所述多个光可聚合性基团包括下列至少一者：一波长313nm的光可聚合性基团、以及一波长365nm光可聚合性基团。
  3. 根据权利要求1所述的光配向材料，其中所述多个光引发剂包括下列至少一者：偶氮类引发剂、有机过氧类引发剂、以及无机过氧类引发剂。
  4. 根据权利要求1所述的光配向材料，其中所述多个光引发剂包括下列至少一者：过硫酸盐、氢过氧化物、过氧化二烷类化合物、过氧化二酰类化合物、过氧化二碳酸酯类化合物、及其组合。
  5. 一种光配向材料，包括：
    一聚酰亚胺(Polyimide，PI)；
    多个光可聚合性基团接合至所述聚酰亚胺；以及
    多个光引发剂接合至所述聚酰亚胺。
  6. 根据权利要求5所述的光配向材料，其中所述多个光可聚合性基团接合至所述聚酰亚胺之侧链；以及所述多个光引发剂接合至所述聚酰亚胺之侧链。
  7. 根据权利要求5所述的光配向材料，中所述多个光可聚合性基团为紫外光可聚合性基团。
  8. 根据权利要求7所述的光配向材料，其中所述多个光可聚合性基团包括下列至少一者：一波长313nm的光可聚合性基团、以及一波长365nm光可聚合性基团。
  9. 根据权利要求5所述的光配向材料，其中所述多个光引发剂包括下列至少一者：偶氮类引发剂、有机过氧类引发剂、以及无机过氧类引发剂。
  10. 根据权利要求5所述的光配向材料，其中所述多个光引发剂包括下列至少一者：过硫酸盐、氢过氧化物、过氧化二烷类化合物、过氧化二酰类化合物、过氧化二碳酸酯类化合物、及其组合。
  11. 一种液晶显示器的制备方法，包括：
    提供一种光配向材料；
    将所述光配向材料涂布在一对基板上，其中所述一对基板各自包括一电极；
    将涂布有所述光配向材料的所述一对基板进行一预烤制及一后烤制制程；以及
    将经预烤制及后烤制后的所述一对基板进行一液晶 滴下成盒制程(One Drop Filling，ODF)，以得到所述液晶显示器，
    其中所述光配向材料，包括：
    一聚酰亚胺(Polyimide，PI)；
    多个光可聚合性基团接合至所述聚酰亚胺；以及
    多个光引发剂接合至所述聚酰亚胺。
  12. 根据权利要求11所述的液晶显示器的制备方法，其中所述多个光可聚合性基团包括光可聚合性基团；以及所述多个光引发剂包括下列至少一者：偶氮类引发剂、有机过氧类引发剂、以及无机过氧类引发剂。
  13. 根据权利要求11所述的液晶显示器的制备方法，更包括一液晶预倾工序，其中所述多个光可聚合性基团包括一波长313nm的光可聚合性基团以及一波长365nm光可聚合性基团，所述液晶预倾工序包括以下步骤：
    利用一340nm的滤光片把波长小于340nm的光滤掉；
    利用一大于340nm波长的紫外光进行光照射所述液晶显示器，使所述波长365nm光可聚合性基团反应，以在所述PI表面形成一预定形貌；以及
    施加一电压以进行313nm的紫外光照射，使液晶预倾。
  14. 根据权利要求13所述的液晶显示器的制备方法，其中所述大于340nm波长的紫外光的照射条件为 5-20mW/cm 2。
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