TWI480635B - Cholesteric liquid crystal display and method for fabricating thereof - Google Patents
Cholesteric liquid crystal display and method for fabricating thereof Download PDFInfo
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本揭露係有關於膽固醇液晶顯示裝置，且特別是有關於一種具有電致變色特性以及電壓改變反射率之特性的膽固醇液晶顯示裝置。The present disclosure relates to a cholesteric liquid crystal display device, and more particularly to a cholesteric liquid crystal display device having characteristics of electrochromic properties and voltage-changing reflectance.
膽固醇液晶顯示裝置係為反射式顯示，不需背光源，且可使用塑膠基板取代傳統的玻璃基板，因而可製作於軟性基板上，符合輕薄、可撓等軟性顯示器之應用需求。同時，膽固液的液晶顯示介質具有記憶特性，於顯示靜態畫面時不需耗電，即只有在更新顯示畫面畫面時才需耗電，相較於傳統液晶顯示器，其耗電量大為降低。目前，軟性電子紙在彩色化技術上，如何將畫質進一步提昇，以提高彩色電子紙之反射率及對比，係為彩色化技術之關鍵。The cholesteric liquid crystal display device is a reflective display, does not require a backlight, and can replace a conventional glass substrate with a plastic substrate, so that it can be fabricated on a flexible substrate to meet the application requirements of a flexible display such as a thin and flexible. At the same time, the liquid crystal display medium of the bile liquid has a memory characteristic, and does not need to consume electricity when displaying a static picture, that is, only when the display screen image is updated, power consumption is required, and the power consumption is greatly reduced compared with the conventional liquid crystal display. . At present, in the colorization technology of soft electronic paper, how to improve the image quality to improve the reflectivity and contrast of color electronic paper is the key to colorization technology.
膽固醇液晶顯示裝置係具有雙穩態，因為其中的膽固醇液晶具有特定的螺距，當其螺距與入射光波長相近時，可以選擇性地反射特定波長中的特定旋光。傳統膽固醇液晶顯示裝置可由高/低電壓脈衝反覆切換亮態/暗態，例如在亮態的平面狀態(planar)及暗態的焦點圓錐狀態(focal conic)反覆切換。因此，可藉由控制膽固醇液晶的轉態來控制膽固醇液晶顯示裝置之反射率。The cholesteric liquid crystal display device has a bistable state because the cholesteric liquid crystal therein has a specific pitch, and when its pitch is close to the wavelength of the incident light, it can selectively reflect a specific optical rotation in a specific wavelength. The conventional cholesteric liquid crystal display device can repeatedly switch between a bright state/a dark state by a high/low voltage pulse, for example, a planar state in a bright state and a focal conic state in a dark state. Therefore, the reflectance of the cholesteric liquid crystal display device can be controlled by controlling the transition state of the cholesteric liquid crystal.
電致變色(electrically tunable color)技術為膽固醇顯示裝置顯示彩色之一種技術。在電致變色(electrically tunable color)技術中，膽固醇液晶係因受聚合物的限制而固定於平 面狀態，會依照施予的電壓不同而使膽固醇液晶之螺距(pitch)改變，造成反射出不同顏色。An electrically tunable color technique is a technique for displaying color in a cholesterol display device. In the electrically tunable color technology, the cholesteric liquid crystal is fixed to the flat by the polymer. In the surface state, the pitch of the cholesteric liquid crystal changes depending on the applied voltage, causing different colors to be reflected.
本揭露實施例係提供一種膽固醇液晶顯示裝置，包括：一第一基板；一第二基板；以及一膽固醇液晶層，夾設於此第一基板及此第二基板之間，此膽固醇液晶層係包含一聚合物及一膽固醇液晶，其中此聚合物部分限制此膽固醇液晶對應於電壓的轉態，以使此膽固醇液晶層具有一第一部分及一第二部分，其中此第一部分鄰近此第一基板並具有電致變色特性，此第二部分鄰近此第二基板並具有隨電壓改變反射率之特性。The present disclosure provides a cholesteric liquid crystal display device comprising: a first substrate; a second substrate; and a cholesteric liquid crystal layer interposed between the first substrate and the second substrate, the cholesteric liquid crystal layer A polymer and a cholesteric liquid crystal, wherein the polymer partially restricts the transition of the cholesteric liquid crystal to a voltage such that the cholesteric liquid crystal layer has a first portion and a second portion, wherein the first portion is adjacent to the first substrate And having electrochromic properties, the second portion is adjacent to the second substrate and has a characteristic of changing reflectance with voltage.
本揭露實施例亦提供一種膽固醇液晶顯示裝置之製造方法，包括：加入一膽固醇液晶層於第一基板及第二基板中，其中此膽固醇液晶層包含一膽固醇液晶、複數單體及一起始劑；以及自此第一基板側施加能量，以使這些單體聚合形成聚合物，其中此聚合物部分限制此膽固醇液晶對應於電壓的轉態，並使此膽固醇液晶層具有一第一部分及一第二部分，此第一部分鄰近此第一基板並具有電致變色特性，此第二部分鄰近此第二基板並具有隨電壓改變反射率之特性。The present disclosure also provides a method for manufacturing a cholesteric liquid crystal display device, comprising: adding a cholesteric liquid crystal layer in a first substrate and a second substrate, wherein the cholesteric liquid crystal layer comprises a cholesteric liquid crystal, a plurality of monomers, and a starter; And applying energy from the first substrate side to polymerize the monomers to form a polymer, wherein the polymer partially restricts the transition of the cholesteric liquid crystal to a voltage, and the cholesteric liquid crystal layer has a first portion and a second In part, the first portion is adjacent to the first substrate and has electrochromic characteristics, and the second portion is adjacent to the second substrate and has a characteristic of changing reflectance with voltage.
為讓本揭露之上述和其他目的、特徵、和優點能更明顯易懂，下文特舉出較佳實施例，並配合所附圖式，作詳細說明如下：The above and other objects, features and advantages of the present invention will become more apparent and understood.
下述揭露內容提供多種實施例，以實現本揭露的多種不同特徵。在本說明書中，為了簡化說明，將採用特定的實施例、單元、及組合方式說明。然而這些特例僅用以說明而非限制本揭露。此外，為求圖示簡潔清楚，各元件可能以任意比例繪示。The following disclosure provides various embodiments to implement various features of the present disclosure. In the present specification, in order to simplify the description, specific embodiments, units, and combinations will be described. However, these specific examples are only intended to illustrate and not to limit the disclosure. In addition, elements may be drawn at any scale for simplicity and clarity of illustration.
本揭露實施例係提供一種雙模式膽固醇液晶顯示裝置，其係同時具有隨電壓改變反射率及電致變色的顯示效果，以在具有電致變色的顯示效果時，可提高膽固醇液晶顯示裝置之反射率。The disclosed embodiments provide a dual-mode cholesteric liquid crystal display device having a display effect of changing reflectance and electrochromism with voltage, so as to improve reflection of a cholesteric liquid crystal display device when having an electrochromic display effect. rate.
第1A~1D圖係顯示為依照本揭露一實施例之膽固醇液晶顯示裝置100之製造方法於各中間製程階段之剖面圖。參見第1A圖，首先提供一第一基板102及一第二基板104。在一實施例中，第一基板102及第二基板104可為一透明或半透明之塑膠基板、玻璃基板或任意之可撓基板。在該第一基板102及該第二基板104之間，可具有一間隔物(未顯示)，以使第一基板102及第二基板104之間具有一間隙(cell gap)，供膽固醇液晶層注入。在一可選擇之實施例中，第一基板102及第二基板104上更可包含配向層(未顯示)，配向層可使膽固醇液晶之螺旋軸垂直於第一基板及第二基板。1A to 1D are cross-sectional views showing the manufacturing method of the cholesteric liquid crystal display device 100 according to an embodiment of the present invention at each intermediate process stage. Referring to FIG. 1A, a first substrate 102 and a second substrate 104 are first provided. In one embodiment, the first substrate 102 and the second substrate 104 can be a transparent or translucent plastic substrate, a glass substrate, or any flexible substrate. Between the first substrate 102 and the second substrate 104, a spacer (not shown) may be disposed to have a cell gap between the first substrate 102 and the second substrate 104 for the cholesteric liquid crystal layer. injection. In an alternative embodiment, the first substrate 102 and the second substrate 104 further comprise an alignment layer (not shown), and the alignment layer can make the spiral axis of the cholesteric liquid crystal perpendicular to the first substrate and the second substrate.
接著，參見第1B圖，注入一膽固醇液晶層108至第一基板102及第二基板104之間的間隙中。此膽固醇液晶層可至少包含膽固醇液晶、複數個單體及起始劑(以下係以光起始劑為例)。在一些實施例中，膽固醇液晶層中之膽固醇 液晶、單體及起始劑之重量比可例如約為100：5~15：0.1~5。在一實施例中，此膽固醇液晶可包含向列型液晶，並混摻手性摻雜劑。向列型液晶可例如包含E44(Merck)、E7(Merck)等。手性摻雜劑可例如包含螺旋扭轉力(helical twisting power，HTP)大約10~40 μm-1 之材料，例如可使用商品R1011(Merck)、S1011(Merck)、R811(Merck)、S811(Merck)等。在某些實施例中，更可視需求使用兩種以上之手性摻雜劑之組合，以具有高HTP並能合適的溶於膽固醇液晶層。例如，在本實施例中，可使用HTP值為約10~15 μm-1 之間的手性摻雜劑(例如R811)混摻HTP值為約30~40 μm-1 之間的手性摻雜劑(例如R1011)，其重量比可為約3：1~6：1。因此，手性摻雜劑在膽固醇液晶中可小於或等於30 wt%，或甚至小於或等於20 wt%，且可具有足夠的HTP以達到改變向列型液晶之螺距之效果。Next, referring to FIG. 1B, a cholesteric liquid crystal layer 108 is implanted into the gap between the first substrate 102 and the second substrate 104. The cholesteric liquid crystal layer may contain at least a cholesteric liquid crystal, a plurality of monomers, and an initiator (hereinafter, a photoinitiator is exemplified). In some embodiments, the weight ratio of the cholesteric liquid crystal, the monomer, and the initiator in the cholesteric liquid crystal layer may be, for example, about 100:5 to 15:0.1 to 5. In one embodiment, the cholesteric liquid crystal may comprise a nematic liquid crystal and incorporate a chiral dopant. The nematic liquid crystal may include, for example, E44 (Merck), E7 (Merck), or the like. The chiral dopant may, for example, comprise a material having a helical twisting power (HTP) of about 10 to 40 μm -1 , for example, commercially available products R1011 (Merck), S1011 (Merck), R811 (Merck), and S811 (Merck). )Wait. In certain embodiments, it may be more desirable to use a combination of two or more chiral dopants to have a high HTP and to be suitably soluble in the cholesteric liquid crystal layer. For example, in the present embodiment, a chiral dopant having a HTP value of about 10 to 15 μm -1 (for example, R811) may be used, and a chiral dopant having a HTP value of about 30 to 40 μm -1 may be blended. The dopant (for example, R1011) may have a weight ratio of about 3:1 to 6:1. Thus, the chiral dopant can be less than or equal to 30 wt%, or even less than or equal to 20 wt% in the cholesteric liquid crystal, and can have sufficient HTP to achieve the effect of changing the pitch of the nematic liquid crystal.
膽固醇液晶層中之單體可包含具壓克力官能基之單體，例如商品RM257(Merck)、RM691(Merck)、RM23(Merck)等。在某些實施例中，可視需求使用兩種以上之單體，其可具有不同的聚合速率及擴散速率，以在聚合時得到不同的聚合效果。例如，在一實施例中，分子量較大的單體與分子量較少的單體之比例可為約1：1~2：1。在一實施例中，光起始劑可包含安息香甲基醚(benzoin methyl ether)、安息香乙基醚(benzoin ethyl ether)、或使用商品Irgacure 651(Ciba)等。接著，參見第1C圖，僅自該第一基板102側對膽固醇液晶層108施加能量(以下舉照射UV 光為例)，以使膽固醇液晶層108中之單體聚合形成聚合物，形成如第1D圖所示之膽固醇液晶顯示裝置。在一實施例中，聚合物中可具有交聯而具有剛性，因而可限制膽固醇液晶對應於電壓的轉態。此外，由於UV僅自第一基板102側照射，可於膽固醇液晶層108中形成一第一部分108a及一第二部分108b，其中第一部分108a鄰近於第一基板102側，第二部分108b鄰近於第二基板104側。在本實施例中，膽固醇液晶層108之第一部分108a係會受到較多的照光，其中之單體之聚合程度係會大於膽固醇液晶層108之第二部分108b中之單體之聚合程度。也就是說，膽固醇液晶層108之第一部分108a中之聚合物相對於第二部分108b中之聚合物係具有較大的重量平均分子量及較多的交聯。因此，膽固醇液晶層108之第一部分108a中之膽固醇液晶對應於電壓的轉態，相對於第二部分108b，其受聚合物剛性限制的影響較大。亦即，膽固醇液晶層108之第二部分108b之膽固醇液晶相較於第一部分108a仍可自由轉態。The monomer in the cholesteric liquid crystal layer may comprise a monomer having an acryl functional group, such as commercially available RM257 (Merck), RM691 (Merck), RM23 (Merck), and the like. In certain embodiments, more than two monomers may be used as desired, which may have different polymerization rates and diffusion rates to achieve different polymerization effects upon polymerization. For example, in one embodiment, the ratio of the larger molecular weight monomer to the less molecular weight monomer may range from about 1:1 to 2:1. In one embodiment, the photoinitiator may comprise benzoin methyl ether, benzoin ethyl ether, or the commercial Irgacure 651 (Ciba) or the like. Next, referring to FIG. 1C, energy is applied to the cholesteric liquid crystal layer 108 only from the side of the first substrate 102 (hereinafter, UV irradiation) For example, light is used to polymerize a monomer in the cholesteric liquid crystal layer 108 to form a polymer, thereby forming a cholesteric liquid crystal display device as shown in Fig. 1D. In one embodiment, the polymer may have crosslinks and be rigid, thereby limiting the transition of the cholesteric liquid crystal to voltage. In addition, since the UV is irradiated only from the side of the first substrate 102, a first portion 108a and a second portion 108b may be formed in the cholesteric liquid crystal layer 108, wherein the first portion 108a is adjacent to the first substrate 102 side, and the second portion 108b is adjacent to The second substrate 104 side. In this embodiment, the first portion 108a of the cholesteric liquid crystal layer 108 is subjected to more illumination, wherein the degree of polymerization of the monomer is greater than the degree of polymerization of the monomer in the second portion 108b of the cholesteric liquid crystal layer 108. That is, the polymer in the first portion 108a of the cholesteric liquid crystal layer 108 has a greater weight average molecular weight and more cross-linking than the polymer system in the second portion 108b. Therefore, the cholesteric liquid crystal in the first portion 108a of the cholesteric liquid crystal layer 108 corresponds to the transition state of the voltage, which is greatly affected by the polymer rigidity limitation with respect to the second portion 108b. That is, the cholesteric liquid crystal of the second portion 108b of the cholesteric liquid crystal layer 108 is still freely translatable compared to the first portion 108a.
在一實施例中，此照射UV光之步驟可包含以約0.1~2mW之功率，照射約15~30min。值得注意的是，在此照射UV光之步驟中，應需注意避免第二部分108b中之膽固醇液晶的轉態，因過度受限於聚合物的剛性而喪失隨電壓改變反射率的顯示效果，然而，照光之時間及功率仍可視使用的儀器設備調整，不以此為限。在某些實施例中，更可在對膽固醇液晶層照射UV光之前，先加熱膽固醇液 晶層，使膽固醇液晶層呈澄清狀，利於平面狀態(planar)的配向，有助於反射率的提升。In one embodiment, the step of illuminating the UV light may comprise illuminating for about 15 to 30 minutes at a power of about 0.1 to 2 mW. It should be noted that in the step of irradiating UV light, care should be taken to avoid the transition state of the cholesteric liquid crystal in the second portion 108b, and the display effect of changing the reflectance with voltage is lost due to excessive limitation of the rigidity of the polymer. However, the time and power of the illumination can still be adjusted according to the instrument and equipment used, and is not limited to this. In some embodiments, the cholesterol liquid is heated before the luminosity liquid crystal layer is irradiated with UV light. The crystal layer makes the cholesteric liquid crystal layer clear, which is favorable for the planar alignment and contributes to the improvement of the reflectance.
膽固醇液晶層108之第一部分108a中的膽固醇液晶係會因聚合物剛性的限制而固定於平面狀態，限制膽固醇液晶的轉態，而膽固醇液晶之螺距仍能隨電壓改變，而具有電致變色的顯示效果，例如依照施予的電壓不同反射不同顏色的波長。此外，膽固醇液晶層108之第二部分108b仍保持膽固醇液晶顯示裝置的隨電壓改變反射率的顯示效果。在一實施例中，膽固醇液晶層108之第二部分108b在被施予電壓時，膽固醇液晶可例如由亮態的平面狀態(planar)轉變為暗態的焦點圓錐狀態(focal conic)，其反射率可為未被施予電壓時的約20~40倍。在一實施例中，膽固醇液晶層108之第一部分108a在未被施予電壓時，可具有約600 nm~800 nm之反射波長，且膽固醇液晶層之第一部分在被施予電壓時，可具有藍位移。例如施予電壓為50~70V時，膽固醇液晶層之第一部分之反射波長可具有約100 nm之藍位移。在某些實施例中，膽固醇液晶層之第二部分在被施予電壓時的反射率可為未被施予電壓時的約20~50倍，或30~50倍，且實質上不具有電致變色之特性。在一實施例中，該膽固醇液晶層之厚度係為3~20 μm。The cholesteric liquid crystal in the first portion 108a of the cholesteric liquid crystal layer 108 is fixed in a planar state due to the limitation of polymer rigidity, restricting the transition state of the cholesteric liquid crystal, and the pitch of the cholesteric liquid crystal can still change with voltage, and has electrochromic The display effect, for example, reflects the wavelengths of different colors depending on the applied voltage. Further, the second portion 108b of the cholesteric liquid crystal layer 108 maintains the display effect of the voltage change reflectance of the cholesteric liquid crystal display device. In one embodiment, when the second portion 108b of the cholesteric liquid crystal layer 108 is applied with a voltage, the cholesteric liquid crystal may be converted from a planar state of a bright state to a focal conic of a dark state, which is reflected. The rate can be about 20 to 40 times that when the voltage is not applied. In an embodiment, the first portion 108a of the cholesteric liquid crystal layer 108 may have a reflection wavelength of about 600 nm to 800 nm when no voltage is applied, and the first portion of the cholesteric liquid crystal layer may have a voltage when applied. Blue displacement. For example, when the application voltage is 50 to 70 V, the reflection wavelength of the first portion of the cholesteric liquid crystal layer may have a blue shift of about 100 nm. In some embodiments, the second portion of the cholesteric liquid crystal layer may have a reflectance of about 20 to 50 times, or 30 to 50 times, when the voltage is applied, and has substantially no electricity. The property of discoloration. In one embodiment, the cholesteric liquid crystal layer has a thickness of 3 to 20 μm.
值得注意的是，膽固醇液晶層108之第一部分108a及第二部分108b中的單體均會進行聚合，第一部分108a及第二部分108b之單體均會進行聚合，在實際操作中可能不易觀察到第一部分108a及第二部分108b的明顯分層。然 而，在通入電壓後，可自膽固醇液晶顯示裝置之第一基板102側可觀察到明顯的變色，且自第二基板側104可觀察到觀側到明顯的亮度增加。It should be noted that the monomers in the first portion 108a and the second portion 108b of the cholesteric liquid crystal layer 108 are all polymerized, and the monomers of the first portion 108a and the second portion 108b are polymerized, which may be difficult to observe in actual operation. Significant stratification to the first portion 108a and the second portion 108b. Of course However, after the voltage is applied, significant discoloration can be observed from the side of the first substrate 102 of the cholesteric liquid crystal display device, and a significant increase in brightness from the side of the second substrate side 104 can be observed.
將93.2 wt%之膽固醇液晶、6 wt%之聚合物單體及0.8 wt%之光起始劑均勻混合並加入至具有配向層之光電單元(electro-optical cell)的間隙內，形成膽固醇液晶層。膽固醇液晶由83 wt%之向列型液晶(E44，Merck)及17 wt%之手性摻雜劑(3 wt%之R1011及14 wt%之R811)組成。聚合物單體由66.7 wt%之RM257(Merck)及33.3 wt%之RM23(Merck)組成。光起始劑為安息香甲基醚。光電單元(electro-optical cell)具有5.6 μm之間隙。接著自光電單元的一側對膽固醇液晶層照射UV光(365 nm、0.5mW/cm2 )20分鐘，使膽固醇液晶層中的單體進行聚合。93.2 wt% of cholesteric liquid crystal, 6 wt% of polymer monomer and 0.8 wt% of photoinitiator are uniformly mixed and added to a gap of an electro-optical cell having an alignment layer to form a cholesteric liquid crystal layer . Cholesterol liquid crystals consisted of 83 wt% nematic liquid crystal (E44, Merck) and 17 wt% chiral dopant (3 wt% R1011 and 14 wt% R811). The polymer monomer consisted of 66.7 wt% of RM257 (Merck) and 33.3 wt% of RM23 (Merck). The photoinitiator is benzoin methyl ether. The electro-optical cell has a gap of 5.6 μm. Next, the cholesteric liquid crystal layer was irradiated with UV light (365 nm, 0.5 mW/cm 2 ) for 20 minutes from one side of the photovoltaic unit to polymerize the monomer in the cholesteric liquid crystal layer.
將90 wt%之膽固醇液晶、9 wt%之聚合物單體及1 wt%之光起始劑均勻混合並加入至具有配向層之光電單元(electro-optical cell)的間隙內，形成膽固醇液晶層。膽固醇液晶由81 wt%之向列型液晶(E44，Merck)及19 wt%之手性摻雜劑(3 wt%之R1011及16wt%之R811)組成。聚合物單體由66.7%之RM691(Merck)及33.3%之RM257(Merck)組成。光起始劑為安息香甲基醚。光電單元(electro-optical cell)具有5.6 μm之間隙。接著自光電單元的一側對膽固醇液晶層照射UV光(365 nm、0.5 mW/cm2 )20分鐘，使膽固 醇液晶層中的單體進行聚合。90 wt% of cholesteric liquid crystal, 9 wt% of polymer monomer and 1 wt% of photoinitiator are uniformly mixed and added to a gap of an electro-optical cell having an alignment layer to form a cholesteric liquid crystal layer . The cholesteric liquid crystal is composed of 81 wt% of nematic liquid crystal (E44, Merck) and 19 wt% of a chiral dopant (3 wt% of R1011 and 16 wt% of R811). The polymer monomer consisted of 66.7% of RM691 (Merck) and 33.3% of RM257 (Merck). The photoinitiator is benzoin methyl ether. The electro-optical cell has a gap of 5.6 μm. Next, the cholesteric liquid crystal layer was irradiated with UV light (365 nm, 0.5 mW/cm 2 ) for 20 minutes from one side of the photovoltaic unit to polymerize the monomer in the cholesteric liquid crystal layer.
將94.95 wt%之膽固醇液晶、5 wt%之聚合物單體及0.05 wt%之光起始劑均勻混合並加入至具有配向層之光電單元(electro-optical cell)的間隙內，形成膽固醇液晶層。膽固醇液晶由67.3 wt%之向列型液晶(E44，Merck)及32.7 wt%之手性摻雜劑(CB15，Merck)組成。聚合物單體為RM257(Merck)，光起始劑為Irgacure 651(Merck)。光電單元(electro-optical cell)具有10 μm之間隙。接著，自光電單元的一側對膽固醇液晶層照射UV光(365 nm、0.4 mW/cm2 )30分鐘，使膽固醇液晶層中的單體進行聚合。94.95 wt% of cholesteric liquid crystal, 5 wt% of polymer monomer and 0.05 wt% of photoinitiator are uniformly mixed and added to a gap of an electro-optical cell having an alignment layer to form a cholesteric liquid crystal layer . Cholesterol liquid crystals consisted of 67.3 wt% nematic liquid crystal (E44, Merck) and 32.7 wt% chiral dopant (CB15, Merck). The polymer monomer was RM257 (Merck) and the photoinitiator was Irgacure 651 (Merck). The electro-optical cell has a gap of 10 μm. Next, the cholesteric liquid crystal layer was irradiated with UV light (365 nm, 0.4 mW/cm 2 ) for 30 minutes from one side of the photovoltaic cell to polymerize the monomer in the cholesteric liquid crystal layer.
將94.95 wt%之膽固醇液晶、5 wt%之聚合物單體及0.05 wt%之光起始劑均勻混合並加入至具有配向層之光電單元(electro-optical cell)的間隙內，形成膽固醇液晶層。膽固醇液晶由67.3 wt%之向列型液晶(E44，Merck)及32.7%之手性摻雜劑(CB15，Merck)組成。聚合物單體為RM257(Merck)，光起始劑為Irgacure 651(Merck)。光電單元(electro-optical cell)具有5.7 μm之間隙。接著，自光電單元的一側對膽固醇液晶層照射UV光(365 nm、0.4 mW/cm2 )30分鐘，使膽固醇液晶層中的單體進行聚合。94.95 wt% of cholesteric liquid crystal, 5 wt% of polymer monomer and 0.05 wt% of photoinitiator are uniformly mixed and added to a gap of an electro-optical cell having an alignment layer to form a cholesteric liquid crystal layer . Cholesterol liquid crystals consisted of 67.3 wt% nematic liquid crystal (E44, Merck) and 32.7% chiral dopant (CB15, Merck). The polymer monomer was RM257 (Merck) and the photoinitiator was Irgacure 651 (Merck). The electro-optical cell has a gap of 5.7 μm. Next, the cholesteric liquid crystal layer was irradiated with UV light (365 nm, 0.4 mW/cm 2 ) for 30 minutes from one side of the photovoltaic cell to polymerize the monomer in the cholesteric liquid crystal layer.
附件1顯示為實施例2之膽固醇液晶顯示裝置之兩側在施予不同電壓時的照片，其中右側圖示顯示為由照射UV光之一側觀之，左圖顯示為由未照射UV光之一側觀之。 如右圖所示，當電壓增加時，可觀測到照射UV光之一側之顏色由橘紅色逐漸轉變為接近藍色。此外，如右圖所示，當電壓增加時，可觀測到未照射UV光之一側之亮度亦逐漸提高。Annex 1 shows a photograph of the two sides of the cholesteric liquid crystal display device of Example 2 when different voltages are applied, wherein the right side view is shown as being viewed from one side of the illuminating UV light, and the left image is shown as being unirradiated by UV light. Look at one side. As shown in the right figure, when the voltage is increased, it can be observed that the color of one side of the irradiated UV light gradually changes from orange to near blue. Further, as shown in the right figure, when the voltage is increased, the brightness on the side of the unirradiated UV light is gradually increased.
第2A至2D圖係各自顯示實施例1~2及比較例1~2之膽固醇液晶顯示裝置在不同電壓下，自照射UV光之一側量測得到之反射波長及反射率。第3A至3D圖係各自顯示實施例1~2及比較例1~2之膽固醇液晶顯示裝置在不同電壓下，自未照射UV光之一側量測得到之之反射波長及反射率。如第2A至第2B圖所示，在施加電壓增加時，膽固醇液晶層之反射波長向均會具有藍位移。在施加電壓約50V時，具有藍位移約100 nm。此外，參見第3A及3B圖，在施加電壓增加時，膽固醇液晶層之反射率亦會隨之增加，但不具有波長的位移。也就是說，在施加電壓時，膽固醇液晶層之相對靠近照光側的部分係會具有電致變色特性，而膽固醇液晶層之相對遠離照光側的部分係不具有電致變色特性，但具有隨電壓改變反射率之特性。膽固醇液晶層之相對遠離照光側的部分在施加電壓時與未施加電壓時相較，對比最高可達35(即反射率為35倍)。參見第2C及2D圖，在施加電壓增加時，膽固醇液晶層之反射波長向係同樣具有藍位移。然而，參見第3C及3D圖，無論增加施予電壓或增加液晶層厚度，比較例1、2之膽固醇液晶層之反射率均無明顯提升(對比不大於2)。因此，在比較例1、2中之膽固醇液晶層顯然不具有隨電壓改變反射率特性。2A to 2D are graphs showing the reflection wavelength and reflectance of the cholesteric liquid crystal display devices of Examples 1 to 2 and Comparative Examples 1 and 2 measured from one side of the irradiated UV light at different voltages. 3A to 3D are graphs showing the reflection wavelength and reflectance of the cholesteric liquid crystal display devices of Examples 1 and 2 and Comparative Examples 1 and 2 measured from one side of the non-irradiated UV light at different voltages. As shown in FIGS. 2A to 2B, when the applied voltage is increased, the reflection wavelength of the cholesteric liquid crystal layer has a blue shift. When the applied voltage is about 50 V, it has a blue shift of about 100 nm. In addition, referring to Figures 3A and 3B, as the applied voltage increases, the reflectivity of the cholesteric liquid crystal layer also increases, but does not have a wavelength shift. That is to say, when a voltage is applied, a portion of the cholesteric liquid crystal layer relatively close to the illuminating side may have electrochromic properties, and a portion of the cholesteric liquid crystal layer that is relatively far from the illuminating side has no electrochromic property, but has a voltage with Change the characteristics of the reflectivity. The portion of the cholesteric liquid crystal layer that is relatively far from the illuminating side is comparable to 35 when the voltage is applied, and the contrast is up to 35 (i.e., the reflectance is 35 times). Referring to Figures 2C and 2D, the reflected wavelength of the cholesteric liquid crystal layer also has a blue shift as the applied voltage increases. However, referring to Figures 3C and 3D, the reflectance of the cholesteric liquid crystal layer of Comparative Examples 1 and 2 was not significantly improved (compared to not more than 2) regardless of the application of the voltage or the increase of the thickness of the liquid crystal layer. Therefore, the cholesteric liquid crystal layer in Comparative Examples 1 and 2 apparently did not have a reflectance characteristic with voltage.
由上述可知，本揭露係提供了同時具有電致變色及隨電壓改變反射率之雙模式膽固醇顯示裝置，提供彩色反射式膽固醇顯示裝置之一種新的發展方向。As can be seen from the above, the present disclosure provides a dual-mode cholesterol display device having both electrochromic and voltage-dependent reflectance, and provides a new development direction of the color reflective cholesterol display device.
雖然本揭露已以數個較佳實施例揭露如上，然其並非用以限定本揭露，任何所屬技術領域中具有通常知識者，在不脫離本揭露之精神和範圍內，當可作任意之更動與潤飾，因此本揭露之保護範圍當視後附之申請專利範圍所界定者為準。The present disclosure has been disclosed in the above-described preferred embodiments, and is not intended to limit the disclosure. Any one of ordinary skill in the art can make any changes without departing from the spirit and scope of the disclosure. And the scope of protection of this disclosure is subject to the definition of the scope of the patent application.
100‧‧‧膽固醇液晶顯示裝置100‧‧‧Cholesterol liquid crystal display device
102‧‧‧第一基板102‧‧‧First substrate
104‧‧‧第二基板104‧‧‧second substrate
108‧‧‧膽固醇液晶層108‧‧‧Cholesterol liquid crystal layer
108a‧‧‧第一部分108a‧‧‧Part I
108b‧‧‧第二部分108b‧‧‧Part II
第1A~1D圖係顯示為依照本揭露一實施例之膽固醇液晶顯示裝置100之製造方法於各中間製程階段之剖面圖。1A to 1D are cross-sectional views showing the manufacturing method of the cholesteric liquid crystal display device 100 according to an embodiment of the present invention at each intermediate process stage.
第2A至2D圖各自顯示實施例1~2及比較例1~2之膽固醇液晶顯示裝置在不同電壓下，自照射UV光之一側量測得到之反射波長及反射率。2A to 2D each show the reflection wavelength and reflectance of the cholesteric liquid crystal display devices of Examples 1 to 2 and Comparative Examples 1 and 2 measured from one side of the irradiated UV light at different voltages.
第3A至3D圖係各自顯示實施例1~2及比較例1~2之膽固醇液晶顯示裝置在不同電壓下，自未照射UV光之一側量測得到之之反射波長及反射率。3A to 3D are graphs showing the reflection wavelength and reflectance of the cholesteric liquid crystal display devices of Examples 1 and 2 and Comparative Examples 1 and 2 measured from one side of the non-irradiated UV light at different voltages.
100‧‧‧膽固醇液晶顯示裝置100‧‧‧Cholesterol liquid crystal display device
102‧‧‧第一基板102‧‧‧First substrate
104‧‧‧第二基板104‧‧‧second substrate
108‧‧‧膽固醇液晶層108‧‧‧Cholesterol liquid crystal layer
108a‧‧‧第一部分108a‧‧‧Part I
108b‧‧‧第二部分108b‧‧‧Part II
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