CN100530520C - 场发射背光装置 - Google Patents

场发射背光装置 Download PDF

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CN100530520C
CN100530520C CNB2005100062352A CN200510006235A CN100530520C CN 100530520 C CN100530520 C CN 100530520C CN B2005100062352 A CNB2005100062352 A CN B2005100062352A CN 200510006235 A CN200510006235 A CN 200510006235A CN 100530520 C CN100530520 C CN 100530520C
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郑在垠
金钟玟
朴永俊
李亢雨
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Samsung SDI Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
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    • 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
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    • 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
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    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
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    • G02F1/133604—Direct backlight with lamps
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    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
    • H01J1/02—Main electrodes
    • H01J1/30—Cold cathodes, e.g. field-emissive cathode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J63/00—Cathode-ray or electron-stream lamps
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    • G02—OPTICS
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    • 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
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    • 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
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Abstract

本发明提供了一种场发射背光装置。该场发射背光装置包括：前衬底和后衬底，它们平行设置，且彼此间隔开预定距离；阳极和阴极，该阳极和阴极彼此相对地设置在前衬底和后衬底的相应内表面上；荧光层，该荧光层形成在阳极上并具有预定厚度；凸出部分，该凸出部分由多个凸出的突起构成，该凸出部分形成在前衬底的与阳极相对的外表面上；以及电子发射器，该电子发射器形成在阴极上，以便通过施加场来发射电子。

Description

场发射背光装置
技术领域
本发明涉及一种场发射背光装置，并尤其涉及一种可用于液晶显示器(LCD)中的场发射背光装置。
背景技术
液晶显示器(LCD)包括在后侧产生白光的背光装置。过去，主要将冷阴极荧光灯用作背光装置。然而，需要一种板状的背光装置来提供更薄的背光装置。
图1是示出传统背光装置的结构的示意性横截面图。
参照图1，在前衬底1和后衬底4之间设置间隔件(未示出)，并且前衬底1和后衬底4之间的壁(未示出)被密封。在后衬底4上设置板状或条带形式的阴极5，而例如由碳纳米管(CNT)制成的电子发射器6形成在阴极5上。作为透明电极的阳极2形成在前衬底1上，并且荧光层3涂敷在阳极2上。
附图标记8表示扩散片，该扩散片是为了克服穿过前衬底1的光线不均匀这个问题而提供的。
当预定的电压施加到阴极5和阳极2之间时，电子从电子发射器6射出，来激励荧光层3。从荧光层3产生的光通过荧光层3、阳极2、前衬底1和扩散片8进入LCD(液晶显示器)。
传统的板状背光装置由于使用扩散片8而存在生产成本高这个问题。此外，由于一部分光线反射到有效区域(active area)之外而光线损失高。
于是，需要对发出均匀光线的背光装置加以改进，而不需要扩散片。
发明内容
本发明提供了一种场发射背光装置，该背光装置通过在其前衬底的一侧上形成凸出部分而具有改善的亮度均匀性。
根据本发明的一个方面，提供了一种场发射背光装置，其包括：前衬底和后衬底，它们平行设置，且彼此间隔开预定距离；阳极和阴极，该阳极和阴极彼此相对地设置在前衬底和后衬底的相应内表面上；荧光层，该荧光层形成在阳极上并具有预定厚度；凸出部分，该凸出部分由多个凸出的突起构成，这些突起形成在前衬底的与阳极相对的外表面上；以及电子发射器，该电子发射器形成在阴极上，以便由所施加的场来发射电子。
场发射背光装置还包括形成在荧光层上的反射膜，以将荧光层发出的光线反射向前衬底。
突起的尺寸可以从几十μm到几十纳米。
凸出的突起可以通过将具有多个凸出的突起的薄膜贴到前衬底的外表面上来形成。
反射膜可以由铝制成。反射膜可以形成为
Figure C20051000623500041
的厚度。
电子发射器可以由碳纳米管(CNT)材料形成。
附图说明
本发明的上述和其他特征和优点将通过参照附图详细描述本发明的示例性实施例变得更清楚，图中：
图1是说明用于液晶显示器(LCD)的传统背光装置的结构的示意性横截面图；
图2是说明根据本发明优选实施例的场发射背光装置的结构的示意性横截面图；
图3是说明图2中的前衬底101的结构的扫描电子显微镜(SEM)照片；
图4A到4C是说明制造根据本发明的前衬底的方法的示意性横截面图；以及
图5是示出铝发射膜对提高亮度的效果的试验结果曲线。
具体实施方式
此后，将参照附图详细描述根据本发明的场发射背光装置的实施例。在附图中，层和区域的尺寸被放大示出，这是为了说明更清楚。
图2是说明根据本发明优选实施例的场发射背光组件的结构的示意性横截面图。
参照图2，前衬底101和后衬底121平行设置，彼此间隔开预定距离。前衬底101和后衬底121可以由透明材料制成，如玻璃。前衬底101是这样的元件，即，从荧光层104发出的光线通过该前衬底101发出，这将在后面描述，并且它放置在LCD(液晶显示器)的后侧。
在前衬底101的内表面上设置阳极102，例如，ITO透明电极。在阳极102的内表面上，涂敷预定厚度的荧光层104，例如该厚度为10μm。荧光层104由电子发射器所发出的电子所激励，并产生可见光。
凸出部分106形成在前衬底101的外表面上，这提供了本发明的特征。在凸出部分106中，形成尺寸从几十μm到几十纳米的凸出突起106a。凸出部分106可以在制造前衬底101的过程中形成在该表面上。另外，可以将一个例如由聚酯形成的单独的薄膜贴到前衬底101的外表面上，该薄膜在其表面上具有凸出突起106a。在凸出部分106中的突起106a是凸出形状的，并且可以收集从荧光层104产生的光线。从而，本发明减少了光线损失，光线损失是在现有技术中光线发散到有效区域之外而导致的。而且，可以改善场发射背光装置的亮度均匀性。从而，它可以排除现有技术中使用扩散片。
厚度为的铝反射膜108形成在荧光层104上，该反射膜提供了本发明的另一特征。铝反射膜108将荧光层104产生的光线发射到前衬底101，来提高光透射效率。铝反射膜108还作用为保护荧光层104免受发射器发出的电子影响。
阴极122形成在后衬底121上。ITO透明电极可以用作阴极122。发射器，例如由碳纳米管(CNT)材料制成的发射器形成在阴极122上。
现在，参照附图详细描述具有上述结构的背光装置的工作方式。
当1.5到2.5kV的脉冲电压施加到阳极120和阴极122之间时，从阴极122的CNT材料124发出电子。所发出的电子穿过铝反射膜108而向阳极102传播，并然后激励荧光层104。然后，从荧光层104产生可见光。一些可见光直接穿过前衬底101，而其他光线由反射膜108反射，并然后穿过前衬底101。在光线穿过前衬底101之后，它在凸出部分106处改变路线，从而光线可以汇集在有效区域上。这导致背光装置的亮度均匀性得以改善。
图3是说明图2中的前衬底101的结构的扫描电子显微镜(SEM)照片。
参照图3，ITO电极102、荧光层104和铝发射膜108依次形成在玻璃前衬底101上。
图4A到4C是说明制造前衬底101的方法的示意性横截面图，这提供了本发明的另一特征。
首先，参照图4A，凸出部分106形成在玻璃衬底101的第一表面上，而ITO电极102涂敷在玻璃衬底101的第二表面上。凸出部分106可以在制造玻璃衬底的过程中形成在第一表面上。另外，在表面上具有凸出突起106a的聚酯薄膜可以贴到玻璃衬底的第一表面上。
然后，参照图4B，具有预定厚度，例如10μm的荧光层104涂敷在ITO电极102上。然后，ITO电极102上的荧光层104旋涂有粘结剂105。该粘结剂105作用为将荧光层104与ITO电极102和铝反射膜108粘贴，这将在后面描述。
参照图4C，通过溅镀方法，铝反射膜108形成在荧光层104上。
图5是示出铝发射膜对提高亮度的效果的试验结果曲线。
参照图5，可以看出当1.5到2.0kV的脉冲电压施加到阳极102上时，亮度提高大约30％。
根据本发明的场发射背光装置通过在前衬底的一侧上形成凸出部分而在另一侧上形成反射膜而亮度均匀性提高。从而，可以消除使用扩散片，因此，降低了背光装置的制造成本。
虽然本发明已经参照其示例性实施例加以具体图示和描述，本领域技术人员可以理解到在不背离如所附权利要求书限定的本发明的精髓和范围前提下可以对本发明在形式和细节上作出各种改进。

Claims (5)

1.一种场发射背光装置，包括：
前衬底和后衬底，它们平行设置，且彼此间隔开预定距离；
阳极和阴极，该阳极和阴极彼此相对地设置在前衬底和后衬底的相应内表面上；
荧光层，该荧光层形成在阳极上并具有预定厚度；
凸出部分，该凸出部分具有多个凸出的突起，该凸出部分形成在前衬底的与阳极相对的外表面上；
电子发射器，该电子发射器形成在阴极上，以便通过施加场来发射电子，以及
反射膜，该反射膜形成在荧光层上，以便将荧光层产生的光线朝向前衬底反射。
2.如权利要求1所述的场发射背光装置，其中，凸出部分是通过将具有多个凸出的突起的薄膜贴到前衬底的外表面上来形成的。
3.如权利要求1所述的场发射背光装置，其中，反射膜由铝制成。
4.如权利要求2所述的场发射背光装置，其中，反射膜形成为500
Figure C2005100062350002C1
厚度。
5.如权利要求1所述的场发射背光装置，其中，电子发射器由碳纳米管材料形成。
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US7867616B2 (en) * 2005-06-17 2011-01-11 Honda Motor Co., Ltd. Carbon single-walled nanotubes as electrodes for electrochromic glasses
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