CN1060583C - 制造彩色阴极射线管的方法 - Google Patents

制造彩色阴极射线管的方法 Download PDF

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CN1060583C
CN1060583C CN96110834A CN96110834A CN1060583C CN 1060583 C CN1060583 C CN 1060583C CN 96110834 A CN96110834 A CN 96110834A CN 96110834 A CN96110834 A CN 96110834A CN 1060583 C CN1060583 C CN 1060583C
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丁海法
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    • H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
    • H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
    • H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
    • H01J29/18—Luminescent screens
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    • H—ELECTRICITY
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    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/20—Manufacture of screens on or from which an image or pattern is formed, picked up, converted or stored; Applying coatings to the vessel
    • H01J9/22—Applying luminescent coatings
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    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
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    • H01J9/22—Applying luminescent coatings
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Abstract

本发明涉及制造彩色阴极射线管的方法，可防止红色荧光剂色纯度的劣化，提高亮度和对比度，包括步骤：通过将包括铕(Eu)的激活剂与Y2O3一起加入红色荧光剂，形成黑底膜，激活剂的含量为0.067～0.075克；形成三色荧光膜，包括绿色荧光剂，具有50～70%反射率的红颜料用量的红色荧光剂，具有50～60%反射率的蓝颜料用量的蓝色荧光剂；在三色荧光膜上涂敷有机膜，并在其上形成金属反射膜；分解有机膜，从而形成荧光屏。

Description

制造彩色阴极射线管的方法
本发明涉及制造彩色阴极射线管的方法，特别涉及能防止红色荧光剂色纯度下降，同时可提高彩色阴极射线管的亮度和对比度的制造方法。
通常，按下列工艺步骤制备彩色阴极射线管的荧光屏：如图1所示，在屏盘玻璃1上均匀涂敷感光溶液，然后，在此配合使用荫罩，相应于绿(G)、蓝(B)和红(R)三色进行曝光；用纯水对获得的屏盘进行显影，以形成光敏(photoresist)膜；在其上形成不吸收光的材料的黑底(black matrix)层，然后通过氧化剂水溶液处理，形成相应于绿、蓝和红三色的黑底膜2；在所说的黑底膜2上，通过形成绿色荧光剂3G，粘附着蓝颜料4B的蓝色荧光剂3B和粘附着红颜料4R的红色荧光剂3R，形成三色荧光剂而构成荧光膜；在所说的荧光膜上形成有机膜；然后，在其上光滑地形成金属反射膜5之后，在450℃的高温下加热分解所说的有机涂膜，释放出气体。
在如上所述制造彩色阴极射线管的常规方法中，由于将蓝颜料4B附着于蓝色荧光剂3B上而再现接近自然色的蓝色，将红颜料4R附着于红色荧光剂3R上而再现接近自然色的红色，因而改善了彩色阴极射线管的对比度。也就是说，通过改变分别粘附到蓝色荧光剂和红色荧光剂的蓝颜料和红颜料的附着量而降低蓝色荧光剂和红色荧光剂的反射率，可一般地改善彩色阴极射红管的对比度。在其中粘附蓝颜料的蓝色荧光剂的反射率为20～50％，在其中粘附红颜料的红色荧光剂的反射率为30～50％。由于如上所述增加颜料的附着量来降低反射率，因此，在粘附颜料时使颜料聚集，或者颜料不能均匀地分散在荧光剂颗粒中。从而导致颜料与荧光膜分隔，并由于荧光剂的发光亮度劣化而使彩色阴极线管的亮度降低。
因此，本发明的目的在于提供一种制造彩色阴极射线管的方法，该方法能够防止红色荧光剂色纯度下降，同时可提高彩色阴极射线管的亮度和对比度。
为实现上述目的，本发明提供的制造彩色阴极射线管的方法，包括步骤：在屏盘内表面形成对应于绿(G)，兰(B)和红(R)三色的黑底膜，在黑底膜形成三色荧光膜，该三色荧光膜包括绿色荧光剂，具有50～70％反射率的红颜料的红色荧光剂，和具有50～65％反射率的蓝颜料的蓝荧光剂；通过将包括铕(Eu)的激活剂与Y2O3一起加入红色荧光剂，所述激活剂的含量相对于1摩尔Y2O3为0．067～0．075克；在上述三色荧光膜上涂敷有机膜，并在涂敷的有机膜上形成金属反射膜；分解有机膜。从而制得荧光屏。
图1是按照常规方法的彩色阴极射线管荧光屏的剖面图；
图2是本发明的彩色阴极射线管荧光屏的剖面图；
图3是显示相应于屏盘玻璃的透射率的对比度和亮度关系的曲线；
图4是显示相应于荧光剂反射的对比度和亮度关系的曲线；
图5是本发明彩色阴极射线管的红色荧光膜的C．I．E．色谱图。
下面，将详细描述本发明的制造方法。
首先，在具有36～45％的透射率的屏盘玻璃101表面上，形成相应于绿、蓝和红三色的黑底膜2，该黑底膜2为光吸收层。然后，在黑底膜102上形成绿色荧光剂、接着是蓝色和红色荧光剂。在本实施例中，使用这样荧光剂，即在蓝色荧光剂103B和红色荧光剂103R上分别包着使蓝色荧光剂的反射率增加50～65％，使红色荧光剂的反射率增加50～70％的预定量的蓝颜料104B和红颜料104R。如上所述，通过减少蓝颜料104B和红颜料104R的附着量来增加反射率，从而提高蓝色荧光剂和红色荧光剂的发光效率。在上述三色荧光膜上涂敷有机膜之后，在其上形成金属反射膜105，然后在高温下使有机膜热分解，从而形成如图2所示的荧光屏。
而且，在红色荧光剂103R中，当减少红色颜料的附着量以增加反射率时，产生色纯度下降的问题。通过少量地增加作为红色荧光剂的激活剂的铕的含量，使其多于常规彩色阴极射线管的含量(相对于1摩尔Y2O3的Eu的含量：(0．04～0．066g)，达到0．067～0．075克的原子重量来防止色纯度下降。
从图3中可知，当屏盘玻璃的透过率低于36％时，对比度显著地提高，而彩色阴极射线管的亮度显著地降低；当它高于45％时，亮度提高而对比度降低。因此，使用具有低于常规屏盘玻璃的透射率(42～52％)的低透射率(36～45％)屏盘玻璃，可提高对比度。
此外，将附着于蓝色荧光剂103B的蓝颜料104B用量减少至预定量，使透射率达50～65％高于常规彩色阴极射线管蓝荧光剂时的透射率(20～50％)；将附着于红色荧光剂的透射率(103R)的红颜料104R用量减少至预定量，使透射率达50～70％高于常规彩色阴极射线管红色荧光剂时的透射率(30～50％)。
结果，如图4所示，当蓝荧光剂和红色荧光剂的反射率分别为50～65％和50～70％时，彩色阴极射线管的对比度和高度理想。在荧光剂的反射率低于50％时，由于荧光剂的发光效率降低而使彩色阴极射线管的亮度下降；在荧光剂的反射率大于65％或70％时，荧光剂的发光效率增加，致使亮度增加，但彩色阴极射线管的对比度降低，并由于阴极射线管主体外部的颜色变白而使黑色效果降低。
然而，如上所述，如果用减少附着于红色荧光剂(103R)的红颜料104R的附着量来增加荧光剂的反射率，则由于在C．I．E．色谱图上颜色坐标的改变而使红色荧光剂的色纯度降低。通过少量地增加决定红色荧光剂色纯度的因素的激活剂铕(Eu)含量至0．067～0．075g，就可解决该问题。如图5所示，如果将铕含量少量增至0．067～0．075g，则本发明的红色荧光剂的色彩再现范围(A)就大于常规红色荧光剂的色彩再现范围(B)，结果，与典型的红色荧光剂相比，色纯度提高了5～10％。
正如以上所作的说明，按照本发明的制造方法制备的彩色阴极射线管，通过减少附着于蓝色荧光剂和红色荧光剂的蓝颜料和红颜料的附着量，防止了在制备的荧光膜中颜料的聚结和隔离，从而能够改善产品的生产率，并且通过增加蓝色荧光剂和红色荧光剂的反射率，能够比常规彩色阴极射线管的亮度提高10～15％。并且，通过采用低透射率的屏盘玻璃和少量增加作为红色荧光剂的激活剂的铕用量，则由于色彩再现范围的扩大而改善色纯度，同时提高彩色阴极射线管的对比度。

Claims (2)

1．一种制造彩色阴极射线管的方法，其特征在于包括步骤：
在屏盘内表面形成对应于绿(G)，兰(B)和红(R)三色的黑底膜，
在黑底膜上形成三色荧光膜，该三色荧光膜包括绿色荧光剂，具有50～70％反射率的红颜料的红色荧光剂，和具有50～65％反射率的蓝颜料的蓝荧光剂；
通过将包括铕(Eu)的激活剂与Y2O3一起加入红色荧光剂，所述激活剂的含量相对于1摩尔Y2O3为0．067～0．075克；
在上述三色荧光膜上涂敷有机膜，并在涂敷的有机膜上形成金属反射膜；
分解有机膜。
2．根据权利要求1的制造彩色阴极射线管的方法，其特征在于：屏盘玻璃的透射率在36～45％的范围内。
CN96110834A 1995-07-28 1996-07-29 制造彩色阴极射线管的方法 Expired - Fee Related CN1060583C (zh)

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JPH10302667A (ja) * 1997-04-28 1998-11-13 Nec Kansai Ltd カラー陰極線管とその製造方法
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US4307320B1 (en) * 1978-02-03 1993-12-28 Kasei Optonix, Ltd. Pigment coated phosphor and high contrast color television cathode ray tube using same

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US5859494A (en) 1999-01-12
IN192510B (zh) 2004-04-24
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