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公开(公告)号：US4634926A
公开(公告)日：1987-01-06
申请号：US662311
申请日：1984-10-18
CPC分类号： G02B5/285 , H01J29/185 , H01J29/28
摘要： A display tube comprising in an evacuated envelope (1) a display screen (7) provided on the inside of a display window (2) in the wall of the envelope (1), which display screen (7) comprises luminescent material (13), and a multilayer interference filter (12) is provided between this material and the display window and comprises a number of layers (HL) which alternately are manufactured from a material having a high (H) and a material having a low (L) refractive index. If the filter is composed substantially of 6 to 30 layers, each having an optical thickness nd, wherein n is the refractive index of the material and d is the thickness, which optical thickness is between 0.2.lambda..sub.f and 0.3.lambda..sub.f and preferably between 0.23.lambda..sub.f and 0.25.lambda..sub.f, wherein .lambda..sub.f is equal to p x.lambda., wherein .lambda. is the desired central wavelength which is selected from the spectrum emitted by the luminescent material (13) and p is a number between 1.15 and 1.45, a display tube is obtained in which the luminous efficiency in the forward direction is at least 40% larger than in a tube without such a filter. Color improvement and gain in contrast also occur.
摘要翻译： 一种显示管，包括在真空的外壳（1）中，设置在所述外壳（1）的壁上的显示窗（2）的内部的显示屏（7），所述显示屏（7）包括发光材料（13） ，并且在该材料和显示窗之间提供多层干涉滤光片（12），并且包括多个层（HL），其由具有高（H）的材料和具有低（L）折射率的材料交替地制造 指数。 如果滤光片基本上由6至30层组成，每层具有光学厚度nd，其中n是材料的折射率，d是厚度，其光学厚度在0.2λf和0.3λf之间，优选在0.23之间 λf和0.25λf，其中λf等于pxλ，其中λ是从发光材料（13）发射的光谱中选择的期望中心波长，p是1.15和1.45之间的数字，显示管 其中在正向上的发光效率比没有这种滤光器的管中的发光效率大至少40％。 颜色改善与增益的对比也发生了。
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公开(公告)号：US4647812A
公开(公告)日：1987-03-03
申请号：US742834
申请日：1985-06-10
CPC分类号： G02B5/285 , H01J29/185 , H01J29/28
摘要： A display tube comprising in an evacuated envelope (1) a display screen (7) provided on the inside of a display window (2) in the wall of the envelope (1), which display screen (7) comprises luminescent material (13), and a multilayer interference filter (12) is provided between this material and the display window and compises a number of layers (HL) which alternately are manufactured from a material having a high (H) and a material having a low (L) refractive index. If the filter is composed substantially of 14 to 30 layers, each having an optical thickness nd, wherein n is the refractive index of the material and d is the thickness, which optical thickness is between 0.2 .lambda..sub.f and 0.3 .lambda..sub.f and preferably between 0.23 .lambda..sub.f and 0.27 .lambda..sub.f, wherein .lambda..sub.f is equal to p x .lambda., wherein .lambda. is the desired central wavelength which is selected from the spectrum emitted by the luminescent material (13) and p is a number between 1.18 and 1.36, a display tube is obtained in which the luminous efficiency in the forward direction and at small angles for the central wavelength of the phosphor is at least 40% larger than in a tube without such a filter. Color improvement and gain in contrast also occur.
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