H - Electricity – 01 – J
Patent
H - Electricity
01
J
313/35.3405
H01J 29/18 (2006.01) G02B 5/28 (2006.01) H01J 29/28 (2006.01)
Patent
CA 1229123
16 Abstract "Display tube." 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 14 to 30 layers, each having an opical thickness nd, wherein n is the refractive index of the material and d is the thickness, which optical thickness is between 0.2 .lambda.f and 0.3 .lambda.f and preferably between 0.23 .lambda.f and 0.27 .lambda.f, wherein .lambda.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° largerthan in a tube without such a filter. Colour improvement and gain in contrast also occur.
485720
Brandsma Titus E.c.
Rijpers Johannes C.n.
Spruit Johannes H.m.
Vriens Leendert
Koninklijke Philips Electronics N.v.
Van Steinburg C.e.
LandOfFree
Display tube with multilayer interference filter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Display tube with multilayer interference filter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Display tube with multilayer interference filter will most certainly appreciate the feedback.
Profile ID: LFCA-PAI-O-1183621