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Projection television display tube and device having band pass interference filter

  • US 4,937,661 A
  • Filed: 07/11/1988
  • Issued: 06/26/1990
  • Est. Priority Date: 07/11/1988
  • Status: Expired due to Fees
First Claim
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1. A projection television display tube comprising in an evacuated envelope a display screen on the inside of a display window in the wall of the envelope, said display screen comprising a layer of a luminescent material and an aluminum backing layer, the tube further comprising multilayer interference filter between the luminescent material layer and the display window, the filter comprising a number of layers having a high (H) refractive index and a low (L) refractive index, characterized in that the interference filter is a band pass filter in which the filter layers are arranged in the sequence


  • space="preserve" listing-type="equation">1 2 2 1 . . . 2 1 2 2 1
where 1 and 2 are high (H) and low (L), or low (L) and high (H) refractive index layers, respectively.

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