Claims
- 1. A method for producing a phosphor screen for a color cathode ray tube, the tube comprising a face panel having interior and exterior surfaces, the method comprising photolithographically disposing an array of phosphor elements of at least two colors on the interior surface of the face panel, the array being formed by transmitting light including UV light through an aperture mask to expose portions of photosensitive phosphor layers provided on the face panel corresponding to the array and developing the layers to remove the unexposed portions of the photosensitive phosphor layers,
- characterized in that a UV reflective filter is provided on the interior surface of the face panel, prior to provision thereon of the photosensitive phosphor layers and exposure of said layers to reflect transmitted UV light back onto those portions of the layers from which such light was transmitted thereby increasing the exposure dosage of the layers.
- 2. The method of claim 1 in which the UV-reflective filter comprises alternating layers of high and low refractive index material.
- 3. The method of claim 2 in which the high refractive index material is TiO.sub.2 and the low refractive index material is SiO.sub.2.
- 4. The method of claim 2 in which there are 22 layers.
Parent Case Info
This is a continuation of application Ser. No. 08/207,502, filed Mar. 8, 1994 and now abandoned.
US Referenced Citations (11)
Continuations (1)
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Number |
Date |
Country |
Parent |
207502 |
Mar 1994 |
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