Fluorescent lamp for the color liquid crystal display device and

Details Fluorescent lamp for the color liquid crystal display device and Fluorescent lamp for the color liquid crystal display device and

1995-12-01

1998-05-26

Sikes, William L.

Liquid crystal cells, elements and systems

Particular structure

Particular illumination

349 71, 349106, 313487, G02F 11335

Patent

active

057574472

ABSTRACT:
A fluorescent lamp and a color liquid crystal display device, into which the fluorescent lamp is incorporated, use three-wavelength light emitting phosphers not to cause any interference fringe so as to eliminate color shadings from the display screen of said device. A phospher film consisting of a combination of the phosphers having their peak light emitting wavelengths at red, green and blue three-wavelength areas or ranges is formed on inner faces of a bulb of said fluorescent lamp, a half value width at the peak light emitting wavelength of each phospher i set to be in a range of 30 nm-100 nm, and a phospher defined by a general formula M.sub.3 (PO.sub.4).sub.2 :Sn, Mn (wherein M is at least one of Sr, Mg, Ba, Ca, Zn and Ga) is used as the red light emitting one. Fringes caused by the interference of light penetrating each optical component of the color liquid crystal display device with light reflected by front or boundary faces of these optical components can be thus prevented.

REFERENCES:
patent: 4199707 (1980-04-01), Akiyama et al.
patent: 4705986 (1987-11-01), Iwama et al.
patent: 4715687 (1987-12-01), Glass et al.
patent: 4748546 (1988-05-01), Ukrainsky
patent: 4799050 (1989-01-01), Prince et al.
patent: 4940918 (1990-07-01), Rutfield

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