Abstract A high brightness, field sequential color television display system utilizing electronically controlled color switching of ferro-electric ceramic wafers. The stationary filter provides a color change electronically and color switching is the result of selected retardations of the signals for each of the basic red, green and blue colors so that a rapid field sequential operation is performed. The system employs two polaroid filters, the polarizer and the analyzer, with a ceramic material positioned intermediate thereto, to control the polarization of the light passing through it by the desired amounts and therefore provide the primary colors. Wavelength selection over a relatively narrow bandwidth is thus achieved by using a material with the property to obtain angles for transmission as a function of the wavelength. The color image is formed in the field sequential fashion by placing the spectral filter in front of a cathode ray tube and observing the various intensities of white light on the face of the tube through the composite filter.
A field sequential television system comprising a sequentially scanned cathode ray tube having a screen scanned with a sequence of fields and providing a light source, ferro-electric filter means positioned adjacent to said screen and having selectable signal retardation characteristics and including a ferro-electric ceramic material, a deposited first and second interdigital structure on one side of said wafer and first and second polarizers on opposite sides of said wafer, said first polarizer, said ferro-electric ceramic wafer and said second polarizer being respectively positioned between said screen and a viewer, said first polarizer polarizing the light to a predetermined angle and the second polarizer being an analyzer having a predetermined polarity relative to said first polarizer, said ceramic wafer rotating the signals of each wavelength of said light source so that only one bandwidth passes through said analyzer to said viewer during each field of said sequence, and a control source coupled to said first and second interdigital structures controlling the rotation of said ceramic wafer so that different bandwidths pass therethrough during each field.
Claim 2
Dependent Claim
175 words
A field sequential television system comprising a sequentially scanned cathode ray tube having a screen scanned with a sequence of fields and providing a light source, ferro-electric filter means positioned adjacent to said screen and having selectable signal retardation characteristics and including a ferro-electric ceramic material, a deposited first and second interdigital structure on one side of said wafer and first and second polarizers on opposite sides of said wafer, said first polarizer, said ferro-electric ceramic wafer and said second polarizer being respectively positioned between said screen and a viewer, said first polarizer polarizing the light to a predetermined angle and the second polarizer being an analyzer having a predetermined polarity relative to said first polarizer, said ceramic wafer rotating the signals of each wavelength of said light source so that only one bandwidth passes through said analyzer to said viewer during each field of said sequence, and a control source coupled to said first and second interdigital structures controlling the rotation of said ceramic wafer so that different bandwidths pass therethrough during each field.
Claim 3
Dependent Claim
59 words
The system of claim 1 in which said ferro-electric ceramic structure is formed of a plurality of sections each having a separate first and second interdigital fingers on the same side of said wafer coupled to said control source, and said control source providing separate and sequential energizing of each of said plurality of sections during each field scan.
Claim 4
Dependent Claim
14 words
The system of claim 1 in which the sequence of fields provides interlaced fields.