Color display utilizing twisted nematic LCDs and selective polarizers
First Claim
1. A full color liquid crystal display, comprising:
- first, second, and third subtractive LCD filters, each filter comprising means for independently subtracting one of the primary colors (red, green, blue) from a polychromatic light beam without substantially affecting the other primary colors, each filter including;
an entrance selective dichroic polarizer for polarizing light of one of the primary colors while passing light of the other colors substantially unpolarized;
an LCD panel for selectively rotating incident light through a known twist angle;
an exit selective dichroic polarizer for selectively blocking or passing the light of the same one of the primary colors, depending upon the rotation imparted by the LCD panel, and passing light of the other colors.
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Accused Products
Abstract
A full color liquid crystal display comprises first, second, and third subtractive LCD filters, each filter comprising means for independently subtracting one of the primary subtractive colors from a polychromatic light beam, without substantially affecting the other subtractive colors. Each of the subtractive LCD filters combines wavelength selective dichroic polarizers with a twisted nematic liquid crystal cell to provide a filter that can selectively subtract varying amounts of incident spectral radiant energy from within one of three primary energy bands. A first selective polarizer that linearly polarizes wavelengths in the appropriate one of the above mentioned color bands, while passing light in the other two bands substantially unaffected, a first liquid crystal cell, and a second selective dichroic polarizer identical to the first polarizer, but positioned wih its axis of polarization perpendicular to that of the first polarizer. This filter will pass light of all colors when non-selected, but will block or subtract light of the particular color when in the selected state.
100 Citations
16 Claims
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1. A full color liquid crystal display, comprising:
first, second, and third subtractive LCD filters, each filter comprising means for independently subtracting one of the primary colors (red, green, blue) from a polychromatic light beam without substantially affecting the other primary colors, each filter including; an entrance selective dichroic polarizer for polarizing light of one of the primary colors while passing light of the other colors substantially unpolarized; an LCD panel for selectively rotating incident light through a known twist angle; an exit selective dichroic polarizer for selectively blocking or passing the light of the same one of the primary colors, depending upon the rotation imparted by the LCD panel, and passing light of the other colors. - View Dependent Claims (2, 3, 4, 5, 6)
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7. Display apparatus comprising:
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first, second, and third twisted nematic liquid crystal display panels for imparting an effective twist to applied incident spectral radiant energy between 0° and
about 90°
+n (180°
) where n=0, 1, 2, . . . as an exitation voltage is applied to the liquid crystal display panel;first, second, third, fourth, fifth, and sixth polarizers; the first liquid crystal display panel being disposed between the first and second polarizers, the second liquid crystal display panel being disposed between the third and fourth polarizers, and the third liquid crystal display panel being disposed between the fifth and sixth polarizers; the first and second polarizers characterized by selectively linearly polarizing the spectral radiant energy of a first primary color, while transmitting the spectral energy of second and third primary colors unaffected; the third and fourth polarizers selected to linearly polarize spectral radiant energy of the second primary color, while transmitting spectral radiant energy of the first and third primary colors unaffected; the characteristics of the fifth and sixth polarizer selected to linearly polarize spectral radiant energy of the third primary color, while transmitting the spectral energy of the first and second primary colors unaffected; the first, second, and third panels in cooperation with the selective polarizers adjacent thereto being operative, in combination, to block one of the primary colors, while transmitting the balance of incident spectral radiant energy unaffected when the panel is in a first state and for transmitting incident spectral radiant energy of all colors when the panel is in a second state. - View Dependent Claims (8, 9, 10, 11)
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12. Display apparatus comprising:
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first, second, and third twisted nematic liquid crystal display panels for imparting an effective twist to applied incident spectral radiant energy of between 0° and
about 90°
+n (180°
) where n=0, 1, 2, . . . as an exitation voltage is applied to the liquid crystal display panels;first, second, third, and fourth polarizers; the first panel disposed between the first and second polarizers, the second panel disposed between the second and third polarizers, and the third panel disposed between the third and fourth polarizers; the first polarizer being adapted to selectively linearly polarize spectral radiant energy corresponding to a first primary color, while transmitting spectral radiant energy of other colors substantially unaffected; the second polarizer operative to selectively linearly polarize spectral radiant energy of both the first and second primary colors, while transmitting spectral radiant energy of the third primary color substantially unpolarized; the third polarizer being selected to selectively linearly polarize spectral radiant energy of both the second and third primary colors, while transmitting spectal radiant energy of the first primary color substantially unpolarized; each of the fourth polarizer being selected to selectively linearly polarize the third primary color while transmitting the first and second primary colors unpolarized; the first, second, and third panels in cooperation with the selective polarizers adjacent thereto being operative, in combination, to block one of the primary colors while transmitting the balance of incident spectral radiant energy unaffected in a first state, and to pass incident spectral radiant energy of all colors in a second state. - View Dependent Claims (13, 14, 15)
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16. The display apparatus of claim 17 in which the third panel, when in a second state, is operative, in combination with the third and fourth selective polarizers adjacent thereto, to linearly polarize the spectral energy of the second and third primary colors, while transmitting the spectral energy of the first primary color unpolarized.
Specification