US3836230A
Expired / Lapsed
US
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Liquid crystal display system
Assignee: Xerox Corp
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Filing: 1973-06-27
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Granted: 1974-09-17
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Expires: 1993-06-27
Abstract
Abstract A liquid crystal color display system which utilizes a plurality of films or layers of optically negative liquid crystalline materials as passive light discriminating screens is disclosed. The display system may be operated in a two color mode or a three color mode and has the capability of producing various color hues. The system lends itself to operation at very high frequency.
Inventors
- 👤 J Adams
- 👤 J Becker
- 👤 W Haas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 06:31
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0063; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; G02F1/13471; G02F1/13473; G02F2201/00; G02F2201/34; G02F2201/343
Claims Analysis
Total Claims: 35
Claim 1
Independent Claim
138 words
A liquid crystalline color display device comprising a. means for providing substantially completely linearly polarized light; b. electro-optic means capable of changing the state of polarization of light positioned in the path of light provided by said light providing means; c. scanning means for distributing light across a display screen, said scanning means positioned in the path of light exiting from said electro-optic means; and d. a display screen positioned to receive light from said scanning means, said display screen comprising at least two films of optically negative liquid crystalline materials having a light refleCtion band with center wavelength lambda o, wherein the optically negative liquid crystalline material comprising at least one of said films has a lambda o and intrinsic rotatory sense different than those of the optically negative liquid crystalline material comprising the other said film.
Claim 2
Dependent Claim
138 words
A liquid crystalline color display device comprising a. means for providing substantially completely linearly polarized light; b. electro-optic means capable of changing the state of polarization of light positioned in the path of light provided by said light providing means; c. scanning means for distributing light across a display screen, said scanning means positioned in the path of light exiting from said electro-optic means; and d. a display screen positioned to receive light from said scanning means, said display screen comprising at least two films of optically negative liquid crystalline materials having a light refleCtion band with center wavelength lambda o, wherein the optically negative liquid crystalline material comprising at least one of said films has a lambda o and intrinsic rotatory sense different than those of the optically negative liquid crystalline material comprising the other said film.
Claim 3
Dependent Claim
37 words
The display device as defined in claim 1 wherein said display screen further includes means for shifting the location of the light reflection band of at least one of said films of optically negative liquid crystalline material.
Claim 4
Dependent Claim
42 words
The display device as defined in claim 2 wherein at least one of said films of optically negative liquid crystalline material of said display screen is arranged between a pair of electrodes at least one of which is substantially transparent and isotropic.
Claim 5
Dependent Claim
20 words
The display device as defined in claim 1 wherein said display screen further includes at least one optical filter element.
Claim 6
Dependent Claim
17 words
The display device as defined in claim 4 wherein said display screen includes a neutral density filter.
Claim 7
Dependent Claim
35 words
The display device as defined in claim 1 wherein at least two of said optically negative liquid crystal films of said display screen are provided on opposite surfaces of a substantially transparent isotropic support member.
Claim 8
Dependent Claim
22 words
The display device as defined in claim 6 wherein said support member is from about 0.5 to about 5 microns in thickness.
Claim 9
Dependent Claim
23 words
The display device as defined in claim 1 wherein said means for providing substantially completely linearly polarized light comprises a multiple wavelength laser.
Claim 10
Dependent Claim
31 words
The display device as defined in claim 1 wherein said optically negative liquid crystalline films each have a thickness in the range of from about 0.5 micron to about 50 microns.
Claim 11
Dependent Claim
31 words
The display device as defined in claim 1 wherein said optically negative liquid crystalline films each have a thickness in the range of from about 0.5 micron to about 20 microns.
Claim 12
Dependent Claim
35 words
The display device as defined in claim 1 wherein the optically negative liquid crystalline materials comprising each said film of said display screen have a lambda o in the visible region of the electromagnetic spectrum.
Claim 13
Dependent Claim
41 words
The display device as defined in claim 11 wherein said display screen comprises three films of optically negative liquid crystalline materials, said liquid crystalline materials having a lambda o in the red, blue and green regions of the visible spectrum respectively.
Claim 14
Dependent Claim
20 words
The display device as defined in claim 12 wherein said display screen further includes at least one optical filter element.
Claim 15
Dependent Claim
31 words
The display device as defined in claim 11 wherein said display screen comprises two films of optically negative liquid crystalline materials, at least one optical filter element and a reflecting surface.
Claim 16
Dependent Claim
42 words
The display device as defined in claim 11 wherein said display screen comprises four films of optically negative liquid crystalline materials, and wherein two of said films comprise optically negative materials having substantially the same lambda o but opposite intrinsic rotatory sense.
Claim 17
Dependent Claim
20 words
The display device as defined in claim 15 wherein said display screen further includes at least one optical filter element.
Claim 18
Dependent Claim
31 words
The display device as defined in claim 11 wherein said optically negative liquid crystalline films each have a thickness in the range of from about 3 microns to about 10 microns.
Claim 19
Independent Claim
142 words
A method for providing a color display comprising a. providing a display screen comprising at least two films of optically negative liquid crystalline materials having a light reflection band with center wavelength lambda o, wherein the optically negative liquid crystalline material comprising at least one of said films has lambda o and intrinsic rotatory sense different than those of the optically negative liquid crystalline material comprising the other said film; b. providing a beam of substantially completely linearly polarized light, said light including wavelengths corResponding to the lambda o of the optically negative liquid crystalline materials comprising at least two of said films; c. changing the state of polarization of said light in accordance with some predetermined sequence of signals; and d. directing said light upon said display screen in a pattern corresponding to a desired image whereby an image is observed.
Claim 20
Independent Claim
142 words
A method for providing a color display comprising a. providing a display screen comprising at least two films of optically negative liquid crystalline materials having a light reflection band with center wavelength lambda o, wherein the optically negative liquid crystalline material comprising at least one of said films has lambda o and intrinsic rotatory sense different than those of the optically negative liquid crystalline material comprising the other said film; b. providing a beam of substantially completely linearly polarized light, said light including wavelengths corResponding to the lambda o of the optically negative liquid crystalline materials comprising at least two of said films; c. changing the state of polarization of said light in accordance with some predetermined sequence of signals; and d. directing said light upon said display screen in a pattern corresponding to a desired image whereby an image is observed.
Claim 21
Dependent Claim
19 words
The method as defined in claim 18 wherein said light is directed upon said display screen at normal incidence.
Claim 22
Dependent Claim
23 words
The method as defined in claim 18 wherein said substantially completely linearly polarized light is provided by means comprising a multiple wavelength laser.
Claim 23
Dependent Claim
19 words
The method as defined in claim 18 wherein said display screen further includes at least one optical filter element.
Claim 24
Dependent Claim
16 words
The method as defined in claim 21 wherein said display screen includes a neutral density filter.
Claim 25
Dependent Claim
34 words
The method as defined in claim 18 wherein at least two of said optically negative liquid crystal films of said display screen are provided on opposite surfaces of a substantially transparent isotropic support member.
Claim 26
Dependent Claim
21 words
The method as defined in claim 23 wherein said support member is from about 0.5 to about 5 microns in thickness.
Claim 27
Dependent Claim
30 words
The method as defined in claim 18 wherein said optically negative liquid crystalline films each have a thickness of the range of from about 0.5 micron to about 50 microns.
Claim 28
Dependent Claim
30 words
The method as defined in claim 18 wherein said optically negative liquid crystalline films each have a thickness in the range of from about 0.5 micron to about 20 microns.
Claim 29
Dependent Claim
34 words
The method as defined in claim 18 wherein the optically negative liquid crystalline materials comprising each said film of said display screen have a lambda o in the visible region of the electromagnetic spectrum.
Claim 30
Dependent Claim
39 words
The method as defined in claim 27 wherein said display screen comprises three films of optically negative liquid crystalline materials, said liquid crystalline materials having a lambda o in the red, blue and green regions of the spectrum respectively.
Claim 31
Dependent Claim
19 words
The method as defined in claim 28 wherein said display screen further includes at least one optical filter element.
Claim 32
Dependent Claim
39 words
The method as defined in claim 27 wherein said display screen comprises two films of optically negative liquid crystalline materials, at least one optical filter element and a reflecting rear surface and wherein said image is viewed in reflection.
Claim 33
Dependent Claim
41 words
The method as defined in claim 27 wherein said display screen comprises four films of optically negative liquid crystalline materials and wherein two of said films comprise optically negative materials having substantially the same lambda o but opposite intrinsic rotatory sense.
Claim 34
Dependent Claim
19 words
The method as defined in claim 31 wherein said display screen further includes at least one optical filter element.
Claim 35
Dependent Claim
30 words
The method as defined in claim 27 wherein said optically negative liquid crystalline films each have a thickness in the range of from about 3 microns to about 10 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-09-16 | 1978-03-18 | 1978-09-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-16 | 1982-03-18 | 1982-09-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-16 | 1986-03-18 | 1986-09-17 | $7700.00 | Window Closed / Lapsed |