US3797913A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-optic display device
Assignee: Sony Corp
•
Filing: 1971-11-29
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Granted: 1974-03-19
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Expires: 1991-11-29
Abstract
Abstract In an electro-optic display device comprising a polarizing plate and a display panel having a plurality of electro-optic elements arranged in a predetermined pattern on a suitable base plate, in which a suitable voltage is selectively supplied to the plurality of electro-optic elements to alter the angle of double refracted light in response to the voltage, the electro-optic display device further comprising a means formed between the display panel and the polarizing plate for supplying circular polarized light to the electro-optic elements.
Inventors
- 👤 T Mori
- 👤 C Kojima
- 👤 H Tamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:33
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/03; G02F1/0305
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
148 words
An electro-optic display device providing uniform brightness of display comprising a five plate sandwich, the center plate being formed of an isotropic light transmitting material and having a plurality of solid electro-optic elements of different sizes disposed therein at any desired angular orientation, the outer plates being polarizing plates, the intermediate plates between said outer plates and said center plates being double refracting plates with their ray axes disposed at 45* to the polarizing plane of their respective associated outer plates, said electro-optic elements being formed of a material which changes the angle of double refraction of light in response to an impressed voltage thereon and means to selectively impress a voltage on at least one of said electro-optic elements and the material forming said electro-optic elements being such that the planes of polarization of light passing therethrough will be shifted 90* when a voltage is applied thereto.
Claim 2
Dependent Claim
148 words
An electro-optic display device providing uniform brightness of display comprising a five plate sandwich, the center plate being formed of an isotropic light transmitting material and having a plurality of solid electro-optic elements of different sizes disposed therein at any desired angular orientation, the outer plates being polarizing plates, the intermediate plates between said outer plates and said center plates being double refracting plates with their ray axes disposed at 45* to the polarizing plane of their respective associated outer plates, said electro-optic elements being formed of a material which changes the angle of double refraction of light in response to an impressed voltage thereon and means to selectively impress a voltage on at least one of said electro-optic elements and the material forming said electro-optic elements being such that the planes of polarization of light passing therethrough will be shifted 90* when a voltage is applied thereto.
Claim 3
Dependent Claim
24 words
An electro-optic display device according to claim 1 including a scattering reflecting plate attached to one of said outer plates of said plate sandwich.
Claim 4
Dependent Claim
63 words
An electro-optic display device according to claim 1 in which one of said outer plates has one portion which extends beyond the edge of said sandwich, a light scattering reflecting plate mounted at a 45* angle to the plane of said center plate and which abutts an edge of said one outer plate which is opposite said one portion of said one plate.
Claim 5
Dependent Claim
28 words
An electro-optic display device according to claim 3 including a light introducing means connected to said light scattering and reflecting plate to provide light to said electro-optic elements.
Claim 6
Dependent Claim
48 words
An electro-optic display device according to claim 1 wherein said plurality of electro-optic elements comprise at least seven elements arranged in a pattern such that the integers from zero to nine can be selectively displayed and wherein the elements may have any desired angular relationship to each other.
Claim 7
Dependent Claim
31 words
An electro-optic display device according to claim 1 in which one of said outer plates is linearly polarized in the X-plane and the other outer plate is polarized in the Y-plane.
Claim 8
Dependent Claim
22 words
An electro-optic display device according to claim 1 in which both of said outer plates are linearly polarized in the same plane.
Claim 9
Dependent Claim
65 words
An electro-optic display device according to claim 1 in which said electro-optic elements are blocks of Bi12 GeO20 with one pair of peripheral surfaces in the plane (110) and with a second pair of peripheral surfaces in the plane (110) the ray axes of said elements being in the direction and in directions perpendicular thereto and at an angle of 45* to the (110) direction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-03-18 | 1977-09-17 | 1978-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-03-18 | 1981-09-17 | 1982-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-03-18 | 1985-09-17 | 1986-03-19 | $7700.00 | Window Closed / Lapsed |