US3873186A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display
Assignee: Motorola Solutions Inc
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Filing: 1973-09-18
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Granted: 1975-03-25
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Expires: 1993-09-18
Abstract
Abstract A liquid crystal display with an extended temperature range has a pair of serially aligned cells. One of the cells contains a liquid crystal material having a nematic temperature range extending from at least -20*C to 60*C while the liquid crystal material in the other cell has a nematic temperature range from at least 60*C to 100*C so that normal expected temperature ranges are covered. The two cells are defined by first, second and third plates which are secured in spaced parallel relation. The second or intermediate plate is a light transmitting plate which has electrodes on opposite surfaces in contact with each of the liquid crystal materials. The first and third plates have electrodes on only one side forming the second electrode for each of the two cells, one of said plates being reflective and the other transmissive.
Inventors
- 👤 Kim Ritchie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:44
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347; C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; G04; G04G; G04G9/00; G04G9/0023; G04G9/0029; G04G9/0035
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
180 words
A liquid crystal display comprising first, second and third plates, each having front and rear surfaces, first spacer means separating the front surface of said first plate from the rear surface of said second plate and forming a chamber for a first type of liquid crystal material, second spacer means separating the front surface of said second plate from the rear surface of said third plate and Forming a second cell for a second type of liquid crystal material, shaped light transmitting electrodes on the surfaces of said second plate within each of said cells for selectively applying electric field across said liquid crystal material, a pair of oppositely disposed electrodes in each of said cells on said first and third plates, the liquid crystal material in the first of said cells having a nematic temperature range of approximately -20*C to 60*C and the liquid crystal material arranged in said second cell being of a type having a nematic range of approximately 60*C to 100*C whereby the temperature range of the display is extended to cover broad range temperature conditions.
Claim 2
Dependent Claim
180 words
A liquid crystal display comprising first, second and third plates, each having front and rear surfaces, first spacer means separating the front surface of said first plate from the rear surface of said second plate and forming a chamber for a first type of liquid crystal material, second spacer means separating the front surface of said second plate from the rear surface of said third plate and Forming a second cell for a second type of liquid crystal material, shaped light transmitting electrodes on the surfaces of said second plate within each of said cells for selectively applying electric field across said liquid crystal material, a pair of oppositely disposed electrodes in each of said cells on said first and third plates, the liquid crystal material in the first of said cells having a nematic temperature range of approximately -20*C to 60*C and the liquid crystal material arranged in said second cell being of a type having a nematic range of approximately 60*C to 100*C whereby the temperature range of the display is extended to cover broad range temperature conditions.
Claim 3
Dependent Claim
35 words
A liquid crystal display as recited in claim 1 wherein said material in the first cell is a mixture of N-(p-methoxybenzylidene)-4-butylaniline (MBBA) and N-(p-hexyloxybenzylidene)-4-pentylaniline (HBPA) and the material in the second cell is (P-hexyloxybenzylidene)-4-methylcarbonatoaniline (HBMCA).
Claim 4
Dependent Claim
141 words
A LIQUID CRYSTAL DISPLAY COMPRISING MEANS SECURING A FIRST SECOND AND THIRD PLATE IN SPACED PARALLEL RELATION. SAID SECOND PLATE BEING OF LIGHT TRANSMITTING MATERIAL HAVING TRANSPARENT ELECTRODES OF OPPOSITE SURFACES, SAID FIRST PLATE BEING OF TRANSPATENT MATERIAL AND HAVING A TRANSPARENT ELECTRODE THEREON IN SPACED PARALLEL OPPOSED RELATION TO ONE OF THE ELECTRODES ON SAID SECOND PLATE, SAID THIRD PLATE HAVING AN ELECTRODE THEREON OF REFLECTIVE CONDUCTIVE MATERIAL, SAID FIRST, SECOND CELLS, AND PLATES TOGETHER DEFINING FIRST AND SECOND CELLS, SAID FIRST CELL BEING FILLED WITH A LIQUID CRYSTAL MATERIAL HAVING A FIRST LOW NEMATIC TEMPERATURE RANGE OF APPROXIMATELY -20*C TO 60*C AND THE SECOND CELL BEING FILLED WITH A LIQUID CRYSTAL MATERIAL HAVING A NEMATIC CHARACTERISTIC IN A SECOND HIGHER TEMPERATURE RANGE OF APPROXIMATELY 60*C TO 100*C THEREBY EXTENDING THE TEMPERATURE RANGE OF THE DISPLAY OVER NORMAL TEMPERATURE CONDITIONS.
Claim 5
Dependent Claim
141 words
A LIQUID CRYSTAL DISPLAY COMPRISING MEANS SECURING A FIRST SECOND AND THIRD PLATE IN SPACED PARALLEL RELATION. SAID SECOND PLATE BEING OF LIGHT TRANSMITTING MATERIAL HAVING TRANSPARENT ELECTRODES OF OPPOSITE SURFACES, SAID FIRST PLATE BEING OF TRANSPATENT MATERIAL AND HAVING A TRANSPARENT ELECTRODE THEREON IN SPACED PARALLEL OPPOSED RELATION TO ONE OF THE ELECTRODES ON SAID SECOND PLATE, SAID THIRD PLATE HAVING AN ELECTRODE THEREON OF REFLECTIVE CONDUCTIVE MATERIAL, SAID FIRST, SECOND CELLS, AND PLATES TOGETHER DEFINING FIRST AND SECOND CELLS, SAID FIRST CELL BEING FILLED WITH A LIQUID CRYSTAL MATERIAL HAVING A FIRST LOW NEMATIC TEMPERATURE RANGE OF APPROXIMATELY -20*C TO 60*C AND THE SECOND CELL BEING FILLED WITH A LIQUID CRYSTAL MATERIAL HAVING A NEMATIC CHARACTERISTIC IN A SECOND HIGHER TEMPERATURE RANGE OF APPROXIMATELY 60*C TO 100*C THEREBY EXTENDING THE TEMPERATURE RANGE OF THE DISPLAY OVER NORMAL TEMPERATURE CONDITIONS.
Claim 6
Dependent Claim
35 words
A liquid crystal display as recited in claim 3 wherein said material in the first cell is a mixture of N-(p-methoxybenzylidene-4-butylaniline (MEBA) and N-(p-hexyloxybenzylidene)-4-pentylaniline (HBPA) and the material in the second cell is (p-hexyloxybenzylidene)-4-methylcarbonatoaniline (HBMCA).
Claim 7
Dependent Claim
149 words
A liquid crystal display with an extended temperature range comprising a pair of serially aligned cells, one of said cells containing a liquid crystal material having a first low nematic temperature range of approximately -20*C to 60*C and the other of said cells containing a liquid crystal material having a high nematic temperature range of approximately 60*C to 100*C, said cells being defined by first, second and third plates secured together in spaced parallel relation, the second plate being a light transmitting plate having electrodes on opposite surfaces in contact with each of the liquid crystal materials, the first and third plates having electrodes on only one side in opposed relation to the electrodes on said second plate, the electrode of one of said first and third plates being of reflective material, while the electrode of the other of said first and third plates is of light transmitting material.
Claim 8
Dependent Claim
149 words
A liquid crystal display with an extended temperature range comprising a pair of serially aligned cells, one of said cells containing a liquid crystal material having a first low nematic temperature range of approximately -20*C to 60*C and the other of said cells containing a liquid crystal material having a high nematic temperature range of approximately 60*C to 100*C, said cells being defined by first, second and third plates secured together in spaced parallel relation, the second plate being a light transmitting plate having electrodes on opposite surfaces in contact with each of the liquid crystal materials, the first and third plates having electrodes on only one side in opposed relation to the electrodes on said second plate, the electrode of one of said first and third plates being of reflective material, while the electrode of the other of said first and third plates is of light transmitting material.
Claim 9
Dependent Claim
35 words
A liquid crystal display as recited in claim 5 wherein said material in the first cell is a mixture of N-(p-methoxybenzylidene)-4-butylaniline (MBBA) and N-(p-hexyloxybenzylidene)-4-pentylaniline (HBPA) and the material in the second cell is (p-hexyloxybenzylidene)-4-methylcarbonatoaniline HBMCA).
References Cited (Backward Citations)
US3675988A
Cited
US3645604A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |