EP0432831A2
Expired / Lapsed
EP
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Double cell liquid crystal display with composite structure and display device incorporating same
Assignee: Koninklijke Philips NV
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Filing: 1990-12-03
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Granted: —
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Expires: 2010-12-03
Abstract
Abstract A double cell active matrix thin film transistor switched liquid crystal display (10) in which the twist directions of the two cells is opposite, has a common central wall of a quartz substrate (11) carrying the thin film transistor array (12) on one surface, flanked on either side by outer cell wall of glass (15,16). The symmetry of the structure cancels stresses induced by the thermal expansion mismatch between the quartz and the glass, enabling use of the cheaper glass material for the outer cell walls, as well as close thermal coupling between the two cells, facilitating the ability of the double cell structure to compensate for thermally induced changes in optical anisotropy.
Inventors
- 👤 Edward Henry Stupp
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-06 14:19
CPC Classifications
H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1347
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
123 words
A double cell active matrix thin film transistor switched liquid crystal display, each cell comprising a pair of opposed optically transparent cell walls, a liquid crystal material filling the space between the walls, and an orienting layer on the inner surface of each wall in contact with the liquid crystal material, the inner surface of one of the walls of one of the cells containing a thin film transistor array, characterized by a composite structure in which the cell wall containing the thin film transistor array consists of a single substrate of a first optically transparent material, the substrate serving as a common inner wall for both cells, and the outer walls both consist of a substrate of a second optically transparent material.
Claim 2
Dependent Claim
18 words
The LCD of Claim 1 in which the first material is quartz and the second material is glass.
Claim 3
Dependent Claim
17 words
The LCD of Claim 1 in which the twist directions in the cells are opposite each other.
Claim 4
Dependent Claim
23 words
The liquid crystal display of Claim 1 in which the thickness of the liquid crystal region of each cell are substantially the same.
Claim 5
Dependent Claim
20 words
The liquid crystal display of Claim 1 in which the cells are sealed around their periphery with a curable adhesive.
Claim 6
Dependent Claim
15 words
The liquid crystal display of Claim 5 in which the adhesive is an epoxy resin.
Claim 7
Dependent Claim
19 words
The liquid crystal display of Claim 2 in which the thickness of the quartz substrate is less than 1mm.
Claim 8
Dependent Claim
33 words
The liquid crystal display of Claim 1 in which the first material is glass and the second material is glass having a different coefficient of thermal expansion than that of the first material.
Claim 9
Dependent Claim
126 words
A display device including at least one double cell active matrix thin film transistor switched liquid crystal display in which each cell comprises a pair of opposed optically transparent cell walls, a liquid crystal material filling the space between the walls, and orienting layers on the inner surfaces of the walls in contact with the liquid crystal material, the inner surface of one of the walls of one of the cells containing a thin film transistor array, characterized by a composite structure in which the cell wall containing the thin film transistor array consists of a substrate of a first material, the substrate serving as a common inner wall for both cells, and the outer cell walls both consist of a substrate of a second material.
Claim 10
Dependent Claim
56 words
The display device of Claim 9 which comprises a projection television display device including means for creating separate red, blue and green monochrome components of a color image on three liquid crystal displays, a projection screen, and means for superimposing the separate components of the image onto the screen, whereby a full color display is realized.
Claim 11
Dependent Claim
21 words
The display device of Claim 9 in which all three of the liquid crystal displays comprise a double cell composite structure.
References Cited (Backward Citations)
No citation records indexed.
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