Abstract:
A microdisplay (44) having interface circuitry (116) on the same silicon backplane (70) to allow it to receive digital images and video in a variety of formats and convert same to field sequential color signals for generation of full color images. It includes column data processors having a comparator for each block of N-columns of pixels (82). Image data is double-buffered in SRAM (92) memory cells located beneath the pixel electrodes, but not within each pixel. The stored data is logically associated with each pixel via the column data processors. Image compression is accomplished by converting RGB data to a variant of YUV data and sampling the color components of the converted data less frequently than the luminance components. The SRAM image buffer consumes a reduced amount of power. A temperature compensation scheme allows the temperature of the microdisplay to be sensed and the drive voltage to the pixel electrodes to be varied in response thereto.
Abstract:
The subject application discloses chiral nonracemic compositions of the general formula R1-(Ar)-O-C*H(CH3)-C*HX-C*HY-R2, wherein: R1 is an achiral tail of two to sixteen carbons; Ar is an achiral FLC core of at least two rings; * denotes a chiral or potentially chiral carbon; X is a halide and Y is H or a halide; R2 comprises the distal segment of the chiral tail and has one to ten carbon atoms; the -O-C*H(CH3)-C*HX-C*HY segment comprises the chiral proximal segment of the chiral tail, and the proximal segment is selected from the diastereomers and enantiomers (I).
Abstract:
A display system that achieves a gamma characteristic different than 1, such as a gamma characteristic of 2 for example. The gamma characteristic may be selectable and it may be selectable via timing characteristics rather than by varying the intensity of the light source. Defective memory registers are also compensated for by selecting them to store bits of relatively lower significance.
Abstract:
The subject application discloses a chiral nonracemic composition of the general formula: R1-Ar-O-CH2-C*HX-C*HY-CH2-O-R2, wherein R1 is a tail group of two to sixteen carbons; Ar is an achiral FLC core of at least two rings; * denotes a chiral carbon; X and Y are halogens; and R2 is one to ten carbon atoms. The -O-CH2-C*HX-C*HY-CH2-O- segment comprises the chiral proximal segment of the chiral tail; the proximal segment is selected from the enantiomers 2R,3R-dihalo and 2S,3S-dihalo. R2 is the distal segment of the chiral tail.
Abstract:
Provided are additive liquid crystalline compounds that, when added to one or more other components, form a mixture which can be supercooled. One class of additive liquid crystalline compounds are silyl-containing liquid crystalline compounds. Also provided are devices incorporating one or more silyl-containing liquid crystalline compound described herein and optionally one or more other components. The invention also includes the method of using liquid crystalline mixtures containing silyl-containing liquid crystalline compounds to suppress the crystallization, in a liquid crystal cell, of these mixtures at temperatures below their crystallization point.
Abstract:
A multi-state light modulating system (70) having grayscale based on a series of time intervals includes an arrangement that establishes (200) the duration of each time interval such that the time intervals in the series have progressively varying duration. The arrangement also determines a drive signal for each time interval that causes the light modulator to assume a specific light modulating state. The arrangement also causes the light modulator to produce a desired time-averaged light level over the series of time intervals by in part driving (214) the light modulator using the drive signal that corresponds to a particular time inverval for a duration that is longer (212) than the duration of the time interval. The arrangement also or alternatively arranges (210) the series of time intervals such that the light modulator is in the same state immediately prior to the particular time interval as the lights modulator is in immediately after the time interval.
Abstract:
This invention provides compounds of formula R1-Ar-R2 wherein R1 and R2, independently of one another, are selected from the group consisting of alkyl, cycloalkyl, alkenyl, cycloalkenyl, alkynyl, alkoxy, thioalkyl, thioether and ether groups having from 1 to about 20 carbon atoms, wherein one or more -CH2- groups in R1 and R2 may be independently replaced with a member of the group consisting of O, S, -CH2O-, -OCH2-, -COO-, -OOC-, -CH2S-, -SCH2-, -COS-, -SCO-, a double bond, a triple bond, and an alkyl silyl group, Si(Re)(Rf), in which Re and Rf, independently of one another, are small akyl or alkenyl groups having from about 1 to about 8 carbon atoms, said R1 or R2, independently of one another, can be partially or fully halogenated, and said R1 or R2, independently of one another , can be internally or terminally branched; Ar is a ring core moiety of general formula (I) wherein Cyc is a cyclohexyl ring or a cyclohexenyl ring, which may be optionally substituted with members selected from the group consisting of halogen atoms, methyl groups, trifluoromethyl groups, cyano groups, methoxy groups, and trifluoromethoxy groups; RX, RY and RZ, independently of one another, are aromatic or non-aromatic rings which are selected from the group consisting of 1,4-phenyl, 2,5-pyridinyl, 2,5-pyrimidinyl, 2,5-pyrazinyl, 3,6-pyridazinyl, 2,5-dithiazolyl, 1,4-cyclohexyl, 1-4-cyclohex-2-enyl, and 1,4-cyclohexenyl rings, wherein any hydrogen in RX, RY and RZ may optionally be substituted with a halogen atom; wherein x, y, z are, independently of one another, 0, 1, or 2 such that x+y+z=1, 2, or 3; wherein A, B and D, independently of one another, are linkers selected from the group -(CH2)w-, wherein w is 0 to about 8, and wherein one or more -CH2- groups in A, B or D may be independently replaced with a member selected from the group consisting of O, S, -CH2O-, -OCH2-, -COO-, -OOC-, -CH2S-, -SCH2-, -COS-, -SCO-, a double bond, a triple bond, and an alkyl silyl group, Si(Re)(Rf), in which Re and Rf, independently of one another, are small alkyl or alkenyl groups having from about 1 to about 8 carbon atoms; wherein a, b, d, independently of one another, are 0 or 1, such that a+b+d=1,2,or 3.
Abstract:
A display system (400) for acting on light entering the system includes a reflective ferroelectric liquid crystal spatial light modulator (402) and a polarizer arrangement. The polarizer arrangement includes a polarizer (405) for polarizing the light entering the system and directing the polarized light into the spatial light modulator (SLM) along an optical path having an optical path axis, an analyser (406) configured to receive and analyze the optical output of the SLM (402) and to direct the analyzed optical output out of the system, a compensator (404) between the polarizer (405) and the SLM (402) and in the optical path between the SLM (402) and the analyzer (406) and a passive wave plate (408) in the optical path between the light source (410) and the SLM and in the optical path between the SLM and the viewing area. The compensator includes a layer of ferroelectric liquid crystal light modulating medium switchable between a first compensator state and a second compensator state.
Abstract:
The subject application discloses chiral nonracemic compositions of general formula (I), wherein R1 is an achiral tail of two to sixteen carbons; Ar is an achiral FLC core of at least two rings; * denotes a chiral or potentially chiral carbon; Q is H or a methyl group; X and Z are halides and Y is H or a halide; and R2 is one to ten carbon atoms. The -O-C*HQ-C*HX-C*HY- segment comprises the chiral proximal segment of the chiral tail. Z can be an ortho halide alone, or ortho and meta halides on adjacent carbons on the aromatic ring of the core adjacent to the proximal segment. R2 is the distal sement of the chiral tail. The proximal segment is selected from the diastereomers and enantiomers: (II).