摘要:
In a reflective mode FLC application, a ¼-wave plate compensating FLC is used in series with a ¼-wave imaging FLC to compensate for the effects of DC balancing. Alternatively, the compensating wave plate could be any odd ¼-wave multiple, such as 3&lgr;/4, 5&lgr;/4, etc. The FLCs are driven in synchronization between on and off states with the total effective retardation for each FLC being either none or one-half wavelength in a double pass.
摘要:
In a reflective mode FLC application, a ¼-wave plate compensating FLC is used in series with a ¼-wave imaging FLC to compensate for the effects of DC balancing. Alternatively, the compensating wave plate could be any odd ¼-wave multiple, such as 3&lgr;/4, 5&lgr;/4, etc. The FLCs are driven in synchronization between on and off states with the total effective retardation for each FLC being either none or one-half wavelength in a double pass.
摘要:
An electro-optic shutter is provided that includes first and second liquid crystal devices located along an optical path and first and second color-selective layers located between the first and second liquid crystal devices. Each liquid crystal device is adapted to rotate the polarization of incident light to a substantially orthogonal polarization in response to being in a first state, and to not substantially change the polarization of incident light in response to being in a second state. The first color-selective layer is adapted to transmit first and second colors and a first polarization of a third color. The second color-selective layer is adapted to transmit the first and the third colors and a second polarization of the second color that is substantially orthogonal to the first polarization. An electro-optic shutter is also provided that includes a color-selective layer, a liquid crystal device to receive light from the color-selective layer and a polarizer to receive light from the liquid crystal layer. The color-selective layer is adapted to transmit a first color, a first polarization of a second color, and a substantially orthogonal polarization of a third color. The liquid crystal device is adapted to rotate the polarization of light to a substantially orthogonal polarization when in a first state and to not substantially rotate the polarization of light when in a second state. The electro-optic shutter can be employed in projection systems.
摘要:
An image processing system processes light conveying visual pattern information represented by individual light rays. The system includes an optical assembly having an input surface and an output surface. The input and output surfaces define a plurality of input and output positions, respectively, for the light rays to enter and exit, respectively, the assembly. The assembly includes a light-shifting apparatus operable so that a respective one of the light rays entering a respective one of the input positions is selectively shiftable by the apparatus in a first direction and, subsequently, in a second direction angled with respect to the first direction from a preceding one to another of the output positions. The assembly is further operable so that following each shifting operation, a respective one of the light rays transmitted by the assembly from an arbitrarily selected one of the output positions is solely derived from the light received from a single one of the input positions.
摘要:
A light separator (20) for testing the tilt angles of mirror elements (21) of a digital micro-mirror device. The light separator (20) is comprised of two triangular prisms (23, 25). A bottom prism (23) receives light from all mirror elements (21). It transmits light from all mirror elements having a tilt angle over a specified angle (21a, 21b) from a different face than light from mirror elements having a tilt angle less than the specified angle (21c). A top prism (25) receives light from one face of the bottom prism (23). It further divides the light, so that light from all mirror elements having a tilt angle within a specified range (21a) is transmitted from one face and light from other mirror elements (21b) is transmitted from another face.
摘要:
A spatial light modulator with an anti-reflective coating (ARC) 100 integrated into its structure. The manufacturing of the device is altered to include deposition of an ARC 100, and any necessary patterning and etching to allow the elements of the array to operate properly. The ARC could reside in several places of the element structure including over the addressing circuitry 26, over a middle layer 32 or on the underside of the reflective structure 10. Micromechanical spatial light modulators, as well as non-moving modulators, such as reflective and transmissive LCD modulators can use the invention.
摘要:
A color-separating prism includes first, second, and third component prisms that form first and second adjacent pairs of faces and include nonadjacent faces. The third component prism has a front surface or face. The color-separating prism includes a first reflective layer disposed in part between the first adjacent pair of faces and in part on one nonadjacent face and a second reflective layer disposed in part between the second adjacent pair of faces and in part on another nonadjacent face. The first and second reflective layers are inclined to reflect portions of light incident on the front surface back toward the front surface for total internal reflection. The color-separating may be used to produce narrow-spectral light from broader spectral light. A first portion of a light beam substantially in a first wavelength range is reflected from the first reflective layer back toward the front face of the prism. A second portion of the light beam substantially in a second wavelength range is reflected from the second reflective layer back toward the front face of the prism. The first and second portions are totally internally reflected from the front face. The color-separating prism can be used in display systems.
摘要:
A color image display system (10, 110, 120, 150) having a lamp power supply (78, 134, 152) switching rate being a multiple of, and synchronized to, a video frame rate. An AC component of a lamp driving waveform which may cause variations in intensity of the lamp output is synchronized to the video frame rate. Synchronizing the lamp power supply switching rate to the frame rate stops the beating and rolling of color bands in the video frame that may be produced by a ripple in light intensity. An odd number of switching cycles per two frame periods is chosen to alternate the phase of the ripple pattern frame-to-frame for ripple cancellation through integration. The lamp driving waveform may be amplitude modulated (90) to balance a lamp (14) that has spectral deficiencies. A DMD spatial light modulator (26) is utilized to modulate the colored light and generate a light image on a display (42) in either a sequential, or non-sequential image display system.
摘要:
A method of adjusting color temperature of images displayed by a display system (10) whose images are based on sequential pixel data and are filtered with a color wheel (15, 15', 15"). The relative display times for each color are adjusted to result in a corresponding adjustment of color temperature. In a first embodiment (FIG. 2), the size of the color wheel's segments are changed as well as the display times for data corresponding to each segment. In a second embodiment (FIG. 3), the display times for data corresponding to one or more segments are decreased with a black display time to fill in the difference.