The invention relates to grating light valve devices. More particularly, the present invention relates to grating light valve devices with an asymmetric configuration of movable ribbons for optimizing diffraction conditions.
Recent developments in the miniaturization of various electro-mechanical devices, also known as micro machines, has led to the emergence of miniature diffraction gratings. One type of miniature diffraction grating is a grating light valve. A grating light valve is a device that is capable of alternating between the conditions for constructive and destructive interference with an incident light source λ to modulate the reflected light source between a minimum and maximum intensity value, preferably in a stepwise fashion. Grating light valves have applications in display, print, optical and electrical device technologies. Examples of a grating light valves and their uses are disclosed in the U.S. Pat. No. 5,311,360, issued to Bloom et al., which is hereby incorporated by reference.
Referring to
By applying an appropriate bias voltages across the ribbons 100 and the substrate 102, a portion of the ribbons 100 move towards and contact the substrate 102, as shown in
There have been several advances in grating light valve devices both in the fabrication processes and in design. For example, flat diffraction grating light valves and their advantages are described in the U.S. Pat. No. 5,841,579 and the U.S. Pat. No. 5,808,797, both issued to Bloom et al., the contents of which are incorporated by reference.
Referring to
In one mode of operation, light is modulated by moving one set of alternating ribbons relative to a stationary set of alternating ribbons. The ribbons that are moved are referred to as the active ribbons and the stationary ribbons are referred to as the bias ribbons. The active ribbons are moved by any number of means including mechanical means, but are preferably moved by applying a sufficient bias voltage across the active ribbon and the substrate created Coulombic attractions and/or repulsions between the the active ribbons and the substrate.
Now referring to
While current designs of grating light valves have improved their operating efficiency and reliability, there is continued need to further optimized of grating light valve devices for use in display, print, optical and electrical device technologies.
In accordance with the instant invention a grating light valve has a diffraction cross section that is capable of interfering constructively and destructively with an incident light source having a wavelength λ. The grating light valve of the instant invention is configured to operated with any number of light sources, but is most useful for diffracting incident light sources with wavelengths between 300 and 3000 nanometers. The grating light valve preferably has a plurality of movable ribbons each coated with a reflective layer.
The plurality of moveable ribbons are comprised of at least two of sets of alternating ribbons. The ribbon in the first set have average widths Wa that are preferably 1 to 6 microns in the diffraction region of the device. The ribbons in the second set have average widths Wb that are preferably 0.5 to 5 microns in that diffraction region of the device. The ribbons of the first set and the ribbons of the second set are uniformly separated by an average width Ws of 0.5 to 2.0 microns in the diffraction region of the device.
The ribbons are suspended over reflective regions of a substrate element. The reflective regions of the substrate correspond to the spaces Ws between the alternating ribbons. In the constrictive interference position the reflective surface of the of ribbons are preferably in the same reflective plane and separated from the reflective regions of the substrate by a distance approximately equal to a multiple of λ/2 such that the compliment of reflective surface including the reflective regions of the substrate act as a mirror.
The diffraction efficiency and the contrast of the grating light device is improved by configuring the device to generate amplitudes of reflected light from the first set of ribbons that is substantially equal to the sum of the amplitudes of the reflected light from the second set of ribbons and the reflective light from the reflective regions of the substrate. Preferably, the amplitude matching is accomplished by making Wa equal to the sum of a with Wb and Ws within the diffraction region of the grating light valve and by providing the ribbons and the reflective regions of the substrate between the ribbons with the same reflective surfaces. Accordingly, in the destructive interference position, the compliment of reflective surfaces maximize cancellation of the reflected light and, hence, maximize the contrast of the grating light valve.
In operation, the first set of ribbons is moved by a distance equal to a multiple of λ/4 in order to switch between the conditions for constructive and destructive interference. Preferably, the first set of ribbons is move towards the reference surface of the substrate by applying a sufficient bias voltage across the first set of ribbons and the substrate element. Alternatively, both the first set and the second set of ribbons are move in opposite directions relative to the reference surface of the substrate to switch between the conditions for constructive and destructive interference.
a-b are cross sectional representations of a grating light valve with a reflective ribbons that are movable relative to the reflective surfaces of a substrate to alternated between the conditions for constructively and destructively interfere with an incident light source having a wavelength λ.
a-b are cross sectional representations of a flat diffraction grating light valve with two sets of alternating reflective ribbons that are movable relative to each other to alternate between the conditions for constructively and distractively interfere with an incident light source having a wavelength λ.
Flat diffraction grating light valves, described above, which have at least two sets of movable ribbons are preferably over a single set of movable ribbons, for performance and manufacturing reasons that are detailed in the U.S. Pat. No. 5,841,579. While the flat diffraction grating light valve is preferred, there are still several short comings that must be overcome to optimize the contrast and efficiency of the device.
One inefficiency in a flat grating light valve arises because of the spaces between the alternating active and bias ribbons. The spaces between the alternating active and bias ribbons are required because of manufacturing tolerances and for operation tolerances that allow the active ribbons move relative to the bias ribbons. As a result, a considerable portion of the incident light passes between the ribbons and impinges the regions of the substrate corresponding to the spaces. If these regions of the substrate surface are not properly construction to reflect the incident light source or are not properly phase matched with the active and the bias ribbons, then the maximum efficiency of the device is not achieved and the maximum contrast will not be observed.
In other words to optimize the contrast and efficiency of a light grating valve, light that is reflected from interference surfaces within the diffraction region of a grating light valve must be completely in phase for constructive interference and completely out of phase for destructive interference. Further, the interfering light reflected from the surfaces that are interfering must have the same amplitude to achieve total cancellation of the light.
Thus to improve the efficiency of the light grating device and to optimized the contrast of the modulated light, the instant invention provides for reflective surfaces on the substrate in the regions corresponding to the spaces between the alternating ribbons which are matched to the bias and active ribbons. Preferably this is accomplished by providing reflective surfaces on the ribbons and on the regions of the substrate between the ribbons which have the same reflectivity. This goal is further accomplished by providing an asymmetric ribbon configuration such that the reflective surface area of interfering surfaces are matched.
According to the previous flat grating light valve designs, the widths Wb of the bias ribbons 401 and the widths Wa of the active ribbons are approximately the same, within manufacturing tolerances of ±10%. In operation the active ribbons 402 are moved toward the substrates 400 by a distance that is equal to a multiple of λ/2 such that the portions of the incident light Eb that are reflected from the bias ribbons 401 and the portions of the incident light Ea that are reflected from the active ribbons 402 are out of phase 403 and destructively interfere. In this case, even if Eb and Eb completely cancel the total light that is reflected will still include a contribution from Es and, therefore, the contrast is not optimized.
In order to optimized the condition for destructive interference and, therefore, optimize the contrast of the grating light valve, the grating light valve of the instant invention utilizes ribbons that exhibit asymmetric reflection amplitudes. Preferably, the ribbons are configured such that the amplitude of the incident light that is reflected by the set of active ribbons is substantially matched to the amplitude of incident light that is reflected by the sum of the set of bias ribbons and reflective regions of the substrate. Preferably, all of the reflective surfaces have approximately the same reflectivity and the active ribbons have a reflective surface areas that are approximately equal to the sum of the reflective surface areas of the bias ribbons and the reflective regions of the substrate.
The ribbons are preferably elongated and rectangular-like in shape. Further, the ribbons are preferably uniformly spaced. Accordingly, the asymmetric reflectivity of the ribbons is preferably achieved by making the average width Wa each of the active ribbons greater than the average width Wb each of the basis ribbons such that the sum of Wb and the spaces Ws between each of the alternating active and bias ribbons is approximable equal to Wa. Most preferably, the widths of the active ribbons Wa are made to be 1 unit wider than the widths Wb of the bias ribbons and, therefore, the widths Ws of the spaces between the alternating active and bias ribbons is approximately equal tol unit.
In operation the ribbon of the reflective elements 601 and 602 are substantial co-planar and suspended above the reflective regions 607 of the substrate 603 by a distance equal to a multiple of λ/2 to achieve the condition for constructive interference and maximum brightness. To achieve the condition for destructive interference, the ribbons of the reflective element 601 are moved toward the substrate by a distance that is equal to λ/4, as described in detail above.
The present invention has been described in terms of specific embodiments incorporating details to facilitate the understanding of the principles of construction and operation of the invention. Such references, herein, to specific embodiments and details thereof are not intended to limit the scope of the claims appended hereto. It will be apparent to those skilled in the art that modifications can be made in the embodiment chosen for illustration without departing from the spirit and scope of the invention.
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