Disclosure of Invention
In view of the above, the present invention provides a monolithic field sequential projection display system based on optical interference effect, which has the following technical scheme:
A monolithic field sequential projection display system based on optical interference effects, the monolithic field sequential projection display system comprising:
the laser source is used for emitting laser;
the shimming and shaping assembly is used for shimming and shaping the laser;
The light guide component is used for guiding the laser processed by the shimming shaping component into the display chip at a specific angle;
the display chip is used for modulating the brightness of the laser;
And the projection component is used for projecting the laser processed by the display chip onto a screen.
Preferably, in the monolithic field sequential projection display system, the laser source includes: a first color laser source, a second color laser source, and a third color laser source;
The first color laser source is used for emitting red laser;
The second color laser source is used for emitting green laser;
the third color laser source is used for emitting blue laser.
Preferably, in the monolithic field sequential projection display system, line widths of the first color laser source, the second color laser source and the third color laser source are all smaller than 2nm.
Preferably, in the monolithic field sequential projection display system, the shimming assembly includes: a first shim shaping unit, a second shim shaping unit, and a third shim shaping unit;
the first shimming and shaping unit is used for shimming and shaping the red laser;
The second shimming and shaping unit is used for shimming and shaping the green laser;
the third shimming and shaping unit is used for shimming and shaping the blue laser.
Preferably, in the monolithic field sequential projection display system, the light guide assembly includes: a first light guide unit and a second light guide unit;
the first light guide unit is used for guiding the red laser, the green laser and the blue laser into the display chip at different angles;
The display chip is used for carrying out brightness modulation on the red laser, the green laser and the blue laser, and the red laser, the green laser and the blue laser are collected by the projection component through the first light guide unit or the second light guide unit.
Preferably, in the monolithic field sequential projection display system, an incident angle of the red laser to the display chip is 0 ° -60 °;
The incidence angle of the green laser to the display chip is 0-60 degrees;
the incidence angle of the blue laser to the display chip is 0-60 degrees.
Preferably, in the monolithic field sequential projection display system, the display chip includes:
the first transparent substrate and the second transparent substrate are oppositely arranged;
a liquid crystal layer disposed between the first transparent substrate and the second transparent substrate;
A first alignment layer disposed between the first transparent substrate and the liquid crystal layer, and a second alignment layer disposed between the second transparent substrate and the liquid crystal layer;
A first conductive electrode disposed between the first transparent substrate and the first alignment layer, and a second conductive electrode disposed between the second transparent substrate and the second alignment layer;
a first dielectric film mirror disposed between the first conductive electrode and the first alignment layer, and a second dielectric film mirror disposed between the second conductive electrode and the second alignment layer.
Preferably, in the monolithic field sequential projection display system, the thickness of the liquid crystal layer is 100nm-900nm.
Preferably, in the monolithic field sequential projection display system, the refractive index of the liquid crystal layer ranges from 1.5 to 1.8.
Preferably, in the monolithic field sequential projection display system, the reflectivity of the first dielectric film mirror and the second dielectric film mirror ranges from 40% to 99%.
Compared with the prior art, the invention has the following beneficial effects:
The invention provides a monolithic field sequential projection display system based on optical interference effect, comprising: the laser source is used for emitting laser; the shimming and shaping assembly is used for shimming and shaping the laser; the light guide component is used for guiding the laser processed by the shimming shaping component into the display chip at a specific angle; the display chip is used for modulating the brightness of the laser; and the projection component is used for projecting the laser processed by the display chip onto a screen. The single-chip field sequential projection display system can realize single-chip color field sequential display by only adopting the cooperation of one display chip and other components, and has the advantages of high response speed, low power consumption, simple structure and low cost compared with the prior art.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Referring to fig. 1, fig. 1 is a schematic diagram of a monolithic field sequential projection display system based on optical interference effect according to an embodiment of the present invention, where a display chip is illustrated as a reflective type.
Referring to fig. 2, fig. 2 is a schematic diagram of another monolithic field sequential projection display system based on optical interference effect according to an embodiment of the present invention, where a display chip is illustrated by projection type.
The monolithic field sequential projection display system includes.
And the laser source 0 is used for emitting laser.
A shimming assembly 4, wherein the shimming assembly 4 is used for shimming and shaping the laser.
And the light guide assembly 5 is used for guiding the laser processed by the shimming assembly into the display chip 6 at a specific angle.
The display chip 6 is used for modulating the brightness of the laser.
And the projection assembly 7 is used for projecting the laser processed by the display chip 6 onto a screen 8.
In this embodiment, the laser source 0 includes: a first color laser source 1, a second color laser source 2 and a third color laser source 3.
The first color laser source 1 is used for emitting red laser light, and the optional wavelength of the first color laser source is 638nm.
The second color laser source 2 is used for emitting green laser, and the optional wavelength of the second color laser source is 520nm.
The third color laser source 3 is used for emitting blue laser, and the optional wavelength of the third color laser source is 465nm.
The linewidths of the first color laser source 1, the second color laser source 2 and the third color laser source 3 are all smaller than 2nm.
The shim shaping assembly 4 comprises: a first shim shaping unit 4.3, a second shim shaping unit 4.2 and a third shim shaping unit 4.1.
The first shimming unit 4.3 is used for shimming and shaping the red laser.
The second shimming unit 4.2 is configured to perform shimming and shaping on the green laser.
The third shimming unit 4.1 is configured to perform shimming and shaping on the blue laser.
The light guide assembly 5 includes: a first light guiding unit 5.1 and a second light guiding unit 5.2.
Wherein the first light guiding unit 5.1 is used for guiding the red laser light, the green laser light and the blue laser light into the display chip 6 at different angles.
The display chip 6 is configured to perform brightness modulation on the red laser, the green laser, and the blue laser, and collect the light passing through the first light guiding unit 5.1 or the second light guiding unit 5.2 by the projection assembly.
Optionally, the incidence angle of the red laser light on the display chip 6 is 0 ° -60 °.
The incidence angle of the green laser light to the display chip 6 is 0 ° -60 °.
The incidence angle of the blue laser light to the display chip 6 is 0 ° -60 °.
Specifically, as shown in fig. 1, when the display chip 6 is reflective, the display chip 6 is configured to perform brightness modulation on the red laser light, the green laser light, and the blue laser light, and the modulated red laser light, the modulated green laser light, and the modulated blue laser light are collected by the projection assembly 7 through the first light guiding unit 5.1.
Specifically, as shown in fig. 2, when the display chip 6 is transmissive, the display chip 6 is configured to perform brightness modulation on the red laser light, the green laser light, and the blue laser light, and the modulated red laser light, the modulated green laser light, and the modulated blue laser light are collected by the projection assembly 7 through the second light guiding unit 5.2.
Further, the following describes in detail the working procedure of a monolithic field sequential projection display system based on optical interference effect provided in the embodiment of the present invention:
Specifically, the red laser emitted by the first color laser source 1 is subjected to shimming and shaping by the first shimming unit 4.3, the green laser emitted by the second color laser source 2 is subjected to shimming and shaping by the second shimming unit 4.2, and the blue laser emitted by the third color laser source 3 is subjected to shimming and shaping by the third shimming unit 4.1.
As shown in fig. 1, the three-color lasers 1.1, 2.1 and 3.1 after being shimmed and shaped by the shimming and shaping component 4 are guided into the display chip 6 by the first light guiding unit 5.1 in the light guiding component 5 at different angles, and after being modulated by the display chip 6, the emergent lights 1.2, 2.2 and 3.2 after passing through the first light guiding unit 5.1 are collected by the projection component 7 and projected onto the screen 8, so as to realize large-screen projection display.
The second light guiding unit 5.2 is used for guiding out the transmitted unnecessary laser light from the display chip 6.
Or, as shown in fig. 2, the three-color lasers 1.1, 2.1 and 3.1 after being shimmed and shaped by the shimming shaping component 4 are guided into the display chip 6 by the first light guiding unit 5.1 in the light guiding component 5 at different angles, and after being modulated by the display chip 6, the emergent lights 1.2, 2.2 and 3.2 after passing through the second light guiding unit 5.2 are collected by the projection component 7 and projected onto the screen 8, so as to realize large-screen projection display.
The first light guide unit 5.1 is used for guiding out the transmitted unnecessary laser light to the display chip 6.
Optionally, the display chip 6 adjusts the refractive index of the liquid crystal layer inside the display chip by electric control based on the optical interference effect to change the reflectivity of the display chip to the three-color laser, thereby realizing the modulation of display brightness.
Optionally, in another embodiment of the present invention, referring to fig. 3, fig. 3 is a schematic structural diagram of a display chip according to an embodiment of the present invention.
The display chip 6 includes:
a first transparent substrate 6.1.1 and a second transparent substrate 6.1.2 arranged opposite to each other;
a liquid crystal layer 6.1.3 arranged between the first transparent substrate 6.1.1 and the second transparent substrate 6.1.2;
A first alignment layer 6.1.4 disposed between the first transparent substrate 6.1.1 and the liquid crystal layer 6.1.3, a second alignment layer 6.1.5 disposed between the second transparent substrate 6.1.2 and the liquid crystal layer 6.1.3;
A first conductive electrode 6.1.8 disposed between the first transparent substrate 6.1.1 and the first alignment layer 6.1.4, a second conductive electrode 6.1.9 disposed between the second transparent substrate 6.1.2 and the second alignment layer 6.1.5;
A first dielectric film mirror 6.1.6 disposed between the first conductive electrode 6.1.8 and the first alignment layer 6.1.4, and a second dielectric film mirror 6.1.7 disposed between the second conductive electrode 6.1.9 and the second alignment layer 6.1.5.
Optionally, the thickness of the liquid crystal layer 6.1.3 is 100nm-900nm.
Optionally, the refractive index of the liquid crystal layer 6.1.3 ranges from 1.5 to 1.8.
Optionally, the first dielectric film mirror 6.1.6 and the second dielectric film mirror 6.1.7 have a reflectivity in the range of 40% -99%.
In this embodiment, the liquid crystal layer 6.1.3 is located between the first transparent substrate 6.1.1 and the second transparent substrate 6.1.2 and is anchored by the first alignment layer 6.1.4 and the second alignment layer 6.1.5, and optionally, the materials of the first alignment layer 6.1.4 and the second alignment layer 6.1.5 include, but are not limited to, polyimide, and the alignment of the liquid crystal molecules in the first alignment layer 6.1.4 and the second alignment layer 6.1.5 is antiparallel.
In the embodiment of the invention, the response time of the liquid crystal in the display chip 6 is very short (sub-millisecond and microsecond), the display chip 6 respectively carries out brightness modulation on the laser with a certain color in a certain period of time through the control circuit, and the integration time of human eyes (about 30 ms) carries out time domain superposition to obtain the expected brightness and chromaticity so as to realize single-chip color field sequential display.
Specifically, a laser beam with a wavelength λ and a polarization direction P is guided into the display chip 6 by the light guide assembly 5, and is reflected and transmitted multiple times in the display chip 6, the energy of the incident beam is divided multiple times, the divided laser beams generate optical interference, and finally, the total energy of the incident beam is distributed in different proportions to the reflected light and the transmitted light of the display chip 6.
If the light source spectrum is an ideal linear spectrum, the light intensity reflectivity R and the light intensity transmissivity T of the display chip 6 can be expressed as:
Where r is the reflectivity of the first dielectric film mirror 6.1.6 and the second dielectric film mirror 6.1.7 in the display chip 6.
Delta = deltaPI+δLC＝4πnPIdPIcosθ/λ+4πndLC cos theta/lambda is the phase difference between the divided adjacent laser beams, which phase difference is jointly introduced by the first alignment layer 6.1.4, the second alignment layer 6.1.5 and the liquid crystal layer 6.1.3.
Wherein nPI is the refractive index of the first alignment layer 6.1.4 and the second alignment layer 6.1.5.
DPI is the total thickness of the first alignment layer 6.1.4 and the second alignment layer 6.1.5.
N is the refractive index of the liquid crystal layer 6.1.3.
DLC is the thickness of the liquid crystal layer 6.1.3.
Θ is the angle of incidence, i.e. the angle between the light and normal in the liquid crystal material.
When the incident light is incident into the liquid crystal at θ, the type of the liquid crystal material is E7, the extraordinary refractive index ne and the ordinary refractive index no are respectively ne＝1.7460,no = 1.5210, and since the alignment mode of the liquid crystal is antiparallel, the equivalent refractive index of the liquid crystal is:
Wherein, θLC is the angle between the long axis of the liquid crystal molecule and the polarization direction of light, and in the case of the "all-off" state of the display chip, there is θLC =θ according to the geometric relationship.
As is clear from the formula (1), the light intensity reflectance R and the light intensity transmittance T depend only on the phase difference for the same display chip 6. There is wavelength data for red, green and blue lasers: λr＝638nm,λg＝520nm,λb =465 nm, if the phase difference is to be ensured in the case of the three light sources in the "fully off" state, when the thickness dLC of the liquid crystal layer is fixed, there is:
From equation (2), a certain θLC ("incidence angle θ" in the fully-closed state) can be obtained to uniquely determine n, so that when the phase difference δ is constant, the corresponding red light "fully-closed" state liquid crystal equivalent refractive index nr_off can be obtained by a known red light incidence angle according to equation (2) and equation (3), and then the incidence angles θg、θb uniquely corresponding to green light and blue light, and the liquid crystal equivalent refractive index ng_off、nb_off can be obtained.
For the display chip, the three-color lasers are incident at different angles, and the emergent light needs to be collected by a projection lens with a proper caliber, so that the incidence angle difference of the three-color lasers needs to be as small as possible; second, an excessively large incident angle may place an excessively large demand on the size of the display chip.
Optionally, the thicknesses of the first alignment layer and the second alignment layer in the display chip are about 50nm, and refractive indexes of the first alignment layer and the second alignment layer are about nPI = 1.6250; if the display chip is in the "fully off" state when not driven for red light with λr =638 nm, the phase difference δ=2kpi, k being an integer, needs to be satisfied.
Since there are two alignment layers, namely a first alignment layer and a second alignment layer, dPI =2×50=100 nm.
The fast response of the liquid crystal is required for the in-situ display, and the relationship between the response time τ of the liquid crystal and the thickness dLC of the liquid crystal layer can be expressed as:
That is, the response time τ of the liquid crystal is proportional to the thickness dLC of the liquid crystal layer, and the thickness of the liquid crystal layer needs to be thin in order to shorten the response time of the liquid crystal.
Considering the limitation of the processing capability in the actual liquid crystal cell process, the thickness of the liquid crystal layer cannot be too small, and considering that the thickness of the liquid crystal layer is set to be around 500nm, δ=6pi is selected, and at this time, according to formula (1), the reflectance of the display chip can reach a minimum value, and thus can be used as the "all-off" state of display.
According to the conditions, through optimal design, the following parameters are selected:
The thickness of the liquid crystal layer is dLC =561 nm; for red light with lambdar =638 nm, the incident angle θr =30.0°, the "all-off" state liquid crystal equivalent refractive index nr_off = 1.6805; for green light with lambdag =520 nm, the incident angle θg =43.5°, the "fully off" state liquid crystal equivalent refractive index ng_off = 1.6278; for blue light with lambdab =465 nm, the incident angle θb =49.0°, and the "fully off" state liquid crystal equivalent refractive index nb_off = 1.6067.
In this embodiment, the thickness of the liquid crystal layer of the display chip is 561nm, which is about 1/5.3 of the conventional LCOS display (thickness of the liquid crystal layer is about 3 μm), and the response time of the display chip is about 1/28 of the conventional LCOS display according to the formula (4).
The response time of a typical LCOS display is about 10ms, and the response time of the display chip can reach about 0.36ms theoretically, so that the quick response time can obviously improve the refresh rate of the display chip and completely meet the requirement of single-chip field sequential display.
For the ultrathin liquid crystal layer with the nanometer thickness, the birefringence of the liquid crystal is reduced due to the anchoring action of the first alignment layer and the second alignment layer, specifically:
When a P-polarized light beam is perpendicularly incident on the liquid crystal layer, the maximum refractive index modulation amount of the liquid crystal can be expressed as:
Δn⊥＝(ne-no)(1-2d*/dLC) (5)
Wherein d* is a dummy layer, and represents the thickness of the liquid crystal inactive layer on the surface of the alignment layer, which is determined by the boundary effect between the liquid crystal and the surface of the alignment layer.
For E7 type liquid crystal, d=190 nm.
The maximum refractive index modulation amount Δn⊥ =0.0726 of the liquid crystal can be obtained according to formula (5).
Therefore, for anti-parallel aligned liquid crystals, when P polarized light is perpendicularly incident, the liquid crystal equivalent refractive index can be as low as n⊥min＝ne-Δn⊥ = 1.7460-0.0726= 1.6734.
As can be appreciated by bringing the equivalent refractive index value into formula (2), at normal incidence, the angle θ⊥LC =31.9° between the long axis of the liquid crystal molecules and the polarization direction of light, i.e., when the liquid crystal is driven with a saturation driving voltage at a thickness of 561nm, the equivalent director can be rotated by 31.9 ° at most.
In the embodiment of the invention, the display chip is used for simulating the rapid brightness modulation of the laser, namely, the display brightness of the display chip is adjusted by controlling the voltage applied to the display chip.
The reflection lines of the display chip determine the gray scale and the maximum contrast that can occur in the display, and when the thickness dLC of the liquid crystal layer is determined, the reflectivity r of the first dielectric film mirror and the second dielectric film mirror is the only factor affecting the gray scale and the maximum contrast.
When r is too large, the modulation area of the spectral line changes drastically, which can lead to an increase in reflectivity in the "full on" state, an increase in maximum contrast, but less gray scale; conversely, when r is too small, the modulation region of the spectral line changes slowly, the reflectivity in the "fully on" state is small, the maximum contrast is reduced, but the gray scale is large.
Therefore, for the choice of the reflectivity r of the first dielectric film mirror and the second dielectric film mirror, it is necessary to have the modulation line in the linear region to have a compromise between maximum contrast and gray scale.
Optionally, in the embodiment of the present invention, the reflectivity r=0.75 of the first dielectric film mirror and the second dielectric film mirror is selected, so that the modulation area of the display chip is in a linear area, and a higher contrast ratio and a higher gray scale are achieved.
Referring to fig. 4, fig. 4 is a schematic diagram of reflection lines of red light in "full on" and "full off" states, and also shows states of liquid crystal molecules in "full on" and "full off" states according to an embodiment of the present invention.
As shown in fig. 4, when red light is incident at θr =30.0°, in the case of the "all-off" state, the equivalent refractive index of the liquid crystal molecule is nr_off = 1.6805, which is shown as a dark state, and the reflectance of the display chip is Rr_min＝1.5703×10-4; in the case of the "fully on" state, the equivalent refractive index of the liquid crystal molecules is nr_on = 1.5634, the display is in the bright state, and the reflectivity of the display chip is Rr_max = 0.9309; when the driving voltage is between voltages corresponding to the "full on" and "full off" states, it is displayed as an intermediate brightness.
Referring to fig. 5, fig. 5 is a schematic diagram showing the reflection spectrum of green light in the "full on" and "full off" states, and showing the state of liquid crystal molecules in the "full on" and "full off" states.
As shown in fig. 5, when green light is incident at θg =43.5°, in the case of the "all-off" state, the equivalent refractive index of the liquid crystal molecule is ng_off = 1.6278, which is shown as a dark state, and the reflectance of the display chip is Rg_min＝5.5764×10-4; in the case of the "fully on" state, the equivalent refractive index of the liquid crystal molecules is ng_on = 1.5328, the display is in the bright state, and the reflectivity of the display chip is Rg_max = 0.9057; when the driving voltage is between voltages corresponding to the "full on" and "full off" states, it is displayed as an intermediate brightness.
Referring to fig. 6, fig. 6 is a schematic diagram of a reflection spectrum line of blue light in "full on" and "full off" states, and also shows a state of a liquid crystal molecule in "full on" and "full off" states according to an embodiment of the present invention.
As shown in fig. 6, when blue light is incident at θb =49.0°, in the case of the "fully off" state, the equivalent refractive index of the liquid crystal molecule is nb_off = 1.6067, which is shown as a dark state, and the reflectance of the display chip is Rb_min＝1.8039×10-3; in the case of the "fully on" state, the equivalent refractive index of the liquid crystal molecules is nb_on = 1.5256, the display is in the bright state, and the reflectivity of the display chip is Rb_max = 0.8433; when the driving voltage is between voltages corresponding to the "full on" and "full off" states, it is displayed as an intermediate brightness.
The control circuit is used for controlling the light-emitting time of the three-color laser and combining the rapid brightness modulation of the display chip to the three-color laser, so that the single-chip color field sequence display can be realized.
Specific:
In a first time t1, the first color laser source is turned on to emit red laser, the second color laser source and the third color laser source are turned off, the display chip carries out brightness modulation on the red laser in an analog working mode, and the display brightness is Ir.
In a second time t2, the second color laser source is turned on to emit green laser, the first color laser source and the third color laser source are turned off, the display chip carries out brightness modulation on the green laser in an analog working mode, and the display brightness is Ig.
In a third time t3, the third color laser source is turned on to emit blue laser, the first color laser source and the second color laser source are turned off, the display chip carries out brightness modulation on the blue laser in an analog working mode, and the display brightness is Ib.
The red laser, the green laser and the blue laser are respectively modulated into specific brightness by the display chip in respective working time, and time domain superposition is carried out in the integration time (about 30 ms) of human eyes, so that expected brightness and chromaticity can be obtained, and field sequential color display is realized.
Optionally, in another embodiment of the present invention, the fast brightness modulation of the display chip on the red laser, the green laser and the blue laser is a digital operation mode, and the voltage applied to the display chip is a voltage corresponding to a "full off" state and a voltage corresponding to a "full on" state, so as to change the brightness of the display chip by adjusting the time proportion of the display chip in the "full on" state and the "full off" state.
Specific:
In a first time t1, the first color laser source is turned on to emit red laser, the second color laser source and the third color laser source are turned off, the display chip carries out brightness modulation on the red laser in a digital working mode, and the red display brightness is Ir by adjusting the time proportion between the red 'full-off' state and the red 'full-on' state of the display chip.
In a second time t2, the second color laser source is turned on to emit green laser, the first color laser source and the third color laser source are turned off, the display chip carries out brightness modulation on the green laser in a digital working mode, and the green display brightness is Ig by adjusting the time proportion between the green 'full-off' state and the green 'full-on' state of the display chip.
In a third time t3, the third color laser source is turned on to emit blue laser, the first color laser source and the second color laser source are turned off, the display chip carries out brightness modulation on the blue laser in a digital working mode, and the blue display brightness is Ib by adjusting the time proportion between the blue 'full-off' state and the blue 'full-on' state of the display chip.
The red laser, the green laser and the blue laser are respectively modulated into specific brightness by the display chip in respective working time, and time domain superposition is carried out in the integration time (about 30 ms) of human eyes, so that expected brightness and chromaticity can be obtained, and field sequential color display is realized.
As can be seen from the above description, the display chip has appropriate "full on" and "full off" state transmittance for three-color light by selecting appropriate equivalent refractive index of the liquid crystal layer for three-color laser by appropriate voltage driving, regardless of whether it is a single-chip field sequential projection display system of a reflective display chip or a single-chip field sequential projection display system of a transmissive display chip. The control circuit is used for enabling the display chip to respectively carry out brightness modulation on laser with a certain color in a certain period of time in an analog or digital working mode, and the laser is overlapped in the time domain of the integration time (about 30 ms) of human eyes, so that expected brightness and chromaticity can be obtained, and single-chip color field sequential display is realized.
The foregoing has outlined a detailed description of a monolithic field sequential projection display system based on optical interference effects, wherein specific examples are provided herein to illustrate the principles and embodiments of the present invention, and the above examples are provided to assist in understanding the method and core concepts of the present invention; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present invention, the present description should not be construed as limiting the present invention in view of the above.
It should be noted that, in the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described as different from other embodiments, and identical and similar parts between the embodiments are all enough to be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
It is further noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include, or is intended to include, elements inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.