Patent Publication Number: US-2011063574-A1

Title: Three-Dimensional Display Using an Invisible Wavelength Light Source

Description:
BACKGROUND 
     One of the most common approaches to displaying three-dimensional (3D) video is based on stereo vision. In stereo vision 3D, two different images each from a slightly different perspective are presented, one to each of the viewer&#39;s eye. Such a 3D system involves projecting two different images and presenting each eye with only one of the images. One approach to providing each eye with one of the images is four-color 3D in which one eye is presented with a full color image comprising three colors and the other eye is presented with a monochrome image comprising a fourth color. The monochrome color typically is selected to have a wavelength in the region of higher eye sensitivity, referred to as the photopic response, for example yellow. However, for a lower power laser based system having generally smaller form factors, utilizing a yellow laser to implement a four-color 3D system may not be practical. 
    
    
     
       DESCRIPTION OF THE DRAWING FIGURES 
       Claimed subject matter is particularly pointed out and distinctly claimed in the concluding portion of the specification. However, such subject matter may be understood by reference to the following detailed description when read with the accompanying drawings in which: 
         FIG. 1  is a diagram of a scanned beam display capable of displaying a three-dimensional image in accordance with one or more embodiments; 
         FIG. 2  is a block diagram of the electronic circuits of a scanned beam display capable of displaying a three-dimensional image in accordance with one or more embodiments; 
         FIG. 3  is a diagram of a three-dimensional scanned beam display system including a display screen and glasses in accordance with one or more embodiments; 
         FIG. 4  is a diagram illustrating the generation of a monochrome image and a full color image in accordance with one or more embodiments; 
         FIG. 5  is a flow diagram of a method to generate a three-dimensional image in accordance with one or more embodiments; and 
         FIG. 6  is a block diagram of an information handling system utilizing a three-dimensional display projector in accordance with one or more embodiments. 
     
    
    
     It will be appreciated that for simplicity and/or clarity of illustration, elements illustrated in the figures have not necessarily been drawn to scale. For example, the dimensions of some of the elements may be exaggerated relative to other elements for clarity. Further, if considered appropriate, reference numerals have been repeated among the figures to indicate corresponding and/or analogous elements. 
     DETAILED DESCRIPTION 
     In the following detailed description, numerous specific details are set forth to provide a thorough understanding of claimed subject matter. However, it will be understood by those skilled in the art that claimed subject matter may be practiced without these specific details. In other instances, well-known methods, procedures, components and/or circuits have not been described in detail. 
     In the following description and/or claims, the terms coupled and/or connected, along with their derivatives, may be used. In particular embodiments, connected may be used to indicate that two or more elements are in direct physical and/or electrical contact with each other. Coupled may mean that two or more elements are in direct physical and/or electrical contact. However, coupled may also mean that two or more elements may not be in direct contact with each other, but yet may still cooperate and/or interact with each other. For example, “coupled” may mean that two or more elements do not contact each other but are indirectly joined together via another element or intermediate elements. Finally, the terms “on,” “overlying,” and “over” may be used in the following description and claims. “On,” “overlying,” and “over” may be used to indicate that two or more elements are in direct physical contact with each other. However, “over” may also mean that two or more elements are not in direct contact with each other. For example, “over” may mean that one element is above another element but not contact each other and may have another element or elements in between the two elements. Furthermore, the term “and/or” may mean “and”, it may mean “or”, it may mean “exclusive-or”, it may mean “one”, it may mean “some, but not all”, it may mean “neither”, and/or it may mean “both”, although the scope of claimed subject matter is not limited in this respect. In the following description and/or claims, the terms “comprise” and “include,” along with their derivatives, may be used and are intended as synonyms for each other. 
     Referring now to  FIG. 1 , a diagram of a scanned beam display in accordance with one or more embodiments will be discussed. Although  FIG. 1  illustrates one type of a scanned beam display system for purposes of discussion, for example a microelectromechanical system (MEMS) based display, it should be noted that other types of scanning displays including those that use two uniaxial scanners, rotating polygon scanners, or galvonometric scanners as well as systems that use the combination of a one-dimensional spatial light modulator with a single axis scanner as some of many examples, may also utilize the claimed subject matter and the scope of the claimed subject matter is not limited in this respect. Furthermore, projectors that are not scanned beam projectors but rather have two-dimensional modulators that introduce the image information in either the image plane or Fourier plane and which introduce color information time sequentially or using a filter mask on the modulator as some of many examples, may also utilize the claimed subject matter and the scope of the claimed subject matter is not limited in this respect. Scanned beam display  100  may be adapted to project a three-dimensional image as discussed herein. Details of operation of scanned beam display are discussed, below. 
     As shown in  FIG. 1 , scanned beam display  100  comprises a light source  110 , which may be a laser light source such as a laser or the like, capable of emitting a beam  112  which may comprise a laser beam. In some embodiments, light source may comprise two or more light sources, such as in a color system having red, green, and blue light sources, wherein the beams from the light sources may be combined into a single beam. In one or more embodiments, light source may include a first full color light source such as a red, green, and blue light source, and in addition may include a fourth light source to emit an invisible beam such as an ultraviolet beam or an infrared beam. The beam  112  is incident on a scanning platform  114  which may comprise a microelectromechanical system (MEMS) based scanner or the like in one or more embodiments, and reflects off of scanning mirror  116  to generate a controlled output beam  124 . In one or more alternative embodiments, scanning platform  114  may comprise a diffractive optic grating, a moving optic grating, a light valve, a rotating mirror, a spinning silicon device, a digital light projector device, a flying spot projector, or a liquid-crystal on silicon device, or other similar scanning or modulating devices. A horizontal drive circuit  118  and/or a vertical drive circuit  120  modulate the direction in which scanning mirror  116  is deflected to cause output beam  124  to generate a raster scan  126 , thereby creating a displayed image, for example on a display screen and/or image plane  128 . A display controller  122  controls horizontal drive circuit  118  and vertical drive circuit  120  by converting pixel information of the displayed image into laser modulation synchronous to the scanning platform  114  to write the image information as a displayed image based upon the position of the output beam  124  in raster pattern  126  and the corresponding intensity and/or color information at the corresponding pixel in the image. Display controller  122  may also control other various functions of scanned beam display  100 . 
     In one or more embodiments, for two dimensional scanning to generate a two dimensional image ultimately with a three-dimensional effect, a horizontal axis may refer to the horizontal direction of raster scan  126  and the vertical axis may refer to the vertical direction of raster scan  126 . Scanning mirror  116  may sweep the output beam  124  horizontally at a relatively higher frequency and also vertically at a relatively lower frequency. The result is a scanned trajectory of laser beam  124  to result in raster scan  126 . The fast and slow axes may also be interchanged such that the fast scan is in the vertical direction and the slow scan is in the horizontal direction. However, the scope of the claimed subject matter is not limited in these respects. 
     In one or more particular embodiments, the scanned beam display  100  as shown in and described with respect to  FIG. 1  may comprise a pico-projector developed by Microvision Inc., of Redmond, Wash., USA, referred to as PicoP™. In such embodiments, light source  110  of such a pico-projector may comprise one red, one green, one blue, and one invisible wavelength laser, with a lens near the output of the respective lasers that collects the light from the laser and provides a very low numerical aperture (NA) beam at the output. The light from the lasers may then be combined with dichroic elements into a single white beam  112 . Using a beam splitter and/or basic fold-mirror optics, the combined beam  112  may be relayed onto biaxial MEMS scanning mirror  116  disposed on scanning platform  114  that scans the output beam  124  in a raster pattern  126 . Modulating the lasers synchronously with the position of the scanned output beam  124  may create the projected image. In one or more embodiments the scanned beam display  100 , or engine, may be disposed in a single module known as an Integrated Photonics Module (IPM), which in some embodiments may be 7 millimeters (mm) in height and less than 5 cubic centimeters (cc) in total volume, although the scope of the claimed subject matter is not limited in these respects. 
     In one or more embodiments, the technology utilized for the red and blue lasers in scanned beam display  100  may be substantially similar to the technology of similar lasers that are used for the optical disk storage devices, with the main difference being a slight shift in the particular wavelengths provided by the lasers. Such lasers may be fabricated from materials such as gallium aluminum indium phosphide (GaAlInP) for red laser diodes and gallium nitride (GaN) for blue laser diodes. In one or more embodiments, the technology for green lasers may be based on infrared or near-infrared lasers developed for the telecom industry. Near-infra-red laser diodes with very high modulation bandwidths may be utilized in combination with a frequency-doubling crystal, for example periodically poled lithium niobate (LiNbO3), to produce a green laser that is capable of being directly modulated. The choice of which wavelength to use for the lasers is based at least in part on at least two considerations. First is the response of the human eye, known as the photopic response, to different wavelengths. This response is an approximate Gaussian curve that peaks at or near the green-wavelength region and falls off significantly in red and blue regions. The amount of red and blue power needed to get a white-balanced display may vary rapidly with wavelength. For example, eye response increases by a factor of two when the wavelength is changed from 650 nanometers (nm), the wave-length used for digital video disc (DVD) drives, to 635 nm. Such a change in wavelength allows the required laser power to drop by the same factor, thereby resulting in scanned beam display  100  that is able to operate at lower power. Similarly, the blue laser may be chosen to have as long a wavelength as possible. Currently, blue lasers in the range of 440 to 445 nm are typical, and eventually practical blue lasers having longer wavelengths in the range of 460 to 470 nm may be provided. The second consideration is color gamut. Since the photopic response is at or near peak value through the green wavelength range, the green wavelength may be chosen to enhance the color of the display. For example, green lasers at or near 530 nm may be utilized for maximizing or nearly maximizing the color gamut. Since the ability to directly modulate the lasers is a main feature of scanned beam display  100 , pixel times at or near the center of a Wide Video Graphics Array (WVGA) scanned display may be on the order of 20 nanoseconds (ns). As a result, the lasers may have modulation bandwidths on the order of about 100 MHz. It should be noted that these are merely examples for the types and characteristics of the lasers that may be utilized in scanned beam display  100 , and the scope of the claimed subject matter is not limited in these respects. In one or more embodiments, the fourth, invisible laser may comprise an ultraviolet (UV) laser having a wavelength of about 380 or 390 nm or so and may range as low as about 200 nm up to about 400 nm or so, and/or generally about 400 nm or less. Such a UV laser may comprise, for example, Gallium Aluminum Nitride (GaAlN) or Gallium Indium Nitride (GaInN), among many examples. In alternate embodiments, the fourth, invisible laser may comprise an infrared (IR) laser having a wavelength of about 850 nm or so and in general may have a wavelength of about 750 nm or greater such as about 750 nm to about 1550 nm or so. Such an IR laser may comprise, for example, aluminum gallium arsenide (AlGaAs), indium gallium arsenide phosphate (InGaAsP), a vertical cavity surface emitting laser (VCSEL), a quantum cascade laser, a hybrid silicon laser, and so on. The choice of the invisible laser is based on multiple considerations which include the efficiency of the laser wavelength for exciting the photoluminescent material in the screen, commercial availability of the laser, and/or laser safety. 
     In one or more embodiments of scanned beam display  100 , the remainder of the optics engine operates to generate a single pixel at a particular position of the output beam  124  in raster scan  126 . All three lasers may be driven simultaneously at levels to create a proper color mix for each pixel to produce brilliant images with the wide color gamut available from red, green, blue (RGB) lasers in addition to the invisible wavelength laser. Direct-driving of the lasers pixel-by-pixel at or near the levels involved for each pixel provides suitable power efficiency and inherently high contrast. As a result, in such embodiments the efficiency of scanned beam display may be maximized or nearly maximized since the lasers may be only on at the level needed for each pixel. The contrast may be high because the lasers are completely off for black pixels rather than using, for example, a spatial light modulator (SLM) to deflect or absorb any excess intensity. The single-pixel collection optics may be optimized to take the particular beam properties of the red, green, and/or blue laser and relay it through the scanned beam display and onto the display screen  128  with high efficiency and/or image quality. The pixel profile may be designed to provide high resolution and infinite focus with a smooth non-pixelated image. In some embodiments, with a relatively simple optomechanical design for scanned beam display  100 , at least some of the display complexity may be handled by the electronics systems to control accurate placement of pixels and to modulate the laser at pixel rates. 
     In one or more embodiments of a raster-scanned beam display  100 , no projection lens may be utilized or otherwise needed. In such embodiments, the projected output beam  124  directly leaves the scanned beam display  100  and creates an image on whatever display screen  128  upon which output beam  124  is projected. Because of the scanned single pixel design, light-collection efficiency may be kept high by placing the collection lenses near the output of the lasers while the NA of output beam  124  is very low. By design, the rate of expansion of the single-pixel beam may be matched to the rate that the scanned image size grows. As a result, the projected image is always in focus. This special property of scanned beam display  100  comes from dividing the task of projecting an image into using a low NA single-pixel beam to establish the focus and a two-dimensional (2D) scanner to paint the image. In particular embodiments, the scanning platform  114  may implement the role of fast projection optics by producing an image that expands with a 43° horizontal projection angle. Such an arrangement may not be achieved in more traditional projector designs where projection optics may be used to image a spatial light modulator onto the projection screen due to conflicting constraints on the projection lens. On the one hand, a short focal length lens may be utilized to create an image that grows quickly with projection distance, while on the other hand, the lens aperture is typically large to maximize the projector&#39;s brightness. Such constraints may involve a fast projection lens with F/2 lenses being typical. Depth of focus is proportional to F-stop. The trade-off for traditional projector designs balances the rate the image grows with distance, light efficiency and/or depth of focus. 
     In some embodiments of scanned beam display  100 , the spot size as a function of projection distance may grow at a rate matched or close to the growth of a single pixel. Assuming a moderately fast F/4 projection lens and a focal length chosen to give the same 43° rate or growth with projection distance for the projected image, the depth of locus for an imaging-type projector is greatly reduced compared to the scanned laser. To the user, this means that the typical imaging-type projector should be refocused as the projection distance is changed, and that portions of the image may be out of focus when one projects onto surfaces that present a range of projection distances within the image, for example projecting onto a flat surface at an angle or onto surfaces with a significant three-dimensional (3D) profile. 
     Referring now to  FIG. 2 , a block diagram of the electronic circuits of a scanned beam display in accordance with one or more embodiments will be discussed. With the simplification of the optomechanical projector engine design, a greater portion of the display emphasis may be shifted to the electronics. This allows the physical size of the projector engine to be relatively minimized to accommodate hand-held consumer products. The electronics, which can be integrated more straight-forwardly into consumer products, take over tasks that are done optically with other projector designs. Some of the tasks that are shifted include pixel positioning, color alignment and brightness uniformity. In some embodiments of scanned beam display  100 , the video processor and controller  122  for scanning platform  114  may be implemented as one or more custom application-specific integrated circuits (ASICs) that drive the scanned beam display  100  of  FIG. 1 . 
     In one or more embodiments, such an electronics system  200  may comprise scan drive ASIC  216  which may comprise horizontal drive circuit  118  and vertical drive circuit  120  as shown in  FIG. 1  for driving scanning platform  114  to generate a raster scan  126 . In some embodiments, scan drive ASIC  218  may drive scanning platform  114  under closed loop control. The horizontal scan motion may be created by driving the horizontal axis of scanning platform  114  at its resonant frequency which typically may be about 18 kHz for a Wide Video Graphics Array (WVGA) type scanner. The horizontal scan velocity may vary sinusoidally with position. In particular embodiments, scan drive ASIC  216  may utilize feedback from sensors on scanning platform  114  to keep the system on resonance and/or at fixed scan amplitude. The projected image is drawn in both directions as scanning platform  114  sweeps the beam back and forth. Such an arrangement may increase the efficiency of scanning platform  114  in at least two ways. First, by running on resonance the power required to drive the scan mirror may be reduced and/or minimized. However, in some embodiments scanning platform  114  may be non-resonantly driven. Second, bi-directional video increases and/or maximizes the laser use efficiency by minimizing the video blanking interval. As a result, the image projected by scanned beam display  100  may be brighter for a given power output of the four lasers  110 , although the scope of the claimed subject matter is not limited in these respects. In some embodiments, the vertical scan direction may be driven with a standard sawtooth waveform to provide constant velocity from the top to the bottom of the image and a rapid retrace back to the top to begin a new frame. The vertical scan motion also may be managed in closed loop fashion by scan drive ASIC  216  based at least in part on position feedback from scanning platform  114  to maintain a smooth and/or linear trajectory. The frame rate typically may be 60 Hz for an 848×480 WVGA resolution. The frame rate may be increased if the projector is used in lower resolution applications, although the scope of the claimed subject matter is not limited in this respect. Further details of the scan drive waveforms are shown in and described with respect to  FIG. 3 , below. 
     In one or more embodiments, controller  122  of  FIG. 1  may comprise a video ASIC  214  as shown in  FIG. 2  as an embodiment of controller  122 . In some embodiments, video ASIC  214  accepts either red, green, blue (RGB) and/or luma/chrominance (YUV) video signal inputs, in addition to a monochrome signal for the invisible wavelength laser. Video ASIC  214  may include a frame buffer memory  210  to allow artifact free scan conversion of input video. Gamma correction and/or color space conversion may be applied to enable accurate mapping of input colors to the wide laser color gamut. An optional scaling engine may be provided for upconverting lower resolution video content. In one or more embodiments, video ASIC  214  may implement a Virtual Pixel Synthesis (VPS) engine that utilizes high-resolution interpolation to map the input pixels to the sinusoidal horizontal trajectory of scanning platform  114 . Such a VPS engine is an example of how functions of scanned beam display  100  may be shifted from being implemented in optics to being implemented electronics by electronics system  200  in a scanned laser paradigm. The VPS engine effectively may map the input pixels onto a high-resolution virtual coordinate grid. Besides enabling the repositioning of video information with subpixel accuracy onto the sinusoidal scan, the VPS engine may further optimize the quality of the projected image. Brightness uniformity also may be managed in the VPS engine by adjusting coefficients that control the overall brightness map for the scanned beam display  100 . 
     In one or more embodiments, the VPS engine implemented by video ASIC  214  may compensate optical distortions, for example keystone, parallelogram, and/or some types of pincushion distortion, and/or any arbitrary or intentional type of distortion including but not limited to distortion from varying surface profile or relief, wherein the VPS engine may be utilized to adjust the pixel positions. The VPS engine also may allow the pixel positions for each color to be adjusted independently. Such an arrangement may simplify the manufacturing alignment of scanned beam display  100  by relaxing the requirement that the three laser beams of laser  110  be perfectly mechanically aligned. The positions of the red, green, blue, and/or invisible light pixels may be adjusted electronically to bring the video into perfect, or nearly perfect, alignment, even if the laser beams are not themselves sufficiently aligned. Such an electronic pixel alignment capability also may be utilized to compensate for some types of chromatic aberration if scanned beam display  100  is deployed as an engine in a larger optical system, although the scope of the claimed subject matter is not limited in this respect. In some embodiments, mapping from digital video coding performed by video ASIC  214  to laser drive ASIC  220  may be performed by an Adaptive Laser Drive (ALD) system implemented by system controller and software  212 . In some embodiments, the ALD may comprise a closed-loop system that utilizes optical feedback from each laser to actively compensate for changes in the laser characteristics over temperature and/or aging. Such an arrangement may ensure optimum, or nearly optimum, brightness, color and/or grayscale performance. Unlike other display systems, optical feedback further may be incorporated to ensure optimum color balance and/or grayscale. Other electronic blocks in electronics system  200  may include safety subsystem  218  to maintain the output power of lasers  100  within safe levels, and/or beam shaping optics and combiner  222  to shape and/or combine the beams from individual lasers  110  into a single beam applied to scanning platform  114 . However,  FIG. 2  shows one example arrangement of electronics system  200  of a scanned beam display, and the scope of the claimed subject matter is not limited in these respects. 
     In one or more embodiments, the components of scanned beam display  100  and/or components of electronics system  200  may be arranged for operation in a mobile format or environment. Such an example scanned beam display  100  may include the following specifications. The height or thickness and/or volume of scanned beam display  100  may be minimized or nearly minimized, for example a height from about 7 to 14 mm and in overall volume from 5 to 10 cubic centimeters (cc). Brightness may be affected by the available brightness of the light sources, either lasers or light emitting diodes (LEDs), the optical efficiency of the projector design, and/or lower-power operation in order to maximize battery life. In some embodiments, the brightness of the image projected by scanned beam display may be in the range of about 5 to 10 lumens. For image size, a projection angle in the range of 30 to 45 degrees may be utilized and in one or more particular embodiments the projection angle may be about 53 degrees with a one-to-one (1:1) distance to image size ratio, although the scope of the claimed subject matter is not limited in these respects. For mobile applications, scanned beam display  100  may provide focus free operation wherein the distance from the display to the displayed image will likely change often. The wide screen format generally may be desirable for viewing video content wherein scanned beam display  100  may provide resolutions from quarter video graphics array (QVGA) comprising 320×240 pixels to wide video graphics array (WVGA) comprising 848×480 pixels, as merely some examples. In some embodiments, scanned beam display  100  typically utilizes either color lasers and/or red, green, blue, and invisible wavelength LEDs for light sources. In both embodiments, the result is large color gamuts that far exceed the usual color range typically provided televisions, monitors, and/or conference-room-type projectors. In some embodiments, white LEDs may be utilized used with color filters to yield a reduced color gamut. Contrast likewise may be maximized, or nearly maximized. Contrast may be referred to as the dynamic range of scanned beam display  100 . In one or more embodiments, a target specification for power consumption may be to provide a battery life sufficient to watch an entire movie, which may be at least about 1.5 hours. It should be noted that these are merely example design specifications for scanned beam display  100 , and the scope of the claimed subject matter is not limited in these respects. 
     Referring now to  FIG. 3 , diagram of a three-dimensional scanned beam display system including a display screen and glasses in accordance with one or more embodiments will be discussed.  FIG. 3  shows a complete or nearly complete system  300  for generating a three-dimensional image using lasers to generate the image as discussed herein. In system  300 , the scanned beam display  100  may comprise an invisible laser  310  to generate a monochrome image in addition to three visible light lasers such as green laser  312 , red laser  314 , and blue laser  316  to generate a full color image. The invisible wavelength laser beam  318  emitted by invisible wavelength laser  310  may be projected onto a first reflector  328  to be combined with the green laser beam  320 , red laser beam  324 , and blue laser beam  326  via corresponding beam combiners  330 ,  332 , and  334  to provide a composite beam  112  that may be optionally shaped and/or combined using optics in block  222  and redirected to scanning platform  114  which generates a projected image on display screen  128  via a raster scan. In one or more embodiments, display screen may be coated and/or contain an appropriate Photoluminescent material  336  that is responsive to the invisible light beam  318  component of composite beam  112 . The Photoluminescent material  336  which re-radiates the invisible light into a color in the visible spectrum. In one or more embodiments, the re-radiated light is at a color having a higher photopic response, for example yellow or near yellow light. For example, where the invisible laser comprises a UV laser, Photoluminescent material  336  may comprise a yellow emitting UV phosphor such as a coumarin phosphor, a pyrromethene phosphor, and/or a zinc selenide, among many examples. Where the invisible laser  310  is an infrared laser, Photoluminescent material  336  may comprise a yellow emitting IR phosphor. In particular embodiments, the Photoluminescent material may be selected to have a higher efficiency such that the ratio of the power of the re-radiated beam to the power of the input invisible beam is relatively high. The resulting image re-radiated from Photoluminescent material  336  may be a monochrome image in the visible light spectrum such as a yellow or near yellow monochrome image. This monochrome image may be viewed along with the full color image, for example RGB, by a viewer who is looking at display screen  128 . Using known techniques, the two images comprising the monochrome image and the color image may be slightly offset at desired portions of the image in order to produce the desired three-dimensional effect. In order to view the image as a three-dimensional image, a pair of viewing glasses  338  may be utilized. Glasses  338  may include a first lens  340  having a first filter F 1  and a second lens  342  having a second filter F 2 . The operation of glasses  338  is shown in and described with respect to  FIG. 4 , below. 
     Referring now to  FIG. 4 , a diagram illustrating the generation of a monochrome image and a full color image in accordance with one or more embodiments will be discussed. The viewer may utilize glasses  338  to view the projected image with a three-dimensional effect. The first filter F 1  of lens  340  may be designed to pass the visible monochrome image  410  re-radiated from projection screen  128  via rays  414  to one of the viewer&#39;s eye while blocking the full color image reflected off projection screen  128  via rays  416 . Likewise, the second filter F 2  of lens  342  may be designed to pass the full color image  412  reflected off projection screen  128  to the viewer&#39;s other eye while blocking the monochrome image re-radiated off the projection screen  128 . For example, the first filter F 1  may be a band-pass filter at or near the wavelength of the monochrome image (i.e., the wavelength of the visible light that is re-radiated by the Photoluminescent material  336 ), and the second filter F 2  may comprise a band-reject filter, or notch filter, at or near the wavelength of the monochrome image. Other types of filters likewise may be utilized, and the scope of the claimed subject matter is not limited in this respect. Furthermore, although in one or more embodiments, monochrome image  410  and full color image  412  may be generated by a single display projector and/or projector module, in one or more alternative embodiments multiple projectors and/or projector modules may be utilized wherein the multiple projectors and/or projector modules may work together to generate a three-dimensional image. For example, monochrome image  410  may be generated by a first projector and/or projector module, and full color image  412  may be generated by a second projector and/or projector module. However, this is merely one example of how multiple projectors and/or projector modules may be utilized, and the scope of the claimed subject matter is not limited in this respect. 
     Referring now to  FIG. 5 , a flow diagram of a method to generate a three-dimensional image in accordance with one or more embodiments will be discussed. Method  500  shows one particular method for generating a three-dimensional image in accordance with one or more embodiments; however alternative methods may likewise be utilized without departing from the scope of the claimed subject matter. For example, the method  500  may include more or fewer blocks than shown in  FIG. 5 , and/or the blocks may be arranged in other orders, and the scope of the claimed subject matter is not limited in these respects. At block  510 , display  100  may project a full color image using three visible light lasers or other light sources. Display  100  may also project a monochrome image using a fourth invisible light laser or other invisible light source at block  512 . The full color image  412  may be reflected off display screen  128  at block  514  as visible light rays  416  toward a viewer. The invisible monochrome image may impinge on Photoluminescent material  336  of display screen  128  and may be re-radiated via photoluminescence at block  516  as a visible monochrome image in the visible light spectrum. The viewer may be wearing a pair of glasses  338  having a lens  340  for a first eye having a filter F 1  that rejects the color image  412  and passes the visible monochrome image  410  to the first eye at block  518 . The pair of glasses  338  also has a lens  342  for a second eye having a filter F 2  that rejects the visible monochrome  410  image and passes the full color image  412  to the second eye at block  520 . By driving the electronics  200  and scanning platform  114  appropriately, a three-dimensional image may be viewed by the user. 
     Referring now to  FIG. 6 , a block diagram of an information handling system utilizing a three-dimensional display projector in accordance with one or more embodiments will be discussed. Information handling system  600  of  FIG. 6  may tangibly embody scanned beam display  100  as shown in and described with respect to  FIG. 1 . Although information handling system  600  represents one example of several types of computing platforms, including cell phones, personal digital assistants (PDAs), netbooks, notebooks, internet browsing devices, and so on, information handling system  600  may include more or fewer elements and/or different arrangements of the elements than shown in  FIG. 6 , and the scope of the claimed subject matter is not limited in these respects. 
     Information handling system  600  may comprise one or more processors such as processor  610  and/or processor  612 , which may comprise one or more processing cores. One or more of processor  610  and/or processor  612  may couple to one or more memories  616  and/or  618  via memory bridge  614 , which may be disposed external to processors  610  and/or  612 , or alternatively at least partially disposed within one or more of processors  610  and/or  612 . Memory  616  and/or memory  618  may comprise various types of semiconductor based memory, for example volatile type memory and/or non-volatile type memory. Memory bridge  614  may couple to a video/graphics system  620  to drive a display device, which may comprise projector  636 , coupled to information handling system  600 . Projector  636  may comprise scanned beam display  100  of  FIG. 1  and/or complete system  300  of  FIG. 3 . In one or more embodiments, video/graphics system  620  may couple to one or more of processors  610  and/or  612  and may be disposed on the same core as the processor  610  and/or  612 , although the scope of the claimed subject matter is not limited in this respect. 
     Information handling system  600  may further comprise input/output (I/O) bridge  622  to couple to various types of I/O systems. I/O system  624  may comprise, for example, a universal serial bus (USB) type system, an IEEE 1394 type system, or the like, to couple one or more peripheral devices to information handling system  600 . Bus system  626  may comprise one or more bus systems such as a peripheral component interconnect (PCI) express type bus or the like, to connect one or more peripheral devices to information handling system  600 . A hard disk drive (HDD) controller system  628  may couple one or more hard disk drives or the like to information handling system, for example Serial Advanced Technology Attachment (Serial ATA) type drives or the like, or alternatively a semiconductor based drive comprising flash memory, phase change, and/or chalcogenide type memory or the like. Switch  630  may be utilized to couple one or more switched devices to I/O bridge  622 , for example Gigabit Ethernet type devices or the like. Furthermore, as shown in  FIG. 6 , information handling system  600  may include a baseband and radio-frequency (RF) block  632  comprising a base band processor and/or RF circuits and devices for wireless communication with other wireless communication devices and/or via wireless networks via antenna  634 , although the scope of the claimed subject matter is not limited in these respects. 
     In one or more embodiments, information handling system  600  may include a projector  636  that may correspond to scanning platform  114  of  FIG. 1  and/or system  300  of  FIG. 3 , and which may include any one or more or all of the components of scanned laser display  100  such as processor  122 , horizontal drive circuit  118 , vertical drive circuit  120 , and/or laser source  110 . In one or more embodiments, projector  636  may be controlled by one or more of processors  610  and/or  612  to implements some or all of the functions of controller  122  of  FIG. 1 . In one or more embodiments, projector  636  may comprise a MEMS based scanned laser display for displaying an image projected by projector  636  where the image may likewise be represented by target/display  640 . In one or more embodiments, a scanned beam projector may comprise video/graphics block  620  having a video controller to provide video information  638  to projector  636  to display an image represented by target/display  640 . In one or more embodiments, projector  636  may be capable of generating a three-dimensional image on display  640  as discussed herein. However, these are merely example implementations for projector  636  within information handling system  600 , and the scope of the claimed subject matter is not limited in these respects. 
     Although the claimed subject matter has been described with a certain degree of particularity, it should be recognized that elements thereof may be altered by persons skilled in the art without departing from the spirit and/or scope of claimed subject matter. It is believed that the subject matter pertaining to a three-dimensional display using an invisible wavelength light source and/or many of its attendant utilities will be understood by the forgoing description, and it will be apparent that various changes may be made in the form, construction and/or arrangement of the components thereof without departing from the scope and/or spirit of the claimed subject matter or without sacrificing all of its material advantages, the form herein before described being merely an explanatory embodiment thereof, and/or further without providing substantial change thereto. It is the intention of the claims to encompass and/or include such changes.